Medical device expiration date: unknown.Device manufacture date: unknown.(b)(4).Investigation summary: as no physical sample, picture sample, or lot number was provided for evaluation by our quality engineer team, a complete investigation could not be performed.A dhr review was not able to be completed as the lot number is "unknown".Investigation conclusion: complaints received for this device and reported condition will continue to be tracked and trended.Our quality team regularly reviews the collected data for identification of emerging trends.Root cause description: based on the limited investigation results, a cause for the reported incident could not be determined.
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