Details of complaint: the biomedical engineer (bme) reported that the telemetry transmitter looked like it had overheated.The battery cover looked like it was warped, and the display had stress fractures from what they believed was from overheating.This was found at setup and was not in patient use at the time.An exchange was provided to the customer to resolve the issue on 06/25/2020.Service requested / performed: an evaluation was performed by nkc (a152-017501_zm-52_53_practicalusesimulation) for the zm-52/53 series regarding overheating of the device case when the battery short-circuit occurs at the battery spring.The state of the temperature increasing was viewed by the thermography.The conclusion of this evaluation was that the temperature battery increased right after the short-circuit.The temperature of the battery terminal partly increased, and the terminal protector was melted.The battery temperature terminal partly increased to 78.6 degrees in about 10 seconds after the incorrect insert and the temperature decreased to about 40 degrees after 30 seconds (about 40 seconds after the incorrect insertion) and the heat spread to the whole of the battery.This could be dissipated by the battery case, pouch, and gown which will act as thermal insulators.The operator's manual instructs the user to avoid contact of the transmitter to bare skin and to check if the transmitter is hot after inserting the batteries.Investigation summary: as per the hazard analysis document 0704-905438f, the overheating of the battery compartment could be caused due to a number of reasons, such as: ·the battery is inserted in a wrong polarity causing overcurrent ·battery is inserted forcibly, causing fire due to short-circuit of +/- terminals ·short-circuit between the +/- battery terminals ·user does not handle nimh secondary battery and a battery charger properly, causing a short-circuit of the +/- terminals investigation determined that the reported issue could have been caused due to incorrect usage and maintenance of the nk device.No further investigation is needed through the capa process.For older smdrs: the following fields are not applicable (na) to the mdr report: b2, b6, b7, d4 lot # & expiration date, d6a & d6b, d7b, f1 - f14, g4 device bla number, g5, g7, g8, h7, h9.The following fields contain no information (ni), as attempts to obtain information were made, but not provided: a2 - a6.Additional information: b4 date of this report.D9 device available for evaluation? g3 date received by manufacturer.G6 type of report.H2 if follow-up, what type? h3 device evaluated by manufacturer? h6 event problem and evaluation codes.H10 additional manufacturer narrative.
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