Breathing simulator for calibrating spirometer

Abstract

The invention discloses a breathing simulator for calibrating a spirometer. The breathing simulator comprises an axially arranged cylinder body which has a sleeve structure with two axially open ends; a front end cover which is used for covering one open end of the cylinder body and is provided with a gas outlet; a rear end cover which is used for covering the other end of the cylinder body and is provided with gas vents; a piston which is movably arranged inside the cylinder body and the internal space of the cylinder body is divided into a left air chamber and a right air chamber by the piston in the axial direction; a screw which is axially arranged, wherein one end of the screw passes through the rear end cover and is connected with the piston; a stop block which is installed outside the cylinder body and is provided with a screwed hole coaxially with the screw, wherein the screw and the screwed hole are connected in a screw-thread fit mode; and a servo driving mechanism which is used for driving the screw to move axially. The additionally installed gas vents on the rear end cover allow the piston to move back and forth with less force. The screw is adopted for driving the piston to move so that transmission is more accurate and calibration precision is effectively increased. The stop block is connected with the screw in a screw-thread fit mode so that the screw is effectively guided and the screw is prevented from inclining.

Description

technical field [0001] The invention relates to a breathing simulator for calibrating a lung function instrument. Background technique [0002] With the development of computer technology and the deepening of clinical understanding of pulmonary function assessment, pulmonary function testing has become one of the three major clinical diagnoses of lung diseases. Therefore, the application of pulmonary function testing is becoming more and more extensive. When using a pulmonary function tester to test indicators such as forced vital capacity (FVC), vital capacity (VC), maximum minute ventilation (MVV), and resting ventilation (MV), they are easily affected by conditions such as sensors, temperature, and humidity. It will affect the diagnostic results of the patient's lung function. In order to meet the quality control requirements of the lung function tester, it is particularly necessary to perform daily calibration and calibration of the indicators of the lung function teste...

AI Technical Summary

Problems solved by technology

In actual use, it is found that the central axis is easy to deviate during the movement of the piston, and even the piston does not move in place. The movement of the piston is not accurate enough, resulting in unsatisfactory calibration effect and poor accuracy.

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