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As reported by the field clinical specialist, there was difficulty pulling the balloon/delivery system back into the sheath during a transcatheter aortic valve replacement (tavr) procedure, the user decided to remove the delivery system and sheath as one unit.Upon withdrawal of the esheath from the delivery system, the seam was split on the expandable part of the sheath which showed a liner tear and distal tip split on the sheath.There was no report of any injury to the patient.
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A supplemental mdr is being submitted for correction and additional information base on the device evaluation.The following sections of this report have been updated: corrected h.6 component codes and investigation conclusions and added new information to h.6 type of investigation and investigation findings.The esheath was not returned to edwards lifesciences for evaluation.Without the device returned for evaluation, visual inspection, functional testing, and dimensional analysis were unable to be completed.Imagery was provided from the site and revealed tortuosity was present in patient vasculature.As no device was returned and there is no evidence to support a manufacturing/design defect potentially contributed to the complaint, a manufacturing mitigation review is not required.A device history record review (dhr) was performed and did not reveal any manufacturing nonconformance that would have contributed to this complaint event.The instructions were reviewed; instruction for use (ifu) for esheath ifu, device preparation manual, procedural training manual and no ifu/training deficiencies were identified.The complaints for sheath distal tip split and sheath liner torn were confirmed empirically.As the device was not returned, engineering was unable to perform any visual inspection, functional testing, or dimensional analysis.Therefore, the presence of a manufacturing non-conformance was unable to be determined.However, review of the dhr and lot history, and complaint history review did not provide any indication that a manufacturing non-conformance would have contributed to the complaint event.A review of ifu/training materials revealed no deficiencies.Furthermore, there was no report of any issues with the sheath during device unpacking or preparation.As reported, "26mm s3u valve was fully deployed in a moderately calcified annulus when the valve balloon ruptured.There was difficulty pulling the balloon/delivery system back into the sheath, so it was decided that the delivery system and sheath would be removed as one unit.Upon withdrawal of the esheath from the delivery system, the seam was split on the expandable part of the sheath".The balloon burst likely altered the balloon profile and made the device more susceptible to get caught on the sheath tip, which could have subsequently resulted in a liner tear and splitting of the distal tip.Therefore, available information suggests procedural factors (withdrawal of burst balloon) could have contributed to the events.An existing technical summary has been documented for root cause analysis on sheath shaft liner tears with normal liner expansion.In this technical summary, a review of liner tear complaint investigations on returned devices over a two-year period found that patient / procedural factors (e.G.Access vessel tortuosity / calcification or withdrawal of a burst or torn balloon) are likely the contributing factors for sheath shaft liner tears.As discussed above, withdrawal of balloon burst may have caused the sheath liner tear due to burst balloon material catching on the sheath tip.The force required to withdraw the balloon burst could then lead to tearing or weakening of the sheath liner.Additionally, per the provided 3mensio imagery review, the patient's access vessels were tortuous.Tortuous patient anatomy can create sub-optimal angles that can lead to non-axial alignment.The delivery system or balloon catheter can potentially catch on to liner of the sheath and tear the liner upon removal.A balloon burst could also make it difficult to deflate the balloon and would alter the balloon profile during removal.The force required to withdraw the balloon could then lead to tearing or weakening of the sheath liner.See technical summary for further details on root cause analysis.The technical summary demonstrated that there were no deficiencies in the ifu/training manuals and that the mitigations in place during manufacturing support that it is unlikely that a manufacturing non-conformance contributed to the complaint.It should be noted that these mitigations (from manufacturing and the ifu/training manual), as identified in the technical summary, are still in place.Therefore, available information suggests patient factors (tortuosity) and procedural factors (withdrawal of burst balloon) could have contributed to the events.Since no product non-conformances or ifu/training deficiencies were identified during evaluation, a product risk assessment (pra) escalation or a corrective preventative action (capa) is not required.
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