초록 ▼

A medical ventilator is disclosed for switching and mixing oxygen with air in a driving and oxygen mixing means (2) and delivering the mixture to a gas flow control apparatus (3) for application directly to a patient breathing apparatus (5) or to storage in a bellows reservoir (81) of a continuous p

A medical ventilator is disclosed for switching and mixing oxygen with air in a driving and oxygen mixing means (2) and delivering the mixture to a gas flow control apparatus (3) for application directly to a patient breathing apparatus (5) or to storage in a bellows reservoir (81) of a continuous positive airway pressure facility (4). The ventilator is equipped with a control module (1) having directly set control adjustments (6-9, 105-112) for determining respiratory rate, inspiration-to-expiration ratio, oxygen concentration and the prescribed minute volume of the oxygen mixture to be delivered to a patient. The adjustment control circuitry which performs the calculations, logic and drive operations for switching and mixing oxygen in plural chambers (14, 18, 29, 30) of module (2), the switching of the mixture through module (3), and sensing fill and refill needs of reservoir (81). Module (4) includes apparatus (83, 84) for exerting a positive pressure on the oxygen in reservoir (81).

대표청구항 ▼

A volume ventilator for artificial ventilation of a patient during inspiration and expiration cycles of the ventilator comprising patient breathing apparatus, gas flow control apparatus operably connected to said patient breathing apparatus for supplying a delivered air/oxygen gas mixture to said br

A volume ventilator for artificial ventilation of a patient during inspiration and expiration cycles of the ventilator comprising patient breathing apparatus, gas flow control apparatus operably connected to said patient breathing apparatus for supplying a delivered air/oxygen gas mixture to said breathing apparatus, a driving and air/oxygen mixing means operably connected to said flow control apparatus and controllable for delivering a prescribed mixture of air/oxygen gas to said flow control apparatus, and control means operably connected to said flow control apparatus and said driving and air/oxygen mixing means including adjustment means cooperating with said flow control apparatus and said driving and air/oxygen mixing means for setting a prescribed minute volume, respiratory rate and inspiration-to-expiration ratio, said control means comprising control circuitry activated by settings of said adjustment means for furnishing control signals corresponding to said prescribed minute volume, respiratory rate and inspiration-to-expiration ratio for controlling the driving and air/oxygen mixing means to mix and deliver said air/oxygen gas mixture to said gas flow control apparatus and for controlling the operation of said gas flow control apparatus for supplying to said patient breathing apparatus said air/oxygen gas mixture at said prescribed minute volume, respiratory rate and inspiration-to-expiration and the air/oxygen concentration of said predetermined volume of air/oxygen gas mixture, said driving and air/oxygen mixing means comprises a driving chamber, said control means comprises a plurality of flow valve means actuable for delivering oxygen gas from a source to said driving chamber, said control circuitry further comprises circuitry responsive to furnished ones of said control signals for actuating predetermined ones of said valve means for delivering said oxygen gas to said driving chamber during an inspiration cycle of said ventilator, and said driving and air/oxygen mixing means further comprises a driving chamber for receiving said oxygen under pressure during an inspiration cycle of the ventilator from said supplying means, a storing chamber for storing the oxygen receivable from said driving chamber, valve means controlled by said control circuitry during an expiration cycle of said ventilator for communicating the oxygen from said driving chamber to said storing chamber, a mixing bellows mounted within said storing chamber and having an interior bellows mixing chamber for storing an air/oxygen mixture, valve means controlled by said control circuitry during an inspiration cycle of said ventilator for communicating some or all of the oxygen from said storing chamber to said bellows mixing chamber, valve means actuatable during an inspiration cycle of said ventilator in response to differential pressures for exhausting oxygen in said storing chamber to the atmosphere and for mixingly admitting air into said bellows mixing chamber, a drive bellows mounted within said driving chamber and having an interior drive bellows chamber for storing an air/oxygen mixture, means operable during an expiration cycle of said ventilator for communicating the air/oxygen mixture from said bellows mixing chamber to said drive bellows chamber, means communicating the air/oxygen mixture in said drive bellows chamber to said gas flow control apparatus; a spacing member spaced between said driving and storing chambers and having first and second surfaces each of which is affixed to a fixed end of said mixing and driving bellows, plate members each of which is secured to a respective movable end of each respective said bellows for providing respective inner chambers, and a rigid rod extending through a bore in said spacing member and secured at ends of said rod to facing surfaces of said plate members.