Percutaneous transluminal angioplasty device with integral embolic filter

• US 20050228438A1
• Filed: 11/24/2004
• Published: 10/13/2005
• Est. Priority Date: 04/08/2004
• Status: Active Grant

• Current Assignee: Contego Medical, Inc.
• Original Assignee: Contego Medical, LLC
• Inventors: Roberts, Larry A., Sutton, Gregg, Sachar, Ravish
• Granted Patent: US 8,403,976 B2
• Time in Patent Office: Days
• US Class Current: 606/200
• CPC Class Codes: A61F 2/013 Distal protection devices, i.e. devices placed distally in combination with another endovascular procedure, e.g. angioplasty or stenting
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/018 made from tubes or sheets of material, e.g. by etching or laser-cutting
• CPC Class Codes: A61F 2230/0006 circular
• CPC Class Codes: A61F 2230/0008 elliptical or oval
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61F 2230/008 paraboloidal
• CPC Class Codes: A61M 25/104 used for angioplasty

Abstract

A percutaneous transluminal angioplasty device includes an embolic filter mounted to the catheter shaft at a location distal to the angioplasty balloon. Thus the filter is downstream from the blockage and is properly positioned to capture embolic particles that may be set loose into the blood stream as the angioplasty procedure is performed. The embolic filter is normally collapsed against the catheter shaft to facilitate introduction and withdrawal of the device to and from the operative site. Once the angioplasty balloon is properly positioned, however, means operatively associated with the embolic filter are actuated to erect the filter to position a filter mesh across the lumen of the vessel.

Claims

1. A percutaneous transluminal angioplasty device, comprising:

an elongated catheter having proximal and distal ends;

means mounted to said catheter adjacent the distal end thereof for treating a stenosis in a vessel;

a filter mounted to said elongated catheter distal said angioplasty balloon, said filter being collapsible for insertion of said distal end of said catheter into a blood vessel, and said filter being expandable to capture emboli released into a bloodstream by inflation of said means for treating a stenosis in a vessel; and

means operable from a location proximate said proximal end of said catheter for expanding said filter.

2. The angioplasty device of claim 1, wherein said means for treating a stenosis in a vessel comprises an angioplasty balloon.

3. The angioplasty device of claim 1, wherein said means for treating a stenosis in a vessel comprises a stent.

4. The angioplasty device of claim 1, wherein said means for treating a stenosis in a vessel comprises a mechanical thrombectomy device.

5. The angioplasty device of claim 1, wherein said means for erecting said filter comprises a balloon.

6. The angioplasty device of claim 1, wherein said means for erecting said filter comprises a bellows.

7. The angioplasty device of claim 1, wherein said means for erecting said filter comprises a wire.

8. The angioplasty device of claim 1, wherein said filter comprises:

a plurality of elongated, longitudinal ribs, each of said ribs having a proximal end and a distal end, said proximal and distal ends of each of said ribs being mounted to said catheter; and

at least one of said proximal and distal ends of said ribs being slidably mounted to said catheter such that said proximal and/or distal ends of said ribs are movable relative to one another; and

a filter mesh overlying a distal portion of said ribs;

whereby when said proximal and/or distal ends of said ribs are displaced closer relative to one another, said ribs bow outward, radially expanding said filter mesh.

9. The angioplasty device of claim 8, wherein at least one of said proximal and distal ends of said ribs being slidably mounted to said catheter comprises:

a distal ring portion mounted to said catheter adjacent said distal end;

a proximal ring portion mounted to said catheter between said distal ring portion and said means for treating a stenosis;

at least one of said distal and proximal ring portions being slidably mounted to said catheter such that said ring portions are movable relative to one another; and

said plurality of elongated ribs extending longitudinally between and mounted to said proximal and distal rings.

10. The angioplasty device of claim 8, wherein said means for erecting said filter comprises a balloon configured to displace said proximal and distal ends of said ribs closer relative to one another when inflated.

11. The angioplasty device of claim 8,

wherein said balloon is located between said distal ends of said ribs and said distal end of said catheter, and

wherein inflating said balloon displaces said distal ends of said ribs in a proximal direction to erect said filter.

12. The angioplasty device of claim 8,

wherein said balloon is located between said proximal ends of said ribs and said means for treating a stenosis, and

wherein inflating said balloon displaces said proximal ends of said ribs in a distal direction to erect said filter.

13. The angioplasty device of claim 8,

wherein said means for erecting said filter comprises a balloon disposed between said catheter and said ribs, and

wherein inflating said balloon displaces said ribs radially outward.

14. The angioplasty device of claim 8, wherein said ribs are resilient and normally return to a position imposed against said catheter.

15. The angioplasty device of claim 8, wherein said ribs are resilient and normally return to an expanded configuration.

16. The angioplasty device of claim 8, wherein said ribs are formed of a shape-memory metal.

17. The angioplasty device of claim 16, wherein said shape-memory metal comprises nitinol.

18. The angioplasty device of claim 8, wherein said filter mesh extends beyond said ribs in a longitudinal direction relative to the longitudinal axis of said catheter, such that a sac is formed to retain embolic particles when said filter is collapsed.

19. A percutaneous transluminal angioplasty device, comprising:

a catheter comprising a lumen having a distal end;

means mounted to said catheter adjacent the distal end thereof for treating a stenosis in a vessel;

an elongated carrier telescopically received within said lumen of said catheter; and

an embolic filter mounted to the forward end of said carrier, said filter comprising a plurality of ribs formed from a shape-memory metal and arranged to normally assume an open configuration, said plurality of ribs being collapsible such that said filter can be received within said distal end of said lumen;

whereby when said carrier is advanced relative to said catheter such that said embolic filter extends from the distal end of said lumen, said embolic filter opens.

20. The angioplasty device of claim 19, wherein said catheter comprises a first catheter, and wherein said carrier comprises a second catheter.

21. The angioplasty device of claim 19, wherein said carrier comprises a wire.

22. A percutaneous transluminal angioplasty device, comprising:

an elongated catheter having proximal and distal ends;

means mounted to said catheter adjacent the distal end thereof for treating a stenosis in a vessel;

a filter mounted to said elongated catheter proximal said angioplasty balloon, said filter being collapsible for insertion of said distal end of said catheter into a blood vessel, and said filter being expandable to capture emboli released into a bloodstream by inflation of said means for treating a stenosis in a vessel; and

means operable from a location proximate said proximal end of said catheter for expanding said filter.

23. The angioplasty device of claim 22, wherein said means for treating a stenosis in a vessel comprises an angioplasty balloon.

24. The angioplasty device of claim 22, wherein said means for treating a stenosis in a vessel comprises a stent.

25. The angioplasty device of claim 22, wherein said means for treating a stenosis in a vessel comprises a mechanical thrombectomy device.

26. The angioplasty device of claim 22, wherein said means for erecting said filter comprises a balloon.

27. The angioplasty device of claim 22, wherein said means for erecting said filter comprises a bellows.

28. The angioplasty device of claim 22, wherein said means for erecting said filter comprises a wire.

29. The angioplasty device of claim 22, wherein said filter comprises:

a plurality of elongated, longitudinal ribs, each of said ribs having a proximal end and a distal end, said proximal and distal ends of each of said ribs being mounted to said catheter; and

at least one of said proximal and distal ends of said ribs being slidably mounted to said catheter such that said proximal and/or distal ends of said ribs are movable relative to one another; and

a filter mesh overlying a distal portion of said ribs;

whereby when said proximal and/or distal ends of said ribs are displaced closer relative to one another, said ribs bow outward, radially expanding said filter mesh.

30. The angioplasty device of claim 29, wherein at least one of said proximal and distal ends of said ribs being slidably mounted to said catheter comprises:

a distal ring portion mounted to said catheter adjacent said distal end;

a proximal ring portion mounted to said catheter between said distal ring portion and said means for treating a stenosis;

at least one of said distal and proximal ring portions being slidably mounted to said catheter such that said ring portions are movable relative to one another; and

said plurality of elongated ribs extending longitudinally between and mounted to said proximal and distal rings.

31. The angioplasty device of claim 29, wherein said means for erecting said filter comprises a balloon configured to displace said proximal and distal ends of said ribs closer relative to one another when inflated.

32. The angioplasty device of claim 29,

wherein said balloon is located between said distal ends of said ribs and said distal end of said catheter, and

wherein inflating said balloon displaces said distal ends of said ribs in a proximal direction to erect said filter.

33. The angioplasty device of claim 29,

wherein said balloon is located between said proximal ends of said ribs and said means for treating a stenosis, and

wherein inflating said balloon displaces said proximal ends of said ribs in a distal direction to erect said filter.

34. The angioplasty device of claim 29,

wherein said means for erecting said filter comprises a balloon disposed between said catheter and said ribs, and

wherein inflating said balloon displaces said ribs radially outward.

35. The angioplasty device of claim 29, wherein said ribs are resilient and normally return to a position imposed against said catheter.

36. The angioplasty device of claim 29, wherein said ribs are resilient and normally return to an expanded configuration.

37. The angioplasty device of claim 29, wherein said ribs are formed of a shape-memory metal.

38. The angioplasty device of claim 37, wherein said shape-memory metal comprises nitinol.

39. The angioplasty device of claim 29, wherein said filter mesh extends beyond said ribs in a longitudinal direction relative to the longitudinal axis of said catheter, such that a sac is formed to retain embolic particles when said filter is collapsed.