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The customer reported to olympus, that the retrieval nitinol basket broke when quarrying a stone inside the bile duct.It was reported that when moved it up and down to take in the stone, the strut stretched inside the bile duct and twisted into a u-shape.The issue was found during a therapeutic procedure.The customer noted that the procedure was successfully completed with a similar device.There were no reports of patient harm.
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This report is being supplemented to provide additional information including further information provided by customer and the legal manufacturer's final investigation.According to the customer, the intended procedure was an endoscopic retrograde cholangiopancreatography (ercp) and there was no delay in the procedure.A review of the device history record found no deviations that could have caused or contributed to the reported issue.Based on the results of the investigation, the cause may have been that the support wire was excessively angulated forming a loop which prevented the support wire from being retracted with the basket into the coil sheath when the control grip was pulled.However, the exact cause could not be determined.The issue can be detected/prevented by following the instructions provided in: from the instruction manual ¿ warning ·never use excessive force to operate the instrument.This could damage the instrument.·repetition of stone retrieval will deform and/or deteriorate this instrument.Deformation and/or deterioration may make it difficult to retrieve a stone or could cause the basket with stone engaged to become impacted in the body.If stone retrieval needs to be repeated in a single case, be sure to inspect the action and the appearance before each retrieval.Stop use if any abnormality (e.G., basket wire is cut or sheath is bent, etc.) is detected during the inspection.·do not open or close the basket while the forceps elevator of the endoscope is up.Otherwise, the support wire may form a loop.Do not withdraw the instrument from the bile duct while a loop is formed by the support wire.Otherwise, the looped distal end could damage the inside of the bile duct and cause mucosal injury.If a loop of support wire is observed, lower the forceps elevator, and open/close the basket.Olympus will continue to monitor field performance for this device.
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