PNEUMATIC RESPIRATOR COMPRISING A FLUID-OPERATED ALTERNATING CHANGEOVER SWITCH

摘要

Pneumatic respirator comprising two stages in series. The first stage is a pneumatically operated changeover gas switch an exit of which is connected to a chamber the volume of which may be varied in order to vary the alternation frequency of the switch. The pressure inside the chamber actuates a valve which alternately opens and closes a passage between the respiratory passages of the patient and the source of gas to be insufflated.