FLUID DISPENSING GUN

• US 3,768,472 A
• Filed: 02/07/1972
• Issued: 10/30/1973
• Est. Priority Date: 02/07/1972
• Status: Expired due to Term

• Current Assignee: Carl Cometta, Dr Milton Hodosh
• Original Assignee: Carl Cometta, Dr Milton Hodosh
• Inventors: Hodosh, Milton, Cometta, Carl
• Primary Examiner(s): Reeves, Robert B.
• Assistant Examiner(s): Rolla, Joseph J.
• Application Number:
  US05/223,873
• Time in Patent Office: 631 Days
• Field of Search: 222/386,387,389,309,334,326,261,262,258 128/173H,218A,218R,218P,DIG.1 92/8,9,10,12 91/422
• US Class Current: 604/143
• CPC Class Codes: A61M 5/20 Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically A61M5/142 , A61M5/46 take precedence; hypodermic projectiles F42B12/54

Abstract

Apparatus for slowly and uniformly injecting fluids, such as liquid anesthesia, into a human or animal body, comprising a gunshaped body having handle and barrel portions, a piston extending axially through the barrel portion, fluid pressure means for selectively extending or retracting the piston, and adjustable damping means associated with the piston to permit controlled movement thereof; whereby when a syringe having a compressible cartridge is operatively connection to the apparatus, extension of the piston causes compression of the cartridge to effect the desired controlled dispensing from the syringe.

Claims

1. Fluid dispensing apparatus comprising an elongated cylindrical housing, means on one end of said housing for mounting a compressible fluid-containing ampule exteriorly of said housing in axial alignment therewith, a piston in said housing and extending outwardly therefrom through said one end, means for moving said piston into engagement with said ampule to compress same and effect dispensing of fluid therefrom, said moving means comprising separate operating and damping chambers through which said piston movably extends, spaced sealing walls on said piston dividing each of the aforesaid chambers into separate compartments, fluid pressure means in communication with said operating chamber for effecting forward and reverse movement of said piston, a passage located inside of said housing and interconnecting said damping compartments for permitting a controlled flow of fluid from one damping compartment to the other during the forward stroke of the piston, thus controlling the rate of movement of the piston during its forward stroke.

2. In the apparatus of claim 1, calibrated means for adjusting the permissible flow of fluid through said passage, whereby the rate of movement of the piston during its forward stroke is correspondingly adjusted, said adjusting means comprising an axially movable portion, movement of which in one direction restricts said passage and in the opposite direction increases the capacity of same.

3. In the apparatus of claim 1, said damping chamber being of larger diameter than said operating chamber.

4. In the apparatus of claim 1, said passage comprising an annular chamber extending around and along the exterior of said damping chamber.