Patent ID: 7896849

Claim:
A syringe comprising: a syringe body having a cylindrical wall extending along a longitudinal axis from one end of the body to another end and having a generally circular section closed at a forward end by a transverse wall in which a circulatory passage for the circulation of fluid is defined, said circulatory passage being extended by a main element for fluidic connection to a complementary volume, and a movable piston inside the syringe body defining, with the cylindrical wall of the syringe body, a chamber for the containment of fluid, wherein the containment chamber opens out through said circulatory passage, wherein the syringe body defines a closed space in which the piston is movably mounted, wherein the piston defines in the closed space, in addition to the fluid containment chamber, an auxiliary return chamber, the cylindrical wall of the syringe body comprising a return passage opening out into said auxiliary return chamber, and wherein said return passage is extended by an auxiliary element for connection to said complementary volume.