Oxygen concentration control device and method of respiratory support device

Abstract

The invention discloses an oxygen concentration control device of a respiratory support device, wherein the oxygen concentration control device includes an air inlet branch, an oxygen inlet branch, agas storage unit and a gas outlet branch. The air inlet branch includes an air inlet gas way, and a first gas inlet, a first flow sensor, a first pressure sensor, a turbine and a first gas outlet successively arranged on the air inlet gas way. The oxygen inlet branch includes an oxygen inlet gas way, and a second gas inlet, a first proportional valve, a second flow sensor, a second pressure sensorand a second outlet successively arranged on the oxygen inlet way. The gas outlet branch includes the gas outlet way, and a third gas inlet, a second proportional valve, a third pressure sensor and athird outlet successively arranged on the gas outlet way. The invention also discloses an oxygen concentration control method of the respiratory support device. Compared with the prior art, the oxygen concentration control device and method of the respiratory support device have higher accuracy.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to an oxygen concentration control device and method for respiratory support equipment. Background technique [0002] Some respiratory support equipment such as ventilators have the function of mixing air and oxygen. The air and oxygen enter the turbine through two air paths. The turbine controls the air intake volume and the proportional valve controls the oxygen intake volume. The respiratory support equipment is based on The oxygen flow value detected by the oxygen flow sensor and the air flow value detected by the air flow sensor calculate the volume of oxygen and air respectively, and then calculate the oxygen concentration, and then compare the calculated oxygen concentration with the target oxygen concentration, so as to adjust the turbine and / or ratio accordingly The valve realizes the control of the oxygen concentration. [0003] However, the oxygen concentration c...

AI Technical Summary

Problems solved by technology

[0003] However, the oxygen concentration control of the existing respiratory support equipment has the following deficiencies: First, the flow rate is always changing during the inhalation process of the user, so that the flow rate of oxygen and the flow rate of air need to be controlled in real time, and the turbine must maintain the flow rate of the output gas. It is difficult to take into account the accuracy of the oxygen concentration while adjusting the air intake volume. Second, when the respiratory support equipment calculates the oxygen concentration, it only considers the relationship between the flow rate and time of air and oxygen, and does not consider the pressure when the flow rate is tested. The relationship between pressure and volume, a certain mass of gas increases with the increase of pressure, the gas volume decreases, if air and oxygen pass through their corresponding flow sensors, the pressure is different, there will be errors in the oxygen concentration calculated according to the flow rate, resulting in oxygen concentration control not allowed

Therefore, the oxygen concentration control of respiratory support equipment in the prior art has the disadvantage of poor oxygen concentration control accuracy.

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