Safety syringe abstract
An automatically retractable safety syringe includes a needle assembly
consisting of a cannula, a needle hub and a rubber O-ring, a needle
cap, a retracting spring, a breakable and retractable plunger, a
plunger gasket and a medicine barrel; in accordance with the structure
of the said automatically retractable safety syringe of the present
invention, since the breakable plunger is assembled inside the medicine
barrel, after being pushed all the way to the end, it is forced
to break automatically into two parts for reducing it's length so
as to provide enough space for the retracting spring to drive the
needle assembly moving along the sliding passages for accomplishing
an automatically retracting action.
Safety syringe claims
What is claimed is:
1. An automatically retractable safety syringe to be adopted for
injecting medicine comprising: a needle cannula, and a rotary and
movable needle hub; an expandable retracting spring receiving a
needle assembly in an interior space for storing kinetic energy;
a breakable retracting plunger configured for breaking into a retracting
rod and a hollow receiving tube; a plunger rubber gasket; a needle
hub rubber gasket; a needle cap covering and guarding the needle
assembly and clipping onto a retaining hook of a medicine barrel,
such that, when the needle cap is not separated from the retaining
hook of the medicine barrel, the retaining hook is not able to eject
and the needle assembly cannot retract; an interior of the medicine
barrel has a space for the needle assembly, the retracting spring,
the breakable retracting plunger and the plunger rubber gasket;
whereby, when the retracting spring area is over a halfway retracting
state, the breakable retracting plunger drives the needle assembly
and compresses the retracting spring; after the breakable retracting
plunger breaks into two-parts the retracting rod and the hollow
receiving tube, the retracting spring expands to move the needle
assembly into the interior of the medicine barrel and the retracting
rod into an interior of the hollow receiving tube for accomplishing
the automatically retracting action.
2. The automatically retracting safety syringe according to claim
1 wherein one end of the needle hub receives the needle cannula
fitly penetrating the center thereof for flowing the medicine; the
circumference of the other end is disposed with an annular rubber
gasket groove; a convex torus is disposed as a check plate at one
end of a retracting spring; a plurality of concave positioning slits
are disposed at two ends of the needle hub to connect a plurality
of proceeding slopes tapered upwards, a plurality of rotating slide
passages concaved inwardly and slanted for rotation as well as to
connect a plurality of communicating slide passages concaved inwardly
to form at least more than two U-shaped slide passages for the needle
assembly to make retracting action.
3. An The automatically retracting safety syringe according to
claim 1 wherein the retracting rod of the breakable retracting
plunger has a rubber clip head on a first end to clip with the plunger
rubber gasket, a second end of the retracting rod is connected to
a first end of the hollow receiving tube with a breakable cutting
edge area formed therebetween; a second end of the hollow receiving
rod is disposed with a push grip; an annular bottom check ring is
located on an outer periphery of the hollow receiving tube controlling
the bottom position of the syringe; an annular fastening annular
groove controls and fastens the breakable retracting plunger to
break into two parts and rotates the needle assembly for completing
inwardly retraction.
4. The automatically retracting safety syringe according to claim
1 wherein a first end of the cylindrical medicine barrel is disposed
with a plurality of resilient retaining hooks pointing internally
for engaging the needle hub; a second end is disposed with a handle
lug; an aperture of the first end of cylindrical medicine barrel
is smaller than an interior thereof to form a check ring for retaining
the retracting spring; the second end of the cylindrical medicine
barrel is disposed with an annular convex ring for controlling and
positioning the bottom check ring and the fastening annular groove.
Safety syringe description
BACKGROUND OF THE INVENTION
1) Field of the Invention
The present invention relates to an automatically retractable safety
syringe, more particularly to a syringe designed to be operated
by single hand and to have an automatically retractable needle assembly
not allowing for reuse.
2) Description of the Prior Art
Nowadays, since syringes have been widely used to inject medicine
all around the world, needle sticking related injuries occur quite
often; the sequelae caused by this kind of accident should not be
overlooked because more than twenty kinds of diseases are infected
through blood transmission, for example, HIV-1 (AIDS), Hepatitis
B and C; it requires a considerable society cost for handling the
follow-ups after injury accidents. The prior art safety syringe
is usually operated manually by both hands; although the manufacturing
cost thereof is low, its application is inconvenient and not safe
enough either.
SUMMARY OF THE INVENTION
In view of the abovementioned needle stick injuries and shortcomings
of the prior art safety syringe, the primary objective of the present
invention is to provide a syringe designed to be operated by single
hand, to have an automatically retractable needle assembly not allowing
for reuse; the said automatically retractable safety syringe comprises
a needle assembly with a cannula a needle hub and a rubber O-ring
thereof, a needle cap, a retracting spring, a breakable plunger,
a plunger rubber gasket and a medicine barrel; in accordance with
the structure of the said automatically retractable safety syringe
of the present invention, since the breakable plunger is assembled
inside the medicine barrel, after being pushed all the way to the
end, it is forced to break automatically into two parts for reducing
it's length so as to provide enough space for the retracting spring
to drive the needle assembly moving along the sliding passages to
accomplish the automatically retracting action.
To enable a further understanding of the structural features and
the technical contents of the present invention, the brief description
of the drawings below is followed by the detailed description of
the preferred embodiment.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded drawing of the present invention.
FIG. 2 is an enlarged drawing of a needle head of the present invention.
FIG. 3 is a lateral view and exploded drawing of the present invention.
FIG. 4 is a lateral view and cross-sectional drawing of the present
invention.
FIG. 4A is a partially enlarged drawing of the present invention.
FIG. 4B is another partially enlarged drawing of the present invention.
FIG. 4C is also another partially enlarged drawing of the present
invention.
FIG. 5 is a drawing of the application of the present invention.
FIG. 6 is another drawing of the application of the present invention.
FIG. 7 is a drawing of the retracting action of the needle assembly
of the present invention.
FIG. 8 is another drawing of the retracting action of the needle
assembly of the present invention.
FIG. 9 is a drawing of the present invention in a destructive state.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
As indicated in FIG. 1 the exploded drawings of the present invention,
a needle assembly thereof has a cannula (80) and a needle hub (20)
with one end thereof used for receiving the cannula (80) to fitly
penetrate through its center; the circumference at the other end
is disposed with an annular rubber gasket groove (25) and the convex
torus thereof is disposed as a check plate (26) toward one end of
an retracting spring (40); a plurality of concave positioning slots
(22) are disposed in a proper area at two ends of the needle hub
(20) to connect a plurality of proceeding slopes (24) tapered upwardly,
a plurality of rotating slide passages (23) concaved inwardly and
slanted for rotation as well as to connect a plurality of communicating
slide passages (21) concaved inwardly to form an U-shaped slide
passage for the needle assembly to make retracting action; a needle
hub rubber gasket (30) is used for making a tight seal; an annular
retracting spring (40) compresses and expands to retract the needle
assembly; a plunger rubber gasket (50) is also used for making a
tight seal; a breakable inwardly retracting plunger (60) is disposed
with a long inwardly retracting rod (62) with one end disposed with
a rubber clip head (61) to clip the plunger rubber gasket (50) and
the other end thereof connected to one end of a hollow receiving
rod (66) to form a breakable area (63) in an annular or annular
block shape; the other end of the hollow receiving rod (66) is disposed
with a push grip (67); an annular bottom check ring (64) is disposed
in a proper area at the said two ends for controlling the bottom
position of the syringe; an annular fastening annular groove (65)
controls and fastens the breakable inwardly retracting plunger (60)
to break into two parts and rotate with the needle assembly for
completing inwardly retraction; the center of the hollow receiving
rod (66) has a space for receiving the inwardly retracting rod (62);
one end of a medicine barrel (70) is disposed with a plurality of
slightly resilient retaining hook (71) pointing to the center for
cooperating with the U-shape of the needle hub; the other end is
disposed with a handle lug (74); the aperture of one end of a communicating
inner barrel (72) is smaller than that of the inner barrel (72)
to form a check ring for stopping the other end of the retracting
spring (40); the other end of the said inner barrel (72) is disposed
with an annular convex ring (73) for controlling and positioning
the bottom check ring (64) and the fastening annular groove (65);
the said inner barrel (72) has the space for receiving the needle
assembly, the retracting spring (40), the breakable inwardly retracting
plunger (60) and the plunger rubber gasket (50) thereof; a needle
cap (10) covers to guard the needle assembly and fitly clips unto
the retaining hook (71) of the medicine barrel (70); when the needle
cap (10) is not separated from the retaining hook (71) of the medicine
barrel (70), the retaining hook (71) does not eject for the needle
assembly to retract.
As indicated in FIGS. 2 to 4C, the retaining hook (71) of the medicine
barrel (70) of the present invention retains into the positioning
slot (22) of the needle hub (20) to prevent the needle assembly
from retracting inwardly due to the tension of the spring (40),
as shown in FIG. 4A; one end of the long inwardly retracting rod
(62) connects to one end of the hollow receiving rod (66) to form
the breakable area (63) in an annular or annular block shape, as
shown in FIG. 4B; the annular convex ring (73) controls and positions
the bottom check ring (64) and the fastening annular groove (65),
as shown in FIG. 4C; referring to FIGS. 5 and 6 the retracting
spring (40) has a compressed space; the needle hub (20) is positioned
and the convex ring (73) is clipped at the bottom check ring (64);
the breakable inwardly retracting plunger (60) is forced inwardly;
the retaining hook (71) moves along the proceeding slope (24) to
reach the rotating slide passage (23); the retracting spring (40)
reaches the limit; the breakable inwardly retracting plunger (60)
breaks into two parts; the fastening annular groove (65) fitly clips
to the convex ring (73); as shown in FIGS. 7 and 8 after the breakable
inwardly retracting plunger (60) breaks into two parts, the retracting
spring (40) starts to expand to drive the needle hub (20) to rotate
and detach completely from the retaining hook (71) along the communicating
slide passage (21) till the needle assembly retracts all the way
into the inner barrel (72); FIG. 9 indicates the completely destructive
state of the plunger (60) of the present invention.
To assemble the present invention of an automatically retractable
safety syringe, the retracting spring (40) is first placed through
the convex ring (73) of the inner barrel (72), then one end of the
needle assembly penetrates through the retracting spring (40); the
check plate (26) on the other end stops one end of the retracting
spring (40); the positioning slot (22) of the needle hub (20) is
positioned and clipped to the retaining hook (71); the area of the
retracting spring (40) is in a halfway compressed state; then the
breakable inwardly retracting plunger (60) and the plunger rubber
gasket (50) retain with a retaining hole (51) via the rubber clip
head (61); finally, two sets are assembled and the needle cap (10)
is covered onto the retaining hook (71) to finish the assembly.
In accordance with the structure of the said automatically retractable
safety syringe of the present invention, after the breakable inwardly
retracting plunger assembled inside the medicine barrel is pushed
all the way to the end, it is forced to break automatically into
two parts for reducing it's length so as to provide enough space
for the retracting spring to drive the needle assembly moving along
the sliding passages for accomplishing the action of automatic retraction;
therefore the present invention has less parts and thereby requires
lower manufacturing cost; furthermore, the application is simple
and safe; the present invention can be manufactured as an automatically
retractable safety syringe in a smaller volume.
It is of course to be understood that the embodiment described
herein is merely illustrative of the principles of the invention
and that a wide variety of modifications thereto may be effected
by persons skilled in the art without departing from the spirit
and scope of the invention as set forth in the following claims.
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