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The waa heat related failure questionnaire was reviewed for potential causes of the reported issue.The patient wearing the device directly on the skin has been ruled out as a potential root cause.However, the patient was not using the usb charger and cable provided to recharge the transmitter assembly.Per transmitter assembly instructions for use for freedom neurostimulation systems, 05-20915 rev.9, "use only the usb charger and cable provided to recharge the transmitter." the transmitter assembly associated with the complaint was returned for investigation.The investigation found burned components including: d19, u2, u20, u24.Due to the damaged components, the device will not operate and thermal imaging of the device could not be performed.In addition, the investigation found a damaged component as l12 was broken.The stimulator is used to treat pain.The cause of reported issue is due to non-compliance to the ifu as the patient was not using the usb charger and cable provided to recharge the transmitter assembly (user error-patient).Refer to capa-2024-0020 for additional investigation details for the damaged component l12.Refer to issue-(b)(4) for additional investigation details and risk assessment for the incorrect charger being used causing burning pcb components.
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