1
Charles M Gropper, Raymond A Ellestad: Pressure-limited, time-cycled pulmonary ventilation with volume-cycle override. Bear Medical Systems, Klein & Szekeres, July 30, 1996: US05540220 (158 worldwide citation)

A pressure-limited, time-cycled pulmonary ventilator includes a pressurized gas system that supplies respiratory gas to a patient at a selected inspiratory flow rate; an exhalation valve that (a) opens an expiratory flow path in response to the elapsing of a selected inspiratory time period, and (b) ...


2
Arieh S Halpern, Ioan T Oltean: Ventilator control system using sensed inspiratory flow rate. Bear Medical Systems, Klein & Szekeres, April 28, 1992: US05107831 (141 worldwide citation)

A ventilator control system is responsive to a flow rate signal from a flow rate sensor that senses the flow rate of gas to a ventilated patient. The ventilator control system provides an episode signal to a ventilator to actuate the ventilator to provide an assisted breath. The ventilator control s ...


3
Harold U Bartels, Finn Sveen: Humidifier system. Bear Medical Systems, Klein & Szekeres, November 11, 1986: US04621632 (139 worldwide citation)

A humidifier system including a humidifier chamber and heater assembly, microprocessor based control circuitry, and a housing for the control circuitry. The humidifier system is adapted to provide air at nearly 100 percent relative humidity and at a predetermined temperature (e.g. 35.degree. C.) to ...


4
Douglas F DeVries, Arie Cohen: Medical ventilator system. Bear Medical Systems, Howard J Klein, Gabor L Szekeres, July 9, 1985: US04527557 (118 worldwide citation)

A volume ventilator is disclosed which has a balloon valve type exhalation valve for permitting release of gases to the ambient environment during the exhalation period of artificial ventilation or spontaneous breathing, or when there is excess proximal pressure in the ventilator system. A pressure ...


5
Thomas P Westfall, Alberto Ruiz Vela, Anthony J Caterina, Clyde R Visser: Flow control system for medical ventilator. Bear Medical Systems, Klein & Szekeres, July 26, 1994: US05331995 (115 worldwide citation)

A system including the method employed, for controlling the flow of a pressurized gas through a variable orifice flow control valve in a pressurized gas conduit system, such as a ventilator, in response to either a desired flow rate/volume input signal, a desired pressure signal or both. With respec ...


6
Stanley E Fry: Servo-controlled demand regulator for respiratory ventilator. Bear Medical Systems, Howard J Klein, July 17, 1984: US04459982 (64 worldwide citation)

A mechanism is provided for a respiratory ventilator by which the gas-delivery mechanism of the ventilator can be caused to deliver gas to the patient either at a predetermined flow rate or at a rate directly controlled by the patient's instantaneous demand. The mechanism includes a pressure-respons ...


7
James W Casparie, Arieh S Halpern: Measurement of gas concentration in exhaled breath. Bear Medical Systems, Klein & Szekeres, December 3, 1991: US05069220 (60 worldwide citation)

A method for analyzing the concentration of selected constituent gases in the expiratory gas streams from a patient. The method includes the steps of: (a) measuring the flow rate of the expiratory gas stream to provide a flow rate signal; (b) generating a tidal volume signal in response to the flow ...


8
Alberto Ruiz Vela, Maurice J Brooks, Douglas F DeVries: Electronically-controlled gas blending system. Bear Medical Systems, Klein & Szekeres, July 29, 1986: US04602653 (59 worldwide citation)

A gas blending system includes a proportional mixing valve having a valve element movable between first and second limits of travel corresponding to a minimum and maximum percentage, respectively, of one of the gases in the blended mixture. The position of the valve element is detected by a detectio ...


9
Samir M Chaoui: Demand-responsive gas blending system for medical ventilator. Bear Medical Systems, Klein & Szekeres, October 27, 1987: US04702240 (54 worldwide citation)

A gas blending system for use with a medical ventilator blends a pressurized gas with ambient air for delivery to the ventilator in response to the ventilator's demand for gas during the gas intake phase of its cycle. The system comprises a demand valve that discharges a flow of the pressurized gas ...


10
Calin Ion Ciobanu, Donald Schaeffer: Variable orifice flow sensor. Bear Medical Systems, Stetina Brunda Garred & Brucker, October 26, 1999: US05970801 (51 worldwide citation)

A variable orifice flow sensor includes a flow conduit member defining a flow orifice and fluidly connecting first and second fluid flow ports, a flapper of magnetizable sheet metal that is mounted in the conduit member by a hinge portion so that the flapper angularly deflects out of the plane of th ...