Filtering device and method for a venous furcation

• US 20040199243A1
• Filed: 01/08/2004
• Published: 10/07/2004
• Est. Priority Date: 07/09/2001
• Status: Abandoned Application

• Current Assignee: Surpass Medical Ltd. (Stryker Corporation)
• Original Assignee: Surpass Medical Ltd. (Stryker Corporation)
• Inventors: Yodfat, Ofer
• Application Number:
  US10/482,954
• Publication Number:
  US 20040199243A1
• Time in Patent Office: Days
• US Class Current: 623/1.16
• CPC Class Codes: A61F 2/01 Filters implantable into blood vessels
• CPC Class Codes: A61F 2/856 Single tubular stent with a side portal passage
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2002/018 made from tubes or sheets of material, e.g. by etching or laser-cutting
• CPC Class Codes: A61F 2002/065 Y-shaped blood vessels
• CPC Class Codes: A61F 2002/821 Ostial stents
• CPC Class Codes: A61F 2230/0006 circular
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61F 2230/0078 hyperboloidal
• CPC Class Codes: A61F 2250/0023 differing in porosity

Abstract

Implantable blood filtering device (20) and method for filtering embolic material (circles) from blood flowing from at least one of source veins (62) and (68) into the sink vein (64) of a venous furcation (60). Device (20) is an expansible, tubular shaped porous mesh-like element (22) of filaments (24), having first end region (e1) positional in a first source vein of venous furcation (60), second end region (e2) positional in a second source vein or in sink vein (64) of venous furcation (60), and middle filtering zone (F) circumferentially and longitudinally extending between first (e1) and second (e2) end regions, whereby middle filtering zone (F) of element (22) when so positioned in venous furcation (60), filters embolic material from blood passing through pores (26) of middle filtering zone (F), while substantially not disturbing flow of blood through venous furcation (60), thereby preventing embolic material from entering sink vein (64) of venous furcation (60).

Claims

1. An implantable blood filtering device for implantation in a venous furcation of two source veins into a sink vein to filter embolic material from the blood in one of said source veins before flowing into said sink vein;

said device comprising a tubular-shaped porous structure having a first end region configured and dimensioned for anchoring in one of said veins at said venous furcation;

a second end region configured and dimensioned for anchoring in another of said veins at said venous furcation; and

a middle filtering zone between said first and second end regions;

said middle filtering zone having pores configured and dimensioned so as to be effective, when said first and second end regions of the tubular-shaped porous structure are anchored in their respective veins, to filter the embolic material in the blood flowing in said one source vein before entering said sink vein.

2. The device according to claim 1, wherein said tubular-shaped porous structure is configured and dimensioned for anchoring said first end region in one of said source veins, and said second end region in said sink vein.

3. The device according to claim 1, wherein said tubular-shaped porous structure is configured and dimensioned for anchoring said first and second end regions in said two source veins.

4. The device according to claim 1, wherein the length (W) of each side of a pore in said middle filtering zone, in the implanted condition of the device, is 0.3-7 mm.

5. The device according to claim 1, wherein the length (W) of each side of a pore in said middle filtering zone, in the implanted condition of the device, is 2-3 mm.

6. The device according to claim 1, wherein said middle filtering zone, in the implanted condition of the device, has a porosity index (PI) of 50-95%.

7. The device according to claim 1, wherein said anchoring in one of said veins and said anchoring in said another of said veins is accomplished by radial force.

8. The device according to claim 1, wherein said tubular-shaped porous structure is of a mesh-like construction, having a plurality of openings, said tubular-shaped porous structure being capable of having a small-diameter contracted state to facilitate its delivery to the venous furcation via a catheter, and a large-diameter expanded state for implanting in said venous furcation.

9. The device according to claim 1, wherein said tubular-shaped porous structure is constructed of a plurality of interwoven filaments.

10. The device according to claim 9, wherein the cross-section perimeter (π

) of said filaments in said middle filtering zone is 80-2500 μ

m.

11. The device according to claim 9, wherein the cross-section perimeter (π

) of said filaments in said middle filtering zone is 180-1300 μ

m

12. The device according to claim 9, wherein the number of filaments (n) in said middle filtering zone is 6-92.

13. The device according to claim 9, wherein the filaments in said middle filtering zone, in the implanted condition of the device, form an angle (α

) of 95-140°

with respect to each other.

14. The device according to claim 9, wherein the filaments in said middle filtering zone, in the implanted condition of the device, define a pitch (p) of 0.5-10 mm.

15. The device according to claim 9, wherein the filaments in said first end region define a first pitch;

the filaments in said second end region define a second pitch; and

the filaments in said middle filtering zone define a third pitch, wherein said first pitch and said second pitch are each less than said third pitch.

16. A method of filtering embolic material in a source vein from flowing into a sink vein at a venous furcation of said sink vein with said source vein and at least one other source vein, comprising:

providing an implantable blood filtering device according to claim 1;

and

implanting said filtering device into said venous furcation.

17. The method according to claim 16, wherein said tubular-shaped porous structure is configured and dimensioned for anchoring said first end region in one of said source veins, and said second end region in said sink vein.

18. The method according to claim 16, wherein said tubular-shaped porous structure is configured and dimensioned for anchoring said first and second end regions in said two source veins.

19. The method according to claim 16, wherein the length (W) of each side of a pore in said middle filtering zone, in the implanted condition of the device, is 0.3-7 mm.

20. The method according to claim 16, wherein the length (W) of each side of a pore in said middle filtering zone, in the implanted condition of the device, is 2-3 mm.

21. The method according to claim 16, wherein said middle filtering zone, in the implanted condition of the device, has a porosity index (PI) of 50-95%.

22. The method according to claim 16, wherein said anchoring in one of said veins and said anchoring in said another of said veins is accomplished by radial force.

23. The method according to claim 16, wherein said tubular-shaped porous structure is of a mesh-like construction, having a plurality of openings, said tubular-shaped porous structure being capable of having a small-diameter contracted state to facilitate its delivery to the venous furcation via a catheter, and a large-diameter expanded state for implanting in said venous furcation.

24. The method according to claim 16, wherein said tubular-shaped porous structure is constructed of a plurality of interwoven filaments.

25. The method according to claim 24, wherein the cross-section perimeter (π

) of said filaments in said middle filtering zone is 80-400 μ

m.

26. The method according to claim 24, wherein the cross-section perimeter (π

) of said filaments in said middle filtering zone is 80-2500 μ

m.

27. The method according to claim 24, wherein the number of filaments (n) in said middle filtering zone is 6-92.

28. The method according to claim 24, wherein the filaments in said middle filtering zone, in the implanted condition of the device, form an angle (α

) of 95-140°

with respect to each other.

29. The method according to claim 24, wherein the filaments in said middle filtering zone, in the implanted condition of the device, define a pitch (p) of 0.5-10 mm.

30. The method according to claim 24, wherein the filaments in said first end region define a first pitch;

the filaments in said second end region define a second pitch; and

the filaments in said middle filtering zone define a third pitch, wherein said first pitch and said second pitch are each less than said third pitch.