Abstract: In artificial respiration apparatus of the type which uses a breathing tube extended from the apparatus to a patient. An alarm system is incorporated into the apparatus which responds to a disruption of the cyclic air pressures therein through connection with an air supply passageway in the respirator. The invention uses a sensor tube, extended from the respirator apparatus to the remote end of the breathing tube. This sensor tube connects with the alarm system so it may respond to a disruption of the cyclic pressures at this remote end of the breathing tube. A selector valve at the respirator apparatus connects the alarm system with either the air supply passageway in the apparatus or with the sensor tube. The sensor tube terminates as a jack which is inserted into a socket in the selector valve. The alarm responds to pressures in the air supply passageway when the jack is not in the socket. However, the alarm responds to pressures in the sensor tube when the jack is inserted into the socket.

Abstract: In an artificial respiration apparatus, especially in positive pressure types, it has been found that an extension lead for a respirator alarm system is desirable. This lead will extend beyond the respirator to permit a patient to initiate an alarm when help is needed. The lead is connected to the alarm initiating circuit in the respirator in a manner which makes its connection or disconnection optional with the alarm system in the respirator working in its regular manner when the extension lead is disconnected.

Abstract: The present invention relates to improvements in the portable, positive-pressure artificial respiration apparatus and, more particularly, to improvements in the air passageway systems of such apparatus by using a dual control valve.

Abstract: This invention is a positive pressure respiratory apparatus to cyclically pump proper volumes of air for inspiration by a patient, through a breathing tube extended to the patient. The unit, formed in a compact package, includes a pump, a piston within a cylinder and a breathing tube extending from the cylinder to the patient. The cylinder volume does not greatly exceed the proper volume of air for inspiration by a patient. The piston is cyclically reciprocated within the cylinder at a rate which corresponds to natural or selected inspiration and exhalation breathing cycles of the patient, and this piston moves in the cylinder a distance sufficient to displace the aforesaid volume of air. A valving means permits air to enter the cylinder during the patient's exhalation cycle of breathing when the piston moves away from the cylinder end and to confine the flow of air to the breathing tube during the inspiration cycle, when the piston moves towards the cylinder end wall.