DISPOSABLE PISTON PUMP AND MECHANISM FOR INTRAVENOUS INFUSION Russian patent published in 2015 - IPC A61M5/145 A61M39/22 A61M5/168 

FIELD: medicine.

SUBSTANCE: group of inventions relates to medical equipment. A device for liquid supply contains an input tube, an output tube, an internal cavity, connected with channels of the input and output tubes; the first suction cavity, connected with the internal cavity; and a valve, located in the internal cavity and capable of travelling between the position of filling, the first pumping position and the second pumping position. The valve is configured for liquid connection of a channel in the input tube with a channel in the output tube in the position of the valve filling and liquid connection of the first suction cavity with the channel in the input tube and with the channel in the output tube, when the valve is in the first pumping position and in the second pumping position. The valve contains a small filling tube for liquid connection of the channel in the input tube with the channel in the output tube, when the valve is in the filling position; and a wedge-shaped hole, configured for liquid connection of the channel in the input tube with the first suction cavity, when the valve is in the first pumping position, and liquid connection of the channel in the output tube with the first suction cavity, when the valve is in the second pumping position. Versions of the device for liquid supply, valves, characterised by implementation, and methods of liquid supply are disclosed.

EFFECT: increased accuracy of the liquid flow rate support.

26 cl, 20 dwg