Flow sensor for pulmonary function testing

Abstract

The invention discloses a flow sensor for pulmonary function testing. The flow sensor comprises a base body, the base body is provided with a through hole capable of achieving air blowing, a high-pressure pressure tap and a low-pressure pressure tap, the high-pressure pressure tap and the low-pressure pressure tap are communicated with the through hole separately, the diameter of the middle of the through hole is smaller than that of the two ends of the through hole, the middle small-diameter segment of the through hole serves as a throat segment, the air blowing segment of the two ends of the through hole serves as an inlet segment, the high-pressure pressure tap is communicated with the inlet segment, and the low-pressure pressure tap is communicated with the throat segment. The flow sensor for pulmonary function testing has the advantages that the suitable changing gradient of a diameter difference is calculated and analyzed through the fixed diameter difference among the different hole segments of the through hole, it is guaranteed that the pressure difference under the laminar condition can be obtained between the high-pressure pressure tap and the low-pressure pressure tap, and therefore the flow sensor achieves the high testing sensitivity, is accurate in tested pressure difference valve and reusable, does not need to be calibrated and is simple in structure and low in usage cost.

Description

technical field [0001] The invention belongs to the technical field of medical equipment, and in particular relates to a differential pressure type throttling respiratory flow sensor for lung function detection. Background technique [0002] With the deterioration of the environment and the increase of smog, there are more and more patients with lung diseases, especially chronic obstructive pulmonary disease (COPD) has become a global public health problem, with a large number of patients and high mortality , The social and economic burden is heavy. The effective detection of human lung function by lung function instrument is an important means of early identification and early diagnosis of chronic obstructive pulmonary disease, so that early intervention therapy can obtain better curative effect. Currently commonly used spirometers include bellows-type portable spirometers, turbine-type portable spirometers, ultrasonic velocity sensing-type portable spirometers, differenti...

AI Technical Summary

Problems solved by technology

The disadvantage of this technology is that the exhaled water vapor is easy to condense and deposit on the sieve mesh to block the mesh. It is difficult to clean and disinfect the mesh, which affects the test accuracy and is easy to cause cross-contamination; The measured results cannot be converted with standard instruments, and calibration is required after cleaning and maintenance.

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