1. A piston for a cartridge to be filled medicament, wherein said piston comprises: - a first element (12) of the piston comprising a first material and forming a distal end surface (22) of the piston, - a second element (14) of the piston, comprising a second material having a lower compressibility than the first material, - wherein the second element (14) of the piston located in the cup-shaped receiver (16) of the first element (12) of the piston and provides a surface (25) receiving the force at the proximal end (24) of the piston, wherein in that the electronic circuit (30) is located between the first and second members (12, 14) of the piston, and wherein the distal end surface of the second member (14) of the piston and / or the bottom surface (18) of the first element (12) of the piston comprise a recess receiving said electronic circuit (30) .2. Piston according to Claim. 1, wherein the first and / or second materials comprise polymer material.3. Piston according to any one of the preceding claims, wherein said first material comprises natural and / or synthetic kauchuk.4. Piston according to Claim. 1, wherein said second material comprises cyclic olefin copolymer (COC) .5. Piston according to Claim. 1, wherein the first and / or second elements (12, 14) of the piston has a cylindrical or tubular shape, and wherein the first member (12) laterally covers the second piston member (14) porshnya.6. Piston according to Claim. 1, wherein the second member (14) adjacent to the piston bottom surface (18) of the first element (12) in the axial direction of the piston (1, 2) .7. Piston according to Claim. 1, wherein the surface (25) receiving the force of the second element (14) of the piston is flush with the proximal end surface (27) of the first ale1. Поршень для картриджа, подлежащего наполнению лекарственным средством, причем указанный поршень содержит:- первый элемент (12) поршня, содержащий первый материал и образующий дистальную торцевую поверхность (22) порш
