The results of this investigation indicated the mechanical valve was able to be manually rotated without difficulty.Both leaflets were fully mobile and no damage was found to the orifice, recessed pivot areas, or leaflets.There was no evidence found to suggest there was an intrinsic defect in the valve, as supported by the review of the device history record and the analysis performed.The cause of the reported event remains unknown.However, information from the field indicated a smaller 25 mm masters series valve was implanted.
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