Breathing apparatus comprising a body in the form of a mask shaped to be worn over a portion of a user's face, a breathing passage formed in the body having an outlet in one end only in communication with one of either the nose or the mouth of the wearer and having an inlet at the other end thereof, a container holding a quantity of gas for breathing adapted for connection to the mask body with the container outlet in communication with the breathing passage and the container releasing a flow of...

Breathing apparatus is disclosed in which a selected portion of each exhalation is returned to the inlet side for rebreathing. The percentage of each exhalation rebreathed varies from exhalation to exhalation and is determined in accordance with the detected magnitude of the preceding inhalation. Breathing mixture is withdrawn by the user from a reservoir which is in communication with a cylinder having a spring loaded piston therein. The pressure in the reservoir, and hence in said cylinder, at...

Breathing apparatus of the closed- or semi-closed-circuit type includes a carbon dioxide absorber (8) which creates troublesome heat in operation. Apparatus giving acceptable breathing gas temperature incorporates an evaporative cooler unit (20), and a pump utilizing the diaphragn plate (15) of the breathing bag (3), the pump inducing an air flow over the evaporative cooler unit.

Breathing apparatus comprising a mask shaped to contact a user's face and define a breathing chamber in communication with the nose of the user, a gas supply container carried by the mask having a movable valve control element, and an operator manipulated by the mouth of the user for moving the control to open the valve to introduce gas to the breathing chamber. The gas supply is controlled by the mouth of the user and inhaling from and exhaling to the chamber is through the nose of the user. Th...

A breathing tube for underwater activities comprising an elongated tube having a free end and an opposite mouth-receiving end which is attached to the tube to a users underwater mask. The tube is attached to the mask by a tubular sleeve in free slideable engagement with the tube for relative sliding displacement. The sleeve is connected to the mask. The tube is also provided with a stop for preventing disengagement between the sleeve and the tube.

A breathing apparatus is described for supplying pulses of a breathable gas to a patient; the apparatus comprises a gas inlet (10) connectable to a source of breathable gas, an outlet (37) connectable to provide gas to the patient, a gas flow passage (14,15,34,36) extending between the inlet and the outlet, a main valve (16) located in the gas flow passage for interrupting the flow of gas to the outlet, a throttle (38) in the flow passage downstream of the main valve, a gas reservoir (42) and a ...

The breathing apparatus disclosed includes a first connector structure which provides ports for connection to a supply of fresh breathing gases, to an afferent gas tube and to an afferent gas bag. The first connector structure also provides a port to which a ventilator can be connected, a port to which an efferent gas tube can be connected, and a connection to an efferent gas bag. The afferent gas tube is of larger diameter than the efferent gas tube. The apparatus further includes a second conn...

A positive pressure filter respirator includes a full face mask comprising an outer mask 1 and an inner orinasal mask 2. A filter canister 5 is screw mounted to an air inlet 4, and a centrifugal fan 6, which is driven by a battery operated motor 7, is so arranged as to draw air through the filter canister 5 into the outer mask 1. The filter life and the battery life are extended by the use of a pressure responsive means which responds to the difference in pressure between the pressure in the int...

A universal manual resuscitator vavle which includes a filter is provided by which breathing circuit system elements can be protected from contamination by contaminants present in exhalation gases. In one embodiment, the valve assembly includes a valve flap which is attached at opposite edges and which is resiliently urged into a position such that an exhalation stack is closed in mode of operation.

Breathing sensor that monitors the inhalation and exhalation of air by sensing the flow of air from a patient's nostrils or by expansion and contraction of the chest, abdomen, side or back. The respiration sensing is changed to an electrical signal that indicates and provides an output signal for monitoring the breathing function. The sensor comprises a housing with a tubular passage containing a ball, a tube connection, a light source, means for detection when the ball interrupts the light sour...