During usage the exhalation vent may become covered or blocked when assembling hme or filter on the connector.In placing the hme or filter on the connector the tubing may be pushed up the connector.This force would overcome the tubing/ connector interference fit and allowed the tube to move.This could potentially cover the exhalation port.There were no patient issues reported during this evaluation.The instructions for use provide safe and effective directions.The instructions for use state "when assembling any connectors use a push and twist action to ensure a secure fit".It also states during set up "secure all connections, pressurize device and check for leakage and blockage prior to use".There were no patient issues reported during this usage.
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