Patent ID: 6458101
Filing Date: 2002-10-01
Classification: A61M

Abstract:
A hypodermic syringe having a hypodermic needle attached thereto, said hypodermic syringe comprising:a barrel having a cylinder body which is provided with a receiving hole, and at least one catching piece disposed at the front end of said barrel and provided in the inner edge with a retaining tooth; a rotatable outer sleeve having an annular body which is provided axially with a fitting hole for fitting with said cylinder body of said barrel, and at least one escape hole disposed at the front segment of said annular body, said outer sleeve being rotatable in relation to said barrel to locate at various positions; a needle holder having a cylinder cooperating portion capable of sliding in said receiving hole of said barrel, a retaining circular groove disposed in the outer periphery thereof, and a liquid transporting hole extending axially; a plunger having a rod body provided at a predetermined position with a severing portion, and a hooked retainer disposed at the front end; a stopper fitted at the front end of said plunger and disposed in said receiving hole of said barrel; said outer sleeve being rotatable in relation to a barrel first position so as to enable said retaining tooth of said barrel to catch said retaining circular groove of said needle holder, or rotating said outer sleeve to a second position to enable said escape hole thereof to be corresponding to said catching piece of said barrel to eject outward, thereby enabling said needle holder to displace to allow said plunger to pull back the needle.