Floating connector for microwave surgical device

<u style="single">CROSS-REFERENCE TO RELATED APPLICATIONS</u>

0001This application claims the benefit of priority to <patcit id="pcit0001" dnum="US99034107P"><text>U.S. Provisional Application Serial No. 60/990,341</text></patcit> entitled "FLOATING CONNECTOR FOR MICROWAVE SURGICAL DEVICES" filed November 27, 2007 by Gene H. Arts et al, which is incorporated by reference herein.

<u style="single">BACKGROUND</u>

1.

Technical Field

0002The present disclosure relates generally to microwave surgical devices used in tissue ablation procedures. More particularly, the present disclosure is directed to a floating connector assembly for coupling a microwave ablation antenna to a microwave generator.

2.

Background of Related Art

0003Microwave ablation of biological tissue is a well-known surgical technique used routinely in the treatment of certain diseases which require destruction of malignant tumors or other necrotic lesions. Typically, microwave surgical apparatus used for ablation procedures includes a microwave generator which functions as a source of surgical radiofrequency energy, and a microwave surgical instrument having a microwave antenna for directing the radiofrequency energy to the operative site. Additionally, the instrument and generator are operatively coupled by a cable having a plurality of conductors for transmitting the microwave energy from the generator to the instrument, and for communicating control, feedback and identification signals between the instrument and the generator. The cable assembly may also include one or more conduits for transferring fluids.

0004Commonly, the microwave instrument and the cable are integrated into a single unit wherein the cable extends from the proximal end of the instrument and terminates at a multi-contact plug connector, which mates with a corresponding receptacle connector at the generator. Separate contact configurations are typically included within the multi-contact connector to accommodate the different electrical properties of microwave and non-microwave signals. Specifically, coaxial contacts are used to couple the microwave signal, while non-coaxial contacts in a circular or other arrangement are used to couple the remaining signals and/or fluids. Suitable coaxial and non-coaxial connectors are commercially available "off the shelf" that can be used side-by-side within a single housing in the construction of a cost-effective multi-contact connector for microwave ablation systems.

0005The use of two disparate connectors within a single housing may have drawbacks. Specifically, the coaxial and non-coaxial connectors assembled within the cable-end plug must be precisely aligned with their mating connectors on the microwave generator receptacle to avoid interference or binding when coupling or uncoupling the connectors. The need for such precise alignment dictates the connectors be manufactured to very high tolerances, which, in turn, increases manufacturing costs and reduces production yields. This is particularly undesirable with respect to the microwave surgical instrument, which is typically discarded after a single use and thus subject to price pressure.

<u style="single">SUMMARY</u>

0006The present disclosure provides a floating connector apparatus having at least two connectors, such as a coaxial and a non-coaxial connector, within a single supporting housing. At least one of the connectors is floatably mounted to the housing. By using a floating rather than a rigid mounting, the floating connector is afforded a range of movement sufficient to compensate for spacing variations between and among the corresponding mating connectors. In this manner, commonly-available connectors can be used in a single supporting housing without requiring exacting manufacturing tolerances and the associated costs thereof.

0007In one embodimen, a plug (i.e., male) housing and a corresponding mating receptacle (i.e., female) housing are provided. The male housing includes a fixedly mounted male coaxial connector, such as a QN connector, that is mounted in spaced relation relative to a fixedly mounted male circular connector, such as an Odu^™ Medi-Snap^™ connector. The counterpart female housing includes a female coaxial connector that is fixedly mounted to the receptacle housing in spaced relation relative to a female circular connector that is floatably mounted to the receptacle housing. The floating female circular connector has at least one degree of freedom of movement, for example, the floatably mounted connector can move along the X-axis (i.e. left-right); the Y-axis (up-down); the Z-axis (in-out); or it can rotate, pitch, or yaw about the longitudinal axis of the circular connector, or any combination thereof. A positive stop can be included for limiting inward movement of the floating connector along its Z-axis to enable sufficient coupling force to be generated when mating the connectors. When the plug and receptacle are coupled, the floatably mounted connector is able to adjust to spacing and angular variations between it and the fixed connectors. This eliminates binding and interference among the connectors, establishes and maintains electrical continuity, provides tactile feedback to the user, and permits multiple connectors to be included within a single housing without the expense of precision manufacturing and high production tolerances.

0008According to another embodiment, the floating connector is mounted to a plate-like mounting assembly that includes a stationary rim concentrically disposed around a suspended inner member. The stationary rim is rigidly coupled to, or is integral to, the receptacle housing. The connector is rigidly coupled to the suspended inner member. The stationary rim and suspended inner member are resiliently coupled along the substantially annular interstice between the rim and the member. It is contemplated the interstitial edges of the stationary rim and suspended inner member can abut or overlap. The resilient coupling can include one or more elastomeric materials or springs as further described herein. In an embodiment, the resilient coupling can be a captured o-ring. The floating connector may include a floating member having a connector fixedly disposed therethrough, the connector including a mating end adapted to couple to a mating connector and a mounting end which mounts to the floating member. The floating connector may further include a support member having an opening defined therein, the opening including an internal dimension greater than the mounting end of the connector to define a clearance between the opening and the mounting end of the connector, the floating member and the connector being positioned in substantial concentric alignment with the opening. The floating connector also includes an elastomeric coupling fixedly disposed between the floating member and the support member.

0009According to a further embodiment of the present disclosure, the floating connector assembly may include a resilient spring mounting plate, which further includes an outer stationary rim and suspended inner member that are coupled by at least one thin resilient beam. The beam is attached at one end to the stationary rim and at the other end to the suspended inner member. The rim, the member and the resilient beams can be a single piece formed by, for example, stamping, injection molding, laser cutting, water jet machining, chemical machining, blanking, fine blanking, compression molding, or extrusion with secondary machining. The spring plate can include at least one slot defining a floating region concentrically disposed within a fixed region, the slots further defining the spring beam. The spring beam couples the floating region and the fixed region. The spring plate further includes a connector fixedly disposed therethrough. The connector includes a mating end adapted to couple to a mating connector and a mounting end which mounts to the floating region of the spring plate.

0010The mounting assembly may include a support member having an opening defined therein, the opening including an internal dimension greater than the mounting end of the connector to define a clearance between the opening and the mounting end of the connector, the spring plate and the connector being positioned in substantial concentric alignment with the opening. The floating connector includes a collar for securing the spring plate to the support member, the collar further including an aperture defined therein having an internal dimension greater than the mating end of the connector to define a second clearance between the aperture and the mating end of the connector, and at least one coupling device which attaches the collar and the spring plate to the support member.

<u style="single">BRIEF DESCRIPTION OF THE DRAWINGS</u>

0011The above and other aspects, features, and advantages of the present disclosure will become more apparent in light of the following detailed description when taken in conjunction with the accompanying drawings in which: <ul id="ul0001" list-style="none" compact="compact"><li><figref idref="f0001">Fig. 1</figref> is an oblique view of an embodiment of a floating connector in accordance with the present disclosure;</li><li><figref idref="f0001">Fig. 2</figref> is an exploded view of an embodiment of the floating connector of <figref idref="f0001">Fig. 1</figref> having a resilient mounting plate, circular connector, and coaxial connector;</li><li><figref idref="f0002">Fig. 3</figref> is an enlarged view of the resilient spring mounting plate of <figref idref="f0001">Fig. 2</figref>;</li><li><figref idref="f0002">Fig. 4</figref> is an enlarged view of a circular connector mounted atop the resilient spring mounting plate of <figref idref="f0002">Fig. 3</figref>;</li><li><figref idref="f0003">Fig. 5A</figref> is a side cross sectional view of one embodiment of the floating connector in accordance with the present disclosure;</li><li><figref idref="f0003">Fig. 5B</figref> is a top view of one embodiment of the floating connector in accordance with the present disclosure;</li><li><figref idref="f0004">Fig. 6A</figref> is a side cross sectional view of another embodiment of the floating connector in accordance with the present disclosure showing a floating member resiliently coupled to a support member in a substantially overlapping configuration;</li><li><figref idref="f0004">Fig. 6B</figref> is a top view of the embodiment of the floating connector shown in <figref idref="f0004">Fig. 6A</figref> in accordance with the present disclosure;</li><li><figref idref="f0005">Fig. 7A</figref> is a side view of still another embodiment of the floating connector in accordance with the present disclosure showing a floating member resiliently coupled to a support member and configured to limit movement to a single axis of motion;</li><li><figref idref="f0005">Fig. 7B</figref> is a top view of the embodiment of the floating connector shown in <figref idref="f0005">Fig. 7A</figref> in accordance with the present disclosure;</li><li><figref idref="f0006">Fig. 8A</figref> is a side view of yet another embodiment of the floating connector in accordance with the present disclosure showing a floating member and support member in a substantially abutting configuration having a positive stop member;</li><li><figref idref="f0006">Fig. 8B</figref> is a top view of the embodiment of the floating connector shown in <figref idref="f0006">Fig. 8A</figref> in accordance with the present disclosure;</li><li><figref idref="f0006">Fig. 8C</figref> is a bottom view of the embodiment of the floating connector shown in <figref idref="f0006">Fig. 8A</figref> in accordance with the present disclosure;</li><li><figref idref="f0007">Fig. 9</figref> is a side view of still another embodiment of the floating connector in accordance with the present disclosure showing a floating member resiliently coupled to a support member by a captured o-ring, and having a positive stop member; and</li><li><figref idref="f0008">Figs. 10A-10C</figref> are side views illustrating the coupling and uncoupling of the floating connector with a connector assembly.</li></ul>

<u style="single">DETAILED DESCRIPTION</u>

0012Particular embodiments of the present disclosure will be described herein with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid obscuring the present disclosure with unnecessary detail. References to connector gender presented herein are for illustrative purposes only, and embodiments are envisioned wherein the various components described can be any of male, female, hermaphroditic, or sexless gender. Likewise, references to circular and coaxial connectors are illustrative in nature, and other connector types, shapes and configurations are contemplated within the present disclosure.

0013Referring to <figref idref="f0001">Fig. 1</figref>, there is disclosed a floating connector assembly 100 that includes support member 110 having an outer surface 111 and an inner surface 112. Support member 110 further includes a coaxial connector 160 fixedly mounted thereto in spaced relation relative to floating connector 120, Floating connector 120 is fixedly mounted to support member 110 by a coupling device 150, as will be described in detail below. Coaxial connector 160 may be mounted to support member 110 by any suitable means such as by a nut or a clip (not shown) as is well-known in the art. The spaced relationship of floating connector 120 to coaxial connector 160 substantially mirrors the spaced relationship of a corresponding mating connector assembly 790, shown by example in <figref idref="f0008">Figs. 10A-C</figref>, wherein male circular connector 780 is configured to matingly engage female circular connector 740 and coaxial connector 785 is configured to matingly engage coaxial connector 760.

0014With reference to <figref idref="f0001">Fig. 2</figref>, floating connector 120 includes a collar 130 and a female circular connector 140 which is configured to floatably mount within floating connector 120 as will be further described herein. Female circular connector 140 can be of a keyed type such as an Odu^™ or LEMO^™ connector as will be familiar to the skilled artisan. Support member 110 and collar 130 further include openings 115 and 135, defined therein respectively, dimensioned to permit floating movement of, and accommodate electrical and/or fluidic connections to, female circular connector 140.

0015Floating connector 120 further includes a spring plate 200 having an arrangement of slots 250, 250', 270, 270' defined thereon which, in turn, are arranged to define a fixed region 210 and a floating region 220 having spring beams 280 disposed therebetween (see <figref idref="f0002">Fig. 3</figref>), Spring plate 200 can be constructed of any material having spring-like properties, such a spring steel or a resilient polymer, and can be formed by any suitable means, such as stamping, injection molding, laser machining, water jet machining, or chemical machining. A recess 114 is disposed upon outer surface 111 and located around the perimeter of opening 115, and is dimensioned to provide floating movement of spring plate 200 sufficient to enable proper coupling of connector 140 with a mating connector. As can be readily appreciated, recess 114 also prevents excessive inward movement of spring plate 200 to enable sufficient mating forces to be generated during coupling, and also to prevent exceeding the elastic limits of spring plate 200.

0016As best seen in <figref idref="f0002">Fig.3</figref>, floating region 220 further includes a centrally disposed mounting hole 260 defined therein dimensioned to receive a mounting boss 142 of female circular connector 140. In one embodiment, mounting hole 260 is substantially circular and includes opposing flat areas 265 dimensioned to accept mounting boss 142 having corresponding opposing flat areas (not shown) to inhibit unintended rotation of female circular connector 140 within mounting hole 260, as is well-known in the art. Female circular connector 140 can be retained to spring plate 200 by a nut 145, as shown in <figref idref="f0003">Figs. 5A and 5B</figref>, or may be retained by any suitable means such as integral clip, external clip, or adhesive, Slots 250, 250' further describe stops 240, 240' for limiting the range of motion of floating member 220 along the X-axis, the Y-axis, the Z-axis, and/or rotationally about the Z-axis (i.e. longitudinal axis) of female circular connector 140.

0017With reference now to <figref idref="f0002">Figs. 4</figref>, <figref idref="f0003">5A, and 5B</figref>, female circular connector 140 of spring plate 200 is sandwiched between collar 130 and support member 110 in substantial coaxial alignment with opening 115 and opening 135. Collar 130 and spring plate 200 are affixed to support member 110 by a coupling devices 150 which can be threaded fasteners, rivets, adhesive, bonding, or other suitable coupling devices. By this configuration, spring beams 280 and/or the overall resilient properties of spring plate 200 afford circular connector 140 a range of movement within openings 115 and 135 and recess 114, for example, along the X-axis (left-right), the Y-axis (up-down), the Z-axis (in-out), and/or rotationally about the Z-axis (roll).

0018By way of example, <figref idref="f0008">Figs. 10A-10C</figref> show a schematic illustration of the coupling and uncoupling of the connector assembly with floating connector assembly 700. In particular, <figref idref="f0008">Fig. 10A</figref> shows male circular connector 780 poised to mate with female circular connector 740, wherein the longitudinal axis of male circular connector 780 is misaligned by an illustrative angle 750 with respect to longitudinal axis Z of circular connector 740. In <figref idref="f0008">Fig. 10B</figref>, as the connector assemblies are joined, coaxial connectors 785 and 760, which are fixed to their respective support members, couple normally, while male circular connector 780, which is imprecisely aligned with circular connector 740, causes spring beams 720 (see <figref idref="f0002">Fig. 3</figref>) and/or spring plate 710 to deflect in response to the coupling forces applied by male circular connector 780 to circular connector 740. This permits female circular connector 740 to move into substantial alignment with male circular connector 780 as the connectors are brought into a fully-coupled state. In this manner, the desired coupling of two connectors 740 and 780, which were originally misaligned, is achieved without the interference or binding which would normally be encountered with such initial misalignment and/or imprecise alignment. Turning now to <figref idref="f0008">Fig. 10C</figref>, as the connector assemblies are decoupled, male circular connector 780 parts from circular connector 740, enabling spring beams 720 and/or the overall resilient properties of spring plate 710 0 to bias circular connector 740 back to its original position, i.e., into substantially orthogonal alignment with support member 705.

0019Other embodiments contemplated by the present disclosure are shown with reference to <figref idref="f0004 f0005 f0006 f0007">Fig. 6A - Fig. 9</figref>. <figref idref="f0004">Figs. 6A and 6B</figref> show one embodiment of a floating connector having a floating assembly 305 which includes a female circular connector 340 that is fixedly mounted to a floating member 300 though an opening 302 provided therein. The opening 302 is dimensioned to accept a mounting boss 342 of circular connector 340 as previously described herein. Floating member 300 is concentrically aligned with an opening 315 defined in a support member 310, and is further dimensioned to extend at the perimeter thereof beyond the edge of opening 315. An elastomeric coupling 320 is adhesively disposed between floating member 300 and support member 310 along the perimetric interstice defined by the overlap therebetween. Elastomeric coupling 320 may be formed from any suitable resilient material, such as rubber, neoprene, nitrile, silicone, foam rubber, or polyurethane foam. Additionally or optionally, elastomeric coupling 320 can include bellows-like corrugations to alter the resilient properties thereof.

0020<figref idref="f0005">Figs. 7A and 7B</figref> show another embodiment of a floating connector in accordance with the present disclosure wherein the motion of a floating assembly 405 is substantially limited to a single axis of motion. A plurality of bar-shaped elastomeric couplings 420 are adhesively disposed between a floating member 400 and a support member 410, and are arranged in mutually parallel configuration and generally orthogonal to the desired axis of motion. The range of motion of floating assembly 405 is dictated by the shape and arrangement of at least one bar-shaped coupling 420. Other embodiments are envisioned which include, for example, elastomeric couplings of other shapes and arrangements, including without limitation square-shaped or dot-shaped elastomeric couplings in a lattice arrangement.

0021Turning now to <figref idref="f0006">Figs. 8A, 8B, and 8C</figref>, another embodiment in accordance with the present disclosure is provided wherein a floating member 520 is concentrically disposed within an opening 525 defined in a support member 510, the opening having a stationary rim 528 that is rigidly coupled to, or is integral to, support member 510. A floating assembly 505 includes a connector 540 that is rigidly coupled to the floating member 520. Stationary rim 528 and floating member 520 are resiliently coupled along their angular interstice by an elastomeric coupling 530 that is adhesively disposed between stationary rim 528 and floating member 520. The overall resilient properties of elastomeric coupling 530 afford floating assembly 505, and particularly, circular connector 540, a range of movement to permit coupling with a misaligned mating connector, such as connector 780, as previously described herein. Optionally, a positive stop 560 is included for limiting the inward excursion of floating assembly 505 along the Z-axis during coupling to allow sufficient mating force to be generated when coupling the connectors 540 with, for example, connector 780. In one embodiment, positive stop 560 has an annular shape and is fixedly disposed in concentric relation to floating assembly 505 at an inner surface 512 of support member 510 along the perimeter of opening 525. Positive stop 560 can also include a standoff 562 which can be formed integrally with positive stop 560 for dictating the maximum inward displacement of floating assembly 505.

0022In another embodiment as illustrated in <figref idref="f0007">Fig. 9</figref>, a stationary rim 628 and a floating member 620 are joined along their annular interstice by a captured o-ring 650. A floating assembly 605 includes a connector 640 that is rigidly coupled to the floating member 620. The captured o-ring 650 may be formed from any suitable resilient material, such as rubber, neoprene, nitrile, or silicone, and is compressively retained within opposing semicircular saddles 624 and 626 formed in the circumferential edges of opening 625 and floating member 620, respectively. Upon coupling, the captured o-ring 650 can deform and/or partially roll in response to the mating forces applied to connector 640, and in this manner, permit connector 640 to move into substantial alignment a misaligned mating connector, for example, connector 780, as the connectors are brought into a fully-coupled state.

0023The described embodiments of the present disclosure are intended to be illustrative rather than restrictive, and are not intended to represent every embodiment, of the present disclosure. Further variations of the above-disclosed embodiments and other features and functions, or alternatives thereof, may be made or desirably combined into many other different systems or applications without departing from the spirit or scope of the disclosure as set forth in the following claims both literally and in equivalents recognized in law.