Needleless jet injector

Details Needleless jet injector Needleless jet injector

1983-04-14

1986-11-18

Pellegrino, Stephen C.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604135, A61M 1100

Patent

active

046233326

ABSTRACT:
A needleless hypodermic injector includes an elongated cylindrical casing defined by front and rear telescoping sections, with an injection orifice at the closed front end of the front section and a push button trigger at the rear end of the rear section. A piston slidably mounted in a cylinder in the front section of the casing moves rearwardly to define a medicine chamber for receiving medicine from a bottle directly or through a valve incorporated in the front end of the front casing section. The piston is moved rearwardly by an internally threaded collar on the externally threaded cylinder, the collar pressing against a bushing, which presses against disc springs in the rear section of the casing. A latch mechanism retains the bushing against the springs until the trigger is pressed, at which time the springs drive the piston forward to discharge the medicine from the chamber through the injection orifice.

REFERENCES:
patent: 2704543 (1955-03-01), Scherer
patent: 3490451 (1970-01-01), Yahner
patent: 3507276 (1970-04-01), Burgess
patent: 3908651 (1975-09-01), Fudge
patent: 4165800 (1979-08-01), Doherty
patent: 4447225 (1984-05-01), Taff et al.
patent: 4518385 (1985-05-01), Lindmayer et al.

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