A method and device for stabilizing the flow rate of sampling gas in respiratory monitoring

Abstract

The invention relates to the field of respiratory gas monitoring, in particular to a method and device for stabilizing the flow rate of sampling gas in respiratory monitoring. The method and device combine the proportional valve with the air pump control, take advantage of the advantages of no mechanical shock phenomenon and fast response speed of the proportional valve control when the proportional valve opening size is controlled, and greatly overcome the mechanical vibration of the air pump and the corresponding flow fluctuation when the flow rate of the independent air pump is controlled. The adverse effect on subsequent measurement accuracy, especially in the case of small flow or micro flow, the adverse effect of flow fluctuation on gas detection is very obvious, and the function and significance of using the method and device are even more important. On the other hand, the method and device use the proportional valve and the air pump to work in coordination with each other, mainly by controlling the proportional valve to ensure a stable flow rate, ensuring that the flow rate of the sampled gas is within a very stable working range, thereby greatly reducing the impact of the fluctuation of the sampled gas flow rate on subsequent Adverse effects caused by the measurement results to ensure measurement accuracy.

Description

technical field [0001] The invention relates to the field of respiratory gas monitoring, in particular to a method and device for stabilizing the flow rate of sampling gas in respiratory monitoring. Background technique [0002] Respiratory gas monitoring is mainly used to monitor the physiological parameters related to the patient's respiratory vital signs. It can monitor the concentration of carbon dioxide and nitrogen dioxide in the patient's breathing circuit, identify and detect 5 commonly used anesthetic gases (desflurane, sevoflurane, isoflurane, ether, enflurane, halothane). It can detect the patient's breathing condition by detecting the carbon dioxide value in the breath, and can also detect the safe use of anesthesia gas, such as the condition of no excessive, too little or misuse of anesthesia gas, and can also detect the breathing condition of anesthetized patients. At present, there are mainly two types of respiratory monitoring instruments: mainstream and sid...

AI Technical Summary

Problems solved by technology

Gas detection sensors in side-flow respiratory monitoring instruments are precision components, which are easily disturbed by vibration during work and reduce their measurement accuracy. Diaphragm pumps are the main source of vibration in side-flow respiratory monitoring instruments. At present, diaphragm pumps are commonly used The design is to push the diaphragm through the rotation of the motor to complete the pumping or inflating

At the same time, the gas detection sensor is also very sensitive to the fluctuation of the sampling gas flow. The fluctuation of the sampling gas of the gas detection sensor will introduce measurement noise, which seriously affects the measurement accuracy. It is necessary to provide a stable flow of sampling gas

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