Medical device

• US 20040181186A1
• Filed: 03/13/2003
• Published: 09/16/2004
• Est. Priority Date: 03/13/2003
• Status: Abandoned Application

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Gellman, Barry N., Madden, Michael
• Application Number:
  US10/388,284
• Publication Number:
  US 20040181186A1
• Time in Patent Office: Days
• US Class Current: 604/8
• CPC Class Codes: A61M 27/008 pre-shaped, for use in the urethral or ureteral tract

Abstract

A stent with rapid return and strong shape memory prevents migration of the stent out of a desired site within a patient'"'"'s body due to peristaltic actions. One particular stent includes an elongated member which defines an eccentric lumen extending longitudinally therethrough such that a first wall portion of the elongated member is thicker than a second wall portion of the elongated member. The first wall has a stronger shape memory than the second wall, and it recoils faster than the second wall. Another particular stent includes a co-extruded elongated member. The elongated member comprises a first material co-extruded with a second material where the second material forms at least a portion of a wall of the elongated member. The second material can have a higher modulus of elasticity than the first material. Additionally or alternatively, the second material can include a shape memory material.

Claims

1. A medical device, comprising:

an elongated member defining an eccentric lumen extending longitudinally therethrough such that a first wall portion of the elongated member is thicker than a second wall portion of the elongated member, the elongated member comprising;

a substantially straight portion adapted for placement in a duct within a patient'"'"'s body;

a proximal portion extending integrally from a proximal end of the substantially straight portion, the proximal portion forming a first retaining shape when placed within the patient'"'"'s body to retain the substantially straight portion in place in the duct; and

a distal portion extending integrally from a distal end of the substantially straight portion, the distal portion forming a second retaining shape when placed within the patient'"'"'s body to retain the substantially straight portion in place in the duct.

2. The medical device of claim 1 wherein each of the first and second retaining shapes comprise a coil.

3. The medical device of claim 2 wherein the first wall portion is disposed along an inside circumference of each of the coils.

4. The medical device of the claim 2 wherein the first wall portion is disposed along an outside circumference of each of the coils.

5. The medical device of claim 1 wherein the elongated member comprises a radiopaque material.

6. The medical device of claim 2 wherein the first wall portion further comprises a stronger shape memory than the second wall portion.

7. The medical device of claim 2 wherein the first wall portion recoils faster than the second wall portion.

8. A medical device, comprising:

a co-extruded elongated member defining a lumen extending longitudinally therethrough, the elongated member comprising a first material co-extruded with a second material, the second material forming at least a portion of a wall of the elongated member, the elongated member comprising;

a substantially straight portion adapted for placement in a duct within a patient'"'"'s body; and

a proximal portion extending integrally from a proximal end of the substantially straight portion, the proximal portion comprising the first and second materials and adapted to form a retaining shape when placed within the patient'"'"'s body to retain the substantially straight portion in place in the duct.

9. The medical device of claim 8 wherein the elongated member further comprises a distal portion extending integrally from a distal end of the substantially straight portion, the distal portion comprising the first and second materials and adapted to form a second retaining shape when placed within the patient'"'"'s body to retain the substantially straight portion in place in the duct.

10. The medical device of claim 9 wherein the second material extends between an inner surface of the wall and an outer surface of the wall.

11. The medical device of claim 10 wherein the second material also extends longitudinally in at least the proximal and distal portions of the elongated member.

12. The medical device of claim 11 wherein the second material also extends longitudinally in the substantially straight portion of the elongated member.

13. The medical device of claim 12 wherein the second material is more rigid than the first material.

14. The medical device of claim 8 wherein the second material has a higher modulus of elasticity than the first material.

15. The medical device of claim 8 wherein the first and second materials melt at substantially the same temperature.

16. The medical device of claim 9 wherein each of the retaining shapes comprises a coil.

17. The medical device of claim 16 wherein the second material is disposed along an inside circumference of each of the coils.

18. The medical device of claim 16 wherein the second material is disposed along an outside circumference of each of the coils.

19. The medical device of claim 8 wherein the second material comprises a radiopaque material.

20. The medical device of claim 8 wherein the first material includes a first color and the second material includes a second color.

21. The medical device of claim 9 wherein the second material forms at least a portion of an outer surface of the wall.

22. The medical device of claim 21 wherein the second material also extends longitudinally in at least the proximal and distal portions of the elongated member.

23. The medical device of claim 22 wherein the second material also extends longitudinally in the substantially straight portion of the elongated member.

24. The medical device of claim 8 wherein the second material comprises a shape memory material.

25. The medical device of claim 24 wherein the shape memory material comprises a stronger shape memory than the first material.

26. The medical device of claim 24 wherein the shape memory material recoils faster than the first material.