Expiratory valve

Abstract

The invention discloses an exhalation valve, which includes a stepping motor, a valve core, a diaphragm, a first push rod, a base and a first elastic member. The valve core has an air inlet, an air outlet and a valve port. The first ejector rod is elastically supported on a base through the first elastic member, and the stepper motor drives the base to move linearly with the first ejector rod through the transmission mechanism. The diaphragm is elastic, and its edge is fixed on the valve core , the middle of which is located on the motion track of the first push rod, and the valve port is located on the motion track of the diaphragm, so that the diaphragm can dynamically adjust the opening of the valve port according to the exhalation condition. Since the stepper motor is used as the driving force, the response speed is fast; since the diaphragm sealing the valve port uses the elastic force of the elastic part as the holding force, the opening of the valve port can be dynamically adjusted; since the exhalation valve can be used The transmission structure, so the cost is low, and the realization is relatively easy.

Description

technical field [0001] The invention relates to the field of exhalation valves, in particular to an electronically controlled exhalation valve. Background technique [0002] The exhalation valve device is an important part of the ventilator. Its main function is to cooperate with the ventilator for breathing action. It is specifically divided into: (1) closed when inhaling, so that all the gas provided by the ventilator can be supplied to the patient. At the end of inspiration, the exhalation valve can still continue to be closed, so that it can hold its breath; (2) it is only opened during exhalation, so that it can be exhaled. When the airway pressure is lower than PEEP (positive end-expiratory pressure, positive end-expiratory pressure), the expiratory part must be closed to maintain PEEP. When the airway pressure is higher than PEEP, the exhalation valve is partially opened until the pressure drops to PEEP value; (3) When the system is powered off, the exhalation valve ...

AI Technical Summary

Problems solved by technology

[0007] 1) The response speed of the air-controlled exhalation valve is slow. When the pressure in the airway suddenly rises, the exhalation valve cannot be opened quickly to reduce the pressure, which will cause the patient's breathing discomfort and cannot support some intelligent ventilation modes.

[0008] 2) The electronically controlled exhalation valve with proportional electromagnet or voice coil motor as the driving force is relatively expensive; while the electronically controlled exhalation valve with stepping motor as the driving force has no diaphragm structure and corresponding holding force. During the whole process of the patient's exhalation, the opening of the valve port is the same, and the speed of the exhaled gas cannot be dynamically adjusted.

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