Safety syringe abstract
An automatically retractable safety syringe includes a needle assembly
consisting of a connula, 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
1. An automatically retractable safety syringe to be adopted for
injecting medicine comprises a needle cannula as well as a rotary
and movable needle hub; a retracting spring expands to receive a
needle assembly in the interior space for storing kinetic energy;
a breakable inwardly retracting plunger is capable of breaking into
two parts; a plunger rubber gasket is used for making a tight seal;
a needle hub rubber gasket is also used for making a tight seal;
a needle cap is used for covering and guarding the needle assembly
as well as clipping onto a retaining hook of a medicine barrel;
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 can't retract either; an internal body of the
medicine barrel has the space for action of the needle assembly,
the retracting spring, the breakable inwardly retracting plunger
and the plunger rubber gasket; the present invention is characterized
that when the retracting spring area is over the halfway retracting
state, the breakable inwardly retracting plunger drives the needle
assembly and presses the retracting spring to a proper area; after
the breakable inwardly retracting plunger breaks into two parts,
the retracting spring starts to expand to drive the needle assembly
to rotate along the preset sliding passage for accomplishing the
automatically retracting action.
2. An 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; the said convex torus is disposed as a check plate
at one end of an retracting spring; a plurality of concave positioning
slots are disposed in a proper area 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 automatically retracting safety syringe according to claim
1 wherein a breakable inwardly retracting plunger is disposed with
a long inwardly retracting rod with one end thereof disposed with
a rubber clip head to clip with the plunger rubber gasket and the
other end thereof connected to one end of a hollow receiving rod
to form a breakable cutting edge area in an annular or annular block
shape; the other end of the hollow receiving rod is disposed with
a push grip; an annular bottom check ring is disposed in a proper
area at the said two ends for controlling the bottom position of
the syringe; an annular fastening annular groove controls and fastens
the breakable inwardly retracting plunger to break into two parts
and rotate with the needle assembly for completing inwardly retraction;
the center of the circumference of the hollow receiving rod has
a space for receiving the inwardly retracting rod.
4. An automatically retracting safety syringe according to claim
1 wherein one end of the cylindrical medicine barrel is disposed
with a plurality of slightly resilient retaining hooks pointing
to the center of the circumference for cooperating with the U-shape
of the needle hub; the other end is disposed with a handle lug;
the aperture of one end of a communicating inner barrel is smaller
than that of the inner barrel to form a check ring for stopping
the other end of the retracting spring; the other end of the said
inner barrel is disposed with an annular convex ring for controlling
and positioning the bottom check ring and the fastening annular
groove; the said inner barrel has the space for receiving the needle
assembly, the retracting spring, the breakable inwardly retracting
plunger and the plunger rubber gasket thereof.
Safety syringe description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] 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.
[0003] 2. Description of the Prior Art
[0004] 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
[0005] 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.
[0006] 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
[0007] FIG. 1 is an exploded drawing of the present invention.
[0008] FIG. 2 is an enlarged drawing of a needle head of the present
invention.
[0009] FIG. 3 is a lateral view and exploded drawing of the present
invention.
[0010] FIG. 4 is a lateral view and cross-sectional drawing of
the present invention.
[0011] FIG. 4A is a partially enlarged drawing of the present invention.
[0012] FIG. 4B is another partially enlarged drawing of the present
invention.
[0013] FIG. 4C is also another partially enlarged drawing of the
present invention.
[0014] FIG. 5 is a drawing of the application of the present invention.
[0015] FIG. 6 is another drawing of the application of the present
invention.
[0016] FIG. 7 is a drawing of the retracting action of the needle
assembly of the present invention.
[0017] FIG. 8 is another drawing of the retracting action of the
needle assembly of the present invention.
[0018] FIG. 9 is a drawing of the present invention in a destructive
state.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0019] 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.
[0020] 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.
[0021] 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.
[0022] 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.
[0023] 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. |