Expiratory valve

Abstract

The present invention discloses an expiratory valve, including a step motor, a valve core, a membrane, a first mandril, a base plate and a first elastic part. The valve core is provided with an air inlet, an air outlet and a valve opening. The first mandril is supported on the base plate by elasticity of the first elastic part. The step motor drives a straight-line motion of the base plate by an actuating mechanism. The membrane is elastic, the edge of which is fixed at the valve core, and the parts of the membrane is placed at a motion curve of the first mandril. The valve opening is placed at the motion curve of the membrane, which makes the membrane adjust an opening angle of the valve opening according to an exhalation status. Because the step motor is adopted as driving force, the responding speed is fast; because an elastic force of the elastic part is used as retention of the membrane which seals the valve opening, the opening angle of the valve opening can be dynamically adjusted; because the expiratory valve can adopt the common actuating mechanism, the cost is low, and the expiratory is easy to be realized.

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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