Patent ID: 8708958

Claim:
A portable, self-contained and hand-held power assisted syringe suitable for the injection of viscose liquids or gases into small bore diagnostic catheters and small guiding catheter systems, said power assisted syringe comprising: a barrel assembly having proximal and distal ends and an internal spatial volume for containing and delivery of a fluid material; a nozzle connected to said distal end of said barrel assembly for ejecting fluid material contained within said internal spatial volume of said barrel assembly; a hand operable plunger assembly comprising a plunger member and a plunger plate slidably disposed within said barrel assembly for ejecting fluid material contained within said internal spatial volume of said barrel assembly through said nozzle; a manually controlled valve housing assembly which receives and allows pressurized gas flow to occur on-demand into said internal spatial volume of said barrel assembly, said manually controlled valve housing assembly (i) comprising a source valve and a vent valve which can be opened and closed repeatedly at will and that adjusts the cross-sectional area for gas flow in a continuously variable manner, (ii) being in direct fluid flow communication with said internal spatial volume of said barrel assembly, (iii) being able to receive pressurized gas directly on-demand from a portable source as an unregulated gas flow, and (iv) being able to control and deliver said received pressurized gas at variable flow rates on-demand directly and exclusively to said internal spatial volume of said barrel assembly; manual operating means by which to apply a hand-generated force to said plunger assembly; and means for attaching a portable source of pressurized gas to said valve housing assembly, such that a portable source of pressurized gas can be attached and thereby provide pressurized gas to said valve housing assembly at a pressure sufficient for the injection of viscose liquids or gases into small bore diagnostic catheters and small guiding catheter systems.