Prostatic stent

• US 5,667,486 A
• Filed: 04/26/1994
• Issued: 09/16/1997
• Est. Priority Date: 04/27/1993
• Status: Expired due to Term

• Current Assignee: AMS Medinvent SA
• Original Assignee: AMS Medinvent SA
• Inventors: Mariller, Alain, Burton, John H., Clerc, Claude O., Jedwab, Michael R., Furrer, Adrian, Mikulich, Michael A., Tihon, Claude
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): RUHL, DENNIS WILLIAM
• Application Number:
  US08/233,660
• Time in Patent Office: 1,239 Days
• Field of Search: 604/8, 623/1, 623/12, 606/191, 606/195
• US Class Current: 604/8
• CPC Class Codes: A61F 2/04 Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts A61F2/18, A61F2/20 take precedence; devices, other than stent-grafts, providing patency to, or preventing collapsing of, tubular structures of the body other than stent-grafts, e.g. stents A61F2/82; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2230/0008 elliptical or oval

Abstract

A prostatic stent and method of manufacture. The stent has an elongate body defining a passage therethrough and includes a distal section, a mid-section and a proximal section. The elongate body has a length sufficient to extend distally from a bladder neck to a position somewhat short of the external sphincter. The proximal section has a shape conforming to the neck of the urinary bladder.

Claims

1. A prostatic stent comprising an elongate body having a proximal end, a distal end and a passageway extending therebetween and including a distal section, a mid-section and a proximal section, with said elongate body being of a length sufficient to extend from a urinary bladder neck defining a shape to a position proximally of an external sphincter, said distal section having a distally directed flare adapted to conform to a surrounding urethral wall and to prevent proximal migration of the stent, said proximal section having a first terminus with said proximal end being the first terminus of said proximal section and extending in a plane sloping at an angle α

of not more than about 50°

to a normal to a central axis of said body, with the slope of said proximal end being such that the proximal end is configured to conform to said neck and adapted to be closely received within the entrance to the bladder and with said proximal section being elastic and being sized and configured and adapted to substantially conform to the shape of said neck.

2. The stent according to claim 1 wherein said angle α

lies within a range of from about 5°

to about 40°

.

3. The stent according to claim 2 wherein said angle α

lies within a range of from about 10°

to about 30°

.

4. The sent according to claim 1 wherein said mid-section has a substantially constant cross-section along the mid-section, the cross-section having a cross sectional area and shape substantially constant along the mid-section.

5. The stent according to claim 1 wherein said elongate body is substantially circular in cross section.

6. The stent according to claim 5 wherein said elongate body is non-circular in cross section.

7. The stent according to claim 6 wherein said non-circular cross section is an oval configuration.

8. The stent according to claim 1 wherein said body is self-expandable.

9. The stent according to claim 8 wherein said body comprises braided filaments.

10. A prostatic stent comprising an elongate body having a wall structure defining a passage therethrough, said body being formed of braided filaments and with said wall having openings between said braided filaments, said body further comprising a proximal section including a flared and oblique proximal end adapted to conform both radially and axially to an inner surface of a surrounding bladder neck, a mid-section having a substantially constant cross-section with a cross sectional area and shape being substantially constant along the mid-section, and a distal section having a distally directed flare adapted to conform to a surrounding urethral wall and to prevent proximal migration of the stent, said elongate body having a length sufficient to extend distally from said bladder neck to a position proximally of an external sphincter, said wall being adapted to enable growth of natural tissue into said stent.

11. The stent according to claim 10 wherein said body is self-expandable.

12. A prostatic stent comprising an elongate body having a proximal end, a distal end and a passageway extending therebetween and including a distal section, a mid-section and a proximal section, with said elongate body being of a length sufficient to extend from a urinary bladder neck defining a shape to a position proximally of an external sphincter, said distal section having a distally directed taper so that the stent does not interfere with said external sphincter, said proximal section having a first terminus with said proximal end being the first terminus of said proximal section and extending in a plane sloping at an angle α

of not more than about 50°

to a normal to a central axis of said body, with the slope of said proximal end being such that the proximal end is configured to conform to said neck and adapted to be closely received within the entrance to the bladder and with said proximal section being elastic and being sized and configured and adapted to substantially conform to the shape of said neck.

13. A prostatic stent comprising an elongate body defining a passage therethrough, a proximal section including a flared and oblique proximal end, with each said proximal section and said proximal end being configured and adapted to closely conform both radially and axially to fit snugly to an inner surface of a surrounding bladder neck, said proximal end extending in a plane sloping at an angle α

to a normal to a central axis of said body, a not exceeding about 50° and

being such that the proximal end is adapted to be received within the entrance to the bladder, a mid-section having a substantially constant cross section along a length and a distal section having a distally directed flare adapted to conform to a surrounding urethral wall and to prevent proximal migration of the stent, said body comprising braided filaments with said elongate body having a length sufficient to extend distally from said bladder neck to a position proximally of an external sphincter.