초록 ▼

A pressure support ventilatory assist device is disclosed. Pressure is provided by a blower which is operated at the minimum speed necessary to achieve the desired inspiration pressure. Pressure regulation is achieved by means of a novel pressure regulator valve, rather than by modulating blower spe

A pressure support ventilatory assist device is disclosed. Pressure is provided by a blower which is operated at the minimum speed necessary to achieve the desired inspiration pressure. Pressure regulation is achieved by means of a novel pressure regulator valve, rather than by modulating blower speed, thereby reducing perceptible noise. The flow sensor is removed from its conventional location between the regulator valve and the patient mask to a location upstream of the regulator valve to minimize resistance to patient expiration and to isolate the valve from possible fluids in the tubing. Since the flow sensor in this location cannot sense expiration flows, the device includes circuitry for generating a model of the expiratory waveform based upon the inspiratory waveform. Actual pressure is then modulated to conform to the model waveform.

대표청구항 ▼

[ What is claimed is:] [1.] A device for providing pressurized breathable fluid to a patient comprising:a blower for blowing a fluid;a conduit for placing said blower in fluid communication with said patient;a valve disposed between said blower and said patient for varying a pressure of said fluid w

[ What is claimed is:] [1.] A device for providing pressurized breathable fluid to a patient comprising:a blower for blowing a fluid;a conduit for placing said blower in fluid communication with said patient;a valve disposed between said blower and said patient for varying a pressure of said fluid within said conduit, said valve including a valve housing defining a valve interior, said valve housing carrying at least one inlet port communicating said fluid from said blower to said valve interior;a piston slidably carried within said valve housing, said piston including a piston inlet port, said piston having a first position wherein said piston inlet port communicates with said housing inlet port enabling fluid from said blower to enter into said conduit, and said piston having a second position wherein said piston inlet port is offset from said housing inlet port preventing fluid from entering said conduit; anda force generator for moving said valve from said first position to said second position for controlling a pressure of said fluid within said conduit.