Filter with positioning and retrieval devices and methods

• US 20060184193A1
• Filed: 02/16/2005
• Published: 08/17/2006
• Est. Priority Date: 02/16/2005
• Status: Active Grant

• Current Assignee: Lifescreen Sciences LLC (Acacia Research Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Jenson, Mark L., Teague, James A., Lowe, Brian J., Rizq, Raed N., Welch, Eric
• Granted Patent: US 7,993,362 B2
• Time in Patent Office: Days
• US Class Current: 606/200
• CPC Class Codes: A61F 2/0103 With centering means
• CPC Class Codes: A61F 2/0105 Open ended, i.e. legs gathered only at one side
• CPC Class Codes: A61F 2/011 Instruments for their placement or removal
• CPC Class Codes: A61F 2002/016 made from wire-like elements
• CPC Class Codes: A61F 2002/9528 for retrieval of stents
• CPC Class Codes: A61F 2230/005 Rosette-shaped, e.g. star-shaped
• CPC Class Codes: A61F 2230/0058 X-shaped
• CPC Class Codes: A61F 2230/006 Y-shaped
• CPC Class Codes: A61F 2230/0086 Pyramidal, tetrahedral, or wedge-shaped
• CPC Class Codes: A61F 2230/0089 tetrahedral, i.e. having a triangular basis

Abstract

An intravascular filter having centering capabilities and a device for manipulation of the filter within a vessel. The manipulation device includes a grasping member disposed at the distal end of an elongate shaft, wherein the grasping member may be used to engage a portion of the filter.

Claims

1. An intravascular filter placement system comprising:

a filter having a tip and a plurality of legs extending radially outward from the tip, and

a filter manipulation device including an outer elongate member having a proximal end, a distal end and a lumen extending therethrough and an inner elongate member disposed in at least a portion of the lumen having a proximal end and a distal end, wherein the inner elongate member includes an expandable generally tubular grasping portion for grasping the filter during a filter manipulation process.

2. The intravascular filter placement system of claim 1, wherein the expandable member is biased in an expanded position.

3. The intravascular filter placement system of claim 2, wherein the expandable member is a braided member.

4. The intravascular filter placement system of claim 3, wherein the braided member is conical shaped.

5. The intravascular filter placement system of claim 2, wherein the expandable member is a plurality of gripping members integrally formed in the distal end of the inner elongate member.

6. The intravascular filter placement system of claim 5, wherein the inner elongate member is a polymer, wherein the plurality of gripping members are heat set in the expanded position.

7. The intravascular filter placement system of claim 1, wherein the expandable member is an enlarged diameter portion of the inner elongate member.

8. The intravascular filter placement system of claim 1, wherein the outer elongate member includes a means for centering the outer elongate member in a vessel.

9. The intravascular filter placement system of claim 8 wherein the means for centering the outer elongate member is an inflatable balloon.

10. The intravascular filter placement system of claim 9, wherein the inflatable balloon includes a plurality of lobes.

11. The intravascular filter placement system of claim 8, wherein the means for centering the outer elongate member includes a plurality of wires including a shape memory alloy.

12. A filter manipulation device comprising:

an elongate shaft having a proximal end, a distal end and a lumen extending therethrough,

a core wire having a proximal end and a distal end disposed within at least a portion of the lumen of the elongate shaft, and

a braided member disposed about the distal end of the core wire and extending distally therefrom.

13. The filter manipulation device of claim 12, wherein the braided member has a conical shape.

14. The filter manipulation device of claim 13, wherein the braided member is biased in an expanded position.

15. The filter manipulation device of claim 12, further comprising a sleeve disposed at the distal end of the core wire, the sleeve securing the braided member to the core wire.

16. The filter manipulation device of claim 15, wherein the sleeve is a hypotube.

17. The filter manipulation device of claim 12, further comprising a clip disposed within a portion of the braided member and secured to the core wire.

18. The filter manipulation device of claim 12, further comprising a means for centering the elongate shaft within a vessel.

19. The filter manipulation device of claim 18, wherein the means for centering the elongate shaft is an inflatable member.

20. The filter manipulation device of claim 19, wherein the inflatable member has a plurality of lobes.

21. The filter manipulation device of claim 18, wherein the means for centering the elongate shaft is a plurality of wires.

22. The filter manipulation device of claim 21, wherein the plurality of wires include a shape memory alloy.

23. The filter manipulation device of claim 12, further comprising a second braided member, wherein the second braided member is disposed within a portion of the braided member and secured to the core wire.

24. An intravascular filter having a central longitudinal axis, wherein the filter has an expanded position and a contracted position, the filter comprising:

a plurality of legs having a proximal end and a distal end, the plurality of legs biased in the expanded position wherein the proximal end of the legs has a common apex at the central longitudinal axis and the distal end of the legs extends radially outward from the central longitudinal axis,

a tip disposed at the apex of the plurality of legs, and

a plurality of feet connected to the distal end of the plurality of legs.

25. The intravascular filter of claim 24, wherein the plurality of feet include longitudinal feet for centering the filter.

26. The intravascular filter of claim 25, wherein the longitudinal feet extend from the distal end of the plurality of legs to a point proximal of the distal end of the legs.

27. The intravascular filter of claim 25, wherein the longitudinal feet have a proximal end and a distal end, wherein the longitudinal feet are connected to the distal end of the plurality of legs at a point intermediate the proximal and distal ends of the longitudinal feet.

28. The intravascular filter of claim 25, further comprising a plurality of anchoring hooks disposed on the plurality of longitudinal feet.

29. The intravascular filter of claim 28, wherein the plurality of feet include a wedge to facilitate disengagement from a vessel wall.

30. A method for manipulating an intravascular filter comprising the steps of:

providing a filter having tip and a plurality of radially expanding legs,

providing a filter manipulation device including an outer elongate member having a proximal end, a distal end and a lumen extending therethrough and an inner elongate member having a proximal end and a distal end disposed within at least a portion of the lumen, the inner elongate member having an expandable member disposed at the distal end of the inner elongate member,

advancing the filter manipulation device proximate the filter,

retracting the outer elongate member relative to the inner elongate member, wherein the expandable member is distal of the distal end of the outer elongate member, wherein the expandable member is unrestrained by the outer elongate member,

abutting the expandable member and the filter,

extending the outer elongate member relative to the inner elongate member, wherein the expandable member is at least partially constrained by the outer elongate member, and

maneuvering the filter with the filter manipulation device.

31. The method as claimed in claim 30, further comprising the step of;

expanding a means for centering the outer elongate member within a vessel.

32. The method as claimed in claim 31, wherein the means for centering the outer elongate member includes an inflatable balloon.

33. The method as claimed in claim 31, wherein the means for centering the outer elongate member includes a plurality of wires including a shape memory alloy.

34. The method as claimed in claim 30, wherein the expandable member includes a braided mesh.

35. The method as claimed in claim 34, wherein the braided mesh provides a frictional purchase with the filter.