DEVICE FOR INTRODUCTION OF SPECIFIED DOSE WITH RETURN ACTUATOR MECHANISM Russian patent published in 2014 - IPC A61M5/315 

FIELD: medicine.

SUBSTANCE: invention relates to medical equipment, namely to devices of medication introduction. Device contains case with proximal and distal ends, cartridge for medication with outlet hole, mobile piston, held inside cartridge, actuating element, piston rod and elastic element. Actuating element is connected with possibility of disconnection to rod and moves in proximal direction with respect to case for installation of medication dose and in distal direction for dose introduction. Piston rod brings piston in motion in distal direction with respect to case for dose introduction. Elastic element moves actuating element in proximal direction with respect to case after dose introduction, thus reducing pressure of piston rod on piston. Method of device operation is realised by moving actuating element in proximal direction to install dose, in distal direction to introduce dose, with force acting on actuating element, resulting in travel of piston rod in distal direction and displacement of elastic element. After specified period of time force is removed. Due to mechanical interaction of displaced elastic element and actuating element piston rod travels in proximal direction.

EFFECT: application of invention makes it possible to reduce leak of medication after dose introduction.

15 cl, 3 dwg