Qn# (b)(4).The actual device was returned and sent to the manufacturing site for investigation.The manufacturing site reports: "the customer returned one 133300 rusch greenled handle: medium for investigation.The handle was returned with a heine mac 3 f.O blade attached to it.Visual examination did not reveal any obvious defects or anomalies, as the handle device appears typical.The handle and blade were badly stuck, as reported in the complaint notification.We tried to dismantle the blade with ordinary effort, but that could not be helped in any way.We applied extra force with the help of a plastic hammer to dismantle the blade from the handle and with this effort, we were finally able to remove the blade from the handle.All edges of the returned blade and handle were examined, and it was noted that the one of the steel ball of the blade (heine mac 3 f.O blade) was damaged and there was deep dent on the steel ball, and it was also noted that there was no spring back action force in the steel balls.The functional inspection was performed per laryngoscope ifu by pushing downward on the fresh blade to release it from the handle, part of the instructions for use (ifu) were reviewed for this investigation.The handle device was functional tested with fresh blade by following the product guidelines.No problem found on customer returned handle device.The device history record for lot 23012701 was reviewed and no issue that could have contributed to the reported failure was noted.The device was manufactured according to release specification." the complaint cannot be confirmed.The device was manufactured according to release specifications and tested 100% for functional testing prior to shipment to the customer.No problem was found with the returned handle.The device was found to be fully functional with different size blades.Other remarks: n/a; corrected data: n/a.
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