Breathing machine oxygen concentration control method, device and system

Abstract

The invention relates to a breathing machine oxygen concentration control method. The breathing machine oxygen concentration control method comprises steps of obtaining the target oxygen flow velocity of a breathing machine, controlling the opening degree of a proportioning valve to be in a critical valve opening state, obtaining the monitored oxygen flow velocity on the opening degree, calculating a target current value based on the target oxygen flow velocity and the monitored oxygen flow velocity, adjusting the opening degree of the proportioning valve based on the target current value, obtaining the monitored oxygen flow velocity on the adjusted opening degree, determining whether the target oxygen flow velocity is consistent with the monitored oxygen flow velocity or not, calculating a target current value based on the target oxygen flow velocity and the monitored oxygen flow velocity when the target oxygen flow velocity is not consistent with the monitored oxygen flow velocity, otherwise, maintaining the opening degree of the proportioning valve. Under a non-constant pressure, the oxygen concentration can be controlled. In addition, the invention also provides a breathing machine oxygen concentration control device and system, by employing the breathing machine oxygen concentration control system without a pressure-reducing valve, the size and weight of the breathing machine oxygen concentration control device are reduced, and the breathing machine oxygen concentration control device and system are applied to breathing machines which are high in portability.

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 adjustable oxygen concentration according to the patient's condition. For patients being treated, the control of oxygen concentration is very important. The oxygen concentration control system in the ventilator is connected to the oxygen source of the ventilator, and plays the role of controlling the delivery of oxygen with the required oxygen concentration. [0003] The traditional ventilator oxygen concentration control system often uses a pressure reducing valve to provide a constant pressure. Under the condition of constant pressure, the opening of the proportional valve is adjusted according to the corresponding relationship curve between the oxygen flow rate and the opening degree outpu...

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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