A ventilator and negative pressure expectoration machine

Abstract

The invention relates to an exhalation control method, which calculates the volume of gas in the lung corresponding to the required positive end-expiratory pressure Vp, calculates the total volume Vi in the lungs of a patient in the inhalation stage, and monitors the exhaled gas volume Vo in real time in the expiratory stage; The expiratory valve is closed when the volume of gas remaining in the lungs, Vi–Vo, is less than or equal to Vp. The method further includes: calculating the required positive end-expiratory pressure corresponding to the intra-pulmonary gas volume Vp, calculating the total volume Vi in the patient's lungs during the inspiratory phase, monitoring the exhaled gas volume Vo in real time during the expiratory phase, and if immediately shut down The expiratory valve predicts the exhaled gas volume Vl during the closing process of the expiratory valve; when the remaining gas volume Vi–Vo in the lung is less than or equal to Vp+Vl, the exhalation valve is closed. The expiratory control method provided by the present invention can reduce the expiratory resistance on the premise of maintaining the positive end-expiratory pressure, so as to achieve the purpose of fast and smooth exhalation of the patient.

Description

technical field [0001] The invention belongs to the technical field of medical and health care, and in particular relates to an exhalation control method. Background technique [0002] Controlling or assisting patient ventilation through medical devices is a clinically important treatment. For critically ill patients, controlled / assisted ventilation through medical equipment is often a necessary life-saving treatment measure, such as patients with respiratory failure, patients receiving general anesthesia, etc. [0003] Medical equipment for controlling / assisting patient ventilation includes positive pressure ventilator, negative pressure ventilator, and alternating positive and negative pressure breathing equipment. The modern ventilator was invented at the beginning of the last century and has now become the most important tool in the field of respiratory therapy and critical care. According to statistics, the total number of therapeutic ventilators in China reached 625,...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the exhalation valve will generate a force on the patient's exhalation airflow during the entire exhalation phase, forming a relatively large exhalation resistance, making the patient's exhalation unobstructed.

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