Safety syringe abstract
An improved structure safety syringe comprised of a barrel having
two trapezoidal-shaped tabs, a sleeve with a guide slot and, furthermore,
limit slots extending from the circumferential surface at the two
ends of the guide slot and an insertion section is formed at the
inside end of the limit slot, wherein utilizing the engagement of
the tabs and the insertion section enables the positioning of the
barrel and the sleeve, and a plunger having a protective cap at
the force application end that can be broken off at an appropriate
time. When the protective cap is broken off and, furthermore, inserted
into the other end of the sleeve, the objective of positioning is
achieved and, furthermore, ensures that the hypodermic needle is
not exposed.
Safety syringe claims
What is claimed is:
1. An improved structure safety syringe, wherein the said syringe
consists of a barrel of a hollow cylindrical construction having
a plunger inserted in a plunger opening and, furthermore, a hypodermic
needle is installed at one end of the said barrel; a sleeve of a
hollow tubular construction having a sleeve opening inside is slipped
over the exterior section of the said barrel; a tab is disposed
near the said hypodermic needle on the two sides of the circumferential
surface of the said barrel; a guide slot is disposed lengthwise
along the walled face of the said sleeve; a limit slot extends from
along the circumferential surface at the two ends of the said guide
slot, with the guiding action of the said guide slots enabling a
retraction and extension movement by the said barrel and the said
sleeve and, furthermore, utilizing the said limit slot fixes the
position after the movement of the said barrel and the said sleeve;
and a protective cap proximal to the force application end of the
said plunger can be broken off at the appropriate time, enabling
the insertion of the broken off said protective cap into the other
end of the said sleeve, and the innovations are:
the said barrel has the said tab which is of a trapezoidal shape
with an insertion end formed at one extremity and a catch section
formed at the other extremity and, furthermore, the width of the
said catch section is larger than that of the said insertion end
and an angled leading surface is formed on two sides, with the said
angled leading surface gradually expanding outward in angle as it
proceeds from the said insertion end to the said catch end; a slanted
surface is formed on the top surface of the said tab and the said
slanted surface is aligned with lower side of the said hypodermic
needle,
the said sleeve, wherein an insertion section is formed at the
interior end of the said limit slot and a stop section projects
towards the said limit slot in each of the openings between the
said insertion sections and said limit slots and, furthermore, enabling
the width between the two said stop sections to be smaller than
the width of the said barrel catch end such that the said tab is
insertable between the said two stop sections and remains ensconced
in a fixed position in the said insertion sections and, furthermore,
a circular binding-type mounting ring is formed at the said insertion
section along the circumferential surface inside the other end of
the said sleeve,
the said plunger, the said protective cap of which has a groove
formed on the interior lateral surface of a press plate such that
when the said protective cap is broken off and inserted into the
other end of the said sleeve, the engagement of the said groove
and the said mounting ring enables the said protective cap to become
fixed in position.
2. As mentioned in claim 1 of the improved structure safety syringe
invention herein, a number of plunger elements are formed on the
said protective cap of the said plunger, of which a latch section
projects outward from one of the said elements, the said sleeve
has a catch slot of an appropriate length and, furthermore, is open
in a single direction as formed in the circumferential surface at
one end of the said mounting ring such that when the said protective
cap is broken and, furthermore, inserted into the other end of the
said sleeve, the said latch section is engaged in the said catch
slot, thereby enabling the positioning of the said protective cap.
3. As mentioned in claim 1 of the improved structure safety syringe
invention herein, the said protective cap is fabricated as a hollow
tubular construct and, furthermore, has an insertion hole formed
inside, with a number of latch rings disposed along the inner side
of the circumferential surface of a groove; the said latch rings
are aligned with a press plate having a larger diameter and, furthermore,
the diameter of the said latch rings gradually decrease as they
extend inward and a guide surface is formed around the circumference;
when the said protective cap is broken and, furthermore, to be inserted
in the other end of the said sleeve, forcing the said latch rings
against the said mounting ring causes the said mounting ring to
become ensconced in the said groove and the said hypodermic needle
to become ensheathed in the said insertion hole, thereby enabling
the positioning of the said protective cap.
4. As mentioned in claim 1 of the improved structure safety syringe
invention herein, the said protective cap is fabricated as a hollow
tubular construct and, furthermore, has an insertion hole formed
within the interior section as well as a tube formed inside the
groove; a number of ribs are disposed lengthwise along the outer
periphery of the said tube, a number of latch serrations are formed
on the said ribs and, furthermore, the said latch serrations nearest
the said press plate are of greater height and the height of the
said latch serrations gradually decrease as they proceed inward,
such that when the said protective cap is broken and, furthermore,
about to be inserted into the other end of the said sleeve, forcing
the said latch serrations against the said mounting ring causes
the said mounting ring to become ensconced in the said groove and
the said hypodermic needle to become ensheathed in the said insertion
hole, thereby enabling the positioning of the said protective cap.
5. As mentioned in claim 1 of the improved structure safety syringe
invention herein, an angled leading surface aligned with the said
guide slot is formed on the interior annular surface at one end
of the said sleeve opening of the said sleeve and, furthermore,
enabling the said angled leading surface to gradually increase outward
in angle.
Safety syringe description
BACKGROUND OF THE INVENTION
1) Field of the Invention
The invention herein relates to an improved structure safety syringe
that is simple, easy to operate, and offers a high degree of utilization
safety.
2) Description of the Prior Art
Since AIDS, hepatitis type A, and hepatitis type B are transmitted
by the re-use of hypodermic needles, the use of disposable needles
is the basic safeguard in preventing the spread of such communicable
diseases.
While the use of disposable hypodermic needles ensures the safety
of the persons receiving injections, medical treatment personnel
face substantial risks, especially after administering injections
to patients. When a hypodermic needle is placed back into its cover,
a self-inflicted puncture can easily occur due to accidental impact
or carelessness. To minimize such hazardous situations, a safer
type of syringe has now been successfully developed (new patent
application No. 86214720). As indicated in FIG. 1 the said syringe
is comprised of a barrel 1 a sleeve 2 and a plunger 3; the said
barrel 1 is of a hollow cylindrical construction and has a hypodermic
needle 4 installed at one end and a one-way plunger opening 101
at the other end; a short round tab 102 is disposed on the circumferential
surfaces at the two sides of the barrel 1 near the hypodermic needle
4; two guide slots 201 are formed lengthwise along the walled surface
of the said sleeve 2 a limit slot 202 extends from the circumferential
surface at the two ends of the said guide slots 201 and, furthermore,
the limit slots 202 and the guide slots 201 merge perpendicularly,
and a sleeve opening 203 is formed inside the sleeve 2 and, furthermore,
a notch 204 that extends up to the limit slot 202 is formed along
the annular surface of the sleeve opening 203 of the sleeve 2; as
such, when the barrel 1 is inserted into the sleeve opening 203
of the sleeve 2 the tab 102 situated along the notch 204 is inserted
into the guide slot 201; furthermore, after the injection is administered,
the operator pulls the sleeve 2 over the barrel 1 and, furthermore,
with the tab 102 now positioned at one end of the guide slot 201
rotates it an appropriate number of degrees, causing the tab 102
to move into the limit slot 202 thereby preventing the separation
of the sleeve 2 and the barrel 1 and, furthermore, causes the hypodermic
needle 4 to be housed within the sleeve 2 to achieve the objective
of safety.
However, when the tab 102 is moved into the limit slot 202 the
limit slot 202 does not provide any effective positional latching
such that the sleeve 2 is easily rotated over the barrel 1 in the
opposite direction for an appropriate number of degrees and, therefore,
the sleeve 2 may slip back and, furthermore; cause the hazardous
exposure of the hypodermic needle 4.
Additionally, since the sleeve 2 is constructed of a plastic material,
it readily deforms when subjected to squeezing, at which time the
hypodermic needle 4 may protrude out of the guide slot 201 resulting
in the hazardous infliction of a puncture wound.
In view of the said situation, the inventor of the invention herein
devoted extensive thought to the matter and, furthermore, conducted
many years of research, development, and testing which culminated
in the successful completion of the present invention.
SUMMARY OF THE INVENTION
The primary objective of the invention herein is to provide an
improved structure safety syringe in which the sleeve can be pulled
and, furthermore, cover the hypodermic needle by enabling the barrel
and the sleeve to become latched into position and thereby achieve
the objective of utilization safety.
Another objective of the invention herein is to provide an improved
structure safety syringe in which after the plunger is utilized,
the protective cap is broken off at the force application end and,
furthermore, inserted into the end of the sleeve and then positionally
latched to the sleeve, thereby further preventing the hypodermic
needle from becoming exposed.
Therefore, based on the improved structure safety syringe provided
by the invention herein, the said syringe has a plunger that is
inserted into the plunger opening of the barrel and, furthermore,
a hypodermic needle is installed at one end and a hollow tubular
sleeve is fitted over the exterior section of the barrel; wherein,
a tab is disposed near the hypodermic needle on the two sides of
the circumferential surface of the barrel, with the said tab being
of a trapezoidal shape having an insertion end formed at one end
and a catch section formed at the other end and, furthermore, an
angled leading surface is formed on two sides, with the said angled
leading surface gradually expanding outward in angle as it proceeds
from the insertion end to the catch end; a slanted surface is formed
on the top surface of the tab and the said slanted surface is aligned
with lower side of the hypodermic needle; the said sleeve is of
a hollow tubular construction having a sleeve opening inside, a
binding-type mounting ring is formed at one end of the sleeve opening
and furthermore, two guide slots are disposed lengthwise along the
walled face of the sleeve and a limit slot extends from along the
circumferential surface at the two ends of the said guide slot,
wherein an insertion section is formed at the inner ends of the
limit slot, and a stop section projects towards the limit slot in
each of the openings between the said insertion sections and limit
and, furthermore, enabling the width between the two stop sections
to be smaller than the width of the barrel catch end such that the
said tab 13 is insertable between the two stop sections and remains
inserted in a fixed position in the said insertion sections; there
is a protective cap capable of being broken off at an appropriate
time proximal to the force application end of the said plunger and
a groove is formed at the inner side of the press plate of the said
protective cap such that when the protective cap is broken and,
furthermore, inserted into the end of the sleeve having the mounting
ring, the said groove become engaged onto the mounting ring of the
sleeve, thereby achieving the objective of positioning of the protective
cap.
The technology, methods, and functions utilized by the invention
herein are presented in the brief description of the drawings below
followed by the detailed description of the preferred embodiments
to enable a further understanding of the objectives, structure,
and innovations of the invention herein.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded drawing of a conventional syringe needle
tube.
FIG. 2 is an exploded drawing of the preferred embodiment of the
invention herein.
FIG. 3 is a cross-sectional drawing of the said preferred embodiment
of the invention herein in the utilization state.
FIG. 4 is a cross-sectional drawing of the said preferred embodiment
of the invention herein in the post-utilization state.
FIG. 5 is a drawing of the tab and insertion section of the insertion
sleeve.
FIG. 6 is a cross-sectional drawing of the positioned protective
cap of the said preferred embodiment of the invention herein.
FIG. 7 is a cross-sectional drawing of the positioned protective
cap of the said preferred embodiment of the invention herein as
viewed from the end.
FIG. 8 is an exploded drawing of the second preferred embodiment
of the invention herein.
FIG. 9 is a cross-sectional drawing of the second preferred embodiment
of the invention herein in the utilization state.
FIG. 10 is a cross-sectional drawing of the positioned protective
cap of the second preferred embodiment of the invention herein.
FIG. 11 is an exploded drawing of the third preferred embodiment
of the invention herein.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIG. 2 and FIG. 3 the improved structure safety syringe
of the invention herein is comprised of a barrel 10 a plunger 20
and a sleeve 30 of which:
The said barrel 10 is of a hollow cylindrical construction having
a one-way plunger opening 11 through the interior section and a
hypodermic needle 12 attached to the sealed exterior section of
the end; a tab 13 is disposed near the hypodermic needle 12 on one
side of the circumferential surface of the barrel 10 with the said
tab 13 being of a trapezoidal shape and having an insertion end
131 formed at one extremity and a catch section
132 formed at the other end and, furthermore, the width of the
catch section 132 is larger than that of the insertion end 131 and
an angled leading surface 133 is formed on two sides, with the said
angled leading surface 133 gradually expanding outward in angle
as it proceeds from the insertion end 131 to the catch end 132;
a slanted surface 134 is formed on the top surface of the tab 13
and the said slanted surface 134 is aligned with lower side of the
hypodermic needle 12.
The said plunger 20 is inserted into the plunger opening 11 of
the barrel 10 and the plunger member 21 consists of four plunger
elements 211 radiating diametrically in a perpendicular arrangement
and, furthermore, causing it to be sectionally cross-shaped; notches
22 are formed at the approximate rear extent of the plunger member
21 with the notches 22 constituting the breakable area of the plunger
member 21; and a protective cap 23 is formed behind the breakable
area; the said protective cap 23 consists of a press plate 231 having
a groove 232 formed on its interior lateral surface and the perpendicularly
configured four plunger elements 211 proceeding lengthwise from
the interior side of the groove 232 wherein a latch section 234
projects outward at the rear of the press plate 231 a beveled surface
235 of a gradually reduced circumference is formed on the outer
side of the groove 232 and a rubber sleeve 24 is positioned at
the front end of the said plunger 20.
The said sleeve 30 is of a hollow tubular construction having a
sleeve opening 31 inside, a binding-type mounting ring 32 is formed
at one end of the sleeve opening 31 and an angled leading surface
321 is formed on the exterior lateral surface of the said mounting
ring 32 and, furthermore, a guide slot 33 is disposed lengthwise
along the walled face of the sleeve 30 and a limit slot 34 extends
along the circumferential surface at the two ends of the said guide
slot 33 wherein an insertion section 35 aligned with the tab 13
is formed at the interior ends of the said guide slot 33 a triangular-shaped
stop section 351 projects towards the limit slot 34 in each of the
openings between the said insertion sections 35 and the limit slots
34 and, furthermore, enabling the width between the two stop sections
351 to be smaller than the width of the barrel 10 catch end 132
such that the said tab 13 as insertable between the two stop sections
351 and remains inserted in a fixed position in the said insertion
sections 35; additionally, an angled leading surface 36 aligned
with the said guide slot 33 is formed on the interior annular surface
at one end of the sleeve opening 31 of the said sleeve 30 and, furthermore,
enabling the said angled leading surface 36 to gradually increase
outwardly in angle, and a catch slot 37 of an appropriate length
and, furthermore, open in a single direction is formed in the circumferential
surface at one end of the mounting ring 32 such that when the mounting
ring 32 on the sleeve 30 is over the protective cap 23 as it is
broken, the said latch section 234 is engaged into the catch slot
37 thereby enabling positioning over the protective cap 23 and,
furthermore, without giving rise to rotation by the sleeve 30.
Having described the structural components and their relative locations
of the improved structure safety syringe of the invention herein,
the functions achievable by the present invention are elaborated
as follows:
As indicated in FIG. 3 when the fabrication of all the structural
components are completed and, furthermore, assembly is conducted,
the tab 13 is aligned with the angled leading surface 36 and, furthermore,
to enable the placement of the mounting ring 32 at one end of the
sleeve 30 sleeve opening 31 over the end of the barrel 10 having
the hypodermic needle 12 the slanted surface 134 formed on the
top surface of the tab 13 and the angled leading surface 36 serve
as a means of guidance, thereby enabling the tab 13 to readily enter
the sleeve opening 31 and finally become inserted in the guide slot
33 and, furthermore, the rubber piston 24 at one end of the plunger
20 is inserted into the plunger opening 11 of the barrel 10; at
this stage, the plunger 20 can be pulled and pushed along the plunger
opening 11 to achieve injection and the blood aspiration capability.
Referring to FIG. 4 and FIG. 5 when use of the syringe is completed
and, furthermore, the unit is to be discarded, the operating personnel
rotates the sleeve 30 an appropriate number of degrees over the
barrel 10 causing the movement of the tab 13 to the limit slot
34 at one side of the guide slot 33 at which time the sleeve 30
is then pulled outwards and, utilizing guiding action of the tab
13 and the guide slot 33 the tab 13 is moved to the other end of
the guide slot 33 at which time, the sleeve 30 is then rotated
an appropriate number of degrees, causing the insertion end 131
of the tab 13 to become engaged between the two stop sections 351
and, furthermore, utilizing the guiding action of the angled leading
surface 133 and the material properties of the sleeve 30 itself,
the tab 13 readily becomes ensconced in the insertion section 35
and, furthermore, utilizing the stop section 351 and the catch section
132 in coordination prevents the sleeve 30 from readily rotating
over the barrel 10 thereby ensuring that the hypodermic needle
12 will not become hazardously exposed.
Referring to FIG. 6 and FIG. 7 to further increase the level of
safety, with the protective cap 23 extending from the exterior section
of plunger opening 11 the operating personnel can break it off
at the notches 22 to produce a protective cap 23 and, furthermore,
after the latch section 234 of the protective cap 23 is aligned
with the catch slot 37 of the sleeve 30 it is pressed into the
front end of the sleeve 30 and, furthermore, causes the mounting
ring 32 to become engaged in the groove 232 and the latch section
234 to become inserted into position in the catch slot 37 thereby
sealing the front end of the sleeve 30 while ensuring that the
said protective cap 23 and the sleeve 30 are incapable of rotation
and the hypodermic needle 12 remains in a fixed position at the
junction of the plunger elements 233 and, furthermore, the hypodermic
needle 12 cannot be moved or protrude from the guide slot 33 by
rotating the protective cap 23 to thereby achieve a superior protective
function.
Therefore, the sleeve 30 is already installed on the barrel 10
when the fabrication of the invention herein is completed, with
the guidance furnished by slanted surface 134 of the tab 13 facilitating
the objective of simple assembly; additionally, following injection
or blood aspiration, it is only necessary to the rotate the barrel
10 and the sleeve 30 pull outward, and then rotate once again to
reach the safe position, wherein the hypodermic needle 12 is covered
and, furthermore, the protective cap 23 of the plunger 20 seals
the front end of the sleeve 30 which also prevents hypodermic needle
12 protrusion from the guide groove 33 such that the overall structure
is not only economical and capable of greater safety, but also has
practical value in terms of production.
Referring to FIG. 8 and FIG. 9 in the second preferred embodiment
of the invention herein, the said protective cap 23' is fabricated
as a hollow tubular construct and, furthermore, has an insertion
hole 236' formed inside, with a number of latch rings 237' disposed
along its interior side of the circumferential surface of the groove
232'; the said latch rings 237' are aligned with a press plate 231'
having a larger diameter and, furthermore, the diameter of the latch
rings 237' gradually decrease as they extend inward and a guide
surface 238' is formed around the circumference; as indicated in
FIG. 10 when the protective cap 23' is broken and, furthermore,
to be inserted into the other end of the sleeve 30', since the connection
point of the protective cap 23' and the plunger elements 21' is
only that of the tubular wall thickness, breaking it is relatively
easy; forcing the said latch rings 237' against the mounting ring
32' causes the mounting ring 32' to become ensconced in the groove
232' and the hypodermic needle 12' to become ensheathed into the
insertion hole 236' and, as such, this structure is not only capable
of positioning the protective cap 23', but also the protective cap
23' houses the hypodermic needle 12' and keeps it from becoming
exposed.
Referring to FIG. 11 the said protective cap 23" is fabricated
as a hollow tubular construct and, furthermore, has an insertion
hole 236" formed within the interior section as well as a tube
239" formed inside the groove 232"; the connection point
of the tube 239" and the plunger elements 211" is only
that of the tubular wall thickness of the tube 239"; a number
of ribs 237" are disposed lengthwise along the outer periphery
of the said tube 239", a number of latch serrations 238"
are formed on the said ribs 237" and, furthermore, the latch
serrations 238" nearest the press plate 231" are of greater
height, with the height of the latch serrations 238" gradually
decreasing as they proceed inward, such that when the protective
cap 23" is broken and, furthermore, about to be inserted into
the other end of the sleeve 30", forcing the said latch serrations
238" against the mounting ring 32" causes the mounting
ring 32" to become ensconced in the groove 232" and the
hypodermic needle 12" become ensheathed into the insertion
hole 236" and, as such, the said structure is not only capable
of positioning the protective cap 23", but the protective cap
23" also houses the hypodermic needle 12" and keeps it
from becoming exposed.
In summation of the foregoing section, since the invention herein
is more progressive and practical than products in the same category
and an investigation of the domestic and foreign technological materials
and documents relating to such structures revealed no existent equivalent
structure prior to its disclosure, the present invention meets the
requirements of original patent applications and is hereby submitted
for review and the granting of the commensurate patent rights.
However, the preceding description only relates to the preferred
embodiments that are cited as workable examples of the present invention
and, therefore, all modifications and adaptations based on the structure
disclosed in the detailed description of the preferred embodiments
and the claims thereof shall remain within the scope and claims
of the invention herein. |