JP2002039468A - Tube connecting member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tube connecting member for giving high joining force to a tube. SOLUTION: The tube connecting member 1A has a structure with a tube 10, preferably flexible, connected to a body 100A constituting, for example, a container. The body 100A has an enlarged portion 2 and an inner tube 3A and an outer tube 4 preferably formed in one unit with the enlarged portion 2. A tubular gap 5 is formed between the inner tube 3A and the outer tube 4. The end of the tube 10 is inserted into the gap 5. The end of the outer tube 4 is provided with a protruded portion 6. The protruded portion 6 ranges over the whole periphery of an inner periphery face 41 of the outer tube 4. A top 61 of the protruded portion 6 is rounded. The protruded portion 6 thrusts and clamps a tube wall 11 of the tube 1. The base end of the protruded portion 6 contains an adhesive bank 7 in which an adhesive 8 is filled. The adhesive 8 engages with the protruded portion 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tube connecting member for connecting a tube such as a flexible tube.

[0002]

2. Description of the Related Art A drop tube provided in a blood transfusion set, a transfusion set, or the like is used by connecting a flexible tube to a liquid outlet thereof. As this liquid outlet, there is known a liquid outlet having a double pipe structure having an inner pipe and an outer pipe, and connecting the tube by inserting a pipe wall at an end of the tube into a gap between the inner pipe and the outer pipe. ing.

Hitherto, polyvinyl chloride has been used as a material for a drip tube. However, recently, when the infusion cylinder made of polyvinyl chloride is incinerated after being discarded, depending on how it is incinerated,
It has been found that dioxin can be generated.

[0004] For this reason, the material of the drip tube is currently being switched to a material that does not easily generate dioxin. However, many materials that do not easily generate dioxin have a low frictional resistance with a flexible tube. Therefore, when such a material is used for a drip tube, there is a possibility that the flexible tube may fall out of the liquid outlet of the drip chamber when the flexible tube is strongly pulled. In order to prevent such a situation, at present, there is a demand for the development of a technique for increasing the bonding strength between the drip tube and the flexible tube.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a tube connecting member capable of obtaining a high tube joining force.

[0006]

This and other objects are achieved by the present invention which is defined below as (1) to (13).

(1) A tube connecting member having an inner tube and an outer tube provided on the outer periphery of the inner tube with a gap therebetween, and connecting the tube by inserting an end of the tube into the gap. A tube connecting member, wherein a convex portion that contacts the tube is formed at a portion of the inner tube and / or the outer tube facing the gap.

(2) The tube connecting member according to the above (1), wherein the thickness of the gap at the top of the projection is substantially equal to or less than the thickness of the tube wall of the tube.

(3) The tube connecting member according to the above (1) or (2), wherein the convex portion is formed on a tip end side of the outer tube.

(4) A convex portion is formed on each of the portions of the inner tube and the outer tube facing the gap, and the convex portion formed on the inner tube and the convex portion formed on the outer tube are The tube connecting member according to any one of the above (1) to (3), wherein positions in the longitudinal direction are different from each other.

(5) The method according to any one of (1) to (4), wherein an adhesive pool of an adhesive for connecting the tube and the tube connecting member is formed on the base end side of the convex portion. Tube connection member.

(6) The tube connecting member according to the above (5), wherein the cured product of the adhesive is engageable with the projection.

(7) A tube connecting member having an inner tube and an outer tube provided on the outer periphery of the inner tube with a gap therebetween, and connecting the tube by inserting an end of the tube into the gap. A tube connecting member, wherein an adhesive reservoir for connecting a tube and a tube connecting member is formed at a portion of the inner tube and / or the outer tube facing the gap.

(8) The tube connecting member according to the above (7), wherein a convex portion capable of engaging with the adhesive is formed at a portion of the inner tube and / or the outer tube facing the gap.

(9) The tube connecting member according to any one of the above (5) to (8), wherein the adhesive is made of a resin.

(10) The part of the inner tube and / or the outer tube facing the gap is subjected to a treatment for improving wettability with an adhesive before curing (5) to (9).
The tube connection member according to any one of the above.

(11) The treatment for improving the wettability includes:
The tube connecting member according to the above (10), which is a hydrophilic treatment or a roughening treatment.

(12) The tube connecting member according to any one of (1) to (11), wherein the outer tube has a guide surface for introducing the tube into the gap.

(13) The center line average roughness Ra of the surface of the inner tube and / or the outer tube facing the gap is 1 μm.
The tube connecting member according to any one of the above (1) to (12).

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a tube connecting member of the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings. FIG. 1 is a longitudinal sectional view showing a first embodiment (a state in which a tube is connected) of a tube connecting member of the present invention.

As shown in FIG. 1, the tube connecting member 1A of the present invention has a structure in which a flexible tube (tube) 10 is connected to a main body 100A constituting, for example, a container. . The main body 100A includes an enlarged diameter portion 2,
Inner tube 3A preferably formed integrally with enlarged diameter portion 2
And an outer tube 4.

The enlarged diameter portion 2 constitutes, for example, a container. Inside the enlarged diameter portion 2, for example, a liquid such as a physiological saline solution or various chemicals is stored. The lumen of the inner tube 3 </ b> A communicates with the inside of the enlarged diameter portion 2. In addition, the lumen of the tube 10 also communicates with the inside of the enlarged diameter portion 2 via the lumen of the inner tube 3A.

A tubular gap 5 is formed between the inner tube 3A and the outer tube 4. This gap 5 is open to the tip of the outer tube 4. The end of the tube 10 is inserted into the gap 5.

As shown in FIG. 1, the length of the outer tube 4 is set shorter than the length of the inner tube 3A. Thereby, the connecting operation of the tube 10 can be easily performed at the time of manufacturing the tube connecting member 1A. Also, the joining strength is increased.

In such a tube connecting member 1A, the outer diameter of the inner tube 3A is preferably slightly larger than the inner diameter of the tube 10. Thereby, as shown in FIG. 1, the end of the tube 10 is pushed open by the inner tube 3A, and the inner peripheral surface of the tube 10 is formed by the flexibility (elasticity) of the tube 10 itself. The outer peripheral surface (the surface facing the gap 5) 31 is in close contact. For this reason, in the tube connecting member 1A, the liquid tightness is improved, and the tube 10 is connected to the main body 100A.
It is hard to get out of the box.

As shown in FIG. 1, the outer diameter of the inner tube 3A has a tendency to decrease from the base end toward the distal end. In particular, the tendency of the outer diameter to decrease on the distal end side of the inner tube 3A is greater than the tendency of the outer diameter to decrease at the proximal end. Thereby, at the time of manufacturing the tube connecting member 1A, the operation of connecting the tube 10 to the main body 100A becomes easier. In the vicinity of the tip of the inner tube 3A, the outer peripheral surface 31 is rounded. This allows
The inner peripheral surface of the tube 10 is suitably prevented from being damaged.

A convex portion (first convex portion) is provided on the distal end side of the outer tube 4.
6 are formed. The convex portion 6 is provided in a ring shape over the entire circumference of the inner peripheral surface (surface facing the gap 5) 41 of the outer tube 4. The top 61 of the projection 6 is rounded.

As shown in FIG. 1, the tube connecting member 1A
Is viewed in a longitudinal section, the length of the slope 62 on the base end side of the projection 6 is shorter than the length of the slope 63 on the tip side. The slope 63 on the distal end side of the projection 6 forms a guide surface for introducing the base end of the tube wall 11 of the tube 10 into the gap 5.

The projection 6 is in contact with the tube wall 11 of the tube 10 and presses and clamps the tube wall 11. In the tube connecting member 1A, the connection (joining) strength of the tube 10 to the main body 100A is increased by the protrusion 6 pressing the tube 10. Such an effect is caused by the protrusion 6
Is more effective when the thickness of the gap 5 at the top 61 of the tube is approximately equal to or less than the thickness of the tube wall 11 of the tube 10.

When the projection 6 is provided over the entire circumference of the inner peripheral surface 41 of the outer tube 4 as in the tube connecting member 1A of the present embodiment, the connection strength between the main body 100A and the tube 10 is further increased. It will be. In addition, like the tube connecting member 1A of the present embodiment, the length of the slope 62 is
3, the tube 10 is easy to insert into the gap 5, and the tube 10 is
A becomes more difficult to come off. Further, since the length of the slope 62 is shorter than the length of the slope 63, an effect of further facilitating the operation of connecting the tube 10 to the main body 100A at the time of manufacturing the tube connection member 1A is obtained. Furthermore, when the top 61 of the convex portion 6 is rounded like the tube connecting member 1A, the convex portion 6 suitably prevents the tube wall 11 from being damaged, and the durability of the tube 10 is improved. I do.

The inner diameter of the outer tube 4 provided with such a convex portion 6 has a tendency to increase from the base end toward the distal end. In addition, as described above, the protrusion 6 is provided on the distal end side of the outer tube 4. Therefore, as shown in FIG. 1, in the tube connecting member 1 </ b> A, a part of the inner peripheral surface 41 on the proximal end side of the outer tube 4 is in contact with the tube 10 and supports the tube 10. In the tube connecting member 1A,
This point also contributes to making the tube 10 hard to come off from the main body 100A.

Since the inner diameter of the outer tube 4 has a tendency to increase from the base end to the distal end, the outer tube 4 has a tendency that the thickness decreases in the outer peripheral direction from the base end to the distal end. Have.

A ring-shaped recess (groove) 70 is formed on the base end side of the protrusion 6 (between the protrusion 6 and the base end of the outer tube 4). In the tube connecting member (tube connecting member after tube connection) 1A of the present embodiment, the concave portion 7 is formed.
An adhesive 8 (a cured product of the adhesive) 8 is filled in the area 0. That is, in the tube connecting member 1A, the recess 7
0 forms an adhesive reservoir 7 for storing the adhesive 8.

In the tube connecting member 1A, the tube wall 11 of the tube 10 and the outer tube 4 are bonded by the adhesive 8 provided in the adhesive reservoir 7. Thereby, the joining between the tube 10 and the main body 100A becomes extremely strong.

The adhesive 8 is applied to the slope 6 on the base end side of the projection 6.
Also touches 2. That is, the adhesive 8 is engaged with the projection 6. For this reason, the tube 10 is
When trying to move relatively in the tip direction of the
Is restricted by the protrusion 6. Therefore, the tube 10 moves in the direction of the distal end of the main body 100A (FIG. 1).
Even in the case where the tube 8 is strongly pulled (middle and lower), the adhesive 8 is caught on the convex portion 6 and the tube 10 is prevented from coming off from the main body 100A. Therefore, even when a material having a low friction coefficient with the tube 10 is used as a constituent material of the inner tube 3A or the outer tube 4, the tube 10 can be suitably prevented from coming off the main body 100A.

In particular, the tube connecting member 1A of the present embodiment.
When the convex portion 6 is provided on the distal end side of the outer tube 4 as described above, the depth of the adhesive reservoir 7 (the concave portion 70) can be easily increased, and the engagement between the adhesive 8 and the convex portion 6 can be improved. It will be more reliable. Further, when the convex portion 6 is provided on the distal end portion side of the outer tube 4, it becomes easy to supply the uncured adhesive to the adhesive reservoir 7 at the time of manufacturing the tube connecting member 1A. It should be noted that “the distal end side of the outer tube 4” may be an index that is closer to the distal end than the base end of the outer tube 4.

As the adhesive 8 provided in the adhesive reservoir 7, any known adhesive may be used, but an adhesive made of a resin (for example, an ultraviolet curable resin, a thermosetting resin, a radiation curable resin, a reaction curable resin). It is preferable to use an adhesive made of a resin or the like. As described later, a resin is preferably used as a constituent material of the main body 100A. Accordingly, if the adhesive 8 is also made of resin in response to this,
The adhesive strength between the adhesive 8 and the main body 100A is improved, and the bonding strength between the tube 10 and the main body 100A is improved.

The inner peripheral surface 41 of the outer tube 4 (where it comes into contact with the adhesive 8) is preferably subjected to a treatment for improving the wettability with the adhesive before hardening (adhesion enhancing treatment). That is, during the production of the tube connecting member 1A, before the uncured adhesive is supplied to the adhesive reservoir 7, a process of improving the 'wetting property of the uncured adhesive to the inner peripheral surface 41' is performed on the inner peripheral surface. Preferably, it is applied to surface 41. Thereby, the adhesive strength between the adhesive 8 and the main body 100A is further improved.

In the present invention, "improvement of the wettability with the adhesive before curing" means, for example, that an increase in the critical surface tension of the wetting index standard solution on the surface to which the adhesive is attached is used as an index. Can be. The critical surface tension is measured according to JIS
It can be measured with reference to the method described in K 6768.

The treatment for improving the wettability may be any treatment method as long as the wettability between the uncured adhesive and the inner peripheral surface 41 is improved.
Hydrophilic treatment or surface roughening treatment such as surface treatment with a solvent and surface treatment with a surfactant is preferred. When such a treatment method is used, the critical surface tension is suitably improved. That is, the wettability between the uncured adhesive and the inner peripheral surface 41 is suitably improved. Therefore, the adhesive strength between the adhesive 8 and the outer tube 8 is
It can be greatly increased. Further, the main body 100
When A is made of resin or the like, for example, the main body 10
By performing surface treatment such as surface roughening treatment on a mold for molding 0A (corresponding to a position where the main body 100A is in contact with the adhesive 8) and molding the main body 100A using the mold, the adhesive before curing is obtained. May be improved. Note that the outer peripheral surface 31 of the inner pipe 3 may be subjected to the same processing.

If the bonding strength between the tube 10 and the main body 100A can be sufficiently obtained without providing the adhesive 8, the adhesive 8 is not necessarily provided. In addition, when the bonding strength between the tube 10 and the main body 100A is sufficiently obtained by the adhesive 8, the protrusion 6 does not need to press the tube wall 11. Further, in this case, the convex portion may not be provided.

The main body 1 of such a tube connecting member 1A
00A, the outer peripheral surface 31 of the inner tube 3A and the inner peripheral surface 4 of the outer tube 4
And at least one of the center line average roughness Ra is 1
It is preferably at least 5 μm, more preferably at least 5 μm. Furthermore, in the main body 100A, the center line average roughness Ra of the outer peripheral surface 31 and the inner peripheral surface 41 is more preferably 1 μm or more, and particularly preferably 5 μm or more. Thereby, the tube 10
The frictional resistance between the outer peripheral surface 31 (and the inner peripheral surface 41) increases, and the tube 10 is harder to come off from the main body 100A. In addition, the adhesive strength between the adhesive 8 and the main body 100A also increases. The upper limit of the preferred range of the center line average roughness Ra is not particularly limited.
m can be set.

The constituent material of the main body 100A, in particular, the constituent material of the inner tube 3A and / or the outer tube 4 is not particularly limited. For example, polyolefin such as polyethylene and polypropylene, ethylene-vinyl acetate copolymer (EVA),
Polyvinyl chloride, polystyrene, polyamide, polyimide, polycarbonate, poly- (4-methylpentene-
1), acrylic resin, polymethyl methacrylate, acrylonitrile-butadiene-styrene copolymer (AB
S resin), acrylonitrile-styrene copolymer (AS
Resin), butadiene-styrene copolymer, polyester such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyether, polyether ketone (PEK), polyether ether ketone (PEEK), polyacetal (POM), polyphenylene Various polymer materials such as oxide, polysulfone, polyethersulfone, polyphenylene sulfide, polyarylate, aromatic polyester (liquid crystal polymer), polytetrafluoroethylene, polyvinylidene fluoride, other fluorine-based resins, epoxy resins, silicone resins, and polyurethane Is mentioned. In addition, it may be made of various metal materials such as stainless steel, aluminum and titanium, and various ceramic materials (porcelain) such as alumina and silica.

Among them, as the constituent material of the main body 100A, polyolefin such as polyethylene and polypropylene is preferably used. According to the present invention, the main body 100A
Even if polyolefin is used as the constituent material of
The connection strength between the tube and the tube 10 can be kept high.
Generally, the polyolefin main body 100A (the inner tube 3A and the outer tube 4) tends to have low frictional resistance with the tube 10. However, as described above, according to the present invention, the main body 100A and the tube 10 can be connected with high strength. Therefore, even if polyolefin is used as a constituent material of the main body 100A, the tube 10 can
It is extremely difficult to get out of A.

When a polyolefin is used as a constituent material of the main body 100A, the tube connecting member 1 which is easy to dispose of is used.
A can be obtained. Polyolefins do not usually generate dioxins when subjected to incineration, or
This is because even if it is generated, the amount of generation is extremely small. As described above, by using a non-chlorine-based resin such as polyolefin (a material that does not easily generate dioxin) as a constituent material of the main body 100A, it is possible to obtain a tube connecting member 1A that is advantageous for disposal after use. That is,
ADVANTAGE OF THE INVENTION According to this invention, the high joining strength of a tube and the convenience of disposal can be made compatible. Note that this description does not exclude the use of a chlorine-based resin such as polyvinyl chloride as a constituent material of the main body 100A or the like in the present invention.

The tube 10 connected to the main body 100A is not particularly limited. For example, resin materials such as polyolefins such as polyethylene and polypropylene, soft polyvinyl chloride, ethylene-vinyl acetate copolymer (EVA), polyamide and the like can be used. And rubber materials such as natural rubber, silicone rubber, and styrene-butadiene rubber, and elastic materials such as various thermoplastic elastomers.
Among them, for the same reason as described above, the constituent material of the tube 10 is preferably a non-chlorine-based material such as polyolefin.

In the first embodiment of the tube connecting member described above, the projection is provided over the entire circumference of the outer tube. However, the projection may not be provided over the entire circumference of the outer tube.
A plurality of convex portions may be provided intermittently along the circumferential direction.

Hereinafter, a second embodiment of the tube connecting member of the present invention will be described with reference to FIG. In the following description of the tube connecting member 1B, matters different from the tube connecting member 1A will be mainly described, and description of common matters will be omitted.

In the tube connecting member 1B shown in FIG. 2, the inner tube 3B has a second convex portion 9 smaller than the convex portion (first convex portion) 6.
Are formed. The second protrusion 9 is located closer to the base end than the protrusion 6. Further, the second convex portion 9 is provided over the entire outer circumference (the surface facing the gap 5) 31 of the inner tube 3B.

When the protrusions 6 and the second protrusions 9 have different longitudinal positions as in the tube connecting member 1B of the present embodiment, the tube 10 has an S-shaped local cross section in the gap 5. Deform to. Thereby, the tube 10
It becomes more difficult to come off from the main body 100B. In addition, as shown in FIG. 2, when the second protrusion 9 is located closer to the base end than the protrusion 6, the operation of connecting the tube 10 to the main body 100 </ b> B is easy during manufacture of the tube connection member 1 </ b> B. Is obtained. The fact that the second convex portion 9 is smaller than the convex portion 6 also contributes to facilitating the connection operation of the tube 10.

The other matters relating to the second convex portion are the same as those of the aforementioned convex portion 6. Therefore, the top part 91 of the second convex part 9 is rounded. Further, as shown in FIG. 2, when the tube connecting member 1B is viewed in a longitudinal section, the length of the slope 92 on the base end side of the second convex portion 9 is:
It is shorter than the length of the slope 93 on the tip side.

The second protrusion 9 also presses and clamps the tube wall 11 of the tube 10 like the protrusion 6. As described above, by providing a plurality of convex portions on the main body, in the tube connecting member 1B, the tube 10 is harder to come off from the main body 100B.

In the tube connecting member 1B of the present embodiment,
An adhesive reservoir 7 ′ is formed on the base end side of the second convex portion 9. The adhesive pool 7 'is provided with an adhesive 8'. For the same reason as described above, the outer peripheral surface 31 of the inner tube 3B (where it comes into contact with the adhesive 8 ') has been subjected to a treatment for improving the wettability with the adhesive before curing (adhesion enhancing treatment). Is preferred.

The adhesive 8 may be provided between the tube 10 and the slope 62 on the base end side of the projection 6. In addition, the convex portion may be provided only on the inner tube.

Hereinafter, an example of a method for manufacturing the tube connecting member 1A will be described. Note that the method of manufacturing the tube connecting member 1B is the same as the method of manufacturing the tube connecting member 1A, and a description thereof will be omitted.

<1> First, the main body 100A is prepared. For example, the main body 100A can be obtained by molding a resin.

<2> Next, the portion of the outer tube 4 (and / or the inner tube 3A) facing the gap 5 is subjected to a treatment for improving the wettability with the uncured adhesive. At this time, it is preferable to perform the treatment in this step so that the critical surface tension of the wetting index standard solution on the surface to which the adhesive is attached is improved by 2 dyn / cm or more. Further, it is more preferable to perform the treatment in this step so that the critical surface tension is improved by 5 dyn / cm or more. Thereby, the adhesive strength of the adhesive 8 is greatly increased.

In the main body 100A before the tube 10 is inserted into the gap 5, although not particularly limited, at least one of the outer peripheral surface 31 of the inner tube 3A and the inner peripheral surface 41 of the outer tube 4 has a wetting index standard solution. Critical surface tension is 35-50dy
It is preferably about n / cm. Thereby, the adhesive strength between the adhesive 8 and the main body 100A increases. When the joint strength between the tube 10 and the main body 100A is sufficiently obtained, such as when the coefficient of friction between the tube 10 and the main body 100A is sufficiently high, the critical surface tension does not need to be within the above range.

<3> Next, the end of the tube 10 is inserted into the gap 5. As a result, the tube 10 is
A is connected. <4> Next, an uncured adhesive is supplied to the adhesive pool 7.

<5> Next, the adhesive is cured. The method of curing the adhesive is appropriately selected according to the type of the adhesive, and examples thereof include a method of irradiating ultraviolet rays, a method of heating, a method of irradiating radiation, and a method of leaving the adhesive.

As a result, the adhesive 8 is formed, and the tube connecting member 1A as shown in FIG. 1 is obtained.

In the step <1>, the (body 100
(Where A is in contact with adhesive 8) body 100A using a mold that has been subjected to a surface treatment such as a roughening treatment.
By molding the outer tube 4 (and / or the inner tube 3
The portion facing the gap 5 in A) may be subjected to a treatment for improving the wettability with the uncured adhesive.

The end of the tube 10 may be inserted into the gap 5 after the uncured adhesive is supplied to the adhesive reservoir 7. Alternatively, the uncured adhesive may be applied to the end of the tube 10 and supplied, and the uncured adhesive may be attached to the outer peripheral surface of the tube 10, and then the tube 10 may be inserted into the gap 5. In this way, the uncured adhesive can be supplied to the adhesive pool 7.

The tube connecting member of the present invention includes, for example, a drip tube, a drip chamber, a bubble trap, a pillow,
Applicable to any application as long as tubes (tubes) can be connected, such as various connectors, branch pipes, multi-way cocks, hubs, sheaths, syringes, pumps, and liquid inlets or drains of various bags. Can be.

Although the tube connecting member of the present invention has been described based on the embodiments shown in the drawings, the present invention is not limited to these embodiments. Can be replaced with the one having the configuration described above.

[0066]

EXAMPLE A drip tube having a shape as shown in FIGS. 1 and 2, that is, a tube connecting member was manufactured as follows.

(Example 1) [1] First, polypropylene was injection-molded using an ordinary mold to obtain a main body having a shape as shown in FIG. 1 or FIG.

[2] Next, a corona reading system (“Multi-Gin” manufactured by 3DT; output 570 W, electrode voltage 7 kV, electrode frequency 60 Hz, number of electrodes 1) was formed on the inner peripheral surface of the outer tube and the outer peripheral surface of the inner tube. Was subjected to a corona treatment at atmospheric pressure for 3 seconds to improve the wettability with the uncured adhesive.

[3] Next, the end of the tube made of polybutadiene was inserted into the gap formed between the inner tube and the outer tube, and the tube was connected to the main body.

[4] Next, an uncured adhesive made of an acrylic resin (ultraviolet curing type) is injected into the adhesive pool.
Supplied.

[5] Finally, the adhesive supplied to the adhesive reservoir was cured by irradiating ultraviolet rays.

As a result, five drip tubes each having a shape as shown in FIGS. 1 and 2 were obtained. Before performing the step [2], the critical surface tension of the outer peripheral surface of the outer tube and the inner peripheral surface of the inner tube was measured with a wetting index standard solution (manufactured by Wako Pure Chemical Industries, Ltd.). there were. In addition, the step [2]
After performing the above, the critical surface tension of the outer peripheral surface of the outer tube and the inner peripheral surface of the inner tube measured with a wetting index standard solution was about 38 dyn / cm. From this result, it can be seen that the wettability of the uncured adhesive to the outer peripheral surface of the outer tube and the inner peripheral surface of the inner tube was improved by the step [2].

(Example 2) A tube connecting member was manufactured in the same manner as in Example 1 except for the following. [1 '] First, as shown in FIG. 1 or FIG. 2, polypropylene is injection-molded using a mold having a surface roughened on the inner peripheral surface of the outer tube and the portion corresponding to the outer peripheral surface of the inner tube. A body having such a shape was obtained. After the completion of this step, the center line average roughness Ra of the inner peripheral surface of the outer tube and the outer peripheral surface of the inner tube was measured, and was about 6.3 μm. -The step [2] was not performed.

After performing the above step [1 ′], the critical surface tension of the outer peripheral surface of the outer tube and the inner peripheral surface of the inner tube was measured with a wetting index standard solution to be about 38 dyn / cm. The same operation as in the above step [1 '] was performed using a normal mold, and the critical surface tension of the obtained main body was measured in the same manner. As a result, it was about 32 dyn / cm. From this result, it can be seen that the wettability of the uncured adhesive to the outer peripheral surface of the outer tube and the inner peripheral surface of the inner tube was improved by the roughening treatment of the mold. As described above, when a treatment for improving the wettability is performed on a mold or the like for molding the main body, the critical surface tension of the main body obtained using the mold or the like on which the treatment is performed by the standard solution of the wetting index is determined as follows. Untreated)
A value greater than the critical surface tension of the main body obtained using a normal mold or the like can be used as an index of “improvement of wettability”.

(Example 3) A tube connecting member was manufactured in the same manner as in Example 1 except for the following items. [1 '] The above step [1'] was performed. After the end of this process,
Center line average roughness Ra of the inner peripheral surface of the outer tube and the outer peripheral surface of the inner tube
Was about 6.3 μm. [2] The step [2] was performed. Before performing this step [2], the critical surface tension of the outer peripheral surface of the outer tube and the inner peripheral surface of the inner tube was measured with a wetting index standard solution (manufactured by Wako Pure Chemical Industries, Ltd.). there were. After performing the step [2], the critical surface tension of the outer peripheral surface of the outer tube and the inner peripheral surface of the inner tube measured with the wetting index standard solution was about 38 dyn / cm. From this result, it can be seen that the wettability of the uncured adhesive to the outer peripheral surface of the outer tube and the inner peripheral surface of the inner tube was improved by the step [2].

Example 4 A drip tube was manufactured in the same manner as in Example 1 except that the material of the tube was changed to polyvinyl chloride.

(Evaluation) Ethylene oxide gas sterilization was performed on each of the drip tubes obtained in each of the examples, and then these were aged at 60 ° C. for 24 hours.

Thereafter, the user gripped the main body and the tube, and pulled the tube strongly in various directions including the axial direction. As a result, in any of the drip tubes, the tube did not fall out of the main body even if the tube was strongly pulled in any direction.

[0079]

As described above, according to the present invention, it is possible to provide a tube connecting member capable of obtaining a high tube joining force. That is, according to the present invention, it is possible to obtain a tube connecting member in which the tube hardly comes off from the connecting portion.

Further, according to the present invention, the range of selection of materials is widened, and it is easy to select materials that can be easily disposed. Through these advantages, the present invention can contribute to improvement of waste disposal problems and the like.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a tube connecting member of the present invention.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the tube connecting member of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1A, 1B Tube connection member 100A, 100B Main body 2 Large diameter portion 3A, 3B Inner tube 31 Outer peripheral surface 4 Outer tube 41 Inner peripheral surface 5 Gap 6 Convex portion 61 Top portion 62 Base end slope 63 Front end slope 7, 7 'Adhesive pool 70 recess 8, 8' adhesive 9 second convex portion 91 top portion 92 slope at base end 93 slope at tip end 10 tube 11 tube wall

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masaru Saiki 1727, Tsukiji Arai, Showa-machi, Nakakoma-gun, Yamanashi Prefecture 1 Terumo F-term (reference) 3H013 DA02 DA03 3H017 HA14 4C066 JJ02 PP03

Claims (13)

[Claims] 1. A tube connecting member having an inner tube and an outer tube provided on the outer periphery of the inner tube with a gap interposed therebetween, and connecting the tube by inserting an end of the tube into the gap. A tube connecting member, wherein a convex portion in contact with the tube is formed at a portion of the inner tube and / or the outer tube facing the gap. 2. The tube connecting member according to claim 1, wherein the thickness of the gap at the top of the projection is substantially equal to or less than the thickness of the tube wall of the tube. 3. The tube connecting member according to claim 1, wherein the projection is formed on a tip end side of the outer tube. 4. A convex portion is formed on each of the portions of the inner tube and the outer tube facing the gap, and the convex portion formed on the inner tube and the convex portion formed on the outer tube are: 2. The method according to claim 1, wherein the positions in the longitudinal direction are different from each other.
4. The tube connecting member according to any one of items 3 to 3. 5. The tube connecting member according to claim 1, wherein an adhesive pool of an adhesive for connecting the tube and the tube connecting member is formed closer to the base end than the convex portion. 6. The tube connecting member according to claim 5, wherein the cured product of the adhesive is capable of engaging with the projection. 7. A tube connecting member having an inner tube and an outer tube provided on the outer periphery of the inner tube via a gap, and connecting the tube by inserting an end of the tube into the gap. A tube connecting member, wherein an adhesive pool of an adhesive for connecting a tube and a tube connecting member is formed at a portion of the inner tube and / or the outer tube facing the gap. 8. The tube connecting member according to claim 7, wherein a convex portion capable of engaging with the adhesive is formed at a portion of the inner tube and / or the outer tube facing the gap. 9. The tube connecting member according to claim 5, wherein the adhesive is made of a resin. 10. The method according to claim 5, wherein a portion of the inner tube and / or the outer tube facing the gap is subjected to a treatment for improving wettability with an adhesive before curing. Tube connection member. 11. The tube connecting member according to claim 10, wherein the treatment for improving the wettability is a hydrophilic treatment or a roughening treatment. 12. The outer tube has a guide surface for introducing the tube into the gap.
The tube connection member according to any one of the above. 13. The tube connecting member according to claim 1, wherein a center line average roughness Ra of a surface of the inner tube and / or the outer tube facing the gap is 1 μm or more.