Anaesthesia machine flow sensor calibration method and device

Abstract

The invention discloses an anaesthesia machine flow sensor calibration method and device. The method includes the steps of connecting a monitoring device with a flow sensor in series, closing an exhalation valve, changing the opening degree of the exhalation valve according to the gradually-increasing / gradually-decreasing rule, conducting filtering on the values of monitored flow and the values of the voltage outputted by the flow sensor, reading and recording the monitored value and the value of the voltage outputted by the flow meter for each opening degree of the exhalation valve, generating voltage-flow data tables and the like, and obtaining a set of voltage-flow data tables by presetting a set of organized flow values through the table look-up or interpolation method, wherein the voltage-flow data tables include the flow meters conforming to the equal difference rule or other rules. In the method and device, filtering is adopted, accuracy of calibration is improved, calibration data are simplified into one-dimensional voltage data to be stored, and actual use of the data is facilitated; in addition, the calibration process is automatically completed through a preset program, and the work efficiency is high.

Description

technical field [0001] The invention relates to the field of anesthesia machines, in particular to a method for calibrating a flow sensor of an anesthesia machine using a one-dimensional linear interpolation algorithm and a device for realizing the method. Background technique [0002] The anesthesia machine is a device that sends anesthetics / agents into the patient's alveoli through a mechanical circuit to form a partial pressure of anesthetic gas. After the anesthetic diffuses in the blood, it directly inhibits the central nervous system, thereby producing an anesthesia effect. The flow sensor is a device that detects the flow signal and converts it into an electrical signal, and is used to detect the flow signal for the anesthesia machine to make a ventilation control plan. [0003] The accuracy of the flow sensor installed on the anesthesia machine is directly related to the accuracy of the detection values ​​of the breathing gas flow rate, tidal volume and ventilation v...

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the defects of cumbersome operation process, low work efficiency, low accuracy rate, large error and difficulty in obtaining a set of voltage-flow data tables with differential or other regular flow values ​​in the above-mentioned method and device, the present invention aims to solve The technical problem is to propose a method and device for calibrating the flow sensor of an anesthesia machine, which has the characteristics of high calibration accuracy, strong practicability, and high degree of automation.

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