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Rotatable cuff assembly for a heart valve prosthesis
| Details |
Inventors: Vanney, Guy P.; Girard, Michael J.; Kramlinger, William R.; Runquist, Jonas A.; Anderson, Kimberly A.; Moore, Scott D.; Allan, Bob; Graf, James E.;
Assignee: St. Jude Medical, Inc. (St. Paul, MN)
Primary Examiner: Yu; Mickey
Assistant Examiner: Cuddihy; Francis K.
Attorney, Agent or Firm: Finucane, Esq.; Hallie A. Westman, Champlin & Kelly, P.A.
The invention provides a sewing cuff assembly for mounting to the body of a heart valve prosthesis. The sewing cuff assembly comprises a resiliently deformed spring for exerting a force directed toward the orifice structure. When a torque is applied to the valve, the force results in a rotation-resisting torque sufficient to resist rotation during normal operation of the valve after implantation but low enough to permit assisted rotation, as during surgery. |
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DETAILED DESCRIPTION The invention provides a heart valve prosthesis in which the sewing cuff is rotatably mounted to the valve body by a resiliently deformed spring which is disposed along a circumferential surface or annular seat of the valve body.
The spring exerts a controlled force on the valve body, which results in a rotation-resisting torque when an outside force is applied to the valve.
The rotation-resisting torque is sufficient to resist rotation during normal operation of the valve after implantation but low enough to permit the surgeon to rotate the valve during implantation.
Preferably, the valve body includes annular shoulders along either side of the annular seat.
Once assembled between the shoulders, the spring is held in axial alignment with the annular seat by the shoulders.
The deformation of the spring may be provided as a result of the structural relationship between the spring itself and the annular seat, as when the spring is smaller than the annular seat in an unstressed state, and is expanded to fit about the valve body.
Helical springs having square, round or rectangular cross-sections are particularly suited for this design in that the coils of the helix may readily be formed to a smaller diameter yet can be manually expanded for coiling around the valve body.
Once in place, the spring exerts a radially-inward force on the annular valve seat.
The inventive valve design also preferably includes a restraining ring element which is disposed circumferentially about the spring.
The restraining ring element restrains outward expansion of the spring, and, therefore, minimizes gaps between the fabric of the sewing cuff and the valve body when, for example, a concentrated separation force is applied to the sewing cuff during preparation and/or implantation.
Thus, the restraining ring element provides excellent cuff retention and increases the overall integrity of the heart valve.
In addition to preventing separation of the sewing cuff from the valve, the restraining ring can also be used to assist in the resilient deformation of the spring
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