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The safety syringe has a hollow barrel, a needle hub, a sleeve
and a plunger. The needle hub is mounted on the hollow barrel and
has a needle, a hub and a stopper. The needle is mounted on the
hub and the stopper is mounted inside the hub. The hub has channels
through which medication or blood can pass. The sleeve is mounted
on the needle hub. The plunger is mounted slidably inside the hollow
barrel. The used needle is retracted into the tube after use by
a vacuum after seating the stopper and retracting the plunger to
keep people from getting injured or infected.
A safety syringe includes a barrel and a plunger is axially and
movably inserted in the barrel. The plunger has a stopper connected
to a first end thereof which is inserted in the barrel and a through
hole is defined through the first end of the plunger. A push rod
is axially and movably inserted into the plunger and an engaging
member is connected to a first end of the push rod. A second end
of the push rod is received in a second end of the plunger. A needle
cannula is removably engaged with a first end of the barrel and
has an engaging hole defined in an end thereof. The engaging member
extends through the through hole and is engaged with the engaging
hole of the needle cannula after injection by pushing the push rod
toward the needle cannula. The needle cannular is then pulled backward
and received in the barrel by pulling the plunger.
The present invention is an improved needle holder for safety syringe,
which is a needle holder formed through compounding two materials
in one-time, in which rubber convex ring of high coefficient of
deformation is formed on the step ring of holder, such that the
convex ring can properly compress the ring slot at the front part
of barrel. Further, a buckle ring is formed inside the holder, such
that the buckle head of plunger locks the buckle slot after injection,
and the holder as well as the needle are pulled back into the barrel
when the plunger is pulled, thus prevents the needle from exposure.
A retractable safety syringe includes a syringe barrel, a needle
mount, a plunger rod and a needle. The needle mount includes a hollow
truncated cone extending inward and upward with a completely surrounded
lower conical portion. The hollow truncated cone includes a slit
cutting from a ridge of the truncated cone. The plunger rod includes
a rod and a plunger formed at one end of the rod. The plunger has
a plunger crown and a detent connected to the plunger crown. The
hollow truncated cone containing a slit allows the plunger rod's
detent to latch on to the needle mount making the plunger rod and
needle mount components become jointly retractable. Using the hollow
truncated cone design augments the robustness factor of the needle
retraction mechanism, using the slit increases its ease of use,
while both hollow truncated cone and slit jointly minimize fluid
loss.
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