Injection syringe with seal structure

Details Injection syringe with seal structure Injection syringe with seal structure

2006-09-12

2006-09-12

Lucchesi, Nicholas D. (Department: 3763)

Surgery

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

Treating material introduced into or removed from body...

C604S111000, C604S187000

Reexamination Certificate

active

07104970

ABSTRACT:
An injection syringe of the present invention comprises a hollow barrel, a needle seat and a plunger. The top of hollow barrel comprises an axial extension which has an upper channel and a lower channel for forming a positioning spring and a seal spring. The inside of the barrel where it is coupled to the axial extension has at lest one piercer. The needle seat is placed in the hollow barrel, and bottom radius of a body of the needle seat is larger than the top of the body for tightly fastening with the seal spring. The top of needle seat has a needle head seat which includes a plurality of positioning sheets thereon and the needle seat is positioned inside the axial extension by a channel of the needle head seat.

REFERENCES:
patent: 4391273 (1983-07-01), Chiquiar-Arias
patent: 5336198 (1994-08-01), Silver et al.
patent: 6117107 (2000-09-01), Chen
patent: 6413236 (2002-07-01), Van Dyke

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