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Disposable syringe with retractile needl

Disposable syringe (100) characterized in that it is provided a needle carrier socket element (4), coupable with a lip of a reservoir (1) from inside the same reservoir, in that a seal (46) is realized on said lip for seating a sealing gasket (7) between needle carrier socket (4) and reservoir lip, in that it is provided a double hook element (9), causing, after the piston stroke toward the end of said socket element (4) of the needle (5), to allow its retraction within the reservoir (1) during the reverse stroke of the piston (2) and in that an elastic element or spring (8) is provided between said double hook element (9) and the end of said reservoir lip, that, when compressed, maintains said double hook element (9) in its position, and when extended acts to cause the return of the needle (5) within the reservoir (1).

Disposable syringe

A disposable syringe, which is enhanced for a safer use, is disclosed. The disposable syringe includes a cylinder having both ends open, an adapter tube inserted in one side of the cylinder, an insertion tube inserted in the adapter tube, and allowing the adapter tube to be in airtight contact with an inner circumference of the cylinder, and a piston inserted in the cylinder.

Disposable syringe with a retractable needle

A disposable syringe includes a barrel having a retaining region to retain a needle seat for carrying a needle cannula, and a friction diminishing region extending forwardly from the retaining region and terminating at a shoulder abutment, a plunger movable in the barrel toward the needle seat, and a coupling member biased by a biasing member and having a retained portion to frictionally engage the plunger, and an anchored portion to engage an anchoring portion of the needle seat such that when the needle seat is moved past the friction diminishing region to abut against the shoulder abutment, a subsequent pushing force applied to the plunger results in release of the retained portion from the plunger, thereby enabling the anchored portion to be moved into the plunger by means of the biasing member.

Disposable syringe with a retractable needle

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.


Disposable syringe with a retractable needle
Disposable syringe device auxiliary unit for preventing iatrogenic infection through needle


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