Apparatus for effecting anastomosis of body members

Background of the Invention

The present invention is in the field of surgical apparatus and methods and is more specifically directed to apparatus and methods for effecting a radical prostatectomy which avoids the shortcomings of the prior known procedures for such operations. The invention is also intended for general use in tubular anastomosis.

Impotence frequently results from radical prostatectomy operations as a consequence of injury to the branches of the pelvic plexus that are necessary for the sexual function. Additionally, incontinence is also regrettably a frequent occurrence resulting from prior known radical prostatectomy procedures. The occurrence of most cases of impotence and incontinence arises as a consequence of three factors inherent in present procedures. The first factor the presently employed surgical procedures involved in the anastomosis of the distal urethra and the bladder neck results in trauma and injury to the nerves adjacent the apex of the prostate and the urethra. The second factor is post-operative leakage resultant from the fact that the anastomosis is frequently not liquid-tight so that urine leaks outside the anastomosis, resulting in scarring and distortion of the bladder neck with possible encasement of the nerves. The third factor is obstructions from intralumenal bladder neck contracture.

The prior procedures! for effecting anastomosis require the surgeon to suture the urethra in a blind area beneath the symphysis pubis in which it is not possible to see the area being sutured. Consequently, imperfect anastomosis and nerve damage frequently result. Moreover, the prior known surgical procedures employed in the anastomosis suffer from the further shortcoming of being extremely time consuming and tedious, factors which decrease the surgeon's skill and the patent's stamina.

While prior devices such as that shown in U.S. Patents Nos. 4,304,236, 4,485,817 and 4,553,543 have ‘been proposed for performing anastomosis of large body ducts or lumens such as the bowel, such devices are not usable for joining the smaller body tubes such as the urethra due, among other things, to their large size and the fact that they cannot be scaled down to a sufficiently small size as to be usable in the urethra.

Summary of the Invention

The present invention overcomes the aforementioned shortcomings of the prior apparatus and procedures through the provision of a unique apparatus and mothod for reconnecting the distal urethra to the bladder neck with a minimum trauma to the branches of the pelvic plexus controlling the sexual function and with almost certain avoidance of urine leakage following the anastomosis. More specifically, a urethral sound of hollow tubular construction is provided with a threaded socket on one end which is passed inwardly along the length of the penile urethra to a position adjacent the apex of the prostate. The dorsal vein is ligated and transected and a urethrotomy is performed to permit the threaded socket end portion of the urethral sound to pass outwardly of the urethra. Following positioning of the end of. the urethral sound externally to the urethra, a rounded guide tip is removed from the threaded socket and an inflatable anvil assembly which includes an annular connector component mounted on a support portion is threaded into the threaded socket on the end of the urethral sound. The inflatable anvil component is sufficiently small as to be fitable in the urethra upon a partial withdrawal movement of the urethral sound. A rigid core tube extends outwardly from the urethrotomy and the urethra is then sutured about the core tube and the urethra is transected between the suture and the prostate. The severed end of the dorsal vein complex and the prostate are then dissected retrograde toward the bladder neck to leave a relatively large opening in the bladder wall. A drainage catheter has one end threadably attached to the outer end of the core tube. The core tube which extends from the inflatable anvil, and the attached drainage catheter are then positioned in the opening in the bladder wall and the bladder wall is then sutured together to provide an annular

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J bladder duct encircling the core tube. Pressurized sterile fluid is injected through the urethral sound and the core tube to inflate and rigidify the inflatable anvil. A first annular j connector component formed of soluble material which will | dissolve in the body after a certain number of days is | positioned on the inflatable anvil.

i 1 ! A cystotomy is then provided in the bladder upwardly above ' the area in which the core tube is positioned and an elongated housing of a second operator is moved downwardly through the li access opening. The second operator includes an internal

I support tube having an opening in which the core tube end can be matingly received. Further, mating lug and slot means on l. the core tube and the support tube ensure proper alignment of !! the core tube and the support tube. A drive tube is mounted j inside the elongated housing for reciprocation on the support .: tube and includes means for supporting a second annular connector component formed of the same soluble materials as the first annular connector component. One of the annular connector components includes female socket openings mounted about an annular base plate which receive male prongs extending | from an annular base plate of the other connector component, ii The drive tube is actuated to move the second connector u

Ij component forwardly so that the male prongs are inserted in the female sockets and the circular base plates of each of the connector components press the annular bladder tissue against the urethral tissue formed at the transection of the urethra. During the aforementioned procedures, the rigid anvil provides ί a backing for the connector component mounted on it to prevent ί movement of the connector component which would otherwise occur during the clamping of the tissue and connection of the connector components. The male prongs and female sockets have mutually engageable retention means which prevent the male prongs from being withdrawn from the female sockets after ί insertion so that the joined portions of the urethra and the bladder are clamped together and held together in an annular j manner about a 360 degree circle to ensure that a non-leaking fluid tight connection is effected. Additionally, a circular blade provided on the drive tube severs inner circular portions of the tissue to provide tissue specimens which are later usable for biopsy purposes.

After the urethra and the bladder Sections have been joined, the second operator is withdrawn outwardly through the access opening in the bladder which is then closed by conventional suturing techniques. The fluid pressure in the inflatable anvil is then vented through the urethral sound to deflate the anvil and the urethral sound is then withdrawn from the urethra and carries the deflated anvil with it. Additionally, the outer end of the drainage catheter which had been attached to the end of the core tube and positioned in the bladder prior to closure of the opening in the bladder is withdrawn outwardly through the urethra until its outer end is fully clear of the outer end of the urethra with its inner end remaining in the bladder to provide bladder drainage.

The entire procedure is effected with a minimum chance of damage to the sexual function controlling nerves and with an optimum likelihood of securing a fluid tight connection between the urethra and the bladder. Moreover, the entire procedure can be performed much more quickly than is possible with present known apparatus aad=aethoda.

Brief Description of the Drawings

Figure 1A is a perspective view of the human prostate, bladder and associated organs illustrating an initial step in practice of the invention by the preferred embodiment thereof;

Figure IB illustrates a subsequent step to that of Figure 1A in the practice of the inventive method;

Figure 1C illustrates a step subsequent to the step of Figure IB in the inventive method;

Figure ID illustrates a step subsequent to that of Figure 1C;

Figure IE illustrates a step subsequent to that of Figure ID;

il connector effecting means away_from the juncture of the urethra |! and the bladder wall following the connection effecting step ;! illustrated in Figure 11;

Ί ; Figure 13 is an enlarged bisecting sectional view of the ;! connection between the posterior end of the urethra and the 11 bladder; and

I; Figure 14 is a sectional view taken along the lines 14-14 1' of Figure 10.

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Π Description of the Preferred Embodimentj h .

; Attention is initially invited to Figure 2 which ! h1 j illustrates the different parts of the invention in a pictorial j manner and which includes six major components 10, 23, 26, 28, ! 30 1׳ and 32.

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H More specifically, the main components include an ' h 1 ׳ j externally manipulated operator 10 and which consists of anI

H elongated rigid hollow tubular catheter or urethral sound 12j i having an axial passageway 11 and a threaded aperture or socketi ! 13 at its outer or distal end in which a removable rounded-end;

j; tip 14 is mounted. A spool valve 16 is connected by a ij connector 18 to the opposite end of the elongated hollow I!

;1 catheter or urethral sound 12 and is connected on an opposite 'i| side to a syringe or other piston-cylinder means 20 (or other j t jl pressure/vacuum means) including an outer cylinder and an j internal piston member actuated by an outer thumb know 22 which i can be moved axially within the syringe 20 to force fluid therein through valve 16 and then into the elongated hollow catheter 12 for a purpose to be discussed. Also, it should be noted that fluid forced into the catheter 12 can be retained therein by closure of a valve actuator member 17 in an obvious manner.

Other features of the preferred embodiment include an inflatable anvil assembly which is generally designated 23 in Figure 2 and which is connectable to the threaded socket 13 of the elongated hollow urethral sound 12 following removal of the rounded-end tip member 14. More specifically, the inflatable anvil assembly 23 includes an elongated rigid hollow anvil core tube 24 having a threaded end portion 25 which is connectable to the threads in socket 13 in the outer end of the hollow tube member 12 after the tip member 14 has been removed so as to provide communication between the passageway 11 in tube 12 and an internal bore 73 in core tube 24. Hollow anvil tube 24 also includes an outer threaded socket 25' in the outer end portion of tube 24.

Member 30 comprises a conventional flexible catheter having a threaded connector 31 on one end of which is engageable with the threaded socket 25' in the outer end of the hollow core tube 24.

Lastly, a connector actuator 32 includes a main tubular housing 34 having a distal end 33 which is connectable with alignment means on the outer end of the inflatable anvil core tube in a manner to be described in detail. Actuator 32 is manually activated for effecting connection of the urethra to the bladder by male and female connector means to be discussed. During such actuation, the actuator is coupled to inflatable anvil assembly 23 which is in turn coupled to member 12.

Additionally, the preferred embodiment also includes a circular female connector component 26, and a circular male connector component 28 which two components, 26 and 28, are made of soluble material. The male connector component 28 is engageable with the circular female connector component 26 for connecting the severed end of the urethra to the bladder in a manner to be discussed in detail hereinafter.

The female and male connector components 26 and 28 are both made of a biodegradable soluble material which eventually dissolves in the human body, such as the soluble suture material manufactured by Ethicon, Inc. of Somerville, New Jersey. Other biodegradable polymers that may be used for components 26 and 18 are disclosed in U.S. Patents 3,297,033; 3,463,158; 3,597,449; 3,620,218 and 3,875,937. Initial reference is made to Figures 3, 4 and 5 which illustrate the female connector component 26, The female connector component ί 26 comprises an annular base plate 36 having an inner surface 38 ף defining a flow-through opening and an¹ outer surface 40.

The annular base plate 36 also has a mounting face 42 from j |j which mounting and positioning pins 44 extend and from which j '1 female connector socket tubes 46 also extend with their axes , il perpendicular to the plane of the annular base plate 36. The J face of the annular base plate 36 opposite the mounting face 42 .i comprises a clamping face 48 from which guide cones 50 extend !

in axial alignment with respective ones of the female connector j tubes 46 with each guide cone including a flared conical ן :! surface 52 which is larger at its outer end (the end spaced the j. ! greatest distance from clamping face 48) and which merges at i i its inner end with a respective one of openings 47 extending I ! through each respective female connector tube 46. One-way ף annular lock ribs 53 are provided on the interior of each axial ! !׳ opening 47 in each tube 46 as shown in Figure 10.

B Additionally, four oval clamping dimples 54 extend outwardly | from the clamping face 48.

i The circular male connector component 28 illustrated in Figures 6, 7 and 8 includes an annular base plate 56 which is of the same size and shape as annular base plate 36 of the ; female connector and includes an inner surface 58 defining an !i opening in alignment with (when mounted in the assembly) and in I : i 1 ף exactly the same size as the opening defined in the base plate ! ί 36 by surface 38. The annular base plate 36 includes a [ mounting face 60 from which four mounting and positioning pins | 62 extend. An opposite clamping face 64 is provided with four ' outwardly extending male connector pins 66 each having a i plurality of conical flanges each defining a circular outer lip ! 68 having a diameter slightly greater than the diameter of the j i one-way annular lock ribs 53 extending the length of the female | 1 connector tubes 46, but not being deflectable during insertion ί of the male connector pins through the opening 47 in the female p connector tube. After insertion of the male connector pins, | ribs 53 and lips 68 interact to prevent removal of the connector pins 66 from the female connector tubes 46. Additionally, clamping face 64 also includes four oval clamping dimples 70 which are of identical size and shape to that of ! dimples 54 of the female connector. The dimples 70 are positioned to face the flat surface 48 of the female connector j component 26 and are not in alignment with the dimples 54 of ί the female connector component when the female and male j connector components are connected together in a manner to be j discussed.

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ij The rigid anvil core tube 24 of the inflatable anvil I assembly 23 has axial bore 73 which communicates with a l plurality of radial bores 92 found in core tube 24. A ring || seal 76 is provided between the end of the elongated hollow ii tube 12 and a shoulder 78 on the outer surface of tube 24 as ji best shown in Figure 12 for example. An inflatable anvil ! bladder 80 encircles the tube 24 and has a base end 82 ; positioned in a recessed seat 84 provided in the outer surface ii of the core tube 24 with a clamp band 86 clamping the base in ;; 82 in a pressure resistant manner to the outer surface of the tube 72 as shown in Figure 12. The inflatable anvil bladder 80 ; is unitarily formed preferably of polyethylene material such as j that used in inflatable catheters sold by American Edwards | Laboratories of Santa Ana, California, and includes major ij components comprising an outer envelope 81, a radial annular j| clamp portion 83 and in an interior envelope 88 which is 1' generally of conical configuration when the anvil bladder is in ! its inflated rigid condition illustrated in Figure 10. The j inner end 90 of the interior envelope portion 88 is molded to H the outer surface of core tube 24 and is normally in a ן ן tensioned condition so as to maintain a fluid tight seal (under !1 high pressure) between the inner end 90 and the outer surface j of tube 24. Alternatively, a metal clamp could also be used j for clamping end 90 to the outer surface of core tube 24 if desired.

Radial apertures 92 are provided in tube 24 to provide pressure-vacuum communication with the axial bore internal passageway 73 so that fluid provided into the passageway 73 flows outwardly into the space between the inner surface of the outer envelope 81 and the interior envelope 88 and the outer surface of the tube 24 between the sealed portions 82 and 90 as shown in Figure 10. Additionally, mounting sockets 93 are sized and positioned to receive the positioning pins 44 of the circular female connector 26 for holding same in position for

I permitting connection of the male connector as will be ! discussed.

I Additionally, the inflatable anvil bladder 80 includes I radial strengthening vanes 95 molded to tube 24 as shown in

I Figure 14; however, it should be understood that vanes 95 are J optional and may not be essential to successful operation of j! the device. Further, an alignment lug 108, is provided near i the outer end of the metal tube 24 for engagement with a mating ; slot 110 provided in an internal support sleeve 112 of the !! actuator device 32. Radial bore 100 provided at the outer end I of axial bore 73 communicates with an annular space within the confines of an annular locking bladder 96 which is clamped in a H grove 102 at opposite ends by clamp members 104 and 106 (Figure / 11) so that pressure introduced into bore 73 tends to bulge the ¹i annular locking bladder 96 outwardly for a purpose to be

II discussed.

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! Internal support sleeve 112 of the actuator 32 is fixedly !j and axially positioned within an enlarged head 33 provided on t ן

J the end of a main tubular housing 34 of actuator 32 and provides support for a sliding drive tube 114 which is mounted on sleeve 112 for reciprocation between two positions respectively illustrated in Figures 10 and 11. It will be observed that drive tube 114 includes a slot 116 in which a stop pin 118 is positioned for limiting the extent of movement ! of the drive tube 114. A cylindrical blade 120, having a sharp H circular outer edge 122, is attached to the forward end of the ! j drive tube 114 for movement therewith. The outer diameter of the circular blade 120 is slightly less than the inner diameter of the opening provided in the male connector member 28 and the head 33 is provided with a plurality of pin receiving support openings 124 for receiving the pins 62 of the male connector members so that the male connector pins 66 are supported in axial alignment with the openings 47 of the female connector members.

The drive tube 114 is reciprocated by conventional drive 1 means such as, for example, drive means employed in existing surgical stapler devices. An example of a satisfactory drive means is that shown in U.S. Patent No. 4,304,236 for driving tube 50 of said patent. Alternatively, a dual-handle drive assembly as shown in phantom in Figure 2 or a hydraulic system similar to that of U.S. Patent No. 4,485,817 or a mechanical system as in U.S. Patent No. 4,204,623 could be employed.

The manner of using the inventive apparatus will now be discussed with initial reference being made to Figure 1A. The patient will be anesthetized and the removable rounded-end tip 14 will be threaded into the end of the elongated urethral sound 12. Conventional surgical techniques employing a verticle infra umbilical incision will be employed to render the bladder B and the urethra U accessible to the surgeon as shown in Figure 1A. Elongated hollow urethral sound 12 will then be inserted externally from the outer end of the urethra through the urethra to a position substantially, as shown in Figure 1A, but will be inside the urethra with the forward end 14 extending into the apex of the prostate P. Dorsal vein V is then ligated and transected and an initial urethrotomy 130 is then provided in the urethra of sufficient size to permit the end tip 14 and the outer portion of urethral sound 12 to be pushed outwardly through the urethrotomy 130, as shown in Figure 1A; however, it should be understood that the urethra is not completely transected at this time. The removable roundedend tip member 14 is then removed from the tube 12 and will not be of any further use in the procedure.

The deflated inflatable anvil assembly 23 and a female connector component 26 mounted thereon are then threaded into the internally threaded socket 13. The urethral sound 12 is then moved outwardly and the assembly is manipulated to fully position the inflatable means 81, 88 of the inflatable anvil assembly 23 inside the urethra with the end of core tube 24 protruding outwardly through the urethrotomy 130, as shown in Figure IB. The urethra is snugly engaged with the outer surface of protruding core tube 24 by a suture, as shown at 132, with the end of core tube 24 extending outwardly beyond the urethra. Catheter 30 is then threaded into socket 13 and the urethra is completely severed to provide a severed end 130 as shown in Figure 1C. The prostate is then peeled back toward the head end and the distal vein complex C and the prostate are ί! severed from the bladder to leave an elongated opening having :! sides 136 and 138 as shown in Figure 1C.

ii i| A cystotomy 140 is provided in an upper portion of the Ϊ! bladder B and the actuator housing 34 is passed downwardly J through the cystotomy to position head 33 and a male connector :! component 28 mounted therein in the bladder shown in Figure ID. J The area inside the head 33 of the actuator will be as shown in ;! Figure 10 with the male connector member 28 being positioned ; within the head. The end of the catheter will then be passed ^:: upwardly into the internal sleeve 112 and alignment lug 108 will be positioned in slot 110 to insure the male connector J pins of the male connector component 28 are axially aligned H with the openings 47 in the female connector component 26.

Valve 16 is then opened and syringe 20 actuated to force i! fluid 94, such as a sterile saline solution, through the tubes . 12 and 24 to inflate the inflatable anvil bladder 80 so that it י assumes the shape shown in Figure 10. Inflation of anvil | bladder 80 causes the bladder to expand outwardly to radially i! distend the urethra against the dorsal vein to effect substantial compressive closure of the vein and permit : relegation of the vein if necessary. Optionally, the initial r ligation and transection of the dorsal vein can be performed at Π ;. this time instead of immediately following the urethral sound i as discussed above, i

Injection of fluid into core tube 24 will also cause the annular locking bladder 96 to bulge outwardly into contact with the inner surface of internal sleeve 112 to rigidly lock members 24 and 112 together so as to prevent any relative axial movement of core tube 24 relative to sleeve 112. Valve 16 will then be closed to maintain pressure inside the anvil member so that it remains in its inflated condition. The male connector 28 is consequently insured of remaining in proper alignment with the female connector 26 by virtue of the fact that the positioning of lug 108 in slot 110 cannot be discontinued.

I Suturing of the sides 136 and 138 together is completed to provide an opening through the bladder wall which is in the form of a circular neck portion of bladder tissue 148 engaging the outer surface of core tube 24 as shown in Figure 1. Similarly, the urethra has tissue portions 150 engaging the outer surface of core tube 24 and resting against annular stop 98, fixed to tube 24 as shown in Figure 10. The entire assembly is consequently ready for actuation to effect a connection between the bladder and the urethra.

The conventional drive means in actuator 32 is then actuated to cause the drive tube 114 to move to the left in the direction of arrow A in Figure 11 from its position on support tube 112 in Figure 10 to the position shown in Figure 11. Such movement affects two very important operations. Firstly, the male connector member is forcefully moved so that the male connector pins 66 penetrates the bladder and the urethral tissue and then moves into and through the openings in the female connector tubes 46 and are locked therein so as to clamp the bladder to the end of the urethra. Secondly, the movement of the circular blade 120 severs the portions 148 and 150 of the bladder and urethra, to respectively provide smooth edge surfaces 158 and 160, respectively, and the severed portions move into the interior of the blade as shown in Figure 11 where they remain for subsequent availability in biopsy purposes if desired. In addition, the cutter removes tissue in a circular fashion providing a clean-cut interior lumenal circumference for the anastomosis which would minimize flow obstruction and maintain a superior hydraulic radius to flow.

Valve 16 is then opened and syringe 20 actuated to withdraw the fluid from inside the inflatable anvil bladder 80 and the annular locking bladder 96. Actuator 32 is withdrawn through the access opening 140 and the opening is sutured or stapled together as shown at 151. The urethral sound 12 is then moved outwardly through the urethra with such movement pulling the anvil assembly 23 and catheter 30 outwardly with the sound. Outward movement of the urethral sound 12 is terminated after connector 31 clears the urethra meatus and the connector 31 is disconnected from the threaded socket 25 so as to leave the catheter 30 in position for effecting bladder drainage. After several days, the catheter 30 can be removed in a well known manner. The male and female urethra and bladder have grown together to provide a permanent connection therebetween.

While the preferred embodiment of the invention is directed to prostate removal, it should be understood that the spirit and scope of the invention is not limited to prostate operations. In fact, the inventive apparatus and method can be employed for joining other tubular body parts such as the esophagus, intestines, urethra, bowel ducts and the like. Also, the invention can be employed for joining the urethra of females to repair traumatic injury such as may occur in accidents or occasionally in childbirth.