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A safety syringe has a barrel, a needle hub movably received in
the barrel and having a hollow cone formed inside the needle hub
and an annular cutout, a stopper having an engaging portion formed
to correspond to the annular cutout and an extension integrally
formed with the engaging portion and being slanted relative to the
engaging portion, and a plunger having a first hook to correspond
to the hollow cone and a second hook to correspond to the extension
of the stopper. Engagement between the second hook and the extension
of the stopper allows the stopper to be taken away from engagement
with the needle hub and engagement between the first hook and the
hollow cone allows the needle hub to be pulled inside the barrel
and thus the syringe is able to be disposed of safely.
A safety syringe cylinder has a structure for attaching a syringe
needle precisely. The syringe needle can be retracted into the syringe
cylinder for bending. A hook seat is formed at a lower end of the
needle. An annular hook groove is formed at a top end of the push
rod cap. The hook seat is engaged with the annular hook groove so
as to control the displacement and bending process of the syringe
needle. Thereby, the processing of undesired syringe needle is safe,
reliable and convenient.
A retractable safety syringe cylinder has a structure which precisely
hooks the syringe needle for retracting the syringe in the syringe
cylinder for bending A hole seat at a lower end of the syringe needle
is matched to a hook body at a top surface of a rod cap of a push
rod. After pushing injection liquid, the two are engaged so as to
control the displacement of the syringe needle. Thus, the waste
from the syringe is controllable and the operation is convenient.
A safety syringe 10 includes a generally tubular body 14 having
a needle end 18 and plunger end 22 needle 38 and retractable needle
seat 30 two-way valve 36 plunger 42 stopper 62 and rear plunger
seal 44. The plunger may be selectively engageable with both the
stopper and the retractable needle seat. During use, the plunger
may be moved to capture the stopper. The user then moves the plunger
and the captured stopper toward the needle end to a displaced position
corresponding to the desired volume of fluid to be withdrawn. A
vacuum is created between the stopper and rear plunger seal, and
helps to draw fluid into the tubular body. At the conclusion of
the patient injection stroke, the plunger engages the needle seat,
and the vacuum between the stopper and rear plunger seal retracts
the needle safely into the tubular body. The two-way valve controls
flow into and out of the body during use.
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