Safety syringe abstract
A safety syringe for saving cost includes: a coupling member of
arrowhead shape integrally formed with the thin-disk plunger, an
annular ring embedded on the plunger to allow the plunger to be
slibably held in the syringe for injection use, a syringe cylinder
integrally formed with a sleeve portion on a front portion of syringe
cylinder, an annular depression formed at the lower portion of said
sleeve portion, a hollow needle which comprising a shank portion
and a needle portion, said shank portion which connected with needle
portion having a bias socket, said shank portion formed integrally
a downward depression in it's rear portion from middle portion of
the shank portion to somewhere beyond bias socket appropriate whereby
upon retraction of the plunger and the coupled needle into the syringe,
the needle will be inclined to prevent a further outward protruding
of the retracted needle, and said shank portion could be held in
the sleeve portion.
Safety syringe claims
I claim:
1. A safety syringe comprising a syringe means, a needle device
and a plunger means, in which:
said syringe means includes a hollow cylinder for filling liquid
medicine therein, and a reduced sleeve provided at a reduced shoulder
on a front portion of said cylinder having a central opening formed
a bottle-neck inside said sleeve, an outward flange and a inward
stop ring provided to a rear edge of said cylinder thereon;
said needle device includes a hollow needle having a needle tip
at a front portion, a resilient rubber shank fixedly held a rear
portion of said needle having an annular recess between a cylindrical
rear body and a streamline front body so as to be held in said sleeve
of said syringe means by said bottle neck therein, said cylindrical
rear body of said shank having a bias rear end surface and a bias
conical space formed of an arrowhead socket with a ratchet-means
gate at a center of said bias rear end surface led to a hollow center
of said hollow needle through said arrowhead socket therefrom;
said plunger means is made of solid plastic comprising a plunger
head having a annular ring groove and a plunger ring been received
therein which slibably held in said cylinder of said syringe means
to push liquid medicine for injection operation, an arrowhead coupling
member forwardly disposed to a center of a front end of said plunger
head having a ratchet-means neck at a root portion thereof which
said arrowhead will be inserted into said bias arrowhead socket
through said ratchet-means gate of said rear body of said shank
and firmly engaged said needle device to said plunger means together
as said ratchet-means neck of said arrowhead of said plunger head
been caught by said ratchet-means gate of said shank while said
plunger means been fully pushed forward during finished an injection
operation, furthermore said bias arrowhead socket of resilient material
been distorted to a right status from a bias status by said arrowhead
of solid material forced thereinto, simultaneously an insilient
strain been stored in the resilient material of said rear body of
said shank which caused said needle tip to be biased to said sleeve
of said syringe means inside said cylinder while said needle device
been fully pulled back into said cylinder by a retracting of said
plunger means after an injection operation and then said needle
will be bent and destroyed and safely remain in said cylinder while
said needle tip be blocked against said reducing shoulder of said
cylinder during said plunger means been pushed again forwardly into
said cylinder after a fully retracting of said plunger means; a
thin disk provided to a plunger rod behind said plunger head to
an appropriate distance for limiting a drawn back motion of said
plunger means in contacting against to said stop ring of said cylinder
thereof, a plunger rod formed of three blades protruding radially
from a longitudinal center line of said plunger means disposed to
a rear face of said plunger head and extended longitudinally out
to said stop ring of said cylinder, and an end plate disposed to
a rear end of said plunger rod for handling the pushing or pulling
operation of said plunger means therefor.
2. A safety syringe as claimed in claim 1 wherein said plunger
rod is formed of three blades radially from a longitudinal center
line of said plunger means.
3. A safety syringe as claimed in claim 1 wherein said thin disk
provided to said plunger rod has been set an appropriate distance
from said plunger head to provide enough space for retracting whole
said needle fully into said cylinder and to prevent said plunger
means from being pulled off from said cylinder because of an abutment
of said thin disk with said stop ring of said cylinder during a
pulling back motion of said plunger means.
Safety syringe description
BACKGROUND OF THE INVENTIONS
U.S. Pat. No. 5402327 entitled "Simplified Safety Syringe
with Retractable Self-biased Needle" issued to the same inventor
of this application diclosed a safety syringe including:a hollow
needle normally held in a front portion of a syringe, a coupling
member of arrowhead shape integrally formed with the thin-disk plunger,
an annular ring embedded on the plunger to allow the plunger to
be slibably held in the syringe for injection use, the coupling
member formed on the plunger engageable with a biasing socket recessed
in a rear needle portion of the hollow needle and with the biasing
socket generally formed as a conical shape having a longitudinal
conical axis inclined from a needle axis of the needle, wherby upon
retraction of the plunger and the coupled needle into the syringe,
the needle will be inclined to prevent a further outward protoruding
of the retracted needle.
However, the needle portion 21 having an arcunte packing ving 26a
circumferentialy disposed around the shank portion 22 to be engageably
held in the ving groove 120a in the sleeve portion 12 Since the
safety syringe is always made as disposable and will be disposed
once being used for hygienic reason, such a big plunger, which is
always made of resilient rubber materials, will waste money and
will also increase a burden for waste disposal and treatment on
a viewpoint of environmental protection.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a safety syringe
for saving cost and including: a coupling member of arrowhead shape
integrally formed with the thin-disk plunger, an annular ring embedded
on the plunger to allow the plunger to be slibably held in the syringe
for injection use, a syringe cylinder integrally formed with a sleeve
portion on a front portion of syringe cylinder, an annular depression
formed at the lower portion of said sleeve portion, a hollow needle
which comprising a shank portion and a needle portion, said shank
portion which connected with needle portion having a bias socket,
said shank portion formed integrally a downward depression in it's
rear portin from middle portion of the shank portion to somewhere
beyond bias socket appropriate whereby upon retraction of the plunger
and the coupled needle into the syringe, the needle will be inclined
to prevent a further outward protruding of the retracted needle,
and said shank portion could be held in the sleeve portion.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an illustration showing the syringe and the needle in
accordance with the present invention.
FIG. 2 is an illustration showing the present invention when served
for injection use.
FIG. 3 shows coupling of the plunger with the needle when finishing
a medical injection.
FIG. 4 shows retraction of needle into the syringe of the present
invention.
FIG. 5 shows a bent needle in the syringe in accordance with the
present invention.
FIG. 6 is an illustration showing the plunger of the present invention
is perspective view.
FIG. 7 is an illustration showing the plunger rod with three blades
of the present inveniton in section view.
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
defined 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 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 an despression 120 longitudinaly and circumferentially
recessed at the rear portion of the sleeve portion 12 a syringe
handle 14 formed on a rear end portion of the 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 a downwand
depresion at the lower inner of shank portion from middle of the
shank portion to somewhere beyond bias socket appropriate, then
formed an annular recess at the bottom of depression, whereby said
shank portion could be held in the spring means. The shank portion
22 to be engageably held in the syringe means, 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 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 forwardiy from the rear needle end portion 230 and a needle
axis 200 longitudinally defined at a central portion of the needle
device 2 with the shank protion 22 and the rear needle end portion
230 made of resilient plastic materials.
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 generally 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 conical bottom 271 includes a ratchet-tooth recess 271a
circumferentially recessed in a rear portion of the shank portion
22 and tapered radially rearwardly from the conical bottom 271 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 thin-disk plunger 31a slibably
held in the syringe cylinder 11 of the syringe means 3 a coupling
member 30 integrally formed on a front portion of the plunger 31
having the arrowhead portion 301 formed on a from end of the coupling
member 30 operatively insertable in the biasing socket 27 formed
in the needle device 2 with the rear needle end portion 230 confined
within the diverging port 122 formed in a rear portion of a sleeve
portion 12 of the syringe means 1 a plunger rod 35 including three
blades 351 protruding radially from a plunger axis 300 of the plunger
means 3 integrally secured with a plunger handle 37 and protruding
rearwardly from the plunger 31a and integrally connected to the
plunger for pushing operation of the plunger 31a with the plunger
31a to be rearwardly retained on the an annular extension 16 formed
in a rear portion of the syringe cylinder 11 for restriction a rear
movement of the plunger 31a, and a plunger axis 300 longitudinally
defined at 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 1 00 of the syringe means 1.
The coupling member 30 includes: te arrowhead portion 301 being
conical shaped and engageable with the biasing socket 27 of conical
shape of the needle device 2 having an apex 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 ponger 31a.
The arrowhead portion 301 is formed with a ratchet tooth 301a circumferentially
disposed around a rear end perimeter of the arrowhead portion 301
to be engaged with the ratchet-tooth recess 271a in the biasing
socket 27 in the needle device 2 for ensuring a firm engagement
of the coupling member 30 with the socket 27 of the needle device
2 for reliably coupling the needle device 2 with the plunger 31a
when retracted into the syringe cylinder 11.
The plunger 31a is formed with an annular recess 311a along a periphery
of the plunger 31a for embedding an annular packing ring 38 in the
annular recess 31 1a for a smooth sealable sliding of the plunger
31a in the syringe cylinder 11. The annular packing ring 38 may
have a cross sertion 302 connected between the arrowhead portion
301 and the pluction of circular shape, but not limited in this
invention.
When using the present invention for injection use as shown in
FIG. 2 the plunger 31a may be pushed for wardly 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 20 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 sown in FIG.
3.
After retracting, the plunger 31a and the coupled needle device
2 into the bore portion 10 of the syringe cylinder 11 as shown in
FIG. 4 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
FIG. 3 therby automatically obliquely biasing the needle device
2 coupled on the plunger 31a as shown in FIG. 4. After re-protruding
the needle device 2 outwardly, the needle tip 211 will be retarded
against a shoulder portion 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 tim earlier invention, U.S.
Pat. No. 5405327 also issued to the same inventor of this application
since the the shank portion 22 of needle device 2 has been formed
integvally and the plunger rod 35 of the earler invention has been
minimized to merely include three blodes, thereby saving cost and
being helpful for environmental protection.
The arrowhead portion 301 the neck portion 302 the plunger rod
35 and the handle 37 are all integrally formed shch as made by plastic
molding process, and the annular ring 38 is then embedded in the
recess 311a of the thin-disk plunger 31a.
The plunger means 3 in its prefrred form shown in FIG. 6 provides
additional thin disk 39 integrally formed with the plunger rod 35
at a front portion of said plunger rod 35 and been set and kept
appropriate distance from said thin-disk plunger 31a, FIG. 7 is
its section view. |