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).
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.
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.
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.