Ventilation equipment and expiration flow correction method

Abstract

The invention provides ventilation equipment and an expiration flow correction method, and the correction method comprises the steps: in a current respiratory cycle, obtaining a first measurement signal output by a first flow sensor for detecting the expiration flow, and obtaining a second measurement signal output by a second flow sensor for detecting the expiration flow; the drift distance of the second flow sensor is inversely calculated according to the first measurement signal and the second measurement signal; correcting a second corresponding relation between the second measurement signal and the expiratory flow according to the drift distance; in the next respiratory cycle of the current respiratory cycle, the second flow sensor obtains a fourth flow value according to the corrected second corresponding relation and at least displays the fourth flow value; wherein the drift distance generated by the first flow sensor due to environment change is smaller than the drift distance generated by the second flow sensor due to environment change. According to the expiration flow correction method, the detection accuracy of the expiration flow can be effectively improved.

Description

technical field [0001] The invention relates to the field of ventilation, in particular to a ventilation device and a method for correcting an expiratory flow. Background technique [0002] Some high-end ventilators or anesthesia machines use multiple sensors when measuring a patient's inspiratory or expiratory flow due to different usage scenarios. For example, when measuring small flow, a sensor with high measurement accuracy is required, and when measuring large flow, a sensor with a large measuring range is required. Therefore, some products choose to use two or more sensors to measure the flow at the same time, and perform segmental analysis on the measured flow. deal with. [0003] When using two or more sensors, when one or more of the sensors is affected by factors such as ambient temperature, humidity, vibration, or aging of the machine's measurement sampling loop, the zero-point baseline will drift, and the measured flow will be skewed. Correspondingly, the flow ...

AI Technical Summary

Problems solved by technology

This type of scheme can also correct the tidal volume counted by the machine, but the leak volume used for the correction is not a real leak, but the sensor drift is equivalent to a false leak, which may lead to false alarms and untimely leak statistics

In addition, when the patient’s condition changes suddenly, such as aperiodic changes in tidal volume and airway pressure due to man-machine confrontation, the corresponding false leakage will also change suddenly. At this time, it is necessary to recalculate and correct, usually requiring several ventilation cycles, which is more serious The most important thing is that in the invasive ventilation mode, although the machine statistical leakage correction can ensure that the tidal volume statistics tend to be normal, it may also cause the doctor to think that there is a leak hole in the air delivery circuit, and repeatedly adjust the patient's pipeline or gas incision, causing harm to the patient. unnecessary harm

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