Abstrict A disposable syringe includes a hollow barrel, an annular outer
neck and inner neck mounted on the top of the hollow barrel respectively,
a first cavity contained in the inner neck and having two opposite
abutting edges, a needle located in the inner neck and having a
lower end secured in the top of the hollow barrel and an upper end
projecting from the inner neck, a rotary cap rotatably mounted on
the outer neck and containing a second cavity aligning with the
first cavity, a guide slot contained in the top of the rotary cap
to receive the needle therein and connecting to the first cavity,
and a drive knob pivotally received in the second cavity and having
a first end portion containing a needle hole to receive the needle
therein, a mediate portion abutting one of the two abutting edges
of the first cavity, and a second end portion secured to the rotary
cap to rotate therewith.
Claims What is claimed is:
1. A disposable syringe comprising:
a hollow barrel (10);
an annular outer neck (11) mounted on the top of said hollow barrel
(10);
an annular inner neck (13) mounted on the top of said hollow barrel
(10), and located in said outer neck (11), a first cavity (14) transversely
contained in said inner neck (13) and having two opposite abutting
edges (140);
a needle (16) located in said inner neck (13) and having a lower
end secured in the top of said hollow barrel (10) and an upper end
extending outward from said inner neck (13);
a cylindrical rotary cap (20) rotatably mounted on said outer neck
(11) and containing a second cavity (27) transversely defined therein
and aligning with said first cavity (14), an elongated guide slot
(26) contained in the top of said rotary cap (20) to receive said
needle (16) therein and connecting to said first cavity (14); and
a drive knob (30) pivotally received in said second cavity (27)
and having a first end portion containing a needle hole (33) to
receive said needle (16) therein, a mediate portion abutting one
of said two abutting edges (140) of said first cavity (14), and
a second end portion secured to said rotary cap (20) to rotate therewith.
2. The disposable syringe in accordance with claim 1 further comprising
an annular guide groove (18) defined between said inner neck (13)
and said outer neck (11) and connecting to said first cavity (14).
3. The disposable syringe in accordance with claim 1 wherein said
outer neck (11) includes a plurality of locking rings (12) formed
on the periphery thereof, and said rotary cap (20) includes a plurality
of an annular locking grooves (21) each contained in the inner wall
thereof and each receiving one of said corresponding locking rings
(12) therein.
4. The disposable syringe in accordance with claim 1 further comprising
a positioning column (15) secured on the top of said barrel (10)
and located in said inner neck (13), wherein said needle (16) is
secured to said positioning column (15) at the lower end portion
thereof.
5. The disposable syringe in accordance with claim 1 wherein said
rotary cap (20) includes a retaining lug (24) extending outward
from the top thereof and containing an opening (25) connecting to
said guide slot (26) to receive said needle (16) therein.
6. The disposable syringe in accordance with claim 5 wherein said
drive knob (30) includes a retaining stub (32) formed on the first
end portion thereof and detachably received in said opening (25).
7. The disposable syringe in accordance with claim 5 further comprising
an elongated cover (35) detachably mounted on said retaining lug
(24) to receive said needle (16) therein.
8. The disposable syringe in accordance with claim 1 wherein said
drive knob (30) includes a protrusion (31) projecting from the second
end portion thereof and received in said second cavity (27), and
a retaining piece (310) extending from said protrusion (31) and
abutting the top of said rotary cap (20).
9. The disposable syringe in accordance with claim 1 wherein said
rotary cap (20) includes an annular flange (22) extending downward
from the bottom thereof and located between said inner neck (13)
and said outer neck (11), and an opening (23) transversely contained
in said annular flange (22) and connecting to said second cavity
(27) to receive said first end portion of said drive knob (30) therein.
10. The disposable syringe in accordance with claim 9 wherein
said opening (23) includes two opposite abutting edges (230), and
said first end portion of said drive knob (30) abuts one of said
two abutting edges (230) of said opening (23) to move therewith.
Description CROSS-REFERENCES TO RELATED APPLICATIONS
Not Applicable.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a safe disposable syringe.
2. Description of the Related Art
A conventional disposable syringe comprises a hollow barrel, and
a needle detachably attached to the hollow barrel. The needle needs
to be separated from the hollow barrel to dispose of the disposable
syringe. However, the needle projecting outward from the hollow
barrel tends to puncture the operator during the disposal process.
The present invention has arisen to mitigate and/or obviate the
disadvantage of the conventional disposable syringe.
BRIEF SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is
provided a disposable syringe comprising: a hollow barrel; an annular
outer neck mounted on the top of the hollow barrel; an annular inner
neck mounted on the top of the hollow barrel, and located in the
outer neck, a first cavity transversely contained in the inner neck
and having two opposite abutting edges; a needle located in the
inner neck and having a lower end secured in the top of the hollow
barrel and an upper end projecting from the inner neck; a cylindrical
rotary cap rotatably mounted on the outer neck and containing a
second cavity transversely defined therein and aligning with the
first cavity, an elongated guide slot contained in the top of the
rotary cap to receive the needle therein and connecting to the first
cavity; and a drive knob pivotally received in the second cavity
and having a first end portion containing a needle hole to receive
the needle therein, a mediate portion abutting one of the two abutting
edges of the first cavity, and a second end portion secured to the
rotary cap to rotate therewith.
The rotary cap includes an annular flange extending downward from
the bottom thereof and located between the inner neck and the outer
neck, and an opening transversely contained in the annular flange
and connecting to the second cavity to receive the first end portion
of the drive knob therein. The opening includes two opposite abutting
edges, and the first end portion of the drive knob abuts one of
the two abutting edges of the opening to move therewith.
Further benefits and advantages of the present invention will become
apparent after a careful reading of the detailed description with
appropriate reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
FIG. 1 is a perspective view of a safe disposable syringe in accordance
with the present invention;
FIG. 2 is an exploded perspective view of the safe disposable syringe
as shown in FIG. 1;
FIG. 3 is a front plan cross-sectional view of the safe disposable
syringe as shown in FIG. 1;
FIG. 4 is a top plan cross-sectional view of the safe disposable
syringe as shown in FIG. 1;
FIG. 5 is an operational view of the safe disposable syringe as
shown in FIG. 4; and
FIG. 6 is a perspective view in partial section of the safe disposable
syringe, wherein the needle is retracted into the rotary cap.
DETAILED DESCRIPTION OF THE INVENTION
Referring now to the drawings and initially to FIGS. 1-4 a safe
disposable syringe in accordance with the present invention comprises
a hollow barrel (10), an annular outer neck (11) mounted on the
top of the hollow barrel (10), an annular inner neck (13) mounted
on the top of the hollow barrel (10), and located in the outer neck
(11), a first cavity (14) transversely contained in the inner neck
(13) and having two opposite abutting edges (140), an annular guide
groove (18) defined between the inner neck (13) and the outer neck
(11) and connecting to the first cavity (14), a positioning column
(15) secured on the top of the barrel (10) and located in the inner
neck (13), a needle (16) located in the inner neck (13) and having
a lower end secured to the positioning column (15) and an upper
end projecting from the inner neck (13), a cylindrical rotary cap
(20) rotatably mounted on the outer neck (11) and containing a second
cavity (27) transversely defined therein and aligning with the first
cavity (14), a elongated guide slot (26) contained in the top of
the rotary cap (20) to receive the needle (16) therein and connecting
to the first cavity (14), and a drive knob (30) pivotally received
in the second cavity (27) and having a first end portion containing
a needle hole (33) to receive the needle (16) therein, a mediate
portion abutting one of the two abutting edges (140) of the first
cavity (14), and a second end portion secured to the rotary cap
(20) and abutting the wall of the second cavity (27) to rotate therewith.
The outer neck (11) includes a plurality of locking rings (12)
formed on the periphery thereof, and the rotary cap (20) includes
a plurality of an annular locking grooves (21) each contained in
the inner wall thereof and each receiving one of the corresponding
locking rings (12) therein, thereby detachably mounting the rotary
cap (20) on the outer neck (11).
The rotary cap (20) includes a retaining lug (24) extending outward
from the top thereof and containing an opening (25) connecting to
the guide slot (26) to receive the needle (16) therein. The disposable
syringe comprises an elongated cover (35) detachably mounted on
the retaining lug (24) to receive the needle (16) therein.
The drive knob (30) further includes a retaining stub (32) formed
on the first end portion thereof and detachably received in the
opening (25), a protrusion (31) extending outward from the second
end portion thereof and received in the second cavity (27), and
a retaining piece (310) extending from the protrusion (31) and abutting
the top of the rotary cap (20).
The rotary cap (20) includes an annular flange (22) extending downward
from the bottom thereof and located between the inner neck (13)
and the outer neck (11), and an opening (23) transversely contained
in the annular flange (22) and connecting to the second cavity (27)
to receive the first end portion of the drive knob (30) therein.
The opening (23) includes two opposite abutting edges (230), and
the first end portion of the drive knob (30) abuts one of the two
abutting edges (230) of the opening (23) to move therewith.
In operation, referring to FIGS. 4-6 with reference to FIGS. 1-3
when the intent is to dispose of the safe disposable syringe after
it is used, the rotary cap (20) is rotated relative to the outer
neck (11) in the direction as indicated by the arrow on top of the
cap shown in FIG. 1 thereby pressing the first end portion of the
drive knob (30) so as to synchronously move with the rotary cap
(20).
At the same time, the mediate portion of the drive knob (30) is
fixed by the abutting edge (140) of the first cavity (14) of the
inner neck (13) which is fixed during the movement of the first
end portion of the drive knob (30) such that the drive knob (30)
is pivoted relative to the abutting edge (140) from the position
as shown in FIG. 4 to the position as shown in FIG. 5 thereby deviating
the upper end of the needle (16) through the guide slot (26) by
means of the needle hole (33) of the retaining stub (32) of the
second end portion of the drive knob (30) to the position as shown
in FIG. 5 so as to guide the upper end of the needle (16) into
the guide groove (18) such that the upper end of the needle (16)
can be wound around the outer wall of the inner neck (13).
The rotary cap (20) is continuously rotated relative to the outer
neck (11) such that the needle (16) can be wound around the outer
wall of the inner neck (13) as shown in FIG. 6 and securely received
in the guide groove (18), thereby retracting the needle (16) into
the rotary cap (20). In such a manner, the needle (16) is entirely
retracted into the rotary cap (20) when the intent is to dispose
of the disposable syringe, thereby preventing the needle (16) from
puncturing the operator during the disposal process.
It should be clear to those skilled in the art that further embodiments
may be made without departing from the scope and spirit of the present
invention. |