Multiple Component Prosthetic Heart Valve Assemblies and Methods for Delivering Them

Abstract

Multiple component heart valves and apparatus and methods for implanting them are provided. The heart valve generally includes a first annular prosthesis and a second valve prosthesis. The first prosthesis includes an annular member compressible from a relaxed condition to a contracted condition to facilitate delivery into a biological annulus, the annular member being resiliently expandable towards the relaxed condition. The first prosthesis also includes guide rails extending therefrom. The second prosthesis includes an annular frame, valve elements, and receptacles for receiving respective guide rails therethrough when the second prosthesis is directed towards the first prosthesis. In addition, a valve holder may releasably carry the valve prosthesis that includes channels for receiving respective guide rails therethrough when the guide rails are received through the valve prosthesis. A delivery tool is also provided that includes an actuator for selectively compressing the annular member into the contracted condition.

Description

RELATED APPLICATION DATA[0001]This application claims benefit of co-pending provisional application Ser. No. 60 / 746,038, filed Apr. 29, 2006, and 60 / 914,742, filed Apr. 29, 2007, the entire disclosures of which are expressly incorporated by reference herein.FIELD OF THE INVENTION[0002]The present invention relates generally to heart valves that may be implanted within a patient, and, more particularly, to multiple component heart valve assemblies that may be assembled together, and to apparatus and methods for using them.BACKGROUND[0003]Prosthetic heart valves can replace defective human valves in patients. For example, one piece valves have been suggested that include sewing rings or suture cuffs that are attached to and extend around the outer circumference of a prosthetic valve. In addition, multiple component valves have also been suggested that include a sewing ring that is separate from a valve component. The sewing rings of either type of prosthetic valve can be tedious and t...

AI Technical Summary

Benefits of technology

[0016]In addition or alternatively, the first prosthesis may include an annular member, a sewing cuff extending radially from the annular member, and / or a skirt to enhance scaling between the first prosthesis and surrounding tissue. In one embodiment, the first prosthesis may also include a collar extending upwardly from the annular member for receiving the valve member. The sewing cuff and / or collar may be formed from resiliently flexible material, e.g., silicone or polyester film, covered with a fabric covering.

Problems solved by technology

The sewing rings of either type of prosthetic valve can be tedious and time consuming to secure within a target site, i.e., within an annulus of a heart where a natural heart valve has been removed.

Consequently, this procedure can be very complicated, requiring management and manipulation of many sutures.

The complexity of the procedure also provides a greater opportunity for mistakes and requires a patient to be on cardiopulmonary bypass for a lengthy period of time.

Because the annulus of the heart may not match the circular cross-section of the sewing ring and / or prosthetic valve, the prosthetic valve may not fit optimally within the annulus.

As a result, natural blood hemodynamics through and around the valve may be impaired, resulting in clotting, possible emboli production, and eventual calcification of the valve structure.

When a mechanical or prosthetic valve is then attached to the sewing ring, however, the valve and sewing ring may not mate together effectively, e.g., if the shape of the sewing ring has been distorted to conform to the annulus, which may also impair natural blood hemodynamics, create leaks, and / or otherwise impair performance of the prosthetic valve.

Thus, conventional procedures for implanting prosthetic heart valves may not be compatible with less invasive or minimally invasive procedures.

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