Patent ID: 7104970
Filing Date: 2006-09-12
Classification: A61M

Abstract:
1. An injection syringe with seal structure comprising: a hollow barrel comprising an axial extension at a top end thereof, said axial extension having a positioning spring at a top end and a seal spring at a bottom end thereof; a needle seat positioned inside of the axial extension and including a bulge loop at a bottom end and a needle head seat having a syringe needle at a top end thereof, said needle head seat including a plurality of positioning sheets on an outer surface thereof, said positioning sheets having channels for coupling to the positioning spring; a plunger placed in the hollow barrel including a fastening seat, said fastening seat having a piston, said piston including a hole for inserting a cylindrical column of the fastening seat; a top of said cylindrical column having a plurality of flukes for coupling with the bulge loop; and at least one piercing element formed on an inner wall of said hollow barrel, wherein said at least one piercing element pierces said piston thereby preventing re-use of the injection syringe.