Abstract: A ventilator with an inhalation phase and an exhalation phase in its operative cycle having an inlet adapted to be connected to a supply of gas under pressure and first, second and third outlets. A servo controller is provided having an inlet and an outlet with control valve means movable between open and closed positions to control the flow of gas from the inlet to the outlet. Means is provided for supplying gas from the first outlet to the patient adapter. An exhalation valve assembly is coupled to the patient adapter and is movable between open and closed positions. Means is provided for supplying gas from the second outlet to the exhalation valve assembly to maintain the exhalation valve assembly in a closed position during the time the gas is being supplied from the outlet of the servo controller.

Abstract: Portable air compressor system for a respirator and adapted to be operated from a source of power. A plurality of compressors are provided. Each compressor has a fan for causing air to move over the compressor and has an outlet supplying compressed air. A cooling coil is provided having an inlet and an outlet and is positioned so that the fans of the compressors force air over the cooling coil. Piping connects the outlets of the compressors to the inlet of the cooling coil. A water trap is provided. Piping connects the outlet of the cooling coil to the water trap. An air reservoir is provided which has an inlet that connects it to the water trap and an outlet which is adapted to be connected to the respirator. A pressure regulator is provided which is in communication with the reservoir. A pressure switch is provided which is connected to the regulator and at least one of the compressors for halting operation of said at least one compressor when a predetermined pressure is reached in the reservoir.

Abstract: Ventilator having an inhalation phase and an exhalation phase in its operative cycle for use with a source of gas under pressure. A demand flow accelerator is responsive to the pressure of the gases in a breathing head assembly and provides additional gases to the breathing head assembly when the pressure of the gases in the breathing head assembly falls below a predetermined pressure. A sensor is also provided responsive to the pressure of the gases in the breathing head assembly for supplying gases to the breathing head assembly when the pressure of the gases in the breathing head assembly falls below a predetermined value to cause the patient to exhale against a substantially constant positive airway pressure. An additional sensor is also provided which is sensitive to the airway pressure being sensed for bleeding gases from the breathing circuit when pressure greater than a predetermined pressure are reached.

Abstract: Ventilator having an inhalation phase and an exhalation phase in its operative cycle for use with a source of gas under pressure. A master sequencing cartridge having an inlet adapted to be connected to a source of gas under pressure and an outlet is provided. The cartridge has a valve member movable between open and closed positions to control the flow of gas from the inlet to the outlet. The cartridge is provided with a diaphragm capable of operating under differentials in pressure for causing movement of said valve member. A breathing circuit outlet is provided and tubing is provided for coupling the breathing circuit outlet to the outlet of the master sequencing cartridge. A volume-rate control valve assembly is provided for controlling the movement of the valve member of the master sequencing cartridge between open and closed positions.

Abstract: Ventilator with an inhalation phase and an exhalation phase in its operative cycle having a servo controller with an inlet adapted to be connected to supply gas under pressure and also having an outlet. The controller has control valve means movable between open and closed positions to control the flow of gas from the inlet to the outlet of the servo controller. The control valve means is an open position during the inhalation phase of the ventilator and in a closed position in the exhalation phase of the ventilator. Means is provided for supplying gases to the patient from the servo controller until a predetermined pressure has been reached. After the predetermined pressure is reached, means is provided to supply an additional flow of gases to the patient to provide an inspiratory apneustic plateau for the patient. After a predetermined period of time, the patient is permitted to exhale and thereafter the same cycle is repeated.

Abstract: A valve device is disclosed for unloading pressure from a compressor of the type utilized in a medical respirator. The device is formed with a cylindrical chamber containing a compressible elastomeric member. Inlet and relief ports of the valve open into the chamber, and the inlet port is connected with the outlet of the gas compressor. Bistable actuator means is provided for moving a plunger within the chamber which in turn causes the cylindrical member to assume either a compressed or uncompressed state. In its uncompressed state a radial clearance between the outer wall of the elastomeric member and the chamber provides a flow path between the inlet and relief ports to bleed pressure from the compressor. In its compressed state the elastomeric member expands to occlude the flowpath and prevent pressure bleed-off from the compressor.

Abstract: A respirator with an inhalation phase and an exhalation phase in its operative cycle having an inlet adapted to be connected to a supply of gas under pressure and first and second outlets.A device is provided for establishing a positive pressure above atmospheric against which the patient must exhale during the exhalation phase for a predetermined period near the end of the exhalation phase. A device is provided for terminating the application of positive pressure so that the patient is exposed to ambient atmospheric pressure prior to initiation of the inhalation phase. Inspiratory flow acceleration means is provided for supplying additional gases to the first outlet during the inhalation phase. A control device is provided for establishing the length of the inhalation phase and includes an auxiliary reservoir for collecting gas and means for bleeding off the gas from the auxiliary reservoir whereby the exhalation time can be adjusted without being adversely affected by the pressure of the inlet gas.

Abstract: A connector assembly is disclosed for rapidly forming a secure fluid-tight connection in a fluid circuit. The proximal ends of the fittings are adapted for connection with tubing, hose or other fittings of the circuit. An annular connector cap is formed at its opposite ends with inwardly projecting detent shoulders. One detent shoulder is sized for engagement in an annular locking groove formed about the outer surface of the female fitting while the other detent shoulder is sized for locking engagement with one of a series of annular locking barbs formed about the male fitting. Inclined camming surfaces are associated with the barbs for camming the corresponding detent shoulder radially outwardly and thereby facilitate locking of the detent with a selected barb which securely holds the fittings together in fluid-tight relationship.

Abstract: A ventilator with an inhalation phase and an exhalation phase in its operative cycle having an inlet adapted to be connected to a supply of gas under pressure and first, second and third outlets. A servo controller is provided having an inlet and an outlet with control valve means movable between open and closed positions to control the flow of gas from the inlet to the outlet. A conduit system is provided for supplying gas from the first outlet to the patient adapter. An exhalation valve assembly is coupled to the patient adapter and is movable between open and closed positions. A conduit system is provided for supplying gas from the second outlet to the exhalation valve assembly to maintain the exhalation valve assembly in a closed position during the time the gas is being supplied from the outlet of the servo controller.