Automatic injector

Details Automatic injector Automatic injector

1993-03-24

1996-10-29

Green, Randall L.

Surgery

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

Treating material introduced into or removed from body...

604 87, 604 89, 604135, A61M 3700

Patent

active

055691927

ABSTRACT:
An automatic injector for the separate storage of a solid and a solvent for this solid. The injector comprises a discharge mechanism, a cartridge assembly and a front cover which is connected to a front portion of the cartridge assembly and provided at its front with a pierceable central area. The cartridge assembly comprises a hollow barrel, a pierceable stopper connected to the front portion of the barrel and constituting a compartment in front of said stopper for accommodating the solid, a piston slidably accommodated in the backward portion of the barrel and constituting a compartment for liquid in the barrel, an injection needle longitudinally extending in the liquid compartment, and means for centering the distal end of the needle in order to position the needle tip towards the pierceable stopper. The front cover is capable of rotational movement relative to the outer sleeve to allow the liquid in the barrel to reach the solid compartment through the needle. The injection needle is accommodated in the barrel in an unfixed manner to allow relative longitudinal movement between the injection needle and the barrel.

REFERENCES:
patent: 2228537 (1941-01-01), Smith
patent: 4755169 (1988-07-01), Sarnoff et al.
patent: 4820286 (1989-04-01), van der Wal
patent: 4822340 (1989-04-01), Kamstra
patent: 4968302 (1990-11-01), Schluter et al.
patent: 4983164 (1991-01-01), Hook et al.
patent: 5041088 (1991-08-01), Ritson et al.

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