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Section e initial reporter: medtronic field service engineer reported on behalf of the customer h3 device evaluation summary: medtronic conducted an investigation based upon all information received.It was reported that this ht70 ventilator did not pass cal ibration.One ht70 ventilator was returned to medtronic for analysis.Ventilator logs were reviewed and several entries of expiratory flow sensor calibration failure were noted.The tubing/connections were checked and found that the tubing connecting the on/off solenoid valve to the pump and manifold assembly was disconnected.The tubing was then connected properly.Additionally, it was noted, the power-off/shut-down alarm sounded audibly weak and shortly thereafter, the alarm went silent and therefore, the control board was replaced.The unit passed all calibrations and tests per the manufacturer's specifications.The cause of the reported event was an issue with the tubing connecting the on/off solenoid valve to the pump and manifold assembly.This event is included in a data monitoring plan.The cause of the secondary issue of the shutdown alarm sounded audibly weak was isolated to fault on the control board.Further action was not required because the ventilator is within the scope of the capacitor c159 field corrective action which can result in failure of the shutdown alarm to annunciate.The ventilator is within the scope of a field corrective action.Medtronic submits this report to comply with fda regulations 21 cfr parts 4 and 803.Medtronic has made reasonable efforts to provide as much relevant information as is available to the company as of the submission date of this report.This report does not constitute an admission or a conclusion by fda, medtronic, or its employees that the device, medtronic, or its employee caused or contributed to the event described in the report.Medtronic will submit a supplemental report if additional relevant information becomes known.
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