Continent urethral stent for treating and preventing urethral stricture after surgery

• US 5,322,501 A
• Filed: 10/02/1992
• Issued: 06/21/1994
• Est. Priority Date: 10/02/1992
• Status: Expired due to Fees

• Current Assignee: Ayaz Mahmud-Durrani
• Original Assignee: Ayaz Mahmud-Durrani
• Inventors: Mahmud-Durrani, Ayaz
• Primary Examiner(s): Yasko, John D.
• Assistant Examiner(s): Wilkens, Frank
• Application Number:
  US07/955,450
• Time in Patent Office: 627 Days
• Field of Search: 604/8, 604/49, 604/54, 604/93, 604/104, 604/105, 604/280, 604/281, 606/108, 606/198
• US Class Current: 604/8
• CPC Class Codes: A61M 2210/1078 Urinary tract
• CPC Class Codes: A61M 25/04 in the body, e.g. expansible A61M25/10, A61M16/0488 take precedence
• CPC Class Codes: A61M 27/008 pre-shaped, for use in the urethral or ureteral tract

Abstract

Disclosed is an apparatus and method for treating and preventing urethral stricture following surgery. The apparatus comprises a hollow cylindrical stent having a normally-expanded, contractible locating member attached at one end and a retrieving string attached at the other end. The contractible locating member is attached to the tube by two flexible strings. The contractible locating member is adjusted to its contracted condition by a cylindrical pusher prior to insertion into the bladder through the urethra. Once the contractible locating member is located in the bladder, the pusher is removed to permit the contractible locating member to return to its normally-expanded condition to provide an anchor in the bladder neck. The two strings connecting the stent and the contractible locating member are placed in the prostate and external sphincter, allowing the patient to remain continent. After healing is completed, the assembly can be retrieved by pulling the retrieving string.

Claims

1. A urethral stent assembly for insertion in a male urethra and bladder, comprising:

a stent comprising a hollow cylindrical tube having an inner end and an outer end;

locating means for placement in the bladder for fixing the position of said tube in the urethra, said locating means having a normally expanded condition and being selectively adjustable to a contracted condition; and

flexible connecting means for placement in the prostatic urethra and connecting said inner end of said tube to said locating means, said flexible connecting means being separate from said hollow cylindrical tube.

2. The urethral stent assembly of claim 1, further comprising adjustment means for adjusting said locating means to said contracted condition.

3. The urethral stent assembly of claim 1, wherein said locating means comprises a leading tip, a trailing tip, and a normally-expanded, contractible connecting portion connecting said leading tip and said trailing tip, said connecting portion having a fluid flow path therethrough.

4. The urethral stent assembly of claim 3, wherein said connecting portion comprises multiple ribbons separated from each other along at least a portion of their length, said ribbons being formed of a flexible and resilient material.

5. The urethral stent assembly of claim 3, further comprising adjustment means for contracting said contractible connecting portion.

6. The urethral stent assembly of claim 5, wherein said adjustment means comprises a cylindrical body axially slidable within said cylindrical tube and engageable with said leading tip of said locating means.

7. The urethral stent assembly of claim 1, wherein said assembly further comprises guiding means for guiding said tube into the urethra and said locating means into the bladder.

8. The urethral stent assembly of claim 7, wherein said guiding means comprises an axially elongated guide wire.

9. The urethral stent assembly of claim 1, wherein said assembly further comprises retrieving means for retrieving said tube, said locating means, and said connecting means from the bladder and urethra.

10. The urethral stent assembly of claim 9, wherein said retrieving means comprises a flexible string attached to said tube.

11. The urethral stent assembly for insertion in a male urethra and bladder, comprising:

a stent comprising a hollow cylindrical tube having an inner end and an outer end;

locating means for placement in the bladder for fixing the position of said tube in the urethra, said locating means having a normally expanded condition and being selectively adjustable to a contracted condition; and

flexible connecting means for placement in the prostatic urethra and connecting said inner end of said tube to said locating means, said flexible connecting means being separate from said hollow cylindrical tube;

wherein said flexible connecting means comprises string means of sufficient length for permitting the inner end of said hollow cylindrical tube to be positioned in the urethra outwardly of the external sphincter while said locating means remains in its expanded condition inside the bladder.

12. The urethral stent assembly of claim 11, further comprising adjustment means for adjusting said locating means to said contracted condition.

13. The urethral stent assembly of claim 11, wherein said locating means comprises a leading tip, a trailing tip, and a normally-expanded, contractible connecting portion connecting said leading tip and said trailing tip, said connecting portion having a fluid flow path therethrough.

14. The urethral stent assembly of claim 13, wherein said connecting portion comprises multiple ribbons separated from each other along at least a portion of their length, said ribbons being formed of a flexible and resilient material.

15. The urethral stent assembly of claim 13, further comprising adjustment means for contracting said contractible connecting portion.

16. The urethral stent assembly of claim 15, wherein said adjustment means comprises a cylindrical body axially slidable within said cylindrical tube and engageable with said leading tip of said locating means.

17. The urethral stent assembly of claim 11, wherein said assembly further comprises guiding means for guiding said tube into the urethra and said locating means into the bladder.

18. The urethral stent assembly of claim 17, wherein said guiding means comprises an axially elongated guide wire.

19. A method for treating conditions of the male urethra, comprising the steps of:

a) providing a stent comprising a hollow cylindrical tube having an inner end and an outer end;

b) providing normally-expanded, but contractible locating means for fixing the position of said tube in the urethra;

c) providing flexible connecting means for connecting said inner end of said tube to said locating means;

d) providing a guide wire means for insertion into the urethra and for use in inserting said tube and said locating means into the urethra;

e) adjusting the locating means to its contracted condition;

f) inserting the locating means in the bladder and the stent into the urethra while the locating means is in its contracted condition, with the connecting means being positioned in the prostatic urethra; and

g) allowing the locating means to resume its normally expanded condition after it has been located in the bladder.

20. The method of claim 19, including the additional step of:

(h) extracting the stent to cause the locating means to assume its contracted position and then move outwardly along the urethra until it clears the outer end of the urethra.