Method for controlling pressure of anesthesia machine and breathing machine pressure control by using expiration flow sensor

Abstract

The invention discloses a method for controlling pressure of an anesthesia machine and a breathing machine by using an expiration flow sensor. The method comprises the following steps of: (1) monitoring expiration flow by using an expiration flow monitoring sensor which is arranged at the expiration mouth of an expiration valve; (2) establishing a closed-loop proportion integration differentiation (PID) flow control system for the expiration valve and the expiration flow monitoring sensor; (3) grading expiration valve controlled flow PID control parameters according to required focus points in the grading range of 1LPM to 300LPM, and fitting the PID control parameters under flow values at the focus points by a curve fitting method or a broken line approximate method; (4) calculating suction valve controlled output flow and expiration valve controlled output flow under set control pressure according to a formula P=F*R; and (5) performing pressure feedback control on the anesthesia machine and the breathing machine in a suction valve and expiration valve cooperative control mode according to the suction valve controlled output flow and the expiration valve controlled output flow.

Description

technical field [0001] The invention relates to a high-performance and high-precision pressure control ventilation mode for realizing anesthesia machines and ventilators, and belongs to the technical field of medical equipment manufacturing. Background technique [0002] In the control of anesthesia machines and ventilators, pressure-controlled ventilation is required for some special patients. Among the current pressure control methods, one method is to use the inhalation control valve and the exhalation control valve to work together to complete the pressure establishment and pressure balance under the pressure control of the anesthesia machine and the ventilator. This method improves the comfort of the patient. The required pressure can be well controlled. However, this method also has its disadvantages. When the positive end-expiratory pressure is established, the establishment time of the positive end-expiratory pressure is relatively long when the positive end-expirat...

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Problems solved by technology

[0003] In order to solve the problem that the establishment time of the positive end-expiratory pressure is slow and the bias flow is unstable at some limit points when the inspiratory valve and the exhalation valve are used in the control of the anesthesia machine and the ventilator, the present invention proposes a The air flow sensor realizes the pressure control method of anesthesia machine and ventilator to solve the above problems, so as to improve the reliability of the algorithm and further improve the comfort of patients

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