Medical ventilator
First Claim
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1. A medical ventilator for providing anesthesia to a patient, comprising:
- (a) a first inspiratory conduit;
(b) inspiratory flow-control means for controlling an inspiratory flow of gas within said first inspiratory conduit;
(c) a second inspiratory conduit, in communication with said first inspiratory conduit, such that said inspiratory flow travels from said first inspiratory conduit into said second inspiratory conduit;
(d) a bellows assembly, in communication with said second inspiratory conduit, such that said inspiratory flow travels from said second inspiratory conduit into said bellows assembly;
(e) an expiratory conduit, in communication with said bellows assembly, such that an expiratory flow of gas travels from said bellows assembly into said expiratory conduit;
(f) means for preventing said expiratory flow from traveling into said first inspiratory conduit; and
(g) pressure-control means for causing the pressure of gas comprising said expiratory flow to vary concomitantly with variations in the pressure of the gas within said first inspiratory conduit.
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Abstract
A medical ventilator is provided which continuously controls both inspiratory and expiratory flow and pressure, including positive end expiratory pressure (PEEP), through control of a single inspiratory flow-control valve. This valve controls inspiratory flow and pressure and, during expiration, controls expiratory flow and pressure by controlling the pressure within the back chamber of an expiratory diaphragm or balloon-type valve. Feedback signals preferably are provided to the valve'"'"'s controller to provide inspiratory closed-loop flow control and continuous inspiratory and expiratory closed-loop pressure control.
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Citations
7 Claims
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1. A medical ventilator for providing anesthesia to a patient, comprising:
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(a) a first inspiratory conduit; (b) inspiratory flow-control means for controlling an inspiratory flow of gas within said first inspiratory conduit; (c) a second inspiratory conduit, in communication with said first inspiratory conduit, such that said inspiratory flow travels from said first inspiratory conduit into said second inspiratory conduit; (d) a bellows assembly, in communication with said second inspiratory conduit, such that said inspiratory flow travels from said second inspiratory conduit into said bellows assembly; (e) an expiratory conduit, in communication with said bellows assembly, such that an expiratory flow of gas travels from said bellows assembly into said expiratory conduit; (f) means for preventing said expiratory flow from traveling into said first inspiratory conduit; and (g) pressure-control means for causing the pressure of gas comprising said expiratory flow to vary concomitantly with variations in the pressure of the gas within said first inspiratory conduit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification