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An auto-disable safety syringe including a needle, a needle seat,
a plunger, and a barrel. A cover of a needle seat chamber formed
in the needle seat is provided with a splined hole having teeth
and grooves. The needle seat has a ring block and an outer wall
with splined teeth capable of passing through the grooves. A locking
groove is formed in an inner cavity of the ring block and a locking
head is formed on a connecting head to form a locking mechanism.
Spiral grooves on the inner cavity engage with protrusions on the
connecting head. When the locking head and the locking groove are
interlocked and the plunger is retracted, the needle seat and the
needle are retracted inside the barrel together. The syringe protects
both patient and medical staff, is simple in structure, convenient
to use and destructible.
A safety syringe includes a flexible holder-supporting seat that
is sleeved around and that clamps a needle holder within a front
end portion of a syringe barrel. A flexible sealing member seals
an open front end of a plunger so as to define a vacuum chamber
in the plunger. When the plunger moves within the barrel to a front
limit position, a holder-retaining front portion of the sealing
member engages and retains the needle holder thereon, and the plunger
pushes the holder-supporting seat to separate from the needle holder
such that the sealing member and the needle holder move rearward
within the syringe barrel due to negative pressure produced in the
plunger, thereby retracting a needle into the syringe, barrel.
The present invention is a safety syringe for use with a plurality
of interchangeable needles. The plurality of needles may be inserted
by the user into the safety syringe for use. In operations, the
user selects the desired needle, e.g., a needle having a particular
gauge or size or of a particular type. The user inserts the needle
into a safety syringe comprising a barrel, a needle assembly area
located within or attached to the barrel and a plunger. The needle
couples to the syringe by a number of means. For instance, a locking
mechanism may be used by which a needle hub located within the needle
assembly has an area adapted to mate with a corresponding area on
the needle. Or, the needle may be formed as part of a separate needle
assembly, whereby the user will place the entire needle assembly
onto the end of the syringe barrel. During use, the user operates
the syringe, using one hand to depress the plunger, which ultimately
causes a spring to propel the needle into the barrel of the syringe.
A safety syringe has a hollow barrel, a plunger, a connector, a
plug and a needle hub. The plunger has a protrusion extended from
the plunger and along a longitudinal axis of the plunger. The connector
is mounted around the protrusion of the plunger. Multiple limit
stubs and multiple curved limit channels communicating with a corresponding
notch with an inclined side-wall are respectively formed on the
connector and a connecting chamber in a connecting tube of the needle
hub. When the plunger is being pushed towards the needle hub, the
multiple limit stubs respectively pass through the corresponding
curved limit channel and are contained in the corresponding notch.
The inclined side-wall of the notch will stably connect the limit
stub so the plunger can stably retract the needle hub in the hollow
barrel.
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