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. A safety syringe having a barrel, a needle hub engaged with
said 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 comprise: a. a V-shaped groove formed at
a thin membrane surrounding the needle hub, wherein the V-shaped
groove separates the needle hub and the barrel into 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; b. a
plurality of pyramidal blocks extended from the outer periphery
of the hub facing outward to the barrel; and, c. a plurality of
triangular cutouts with a V-shaped groove edge defined in the inner
periphery of the barrel respectively corresponding to one of the
plurality of pyramidal blocks.
2. The safety syringe as claimed in claim 1 wherein the triangular
cutouts edged with the V-shaped groove filled with the thin membrane.
3. The safety syringe as claimed in claim 1 further comprising
a plurality of ribs extending from the outer periphery of the needle
hub to respectively correspond to one of the plurality of pyramidal
blocks.
4. 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. a V-shaped groove formed at
a thin membrane surrounding the needle hub, wherein the V-shaped
groove separates the needle hub and the barrel into an inner periphery
of the barrel and an outer periphery of the hub, the inner periphery
of the barrel is thicker than the thin membrane, and a plurality
of pyramidal blocks extend from the outer periphery of the facing
outward to the barrel; b. a plurality of ribs extending from the
outer periphery of the needle hub to respectively correspond to
one of the plurality of pyramidal blocks; and, c. a plurality of
triangular cutouts with a V-shaped groove edge defined in the inner
periphery of the barrel respectively corresponding to one of the
plurality of pyramidal blocks.
5. The safety syringe as recited in claim 4 wherein the plurality
of triangular cutouts edged with the V-shaped groove are filled
with the thin membrane.
Safety syringe description
BACKGROUND OF THE INVENTION
1. Field of the Invention
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.
2. Description of Related Art
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.
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.
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
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.
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.
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
FIG. 1 is a cross sectional view of barrel and a needle hub of
the present invention;
FIG. 2 is a partial perspective view of the needle hub and the
barrel;
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;
FIG. 4 is a top plan view of the needle hub and the barrel;
FIG. 5 is a schematic view showing the engagement of the plunger
with the needle hub;
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
FIG. 7 is a perspective view showing another embodiment of the
present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
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).
With reference to FIG. 3 the inner periphery of the barrel (24)
is thicker than that of the thin membrane (25).
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).
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).
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).
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).
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).
With reference to FIG. 3 the inner periphery of the barrel (43)
is thicker than that of the thin membrane (44).
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).
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).
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. |