Suturing instruments

TECHNICAL FIELD

0001The invention relates to medical devices and, more specifically, to devices for approximation, ligation, or fixation of tissue using sutures.

BACKGROUND INFORMATION

0002Suturing of body tissue is a time consuming aspect of many surgical procedures. For many surgical procedures, it is necessary to make a large opening in the human body to expose the area that requires surgical repair. There are instruments available that allow for viewing of certain areas of the human body through a small puncture wound without exposing the entire body cavity. These instruments, called endoscopes, can be used in conjunction with specialized surgical instruments to detect, diagnose, and repair areas of the body that previously required open surgery to access.

0003Some surgical instruments used in endoscopic procedures are limited by the manner in which they access the areas of the human body in need of repair. In particular, the instruments may not be able to access tissue or organs located deep within the body or that are in some way obstructed. Also, many of the instruments are limited by the way they grasp tissue, apply a suture, or recapture the needle and suture. Furthermore, many of the instruments are complicated and expensive to use due to the numerous parts and/or subassemblies required to make them function properly.

0004Suturing instruments, and more specifically suturing instruments used in endoscopic procedures, are generally rigid and do not provide the operator a range of motion to access difficult to reach parts of the anatomical region requiring sutures. Accordingly, multiple instruments of various configurations and sizes must be used to access all of the necessary tissue areas. These limitations of suturing instruments complicate the endoscopic procedure for the surgeon by requiring the insertion and removal of multiple instruments from a surgical site as the target suturing area changes during the course of the surgical procedure.

0005Many medical procedures require that multiple sutures be placed within a patient. Typical suturing instruments enable a surgeon to place only one suture at a time. With such suturing instruments, the surgeon is required to remove the instrument from a surgical site and reload the instrument between placing each suture. Further, the surgeon may be required to use forceps or other instruments to help place the suture. In some instances, the forceps or other instruments may require an additional incision to access the surgical site.

0006Thus, suturing remains a delicate and time-consuming aspect of most surgeries, including those performed endoscopically. Accordingly, there is an unresolved need in the art to provide a suturing instrument with improved maneuverability, efficiency, and functionality during a surgical procedure.

SUMMARY OF THE INVENTION

0007The invention generally relates to surgical instruments for performing a surgical procedure, such as placing one or more sutures through tissue. The suturing instruments disclosed herein are dimensioned and configured to apply sutures to approximate, ligate, or fixate tissues in, for example, open, mini-incision, trans-vaginal, laparoscopic, or endoscopic surgical procedures.

0008More particularly, the invention is directed to suturing instruments that include a distal portion that is deflectably and/or pivotally coupled to the remainder of the instrument for improved maneuverability and functionality during surgery

0009In general, the invention features a suturing instrument that includes an elongate body member having a middle portion and a distal portion. The distal portion extends distally from the middle portion and is deflectable at a predetermined angle relative to the middle portion. Suturing instruments showing these features are already known from the documents <patcit id="pcit0001" dnum="WO9609796A2"><text>WO 96/09796 A2</text></patcit> and <patcit id="pcit0002" dnum="WO9212674A1"><text>WO 92/12674 A1</text></patcit>. The predetermined angle of deflection of the distal portion may range from about -90° to about 90°. The suturing instrument also includes a needle deployment mechanism disposed at least partially within the elongate body member. The needle deployment mechanism is connectable to a needle for moving the needle out of the distal portion of the elongate body member.

0010In one embodiment according to the invention, the elongate member also includes at least one tension member that is slidably disposed at least partially in the elongate member and is connected to its distal portion. In this embodiment, the suturing instrument may include at least one deflection control member coupled to the tension member and disposed opposite the distal portion of the elongate body member for controlling deflection of the distal portion.

0011In another embodiment according to the invention, the distal portion is pivotable about a first axis that is perpendicular to the longitudinal axis of the elongate body member. In this embodiment, the suturing instrument may include a first pivot control lever disposed opposite the distal portion of the elongate body member, and a pivot wire rotatably disposed in the elongate body member and coupled to the distal portion. The first pivot control lever may be coupled to the pivot wire for controlling pivoting of the distal portion.

0012According to the invention, the distal portion includes a first beveled surface for contacting the middle portion and the middle portion includes a second beveled surface for contacting the distal portion. According to one feature of this embodiment, a first angle defined by the first beveled surface and a second angle defined the second beveled surface are substantially equal. The sum of the angles may substantially equal 90°. According to another feature, the elongate body member includes a first resilient member for biasing the distal portion towards the middle portion along a longitudinal axis of the elongate member. The suturing instrument of this embodiment may also include a deflection control mechanism coupled to the distal portion for deflecting the distal portion at the predetermined angle relative to the middle portion by rotating the distal portion about a longitudinal axis of the elongate body member.

0013According to the invention, the elongate body member includes a locking mechanism for securing the distal portion at the predetermined angle relative to the middle portion. The locking mechanism includes a plurality of detents that are defined by the first beveled surface and are circumferentially disposed about the first beveled surface; and a ball disposed in the second beveled surface and dimensioned to fit at least one of the plurality of detents. In this feature, the second beveled surface may define an aperture for receiving the ball therein. Also, a second resilient member may be disposed in the aperture for biasing the ball into engagement with the at least one of the plurality of detents.

0014In yet another embodiment according to the invention, the needle deployment mechanism includes a needle carrier that is disposed at least partially within the distal portion of the elongate body member and is slidably movable out of the distal portion. The needle deployment mechanism optionally includes an actuator coupled to the needle carrier and disposed opposite the distal portion. The actuator may be at least partially housed by a handle disposed opposite the distal portion.

0015In general, in a second aspect, the invention features a suturing instrument that includes an elongate body member having a longitudinal axis. The elongate body member has a distal portion that is pivotable about at least one axis that is substantially perpendicular to the longitudinal axis of the elongate body member. The suturing instrument also includes a needle deployment mechanism disposed at least partially within the elongate body member. The needle deployment mechanism is connectable to a needle for moving the needle out of the distal portion. Also, the elongate body member may include a handle disposed opposite the distal portion.

0016In one embodiment according to the second aspect of the invention, the suturing instrument also includes a pivot control lever disposed opposite the distal portion of the elongate body member for controlling pivoting of the distal portion. In a first version of this embodiment, the suturing instrument includes a pivot mechanism disposed in the elongate body member and coupled to the distal portion. The pivot control lever may be coupled to the pivot mechanism for controlling pivoting of the distal portion. In a second version of this embodiment, the elongate body member may include an inner portion coupled to the distal portion, and an outer portion coupled to the pivot control lever and slidably disposed at least partially along the inner portion. According to one feature, the suturing instrument also has a linkage coupled to the outer portion and the distal portion. The linkage is configured to cause the distal portion to pivot about the first axis when the outer portion is displaced relative to the inner portion. According to another feature, the suturing instrument also includes a resilient member for biasing the outer portion towards the proximal portion of the elongate body member.

0017Further, in various features of the needle deployment mechanism of this embodiment of the suturing instrument, the needle deployment mechanism includes a needle carrier that is disposed at least partially within the distal portion of the elongate body member and is slidably movable out of the distal portion.

0018According to one particular feature of the second version of this embodiment, the needle deployment mechanism also has a resilient loop of material disposed at least partially within the elongate body member and coupled to the needle carrier. The needle deployment mechanism also includes an actuator that is coupled to the needle carrier via the resilient loop of material to move the needle carrier of the distal portion. The actuator may be at least partially housed by the handle.

0019According to another feature, the needle deployment mechanism also includes a needle carrier control rod that is slidably disposed at least partially within the elongate body member and coupled to the needle carrier. The needle carrier control rod may optionally be made of a superelastic material, such as a nickel-titanium alloy. The needle carrier control rod is configured to move the needle carrier when the needle carrier control rod is slidably advanced. The needle deployment mechanism may include an actuator coupled to the needle carrier control rod to advance the needle carrier control rod. The actuator is disposed opposite the distal portion of the elongate member, for example, at least partially housed by the handle.

0020According to yet another feature of the second version of this embodiment, the needle deployment mechanism also includes a camshaft disposed within the distal portion of the elongate body member and coupled to the needle carrier and a drum rotatably disposed within the distal portion of the elongate body member and coupled to the camshaft for moving the camshaft when the drum rotates. The needle deployment mechanism according to this feature further includes a push wire slidably disposed within the elongate body member and having a distal end coupled to the drum for causing the drum to rotate. The needle deployment mechanism may also include an actuator coupled to a proximal end of the push wire for advancing the push wire. The actuator is disposed opposite the distal portion of the elongate member, for example, at least partially housed by the handle.

0021In another embodiment according to the second aspect of the invention, the distal portion of the suturing instrument includes a first gear that is rotatable about a first axis substantially perpendicular to the longitudinal axis of the elongate body member. According to one feature of this embodiment, a middle portion of the elongate body member includes a second gear rotatable about the longitudinal axis and meshed with the first gear. According to this feature, the distal portion pivots about the first axis when the second gear rotates about the longitudinal axis. Optionally, the suturing instrument includes a pivot control mechanism disposed at least partially within the middle portion and coupled to the second gear for causing the second gear to rotate about the longitudinal axis, a pivot control lever disposed opposite the distal portion of the elongate body member and coupled to the pivot control mechanism for controlling pivoting of the distal portion.

0022In yet another embodiment according to the second aspect of the invention, the distal portion is rotatable about the longitudinal axis of the elongate body member. In this embodiment, the suturing instrument may include a rotation control mechanism disposed opposite the distal portion of the elongate body member, and a rotation rod rotatably disposed in the elongate body member and coupled to the distal portion. The rotation control mechanism may be coupled to the rotation rod for controlling rotation of the distal portion. this aspect of the invention also includes a needle deployment mechanism disposed at least partially within the elongate body member and connectable to a needle for moving the needle out of the distal portion.

0023In one embodiment according to the third aspect of the invention, the needle deployment mechanism includes a needle carrier that is disposed at least partially within the distal portion of the elongate body member and is slidably movable out of the distal portion; a carrier drive wire slidably disposed within a lumen defined by the flexible tubular member and coupled to the needle carrier; and an actuator coupled to the carrier drive wire. According to one feature of this embodiment, the elongate body member may include a proximal portion including a handle at least partially housing the actuator. The tubular member may be releasably attached to the proximal portion. Optionally, the distal portion is rotatable about a longitudinal axis of the elongate body member relative to the proximal portion. The suturing instrument may also include a rotation control mechanism disposed in the proximal portion of the elongate body member for controlling rotation of the distal portion. Also, according to this feature, the proximal portion includes a carrier drive wire socket releasably coupled to the proximal portion for receiving the carrier drive wire. The proximal portion may also include a locking socket that is rotationally and releasably coupled to the carrier drive wire socket and serves to secure a proximal end of the tubular member. Further, the proximal portion may also include a scope adapter for securing the proximal portion to the working channel of the endoscope.

0024In another embodiment according to the third aspect of the invention, the distal portion of the elongate body member is pivotable about a first axis, which is substantially perpendicular to a longitudinal axis of the elongate body member.

0025Also, the invention features a method for placing sutures in tissue. The method includes the step of providing an endoscope defining a working channel through. The working channel of the endoscope has an opening at a distal end of the endoscope. The method further includes the step of providing a suturing instrument that includes an elongate body member having a flexible tubular member with a distal end and a proximal end; the flexible tubular member dimensioned to slidably and rotationally fit within the working channel of the endoscope, and a distal portion attached to the distal end of the flexible tubular member. The suturing instrument also includes a needle deployment mechanism disposed at least partially within the elongate body member and connectable to a needle for moving the needle out of the distal portion. The method also includes the steps of inserting the proximal end of the flexible

0026In various embodiments according to the foregoing aspects of the invention, the suturing instrument includes a needle disposed within the distal portion. Also, the distal portion of the suturing instrument of claim may include a needle catch configured to receive a needle, the needle catch defining a retention slot including at least two flexible edges.

0027In general, in a another aspect, the invention features a suturing instrument that includes an elongate body member having a distal portion. The distal portion includes a needle catch defining an aperture. The suturing instrument according to this aspect of the invention includes a needle deployment mechanism disposed at least partially within the elongate body member for moving a needle out of the distal portion and to the needle catch as well as a needle reloading mechanism disposed at least partially within the elongate body member for pushing the needle into the aperture of the needle catch. The needle catch is optionally slidably movable along a longitudinal axis of the elongate body member.

0028In one embodiment according to this aspect of the invention, the needle deployment mechanism includes a needle carrier that is disposed at least partially within the distal portion of the elongate body member and is slidably movable out of the distal portion. The needle deployment mechanism also includes an actuator that is coupled to the needle carrier and disposed opposite the distal portion of the elongate body member. The needle carrier has a distal end that, optionally, defines a lumen for receiving the needle therein.

0029In another embodiment according to this aspect of the invention, the needle reloading mechanism includes a pusher rod and a rod actuator for moving the pusher rod towards the distal portion of the elongate body member. According to one feature of this embodiment, the rod actuator is disposed opposite the distal portion of the elongate body member substantially perpendicularly to the pusher rod. According to another feature, the pusher rod comprises a substantially concave distal end. Also, according to yet another feature, the needle reloading mechanism has a hook coupled to a resilient member for biasing the pusher rod away from the distal portion of the elongate body member.

0030In still another embodiment according to this aspect of the invention, the needle catch defines a retention slot including at least two flexible edges for retaining the needle therein, the retention slot in communication with the aperture. At least one of the flexible edges may have at least one protrusion extending into the retention slot. According to another feature of this embodiment, the suturing instrument includes a needle disposed within the distal portion. The needle has a suture attached thereto and is releasable from the needle catch by pulling on the free end of the suture after the needle reloading mechanism pushes the needle into the aperture.

0031In yet another embodiment according to this aspect of the invention, the suturing instrument also includes a handle disposed opposite the distal portion of the elongate body member, which at least partially houses the needle deployment mechanism and the needle reloading mechanism.

0032In general, in another aspect, the invention features a suturing instrument that includes an elongate body member having a distal portion. The distal portion includes a first operative portion and a second operative portion. The suturing instrument also includes a needle deployment mechanism that is disposed at least partially within the elongate body member and includes a first needle carrier disposed at least partially within the first operative portion and connectable to a first needle for moving the first needle out of the first operative portion, and a second needle carrier disposed at least partially within the second operative portion and connectable to a second needle for moving the second needle out of the second operative portion.

0033In a first embodiment according to this aspect of the invention, the suturing instrument includes a handle that is disposed opposite the distal portion of the elongate body member and at least partially houses the needle deployment mechanism.

0034In a second embodiment according to this aspect of the invention, the first operative portion and the second operative portion of the distal portion form a unitary operative portion.

0035In a third embodiment according to this aspect of the invention, the suturing instrument includes an actuator coupled to the first needle carrier and the second needle carrier and disposed opposite the distal portion of the elongate body member. According to one feature of this embodiment, the actuator includes a first sub-actuator coupled to the first needle carrier and a second sub-actuator coupled to the second needle carrier. The first needle carrier and the second needle carrier are actuatable either sequentially or simultaneously.

0036In a fourth embodiment according to this aspect of the invention, the suturing instrument includes a first needle disposed within the first operative portion, and a second needle disposed within the second operative portion. According to one feature of this embodiment of the suturing instrument, a first suture is attached to the first needle and a second suture is attached to the second needle. According to another feature of this embodiment, the suturing instrument includes a suture having a first end attached to the first needle and a second end attached to the second needle.

0037In a fifth embodiment according to this aspect of the invention, the distal portion of the suturing instrument includes a first needle catch configured to receive a first needle; and a second needle catch configured to receive a second needle. Optionally, the first needle catch and the second needle catch form a unitary needle catch. At least one of the first needle catch and the second needle catch may define a retention slot including at least two flexible edges.

0038In a sixth embodiment according to this aspect of the invention, the first operative portion of the distal portion defines a first needle port and the second operative portion of the distal portion defines a second needle port. In this embodiment, the distance between the first needle exit port and second needle exit port is laterally adjustable by deflecting at least one of the first operative portion and the second operative portion outwardly from the elongate body member. According to one feature of this embodiment, the suturing instrument includes a deflecting mechanism for adjusting the distance between the first needle exit port and the second needle exit port. A deflection actuator disposed opposite the distal portion of the elongate body member may be included for actuating the deflecting mechanism. The deflecting mechanism may include, for example, a wedge, a cam, an elbow linkage, a rotational separator, and a track-and-follower assembly. the distal portion. Also, the distal portion of the elongate body member is optionally rotatable relative to a remainder of the elongate body member.

0039Further, in one embodiment of the sixth aspect of the invention, the needle deployment mechanism includes a needle carrier that is disposed at least partially within the distal portion of the elongate body member and is slidably movable out of the distal portion and an actuator coupled to the needle carrier and disposed opposite the distal portion of the elongate body member.

0040In another embodiment of the sixth aspect of the invention, the cartridge defines an exit aperture for receiving at least one of the first needle and the second needle. According to one feature of this embodiment, the cartridge further defines a loading slot connected to the exit aperture. At least of the first needle and the second needle can be received in the loading slot. The second needle transitions from the needle loading slot to the exit aperture after the first needle is deployed from the cartridge. In one version of this feature, the suturing instrument includes a pusher for transitioning the second needle from the needle loading slot to the exit aperture after the first needle is deployed from the cartridge through the opening. Optionally, the pusher includes a push plate for contacting the second needle and a resilient member for biasing the push plate towards the exit aperture. In another version of this feature, the suturing instrument includes a suture having one end attached to the second needle, so that the second needle is transitioned from the loading slot to the exit aperture after the first needle is deployed from the cartridge by pulling on the free end of the suture. The suturing instrument may also include a means for pulling the free end of the suture optionally attached to the elongate body member and disposed opposite the distal portion thereof, such as, for example, a spool or a lever.

0041In yet another embodiment of the sixth aspect of the invention, the cartridge also contains a third needle. In this embodiment, the needle deployment mechanism is connectable sequentially to the first needle and the second needle and the third needle for moving the first needle and then the second needle and then the third needle from the cartridge out of the distal portion to the needle catch.

0042In still another embodiment of the sixth aspect of the invention, the suturing instrument includes a handle that is disposed opposite the distal portion of the elongate body member and at least partially houses the needle deployment mechanism.

0043In various embodiments according to the foregoing aspects of the invention, the elongate body member is adapted to access remote organs or tissue within a body. Also, the suturing instrument disclosed above may include one, two, or more bends.

0044Advantages and features of the present invention herein disclosed will become apparent through reference to the following description, the accompanying drawings, and the claims. Furthermore, it is to be understood that the features of the various embodiments described herein are not mutually exclusive and can exist in various combinations and permutations.

BRIEF DESCRIPTION OF THE DRAWINGS

0045In the drawings, like reference characters generally refer to the same parts throughout the different views. Also, the drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles of the invention. In the following description, various embodiments of the present invention are described with reference to the following drawings, in which: <ul id="ul0001" list-style="bullet" compact="compact"><li><figref idref="f0001">FIG. 1A</figref> is a schematic plan view of one embodiment of a suturing instrument in accordance with the invention;</li><li><figref idref="f0002">FIG. 1B</figref> is a schematic cross-sectional view of a proximal portion of the suturing instrument of <figref idref="f0001">FIG. 1A</figref>;</li><li><figref idref="f0003">FIG. 1C</figref> is a schematic cross-sectional view of a distal portion of the suturing instrument of <figref idref="f0001">FIG. 1A</figref>;</li><li><figref idref="f0004">FIG. 2A</figref> is a schematic plan view of a needle coupled to a suture for use in a suturing instrument in accordance with the invention;</li><li><figref idref="f0004">FIG. 2B</figref> is a schematic perspective view of a needle catch for use with the suturing instrument of <figref idref="f0001">FIG 1A</figref>;</li><li><figref idref="f0005">FIG. 3A</figref> is a schematic perspective view of a distal portion of a suturing instrument including a multi-load needle cartridge in accordance with the invention;</li><li><figref idref="f0006">FIG. 3B</figref> is an enlarged cross-sectional view of the suturing instrument of <figref idref="f0005">FIG. 3A</figref>;</li><li><figref idref="f0007">FIG. 4A</figref> is a schematic perspective view of a distal portion of a multi-needle suturing instrument in accordance with the invention;</li><li><figref idref="f0008">FIG. 4B</figref> is a schematic perspective view of an alternative multi-needle suturing instrument having two operative portions in accordance with the invention;</li><li><figref idref="f0008">FIG. 4C</figref> is an enlarged schematic perspective view of the operative portions of the suturing instrument of <figref idref="f0008">FIG. 4B</figref> in an aligned position;</li><li><figref idref="f0008">FIG. 4D</figref> is an enlarged schematic perspective view of the operative portions of the suturing instrument of <figref idref="f0008">FIG. 4B</figref> in a spread position;</li><li><figref idref="f0008">FIG. 4E</figref> is a schematic perspective view of a single suture placement in tissue;</li><li><figref idref="f0008">FIG. 4F</figref> is a schematic perspective view of a double suture placement in tissue;</li><li><figref idref="f0009">FIG. 5A</figref> is a schematic cross-sectional perspective view of a distal portion of a suturing instrument including a needle reloading mechanism in accordance with the invention;</li><li><figref idref="f0010">FIG. 5B</figref> is a schematic perspective view of a pusher rod for use with the suturing instrument of <figref idref="f0009">FIG. 5A</figref>;</li><li><figref idref="f0011">FIG. 5C</figref> is a schematic cross-sectional perspective view of a proximal portion of the suturing instrument of <figref idref="f0009">FIG. 5A</figref>;</li><li><figref idref="f0012">FIGS. 5D-5F</figref> are schematic plan views of the needle reloading mechanism of the suturing instrument of <figref idref="f0009 f0010 f0011">FIGS. 5A-5C</figref> in operation;</li><li><figref idref="f0013">FIG. 5G</figref> is a schematic cross-sectional view of a modified handle for use with the suturing instrument of <figref idref="f0009 f0010 f0011">FIGS. 5A-5C</figref>;</li><li><figref idref="f0014">FIG. 5H</figref> is a schematic plan view of a modified elongate body member for use with the suturing instrument of <figref idref="f0009 f0010 f0011">FIGS. 5A-5C</figref>;</li><li><figref idref="f0015">FIG. 6A</figref> is a schematic perspective view of an embodiment of a suturing instrument having a deflectable distal portion;</li><li><figref idref="f0015">FIGS 6B-6D</figref> are schematic perspective views of the deflectable distal portion of the suturing instrument of <figref idref="f0015">FIG. 6A</figref> in different positions;</li><li><figref idref="f0016">FIG. 6E</figref> is a schematic cross-sectional view of the suturing instrument of <figref idref="f0015">FIG. 6A</figref>;</li><li><figref idref="f0016">FIG. 6F</figref> is a schematic cross-sectional view of one embodiment of a locking mechanism for use with a suturing instrument in accordance with the invention;</li><li><figref idref="f0017">FIG. 7A</figref> is a schematic perspective view of a suturing instrument having a distal portion that is pivotable about one axis in accordance with the invention;</li><li><figref idref="f0017">FIGS. 7B and 7C</figref> are enlarged schematic perspective views of the pivotable distal portion of the suturing instrument of <figref idref="f0017">FIG. 7A</figref>;</li><li><figref idref="f0018">FIG. 7D</figref> is a schematic perspective view of a suturing instrument including a distal portion that is pivotable about two axes in accordance with the invention;</li><li><figref idref="f0018">FIGS. 7E-7H</figref> are enlarged schematic perspective views of the distal portion of the suturing instrument of <figref idref="f0018">FIG. 7D</figref>;</li><li><figref idref="f0019">FIGS. 8A-8C</figref> are schematic plan views of a suturing instrument including an alternative embodiment of a pivotable distal portion in accordance with the invention;</li><li><figref idref="f0021">FIG. 8D</figref> is an enlarged schematic view of the distal portion of the suturing instrument of <figref idref="f0019">FIG. 8A</figref>;</li><li><figref idref="f0022">FIG. 8E</figref> is an enlarged schematic cross-sectional view of the distal portion of the suturing instrument of <figref idref="f0019">FIG. 8C</figref>;</li><li><figref idref="f0023">FIG. 9A</figref> is a schematic plan view of a suturing instrument including an alternative embodiment of a pivotable distal portion of a suturing instrument in accordance with the invention;</li><li><figref idref="f0024">FIG. 9B</figref> is an enlarged schematic partial cross-sectional view of the distal portion of the suturing instrument of <figref idref="f0023">FIG. 9A</figref>;</li><li><figref idref="f0024">FIG. 9C</figref> is an enlarged schematic partial cross-sectional view of the distal portion of the suturing instrument of <figref idref="f0023">FIG. 9A</figref> in a pivoted position;</li><li><figref idref="f0025">FIG. 10A</figref> is a schematic cross-sectional view of an alternative embodiment of a pivotable distal portion of a suturing instrument in accordance with the invention;</li><li><figref idref="f0025">FIG. 10B</figref> is a schematic cross-sectional view of the pivotable distal portion of <figref idref="f0025">FIG. 10A</figref> in a pivoted position;</li><li><figref idref="f0026">FIG. 11A</figref> is a schematic cross-sectional view of an alternative embodiment of a pivotable distal portion of a suturing instrument including a drum-and-camshaft needle deployment mechanism in accordance with the invention;</li><li><figref idref="f0027">FIG. 11B</figref> is a schematic cross-sectional view of the distal portion of the suturing instrument of <figref idref="f0026">FIG. 11A</figref> with a needle deployment mechanism in a deployed position;</li></ul>

DESCRIPTION

0046Referring to <figref idref="f0001">FIG. 1A</figref>, in one embodiment, a suturing instrument 100 includes a handle 102, an elongate body member 104, and a needle deployment mechanism 110 disposed within the elongate body member 104 and the handle 102. The suturing instrument 100 also includes a distal portion 106 and a proximal portion 108. The elongate body member 104 is mechanically coupled to the handle 102 at the proximal portion 108 and the suturing components are at least partially disposed within the distal portion 106 of the suturing instrument 100.

0047The handle 102 can take a variety of forms, for example, the handle 102 could be one of the types compatible with suturing systems available from Boston Scientific Corporation of Natick, Massachusetts, in particular with the Capio^® Push &amp; Catch suturing system. A suture clip 144 may be coupled to the handle 102 or the elongate body member 104 and used to hold an end of one or more sutures 136 prior to placement in a patient. Generally, the needle deployment mechanism 110 extends longitudinally through the elongate body member 104 to the distal portion 106 of the suturing instrument 100, where the needle deployment mechanism 110 is coupled to a needle 128 (shown in <figref idref="f0004">FIG. 2A</figref>). The needle deployment mechanism 110 moves the needle 128 between a retracted position and a deployed position. One possible needle deployment mechanism 110 is shown in greater detail in <figref idref="f0002">FIGS. 1B</figref> and <figref idref="f0003">1C</figref>.

0048Referring to <figref idref="f0002">FIG. 1B</figref>, in one embodiment, the proximal portion 108 of the suturing instrument 100 includes the handle 102, the elongate body member 104, the suture clip 144, and the needle deployment mechanism 110. The needle deployment mechanism 110 includes an actuator button 117 and a shaft 116 that together form an actuator 112. The needle deployment mechanism 110 also includes a bearing 118 and a button end 119 that defines a hole 121 formed therein. The hole 121 is preferably formed along the central longitudinal axis of the button end 119. The bearing 118 rides along the surface of a lumen 105 that is defined by the inside diameter of the elongate body member 104. A wireform 103 is inserted into the hole 121 of the button end 119, so that the wireform 103 is coupled to the actuator button 117. A spring 115 encircles the wireform 103, abuts the button end 119, and is compressed between the button end 119 and a spring washer 113. The spring washer 113 is seated upon a center tube 107. The center tube 107 is housed by the lumen 105 and is constrained in the distal portion 106. A pusher wire 111 is attached to the wireform 103 by means of a weld, a coupling, adhesive, or other means, and is slidably disposed within a guidance sleeve 109, the sleeve 109 being disposed within the surface of a lumen 123 defined by the inside diameter of the center tube 107.

0049In one embodiment, the pusher wire 111 is constructed of an elastic material having "superelastic" properties. Such a material may include alloys of In-Ti, Fe-Mn, Ni-Ti, Ag-Cd, Au-Cd, Au-Cu, Cu-Al-Ni, Cu-Au-Zn, Cu-Zn, Cu-Zn-Al, Cu-Zn-Sn, Cu-Zn-Xe, Fe₃Be, Fe₃Pt, Ni-Ti-V, Fe-Ni-Ti-Co, and Cu-Sn. In the illustrative embodiment, the superelastic material is a nickel and titanium alloy, commonly known as Nitinol^® available from Memry Corp of Brookfield, CT or SMA Inc. of San Jose, CA, so chosen for its combination of properties that allow for bendability and high column strength when constrained. The ratio of nickel and titanium in Nitinol^® may vary. One preferred example includes a ratio of about 50% to about 56% nickel by weight. Nitinol^® also possesses shape retention properties.

0050Referring to <figref idref="f0003">FIG. 1C</figref>, the distal portion 106 of the elongate body member 104 includes the distal components of the needle deployment mechanism 110 (described in detail below), an operative portion 126, and a needle catch 122. In one embodiment, the operative portion 126 has an arcuate shape and partially encircles a suturing field 176. The operative portion 126 also defines a lumen 178 therein having a needle exit port 120 at an opening into the suturing field 176. A needle 128 is disposed in the needle exit port 120 and is held in place by a slight friction fit. In one embodiment, the suture 136 is attached to the needle 128. The free end of the suture 136 extends out of a suture slot 146.

0051Referring again to the needle deployment mechanism 110, the pusher wire 111 is attached by welding or other means to a coupling 150, which is slidably disposed within a track 152. The coupling 150 is attached to a carrier wire 154, which, by virtue of its attachment to the coupling 150, is also slidably disposed within the track 152. The coupling 150 abuts a backstop washer 156 that is slidably disposed about the pusher wire 111 and is contained within a pocket 160 that includes a back wall 162, against which the backstop washer 156 rests. The track 152 terminates distally in a pocket 164 that includes a wall 166. A downstop washer 158 is slidably disposed about the carrier wire 154 and constrained within the pocket 164.

0052The carrier wire 154 is mechanically coupled to an extendable needle carrier 124 by welding, coupling, use of adhesives, or by other means. The needle carrier 124 is slidably disposed in the lumen 178 of the operative portion 126 and has a lumen 125 formed at a distal end of the needle carrier 124. The lumen 125 is dimensioned to releasably receive the non-penetrating end of the needle 128. The needle carrier 124 is configured to push the needle 128 out of the needle exit port 120 through tissue proximate the suturing field 176, and into the needle catch 122, as will be described in further detail below. In one embodiment, the needle 128 is held within the lumen 125 by a slight friction fit.

0053<figref idref="f0004">FIG. 2A</figref> depicts one embodiment of the needle 128 for use in a suturing instrument in accordance with the invention. In this embodiment, the needle 128 includes a penetrating tip 130 and a shaft 134 coupled to the tip 130, thereby forming a shoulder 132. The shaft 134 is coupled to the suture 136. Other configurations of the needle 128 can also be used without deviating from the scope of the invention. As shown in <figref idref="f0003">FIG. 1C</figref>, in one embodiment, when the needle 128 is disposed in the needle exit port 120, the free end of the suture 136 extends out of a needle carrier suture slot 148 and the suture slot 146.

0054Referring to <figref idref="f0004">FIG 2B</figref>, the needle catch 122 includes openings 170 defined by successive ribs 172. When the needle catch 122 receives the needle 128 coupled to the suture 136 through opening 170, the ribs 172 deflect slightly to allow the needle 128 to pass through. After the shoulder 132 has passed the ribs 172, the ribs 172 spring back to their original position defining the openings 170, and the needle 128 remains captured in the needle catch 122. The openings 170 are chosen to be smaller in dimension than the shoulder 132. This causes the needle catch 122 to retain the needle 128, because the flat rear surface of the shoulder 132 prevents the needle 128 from passing back through the opening 170. When it is necessary to remove the needle 128 from the needle catch 122, the needle 128 may be moved toward an enlarged portion 174 of the opening 170. The enlarged portion 174 is sized to allow the shoulder 132 to pass through without resistance. The needle catch 122 may be constructed of thin stainless steel of high temper, such as ANSI 301 full hard. The needle catch 122 may be fabricated by means of stamping, laser machining, or chemical etching.

0055Referring again to <figref idref="f0001 f0002 f0003">FIGS. 1A-1C</figref> and <figref idref="f0004">2A-2B</figref>, in operation, a user (such as a physician or other medical personnel) actuates the needle deployment mechanism 110 by pushing on the button 117, which, via the attachment to the wireform 103, is attached to the pusher wire 111, moves the coupling 150 along the track 152 concomitantly moving the carrier wire 154, which in turn slidably moves the needle carrier 124 through the lumen 178 towards the needle exit port 120. The user continues to push the button 117 until the needle carrier 124 receives the needle 128 in the lumen 125, and further until the needle 128 penetrates tissue proximate the suturing area 176 and then enters and is retained in the needle catch 122. Then, the user releases the button 117 and the spring 115 urges the button 117 proximally, thereby moving the pusher wire 111, the coupling 150, the carrier wire 154, and the needle carrier 124 proximally along with the button 117 to the retracted position. As the needle carrier 124 moves back to the retracted position, the needle 128 slides out of the lumen 125 and the needle is released from the needle carrier 124.

0056In one embodiment, after one or more sutures 136 have been placed, the user withdraws the suturing instrument 100 from the patient. The user then detaches one or more sutures 136 from one or more needles 128 and ties a knot or knots in the sutures 136. The user can then use a knot pusher 184 to push one or more knots into the patient as the knots are tightened.

0057The suturing instrument's component materials should be biocompatible. For example, the handle 102, the elongate body member 104, and portions of the needle deployment mechanism 110 may be fabricated from extruded, molded, or machined plastic material(s), such as polypropylene, polyethylene, polycarbonate, or glass-filled polycarbonate. Other components, for example the needle 128, may be made of stainless steel. Other suitable materials will be apparent to those skilled in the art. The material(s) used to form the suture should be biocompatible. The surgeon will select the length, diameter, and characteristics of the suture to suit a particular application.

0058<figref idref="f0005">FIGS. 3A</figref> and <figref idref="f0006">3B</figref> depict two embodiments of a suturing instrument having a multi-load cartridge 140 in accordance with the invention. Such a suturing instrument advantageously allows the user to place multiple sutures without removing the suturing instrument from the surgical site. According to both embodiments, the suturing instrument 100 includes the cartridge 140 that houses two or more needles 128 disposed therein. Referring to <figref idref="f0005">FIG. 3A</figref>, the cartridge 140 is integrally formed within the distal portion 106. In this embodiment, the distal portion 106 defines a sidewall access opening 141 to allow the user to load one or more needles 128 into the cartridge 140. Referring to <figref idref="f0006">FIG. 3B</figref>, the cartridge 140 is either integrally formed or removably disposed at a distal end 142 of the operative portion 126. Having a removable cartridge allows the user to choose a cartridge having a specific number of needles for a specific application. Also, the suturing instrument 100 may be reusable with different needle cartridges.

0059Referring still to <figref idref="f0006">FIG. 3B</figref>, the multi-load needle cartridge 140 defines an exit aperture 145 and a needle loading slot 147. The multi-load needle cartridge 140 is designed to hold essentially any number of needles, for example, 2-20 needles. The multi-load needle cartridge 140 is preloaded and capable of feeding the needle and suture assembly into the needle carrier 124. In one embodiment, the cartridge 140 can be reloaded by the user in situ by adding needles 128 using, for example, the sidewall access opening 141 (<figref idref="f0005">FIG. 3A</figref>) or the exit port 120 (<figref idref="f0006">FIG. 3B</figref>). The multi-load needle cartridge 140 may include a push plate 196 and a spring 198 that biases the push plate 196 towards the exit aperture 145.

0060Both embodiments operate in essentially the same manner, enabling a user to place multiple sutures 136 in a patient without removing the suturing instrument 100 from the surgical site. As described above, the preloaded multi-load needle cartridge 140 can include one or more needles 128 each with the suture 136 coupled thereto. Referring to <figref idref="f0006">FIG. 3B</figref>, in one embodiment, the needle cartridge 140 includes three needles 128a, 128b, 128c. Sutures 136a, 136b, 136c extend out of the suture slot 146. Alternatively, the sutures 136 may run through the elongate body member 104. The first needle 128a is disposed in the exit aperture 145, and the remaining needles 128b, 128c are disposed in the loading slot 147.

0061The needle carrier 124, which is part of the needle deployment mechanism 110, is sequentially connectable to the needles 128 stored in the cartridge 140. This means that each needle 128 stored in the needle cartridge 140 is connected to, and then deployed by, the needle carrier 124 one at a time in the order the needles 128 are dispensed from the needle cartridge 140.

0062In operation, the user inserts the elongate body member 104 into a patient and orients the elongate body member 104 so that the tissue to be sutured is disposed proximate the suturing field 176 and the needle exit port 120 is proximate to or in contact with the tissue. The user then pushes the button 117 (<figref idref="f0002">FIG. 1B</figref>), as described above. Pushing the button 117 causes the needle carrier 124 to receive the needle 128a in the lumen 125 and then to extend out of the needle exit port 120 and push the needle 128a through the tissue. As the first needle 128a is pushed through the tissue, the first needle 128a pulls the first suture 136a through the tissue. As the user continues to push the button 117, the needle carrier 124 continues to advance out of the needle exit port 120 and directs the first needle 128a and the first suture 136a toward the needle catch 122. The user continues to push the button 117 until the first needle 128a contacts and becomes captured by the needle catch 122. The user then retracts the needle carrier 124 by releasing the button 117, as previously described.

0063After the user retracts the needle carrier 124, the first needle 128a and the first suture 136a are left captured within the needle catch 122, with the first suture 136a extending through the tissue. When the needle carrier 124 returns to a fully retracted position, the spring 198 causes the needle push plate 196 to push the second needle 128b into the exit aperture 145. The needle 128b is thereby forced through the loading slot 147 and either into the lumen 125 of the needle carrier 124 or in position to be captured by the needle carrier 124. The second suture 136b extends out of the suture slot 146. The user then advances the needle carrier 124 as described above until the second needle 128b is captured by the needle catch 122. The user then retracts the needle carrier 124 as described above leaving the second needle 128b and the second suture 136b captured by the needle catch 122. This procedure can be repeated for the third needle 128c, or for as many needles as may be stored in the needle cartridge 140. After one or more sutures 136 have been placed, the user withdraws the suturing instrument 100 from the patient. The user detaches the suture(s) 136 from the needle(s) 128 and ties a knot or knots in the suture(s) 136. The user can then use the knot pusher 184 to push the knot(s) in the patient as the knot(s) is tightened.

0064Alternatively, other mechanisms could be used to advance the needle 128 from the needle cartridge 140 to the carrier 124. In one embodiment, the needles 128 in the needle cartridge 140 are held in the loading slot 147 by a friction fit and are pushed into the exit aperture 145 when the needle push plate 196 is activated by the user. For example, instead of the spring 198, a dispensing control rod coupled to a button on the handle 102 and the push plate 196 may be provided. Alternatively, a spring release mechanism coupled to the spring 198 and a button on the handle 102 may be provided to enable the user to release the spring 198 so that the push plate loads the needle 128 into the exit aperture 145 to be received in the lumen 125 of the needle carrier 124. In another embodiment, the user may load the needle 128 into the exit aperture 145 by pulling the free end of the suture 136. In yet another embodiment, the suturing instrument 100 may include a means for pulling the free end of the suture 136 such as, for example, a spool or a lever attached to the elongate body member and disposed, for example, on or within the handle 102

0065Referring to <figref idref="f0007">FIG. 4A</figref>, in another embodiment, the operative portion 126 of the distal portion 106 of the suturing instrument 100 includes a mechanism for deploying two or more needles 128. The needles 128 can be deployed sequentially or simultaneously. The deployment mechanism includes a separate needle carrier 124a, 124b for each needle 128. The handle 102 can include one button 117 to advance both needles 128 or the handle 102 can include two buttons 117a, 117b to advance the needles 128 sequentially or simultaneously (if pressed at the same time). Passing two single armed needles into an incision site enables a user to place, for example, two ligating sutures simultaneously, withdrawing the device, and tying two knots. Ligating between the sutures is possible in a shorter time-frame.

0066In operation, this embodiment functions largely the same way as the embodiments previously described. For simultaneous advancement, the user advances the needle carriers 124 by pressing the button(s) 117 (<figref idref="f0001">FIG. 1A</figref>) until the needles 128 are driven through the tissue and captured by the needle catch 122. After the needles 128 are captured in the needle catch 122, the needle carriers 124 are retracted. For sequential advancement, the user advances one needle carrier 124a by pressing one button 117a until the first needle 128a is driven through the tissue and captured by the needle catch 122. The user then retracts the first needle carrier 124a. The user then advances the second needle carrier 124b by pressing the second button 117b until the second needle 128b is driven through the tissue and captured by the needle catch 122. The user then retracts the second needle carrier 124b.

0067Referring to <figref idref="f0008">FIGS. 4B-4D</figref>, in another embodiment, the distal portion 106 includes two separate operative portions 126a, 126b separated a wedge 200. The operative portions 126a, 126b include the needle exit ports 120a, 120b that are deflectable or spreadable outward relative to the elongate member 104 to adjust the distance between the exit ports 120a, 120b. The user may control the amount of separation between the operative portions 126a, 126b and, therefore, the distance between the exit ports 120a, 120b with a control lever 202 in the handle 102. Other mechanisms that can be used to deflect the operative portions 126a, 126b include, but are not limited to, a cam or link, an elbow linkage, a rotational separation along a longitudinal axis 350 of the device, a pre-made track and follower assembly, or a manual separator. In a particular embodiment, the user actuates the control lever 202, thereby advancing the wedge 200 and widening the space between the two operative portions 126a, 126b.

0068One benefit of the embodiments depicted in <figref idref="f0007 f0008">FIGS. 4A-4D</figref> and described above is that spreading the operative portions 126a, 126b allows a user to create a controlled or predetermined distance between the needle carriers' tissue entrance points. This feature enables the placing of sutures 136 at different spacing sequences. In addition, these embodiments also provide a means to place a double-armed suture (a suture with a needle at each end) in a patient. Referring to <figref idref="f0008">FIGS. 4E and 4F</figref>, the needle deployment mechanism 110 generally functions the same way as previously described and can be used to place a single suture 136 coupled to two needles 128a, 128b through tissue 204 (<figref idref="f0008">FIG. 4E</figref>) or to place two sutures 136a, 136b coupled to two needles 128a, 128b, respectively (<figref idref="f0008">FIG. 4F</figref>) through tissue 204. Referring to <figref idref="f0008">FIG. 4E</figref>, where a single suture 136 is attached to the two needles 128a, 128b, the suture 136 is placed perpendicularly to the longitudinal axis 350 of the suturing instrument. Referring to <figref idref="f0008">FIG. 4F</figref>, where separate sutures 136a, 136b are attached to each of the two needles 128a, 128b, the sutures 136a, 136b can be placed in essentially any orientation relative to the longitudinal axis 350 of the suturing instrument.

0069Referring to <figref idref="f0009 f0010 f0011 f0012 f0013 f0014">FIGS 5A-5H</figref>, in yet another embodiment, the suturing instrument 100 is modified to allow the user to place a so-called "whip stitch," i.e., a continuous running suture. Typically, the suturing instrument must be removed from the surgical site so the user may disengage the needle from the needle catch and either reload the existing needle into the needle carrier or load a new needle and suture into the instrument. In this embodiment, the user can remove the needle from the catch and reload the needle into the needle carrier without removing the suturing instrument 100. This allows the user to place a running stitch. This embodiment may be combined with any number of the other embodiments described herein.

0070Generally, the instrument is used to secure tissue with a continuous running suture by passing the suture through tissue, catching the suture needle, ejecting the needle from the catch in situ, and reloading the needle into the carrier. The suturing instrument 100 essentially operates in the same manner as the other instruments described herein. The instrument is modified, however, to add a needle reloading mechanism 205 described in detail below that, when advanced, pushes the needle 128 along the needle catch 122 to an opening that permits the needle to be discharged from the catch 122. The needle 128 can be discharged by, for example, pulling on the suture 136. Continued pulling on the suture 136 can reposition the needle 128 into the end of the needle carrier 124. The reloaded carrier 124 can then be advanced again, continuing suture placement through multiple tissue passes, resulting in a whip stitch.

0071<figref idref="f0009">FIG. 5A</figref> depicts the distal portion 106 of the suturing instrument 100. The needle carrier 124 and needle catch 122 are disposed in the distal portion 106. The needle catch 122 is similar to the catch described hereinabove with respect to <figref idref="f0004">FIG 2B</figref>; however, the catch 122 is slightly modified to include two protrusions 210 disposed between the ribs of the center opening 213 to create a narrow portion in the opening 213. The protrusions 210 prevent the needle 128 from moving to the larger opening, i.e., the needle reloading aperture 174, in the catch 122 before the suturing instrument 100 is ready for reloading. In one embodiment, the needle catch 122 is slidably movable towards the needle exit port 120.

0072<figref idref="f0010">FIG. 5B</figref> depicts a needle reloading mechanism 205. The mechanism 205 includes a pusher rod 208 and an actuator 206. The actuator 206 is generally perpendicularly disposed relative to the rod 208 and is attached to the rod 208 by, for example, welding or other attachment means. Additionally, the mechanism 205 includes a hook 211 that couples to a spring 207 located within the handle 102 (<figref idref="f0011">FIG. 5C</figref>). The spring 207 acts to return the mechanism 205 to its original position once the actuator 206 is released. In a particular embodiment, the mechanism 205 is slidably disposed within the suturing instrument 100.

0073Referring to <figref idref="f0011">FIG. 5C</figref>, the proximal portion 101 of the suturing instrument 100 is modified compared to the embodiment shown in <figref idref="f0001">FIG. 1A</figref>. Specifically, the handle 102 is modified to house at least a portion of the mechanism 205, as well as to include a slot 209 to house the actuator 206.

0074<figref idref="f0012">FIGS. 5D-5F</figref> are enlarged partial views of the needle catch 122 and pusher rod 208. As shown, the needle 128 is held within the center opening 213 of the catch 122 between two ribs or flexible edges 172. The pusher rod 208 includes a concave distal end that at least partially surrounds the needle 128 when the rod 208 is advanced into contact with the needle 128 (<figref idref="f0012">FIG. 5E</figref>). The pusher rod 208 pushes the needle 128 along the center opening 213 to the larger opening 174. The needle 128 is moved past the protrusions 210 by the force of the pusher rod 208. The force causes the ribs 172 to spread slightly to allow the needle 128 to pass. When the pusher rod 208 is fully advanced, the needle 128 will be positioned within the reloading aperture 174 (<figref idref="f0012">FIG. 5F</figref>). Alternatively, the needle 128 could be held within one of the lateral openings 215, 217 in a catch 122 further modified to include protrusions 210 in the lateral openings 215, 217. The pusher mechanism 205 can also be modified to push a needle 128 held in one or both of the lateral openings 215, 217.

0075<figref idref="f0013">FIG. 5G</figref> depicts the modified handle 102. As described hereinabove, the handle 102 includes the slot 209 for the actuator 206 and a void 217 for housing the proximal portion of the rod 208 and the spring 207 and hook 211. While the actuator 206 described herein is slidably disposed within the handle 102, other mechanical linkages are contemplated, for example, a push button and push wire assembly. The dimensions shown are for illustrative purposes only and are not meant to be limiting.

0076<figref idref="f0014">FIG. 5H</figref> depicts the modified elongate body member 104 compared to the embodiment depicted in <figref idref="f0001">FIG. 1A</figref>. The body member 104 is modified to house at least partially the pusher mechanism 205, specifically the pusher rod 208. The body member 104 includes a slot 219 that runs substantially the entire length of the body member 104. The pusher rod 208 is slidably disposed within the slot 219.

0077Operation of the instrument is described generally with reference to <figref idref="f0009 f0010 f0011 f0012 f0013 f0014">FIGS. 5A-5H</figref>. The basic operation is similar to that described hereinabove with reference to <figref idref="f0001 f0002 f0003">FIGS. 1A-1C</figref>, insofar as the user presses the button 117 thereby advancing the needle carrier 124 and pushing the needle 128 into the catch 122. After the user drives the needle through the tissue 204 and into the catch 122, the user positions the distal portion 106 of the suturing instrument 100 so that the tissue 204 is no longer in the surgical field 176. During operation, the suture 136 is preferably maintained in tension. A free end of the suture 136 remains outside of the surgical site and accessible to the user. Next, the user advances the needle reloading mechanism 205 into contact with the needle 128 by pushing the actuator 206 distally. Once the pusher mechanism 205 is fully advanced, the needle 128 is positioned within the needle reloading aperture 174. In this position, the free end of the suture 136 can be pulled to release the needle 128 from the catch 122 and, in turn, lead the needle 128 into the needle carrier. In addition, the needle carrier can be partially advanced to assist reloading of the needle 128 into the carrier. Also, the distal end of the needle carrier 124 can be modified to facilitate reloading. For example, the distal end of the carrier 124 and the lumen 125 could be enlarged to create a sufficient lead in for recapturing the needle 128. Further, as described above, the needle catch 122 may be slidable distally to position the needle 128 close to the carrier 124 before releasing the needle 128. After the needle 128 is recaptured in the lumen 125 of the needle carrier 124 and the needle carrier 124 is fully retracted into the operative portion 126, the user maneuvers the suturing instrument 100 and/or the tissue 204 so that the tissue 204 is disposed again proximate the suturing field 176 and the exit port 120 is proximate to the next stitching position in the tissue 204.

0078Referring to <figref idref="f0015">FIGS. 6A-6D</figref>, the suturing instrument 100 includes a distal portion 106 having a beveled surface 307a for contacting the elongate body member 104 and the elongate body member includes a beveled surface 307b for contacting the distal portion. According to one feature of this embodiment, the acute angle defined by the beveled surface 307a and the acute angle defined the beveled surface 307b are substantially equal. In one embodiment, each of these angles substantially equals 45 degrees. The surfaces 307a, 307b are secured against each other by a spring 310 disposed in the elongate member 104. In an aligned position, the surfaces 307a, 307b are aligned such that the distal portion 106 and the elongate body member 104 combine to produce a shaft that is substantially linear. The handle 102 includes a deflection control lever or member 312 that is coupled to a first end of a rod 320 that extends through the elongate member 104. A second end of the rod 320 is coupled to the distal portion 106. When the user manipulates the deflection control lever 312, the distal portion 106 rotates and, by virtue of the contacting beveled surfaces 307a, 307b, a rotation point 308 forms, thereby enabling suturing of tissue at any angle relative to the elongate body member's longitudinal axis 350 (or angles of surface contact).

0079As shown in <figref idref="f0016">FIG. 6F</figref>, the suturing device 100 includes a locking mechanism that includes a ball 314 and a plurality of detents 316. The ball 314 is coupled to the beveled surface 307b of the elongate member 104 at a point radially outward from the longitudinal axis 350 of the distal portion 106. The ball 314 is positioned on the elongate member 104 to allow it to contact the beveled surface 307a of the distal portion 106. Each of the plurality of detents 316 may be disposed equally about the circumference about the beveled surface 307a of the distal portion 106. The circle of detents 314 may be centered on the longitudinal axis of the distal portion 106. Each detent 316 may have a radial distance from the longitudinal axis of the distal portion 106 equal to that of the ball 314. As the user deflects the distal portion 106 by manipulating the deflection control lever 312, the ball 314 moves out of one detent 316 and into another detent 316. The detents are spaced such that the distal portion rotates in a stepwise manner. Each step may be a fixed number of degrees of rotation. In another embodiment, the ball 314 is coupled to a spring 318 disposed in an aperture 321 formed in the beveled surface 307b. The spring 318 provides enough force to keep the ball 314 socketed in one of the detents when the user is not trying to change the angle of the distal portion 106 relative to the longitudinal axis 350 of the elongate body member 104. The spring 318 is, however, compressible such that the ball 314 is at least partially withdrawn into the aperture 321 1 and the user can easily change the angle of the distal portion 106 relative to the longitudinal axis 350 of the elongate body member 104 by moving the ball 314 from one detent 316a to another detent 316b.

0080Referring to <figref idref="f0017">FIGS. 7A-7C</figref>, in another embodiment, the suturing instrument 100 includes a distal portion 106 that is independently pivotable about the axis 330 perpendicular to the longitudinal axis 350 of the elongate member 104 and rotatable about the longitudinal axis 350 of the elongate member 104. In one version of this embodiment, the degree of pivot is controlled by a pivot control lever 400 located on the handle 102 and coupled to a pivot control mechanism disposed within the elongate member 104. The pivot control mechanism is coupled to the distal portion 106. When the user manipulates the pivot control lever 400 slidably moving the pivot control mechanism within the elongate member 104, the distal portion 106 pivots about the pivot axis 330. This embodiment enables the suturing of tissue at angles up to 90 degrees from the longitudinal axis 350 of the elongate body member 104. The suturing instrument 100 also allows for removal from a 10mm trocar without repositioning the distal portion 106.

0081Referring to <figref idref="f0018">FIGS. 7D-7H</figref>, in an alternative embodiment, the suturing instrument 100 includes a pivoting and rotating distal portion 106. The suturing instrument 100 also includes a pivot control lever 504, a rotation control lever 506, and a needle deployment trigger 502. The user can pivot the distal portion 106 by manipulating the pivot control lever 504 on the handle 102. The distal end 106 can be pivoted to a position perpendicular to the tissue plane to be sutured. The internal operation of the pivoting mechanism is similar to embodiments discussed above. The user can also rotate the distal portion 106 by manipulating the rotation control lever 506 also disposed on the handle 102, that is coupled to a rotation mechanism, which, in turn, is coupled to the distal portion 106. The needle 128 is deployed by pulling the needle deployment trigger 502. The needle deployment mechanism operates similar to other embodiments previously described.

0082Referring to <figref idref="f0019 f0020 f0021 f0022">FIGS. 8A-8E</figref>, in another embodiment, the suturing instrument 100 includes a pivoting distal portion 106 and a pivot control lever 508. The elongate member 104 includes an outer portion 516 and an inner portion 518, and is coupled to the distal portion 106 at a pivot point 514 and via linkage 512 (<figref idref="f0021">FIG. 8D</figref>). The user controls the pivoting action by manipulating the pivot control lever 508, thereby causing the outer portion 516 to slide relative to the inner portion 518. Pushing the control lever 508 causes the outer portion 516 to push the linkage 512, which, in turn, pushes the distal portion 106. As the distal portion 106 is pushed by the linkage 512, the distal portion pivots about the pivot point 514. The distal portion 106 can pivot up to 90 degrees relative to the longitudinal axis 350 of the elongate body member 104. Pulling the control lever 508 causes the outer portion 516 to pull the linkage 512, which pulls the distal portion 106. As the distal portion 106 is pulled by the linkage 512, the distal portion 106 pivots about the pivot point 514 and returns to its original position. In one embodiment, the control lever 508 maybe be coupled to the outer portion 516 via a pin 509 or other attachment means. Alternatively, the control lever 508 is not coupled to the outer portion 516, but is pushed into contact with the outer portion 516 via, for example, the pin 509. Further, the outer portion 516 may be biased against the control lever 508 by a spring that causes the distal portion 106 to return to its starting position when the control lever 508 is released.

0083According to this embodiment of the invention, in one version, the needle deployment mechanism 110 includes a loop 510 for advancing the needle carrier 124. The loop 510 is formed from a resilient material, such as rubber. The loop 510 is coupled to the button 117 at the proximal end of the elongate member 104 and coupled to the needle carrier 124 at a distal end. In operation, the user presses the button 117, which causes the loop 510 to advance. As the loop 510 advances, the needle carrier 124, which is coupled to the loop 510, also advances until the needle 128 in the needle carrier 124 is captured by the needle catch 122. After the needle 128 is captured in the needle catch 122, the user releases the button 117 and the loop 510 retracts thereby causing the needle carrier 124 to also retract.

0084Referring to <figref idref="f0023 f0024">FIGS. 9A-9C</figref>, in another version of this embodiment, the needle deployment mechanism 110 in the distal portion 106 includes a first gear 520, a second gear 524, and a linkage 522. The linkage 522 is coupled to the first gear 520 and the needle carrier 124. In operation, the user manipulates the button 117, which causes the second gear 524 to turn. The second gear 524 engages the first gear 520, thereby causing the first gear 520 to turn and pivot the distal portion 106. As the first gear 520 turns, the linkage 522 moves and advances the needle carrier 124 until the needle 128 is captured by the needle catch 122. After the needle 128 is captured by the needle catch 122, the user releases the button 117 and the first gear 524 and the second gear 520 turn in the opposite direction causing the linkage 522 to retract the needle carrier 124.

0085Referring to <figref idref="f0025">FIGS. 10A and 10B</figref>, in yet another embodiment, the needle deployment mechanism in the distal portion 106 includes a superelastic pusher 602. A proximal end of the superelastic pusher 602 is coupled to the button 117 (shown in <figref idref="f0002">FIG. 1B</figref>) and a distal end of the superelastic pusher 602 is coupled to the needle carrier 124. In operation, the user pushes the button 117, which causes the superelastic pusher 602 to advance the needle carrier 124 until the needle 128 is captured in the needle catch 122. After the needle 128 is captured by the needle catch 122, the user releases the button 117 and the superelastic pusher 602 retracts the needle carrier 124. This embodiment operates similarly to the embodiment described with reference to <figref idref="f0001 f0002 f0003">FIGS. 1A-1C</figref>. The superelastic pusher can be formed from an elastic material having "superelastic" properties, such as Nitinol^®.

0086Referring to <figref idref="f0026">FIGS. 11A</figref> and <figref idref="f0027">11B</figref>, in another embodiment, the needle deployment mechanism in the distal portion 106 includes a drum 608 and a camshaft 604. The drum 608 is coupled to a distal end of a push wire. A proximal end of the push wire is coupled to the button 117. The drum 608 is also coupled to the camshaft 604 and the camshaft 604 is coupled to the needle carrier 124. In operation, the user pushes the button 117, which causes the push wire to rotate the drum 608. As the drum 608 rotates, the camshaft 604 moves and advances the needle carrier 124 until the needle 128 is captured in the needle catch 122. After the needle 128 is captured by the needle catch 122, the user releases the button 117 and the push wire rotates the drum 608 in the opposite direction, thereby causing the camshaft 604 to retract the needle carrier 124. The push wire can be formed from, for example, stainless steel or nickel-titanium alloy.

0087The described embodiments are to be considered in all respects as only illustrative and not restrictive. Therefore, it is intended that the scope of the invention be only limited by the following claims.