PNEUMATIC FLOW GENERATOR FOR LUNG VENTILATOR Russian patent published in 2021 - IPC A61M16/00 A61H31/02 

FIELD: medical engineering.

SUBSTANCE: invention relates to medical engineering, namely a pneumatic flow generator for a lung ventilator. Pneumatic flow generator for a lung ventilator comprises a control unit, the breathing mixture flow rate sensor and two pneumatic channels: an air channel and an oxygen channel, each of which contains the following units, interconnected in sequence: a gas pressure reducer, a gas flow rate sensor having a control output, and an adjustable valve having a control input. The output of each of the adjustable valves is connected to the output channel of the generator connected to the input of the respiratory mixture flow sensor equipped with a control output and intended for supplying the breathing mixture to the patient. The output of each of the adjustable valves is connected to the output channel of the generator hooked up to the input of the breathing mixture flow rate sensor equipped with a control output and intended for supplying the breathing mixture to the patient. The control unit contains three inputs, one of which is connected to the control output of the breathing gas flow rate sensor, and each of the other two is attached to the control output of one of the gas flow rate sensors, and two outputs, each of which is connected to the control input of one of the adjustable valves. An extra channel is additionally included in the generator, containing the following units, interconnected in sequence: a pneumatic switch with a control input, a gas flow rate sensor of the additional channel with a control output, and an adjustable valve of the additional channel with a control input. The input of the gas flow rate sensor of the additional channel is connected to the output of the pneumatic switch, each of the two inputs of which is hooked up to the output of one of the gas pressure reducers, and the output of the adjustable valve of the additional channel is connected to the output channel of the generator. The control unit is supplemented with two outputs, one of which is connected to the control input of the pneumatic switch, and the other one is linked to the control input of the adjustable valve of the additional channel, and one input connected to the control output of the gas flow rate sensor of the additional channel.

EFFECT: increased accuracy of adjusting the breathing mixture composition within the entire range of gas flow rates, as well as increased reliability of the device and expansion of its operational capabilities.

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