Safety syringe abstract
A retractable safety syringe cylinder has a structure which precisely
hooks the syringe needle for retracting the syringe in the syringe
cylinder for bending A hole seat at a lower end of the syringe needle
is matched to a hook body at a top surface of a rod cap of a push
rod. After pushing injection liquid, the two are engaged so as to
control the displacement of the syringe needle. Thus, the waste
from the syringe is controllable and the operation is convenient.
Safety syringe claims
What is claimed is:
1. A retractable safety syringe cylinder comprising a syringe cylinder,
a syringe needle, and a push rod; characterized in that: an upper
end of the syringe cylinder has a syringe connecting seat and the
syringe connecting seat has a positioning hole at a center thereof;
an upper end of the syringe needle is a needle tube and the lower
end thereof is a needle; a lower end of the needle has a hole seat;
a lower end of the hole seat is a slot; a hook chamber is adjacent
to the slot; the volume of the hook chamber is slightly larger than
that of the hook body; the hook chamber has two transversal hook
blocks; a center of the hole seat is a channel hole; a channel hole
penetrates through the needle body so as to communicate to the needle
tube; and a top of the push rod has a hook body; a hook body has
two wedge buckles which are formed as a two stage structure; thereby,
the syringe needle passes through the positioning hole of the syringe
connecting seat of the syringe cylinder; the guide hole in the hole
seat of the syringe needle is helpful to guide the injection liquid.
2. The retractable safety syringe cylinder as claim in claim 1
wherein there are at least two hook blocks in the hook chamber.
3. The retractable safety syringe cylinder as claim in claim 1
wherein a lower end of the cylinder body has a 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 retractable safety syringe cylinder as claim in claim 1
wherein the hole 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 the two wedge buckles are an upper wedge buckle and a lower
exhaust tube; the upper wedge buckle is slightly smaller than the
lower wedge buckle.
Safety syringe description
FIELD OF THE INVENTION
[0001] The present invention relates to medical devices, and particularly
to a retractable safety syringe cylinder which has a structure capable
of precisely hooking the syringe needle for retracting the syringe
easily so as to control the displacement of the syringe needle.
Thus, the waste from the syringe is controllable and the operation
is 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 use of the retractable safety syringe cylinder is
similar to the conventional injector, it can be operated by a simple
training.
[0004] 2. The retractable safety syringe cylinder is safe and retractable
so as not to hurt anybody.
[0005] 3. It is disposable after used once.
[0006] FIG. 7 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 bottom
of the slot 201 is inclined. A periphery of the needle has a ring
retained by the positioning groove 111.
[0007] 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. Since
the bottom of the slot 201 is inclined, after the hook body 301
of the push rod 3 is inserted. The syringe needle 2 is inclined
in the syringe cylinder 1 as shown in the FIG. 8 so as to prevent
from hurting anybody as it is deserted.
[0008] Although this retractable safety syringe cylinder has many
advantages, when the push rod 3 is pulled backwards, it often becomes
loose and thus the hook body 301 can not be inserted into the slot
201 so that it can not be processed conveniently.
SUMMARY OF THE INVENTION
[0009] Accordingly, the primary object of the present invention
is to provide a retractable safety syringe cylinder which has a
firm and security structure.
[0010] To achieve above objects, the present invention provides
a retractable safety syringe cylinder has a structure which precisely
hook the syringe needle for retracting the syringe in the syringe
cylinder for bending. A hole seat at a lower end of the syringe
needle is matched to a hook body at a top surface of a rod cap of
a push rod. After pushing injection liquid, the two are engaged
so as to control the displacement of the syringe needle. Thus, the
waste from the syringe is controllable and the operation is 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 is a partial structural view of the present invention.
[0015] FIG. 4 shows one embodiment of the present invention.
[0016] FIG. 5 is a structural cross section view of the present
invention.
[0017] FIG. 6 shows one embodiment of the present invention.
[0018] FIG. 7 is a structural schematic view of one prior art.
[0019] FIG. 8 is a partial structural schematic view of the prior
art.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0020] Referring to FIGS. 1 and 2 the retractable safety syringe
cylinder of the present invention is illustrated. The retractable
safety syringe cylinder includes a syringe cylinder 1 a syringe
needle 2 and a push rod 3.
[0021] The upper center of the syringe cylinder 1 has a syringe
connecting seat 11. The syringe connecting seat 11 has a positioning
hole 110. The lower end of the cylinder body 12 has a ring 121.
[0022] The upper end of the syringe needle 2 is a needle tube 22
and the lower end is a needle 21. A lower end of the needle 21 has
a hole seat 23. A lower end of the hole seat 23 is a slot 231. A
hook chamber 233 is adjacent to the slot 231. The hook chamber 233
has two transversal hook blocks 234. A center of the hole seat 23
is a channel hole 230. The channel hole 230 penetrates through the
needle body so as to communicate to the needle tube 22. The hole
seat 23 is installed with a guide hole 232 as shown in the FIG.
3.
[0023] A top of the push rod 3 is a rod cap 31. The rod cap 31
can be made of elastic material. A periphery of the rod cap 31 has
a positioning groove 312. A top center of the rod cap 31 has a hook
body 311. The hook body 311 has two wedge buckles 3111 and 3112
which are formed as two stages. The upper wedge buckles 3112 is
slightly smaller than the lower wedge buckle 3111. The rod body
32 has a through hole 320 as shown in the FIG. 2.
[0024] Thereby, the syringe needle 2 can pass through the positioning
hole 110 of the syringe connecting seat 11 of the syringe cylinder
1. The guide hole 232 in the hole seat 23 of the syringe needle
2 is helpful to guide the injection liquid.
[0025] Thereby, the inner side of the cylinder body 12 of the syringe
cylinder 1 has a ring 121 which can be engaged to the positioning
groove 312 installed at the rod cap 3 1 of the push rod 3 so as
to prevent the push rod 3 from trapping in the cylinder body 12
as the push rod 3 move outwards.
[0026] By above construction, the retractable 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. 4 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 21 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 rod cap 31 at the top of the push rod 3 exactly
resists against the hole seat 23 of the needle 21. Since the needle
21 has-the hole seat 23 the hook body 311 on the rod cap 31 exactly
inserts into the slot 231 to enter into the hook chamber 233 and
is buckled to the hook blocks 234 in the hook chamber 233 as shown
in the FIG. 5. When the push rod 3 moves back again, the syringe
needle 2 will retract from the syringe connecting seat II to be
within the cylinder body 12 as shown in the FIG. 6. When the hook
body 311 inserts into the hole seat 23 since the space of the hook
chamber 233 is slightly larger than the hook body 311. The hook
chamber 233 is loosely engaged to the wedge buckles 3111 and 3112.
The wedge buckle 3112 is confined by the hook block 234 and thus
can not retract out. Thus, although the syringe needle 2 can tilt
and shift, it can not separated from the cylinder body 12 and thus
is left therein. By installing the through hole 320 the rod body
32 can be broken easily. The operator will not be hurt.
[0027] Although the present invention has been described with reference
to the preferred embodiments, it will be understood that the invention
is not limited to the details described thereof. Various substitutions
and modifications have been suggested in the foregoing description,
and others will occur to those of ordinary skill in the art. Therefore,
all such substitutions and modifications are intended to be embraced
within the scope of the invention as defined in the appended claims.
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