Disposable syringe with a retractable needle

Details Disposable syringe with a retractable needle Disposable syringe with a retractable needle

A - Human Necessities

61

M

A61M 5/31 (2006.01) A61M 5/32 (2006.01) A61M 5/34 (2006.01)

Patent

CA 2486262

A disposable syringe includes a tubular needle seat inserted into a barrel for fixing a needle cannula. The needle seat has an axially extending cavity with a radially yieldable catch disposed therein. A plunger is movable in the barrel, and has an engaging head defining a rearwardly facing shoulder wall which is retained by the catch when the engaging head is extended into the cavity by a pushing force applied to the plunger. The barrel defines friction diminishing regions such that when the needle seat is moved past the friction diminishing regions to be placed to a disposal position, friction between the needle seat and the barrel is diminished, thereby facilitating a subsequent pulling action of the plunger for retracting the needle cannula into the barrel.

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