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The device was returned for analysis.The reported mechanical jam and the reported activation failure were unable to be confirmed.Production record and corrective and preventive actions (capa) reviews were performed and revealed no indication of a product quality issue.Additionally, a review of the complaint handling database identified no other incidents from this lot.Potential causes for activation failure and resistance with the thumbwheel include, but are not limited to, manufacturing, anatomical conditions; deployment technique and/or damage to the device deployment mechanisms (handle components/shaft lumens/ratchet), or inadequate pre-dilatation of the stricture.The product risk assessment identifies this as a foreseeable event; as such, design and manufacturing controls and mitigation have been established for potential causes.The investigation determined the reported difficulties appear to be related to circumstances of the procedure as it is likely that the distal sheath of the delivery system was entrapped or bent in the mildly calcified, mildly tortuous and 90% stenosed anatomy such that the ratchet was unable to properly/fully engage the stent resulting in difficulty advancing the thumbslide/ mechanical jam and resulting in the reported activation/deployment failure.Based on the reported information and results of the complaint investigation there is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
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