Device for measuring residual quantity of lung function based on inspiration sine wave technology of tracer gas

Abstract

The invention provides a device for measuring the lung function residual gas amount based on the inspiration sine wave technology of tracer gas, the device comprises a breathing pipeline system, a gas path system and a measuring system, the gas path system injects the tracer gas into the breathing pipeline system, and the measuring system obtains data from the breathing pipeline system; the measuring system processes part of data and controls the tracer gas injection rate of the gas path system, so that the injection concentration of the tracer gas conforms to a sine wave period; and the measuring system processes the other part of data to obtain a lung function residual gas amount FRC value, and controls the gas path system to perform feedback control and calibration of tracer gas concentration output according to the part of data. According to the invention, an accurate lung function residual gas amount measurement result can be obtained; the integrated machine can be better integrated, and is smaller in size and convenient to carry, connect and use; the device can be matched with different breathing machines, bedside real-time monitoring is achieved, and the staged change trend of the lung function residual gas amount of a subject can be better reflected.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to a pulmonary function detection medical device, and in particular to a device for measuring pulmonary function residual capacity based on a tracer gas inhalation sine wave technology. Background technique [0002] In physiology, functional residual capacity (FRC) refers to the volume of gas remaining in the lungs at the end of a calm exhalation, that is, the lung volume when the inward elastic recoil force of the lung and the outward expansion force of the thorax are balanced. The size of this volume mainly depends on the equilibrium position of these two forces. Clinically, pulmonary FRC has two main functions: (1) the gas storage function, which provides oxygen for the respiratory cycle during apnea (such as during intubation); (2) maintains a certain lung volume at the end of expiration to ensure the opening of the airway. Closure of the end airway will make it difficult to re...

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Problems solved by technology

[0005] However, the technology is not designed to take into account the washing out and / or washing in of the tracer gas. After entering the lungs, some of the tracer gas will be absorbed by the blood in the capillaries of the lungs, and finally return to the lungs through the venous blood. The venous recirculation effect, which will lead to larger errors in the measurement of pulmonary functional residual capacity and affect the accuracy of the measurement results

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