Safety syringe abstract
A safety syringe includes two major components; a barrel and a
plunger; a needle hub engaged with the barrel and a plunger slid
ably received in the barrel to engage with the needle hub and to
retract the needle hub into the barrel. A V-shape groove formed
a thin membrane surround the needle hub. The V-shape groove separates
the needle hub and the barrel into two peripheries--an inner periphery
of the barrel and an outer periphery of the hub. The inner periphery
of the barrel and the outer periphery of the hub are thicker than
the thin membrane. Multiple pyramidal blocks extended from the outer
periphery of the hub facing outward to the barrel. Multiple triangular
cutouts with V-shape groove edge defined in the inner periphery
of the barrel respectively correspond to one of the multiple pyramidal
blocks.
Safety syringe claims
What is claimed is:
1. In a safety syringe having a barrel, a needle hub engaged with
the barrel and a plunger slidably received in the barrel to engage
with the needle hub so as to retract the needle hub into the barrel,
wherein the improvement comprises: a V-shape groove formed a thin
membrane surround the needle hub, the V-shape groove separates the
needle hub and the barrel into two peripheries--an inner periphery
of the barrel and an outer periphery of the hub, wherein the inner
periphery of the barrel is thicker than the thin membrane.
2. The safety syringe as claimed in claim 1 further comprising:
multiple pyramidal blocks extended from the outer periphery of the
hub facing outward to the barrel, multiple triangular cutouts with
V-shape groove edge defined in the inner periphery of the barrel
respectively correspond to one of the multiple pyramidal blocks.
3. The safety syringe as claimed in claim 2 wherein the triangular
cutouts edged with V-shape groove are filled with thin membrane.
4. The safety syringe as claimed in claim 1 further comprising
ribs extending from the outer periphery of the needle hub to respectively
correspond to one of the pyramidal blocks.
Safety syringe description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a safety syringe, and more
particularly to a safety syringe having two main components only;
the barrel and the plunger. It has a V-shape groove formed a thin
membrane between the needle hub and the barrel. The thin membrane
integrally formed between the inner periphery of the barrel and
the outer periphery of the needle hub and some multiple pyramidal
blocks extending from the needle hub periphery facing outward to
the barrel. Thus, when the needle hub is pulled backward into the
barrel by the plunger, the pyramidal blocks tear the thin membrane
to facilitate the retraction of the needle hub into the barrel.
[0003] 2. Description of Related Art
[0004] Numerous patents discussing different structures and means
of preventing accidental damage to medical personnel by used syringes
have already been introduced to the market. Reviewing the patents,
most of them concern the means of how the needle is retracted into
the barrel. However, in most of the information provided in the
available patents, after the syringe is used, the paramedics either
remove the needle from the needle hub to avoid accidental injury
to the others or dispose of the needle hub in a sterilizing processor
to prevent any infection by the injury via the needle.
[0005] Reviewing both approaches, either the person is quite easy
to be hurt by the needle or the managing cost raised by purchasing
the sterilizing or destructing processor.
[0006] To overcome the shortcomings, the present invention tends
to provide an improved safety syringe to mitigate and obviate, the
aforementioned problems.
SUMMARY OF THE INVENTION
[0007] The primary objective of the present invention is to provide
an improved safety syringe to allow the medical personnel to safely
retract the needle hub together with the needle in the barrel.
[0008] Another objective of the present invention is to provide
an improved safety syringe that has a thin membrane formed between
the barrel and the needle hub and multiple pyramidal blocks extended
from the hub periphery, with two-side V-shape groove edge formed
thin membrane. Therefore, when the needle hub is pulling backward
into the barrel by the plunger, the pyramidal blocks destroy the
thin membrane to allow the retraction of the needle hub into the
barrel and thus the user's safety is secured.
[0009] Other objects, advantages and novel features of the invention
will become more apparent from the following detailed description
when taken in conjunction with the accompanied drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 is a cross sectional view of barrel and a needle
hub of the present invention;
[0011] FIG. 2 is a partial perspective view of the needle hub and
the barrel;
[0012] FIG. 3 is a sides plan view of the needle hub and the barrel
in partial section showing a thin membrane is formed between the
inner periphery of the barrel and the outer periphery of the needle
hub;
[0013] FIG. 4 is a top plan view of the needle hub and the barrel;
[0014] FIG. 5 is a schematic view showing the engagement of the
plunger with the needle hub;
[0015] FIG. 6 is a schematic view showing that after the needle
hub is pulled back into the barrel by the plunger, the user is able
to break the linking rod of the plunger to retain the needle hub
in the barrel; and
[0016] FIG. 7 is a perspective view showing another embodiment
of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0017] With reference to FIG. 1 and FIG. 2 the safety syringe
in accordance with the present invention has a barrel (10) and a
needle hub (20). The needle hub (20) has a first seat (21) and a
second seat (22) integrally formed inside the first seat (21). A
central seat (23) is also formed inside the second seat (22) and
has a through hole (231) centrally defined in the central seat (23).
An inner periphery of the barrel (24) integrally extends from the
barrel (10). A thin membrane (25) is formed at the bottom of the
V-Shape groove around the outer periphery of the needle hub (20)
and connected to the inner periphery of the barrel (24).
[0018] With reference to FIG. 3 the inner periphery of the barrel
(24) is thicker than that of the thin membrane (25).
[0019] With reference to FIG. 4 the thin membrane (25) has multiple
pyramidal blocks (241) extended from the hub periphery formed on
atop surface of the thin membrane (25). Multiple triangular cutouts
(242) are formed on the inner periphery of the barrel (24) to correspond
to the multiple pyramidal blocks (241) and are V-shape grooved with
the thin membrane (25). Therefore, each of the pyramidal blocks
(241) is spaced away from the inner periphery of the barrel (10).
[0020] With reference to FIGS. 5 and 6 a plunger (30) is slidably
received in the barrel (10) from an opening (12) of the barrel (10)
and has a hooking tip (31) formed on the distal end of the plunger
(30), a linking rod (32) formed between a top portion and a bottom
portion of the plunger (30) and a plug (33) sandwiched between a
joint between the hooking tip (31) and the top portion of the plunger
(30).
[0021] After the plunger (30) is inserted into the barrel (10)
to inject the medicine received in the barrel (10), the user continues
to push the plunger (30) into the needle hub (20) to extend through
the through hole (231). Thus, the hooking tip (31) is able to securely
engage with a peripheral edge of the through hole (231). Thereafter,
the user retracts the plunger (30) and while pulling the plunger
(30) backward, due to the secured engagement between the plunger
(30) and the needle hub (20), the needle hub (20) is also driven
to move inside the barrel (10). However, when the needle hub (20)
is being driven to move inside the barrel (10), the pyramidal blocks
(241) tear the thin membrane (25) to completely separate the needle
hub (20) from the barrel (10), thus needle hub (20) will be retracted
into the barrel (10).
[0022] With reference to FIG. 7 another embodiment of the present
invention is shown, wherein the barrel (50) has a needle hub (40)
integrally formed with the barrel (50).
[0023] An inner periphery of the barrel (43) integrally extends
from the barrel (50). A V-shape groove formed a thin membrane (44)
around the outer periphery of the needle hub (40) and connected
to the inner periphery of the barrel (43).
[0024] With reference to FIG. 3 the inner periphery of the barrel
(43) is thicker than that of the thin membrane (44).
[0025] The thin membrane (44) has multiple pyramidal blocks (41)
extended from the hub periphery formed on atop surface of the thin
membrane (44). Triangular ribs (42) extend from the outer periphery
of the needle hub (40) and each triangular rib (42) corresponds
to one of the pyramidal blocks (41). Multiple triangular cutouts
(431) are formed on the inner periphery of the barrel (43) to correspond
to the multiple pyramidal blocks (41) and are V-shape grooved with
the thin membrane (44). Therefore, each of the pyramidal blocks
(41) is spaced away from the inner periphery of the barrel (50).
[0026] Therefore, when the needle hub (40) is pulled backward by
the plunger (not shown), the pyramidal blocks (41) tear the thin
membrane (44) to completely separate the needle hub (40) from the
barrel (50) to allow the needle hub (40) to be received in the barrel
(50).
[0027] It is to be understood, however, that even though numerous
characteristics and advantages of the present invention have been
set forth in the foregoing description, together with details of
the structure and function of the invention, the disclosure is illustrative
only, and changes may be made in detail, especially in matters of
shape, size and arrangement of parts within the principles of the
invention to the full extent indicated by the broad general meaning
of the terms in which the appended claims are expressed
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