STENT HAVING REDUCED PASSAGE OF EMBOLI AND STENT DELIVERY SYSTEM

• US 20080167708A1
• Filed: 11/14/2007
• Published: 07/10/2008
• Est. Priority Date: 11/17/2006
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Dudney, Josh, Vandlik, Mark, Vogel, Jeff, Molland, Doug, Tatalovich, Joe, Kusleika, Richard, Ma, Jianlu
• Granted Patent: US 10,188,534 B2
• Time in Patent Office: Days
• US Class Current: 623/1.17
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2210/0057 stretchable
• CPC Class Codes: A61F 2210/0076 multilayered, e.g. laminated structures
• CPC Class Codes: A61F 2220/0041 using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2250/0023 differing in porosity
• CPC Class Codes: A61F 2250/0048 differing in mechanical expandability, e.g. in mechanical, self- or balloon expandability

Abstract

A stent for reducing the passage of emboli into body lumen once deployed includes a structural portion and a barrier portion. The structural portion, when expanded in a conduit, provides sufficient strength to maintain an open lumen in the conduit. The barrier portion reduces migration of emboli from the wall of the conduit through the structural portion and into the lumen. Stent delivery systems capable of delivering and deploying the stent are disclosed.

Claims

1. An expandable tubular stent for implantation in a body lumen comprising:

a structural layer extending along an axis and having a delivery diameter length and an expanded diameter length along the axis; and

a barrier layer affixed to the structural layer and having a delivery diameter length and an expanded diameter length along the axis;

the structural layer expanded diameter length being within the range of 1% to 25% of the barrier layer expanded diameter length.

2. The stent of claim 1 wherein the structural layer expanded diameter length is within 15% of barrier layer expanded diameter length.

3. The stent of claim 1 wherein the structural layer expanded diameter length is within 10% of barrier layer expanded diameter length.

4. The stent of claim 1 wherein the structural layer expanded diameter length is within 5% of barrier layer expanded diameter length.

5. The stent of claim 1 wherein the structural layer expanded diameter length is within 2.5% of barrier layer expanded diameter length.

6. An expandable tubular stent for implantation in a body lumen comprising:

a structural layer extending along an axis and having a delivery diameter length and an expanded diameter length along the axis; and

a barrier layer affixed to the structural layer and having a delivery diameter length and an expanded diameter length along the axis;

the structural layer delivery diameter length being within the range of 1% to 25% of barrier layer delivery diameter length; and

the structural layer expanded diameter length being within the range of 1% to 25% of barrier layer expanded diameter length.

7. The stent of claim 6 wherein the structural layer delivery diameter length is within 15% of barrier layer delivery diameter length.

8. The stent of claim 6 wherein the structural layer delivery diameter length is within 10% of barrier layer delivery diameter length.

9. The stent of claim 6 wherein the structural layer delivery diameter length is within 5% of barrier layer delivery diameter length.

10. The stent of claim 6 wherein the structural layer delivery diameter length is within 2.5% of barrier layer delivery diameter length.

11. An expandable tubular stent for implantation in a body lumen comprising:

a structural layer extending along an axis and being radially expandable from a delivery diameter to an expanded diameter about the axis; and

a barrier layer affixed to the structural layer and being elastically and radially expandable from a delivery diameter to an expanded diameter about the axis;

the delivery diameter of the barrier layer elastically expanding in the range of 100% to 1,500% to the barrier layer expanded diameter.

(additional claims analogous to 11-15, except plasticly expanding rather than elasticly expanding, might be good.)

12. The stent of claim 11 wherein the barrier portion elastic expansion from the delivery diameter to the expanded diameter is greater than 250%.

13. The stent of claim 11 wherein the barrier portion elastic expansion from the delivery diameter to the expanded diameter is greater than 500%.

14. The stent of claim 11 wherein the barrier portion elastic expansion from the delivery diameter to the expanded diameter is greater than 750%.

15. The stent of claim 11 wherein the barrier portion elastic expansion from the delivery diameter to the expanded diameter is greater than 1000%.

16. An expandable tubular stent for implantation in a body lumen comprising:

a structural layer extending along an axis; and

a barrier layer affixed to the structural layer and having a plurality of pores extending therethrough, the plurality of pores having an average pore size;

the barrier layer having a range of pore sizes within ±

1% to ±

25% of the average pore size.

17. The stent of claim 16 wherein the barrier layer has a range of pore sizes within ±

15% of the average pore size.

18. The stent of claim 16 wherein the barrier layer has a range of pore sizes within ±

10% of the average pore size.

19. The stent of claim 16 wherein the barrier layer has a range of pore sizes within ±

5% of the average pore size.

20. An expandable tubular stent for implantation in a body lumen comprising:

a structural layer extending along an axis; and

a barrier layer affixed to the structural layer and having a plurality of pores extending therethrough,

the plurality of pores having pore sizes within a range of 40 microns to 3,000 microns.

21. The stent of claim 20 wherein the plurality of pores have pore sizes of 1,500 microns.

22. The stent of claim 20 wherein the plurality of pores have pore sizes of 1,000 microns.

23. The stent of claim 20 wherein the plurality of pores have pore sizes of 750 microns.

24. The stent of claim 20 wherein the plurality of pores have pore sizes of 500 microns.

25. The stent of claim 20 wherein the plurality of pores have pore sizes of 250 microns.

26. The stent of claim 20 wherein the plurality of pores have pore sizes of 125 microns.

27. The stent of claim 20 wherein the plurality of pores have pore sizes of 80 microns.

28. An expandable tubular stent for implantation in a body lumen comprising:

a structural layer extending along an axis being radially expandable thereabout and having a first expanded percentage open area; and

a barrier layer affixed to the structural layer and having a second expanded percentage open area;

the stent having an composite expanded percentage open area within a range of 65% to 95%.

29. The stent of claim 28 wherein the stent has a composite expanded percentage open area of approximately 70%.

30. The stent of claim 28 wherein the stent has a composite expanded percentage open area of approximately 75%.

31. The stent of claim 28 wherein the stent has a composite expanded percentage open area of approximately 80%.

33. The stent of claim 28 wherein the stent has a composite expanded percentage open area of approximately 85%.

34. The stent of claim 28 wherein the stent has a composite expanded percentage open area of approximately 90%.

35. An expandable tubular stent for implantation in a body lumen comprising:

a structural layer extending along an axis and being radially expandable from a delivery diameter to an expanded diameter about the axis; and

a barrier layer affixed to the structural layer and being plastically and radially expandable from a delivery diameter to an expanded diameter about the axis;

the delivery diameter of the barrier layer plastically expanding in the range of 100% to 1,500% to the barrier layer expanded diameter.

36. The stent of claim 35 wherein the barrier portion plastic expansion from the delivery diameter to the expanded diameter is greater than 250%.

37. The stent of claim 35 wherein the barrier portion plastic expansion from the delivery diameter to the expanded diameter is greater than 500%.

38. The stent of claim 35 wherein the barrier portion plastic expansion from the delivery diameter to the expanded diameter is greater than 750%.

39. The stent of claim 35 wherein the barrier portion plastic expansion from the delivery diameter to the expanded diameter is greater than 1000%.