RESUSCITATOR ARRANGEMENTS AND FLOW MONITORING

摘要

A patient valve (31) for use with a resuscitator (1) has a first valve (45) opened by expiratory pressure and a second valve (71) downstream of the first that is opened by gas pressure passed by the first valve during expiration. Two pressure monitoring channels (32) and (33) extend from opposite sides of the second valve (71) to respective pressure sensors (320) and (330). A processor (340) receives the outputs of the sensors (320) and (330) to compute a differential pressure signal from which an indication of expiratory gas flow is derived. Expiratory tidal volume is derived by integrating the flow over time.