Mechanical heart valve with compliant sewing ring

• US 5,035,709 A
• Filed: 03/29/1990
• Issued: 07/30/1991
• Est. Priority Date: 03/29/1990
• Status: Expired due to Term

• Current Assignee: Edwards Lifesciences Corporation
• Original Assignee: Baxter International Inc.
• Inventors: Kafesjian, Ralph, Nguyen, Than, Lam, Hung L., Stobie, Robert, Wieting, David W.
• Primary Examiner(s): Frinks, Ronald
• Application Number:
  US07/502,158
• Time in Patent Office: 488 Days
• Field of Search: 623/2
• US Class Current: 623/2.2
• CPC Class Codes: A61F 2/2409 Support rings therefor, e.g. for connecting valves to tissue annuloplasty rings A61F2/2442

Abstract

A mechanical heart valve having one or more leaflets pivotally fitted in a substantially cylindrical shaped valve body formed from a resiliently deformable material. A stiffening member formed from substantially nonresilient material fit about the valve body exterior wall to provide structural integrity to the valve body. Stresses which are normally applied to the heart valve body during the opening and closing of the valve are absorbed or cushioned by the incorporation of a rubber-like body between the stiffening member and the retainer member. Further cushioning is provided by incorporating another rubber-like body in the sewing ring. This second body extends out from the exterior surface of the valve body. Finally, a length of fabric is positioned about the retainer and shock absorbing bodies. This design provides a precisely calibrated rotational torque which allows for optimum orientation of the leaflets by the implanting surgeon.

Claims

1. A heart valve comprising:

a substantially cylindrically shaped valve body formed from an inelastic,. deformable material having a substantially circular first opening therethrough, an exterior wall, and an interior wall surrounding said first opening, said interior wall defining an annular ledge;

one or more occluders pivotally mounted to said interior wall within said first opening, said occluders being dimensioned to engage said annular ledge which restricts further pivoting action of said occluders;

stiffening member formed from a substantially nonresilient material fitted about said valve body exterior wall; and

a sewing ring formed about said valve body comprising;

a rigid retainer means formed to be held about said valve body exterior surface for holding said sewing ring in position, said retainer means being positioned adjacent to said stiffening member;

shock absorbing means formed from a rubber-like material disposed between said stiffening member and said retainer means for absorbing and cushioning impact between said member and said retainer means;

cushioning member formed from a rubber-like material which extends out from said exterior surface of said valve body; and

a length of fabric surrounding said sewing ring.

2. The heart valve of claim 1 wherein said exterior wall of said valve body is formed with a groove into which said stiffening member fits.

3. The heart valve of claim 1 wherein said shock absorbing means is an O-Ring positioned between said retainer means and said stiffening member.

4. The heart valve of claim 1 wherein said shock absorbing means is silicone gel positioned between said retainer means and stiffening member.

5. The heart valve of claim 3 wherein said O-ring is formed from silicone.

6. The heart valve of claim 5 wherein said valve body is formed from pyrolytic carbon.

7. The heart valve of claim 6 wherein said stiffening member is an annular shaped body.

8. The heart valve of claim 7 wherein said rigid retainer means is an annular shaped body formed to snappily engage said stiffening member.

9. The heart valve of claim wherein said stiffening member includes a chamfered surface across which said rigid retainer means is cammed.

10. The heart valve of claim 9 wherein said rigid retainer means is formed with an extension defining an annular groove for receiving said stiffening member, said extension including a portion which engages and cams across said stiffening member chamfered surface to snappily engage said stiffener means.