The returned device first time in for service about 8 months in the field and the failure resulted from unresponsive silence key.The device history record (dhr) review is not applicable or relevant because the results of the complaint investigation do not indicate a problem with the initial manufacture or prior repair of the device.Device manufactured in 2020.Operator of device and initial reporter also sent report to fda are unknown.No information has been provided to date.This remediation mdr was generated under protocol (b)(4), as a result of warning letter cms# (b)(4).
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