STENT-BASED VENOUS VALVES

• US 20020138135A1
• Filed: 03/21/2001
• Published: 09/26/2002
• Est. Priority Date: 03/21/2001
• Status: Active Grant

• Current Assignee: Cardinal Health Switzerland 515 GmbH (Cardinal Health, Inc.)
• Original Assignee: Cordis Corporation (Cardinal Health, Inc.)
• Inventors: Melzer, Andreas, Duerig, Thomas W.
• Granted Patent: US 6,503,272 B2
• Time in Patent Office: Days
• US Class Current: 623/1.24
• CPC Class Codes: A61F 2/2418 Scaffolds therefor, e.g. support stents
• CPC Class Codes: A61F 2/2475 Venous valves
• CPC Class Codes: A61F 2002/8486 provided on at least one of the ends
• CPC Class Codes: A61F 2220/0008 Fixation appliances for connecting prostheses to the body
• CPC Class Codes: A61F 2220/0016 with sharp anchoring protrusions, e.g. barbs, pins, spikes
• CPC Class Codes: A61F 2220/005 using adhesives
• CPC Class Codes: A61F 2220/0066 stapled
• CPC Class Codes: A61F 2230/0054 V-shaped
• CPC Class Codes: A61F 2230/0067 conical
• CPC Class Codes: A61F 2250/0098 radio-opaque, e.g. radio-opaque markers

Abstract

An artificial venous valve which incorporates a stent having one or more of the elements comprising its frame deformed inwardly towards its center and a biocompatible fabric attached to the one or more elements is utilized to replace or supplement incompetent or damaged venous valves. The elements are deformed and the fabric attached in such a way as to form valve flaps, which when there is no pressure differential on opposite sides of the flaps, substantially occludes the lumen of the vessel into which the artificial valve has been deployed. When there is a pressure differential, albeit slight, due to the pumping of the heart, the flaps easily open and allow blood to flow therethrough while substantially preventing backflow.

Claims

1. An artificial venous valve comprising:

a stent formed from a lattice of interconnected elements and having a substantially cylindrical configuration with first and second open ends, wherein one or more of the elements are deformed inwardly out of the circumferential plane; and

a biocompatible material attached to the one or more elements thereby forming one or more valve flaps.

2. The artificial venous valve according to claim 1, wherein the stent comprises:

a plurality of hoops formed from a plurality of struts connected by a plurality of loops; and

a plurality of bridges connecting adjacent hoops.

3. The artificial venous valve according to claim 1, wherein the stent comprises a superelastic alloy.

4. The artificial venous valve according to claim 3, wherein the alloy comprises from about 50.5 percent to about 60 percent nickel and the remainder comprising titanium.

5. The artificial venous valve according to claim 2, wherein the one or more valve flaps each comprise two deformed elements arranged to form a substantially triangularly shaped support frame.

6. The artificial venous valve according to claim 5, wherein the deformed elements are angled towards one of the first and second open ends at an angle in the range from about twenty degrees to about seventy degrees.

7. The artificial venous valve according to claim 6, wherein the deformed elements are thinner where they are deformed out of the circumferential plane.

8. The artificial venous valve according to claim 1, wherein the one or more valve flaps are dimensioned to substantially occlude the stent when there are no differential forces acting on the valve flaps.

9. The artificial venous valve according to claim 8, comprising six valve flaps.

10. The artificial venous valve according to claim 1, wherein the biocompatible material comprises Teflon®

.

11. The artificial venous valve according to claim 1, wherein the biocompatible material comprises Dacron®

.

13. The artificial venous valve according to claim 12, wherein the self-expanding stent comprises:

a plurality of hoops formed from a plurality of struts connected by a plurality of loops; and

a plurality of bridges connecting adjacent hoops.

14. The artificial venous valve according to claim 12, wherein the self-expanding stent comprises a superelastic alloy.

15. The artificial venous valve according to claim 14, wherein the alloy comprises from about 50.5 percent to about 60 percent nickel and the remainder comprising titanium.

16. The artificial venous valve according to claim 14, wherein the one or more valve flaps each comprise two deformed elements arranged to form a substantially triangularly shaped support frame.

17. The artificial venous valve according to claim 14, wherein the second angle is in the range from about twenty degrees to about seventy degrees.

18. The artificial venous valve according to claim 17, wherein the deformed elements are thinner where they are deformed out of the circumferential plane.

19. The artificial venous valve according to claim 12, wherein the one or more valve flaps are dimensioned to substantially occlude the stent when there are no differential forces acting on the valve flaps.

12. An artificial venous valve comprising:

a self-expanding stent formed from a lattice of interconnected elements and having a substantially cylindrical configuration with first and second ends and a compressed diameter for insertion into a vessel and an expanded diameter for deployment into the vessel, wherein the one or more of the elements are deformed out of the circumferential plane at a first angle when the self-expanding stent is at its compressed diameter and at a second angle when the self-expanding stent is at its expanded diameter, the second angle being greater than the first angle; and

a biocompatible fabric attached to the one or more elements thereby forming one or more valve flaps.