Measuring method of anesthesia apparatus tidal volume

Abstract

The invention discloses a method for measuring the tidal volume of an anaesthetic machine, which can effectively improve the measurement accuracy of medical anaesthetic machine in measuring the tidal volume breathed in or out by patients. The method comprises the following steps: (1) the average value measured by a flow sensor at the prior breathing-out or breathing-in stage is calculated; (2) the flow value of patients at the current breathing-out or breathing-in stage are collected; (3) the flow value of patients at the current breathing-out or breathing-in stage deducts the average value measured by the flow sensor at the prior breathing-out or breathing-in stage and the integration are accumulated in the whole breathing-out or breathing-in stage, thereby obtaining breathing-out or breathing-in tidal volume value; all factors interfering the flow measurement are compensated in real time so as to prevent the measurement results from being affected by the component, the pressure, the temperature, atmospheric pressure and environmental temperature thus achieving the purpose of correctly measuring the breathing-out or breathing-in tidal volume, greatly improving the controllability of anaesthetic effect and realizing the purpose of the method.

Description

technical field [0001] The invention relates to a measurement method, in particular to a method for measuring the tidal volume of an anesthesia machine used for accurate measurement of the tidal volume exhaled by a patient in a medical anesthesia ventilator. Background technique [0002] When a normal adult breathes calmly, the air volume inhaled and exhaled each time is basically equal, and the breath is shaped like a tide, so it is called tidal; The volume is obtained by integrating the gas flow rate of each inhalation or exhalation according to the inhalation or exhalation time. Therefore, to obtain an accurate tidal volume, it is necessary to accurately measure the gas flow rate of each inhalation or exhalation. [0003] The flow measurement methods of existing anesthesia machines generally adopt differential pressure flow measurement, which is based on the Bernoulli equation and the fluid continuity equation. plate, standard nozzle, long-diameter nozzle, classic Ventur...

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Problems solved by technology

[0008] During anesthesia, the patient's exhaled gas is composed of nitrous oxide (N 2 O), oxygen (O 2 ), carbon dioxide (CO 2 ) and other anesthetics, etc., the composition content of each composition is different in different surgical stages, thus involving multiple components and other issues, so temperature and pressure compensation alone is not enough

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