Self-contained power-assisted syringe

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.