Additional information sections: b5, d10, h3, h6, h10.The reported event of the sewing cuff beginning to pull away from the valve was confirmed.The investigation found one of the loops of the suture holding the cuff in place was broken, which could cause loosening of the cuff.The knots of the suture were intact and no evidence was found to suggest that the damage occurred during manufacturing.The device history record was reviewed to ensure that each manufacturing and inspection operation was performed and the product met all specifications.The cause of the reported event could not be conclusively determined.
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