GAS PUMPING MEDICAL INJECTION DEVICE Russian patent published in 2025 - IPC A61M5/145 

FIELD: medicine.

SUBSTANCE: group of inventions relates to medical equipment, namely to an injection device, an injection system and a method of operating the injection device. Injection device for introduction into a medical tube of a medical fluid from a medical fluid container comprises a body, a piston, a pumping channel, a selector and a purge valve. Injection system comprises the above injection device, a first connector, a medical fluid supply line and a common line. Disclosed is a method of operating said injection device, in which the injection device is retained with the upper end of the housing directed upwards, and a lower end of the housing directed downwards, wherein the method includes a filling step, at which the piston moves in the inner space along the longitudinal direction towards the upper end of the housing, causing the medical fluid from the medical fluid container and gas to penetrate into the inner space through the medical tube interface, wherein the blowdown valve is in a blocking configuration, a blowdown step at which the piston moves in the inner space along the longitudinal direction to the lower end of the housing, and on which gas is pumped from the lower space into the upper space of the inner space through a pumping channel passing through the piston, while the selector retains the medical fluid in the lower space, wherein the blowdown valve is in a passage configuration.

EFFECT: use of the group of inventions enables to pump gas from the injection device whenever the piston moves to eject the medical fluid into the medical tube.

14 cl, 11 dwg