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A visual inspection was performed.The visual inspection revealed a cut on the third leaflet, some signs of surgical instruments (i.E.Forceps) on the second leaflet and damage on the post 3 was visible.The thickness of the pericardium tissue was measured and confirmed that the tissue met all specifications required for proper valve coaptation and functionality.The review of the functional test retrieved from dhr, confirmed that the valve leaflets opened fully and coapted properly, showing synchronous opening and closing with smooth, continuous motion and no leaflet fluttering: the valve met the required specifications at the time of the release.The performed hydrodynamic test on the returned valve crown prt sn (b)(4) showed the valve leaflets opened and closed fully with proper coaptation.The returned valve was then disassembled in order to verify the integrity of the stent: it resulted circular without evidence of relevant eccentricity or deformation.The review of the manufacturing and quality control data filed in the device history record of the returned crown prt valve sn (b)(4) confirmed that each manufacturing and inspection operation was followed by the appropriate signature and date, indicating that the process was performed in accordance with livanova specifications, including the mentioned functional test.Based on the performed analysis, resulting in a normal behavior of the valve, the reported issue cannot be explained by any factor intrinsic in the involved device.The valve abnormalities identified above could reasonably be related to the explant procedure, however it is not possible to totally exclude that the damages occurred during the implant steps.
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