Medical implant with reinforcement mechanism

• US 20070038297A1
• Filed: 08/11/2006
• Published: 02/15/2007
• Est. Priority Date: 08/12/2005
• Status: Abandoned Application

• Current Assignee: Edwards Lifesciences Corporation
• Original Assignee: Edwards Lifesciences Corporation
• Inventors: Bakis, George, Bobo, Donald, Ma, Minh
• Application Number:
  US11/502,879
• Publication Number:
  US 20070038297A1
• Time in Patent Office: Days
• US Class Current: 623/2.360
• CPC Class Codes: A61F 2/2451 Inserts in the coronary sinus for correcting the valve shape
• CPC Class Codes: A61F 2210/0004 bioabsorbable
• CPC Class Codes: A61F 2210/0014 using shape memory or superelastic materials, e.g. nitinol

Abstract

An improved medical implant for treating mitral regurgitation is provided. The medical implant comprises proximal and distal anchors connected by a bridge. The medical implant is configured to be delivered into a coronary sinus using a minimally invasive procedure. The bridge is preferably made of a shape memory material which is biased to contract after the implant is delivered. The medical implant further comprises a reinforcement mechanism configured to limit stresses and strains along the length of the bridge. In a preferred embodiment, the reinforcement mechanism is fixed to a plurality of attachment points along the bridge, thereby preventing excessive elongation between any two attachment points. A resorbable material is preferably disposed within gaps along the length of the bridge to temporarily maintain the bridge in an elongated condition. After the proximal and distal anchors are secured in the coronary sinus, the resorbable material gradually resorbs, thereby creating tension in the bridge which applies a force along the mitral valve annulus. The reinforcement mechanism ensures that stresses and strains and distributed evenly while the bridge is in tension.

Claims

1. A medical implant for treating heart valve pathologies, comprising:

a proximal anchor;

a distal anchor;

an elongate bridge formed of a shape memory material, the elongate bridge extending between the proximal and distal anchors; and

a reinforcement mechanism attached to the bridge at a plurality of attachment locations for limiting a maximum separation between adjacent attachment locations;

wherein the medical implant is sized for deployment at least partially in a blood vessel and the bridge is configured to apply a force along a portion of a valve annulus.

2. The medical implant of claim 1, further comprising a resorbable material disposed along the elongate bridge for maintaining the bridge in a stretched length.

3. The medical implant of claim 1, wherein the reinforcement mechanism comprises a fiber thread.

4. The medical implant of claim 1, wherein the reinforcement mechanism comprises a tubular member surrounding at least a portion of the bridge.

5. The medical implant of claim 4, wherein the tubular member is made of Dacron®

.

6. The medical implant of claim 1, wherein the reinforcement mechanism is attached to the proximal and distal anchors.

7. The medical implant of claim 1, wherein the proximal and distal anchors are flexibly attached to the bridge.

8. The medical implant of claim 7, wherein the proximal and distal anchors are attached to the bridge only by the reinforcement mechanism.

9. The medical implant of claim 1, wherein the bridge includes a plurality of expandable elements and wherein the reinforcement mechanism comprises a first fiber attached to every other expandable element.

10. The medical implant of claim 9, wherein the reinforcement mechanism further comprises a second fiber attached to every other element and wherein the fibers are attached in a staggered pattern.

11. A medical implant, comprising:

a shape memory material; and

a reinforcement mechanism attached to the shape memory material along a plurality of attachment points for limiting the movement between adjacent attachment points after delivery into a human body.

12. The medical implant of claim 11, further comprising a resorbable material disposed within gaps along the shape memory material.

13. The medical implant of claim 11, wherein the reinforcement mechanism limits the maximum separation between adjacent attachment points.

14. The medical implant of claim 11, wherein the reinforcement mechanism limits the expansion of the shape memory material.

15. The medical implant of claim 14, wherein the reinforcement mechanism comprises an elongate fiber.

16. The medical implant of claim 14, wherein the reinforcement mechanism is tied to the shape memory material at the attachment points.

17. The medical implant of claim 14, wherein the reinforcement mechanism is glued to the shape memory material at the attachment points.

18. A medical implant having a composite structure, comprising:

a shape memory material; and

a limiting member attached to the shape memory material along a plurality of attachment points for limiting the movement between adjacent attachment points.

19. The medical implant of claim 18, wherein the limiting member further provides a redundant connection between adjacent attachment points.

20. The medical implant of claim 19, wherein the limiting member comprises at least one fiber thread.