Blood extraction reservoir consists of piston arrangement with piston stopper made of flexible material, two extensions which press together to seal the material and prevent vibrations in it when blood flows through

摘要

Reservoir has a piston/cylinder arrangement (2,11) with a conical tip and a piston stopper(3) made of flexible material fixed to the head (12) of the piston rod (11). The head has a centrally positioned extension (13) and a second extension (17) on the back (16) of the stopper. A bar (26) locks the rod into its end position, in which the first extension presses against the first extension. This compression seals the material of the piston stopper around the opening of the cylinder preventing the liquid flowing through causing vibrations in the material of the piston stopper.