Air-oxygen mixed gas path design and ventilator with the gas path

Abstract

The invention discloses a design of an air-oxygen mixed gas path, which has an air path, an oxygen path, a mixing path, an inhalation port, a patient, and an exhalation port. The air inlet of the air path and the air inlet of the oxygen path enter the air path and the oxygen path, and the air in the air path and the oxygen in the oxygen path form a mixed gas in the mixing path, and the mixed gas enters from the suction port In the patient's body, the patient discharges gas from the exhalation port, the air circuit has a first proportional solenoid valve, the oxygen circuit has a second proportional solenoid valve, and the mixing circuit has a third proportional solenoid valve, The air-oxygen mixed air circuit design and the ventilator with this air circuit can precisely control the tidal volume and oxygen concentration of the ventilator, and no matter whether the tidal volume or oxygen concentration is set separately, it will not cause changes in other parameters.

Description

【Technical field】 [0001] The invention relates to medical equipment, in particular to a design of an air-oxygen mixed gas circuit and a ventilator with the gas circuit. 【Background technique】 [0002] At present, there are three types of ventilator gas circuits in the market, regardless of high-end or low-end. The first type uses the form of a valve island to mix air and oxygen. This mixing method uses a large number of solenoid valves and requires a larger air bag. , Since the opening diameter of the solenoid valve cannot be changed, if you want to mix the oxygen concentration of 21%-100%, you must choose a combination of solenoid valves with different calibers to achieve air-oxygen mixing, so that the mixed oxygen concentration has a large error and low accuracy. , due to the need for a larger air bag, it takes a long time to reach the oxygen concentration set by the operator. The second uses two proportional solenoid valves to mix air and oxygen. One proportional valve c...

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Problems solved by technology

[0002] At present, there are three types of ventilator gas circuits in the market, regardless of high-end or low-end. The first type uses the form of a valve island to mix air and oxygen. This mixing method uses a large number of solenoid valves and requires a larger air bag. , Since the opening diameter of the solenoid valve cannot be changed, if you want to mix the oxygen concentration of 21%-100%, you must choose a combination of solenoid valves with many different diameters to achieve air-oxygen mixing, so that the mixed oxygen concentration has a large error and low accuracy. , due to the need for a larger air bag, it takes a long time to reach the oxygen concentration set by the operator

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