Air and oxygen mixing device and method for respirator

Abstract

The invention discloses an air and oxygen mixing device and method for a respirator. The air and oxygen mixing device for the respirator comprises a choke. An air inlet and a nozzle assembly are arranged at one end of the choke. An air outlet is formed in the other end of the choke. The nozzle assembly comprises a large nozzle embedded into the choke, a small nozzle is arranged in the large nozzle, a small spray hole is formed in the small nozzle, an annular large spray hole is formed between the outer wall of the small nozzle and the inner wall of the end face of the large nozzle, and the small nozzle can move in the large nozzle in the axial direction of the small nozzle so as to adjust the size of the large spray hole. According to the air and oxygen mixing device and method, the size of the large spray hole can be adjusted by moving the small nozzle, different spray hole diameters are selected under different output flows, high adsorption capacity and back pressure resistance are achieved, compared with the prior art, low oxygen concentration can be achieved under the same output flow and back pressure, and the oxygen concentration under the same back pressure and different flows is small in fluctuation amplitude and high in stability compared with that in the prior art.

Description

Technical field [0001] The invention relates to the technical field of ventilator, in particular to an air-oxygen mixing device and method for ventilator. Background technique [0002] The ventilator is a vital medical device that can prevent and treat respiratory failure, reduce complications, and save and prolong the life of the patient. The oxygen concentration of the gas inhaled by the patient has a direct impact on the treatment effect. The portable first-aid and transport ventilator with air-oxygen mixing function in the prior art basically uses the principle of Venturi effect to achieve the purpose of inhaling air, but this type of ventilator has low resolution of adjustable oxygen concentration in air-oxygen mixing. , There are only two adjustments of pure oxygen and empty oxygen, and the lowest oxygen concentration that can be achieved by empty oxygen mixing is relatively high, only 50% oxygen concentration can be achieved, and no lower problem can be achieved. Summary ...

AI Technical Summary

Problems solved by technology

The portable first aid and transfer ventilator with air-oxygen mixing function in the prior art basically uses the principle of the Venturi effect to achieve the purpose of inhaling air, but this type of ventilator has low oxygen concentration adjustable resolution in terms of air-oxygen mixing. , only two levels of pure oxygen and air oxygen can be adjusted, and the minimum oxygen concentration that can be achieved by air-oxygen mixing is relatively high, only 50% of the oxygen concentration can be achieved, and the lower problem cannot be achieved.

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