LOW DRAG SYRINGE AND CARTRIDGE

摘要

The invention provides a syringe comprising a barrel, a plunger and a plunger rod. The plunger can be deformed by the plunger rod to draw the radial walls of the plunger away from the inner wall of the barrel and thus reduce the friction between the plunger and the barrel, to facilitate injection. The deformation cam also be used to aspirate the syringe. The invention also provides a method of delivering a liquid medium into a patient using such a syringe.