Safety syringe abstract
A safety syringe includes: a hollow needle normally held in a front
portion of a syringe, a plunger slidably held in the syringe for
injection use, a coupling member retained in the plunger engageable
with at least a biasing socket recessed in a rear needle portion
of the hollow needle with the biasing socket generally formed as
a conical shape having a longitudinal conical axis inclined from
a needle axis of the needle when normally fixed in the syringe with
the needle axis aligned with a syringe axis longitudinally formed
in a center line of the syringe, whereby upon retraction of the
plunger and the needle coupled to the plunger, with the biasing
socket of the needle forcibly coupled with the coupling member,
into a bore portion in the syringe, the needle will be automatically
inclined as the biasing socket of the needle is restored by the
coupling member retained in the plunger to prevent an outward protruding
of the retracted needle from the syringe for preventing its pricking
to the others.
Safety syringe claims
I claim:
1. A safety syringe comprising:
a syringe means including a syringe cylinder having a hollow bore
portion for filling liquid medicine therein, and a sleeve portion
formed on a front portion of said syringe means having a central
opening formed through the sleeve portion, a syringe axis longitudinally
defined in a central portion of said syringe means;
a needle device including a hollow needle portion fixed on a shank
portion held in said sleeve portion of said syringe means having
at least a biasing socket generally conical shaped recessed in a
rear needle portion of said needle device having a longitudinal
conical axis obliquely deviating an acute angle from a needle axis
which is longitudinally defined in a central portion of said needle
device and is aligned with the syringe axis of said syringe; and
a plunger means including a plunger slidably held in said syringe
cylinder for boosting liquid medicine in said cylinder for injection
through said needle device, and a coupling member embedded in said
plunger having an arrow head portion formed at a front end of said
coupling member operatively forcibly inserted in said biasing socket
to couple the arrowhead portion with the needle device to store
a resilient restoring energy of the rear needle portion of said
needle device after finishing an injection, and upon retraction
of the plunger and the needle device coupled to said plunger into
said syringe cylinder, said needle device will be automatically
restored and obliquely biased to prevent outwardly re-protruding
of said needle device from said syringe means.
2. A safety syringe according to claim 1 wherein said needle device
(2) includes: a needle portion (21) having a needle tip (211) formed
at a front end of the needle portion (21), a shank portion (22)
connected with the needle portion (21) having an annular packing
ring (26) circumferentially disposed around the shank portion (22)
to be engageably held in the ring groove (120) in the sleeve portion
(12), a bifurcated slot (25) longitudinally formed in a rear portion
of the shank portion (22) and recessed forwardly from a rear needle
end portion (230), at least a biasing socket (27) generally conical
shaped formed in a rear portion of the shank portion (22) and communicating
with a guiding port (231) recessed forwardly from the rear needle
end portion (230), and a needle axis (200) longitudinally defined
in a central portion of the needle device (2), with the shank portion
(22) and the rear needle end portion (230) made of resilient plastic
materials.
3. A safety syringe according to claim 2 wherein each said biasing
socket (27) generally conical shaped includes: a conical bottom
(271), a conical apex (272) tapered forwardly from the conical bottom
(271), and a longitudinal conical axis (270) aligned with the conical
apex (272) to be perpendicular to the conical bottom (271) and to
be inclinedly deviated from the needle axis (200) of the needle
device (2) to define an acute angle A between the needle axis (200)
and the longitudinal conical axis (270) of the biasing socket (27),
said biasing socket (27) snugly engageable with an arrowhead portion
(301) of the plunger means (3) for obliquely biasing the needle
device (2) when coupled to the plunger means (3) and retracted in
the syringe cylinder (11) after finishing an injection.
4. A safety syringe according to claim 3 wherein said plunger
means (3) includes: a plunger (31) slidably held in the syringe
cylinder (11) of the syringe means (3), a coupling member (30) retained
in a conical recess (34) in the plunger (31) having the arrowhead
portion (301) formed on a front end of the coupling member (30)
operatively insertable in a biasing socket (27) formed in the needle
device (2), a holding socket (32) concentrically disposed around
the arrowhead portion (301) for operatively coupling a rear needle
end portion (230) when bifurcated by the arrowhead portion (301)
inserted into the biasing socket (27), with the rear needle end
portion (230) confined within a diverging port (122) formed in a
rear portion of a sleeve portion (12) of the syringe means (1),
a plunger rod (35) having a plunger handle (37) protruding rearwardly
from the plunger (31) for pushing operation of the plunger (31)
with the plunger (31) formed with an annular recess (311) in the
plunger (31) to be engaged with an annular extension (16) formed
on a rear portion of the syringe cylinder (11) for restricting a
rear movement of the plunger (31), and a plunger axis (300) longitudinally
defined in a central portion of the syringe means (3) normally aligned
with a needle axis (200) of the needle device (2), and aligned with
the syringe axis (100) of the syringe means (1).
5. A safety syringe according to claim 4 wherein said coupling
member (30) includes: the arrowhead portion (301) being conical
shaped and engageable with a conical shaped biasing socket (27)
of the needle device (2) having an apex of said arrowhead portion
(301a) aligned with the plunger axis (300), the needle axis (200)
and the syringe axis (100) ready for a normal medical injection,
a neck portion (302) connected with the arrowhead portion (301),
and a conical base portion (303) having an annular protrusion (304)
circumferentially formed on a conical surface of the base portion
(303) for well sealable embedding of the conical base portion (303)
in the conical recess (34) in the plunger (31), with the conical
base portion (303) secured to a plunger rod (35) of the plunger
means (3).
Safety syringe descriptionBACKGROUND OF THE INVENTION
U.S. Pat. No. 5232458 entitled "Safety Syringe with Retractable
Self-biased Needle" issued to the same inventor of this application
disclosed a needle secured in a plug 13 embedded in a front portion
of the syringe having a needle head portion formed on a rear portion
of the needle and a plunger slidably held in the syringe having
a biasing socket recessed in a front portion of the plunger engageable
with the needle head portion for biasing the needle obliquely within
the syringe when retracting the plunger and the needle into the
syringe, thereby preventing an outward protruding of the retracted
needle for preventing its injury to the surroundings.
However, the plug 13 should be provided in a front portion of the
syringe for holding the needle 2 in the plug 13 to be normally positioned
at a front portion of the syringe 1 for injection use.
In order to save material cost and enhance assembly convenience
of such a safety syringe, the plug 13 is expected to be eliminated
or omitted, and the needle 2 would then be directly secured at a
front portion of the syringe 1 for simplifying its production and
decreasing its cost.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a safety syringe
including: a hollow needle normally held in a front portion of a
syringe, a plunger slidably held in the syringe for injection use,
a coupling member retained in the plunger engageable with at least
a biasing socket recessed in a rear needle portion of the hollow
needle with the biasing socket generally formed as a conical shape
having a longitudinal conical axis inclined from a needle axis of
the needle when normally fixed in the syringe with the needle axis
aligned with a syringe axis longitudinally formed in a center line
of the syringe, whereby upon pushing of the plunger to the needle
by forcibly inserting the coupling member into the biasing socket
when finishing the injection, the biasing socket will be forcibly
coupled with the coupling member, and upon retraction of the plunger
and the needle into a bore portion in the syringe, the needle will
be automatically inclined when the needle is restored by the coupling
member in the plunger by smoothly engaging the coupling member with
the biasing socket to prevent an outward protruding of the retracted
needle from the syringe for preventing its pricking to the others.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an illustration showing the present invention ready for
injection use.
FIG. 2 shows coupling of the plunger with the needle when finishing
a medical injection.
FIG. 3 shows retraction of needle into the syringe of the present
invention.
FIG. 4 shows a bent needle in the syringe in accordance with the
present invention.
FIG. 5 is an illustration showing the needle of the present invention.
FIG. 6 shows a coupling member coupled with a rear needle portion
in accordance with the present invention.
FIG. 7 shows an inclined needle when retracted in the syringe of
the present invention.
DETAILED DESCRIPTION
As shown in the drawing figures, the present invention comprises:
a syringe means 1 a needle device 2 and a plunger means 3.
The syringe means 1 includes: a syringe cylinder 11 having a hollow
bore portion 10 defined in the syringe cylinder 11 for filling liquid
medicine 4 in the cylinder 11 and a syringe axis 100 longitudinally
existing in a central portion of the syringe cylinder 11 a sleeve
portion 12 formed on a front portion of the syringe cylinder 11
contracted forwardly from the cylinder 11 having a central opening
121 formed through the sleeve portion 12 and a diverging port 122
formed in a rear portion of the sleeve portion 12 adjacent to the
syringe cylinder 11 a ring groove 120 annularly recessed in a front
portion of the sleeve portion 12 a syringe handle 14 formed on
a rear end portion of the cylinder 11 a blocking ring 15 annularly
formed at a rear end portion of the sleeve portion 12 between the
central opening 121 of the sleeve portion 12 and the bore portion
10 of the syringe cylinder 11 and an annular extension 16 annularly
formed on a rear portion of the cylinder 11.
The needle device 2 includes: a needle portion 21 having a needle
tip 211 formed at a front end of the needle portion 21 a shank
portion 22 connected with the needle portion 21 having an annular
packing ring 26 circumferentially disposed around the shank portion
22 to be engageably held in the ring groove 120 in the sleeve portion
12 a bifurcated slot 25 longitudinally formed in a rear portion
of the shank portion 22 and recessed forwardly from a rear needle
end portion 230 at least a biasing socket 27 generally conical
shaped formed in a rear portion of the shank portion 22 and communicating
with a guiding port 231 recessed forwardly from the rear needle
end portion 230 and a needle axis 200 longitudinally existing in
a central portion of the needle device 2 with the shank portion
22 and the rear needle end portion 230 made of resilient plastic
materials.
The biasing socket 27 may be formed with plural sockets, such as
two sockets 27 27a, juxtapositionally recessed in the rear needle
portion of the needle device 2 which are not limited in this invention.
The needle axis 200 will be aligned with the syringe axis 100 when
the needle device 2 is normally secured on a sleeve portion 12 of
the syringe means 1 for injection purpose.
Each biasing socket 27 generally conical shaped includes: a conical
bottom 271 a conical apex 272 tapered forwardly from the conical
bottom 271 and a longitudinal conical axis 270 aligned with the
conical apex 272 to be perpendicular to the conical bottom 271 and
to be inclinedly deviated from the needle axis 200 of the needle
device 2 to define an acute angle A between the needle axis 200
and the longitudinal conical axis 270 of the biasing socket 27.
The biasing socket 27 is snugly engageable with an arrowhead portion
301 of the plunger means 3 for obliquely biasing the needle device
2 when coupled to the plunger means 3 and retracted in the syringe
cylinder 11 after finishing an injection.
The plunger means 3 includes: a plunger 31 slidably held in the
syringe cylinder 11 of the syringe means 3 a coupling member 30
retained in a conical recess 34 in the plunger 31 having the arrowhead
portion 301 formed on a front end of the coupling member 30 operatively
insertable in a biasing socket 27 formed in the needle device 2
a holding socket 32 concentrically disposed around the arrowhead
portion 301 for operatively coupling a rear needle end portion 230
when bifurcated by the arrowhead portion 301 inserted into the biasing
socket 27 with the rear needle end portion 230 confined within
a diverging port 122 formed in a rear portion of a sleeve portion
12 of the syringe means 1 a plunger rod 35 having a plunger handle
37 protruding rearwardly from the plunger 31 for pushing operation
of the plunger 31 with the plunger 31 formed with an annular recess
311 in the plunger 31 to be engaged with an annular extension 16
formed in a rear portion of the syringe cylinder 11 for restricting
a rear movement of the plunger 31 and a plunger axis 300 longitudinally
defined in a central portion of the syringe means 3 normally aligned
with a needle axis 200 of the needle device 2 and aligned with
the syringe axis 100 of the syringe means 1.
The coupling member 30 includes: the arrowhead portion 301 being
conical shaped and engageable with a conical shaped biasing socket
27 of the needle device 2 having an apex 301a of the arrowhead portion
301 aligned with the plunger axis 300 the needle axis 200 and the
syringe axis 100 as shown in FIG. 1 ready for a normal medical injection,
a neck portion 302 connected with the arrowhead portion 301 and
a conical base portion 303 having an annular protrusion 304 circumferentially
formed on a conical surface of the base portion 303 for well sealable
embedding of the conical base portion 303 in the conical recess
34 in the plunger 31 with the conical base portion 303 secured
to a plunger rod 35 of the plunger means 3.
When using the present invention for injection use as shown in
FIG. 1 the plunger 31 may be pushed forwardly to boost the medicine
4 in the cylinder 11 through the needle device 2 to a patient's
body.
The arrowhead portion 301 of the coupling member 30 will then be
forcibly inserted into the biasing socket 27 of the needle device
2 to squeeze, and expansively bifurcate the rear needle portion
230 of the needle device 2 to store a resilient potential energy
of the bifucated rear needle portion, thereby operatively coupling
the coupling member 30 with the needle device 2 as shown in FIGS.
2 6.
After retracting the plunger 31 and the coupled needle device 2
into the bore portion 10 of the syringe cylinder 11 as shown in
FIG. 3 the biasing socket 27 of the needle device 2 will be restored
to be snugly engaged with the arrowhead portion 301 of the coupling
member 30 of the plunger means 3 by releasing a resilient force
accumulated on the rear needle portion 230 when forcibly coupling
the arrowhead portion 301 with the biasing socket 27 as shown in
FIGS. 2 and 6 thereby automatically obliquely biasing the needle
device 2 coupled on the plunger 31 as shown in FIGS. 7 and 3. After
re-protruding the needle device 2 outwardly, the needle tip 211
will be retarded against the blocking ring 15 formed in a front
portion of the cylinder 11 thereby bending the needle 2 and obstructing
its outward protrusion and preventing its injury or contamination
to the surroundings.
The present invention is superior to the earlier invention, U.S.
Pat. No. 5232458 also issued to the same inventor of this application
since the plug 13 of the earlier invention has been eliminated,
thereby saving cost and enhancing installation convenience.
Meanwhile, the needle device 2 can be conveniently replaced with
diversified sizes (number of needles) directly by withdrawing a
used needle 2 from the sleeve portion 12 and then by re-inserting
a new needle into the sleeve portion 12 through a front opening
end of the sleeve portion 12. |