Air-oxygen mixed gas path design and respirator with gas path

Abstract

The invention discloses an air-oxygen mixed gas path design which is provided with an air path, an oxygen path, a mixing path, an air suction port, a patient and an exhalation port, wherein the air path and the oxygen path are respectively provided with an air inlet. Air and oxygen enter the air path and the oxygen path from the air inlet of the air path and the air inlet of the oxygen path, respectively. The air in the air path and the oxygen in the oxygen path form a mixed gas in the mixing path, the mixed gas enters the patient from the air inlet, and the patient discharges the body gas from the exhalation port. The air path has a first proportional solenoid valve, the oxygen path has a second proportional solenoid valve, and the mixing path has a third proportional solenoid valve. According to the air-oxygen mixed gas path design and a respirator with gas path, the ventilator tidal volume and the oxygen concentration can be precisely controlled. When the tidal volume or the oxygenconcentration is set separately, changes in other parameters may not occur.

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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