Safety syringe abstract
A safety syringe cylinder has a structure for attaching a syringe
needle precisely. The syringe needle can be retracted into the syringe
cylinder for bending. A hook seat is formed at a lower end of the
needle. An annular hook groove is formed at a top end of the push
rod cap. The hook seat is engaged with the annular hook groove so
as to control the displacement and bending process of the syringe
needle. Thereby, the processing of undesired syringe needle is safe,
reliable and convenient.
Safety syringe claims
What is claimed is:
1. A safety syringe cylinder comprising a syringe cylinder, a syringe
needle, a push rod; wherein an upper end of the syringe cylinder
has a syringe connecting seat; and a center of the syringe connecting
seat has a positioning groove; an upper end of the syringe needle
is a needle tube and a lower end thereof is a needle; a lower end
of the needle has a hook seat; two wedge rings are arranged around
the needle; a center of the hook seat is a channel hole; the channel
hole penetrates through the needle so as to communicate with the
needle tube, a top of the push rod has a push rod body which is
formed with a connecting block; the connecting block is inserted
into the combining hole of a push rod cap; the push rod cap is made
of elastic material; a periphery of the push rod cap has a positioning
groove; a top center of the push rod cap has an annular hook groove;
the hook groove has two stepped enlarged holes; thereby, the syringe
needle is combined with the positioning hole of the syringe connecting
seat of the syringe cylinder; and push rod is inserted into the
cylinder body of the syringe cylinder.
2. The safety syringe cylinder as claimed in claim 1 wherein a
periphery of the needle has a protruding ring and the positioning
hole of the syringe connecting seat has a positioning groove; the
positioning groove is engaged with the protruding ring.
3. The safety syringe cylinder as claimed in claim 1 wherein a
lower end of the cylinder body has a protruding ring which is matchable
with a positioning groove in the rod cap of the push rod so as to
confine the retracted range of the cylinder body.
4. The safety syringe cylinder as claimed in claim 1 wherein the
hook seat of the syringe needle has a guide hole for guiding the
flow of syringe liquid.
5. The retractable safety syringe cylinder as claim in claim 1
wherein an inner upper end of the syringe cylinder is installed
with an annular ring; the annular ring is embedded into the hook
groove on the top surface of the push rod cap when the push rod
moves upwards to a top end of the syringe cylinder so as to prevent
the injection liquid remained in the hook groove.
6. The safety syringe cylinder as claimed in claim 1 wherein the
push rod is formed with a through hole, Thereby, the push rod can
be broken for re-use or discard.
Safety syringe description
FIELD OF THE INVENTION
[0001] The present invention relates to medical devices, and particularly
to a safety syringe cylinder having a structure for attaching a
syringe needle precisely and the processing of undesired syringe
needle is safe, reliable and convenient.
BACKGROUND OF THE INVENTION
[0002] Subcutaneous injections are frequently used in the medical
treatment. Retractable safety syringe injectors are especially suitable
for subcutaneous injection, which has the following advantages:
[0003] 1. The retractable safety syringe cylinder is safe and retractable
so as not to hurt anybody.
[0004] 2. The retractable safety syringe cylinder has a self-destroy
function. If an overlarge force is used to break the syringe cylinder,
the needle will not be ejected out.
[0005] 3. It is disposable after used once.
[0006] 4. The use of the retractable safety syringe cylinder is
similar to the conventional injector, it can be operated by a simple
training.
[0007] FIG. 12 shows the structure of a retractable safety syringe
cylinder. It contains a syringe cylinder 1 a syringe needle 2
a push rod 3 and others. The upper end of the syringe cylinder
1 has a syringe connecting seat 11 having a positioning hole 110
therein. The hole has a positioning groove 111 for retaining the
syringe needle 2. The push rod 3 has a rod cap 30 which has a hook
body 301. The needle of the syringe needle 2 has a slot 201. A periphery
of the needle has a ring retained by the positioning groove 111
as shown in FIG. 11.
[0008] The use of the retractable safety syringe cylinder will
be described herein. At first, the injector is checked. After injection,
the hook body 301 can be inserted to the slot 201 correctly. The
syringe needle 2 is exactly combined to the hook body 301 at a top
of the push rod 3. When the push rod 3 is pulled backwards, the
syringe needle 2 will retract into the syringe cylinder 1. When
the push rod 3 is pressed again, the syringe needle 2 is bent and
deformed in the syringe cylinder 1 so as to prevent from hurting
anybody as it is deserted.
[0009] Although this retractable safety syringe cylinder has many
advantages, when the push rod 3 is pulled backwards, the push rod
3 will rotate and thus the hook body 301 can not be inserted into
the slot 201. Thus, the push rod 3 must be rotate again so that
the hook body 301 and the hook groove 201 are engaged again. The
operation is inconvenient.
SUMMARY OF THE INVENTION
[0010] Accordingly, the primary object of the present invention
is to provide a safety syringe cylinder having a structure for attaching
a syringe needle precisely. The syringe needle can be retracted
into the syringe cylinder for bending. A hook seat is formed at
a lower end of the needle. An annular hook groove is formed at a
top end of the push rod cap. The hook seat is engaged with the annular
hook groove so as to control the displacement and bending process
of the syringe needle. Thereby, the processing of undesired syringe
needle is safe, reliable and convenient.
[0011] The various objects and advantages of the present invention
will be more readily understood from the following detailed description
when read in conjunction with the appended drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] FIG. 1 is a structural schematic view of the present invention.
[0013] FIG. 2 is an exploded perspective view of the present invention.
[0014] FIG. 3 shows one embodiment of the present invention.
[0015] FIG. 4 is a partial structural view of the present invention.
[0016] FIG. 5 is a partial structural view of the present invention.
[0017] FIG. 6 is a partial structural view of the present invention.
[0018] FIG. 7 is a structural schematic view of the present invention.
[0019] FIG. 8 is a partial structural schematic view of one embodiment
of the present invention.
[0020] FIG. 9 shows one structural schematic view of one embodiment
of the present invention.
[0021] FIG. 10 is a schematic view of one embodiment of the present
invention, where the present invention is pulled backwards.
[0022] FIG. 11 is a structural schematic view of a prior art structure.
[0023] FIG. 12 is a partial schematic view of the prior art.
DETAILED DESCRIPTION OF THEE PREFERRED EMBODIMENTS
[0024] Referring to FIGS. 1 and 2 the safety syringe cylinder
of the present invention is illustrated. The safety syringe cylinder
includes a syringe cylinder 1 a syringe needle 2 a push rod 3
and others.
[0025] The upper end of the syringe cylinder 1 has a syringe connecting
seat 11. The syringe connecting seat 11 has a positioning groove
111. The inner upper end of the syringe cylinder 1 is installed
with an annular ring 13. The lower end of the cylinder body 12 has
a cylindrical ring 121.
[0026] An upper end of the syringe needle 2 is a needle tube 22
and the lower end is a needle 21. A periphery of the needle 21 has
a protruding ring 211 and a lower end of the needle 21 has a hook
seat 23. Two wedge rings 231 are arranged around the needle 21.
A center of the hook seat 23 is a channel hole 230. The channel
hole 230 penetrates through the needle 21 so as to communicate to
the needle tube 22. The hook seat 23 is installed with a guide hole
232 as shown in the FIGS. 3 and 4.
[0027] A top of the push rod 3 has a push rod body 32 which is
formed with a connecting block 321. The connecting block 321 is
inserted into the combining hole 313 of a push rod cap 31 as shown
in FIG. 5. The push rod cap 31 can be made of elastic material.
A periphery of the push rod cap 31 has a positioning groove 312.
A top center of the push rod cap 31 has an annular hook groove 311.
The hook groove 311 has two stepped enlarged holes 3111. The rod
body 32 has a through hole 320 as shown in the FIGS. 2 3 and 5.
[0028] Thereby, the syringe needle 2 can pass through the positioning
hole 110 of the syringe connecting seat 11 of the syringe cylinder
1. The positioning groove 111 in the positioning hole 110 is engaged
with the protruding ring 211 of the needle 21. The guide hole 232
on the hook seat 23 of the syringe needle 2 is helpful to guide
the injection liquid.
[0029] Thereby, the annular ring 13 at the upper end of the syringe
cylinder 1 can be embedded into the hook groove 311 on the top surface
of the push rod cap 31 when the push rod 3 moves upwards to the
top end so as to prevent the injection liquid remained in the hook
groove 311. The cylinder body 12 of the cylinder 1 has a cylindrical
ring 121 which is engaged to the positioning groove 312 installed
at the push rod cap 31 at the top of the push rod. Thus, when the
push rod is drawn out, the cylinder body 12 will not be drawn out.
[0030] By above construction, the safety syringe cylinder can be
formed. The retractable safety syringe cylinder of the present invention
is used once for preventing from being infected. Referring to FIG.
3 the syringe cylinder 1 is full of injection liquid. By pushing
the push rod 3 the liquid will flow through the channel hole 230
of the needle 2 and then is sent out form the syringe tube 22. By
further pushing the push rod 3 after all the liquid has been sent
out, the push rod cap 31 at the top of the push rod 3 exactly resists
against the hole seat 23 of the needle 21. The annular hook groove
311 is installed at the top surface of the push rod cap 31. The
hook seat 23 of the needle 21 is exactly inserted into the hook
groove 311. The hook seat 23 does not shift from the annular hook
groove 311 of the push rod cap 3 despite of the rotation and movement
of the push rod 3. Referring to FIGS. 6 and 7 the hook seat 23
is inserted into the hook groove 311. By the engagement of the wedge
rings 231 and the enlarged holes 3111 if the syringe needle 2 retracts,
it will leave from the syringe connecting seat 11 to be within the
cylinder body 12 as shown in the FIG. 9. By the wedge rings 231
to be loosely engaged with the enlarged holes 3111 although the
syringe needle 2 can not leave from the syringe cylinder, but it
can shift. With reference to FIG. 8 when the syringe needle 2 shifts
to one side, the push rod can be pushed further. Then the syringe
needle 2 will bent in the cylinder body 12. Then the push rod is
retracted again, and thus the push rod body 32 can break through
the through hole 320 as shown in FIG. 10 without piercing operator.
[0031] The present invention is thus described, it will be obvious
that the same may be varied in many ways. Such variations are not
to be regarded as a departure from the spirit and scope of the present
invention, and all such modifications as would be obvious to one
skilled in the art are intended to be included within the scope
of the following claims. |