Hydro-pneumatic jet injector

Details Hydro-pneumatic jet injector Hydro-pneumatic jet injector

A - Human Necessities

61

M

128/65

A61M 5/30 (2006.01) A61M 5/20 (2006.01)

Patent

CA 1157332

ABSTRACT OF THE DISCLOSURE A pneumatic jet injector for needleless injection of a liquid medicine into the skin includes a pistol-shaped casing in- cluding a barrel, a handle and a trigger; a compression chamber in one end of the casing for a gas which is partially liquefied under pressure; a first piston movable in the casing against the gas; a charging liquid in the handle which is pumped against the first piston using the trigger and a second piston in the handle; a pis- ton rod movable in the barrel with the first piston for creating a partial vacuum in the barrel for drawing medicine into the barrel through an inlet containing a one-way valve; a discharge orifice in one end of the barrel for discharging medicine into the skin of a user; and a safety catch in the handle for locking the first and second pistons in the loaded or charged position, and for releasing the pistons whereby at least a portion of the liquid in the com- pression chamber becomes gaseous moving the piston rod against the medicine to discharge the medicine through the orifice into the skin, while the charging liquid returns to the handle.

381271

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