Flow sensor for pulmonary function test, pulmonary function tester and application

Abstract

The invention provides a flow sensor for pulmonary function test, an application of the flow sensor to a pulmonary function tester and a pulmonary function testing method. The flow sensor is of a hollow tube structure and mainly formed by sequentially connecting an expiratory air inlet portion, a first cone, a throat and a second cone, a low-pressure pressure tap is formed in the tube wall of the throat, and a first high-pressure pressure tap and a second high-pressure pressure tap are formed in tube walls on two sides of the hollow tube structure except for the throat. The flow sensor and the pulmonary function tester can test bidirectional flow of expiration and inspiration and are compact in structure, convenient to calibrate and correct and simple in after-sales maintenance, and miniaturization of the pulmonary function tester is facilitated.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a flow sensor for lung function measurement, a lung function tester, an application and a measurement method thereof. Background technique [0002] The functions of various organs of the human body can only work normally when there is sufficient oxygen supply. The oxygen supply of the human body is obtained entirely by the respiration of the lungs. During the respiration process, the lungs take in oxygen and discharge the metabolite carbon dioxide. Pulmonary function measurement can be used to judge the respiratory function of the tester, and it has practical clinical significance in identifying the type of airway obstruction and evaluating lung function before thoracoabdominal surgery. [0003] With the advancement of technology, the lung function tester has gradually developed from the traditional buoy type and rotary type to an easy-to-carry electronic tester. In this type of ...

AI Technical Summary

Problems solved by technology

However, since the inspiratory flow rate of the human body is much smaller than the exhalation flow rate, two sets of pressure-taking ports are used to detect the expiratory and inspiratory flow rates at the same time, and the sensitivity of inspiratory detection is not enough. The sensor 1008 includes a high-range differential pressure sensor and a low-range differential pressure sensor. The high-range differential pressure sensor is used to detect the expiratory flow, and the low-range differential pressure sensor is used to detect the inspiratory flow to improve the detection sensitivity of the inspiratory flow.

However, due to the use of two sets of differential pressure sensors with different ranges, two sets of calibration systems are required when calibrating the flow sensor, which will not only increase the complexity of the instrument, reduce reliability, but also increase the production process, manufacturing costs and The complexity of after-sales maintenance

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