Anesthesia apparatus and calibration method of suction valve thereof

Abstract

The invention discloses an anaesthetic machine, a gas path system comprises an inhalation gas path with an inhalation valve; a flow sensor is arranged in the gas path system and electrically connected with a parameter processing unit for detecting the real-time flow rate of the inhalation gas path; and the parameter processing unit transmits an electrical signal of the flow sensor to a main controller after the processing. The invention further discloses a calibration method of the inhalation valve of the anaesthetic machine, comprising the steps that the main controller controls the opening degree of a valve of the inhalation valve, and the real-time gas flow rate of the corresponding inhalation valve is obtained by the flow sensor, thus obtaining a valve opening table and a valve closing table. The usage of the anaesthetic machine of the technical proposal of the invention only adds one flow sensor, thus having low cost, convenience and practicality. The usage of the calibration method of the inhalation valve of the anaesthetic machine of the technical proposal of the invention can automatically complete the calibration of the inhalation valve after connecting the gas path by a user, thus being convenient and rapid and ensuring the mechanical ventilation of the anaesthetic machine to be more secure and reliable.

Description

technical field [0001] The invention relates to an anesthesia machine in the field of medical devices, in particular to an anesthesia machine capable of calibrating an inhalation valve and a method for calibrating the inhalation valve. Background technique [0002] Pneumatic and electronically controlled anesthesia machines are currently the most widely used anesthesia machines. The control principle is to introduce a stable high-pressure gas source as the power source, and the gas that actually flows into the machine's control gas circuit is regulated by an electronically controlled valve. The main control The device controls the inhalation gas flow rate through the operation of this valve. This valve is generally called an inspiratory valve or an air delivery valve. Its control accuracy directly determines the performance of the anesthesia machine. [0003] The control of the electronically controlled inhalation valve by the anesthesia machine is controlled by adjusting th...

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Problems solved by technology

However, this method is greatly affected by the air path conditions, and it is difficult to rule out the influence of machine air path leakage, compliance and resistance changes, and the airway pressure monitoring error is large, and the accuracy cannot be guaranteed

In addition, this calibration method is also difficult to achieve for low flow rate calibration

[0008] There are also manufacturers who directly use the flow sensor of the patient's breathing circuit to calibrate the inspiratory valve, but the flow sensor of the patient's breathing circuit is easily damaged due to daily use, and factors such as daily maintenance, disinfection or regular replacement of the sensor may cause the patient to The flow sensor used in the loop has been deviated, so calibration cannot guarantee high accuracy

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