Self-cleansing bladder drainage device

Abstract: An urethral drain having deep external drainage channels, a low-profiled bladder retention segment, and a reversibly detachable collection segment, facilitates the draining of urine and fluids from the bladder. The low-profiled retention means minimizes bladder irritations and the deep external channels reduce the occurrence of infections. Incorporation of a reduced diameter smooth segment on the catheter, proximate the location of the external urethral sphincter allows the patient to void normally and at will. Modifying the size of this smooth segment aids the function of a defective sphincter in controlling urine leakage. The drain can be worn concealed within the urethra. Flushing action from normal voiding washes out particulate matters in the urethra and the concealed drain further minimizes contamination. Together, these features improve quality of life for patients needing catheterization.

Description: This invention relates generally to body fluid drainage devices, and more particularly to a urinary drain having improved performance characteristics. Urethral catheters, such as the Foley catheter, now used for bladder drainage are essentially elongated tubular structures placed in the urethra for draining urine through the central lumen thereof. Near the distal end of the tube is an inflatable balloon which, when inflated while in the bladder, allows the catheter to be held in place. Its proximal end has a drainage port as well as a balloon inflation port. The proximal end of the catheter protrudes beyond the urethral orifice and can be attached to a bag receptacle for the collection of the near constantly dripping urine from the bladder. The collection bag is either attached to the patient's leg when the patient is ambulatory, or to the side of the bed during bed rest. At times, a plug is used in place of the bag to stop the leakage of urine from the catheter tip. When Foley catheters or the like are used, patients are not able to void when they want to. Rather, urine is continuously drained from the bladder through the central lumen of the elongated tube and into the collection bag. Ambulatory patients are therefore obligated to have the leg bag attached to their leg, and this poses a source of great inconvenience, unsightliness and problems affecting their quality of life. Due to the fact that urine is continuously being drained from the bladder, the bladder is continuously near empty. The dome of the bladder, therefore, rests continuously on the water-filled bulging balloon retention part of the Foley catheter, causing tissue compression, irritation and erosion related adverse side effect problems. Furthermore, increased urinary tract infection is common with patients using such catheters, especially when used on a chronic basis. Though the casual factors have not been precisely identified, length of time of catheterization has been associated with an increased frequency and severity of urinary tract infection, presumably due to the migration of bacteria up the urethral tract. Frequently, yellow encrusted and mucoid proteinaceous depositions containing bacteria are found on the surfaces of the catheter with much higher concentration on the inner lumen surfaces. The mandated usage of urine receptacles causes additional associated stigma of soiled clothing, furniture and odor. US 4501580 discloses an indwelling catheter with an inflatable balloon retention mechanism for retaining the distal end of the catheter within the bladder, and a central lumen for conveying urine from the distal end within the bladder to a proximal end outside the body. The catheter also includes a second lumen which delivers antiseptic fluid from the proximal end of the catheter to an external irrigation channel on the outside surface of the catheter which extends from a position short of the balloon, to the proximal end. The second lumen and irrigation channel facilitates washing of the outside surface of the catheter while it is indwelling. US 3815608 discloses in Figure 9 thereof a typical Foley urinary catheter having an inflatable balloon 64 for retaining the distal end portion of the catheter with its drainage hole 56 within the urinary bladder. An alternative embodiment disclosed in Figures 6 and 7 of US 3815608 depicts a urinary catheter that uses a helically threaded region thereof as the retention means in place of an inflatable balloon. This device still relies upon the central lumen 46 as the urine path while the channels 48 defined between the helical threads 44 allow for "drainage of exudate discharged from the prostate gland". SUMMARY OF THE INVENTION The present invention provides a solution to increase the quality of life for patients who require drainage catheters by solving compression and irritation related problems, giving patients an option to carry on their daily lives more normally and reduce incidence of the common urinary tract infections. The invention provides a flexible urethral drain according to claim 1. One embodiment of the invention comprises a bladder drainage device having at least one deep, open fluid-drainage channel and a low profiled bladder retention means at its distal end. In addition, it can contain an essentially smooth segment, preferably narrowed, in the area of the external urethral sphincter. Urine drains from the bladder, via the open surface channels. The narrowed smooth segment permits the external urethral sphincter to function normally to shut off the leakage of urine from the bladder to the lower portion of the urethra. The drainage channels reappear below the external sphincter. When the sphincter opens, urine and fluid will flow past the relaxed sphincter area at the smooth, narrowed drain region, and down to the deep surface drainage channels below. Unlike the situation with the Foley type catheter and the catheter of Figures 6 and 7 of the Spinosa et al. '608 patent, where urine is continuously drained in a leaking fashion from the bladder through an internal lumen of the drainage catheter, the present configuration of the invention allows urine to be stored in the bladder until voided in mass, much as in a normal manner, when the patient is ready to do so. Due to this natural and daily multiple automatic flushing action in the urethra and channel walls by a rushing of the bolus of urine, the bladder drain of the present invention is self-cleansing without any added external pressurized flushing equipment means, such as that described in U.S. Patent No. 4,723,946, or any added steps for the patient. The device of the present invention, without the smooth segment, can be worn by patients in cases where constant urine drainage is required or unavoidable. Thus, the drain will have the benefits of the lower profile retention means for reduced bladder irritability, and the deep external drainage channel(s) causing urine flow to be in contact with the urethral wall to minimize colonization of bacteria and other contaminants within a lumen, thus lower possibility of infections. The presence of the narrow, smooth segment at the site of the external urethral sphincter region allows the natural constriction of the external urethral sphincter to terminate the flow of fluid to the distal bulbous and penile urethra as the sphincter normally functions. The patient is, therefore, able to control his own voiding frequency. This permits the drain device to be worn by ambulatory patients without the necessity of an external urine drainage collection leg bag. Patients suffering from urinary incontinence have differing degrees of contractibility of the external urinary sphincter, depending upon age and other factors. By providing a smooth surface section that can be repositioned along the length of the externally grooved drain member and which can be selected for its outer diameter, a variety of patients can be accommodated. The distal end of the drain device located within the bladder contains a retention means for retaining it at the bladder neck. This preferably a coiled section of the flexible, deep open channeled drainage device, which is initially straightened for insertion in the urethra by a straightening stylet placed in a central lumen of the drain device. Removing the wire after drain placement restores the curl. Due to the fact that the low profile retention means is an extension of the drainage segment, no balloon is needed, nor is there a necessity for a perpendicular, upward-protruding tubing with lateral openings for the passage of urine. The retention means is spaced apart from the smooth narrowed section a distance to assure drainage within the prostatic urethra. Before exiting the urethra, the deep channels are replaced by a traditional tubular structure, the collection segment, which proceeds to exit the urethra. This collection segment collects fluid from the deep external channel(s) above, transports it beyond the meatus of the penis, and permits the attachment of a urine drainage collection bag or a plug at the proximal end. The tubular collection segment can be detached from the channeled main drain body, thus leaving the entire drain device concealed inside the urethra. This further insures minimal infection from outside contamination, and avoids the aesthetically displeasing and uncomfortable presence of an external device. US-A-4 307 723 discloses an ureteral stent comprising a solid core with external channels, which are cleaned by peristaltic action of the ureteral walls during continuous conveyance of urine from the kidneys to the bladder. Thus, the object of this invention is to greatly increase the quality of life for patients who require bladder drainage catheters. BRIEF DESCRIPTION OF THE DRAWINGS The foregoing features and advantages of the invention will become apparent to those skilled in the art from the following detailed description of the present invention, in which numerals in the several view refer to corresponding parts. Figure 1 is an elevational view of a bladder drain in accordance with a first embodiment of the invention; Figure 1(a) is a partial view of the bladder drain of Figure 1, but with an alternative anchoring structure; Figure 2 is an elevational view of an alternative embodiment of the bladder drain in accordance with the invention; Figure 3 is a view illustrating the embodiment of Figure 2 inserted in the male urethra; Figure 4 is a fragmentary, enlarged perspective view of the portion of a bladder drain, illustrating two straight surface grooves; Figure 5 is a fragmentary, enlarged perspective view of a portion of a bladder drain illustrating spiral surface grooves; Figure 6 is an enlarged cross-sectional view of a portion of the body of a bladder drain having four surface grooves extending the length thereof; Figure 7 is an enlarged cross-sectional view through a portion of the body of a bladder drain having three surface grooves extending along the length dimension thereof; Figure 8 is an enlarged cross-sectional view through a portion of the body of a bladder drain having a positionable smooth sleeve segment affixed thereto; Figure 9 is a partially sectional, fragmentary view of the embodiment of Figures 1 or 2 proximate the junction between the grooved bladder drain element and its associated collection segment; Figure 9(a) is an exploded, partial, sectional view of a drain member having straight (non-spiral) surface grooves and a collection tube used therewith; Figure 10 is an enlarged, partial, perspective view of a segment of the drain of Figure 7 and incorporating retention rings thereon; Figure 11 is a partial side elevation of a drain device having the configuration of Figure 7 and illustrating an alternative drain retention feature. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring first to Figure 1, there is shown a perspective view of a bladder drainage device in accordance with a first embodiment of the invention. It is indicated generally by numeral 10 and is seen to comprise an elongated, flexible tubular member 12 having a proximal end 14 and a distal end 16 and with a stylet receiving lumen 18 extending longitudinally toward but just short of the distal end 16. Thus, the distal end 16 covers the stylet lumen precluding the flow of body fluids therethrough when the drainage device 10 of the present invention is in place within the urethra of a patient. With continued reference to Figure 1, the body member 12 of the drainage device 10 is shown as including at least one channel 20 formed in the surface thereof and it extends substantially the entire distance from the proximal end 14 to the distal end 16. In Figure 1, the channel 20 is shown as spirally traversing the drain body 12, but it is to be understood that the channel or channels may be straight, as well. With no limitation intended, for a drain device having an outside dimension of 5.33 mm (0.21 inches), the helical channel 20 may have a depth of approximately 1.52 mm (0.06 inches). The body member is preferably fabricated from a flexible polymer material, such as silicone, silastic, polyurethane or another thermoplastic elastomer having a durometer shore hardness between about 30 and 95 shore A. Disposed proximate the distal end of the bladder drain device is a bladder retention segment 22 which comprises a curled end portion which can be straightened by the full insertion of a wire stylet (not shown) through the lumen 18. However, when the stylet is fully withdrawn following insertion of the drain assembly as shown in Figure 1 into the urethra with the distal portion within the bladder, the memory property of the plastic comprising the distal end portion of the drainage device 10 allows the preformed distal end, bladder-retaining portion 22, to form a loop or curl as illustrated. Those skilled in the art can appreciate that means other than a controlled memory property are available for creating the curl on the distal end of the drainage device. For example, a short wire segment having a preformed shaped can be embedded into the body of the drain to enhance the formation of the curl upon extraction of the stylet. Attached to the proximal end of the bladder drain 10 is a fluid collection segment, indicated generally by numeral 24. The fluid collection segment 24 may be attached and detached from the drainage segment 12 in a manner that will be described later herein. In its simplest form, the collection segment 24 comprises an elongated plastic tube 26 having an internal lumen extending from the proximal end 14 of the drain segment 10 to an open distal end 28 which forms the drain outlet. The collection segment 24 can accept a drainage bag or a plug not shown. To facilitate removal of the drain, a strand such as a monofilament nylon line 25, is fixedly secured to the proximal end 14 of the drain 12 and extends beyond the proximal end 28 of the collection segment 24 and out the urethral opening in the penis. By grasping the monofilament line 25 by the loop 27 and pulling on the line, the memory property of the fixation member 22 is overcome and the drain can be readily pulled through the urethra and out the end of the penis. If desired, the line 25 may terminate short of the proximal end 28 of the collection segment 24 and in that event, an instrument having a hook on it may be passed up the lumen of the collection segment 24 to grasp a loop 29 tied in the line. By now pulling on the instrument, the drain member 12 can again be removed. An alternative embodiment of the invention is depicted in Figure 2. The assembly of Figure 2 is similar in most respects to the embodiment of Figure 1 except that in the drain device 30 of Figure 2, the tubular member 12 includes a narrowed and smooth (non-channeled) segment 32 for cooperating with the external sphincter of the urethra. At the distal end of the segment 32 is a tapered shoulder 34 and at the proximal end is a more squared shoulder 37. The length of segment 32 is preferably in the range of from 0.5 cm to 5.0 cm and its outer diameter may be from 0.1 to 2.0 cm. Referring next to Figure 3, it shows the bladder drain device 30 of the embodiment of Figure 2 disposed in the male urethra. The bladder retention portion 22 is located proximate the neck of the bladder 35 and with the installation stylet (not shown) fully removed, the bladder retention portion assumes its flat spiral configuration, thereby holding the drainage device in place. The portion of the drainage device 30 located above the tapered shoulder 34 is dimensioned to traverse the prostate 36 and with the zone 32 of reduced diameter extending through the external urethral sphincter 38. If desired, a string or monofilament 25 can be co-extruded with the drain device of Figure 2 to inhibit stretching of the device in zone 32 when tensile forces are applied during removal of the drain. The spiral curl 22 comprising the retention element is essentially perpendicular to the axial length of the drain and does not protrude appreciably above the base of the bladder. This low, flat profile distinguishes from the common Foley catheter, which is retained by means of a liquid filled balloon, as well as from the device shown in U.S. Patent No. 4,738,667 to Galloway. The removal of a straightening stylet, as compared to the removal of an outer shield in the Galloway device, serves to minimize any irritation to the urethral wall of the patient. The use an internal straightening wire, as contrasted to a design utilizing an external straightening sleeve, also allows the existence of deeper drainage channels for a given outer diameter of the drain itself. While the bladder retention segment is depicted as a spiral or curl at the distal end of the body member 12 comprising the drain, it can be appreciated that an inflatable balloon adhered to the exterior of the tubular body 12 and communicating through a port bridged by the balloon leading to an inflation lumen may be employed to anchor the drain in a fashion similar to what is conventionally used with a Foley catheter. Such an arrangement is shown in Figure la, with the silastic balloon identified by numeral 39. With the embodiment of Figure 2 in place, as illustrated in Figure 3, there will be a continuous flow of urine from the bladder 35 through the channel 20 formed in the exterior wall of the drain segment 30 with the channel emptying into the lumen of the urine collection tube 24. For patients having a functioning external urethral sphincter 38, the compressional force on the urethra in the zone 32 of the drain will close the urethra against that segment thereby blocking urine flow. When the patient desires to drain his or her bladder, he or she voluntarily relaxes the external urethral sphincter 38, allowing the contents of the bladder 35 to flow through the channel(s) formed in the wall surface of the drainage device 30 to again empty into the urine collection tube 24 leading to a collection bag (not shown). Figures 4 through 7 are included to show alternative ways of configuring the drainage segments 10 and 30 illustrated in Figures 1 and 2, respectively. In Figure 4, the drainage segment 12 includes two straight longitudinal channels 40 and 42, diametrically opposed from one another, that extend substantially the entire length of the drainage segment. Also visible in Figures 4 through 7 is the stylet lumen 18. In the embodiment of Figure 5, the surface grooves, as at 20, form a spiral, as in the embodiments of Figures 1 and 2. This spiral pattern may conveniently be formed during the fabrication process by twisting the segment 12 during the extrusion process prior to cooling. By controlling the amount of twisting, the pitch of the channels can be controlled. While linear channels of the type shown in Figure 4 may be provided in the drainage segment, a spiral channel configuration is preferred in that the lateral projections on the outer surface of the drain will interact with the urethral wall in such a fashion as to retard movement of the drain along the axial length of the urethra, thus minimizing undesired migration thereof. The side walls of the channels are preferably undercut or dished, as at 44 (Figure 6), to thereby prevent irritation of the urethra, and to inhibit invagination of the urethral wall tissue into the channels. Figures 6 and 7, respectively, show cross-sectional views of the drain in which four and three channels, respectively, extend the length thereof. Referring to the cross-sectional view of Figure 8, another way of forming a smooth segment along the length of the drainage member 12 for cooperating with the external urinary sphincter of a given patient is to provide a short length of tubing, as at 45, having an internal lumen whose side walls are complimentary in shape to the exterior surface of the grooved drainage member 12. Thus, the smooth portion of the tube 45 can be longitudinally adjusted to a location along the drain body where the urinary sphincter is located for that patient. Also, the outside diameter of the removable and replaceable smooth tubular segment 45 can be selected to accommodate the particular contractibility of the urinary sphincter of the patient to provide increased continence and will usually be in the range of from 0.3 cm to 1.0 cm. It is further contemplated that the smooth tubular member 45 on the female urethral drain can comprise an inflatable sleeve surrounding the drain member 12 (Fig. 1). This is deemed to be beneficial in cases of female stress incontinence in that the sleeve can be inflated after placement to a degree effective to preclude leakage between the expandable sleeve and the neck of the bladder and to compensate for sphincter deficiency. Referring now to Figure 9, there is shown an enlarged fragmentary, partially sectioned view of the bladder drain 26 showing the manner in which the fluid collection tube 26 is joined to the proximal end of the grooved drainage member 12. The proximal end 14 of the drainage member 12 is provided with a narrowed neck 46 which is followed by an expanded end portion 48. The fluid collection tube 26 has a complimentary profile 50 adapted to snap over the end portion 48 to occupy the narrowed neck 46. Urine passing along the channels 20 between the internal wall of the urethra and the drain is channeled into the lumen of the collection tube 26 to flow out its proximal end 28, either continuously when the embodiment of Figure 1 is employed or in a controlled manner when the embodiment of Figures 2 or 8 is utilized. Detachment of the flexible plastic collection tube 26 may be accomplished by pulling on the tube 26 in the proximal direction while simultaneously employing a stabilizing push rod 52 to hold the drainage segment 12 in place. After detachment of the collection tube 26, the drain device is entirely contained within the urethral tract. Figure 9(a) is an enlarged, exploded, partial sectional view of a drain member 12 having straight (non-spiral) grooves such as is illustrated in Figure 7 of the drawings and illustrating an alternative arrangement for connecting the drain body to an associated collection tube. The drain body 12 is molded or extruded so as to have a plurality of straight parallel grooves as best seen in Figure 7. Surrounding the proximal end portion of the drain 12 is a ring member 53 which is secured to the exterior of the lobes of the drain body separated from one another by adjacent grooves. To better concentrate and direct the urine stream, the central portion of the drain body is cored out, leaving only the lobes depending in a zone of a predetermined length distal of the ring 53. The collection tube 26 includes an internal annular groove 55 into which the ring 53 on the drain body is adapted to be inserted. As such, the portion of the lobes on the drain body that are free from the central or core portion thereof fall within the lumen 57 of the collection tube and thereby directing the urine stream flowing down the longitudinal grooves in the drain body to flow into the lumen 57 of the collection tube. To enhance the ability of the urine to find its way into the central lumen of the collection tube, it may be expedient to include a pattern of holes as at 59 through the wall of the collection tube where the size of the holes 59 are made slightly larger toward the distal end of the collection tube 26 and of a smaller size as at 61 at locations more proximal than the larger holes 51. As those skilled in the art will appreciate from the foregoing description of the embodiment of Figure 9, the same technique for detaching the plastic collection tube 26 from the drainage device 12 can be utilized with the embodiment of Figure 9(a). To assist in preventing migration of the drain devices having linear channels as in Figures 4 through 7, a series of longitudinally spaced rings as at 54 in Figure 10 may be placed about the drain body 12 at predetermined intervals. The rings are preferably relatively flat and are appropriately bonded to the drain body 12. It is found that the tissue of the inner wall of the urethra invaginates the channels 40, 42 on opposite sides of the rings 54, inhibiting longitudinal displacement of the drain assembly. With no limitation intended, the rings 54 may be approximately 2 mm wide and 1 mm thick. Further, they may be placed approximately 1 cm apart from one another along the length of the drain body 12 on one or both sides of any smooth segment of reduced diameter as at 32 in Figure 2 that is intended to cooperate with the urinary sphincter. By providing rings 54 along the length of the drain device, it is no longer necessary to include a central stylet receiving lumen 18. The stylet, instead, can be routed up one of the surface channels 40 and 42 and will be constrained by the rings. Figure 11 shows an alternative anchoring arrangement to that shown in Figure 10. Instead of incorporating spaced-apart rings extending about the drain body, small, laterally projecting tines 56 that are located proximate the junction between the drain body 12 and the collection tube 26'. The tines 56 are intended to engage the interior wall of the urethra to prevent migration of the drain assembly in the distal direction toward the urinary bladder. When it is desired to remove the drain, a force applied to the strand 25 (Figure 1) will cause the tines 56 to deflect or collapse into alignment with the wall of the tubular body 12 and offer practically no drag or resistance against movement in the proximal direction. While the tines 56 are shown as being formed by cutting or slicing into the elastomeric material comprising the drain body 12, such tines can alternatively be provided on the collection tube 26'. Furthermore, rather than providing tines as at 56 in Figure 11, the retention means can take the form of a bulbous protrusion (not shown) formed on the lobes of the drain body 12.

Claims: A flexible urethral drain (10, 30) for draining of urine and fluid from the bladder through the urethra of a patient comprising: a flexible, elongated drain body (12) having a distal end (16), a proximal end (14) and a generally solid core, the drain body having an outer diameter allowing passage through the urethra; bladder retention means (22, 39) located adjacent to the distal end (16) of the drain body for retaining the drain body in place in the urethra; the drain body (12) having at least one open fluid drainage channel (20, 40, 42) on an exterior surface thereof of a depth sufficient for draining urine between the exterior surface of the drain body and the urethral wall the at least one open fluid drainage channel extending at least from the bladder retention means (22, 39) toward the proximal end (14) so as to effect drainage of urine from the bladder; and a tubular collection segment (24) affixed to the proximal end (14) of the drain body (12), the tubular collection segment terminating at a proximal end external to the urethra and having an internal lumen, a distal end of which is coupled to the proximal end of the at least one channel (20, 40, 42) for receiving urine from the proximal end of the channel into the internal lumen. The flexible urethral drain of claim 1 wherein the drain body includes an integrally formed longitudinal segment (32) of a uniform diameter which is less than the outer diameter of the drain body (12) and located along the drain body to cooperate with the external urethral sphincter in the patient for providing continence when the sphincter is normally contracted, and allowing passage of urine along the at least one channel (20, 40, 42) when the sphincter is relaxed. The flexible urethral drain of claim 1 further including a positionable sleeve member (45) having a smooth exterior surface void of grooves and an interior surface conforming to the exterior surface of the drain body (12), including the at least one open fluid drainage channel (20, 40, 42). The flexible urethral drain of claim 3 wherein the sleeve member (45) is generally cylindrical in shape. The flexible urethral drain of claim 2, claim 3 or claim 4 wherein the length of the longitudinal segment (32) or of the sleeve member (45) is between 0.5 cm and 5 cm. The flexible urethral drain of claim 5 wherein the length is between 0.5 cm and 3.5 cm. The flexible urethral drain of claim 2, claim 5 or claim 6 as dependent from claim 2 wherein the outer diameter of the longitudinal segment (32) is between 0.1 and 2 cm. The flexible urethral drain of claim 7 wherein the outer diameter is between 0.1 cm and 1 cm. The flexible urethral drain of claim 3, claim 5 or claim 6 as dependent from claim 3 wherein the outer diameter of the positionable sleeve member (45) is between 0.3 cm and 2 cm. The flexible urethral drain of claim 9 wherein the outer diameter is between 0.3 cm and 1 cm. The flexible urethral drain of any one of claims 2 and 5 to 8 as dependent from claim 2 wherein the drain body (12) tapers to the diameter of the longitudina segment (32) at a distal end (34) of the longitudinal segment. The flexible urethral drain of any one of claims 2 and 5 to 8 or 11 as dependent from claim 2 wherein a segment of the drain body (12) proximal to the longitudinal segment (32) joins to the longitudinal segment to form a squared shoulder (37). The flexible urethral drain of claim 1 wherein the bladder retention means comprises a curl (22) at the distal end (16) of the flexible drain body. The flexible urethral drain of claim 13 wherein the at least one channel (20, 40, 42) extends along at least a portion of said curl (22). The flexible urethral drain of claim 13 or claim 14 wherein the curl (22) has a flat profile and extends perpendicular to a longitudinal axis of the remainder of the drain body (12). The flexible urethral drain of claim 13, claim 14 or claim 15 wherein the tubular body includes a stylet receiving lumen (18) and the curl (22) is preformed and can be reversibly straightened by inserting a stiffening stylet in the stylet-receiving lumen. The flexible urethral drain of claim 1 wherein the bladder retention means comprises an inflatable member (39). The flexible urethral drain of any preceding claim wherein the drain body (12) comprises a flexible polymer material selected from silicone, silastic, polyurethane and polyethylene. The flexible urethral drain of claim 18 wherein the polymer material has a durometer in the range of from 30 to 95 shore A. The flexible urethral drain of claim 1 further including means (54, 56) on the drain body for inhibiting longitudinal migration of the drain body relative to the urethral wall. The flexible urethral drain of claim 20 in which the migration inhibiting means comprises a plurality of longitudinally spaced ring members (54) disposed on the drain body (12) and overlaying the open fluid drainage channel (20, 40, 42). The flexible urethral drain of claim 21 wherein the migration inhibiting means comprises a plurality of integrally formed tines (56) extending laterally of the exterior surface.

Inventors: TIHON CLAUDE, TIHON, CLAUDE
Applicants: CONTICARE MEDICAL INC, CONTICARE MEDICAL, INC.
Application year: 1996
Main classification: A61M25
IPC codes: A61F2, A61M25, A61M1