It was reported that during a routine maintenance of an oxylog 2000 plus, the unit started to emit white smoke from the back while being connected to a test lung.Afterwards, there was a high thermal event.The technician disconnected the unit from the hospital oxygen supply and put off the fire.He ended up with some minor bruises.No further consequences were reported.
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The investigation was based on the photos of the device after the event and the response to further questions.The affected device was requested, but has not been provided.Based on the photos and the description of event it could be concluded that likely an ignition in one of the battery cells of the lithium-ion battery was the cause for the high thermal event.It was further reported by the user that the battery was handled properly and not physically damaged.However, according to the instructions for use the battery was due for replace in (b)(6) 2019.As the material was not available for further analyses, a definite root cause could not be determined.In general, the lithium-ion battery for the oxylog incorporates state of the art technology to reduce possible risks and impact of a potential ignition.It has been developed to comply with the requirements of the international standard iec 62133 and passed all the required tests.The internal electronics and the housing of the device are made of materials which act as flame retardant.No similar case related to the same cause has been reported in the last 18 years.Therefore, this is considered an isolated case.
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