Ventilator operable in a compensated volume support mode
First Claim
1. A ventilator comprising:
- a gas flow generator which produces a flow of gas in a gas flow path in a conduit system adapted for communication with a patient having lungs exhibiting a resistance and an elasticity, said conduit system comprising a plurality of components disposed in said gas flow path having respective mechanical resistances to said flow of gas;
a pressure meter which measures pressure in said conduit system and which produces a pressure measurement signal dependent thereon;
a flow meter which measures gas flow in said conduit system and which produces a flow measurement signal dependent thereon;
a control unit having an input for setting a predetermined tidal volume, and which receives said pressure measurement signal and said flow measurement signal, and which determines a gas pressure, in each breathing cycle of a patient, from said tidal volume, said pressure measurement signal, said flow measurement signal, and a variable representing an aggregate effect of said resistance and elasticity of the lungs, said control unit programmed to regulated said gas flow generator to cause said gas flow generator to generate said gas flow at the gas pressure respectively determined for that breathing cycle.
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Accused Products
Abstract
A ventilator for connection to a patient to provide assisted breathing, has a gas flow generator, a pressure meter, a flow meter and a control unit, which determines a gas pressure, on the basis of a pre-set tidal volume for the patient and measurement signals from the pressure meter and flow meter, for each breath and which regulates the gas flow generator so that it generates the determined gas pressure. An improved breathing mode, better tailored to the patient, is achieved by the control unit also determining the gas pressure to be generated by the gas flow generator on the basis of mechanical resistances and a variable corresponding to the aggregate effect of the resistance and elastance of the lungs.
130 Citations
10 Claims
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1. A ventilator comprising:
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a gas flow generator which produces a flow of gas in a gas flow path in a conduit system adapted for communication with a patient having lungs exhibiting a resistance and an elasticity, said conduit system comprising a plurality of components disposed in said gas flow path having respective mechanical resistances to said flow of gas;
a pressure meter which measures pressure in said conduit system and which produces a pressure measurement signal dependent thereon;
a flow meter which measures gas flow in said conduit system and which produces a flow measurement signal dependent thereon;
a control unit having an input for setting a predetermined tidal volume, and which receives said pressure measurement signal and said flow measurement signal, and which determines a gas pressure, in each breathing cycle of a patient, from said tidal volume, said pressure measurement signal, said flow measurement signal, and a variable representing an aggregate effect of said resistance and elasticity of the lungs, said control unit programmed to regulated said gas flow generator to cause said gas flow generator to generate said gas flow at the gas pressure respectively determined for that breathing cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification