JP5092925B2 - Connection member and connection method using the same - Google Patents

Description

  The present invention relates to a connecting member and a connecting method for connecting a tube used for medical use, for example.

  Enteral nutrition therapy and parenteral nutrition therapy are known as methods for administering nutrition and drugs to patients regardless of oral administration. In enteral nutrition therapy, a tube passed from the patient's nasal cavity to the stomach or duodenum (commonly referred to as a “nasal tube”) or a gastric fistula formed on the patient's abdomen (the procedure for forming a gastric fistula is “Percutaneous Endoscopic”). A liquid (generally referred to as “enteral nutrient”) such as a nutrient, liquid food, or drug is administered via a tube (commonly referred to as “PEG tube”) inserted in a gastrostomy ”. In parenteral nutrition therapy, a liquid substance (generally called “infusion”) containing nutritional components and drug components such as glucose through a tube (generally called “infusion line”) connected to a venous needle pierced into a patient's vein. Is administered).

  When a liquid substance is administered to a patient by such a method, a connecting member (connector) for connecting a plurality of tubes is used.

Patent Document 1 discloses an elastic member in which a hollow portion into which a tube is inserted is formed, four rod-shaped clamping members that are provided at equal angular intervals around the elastic member and substantially parallel to the tube, and 4 A connector is described that includes a tapered surface that abuts against the tip of a holding member of a book. When the four clamping members are pressed toward the taper surface, the tips of the four clamping members are displaced toward the elastic member, tightening the elastic member, and the hollow portion of the elastic member is reduced in diameter so that it is inserted into the hollow portion. Can be fixed.
JP-A-10-85340

  However, the connector described in Patent Document 1 fixes the tube by pressing the outer peripheral surface of the tube with an elastic member. Therefore, for example, when trying to fix a soft tube, the tube is easily deformed by the pressing force of the elastic member, and the flow path in the tube is blocked. If the pressing force of the elastic member is set small so that the tube does not deform, the tube cannot be firmly fixed, and the tube is easily pulled out from the connector.

  For example, in nutritional supplementation via a PEG tube, a nutrient agent having a relatively high viscosity may be administered. In this case, the nutrient cannot be moved only by the action of gravity, and it is necessary to apply pressure to the nutrient and pump the nutrient toward the patient. In such a case, a connection member that can be connected with high connection strength so as not to come out of the PEG tube is desired. In addition, a connection member that can connect the PEG tube in a liquid-tight manner is desired so that the nutrients to which pressure is applied do not leak.

  Furthermore, in the nutrition supply via the PEG tube, a reconnectable connection member that can be repeatedly connected to the PEG tube only when the nutrition is supplied is desired.

  In addition, standards for various medical tubes such as PEG tubes are not standardized, and tubes with different inner and outer diameters are on the market. It is desired that a plurality of types of tubes having different sizes can be connected by a common connecting member.

  An object of the present invention is to provide a connection member and a connection method that can be connected in a liquid-tight manner with high connection strength even with a soft tube, can be reconnected, and can connect tubes of different sizes. And

The connection member of the present invention is a connection member for connecting a hollow tube having flexibility, and includes an outer part in which a circular opening is formed and an outer peripheral surface having a circular cross-sectional shape. The inner part in which a through-hole penetrating the insertion part is formed, the opening of the outer part and the insertion part of the inner part are coaxial, and the opening of the outer part and the inner part A connection mechanism for connecting the outer part and the inner part so that the insertion part of the part can be approached and separated, and at least a part of the inner peripheral surface of the opening of the outer part; It is configured to be able to sandwich a tube with the insertion part of the inner part, the outer part or the inner part has transparency or translucency, and the outer peripheral surface of the insertion part is The closer to the tip of the insertion section Decreases, the taper angle θ2 has a tapered surface of the inner peripheral surface of said opening of said outer parts, cylindrical surface, or, smaller than the in the in the base end side diameter becomes larger and the taper angle θ2 of the parts The insertion part of the inner part is inserted into the opening of the outer part so that the outer part and the insertion part can sandwich a very small area of the tube having a taper surface with a taper angle θ1. Then, the outer part and the tapered surface of the insertion portion are substantially in contact with each other by a line.

  The connection method of the present invention is a connection method of connecting the above-described connection member of the present invention and a flexible hollow tube so that the through hole of the inner part and the tube communicate with each other, One end of the tube is inserted into the opening of the outer part, and the outer part and the inner part are relatively moved so that the opening of the outer part and the insertion part of the inner part approach each other. By doing so, the tube is sandwiched between at least a part of the inner peripheral surface of the opening of the outer part and the insertion portion of the inner part.

  According to the present invention, the tube can be connected in a liquid-tight manner with high connection strength regardless of its mechanical strength. Also, reconnection is possible, and tubes of different sizes can be connected.

  In the connection member according to the present invention, it is preferable that the outer peripheral surface of the insertion portion has a tapered surface whose diameter decreases as the tip of the insertion portion is approached. Thereby, since an insertion part can be easily inserted in a tube, the connection workability | operativity of a tube improves. Even if the inner diameters of the tubes are different, the inner peripheral surface of the tube can be brought into close contact with the tapered surface of the insertion portion, so that the sealing performance of the connection is improved.

When the outer diameter of the tip of the insertion part is D2 _top , the maximum outer diameter of the tapered surface of the insertion part is D2 _max , and the minimum inner diameter of the opening of the outer part is D1 _min , D2 _top <D1 _min < It is preferable to satisfy D2 _max . Thereby, a tube and a connection member can be liquid-tightly connected with higher connection strength.

  When the insertion part of the inner part is inserted into the opening of the outer part, the outer part and the tapered surface of the insertion part are preferably in contact with each other by a line. As a result, the outer part and the insertion portion sandwich a very small area of the tube. Accordingly, since the clamping force is concentrated in this small region, the tube 2 and the connection member 10 can be connected in a liquid-tight manner with higher connection strength.

The inner peripheral surface of the opening of the outer part has a tapered surface having a large diameter on the proximal end side of the inner part, the taper angle of the tapered surface of the outer part is θ1, and the tapered surface of the insertion part is when the taper angle and θ2, satisfy θ1 <θ2. Thereby, a tube and a connection member can be liquid-tightly connected with higher connection strength. Further, since the tube 2 can be held between the tapered surface 211 of the insertion portion and the outer part without deeply inserting the insertion portion into the tube, the connection workability is improved.

  It is preferable that the connection mechanism includes a screw. Accordingly, the opening of the outer part and the insertion part of the inner part can be made to approach and separate from each other while the opening of the outer part and the insertion part of the inner part are coaxial, and the tube can be separated from the insertion part of the inner part and the outer part. A mechanism capable of maintaining a state of being sandwiched between parts can be realized easily and at low cost. Here, the screw is preferably coaxial with the opening of the outer part and the insertion part of the inner part.

Minimum inner diameter D1 _min of the opening of the outer part is preferably equal to or greater than this outer diameter DT _out of the one end of the tube. Thereby, since a tube can be easily inserted in opening of an external part, connection workability | operativity improves.

Outer diameter D2 _top of the tip of the insertion portion of the inner part is preferably equal to or smaller than this inner diameter DT _in the end of the tube. Thereby, since an insertion part can be easily inserted in a tube, connection workability | operativity improves.

  Hereinafter, embodiments of the present invention will be described in detail. However, it goes without saying that the present invention is not limited to the following embodiments.

  FIG. 1 is a sectional view taken along a central axis 10a of a connection member 10 according to an embodiment of the present invention. The connecting member 10 has a rotationally symmetric shape with respect to the central axis 10a. The connecting member 10 includes an outer part 100 and an inner part 200.

  The outer part 100 includes a cylindrical portion 110 having a substantially cylindrical shape as a whole and a disc-shaped sandwiching plate 120 provided at one end of the cylindrical portion 110 in the direction of the central axis 10a. An opening 121 which is a through hole is formed in the sandwiching plate 120. The shape of the inner peripheral surface 122 surrounding the opening 121 viewed along the central axis 10a is circular, and the center thereof coincides with the central axis 10a. A female screw 111 is formed on the inner peripheral surface of the cylindrical portion 110 opposite to the side on which the clamping plate 120 is provided. The central axis of the female screw 111 coincides with the central axis 10a.

  The inner part 200 has a substantially cylindrical shape as a whole, and a cylindrical through hole 201 having the central axis 10a as the central axis is formed at the center thereof. An insertion portion 210 is provided at one end of the inner part 200 in the direction of the central axis 10a. The cross-sectional shape perpendicular to the central axis 10a on the outer peripheral surface of the insertion portion 210 is circular, and the center thereof coincides with the central axis 10a. The outer peripheral surface of the insertion part 210 is preferably a tapered surface 211 whose diameter decreases as it approaches the tip of the insertion part 210 (the end closer to the opening 121 of the outer part 100). An end opposite to the insertion portion 210 of the inner part 200 is referred to as a base end 202. A male screw 203 that can be screwed with the female screw 111 of the outer part 100 is formed in a region between the insertion portion 210 and the base end 202 on the outer peripheral surface of the inner part 200. The central axis of the male screw 203 coincides with the central axis 10a.

  As shown in FIG. 1, when the female screw 111 of the outer part 100 and the male screw 203 of the inner part 200 are screwed together, the opening 121 of the outer part 100 and the insertion portion 210 of the inner part 200 are coaxial. Then, when the inner part 200 and the outer part 100 are relatively rotated around the central axis 10a, the opening 121 of the outer part 100 and the insertion portion 210 of the inner part 200 can be moved closer to and away from each other in the direction of the central axis 10a. it can.

  A tube connecting method using the connecting member 10 of the present embodiment configured as described above will be described below.

  In this example, as shown in FIG. 2, one end of a flexible hollow tube 1 is connected in advance to the base end 202 of the inner part 200 by means such as fusion or adhesion. The tube 1 may be, for example, a tube constituting a nutrition set (not shown) connected to a container in which a liquid material such as a nutrient or liquid food is stored. The nutrition set is not particularly limited and may be any known nutrition set. In this example, the tube 1 is inserted into the proximal end 202 of the inner part 200 and the inner part 200 and the tube 1 are connected. However, the present invention is not limited to this, for example, the proximal end 202 of the inner part 200. The inner part 200 and the tube 1 may be connected so that the tube 1 covers the outer peripheral surface of the tube.

  The outer part 100 is rotated relative to the inner part 200 to move the opening 121 of the outer part 100 away from the tip of the insertion part 210 of the inner part 200.

  In this state, one end of the flexible hollow tube 2 is inserted into the opening 121 of the outer part 100 in the direction of the arrow 2a. An example of the tube 2 is a PEG tube. In this case, the other end (not shown) of the tube (PEG tube) 2 is inserted into a gastric fistula formed on the patient's abdomen. The PEG tube is not particularly limited, and may be any known PEG tube. The end portion of the tube 2 shown in FIG. 2 has a tapered shape in which the inner diameter and the outer diameter increase as approaching the end, but the inner diameter and / or the outer diameter may be constant.

  As described above, the opening 121 of the outer part 100 and the insertion portion 210 are coaxial. Therefore, when the tube 2 is inserted into the opening 121 of the outer part 100, the insertion portion 210 is then inserted into the tube 2. In the present embodiment, since the tapered surface 211 is formed at the distal end of the insertion portion 210, the insertion portion 210 can be easily inserted into the tube 2. When the tube 2 is further pushed into the opening 121, the tube 2 is elastically stretched in the circumferential direction by the tapered surface 211 of the insertion portion 210 and covers the tapered surface 211 as shown in FIG.

  Next, the outer part 100 is rotated relative to the inner part 200, and the outer part 100 and the inner part 200 are centered in a direction in which the opening 121 of the outer part 100 and the insertion portion 210 of the inner part 200 approach each other. It moves relatively along the axis 10a. And finally, as shown in FIG. 4, at least a part of the inner peripheral surface 122 surrounding the opening 121 of the outer part 100 (in this embodiment, the edge 125 on the side close to the tapered surface 211 of the inner peripheral surface 122) is tapered. It contacts the outer peripheral surface of the tube 2 covering the surface 211. From this state, the outer part 100 is rotated more strongly with respect to the inner part 200 so that the tube 2 is compressed between the insertion portion 210 and the outer part 100. Thus, the tube 1 and the tube 2 communicate with each other through the through hole 201 of the inner part 200, and the connection between the connection member 10 and the tube 2 of the present embodiment is completed.

  In the above connection method, one end of the tube 2 is inserted into the opening 121 of the outer part 100 in the state shown in FIG. 2 in which the female screw 111 of the outer part 100 and the male screw 203 of the inner part 200 are screwed together. Although the state of FIG. 3 was obtained, the present invention is not limited to this. For example, the outer part 100 and the inner part 200 are separated, the tube 2 is first inserted into the opening 121 of the outer part 100, then the insertion portion 210 is inserted into the tube 2, and finally the outer part 100 is inserted. 3 may be obtained by screwing the female screw 111 and the male screw 203 of the inner part 200 together.

  Alternatively, after inserting the tube 2 into the opening 121 of the outer part 100, the outer part 100 is relative to the inner part 200 so that the opening 121 of the outer part 100 and the insertion part 210 of the inner part 200 approach each other. It may be rotated. In this case, the insertion part 210 is inserted into the tube 2 in parallel with approaching the opening 121, and the state shown in FIG. 4 is obtained.

  Separation of the connection member 10 and the tube 2 may be performed in reverse to the above connection work. That is, from the state of FIG. 4, the outer part 100 is rotated relative to the inner part 200 to separate the outer part 100 from the tube 2 as shown in FIG. It can be pulled out (see FIG. 2).

  As described above, according to the connection member 10 of the present embodiment, the tube 2 is firmly held between the insertion portion 210 of the inner part 200 and the inner peripheral surface 122 of the opening 121 of the outer part 100. 10 and the tube 2 can be connected with high connection strength. Therefore, for example, even when a nutrient having a relatively high viscosity is applied to a patient under pressure, the tube 2 does not come out of the connecting member 10.

  In the conventional connector described in Patent Document 1, the connection strength between the tube and the connector is obtained by pressing the outer peripheral surface of the tube with an elastic member. Therefore, when trying to connect a soft tube, the tube is deformed by the pressing force applied to the outer peripheral surface of the tube, and the flow path in the tube is blocked or the desired connection strength cannot be obtained. There was a problem. On the other hand, according to the connection member of the present embodiment, the tube 2 is sandwiched between the outer peripheral surface (tapered surface 211) of the insertion portion 210 and the inner peripheral surface 122 of the outer part 100. That is, the hollow tube 2 receives a pressing force from both the inner side surface and the outer side surface. Therefore, the tube 2 can be firmly fixed regardless of the mechanical strength of the tube 2. Moreover, even if the tube 2 is firmly fixed by the outer part 100 and the inner part 200, the flow path in the tube 2 is not blocked.

  In a cross section along a plane perpendicular to the central axis 10a, the outer peripheral surface (tapered surface 211) of the insertion portion 210 and the inner peripheral surface 122 of the outer part 100 form a concentric circle. Thereby, the tube 2 is continuously clamped by the outer part 100 and the inner part 200 in the circumferential direction, and the compressive force which the tube 2 receives by this becomes substantially constant in the circumferential direction. Therefore, since the tube 2 is in liquid-tight contact with the outer peripheral surface of the insertion portion 210, even if the internal pressure of the tube 2 increases, the liquid material in the tube 2 may leak from the contact interface between the tube 2 and the insertion portion 210. Absent.

  Further, it can be repeatedly connected to the tube 2 that is frequently connected / separated like a PEG tube without any problem.

  Furthermore, if the inner diameter of the opening 121 of the outer part 100, the outer diameter of the insertion portion 210, the taper angle of the tapered surface 211, and the like are appropriately set, a connecting member that shares the tubes 2 having different inner diameters, outer diameters, and thicknesses. It is also possible to connect with.

As shown in FIG. 1, the outer diameter of the distal end (the end opposite to the base end 202) of the insertion portion 210 is D2 _top , the maximum outer diameter of the tapered surface 211 of the insertion portion 210 is D2 _max , and the opening 121 of the outer part 100. It is preferable that D2 _top <D1 _min <D2 _max is satisfied, where D1 _min is the minimum inner diameter. When this preferable dimensional condition is satisfied, when the insertion portion 210 and the opening 121 of the outer part 100 are brought closer, the tube 2 is connected by the tapered surface 211 of the insertion portion 210 and the inner peripheral surface 122 of the opening 121 of the outer part 100. It can be securely clamped. Therefore, the tube 2 and the connection member 10 can be connected in a liquid-tight manner with higher connection strength.

  When the insertion part 210 of the inner part 200 is inserted into the opening 121 of the outer part 100, it is preferable that the outer part 100 and the tapered surface 211 of the insertion part 210 substantially contact each other with a line. “Substantially contact with a line” means that the outer part 100 and the tapered surface 211 are in contact with each other in a narrow region in the cross-sectional view including the central axis 10a as shown in FIG. Thereby, since the clamping force with respect to the tube 2 can be concentrated on a small area | region, the tube 2 and the connection member 10 can be liquid-tightly connected by higher connection strength. In order to make the outer part 100 and the taper surface 211 of the insertion part 210 substantially contact with each other by a line, for example, the inner peripheral surface 122 surrounding the opening 121 of the outer part 100 is made a cylindrical surface or the taper surface of the insertion part 210. A tapered surface having a taper angle different from that of 211 may be used.

  As shown in FIG. 1, the inner peripheral surface 122 of the opening 121 of the outer part 100 preferably has a tapered surface having a large diameter on the base end 202 side of the inner part 200. Thereby, in the cross-sectional view along the plane including the central axis 10a, the edge (at the base end 202 side) of the end edges 125 and 126 located at both ends of the inner peripheral surface 122 of the outer part 100 in the direction of the central axis 10a ( The inner edge 125) forms an obtuse angle, and the edge (outer edge) 126 opposite to the base end 202 forms an acute angle. In this case, when the taper angle of the taper surface of the inner peripheral surface 122 of the outer part 100 is θ1, and the taper angle of the taper surface 211 of the insertion portion 210 is θ2, it is preferable to satisfy θ1 <θ2. Thereby, as shown in FIG. 4, the tube 2 covering the tapered surface 211 of the insertion portion 210 comes into contact with the inner edge 125 that forms an obtuse angle among the edges 125 and 126 on both sides of the inner peripheral surface 122. Since the inner edge 125 has a relatively strong strength by forming an obtuse angle, a large compressive force can be applied to the tube 2. Therefore, the tube 2 and the connection member 10 can be connected in a liquid-tight manner with higher connection strength. Further, since the taper surface 211 of the insertion portion 210 has a relatively large taper angle θ2, the taper surface 211 of the insertion portion 210 and the inner periphery of the outer part 100 can be inserted without inserting the insertion portion 210 into the tube 2 deeply. The tube 2 can be clamped with the surface 122. Therefore, connection workability is improved.

The minimum inner diameter D1 _min of the opening 121 of the outer part 100 is preferably equal to or larger than the outer diameter DT _out of the end inserted into the opening 121 of the tube 2 (that is, D1 _min ≧ DT _out ). Thereby, since the tube 2 can be easily inserted into the opening 121, connection workability is improved. However, since the tube 2 is generally flexible, even if D1 _min <DT _out , the tube 2 may be deformed and inserted into the opening 121. In such a case, In some cases, the tube 2 and the connecting member 10 can be connected.

Outer diameter D2 _top of the distal end of the insertion portion 210 of the inner part 200, that the same or less than this as the opening diameter DT _in the side to be inserted into the opening 121 of the tube 2 (i.e., D2 _top ≦ DT _in) are preferred. Thereby, since the insertion part 210 can be easily inserted in the tube 2, connection workability | operativity improves. However, since the tube 2 generally has elasticity, there is a case where the insertion portion 210 can be inserted into the tube 2 by extending the tube 2 in the circumferential direction. In such a case, the tube 2 and the connecting member 10 are connected. Is possible.

  In the present invention, the materials of the outer part 100 and the inner part 200 are not particularly limited, but for example, a resin material is preferable because it can be easily molded into a desired shape by injection molding or the like. Specifically, for example, polypropylene and polycarbonate can be used. Further, the outer part 100 and / or the inner part 200 are transparent so that the state of the liquid material flowing in the connection member 10 and the connection state between the tubes 1 and 2 and the connection member 10 can be easily observed. Or it is preferable to have translucency.

  The above-described embodiment is an example, and the present invention is not limited to this, and various modifications can be made.

  For example, in the above embodiment, the tapered surface 211 is formed on the outer peripheral surface of the distal end of the insertion portion 210. However, the present invention is not limited to this, and for example, the outer peripheral surface of the distal end of the insertion portion 210 is the central axis 10a. It may be a cylindrical surface having a constant outer diameter in the direction. Even in this case, the tube 2 may be disposed inside the opening 121 of the outer part 100 by making the inner peripheral surface 122 of the opening 121 of the outer part 100 a tapered surface having a large diameter on the base end 202 side of the inner part 200. It can be held between at least a part of the peripheral surface 122 and the insertion part 210 of the inner part 200.

  In the above embodiment, the outer part 100 and the inner part 200 are connected by the screw mechanism including the female screw 111 and the male screw 203, but the present invention is not limited to this. The outer part 100 is arranged such that the opening 121 of the outer part 100 and the insertion part 210 of the inner part 200 are coaxial, and the opening 121 of the outer part 100 and the insertion part 210 of the inner part 200 can be approached and separated. Any connection mechanism that can connect the inner part 200 to the inner part 200 may be used. As such a connection mechanism, for example, a guide structure that can move the outer part 100 relative to the inner part 200 in the direction of the central axis 10a (for example, a groove and a protrusion that fits into the groove) is used. it can. In this case, in order to maintain the state in which the tube 2 is sandwiched between the outer part 100 and the inner part 200, the relative position of the outer part 100 with respect to the inner part 200 in the direction of the central axis 10a can be temporarily fixed. It is preferable to provide a mechanism (for example, a ratchet mechanism or a fixing mechanism using a screw).

  Although the case where enteral nutrition therapy using a PEG tube is performed has been described in the above embodiment, the connection member of the present invention can be used for other applications. For example, it can also be used when performing enteral nutrition therapy or parenteral nutrition therapy in which liquid substances such as nutrients, liquid foods, or drugs stored in a container are administered to a patient via a nutrition set or infusion set . In this case, the inner part 200 can be integrated with the outflow port of the container in which the liquid material is stored. Alternatively, the base end 202 of the inner part 200 and the outflow port of the container may be connected via a tube or the like. Further, the upstream end of the tube constituting the nutrition set or the infusion set can be inserted into the opening 121 of the outer part 100. In this case, there is no particular limitation on the container, the outflow port provided in the container, the nutrition set or the infusion set communicating with the outflow port.

  In the above embodiment, when the tube 2 is sandwiched between the outer part 100 and the inner part 200, a rotational force around the central axis 10a is applied to the tube 2. In order to prevent the tube 2 from being wrinkled or damaged by the rotational force, a mechanism for preventing the rotational force from being applied to the tube 2 may be provided. Such a mechanism can be realized, for example, by configuring the outer part 100 with two parts so that the rotation of the female screw 111 around the central axis 10 a is not transmitted to the inner peripheral surface 122.

  The shapes and dimensions of the outer part 100 and the inner part 200 constituting the connecting member 10 can be changed as appropriate. For example, the outer part 100 and the inner part 200 can be gripped with fingers of both hands and can be easily rotated, for example, the outer peripheral surface of the cylindrical portion 110 of the outer part 100 and / or the base end 202 of the inner part 200. An uneven pattern for preventing slippage may be provided on the outer peripheral surface, or the outer peripheral surface may be a polygonal column surface.

  The field of application of the present invention is not particularly limited, and can be widely used in various fields such as medicine, food, and chemistry where a hollow tube needs to be connected.

FIG. 1 is a cross-sectional view taken along the central axis of a connection member according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing one step of the tube connecting method using the connecting member according to the embodiment of the present invention. FIG. 3 is a cross-sectional view showing one step of the tube connecting method using the connecting member according to the embodiment of the present invention. FIG. 4 is a cross-sectional view showing one step of the tube connecting method using the connecting member according to the embodiment of the present invention.

Explanation of symbols

1, 2 Tube 10 Connection member 10a Central axis 100 Outer part 110 Cylindrical part 111 Female screw 120 Holding plate 121 Opening 122 Inner peripheral surface 125, 126 Edge 200 Inner part 201 Through hole 202 Base end 203 Male screw 210 Insertion part 211 Taper surface

Claims (6)

A connecting member for connecting a hollow tube having flexibility,
An outer part with a circular opening,
An inner part having an insertion portion with an outer peripheral surface having a circular cross-sectional shape, and having a through-hole penetrating the insertion portion;
The outer part so that the opening of the outer part and the insertion part of the inner part are coaxial, and the opening of the outer part and the insertion part of the inner part can be approached and separated. And a connection mechanism for connecting the inner parts,
The tube is configured to be sandwiched between at least a part of the inner peripheral surface of the opening of the outer part and the insertion portion of the inner part,
The outer part or the inner part has transparency or translucency,
The outer peripheral surface of the insertion portion has a taper surface with a taper angle θ2, the diameter of which decreases as it approaches the tip of the insertion portion,
The inner peripheral surface of the opening of the outer part has a cylindrical surface or a tapered surface having a taper angle θ1 that is larger on the proximal end side of the inner part and smaller than the taper angle θ2.
When the insertion part of the inner part is inserted into the opening of the outer part so that the outer part and the insertion part can sandwich a very small area of the tube, the outer part and the insertion part A connecting member, wherein the taper surface of the contact member substantially contacts with a line. When the outer diameter of the tip of the insertion part is D2 _top , the maximum outer diameter of the tapered surface of the insertion part is D2 _max , and the minimum inner diameter of the opening of the outer part is D1 _min , D2 _top <D1 _min < The connecting member according to claim 1, wherein D2 _max is satisfied. The connection member according to claim 1 or 2, wherein the connecting mechanism comprises a screw. A connection method for connecting the connecting member according to any one of claims 1 to 3 and a flexible hollow tube so that the through hole of the inner part and the tube communicate with each other,
Inserting one end of the tube into the opening of the outer part;
By moving the outer part and the inner part relatively in a direction in which the opening of the outer part and the insertion portion of the inner part approach each other, the tube is moved to the inner periphery of the opening of the outer part. It is clamped between at least a part of the surface and the insertion part of the inner part. Minimum inner diameter D1 _min of the opening of the outer part is the connection method according to equal to or greater than 4. the outer diameter DT _out of the one end of the tube. The insertion portion of the tip outer diameter D2 _top of the connection method according to the inner diameter DT _in equal to or smaller claim 4 and one end of said tube in said part.

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