U.S. patent application number 15/901474 was filed with the patent office on 2018-06-28 for syringe with needle.
This patent application is currently assigned to TERUMO KABUSHIKI KAISHA. The applicant listed for this patent is TERUMO KABUSHIKI KAISHA. Invention is credited to Kozo MATSUMOTO, Masafumi TAKEMOTO.
Application Number | 20180178423 15/901474 |
Document ID | / |
Family ID | 45892984 |
Filed Date | 2018-06-28 |
United States Patent
Application |
20180178423 |
Kind Code |
A1 |
TAKEMOTO; Masafumi ; et
al. |
June 28, 2018 |
SYRINGE WITH NEEDLE
Abstract
A syringe and needle assembly including a needle tube having a
needle tip for puncturing a living body. A syringe is formed
integrally with the needle tube. The syringe includes a main body
to be filled with a drug and a securing section that is formed
integrally with the main body. The securing section has a close
contact area that has an outer peripheral surface that contacts an
inner surface of a cap when the cap is attached, and a connection
area that connects the close contact area and the main body to each
other. A needle tip of the needle tube protrudes from the close
contact area, and a parting line is formed on the securing section.
The outer peripheral surface of the close contact area has no
parting lines.
Inventors: |
TAKEMOTO; Masafumi;
(Shizuoka, JP) ; MATSUMOTO; Kozo; (Yamanashi,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
TERUMO KABUSHIKI KAISHA |
Tokyo |
|
JP |
|
|
Assignee: |
TERUMO KABUSHIKI KAISHA
Tokyo
JP
|
Family ID: |
45892984 |
Appl. No.: |
15/901474 |
Filed: |
February 21, 2018 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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15162790 |
May 24, 2016 |
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15901474 |
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13814788 |
Feb 7, 2013 |
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PCT/JP2011/072040 |
Sep 27, 2011 |
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15162790 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A61M 5/34 20130101; B29K
2101/12 20130101; B29C 45/14065 20130101; A61M 5/3202 20130101;
B29K 2705/02 20130101; B29K 2705/08 20130101; B29K 2705/12
20130101; A61M 5/343 20130101; A61M 2207/00 20130101; B29L
2031/7544 20130101 |
International
Class: |
B29C 45/14 20060101
B29C045/14; A61M 5/34 20060101 A61M005/34 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 29, 2010 |
JP |
2010-218300 |
Claims
1.-10. (canceled)
11. A syringe and needle assembly, comprising: a needle tube having
a needle tip configured to puncture a living body; and a syringe
formed integrally with the needle tube, the syringe including a
main body configured to be filled with a drug and a securing
section that is formed integrally with the main body, the securing
section having a close contact area that has an outer peripheral
surface, which is configured to contact an inner surface of a cap
when the cap is attached, and a connection area, wherein the
connection area connects the close contact area and the main body
to each other, wherein a needle tip of the needle tube protrudes
from the close contact area, and wherein a parting line is formed
on the securing section and the outer peripheral surface of the
close contact area has no parting lines thereon.
12. The syringe and needle assembly according to claim 11, wherein
the parting line is located at an interface between the close
contact area and the connection area.
13. The syringe and needle assembly according to claim 11, wherein
the connection area includes a reduced diameter portion that has a
smaller diameter than a diameter of the close contact area.
14. The syringe and needle assembly according to claim 11, wherein
an outer surface of the reduced diameter portion extends transverse
to a longitudinal axis of the needle.
15. The syringe and needle assembly according to claim 11, wherein
the parting line is located between the close contact area and the
connection area.
16. The syringe and needle assembly according to claim 11, further
comprising: the cap being attached to the syringe and needle
assembly, wherein the inner surface of the cap contacts the outer
peripheral surface of the close contact area.
17. An insert molded syringe and needle assembly, comprising: a
needle tube having a needle tip configured to puncture a living
body; and a syringe formed integrally with the needle tube by
insert molding, the syringe including a main body configured to be
filled with a drug and a securing section that is formed integrally
with the main body, the securing section having a close contact
area that has an outer peripheral surface, which is configured to
contact an inner surface of a cap when the cap is attached, and a
connection area, wherein the connection area connects the close
contact area and the main body to each other, wherein a needle tip
of the needle tube protrudes from the close contact area, and
wherein a parting line, resulting from formation of the syringe and
needle assembly within the mold, is formed on the securing part
such that the outer peripheral surface of the close contact area
has no parting lines thereon.
18. The syringe and needle assembly according to claim 17, wherein
the parting line is located at an interface between the close
contact area and the connection area.
19. The syringe and needle assembly according to claim 17, wherein
the connection area includes a reduced diameter portion that has a
smaller diameter than a diameter of the close contact area.
20. The insert molded syringe and needle according to claim 17,
wherein an outer surface of the reduced diameter portion extends
transverse to a longitudinal axis of the needle.
21. The insert molded syringe and needle according to claim 17,
wherein the parting line is located between the close contact area
and the connection area.
22. The insert molded syringe and needle according to claim 17,
further comprising: the cap being attached to the syringe and
needle assembly, wherein the inner surface of the cap contacts the
outer peripheral surface of the close contact area.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This is a continuation of pending U.S. patent application
Ser. No. 15/162,790, which is a continuation application of U.S.
patent application Ser. No. 13/814,788, filed on Feb. 7, 2013,
which is a U.S. National Stage Application of International
Application No. PCT/JP2011/072040, filed Sep. 27, 2011, which
claims priority to Japanese Application No. 2010-218300, filed Sep.
29, 2010. The disclosures of these documents, including the
specifications, drawings and claims, are incorporated herein by
reference in their entirety.
TECHNICAL FIELD
[0002] The present invention relates to a syringe with needle such
that a syringe is formed on a needle tube by insert molding.
BACKGROUND ART
[0003] In general, a syringe with needle includes a needle tube
which is provided at a distal portion thereof with a needle tip
capable of puncturing a living body, and a needle hub which holds
the needle tube in a state of protruding the needle tip of the
needle tube. In addition, the syringe with needle is configured by
connecting a syringe to the needle hub. It is an existing practice
to secure the needle tube to the needle hub by use of an adhesive
in the condition where the needle tube is inserted and passed in an
insertion hole of the needle hub (see, for example, Patent Document
1).
[0004] In recent years, there has been proposed a syringe with
needle wherein a needle hub is omitted and a needle tube is secured
directly to a syringe which is to be filled with a drug. In this
syringe with needle, also, the needle tube is secured to the
syringe by use of an adhesive, like in the existing syringe with
needle.
PRIOR ART DOCUMENT
[0005] Patent Document [0006] Patent Document 1: Japanese Patent
Laid-open No. 2006-116163
SUMMARY OF INVENTION
Technical Problem
[0007] However, the syringe with needle wherein the syringe and the
needle tube are secured by the use of the adhesive has had problems
that the adhesive is needed and that an adhering step is needed
after formation of the syringe. Therefore, the number of component
parts is increased due to the adhesive, and the number of steps for
assembly is increased, thereby leading to a rise in cost.
[0008] Furthermore, the syringe may be filled with a drug.
Therefore, there have been problems that the adhesive used for
securing the needle tube and the syringe may come into contact
(liquid-liquid contact) with the drug placed in the syringe,
thereby imposing a bad influence on the drug. In view of this, in
recent years, as a new securing method in which an adhesive is not
used, a technology for integrally forming a needle tube and a
syringe by insert molding has been demanded.
[0009] In consideration of the above-mentioned problems, it is an
object of the present invention to provide a syringe with needle
wherein a needle tube and a syringe can be integrally formed by
insert molding, without using any adhesive.
Technical Solution
[0010] In order to solve the above-mentioned problems and attain
the object of the present invention, there is provided according to
the present invention a syringe with needle, including: a needle
tube having a needle tip capable of puncturing a living body; and a
syringe formed integrally with the needle tube by insert molding.
The syringe includes a main body which is filled with a drug, and a
securing section which is formed to be continuous with the main
body. The securing section secures the needle tube in a state that
the needle tip of the needle tube is protruded. In addition, the
securing section of the syringe has a holding hole in which a chuck
member for supporting and securing a circumferential surface of the
needle tube during the insert molding is inserted and passed.
Advantageous Effects
[0011] According to the syringe with needle of the present
invention, the securing section of the syringe is formed therein
with a holding hole in which the chuck member for supporting and
securing the circumferential surface of the needle tube is inserted
and passed. This enables the needle tube to be held from the side
of the circumferential surface thereof, instead of both
axial-directional ends thereof. This ensures that the needle tube
can be assuredly held by the chuck member during the molding, so
that the needle tube and the syringe can be integrally secured
without using any adhesive and at accurate relative positions. In
addition, the needle tube and the syringe can be integrally formed
by the insert molding. This makes it possible to omit the step for
adhering the needle tube and the syringe to each other, and to
realize a reduction in cost.
[0012] Furthermore, the chuck member makes contact with that part
of the needle tube which is covered by the securing section of the
syringe, and does not make contact with that part (puncturing part)
of the needle tube which is made to puncture a living body.
Therefore, such troubles as marring of the puncturing part of the
needle tube or deposition of dirt on the puncturing part can be
prevented from being caused by the chuck member.
BRIEF DESCRIPTION OF DRAWINGS
[0013] FIG. 1 is a perspective view showing an embodiment of a
syringe with needle according to the present invention.
[0014] FIG. 2 is a perspective view showing a major part of the
embodiment of the syringe with needle according to the present
invention.
[0015] FIG. 3 is a side view showing a major part of the embodiment
of the syringe with needle according to the present invention.
[0016] FIG. 4 is a perspective view showing, in section, a major
part of the embodiment of the syringe with needle according to the
present invention.
[0017] FIG. 5 is a sectional view showing a major part of the
embodiment of the syringe with needle according to the present
invention.
[0018] FIG. 6 is a perspective view showing a condition where a cap
is mounted.
[0019] FIG. 7 is a sectional view of the syringe with needle and
the cap shown in FIG. 6.
[0020] FIG. 8 is an illustration view showing a condition at the
time of insert molding of the syringe with needle according to the
present invention.
MODE FOR CARRYING OUT THE INVENTION
[0021] Now, an embodiment (exemplary mode) of a syringe with needle
according to the present invention will be described below,
referring to FIGS. 1 to 8. Incidentally, members shown in common in
the drawings are denoted by the same reference symbols. Besides,
the present invention is not to be restricted to the following
embodiment (mode).
[0022] Incidentally, description will be made in the following
order.
1. Configuration Example of Syringe with Needle 2. Assembly of
Syringe with Needle
1. Configuration Example of Syringe with Needle
[0023] First, a syringe with needle according to an embodiment of
the present invention (hereinafter referred to as "this
embodiment") will be described with referring to FIGS. 1 to 7.
[0024] FIG. 1 is a perspective view showing a syringe with needle
according to this embodiment, and FIG. 2 is a perspective view
showing a major part of the syringe with needle in this embodiment.
FIG. 3 is a side view showing the syringe with needle in this
embodiment, and FIGS. 4 and 5 are sectional views showing the
syringe with needle in this embodiment.
[0025] The syringe with needle, 1, is used to make a needle tip
puncture a skin surface and to inject a drug into a living body. As
shown in FIG. 1, this syringe with needle, 1, includes a syringe 2
which is filled with the drug, a needle tube 3 secured to the
syringe 2, and a cap 4 (see FIGS. 6 and 7).
[Needle Tube]
[0026] First, the needle tube 3 will be described.
[0027] As the needle tube 3, a needle tube with a size (outside
diameter: .phi.3.5 to 0.2 mm) of 10 to 33 gauge according to the
ISO medical needle tube standard (ISO9626: 1991/Amd. 1:2001(E)) is
used. Preferably, the size (outside diameter: .phi.1.7 to 0.2 mm)
of 16 to 33 gauge is used. The needle tube 3 is formed, at one
axial-directional end thereof, with a cutting edge for sharpening a
needle tip 3a. The needle tip 3a on axial-directionally one side of
the needle tube 3 is made to puncture a living body.
[0028] A material of the needle tube 3 may be, for example,
stainless steel; however, this is not restrictive, and other metals
such as aluminum, aluminum alloys, titanium, and titanium alloys
can also be used as the material. In addition, the needle tube 3 is
not limited to a straight needle, and may be a tapered needle which
is tapered at least a part thereof. It suffices for the tapered
needle to have a proximal portion greater in diameter than an end
portion of the needle tip 3a and to have an intermediate portion of
a tapered structure. Besides, a sectional shape of the needle tube
3 is not restricted to a circle but may be a polygon such as a
triangle.
[0029] Furthermore, a coating agent such as a silicone resin or a
fluoro-based resin is applied to the surface on the needle tip 3a
side of the needle tube 3. This ensures that when the needle tube 3
punctures a living body, the friction between the skin and the
needle tube can be reduced, and the pain attendant on the puncture
can be alleviated.
[0030] The needle tube 3 is secured to the syringe 2, with the
needle tip 3a in the state of protruding to the outside. The needle
tip 3a on the axial-directionally one side of the needle tube 3
protrudes from the distal end (tip) of a securing section 7 of the
syringe 2 which will be described later.
[Syringe]
[0031] Now, the syringe 2 will be described below.
[0032] The syringe 2 includes a main body 6 which is filled with
the drug, and the securing section 7 provided continuously with the
main body 6. The main body 6 is formed in a substantially
cylindrical shape, the securing section 7 is formed on
axial-directionally one side of the main body 6 in a continuous
form, and the main body 6 is opened at its end on the
axial-directionally other side. Besides, in the case of a prefilled
syringe, a tube hole 6a (see FIG. 2) of the main body 6 is filled
with the drug, and a gasket as a pusher (or plunger) is fitted into
the main body 6 from the axial-directionally other side. Further,
as shown in FIG. 4, the tube hole 6a of the main body 6 is in
communication with a proximal portion 3b constituting an
axial-directionally other end of the needle tube 3 secured to the
securing section 7.
[0033] Incidentally, while an example wherein the shape of the main
body 6 of the syringe 2 is the substantially hollow cylindrical
shape has been described in this embodiment, the shape of the main
body 6 may be a hollow tetragonal prism or hexagonal prism.
[0034] As shown in FIGS. 2 and 3, the securing section 7 protrudes
from the axial-directionally one side of the main body 6 along the
axial direction. The securing section 7 is formed integrally with
the needle tube 3, in a state of protruding the needle tip 3a of
the needle tube 3, by insert molding. With the needle tube 3 thus
formed integrally with the securing section 7 of the syringe 2 by
the insert molding, an adhering step using an adhesive can be
omitted. In addition, since no adhesive is used, there is no risk
that the adhesive might make contact with the drug placed in the
syringe 2, thereby imposing a bad influence on the drug.
[0035] As shown in FIG. 4, the needle tube 3 is placed on the axis
of the securing section 7 and along the axial direction. In
addition, the securing section 7 has a connection part 8 provided
continuously with one axial-directional end of the main body 6, and
a close contact part 9 provided continuously with the connection
part 8.
[0036] The connection part 8 is formed in the shape of a cross in a
cross-section surface in the direction orthogonal to the axial
direction of the main body 6. In addition, the diameter on the
close contact part 9 side of the connection part 8 is smaller than
the diameter of the close contact part 9. Therefore, the securing
section 7 is in a constricted shape at its connecting portion
between the connection part 8 and the close contact part 9.
Incidentally, while the connection part 8 in this embodiment is
formed to decrease in diametral size as one goes away from the main
body 6, the connection part 8 may be continuous while being
constant in diametral size.
[0037] Furthermore, the connection part 8 is formed therein with a
holding hole 11 which communicates from a circumferential surface
thereof to the needle tube 3 secured therein. As shown in FIGS. 4
and 5, the holding hole 11 is a through-hole orthogonal to the axis
of the connection part 8. In the holding hole 11, a chuck member 26
for supporting and securing a circumferential surface of the needle
tube 3 is inserted and passed (see FIG. 8). This ensures that, at
the time of the insert molding, the needle tube 3 can be held in
the direction orthogonal to the axial direction thereof. Therefore,
the insert molding can be easily carried out, with the needle tube
3 in a stable state. As a result, the needle tube 3 can be
prevented from being deformed or bent under the molding
pressure.
[0038] Incidentally, while an example wherein one holding hole 11
is provided has been described in this embodiment, this structure
is not restrictive, and not less than two holding holes may be
provided. In the case where a plurality of holding holes are
provided, the holding holes are preferably formed in the connection
part 8 at roughly regular intervals along the axial direction of
the needle tube 3.
[0039] In addition, as shown in FIG. 4, the connection part 8 is
formed with a spacing hole 12 at its end portion on the main body 6
side, namely, at its axial-directionally other end portion 8b of
the connection part 8. The spacing hole 12 is provided at the axis
of the other end portion 8b of the connection part 8. In the
spacing hole 12, is disposed a proximal portion 3b of the needle
tube 3.
[0040] Further, the spacing hole 12 is spaced from the outer
circumferential surface of the needle tube 3. Incidentally, a
distance S from the inner surface of the spacing hole 12 to the
outer circumferential surface of the needle tube 3 is set, for
example, in the range of 0.3 to 1.0 mm. The structure in which the
other end portion 8b is provided with the spacing hole 12 spaced
from the outer circumferential surface of the needle tube 3
prevents a resin from entering through the proximal portion 3b of
the needle tube 3 into a needle hole during the insert molding to
plug up the needle hole. Incidentally, this spacing hole 12 is
formed by a support part 21a which supports the proximal portion 3b
of the needle tube 3 during the insert molding (see FIG. 8).
[0041] Incidentally, while an example in which the connection part
8 is formed in a cross shape for reducing the material thickness
and securing strength has been described in this embodiment, this
is not restrictive. For instance, the shape of the connection part
8 may be a roughly cylindrical shape, a tetragonal prism or a
hexagonal prism.
[0042] The close contact part 9 is provided at one
axial-directional end of the connection part 8, namely, on the
distal side of the securing section 7. The close contact part 9 is
formed in a roughly cylindrical shape. The needle tip 3a of the
needle tube 3 protrudes from axial-directionally one side of the
close contact part 9. The close contact part 9, on the
axial-directionally one side, is opened in its portion other than
an outer circumferential portion thereof and the periphery of the
needle tube 3, for the purpose of reducing the material thickness
thereof. It is to be noted, however, that the purpose can be
fulfilled without providing the opening. In addition, the outer
circumferential surface of the close contact part 9 makes close
contact with an inner circumferential surface of the cap 4
described later.
[0043] Incidentally, while an example in which the close contact
part 9 is formed in the roughly cylindrical shape has been
described, the shape of the close contact part 9 may be a
tetragonal prism or a hexagonal prism insofar as it corresponds to
the shape of a tube hole 4a of the cap 4.
[0044] Examples of a material of the syringe 2 having the
above-mentioned configuration include various resins such as
polyvinyl chloride, polyethylene, polypropylene, cyclic
polyolefins, polystyrene, poly(4-methylpentene-1), polycarbonates,
acrylic resins, an acrylonitrile-butadiene-styrene copolymer,
polyesters such as polyethylene terephthalate, etc., a
butadiene-styrene copolymer, and polyamides (e.g., nylon 6, nylon
6.andgate.6, nylon 6.andgate.10, nylon 12). Among these, preferred
are such resins as polypropylene, cyclic polyolefins, polyesters,
and poly(4-methylpentene-1). Incidentally, it is preferable for the
material of the syringe 2 to be substantially transparent, for
securing inside visibility.
[0045] The drug with which the syringe 2 is filled may be any drug
that is ordinarily used as an injection agent. Examples of the drug
include protein drugs such as antibodies, etc., peptide drugs such
as hormones, etc., nucleic acid drugs, cell drugs, blood
derivatives, vaccines for prevention of various infectious
diseases, carcinostatic agents, anesthetics, narcotics,
antibiotics, steroid preparations, proteinase inhibitors, heparin,
saccharide injections such as glucose, etc., electrolyte correction
injections such as sodium chloride, potassium lactate, etc.,
vitamin preparations, lipid emulsions, contrast media, and
stimulants.
[Cap]
[0046] Now, the cap 4 will be described below.
[0047] As shown in FIGS. 6 and 7, the cap 4 is formed in a roughly
hollow cylindrical shape which is opened at one axial-directional
end thereof and closed at the other axial-directional end thereof.
The cap 4 is formed of an elastic material such as, for example, a
rubber or an elastomer. As shown in FIG. 6, the cap 4 is mounted to
axial-directionally one side of the syringe 2 in such a manner as
to cover the needle tip 3a of the needle tube 3 and the securing
section 7 of the syringe 2. In addition, as shown in FIG. 7, the
needle tip 3a side of the needle tube 3 and the securing section 7
are inserted into the tube hole 4a of the cap 4.
[0048] Incidentally, the inside diameter of the tube hole 4a of the
cap 4 is set to be approximately equal to or slightly smaller than
the outside diameter of the close contact part 9 of the securing
section 7. Therefore, when the cap 4 is mounted to the syringe 2,
the outer circumferential surface of the close contact part 9 of
the securing section 7 makes close contact with the inside
circumferential surface of the cap 4. This ensures that the needle
tip 3a side of the needle tube 3, which is on the distal side of
the close contact part 9 of the securing section 7, is hermetically
closed by the close contact part 9 and the inner circumferential
surface of the cap 4. As a result, deposition of bacteria on the
needle tip 3a can be prevented.
[0049] In addition, the inner circumferential surface of the cap 4,
by its elastic force, fastens a constricted portion at the
connecting portion between the close contact part 9 and the
connection part 8 of the securing section 7. As a result, the inner
circumferential surface of the cap 4 and the constricted portion of
the securing section 7 are engaged with each other, whereby the cap
4 can be prevented from slipping off from the syringe 2 during
transportation.
2. Assembly of Syringe with Needle
[0050] Now, a method of assembling the syringe with needle, 1,
configured as above will be described below referring to FIG.
8.
[0051] FIG. 8 is a sectional view showing a condition where the
syringe with needle is formed by insert molding.
[0052] First, a mold 20 for molding the syringe with needle, 1,
according to this embodiment will be described. As shown in FIG. 8,
the mold 20 includes a core 21 for forming the tube hole 6a of the
syringe 2, a first part 22, a second part 23 opposed to the first
part 22, and a third part 24 for forming the close contact part 9
of the syringe 2. The first part 22 and the second part 23 are each
provided with the chuck member 26 for supporting and securing a
side surface of the needle tube 3.
[0053] The chuck member 26 is provided at its tip with a V-shaped
groove so that the needle tube 3 can be easily supported thereby.
Incidentally, the tip of the chuck member 26 may be formed with a
curved surface slightly larger than the diameter of the needle tube
3, instead of being formed with the V-shaped groove. Further, an
elastic body may be provided at the tip of the chuck member 26 so
that the needle tube 3 is prevented from being smashed or being
marred on its side surface. Incidentally, the provision of the
elastic body at the tip of the chuck member 26 makes it possible to
flexibly cope with variability of the diametral size of the needle
tube 3.
[0054] The core 21 is formed at its tip with a support part 21a for
supporting and securing the proximal portion 3b of the needle tube
3. Besides, the third part 24 is formed therein with a guide hole
24a into which the needle tip 3a side of the needle tube 3 is
inserted.
[0055] Incidentally, the joints between the first part 22 and the
second part 23 and the third part 24 are located on the connection
part 8 of the securing section 7 of the syringe 2.
[0056] The method of assembling the syringe with needle, 1, by use
of the above-mentioned mold 20 is carried out as follows.
[0057] First, as shown in FIG. 8, the proximal portion 3b of the
needle tube 3 is supported and secured by the support part 21a of
the core 21. Similarly, the side surface of the needle tube 3 is
supported and secured by the chuck members 26 of the first part 22
and the second part 23. Next, the needle tip 3a of the needle tube
3 is inserted into the guide hole 24a of the third part 24, and the
needle tube 3 is set straight in relation to the mold 20. This
makes it possible to prevent the needle tube 3 from being deformed
during the molding, and to prevent the relative positions of the
syringe 2 and the needle tube 3 from being erroneously changed.
[0058] Subsequently, a resin is poured into the mold 20, thereby
performing the insert molding. As a result, the syringe 2 is formed
around the needle tube 3. In this instance, the securing section 7
of the syringe 2 is formed therein with the holding hole 11, in
which the chuck members 26 have been inserted and passed, and with
the spacing hole 12. Then, the cap 4 is put on the needle tube 3
and the syringe 2. In this way, the assembly of the syringe with
needle, 1, is completed.
[0059] Thus, the needle tube 3 and the syringe 2 can be integrally
formed by the insert molding. This ensures that an adhering step
using an adhesive can be omitted, and simplification of the
assembling step can be achieved. Accordingly, a reduction in cost
of assembly can be realized.
[0060] In addition, a part where the chuck members 26 support and
secure the needle tube 3 becomes an intermediate part of the
securing section 7 of the syringe 2 after the insert molding.
Further, a part where a support part of the core 21 supports and
secures the needle tube 3 is the proximal portion 3b on the side
opposite to the needle tip 3a. This part is not that part
(hereinafter referred to as "puncturing part") of the needle tube 3
which is made to puncture a living body. Thus, the puncturing part
of the needle tube 3 is not supported or secured during the insert
molding; therefore, such troubles as adhesion of dirt onto the
puncturing part or generation of mars on the side surface of the
puncturing part can be prevented from occurring due to the chuck
members 26 or the support part 21a of the core 21.
[0061] Furthermore, the needle tube 3 is supported and secured at
three points by the chuck members 26 and the support part 21a of
the core 21. This eliminates the need to support the needle tip 3a
of the needle tube 3. Therefore, the needle tip 3a can be prevented
from being damaged by the mold or the chuck members 26 or the like
during the molding.
[0062] As above-mentioned, the joints between the first part 22 and
the second part 23 and the third part 24 are located on the
connection part 8 of the securing section 7 of the syringe 2.
Therefore, a so-called parting line related to the mold is not
formed on the close contact part 9 which is brought into close
contact with the inner surface of the cap 4.
[0063] Thus, generation of burrs on the close contact part 9 can be
prevented. This ensures that when the cap 4 is mounted in position,
generation of a gap between the close contact part 9 and the inner
surface of the cap 4 due to the presence of burrs is prevented.
Consequently, air-tightness at the needle tip 3a of the needle tube
3 disposed on the distal side of the close contact part 9 can be
maintained, and the needle tip 3a of the needle tube 3 can also be
protected in a sterile state.
[0064] Incidentally, the present invention is not restricted to the
embodiments described above and illustrated by the drawings, and
various modifications are possible within the scope of the gist of
the invention as defined by the claims.
EXPLANATION OF REFERENCE SYMBOLS
[0065] 1 . . . Syringe with needle, 2 . . . Syringe, 3 . . . Needle
tube, 3a . . . Needle tip, 3b . . . Proximal portion, 4 . . . Cap,
4a . . . Tube hole, 6 . . . Main body, 6a . . . Tube hole, 7 . . .
Securing section, 8 . . . Connection part, 8b . . . Other end
portion, 9 . . . Close contact part, 11 . . . Holding hole, 12 . .
. Spacing hole, 20 . . . Mold, 21 . . . Core, 21a . . . Support
part, 26 . . . Chuck member.
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