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The Annals of Thoracic Surgery, Vol 45, 554-558, Copyright © 1988 by The Society of Thoracic Surgeons

ARTICLES

Initial experimental experience with a "replaceable" cardiac valve prosthesis

DK Cooper, WN Wicomb, GM Gould and D Boonzaier
Department of Cardiothoracic Surgery, Groote Schuur Hospital, Cape Town, South Africa.

An easily "replaceable" cardiac valve prosthesis has been designed. It consists of two parts: (1) a sewing ring incorporating a circlip and (2) a functioning valve (either mechanical or tissue). The circlip is encased in a sewing ring, which is sutured into the natural valve annulus, and grips the functional part of the prosthesis, thereby preventing dislodgment. A simple instrument has been designed to open the circlip a few millimeters to allow easy removal or insertion of the functional element. This sewing ring/circlip with the functional element of a Bjork-Shiley prosthesis was used in 10 baboons undergoing mitral valve replacement. Removal and replacement of the functional element was carried out at a second operation between 1 and 12 weeks later. There were no operative deaths. Baboons were electively killed one day to twelve months after the second operation. There were no complications related to the prosthesis; cardiac catheterization showed normal hemodynamics before and after the second operative procedure.




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Copyright © 1988 by The Society of Thoracic Surgeons.