FIELD: medicine.
SUBSTANCE: piston contains the first element and the second element. The first element consists of the first material and forms the distal end surface of the piston. The second element consists of the second material that has a lower compressibility compared to the first material. The second piston element is located in the cup-shaped receptacle of the first element and provides a force receiving surface from the proximal end of the piston.
EFFECT: improved operation reliability.
10 cl, 3 dwg
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