Ventilator oxygen concentration control method, device and system

Abstract

A method for controlling ventilator oxygen concentration, comprising: acquiring the target oxygen flow rate of the ventilator; controlling the degree of opening of proportional valves (120, 510) in a critical state of valve opening, and acquiring the monitored oxygen flow rate under said degree of opening; on the basis of the target oxygen flow rate and the monitored oxygen flow rate, calculating the target electrical current value, and on the basis of the target electrical current value, adjusting the degree of opening of the proportional valves (120, 510), and acquiring the monitored oxygen flow rate under the adjusted degree of opening; determining whether the target oxygen flow rate and the monitored oxygen flow rate are the same, and if the target oxygen flow rate and the monitored oxygen flow rate are not the same, then entering the step of calculating the target electrical current value on the basis of the target oxygen flow rate and the monitored oxygen flow rate; otherwise, maintaining the degree of opening of the proportional valves (120, 510). Oxygen concentration can also be controlled under unsteady pressure. In addition, also provided are apparatuses (140, 530) and a system for controlling ventilator oxygen concentration; a ventilator oxygen control system without pressure reduction valves reduces the volume and mass of ventilator oxygen concentration control, and is suitable for use in a portable high-standard ventilator.

Description

technical field [0001] The invention relates to the technical field of ventilators, in particular to a method, device and system for controlling the oxygen concentration of a ventilator. Background technique [0002] During the use of the ventilator, it is necessary to provide air with an adjustable oxygen concentration according to the patient's condition. Control of oxygen concentration is very important for patients undergoing treatment. The oxygen concentration control system in the ventilator is connected to the oxygen source of the ventilator to control the delivery of oxygen with the required oxygen concentration. [0003] The traditional oxygen concentration control system of ventilator often uses a pressure reducing valve to provide a constant pressure. When the pressure is constant, the opening of the proportional valve is adjusted depending on the corresponding relationship between the oxygen flow rate output by the proportional valve and the opening, so as to ad...

AI Technical Summary

Problems solved by technology

If there is no decompression valve to provide a constant pressure, the oxygen flow rate output by the proportional valve has no corresponding curve relationship with the opening, and the traditional oxygen concentration control method of the ventilator cannot control the oxygen concentration under non-constant pressure

Moreover, the traditional ventilator oxygen concentration control system with a pressure reducing valve is often bulky and heavy, and is not suitable for emergency transport ventilators that require high portability.

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