(b)(4).Device evaluated by mfr.: device was returned for analysis.Microscopic and tactile examination revealed numerous kinks in the hypotube.Microscopic examination revealed a full separation at the collar/proximal location, with additional damage to the collar.Microscopic and tactile examination revealed the ptfe (polytetrafluoroethylene) was completely pulled out from the collar.The inner diameter was measured at the distal tip and found to be within specifications.Microscopic inspection found no irregularities or defects on the tip.The manufacturing batch record review confirmed that the device met all material, assembly and performance specifications.The most probable root cause is operational context as device performance was limited due to anatomical procedural factors.(b)(4).
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