1. A medical device for introducing a liquid medicament provided with a cartridge (10) containing liquid to be administered medication, wherein the cartridge (10) having a distal end (11) and a proximal end (13) connected to an inner wall forming a space (14 ) with a variable volume containing the liquid medicament, a distal end (11) of the cartridge is blocked membrane (12), a proximal end (13) is blocked by a movable piston (15) having a front wall (16) and a rear wall (17), the piston ( 15) is mounted for displacement toward the distal end (11) of the cartridge (10) through a rod (20) of the piston and to reduce thereby the variable volume space (14) between the membrane (12) and the piston (15) and the base (1 ) of the piston rod located between the plunger (20) of the piston and the piston (15) has a central portion (2) abutting a shaft (20) of the piston and an outer portion (3), the central part (2) and the outer part (3 ) are associated with one another with rassoedineniya.2. Device according to Claim. 1, wherein the central portion (2) and the outer part (3) are associated with each other without the possibility of re-coupling after rassoedineniya.3. The device according to claim. 1, wherein the central part (2) and the outer part (3) arranged to disconnect when applied to the outer part (3) force exceeding a certain threshold predel.4. Device according to Claim. 1, in which the outer part (3) of the base (1) of the piston rod is mounted for axial displacement in the proximal direction relative to the central part (2) .5. Device according to Claim. 1, wherein the central portion (2) and the outer part (3) of the base (1) piston rod are of different okrasku.6. Device according to any one pr1. Медицинский прибор для введения жидкого лекарственного препарата, снабженный картриджем (10), содержащим подлежащий введению жидкий лекарственный препарат, при этом картридж (10) имеет дистальный конец (11) и проксимальный конец (13), соединенные внутренней стенкой, фор
