(b)(4).Upon receipt the device was visually examined for any damage that might have been caused from abuse/misuse/and/or subjected to any toxic environments that could cause physical or chemical damage to the device.The melted area of the expiratory circuit was identified and confirmed.Said area is approximately one (1) inch long and has a smear texture.A device history record review could not be conducted since the lot number was not provided.The instructions for use for this device were reviewed.The ifu warns the end user, "do not place tubing on patient's skin, do not cover tubing with sheets, blankets, towels, clothing, or other materials".All circuits are 100% functionally and visually inspected for proper operation at the time of manufacturing, so it is unlikely that this defect was present at that time.The complaint was confirmed based upon the sample received.However, the defect was discovered after being in use.Therefore, based upon the circumstances as reported in the complaint and the damage observed on the returned sample, operational context caused or contributed to this event.A corrective action is not required at this time.
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