JP2017158704A - Medical connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical connector in which liquid dripping hardly occurs when a tube body and the connector are disconnected.SOLUTION: A connector 101 includes a connector body 110 having an opening 113 through which a tube body is inserted into one end part, and an inner cylinder part 120 provided in the connector body 110, which is a fluid channel where liquid flows. An inner wall 114 of the connector body 110 can engage with an outer wall of the tube body inserted through the opening 113, and the other end of the connector body 110 can be connected to a transfusion tube 130. The inner cylinder part 120 is reversibly compressed in an axial direction by the insertion of the tube body into the opening 113.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a medical connector, and more particularly to a medical connector that can be used in an infusion circuit or the like.

  In medical devices, there are various connection portions such as devices and tubes, tubes and syringes, and tubes. Connectors are used for these connecting portions. Even in the enteral nutrition method in which nutrition and medicine are administered to a patient without oral administration, a catheter or the like inserted into the patient and a liquid supply container such as an enteral nutrient are connected via a connector. (For example, see Patent Document 1).

  In recent years, due to an increase in medical equipment, erroneous connection of medical equipment has become a major problem. For this reason, new connector standards are being defined in order to prevent erroneous connection of medical devices. Specifically, medical devices are divided into six categories and different categories of medical devices are required to be connectors that cannot be connected to each other. For example, in the field of nutrition, it is standard that a connector is provided at the supply-side downstream end and the patient-side upstream end is a tube inserted into the connector.

JP2013-212135A

  However, since the connector into which the tubular body is inserted has a diameter larger than that of the tubular body and expands toward the opening side, dripping tends to occur compared to the tubular body. In particular, the connector at the downstream end of the supply side is often held downward after being removed, and dripping from the connector is a big problem. Enteral nutrition circuits are often used for a long period of time, and if a highly nutritious infusion is poured, miscellaneous bacteria may propagate and cause infections.

  Therefore, development of a connector that satisfies the new standard and can suppress the occurrence of these problems is demanded.

  An object of the present disclosure is to realize a connector in which dripping does not easily occur when the connection between the tube body and the connector is disconnected.

  A first aspect of the connector of the present disclosure includes a connector main body having an opening into which a tubular body is inserted at one end, and an inner cylinder portion provided in the connector main body and serving as a fluid passage through which a fluid flows. The inner wall of the connector body can be fitted to the outer wall of the tube inserted through the opening, the other end of the connector body can be connected to the infusion tube, and the inner cylinder is the opening of the tube By being inserted into the part, it is reversibly compressed in the axial direction.

  In the connector according to the first aspect, when the tube body is pulled out, the inner cylinder portion that has been reversibly compressed expands again. For this reason, when the connection between the tubular body and the connector is removed, the dripping from the connector can be suppressed.

  1st aspect of a connector WHEREIN: The front-end | tip of an inner cylinder part can be engaged with the edge part of a tubular body. In this case, the distal end of the inner cylinder portion can be inserted into the lumen of the tube body, or the end portion of the tube body can be inserted inside. By adopting such a configuration, when the tube body and the connector are connected, the distal end portion of the inner cylinder portion and the end portion of the tube body are compared to the case where the distal end of the inner cylinder portion is not engaged with the end portion of the tube body. It is possible to make it difficult for the liquid to leak out.

  In the first aspect of the connector, the inner cylinder portion includes a proximal end portion, a distal end portion, and a deformable portion that is provided between the proximal end portion and the distal end portion and is elastically deformable in the axial direction of the connector. It can be. In this case, the deformable member can be an expandable / contractible bellows-like member. By setting it as such a structure, an inner cylinder part can be expanded-contracted easily and the dripping from a connector can be suppressed.

  In the first aspect of the connector, the connector main body has a first portion that can be fitted to the outer wall of the tubular body inserted from the opening, and a second portion in which the deformed portion of the inner cylinder portion is accommodated. The inner diameter of the second portion may be larger than the inner diameter of the first portion. By setting it as such a structure, a deformation | transformation part can be deform | transformed smoothly.

  In this case, the connector main body has a third portion provided on the base end side relative to the second portion, and the third portion has an inner diameter larger than that of the second portion, The inner cylinder portion is provided on the base end side than the deformation portion, has a base end portion having a larger outer diameter than the deformation portion, and the end surface on the tip end side of the base end portion is It can make it contact | abut with a level | step-difference part. By setting it as such a structure, the movement to the front-end | tip direction of an inner cylinder part can be controlled easily.

  Further, the axial length of the tip portion can be longer than the axial length of the first portion. By setting it as such a structure, a front-end | tip part can be functioned as a guide at the time of inserting a tubular body.

  1st aspect of a connector WHEREIN: The front-end | tip of an inner cylinder part can be set as the structure which protrudes from the opening part. By setting it as such a structure, the front-end | tip of an inner cylinder part can be functioned as a guide at the time of inserting a tubular body.

  A second aspect of the connector according to the present disclosure includes a connector main body having an opening into which a tubular body is inserted at one end, and an inner cylinder portion that is provided in the connector main body and serves as a fluid passage through which a fluid flows. The inner wall of the connector main body can be fitted with the outer wall of the tube inserted from the opening, the other end of the connector main body can be connected to the infusion tube, and the tip of the inner cylinder is the tube The case where the tubular body is inserted into the connector body is located on the proximal end side than the case where the tube body is removed from the connector body.

  According to the connector of the present disclosure, dripping can be made difficult to occur when the connection between the tube body and the connector is disconnected.

It is sectional drawing which shows the connector which concerns on one Embodiment. It is sectional drawing which shows the state by which the tubular body was inserted. It is sectional drawing which shows the state which returned to the expansion | extension state when the inner cylinder part was clamped. It is sectional drawing which shows the inner cylinder part which concerns on one Embodiment. It is the top view which looked at the inner cylinder part which concerns on one Embodiment from the end surface of the front end side. It is a perspective view which shows the inner cylinder part which concerns on one Embodiment. It is sectional drawing which shows the modification of a front-end | tip part. It is sectional drawing which shows the modification of a front-end | tip part. It is sectional drawing which shows the connector which concerns on a modification. It is sectional drawing which shows the state by which the tubular body was inserted. It is sectional drawing which shows the state which returned to the expansion | extension state when the inner cylinder part was clamped. It is a perspective view which shows the inner cylinder part which concerns on a modification. It is the top view which looked at the inner cylinder part which concerns on a modification from the end surface of the front end side. It is a perspective view which shows the inner cylinder part which concerns on a modification. It is sectional drawing which shows the modification of a front-end | tip part. It is sectional drawing which shows the modification of a front-end | tip part. It is sectional drawing which shows the connector which concerns on a modification. It is sectional drawing which shows the state by which the tubular body was inserted. It is sectional drawing which shows the state which returned to the expansion | extension state when the inner cylinder part was clamped.

  The present disclosure describes a preferable aspect of an enteral nutrition connector, particularly as an enteral nutrition connector that satisfies the international standard (ISO80369-3). As shown in FIG. 1, the connector 101 of this embodiment is a medical connector, and includes a connector main body 110 and an inner cylinder portion 120 provided in the connector main body 110. The connector main body 110 has an opening 113 provided at one end and into which a tube is inserted, and a tube 130 is connected to the opposite end. In the vicinity of the opening 113, the inner wall 114 of the connector main body 110 is in contact with the outer wall of the tubular body inserted from the opening 113 and serves as a liquid-tight fitting surface. The inner cylindrical portion 120 serves as a fluid passage through which fluid such as infusion flows and is reversibly compressed in the axial direction by being inserted into the opening 113 of the tubular body.

  FIG. 2 shows a state in which the tube body 201 is inserted into the connector 101. The tube body 201 includes an insertion tube portion 210 to be inserted into the opening 113 of the connector main body 110, and a lock nut that is provided around the insertion tube portion 210 and engages with a screw thread 116 provided on the outer surface of the connector main body 110. The outer cylinder part 220 which is. In FIG. 2, a configuration in which the outer cylindrical portion 220 of the tube body 201 is engaged with the thread 116 is shown.

  The outer wall 212 of the insertion tube portion 210 is a tapered surface that fits with the inner wall 114 of the connector main body 110 in the vicinity of the opening 113, and the outer wall 212 of the insertion tube portion 210 and the inner wall 114 of the connector main body 110 in the vicinity of the opening 113. And are liquid-tightly fitted. The lumen of the insertion cylinder part 210 communicates with the lumen of the inner cylinder part 120, and the liquid passes through the inside.

  As shown in FIG. 2, when the tube body 201 is inserted into the opening 113 of the connector 101, the end portion of the inner cylinder portion 120 comes into contact with the end portion of the insertion tube portion 210 of the tube body 201, and the inner tube portion 120. Is reversibly compressed and is compressed in the connector body 110. As a result, the distal end of the inner cylindrical portion 120 is positioned closer to the proximal end when the tube body 201 is inserted into the connector body 110 than when the tube body 201 is removed from the connector body 110.

  FIG. 2 shows the liquid level 150 in the connector 101 in a state where the upstream tube 130 is closed after flowing the liquid. By closing the tube, the liquid does not flow from the upstream, and the liquid level 150 in the connector 101 becomes difficult to move downstream. The tube 130 may be closed by pressing with hands or forceps, but it is preferable to provide a clamp. In this state, when the tubular body 201 is removed from the connector 101, the inner cylindrical portion 120 expands again as shown in FIG. Even when the connector is held downward, since the liquid level 150 exists in the extended inner cylinder portion 120, the liquid level is retracted relative to the inner cylinder portion, so that the occurrence of dripping can be suppressed. it can.

  4 to 6 show the inner cylinder portion 120 in an enlarged manner. As shown in FIGS. 4-6, the inner cylinder part 120 has the base end part 121, the deformation | transformation part 122, and the front-end | tip part 123 in order from the base end side. The base end portion 121 is thicker than other portions, and is provided so that the outer peripheral surface is fitted to the inner peripheral surface of the base end portion of the connector main body 110. The deformation part 122 is provided so as to expand and contract when the tube body 201 is inserted from the opening 113 and to expand when the tube body 201 is pulled out. In the present embodiment, the deforming part 122 is formed of a bellows-like member. The distal end portion 123 is provided so as to be engageable with an end portion of the insertion tube portion 210 of the tube body 201 inserted from the opening portion 113. The phenomenon of liquid leakage from the tip of the inner cylinder and the end of the tube during use replaces the air between the inner peripheral surface of the connector body and the outer peripheral surface of the inner cylinder and the liquid flowing through the flow path. This is thought to be caused by However, with the configuration as described above, the replacement of air and liquid is less likely to occur, and the liquid tends to flow from upstream to downstream rather than leaking to the inner peripheral surface of the connector body at the time of connection. Therefore, liquid leakage at the time of connection is less likely to occur. In addition, the bellows member may be in a wave state in a cross section cut in the axial direction, and may be configured to have a biasing force to return from the compressed state to the stretched state, and the bellows portion is provided in a spiral shape. It can also be.

  In the connector of the present embodiment, the inner diameter of the base end side of the connector main body 110 is substantially equal to the outer diameter of the base end portion 121 of the inner cylindrical portion 120, and the inner cylindrical portion 120 is inserted into the connector main body 110. Can be assembled. The connector main body 110 may be fitted with the inner peripheral surface on the base end side and the outer peripheral surface of the base end portion 121 of the inner cylinder portion 120. In addition, a protrusion 115 is provided on the inner peripheral surface of the base end side of the connector main body 110 to make it difficult to remove the base end portion 121 of the inner cylinder portion 120. The protrusion 115 is provided so as to restrict the movement of the inner cylinder portion 120 toward the opening 113 of the connector main body 110, and may be an annular shape or a plurality of protrusions. The end portion on the proximal end side of the inner cylindrical portion 120 can be formed into a shape having a chamfered R. With such a configuration, it is possible to easily insert the inner cylinder portion 120 into the connector main body 110 during assembly.

  Not only in such a configuration, the inner cylinder portion 120 only needs to be fixed at a predetermined position in the connector main body 110. For example, a recess can be provided in the connector main body 110, and the base end portion 121 of the inner cylinder portion 120 can be fitted into the recess and fixed. Moreover, the inner cylinder part 120 can also be fixed in the connector main body 110 using an adhesive agent or the like.

  When the tubular body 201 is extracted from the connector 101, the deformable portion 122 of the inner cylinder portion 120 that has been reversibly compressed is configured as a deformable portion that can be elastically deformed so as to have an urging force that returns to the original expanded state. It is preferable that

  When the tubular body 201 is inserted and the deformable portion 122 is in a compressed state, it is preferable that the deformable portion 122 and the distal end portion 123 are not in contact with the inner peripheral surface of the connector main body 110. With such a configuration, when the tubular body 201 is extracted, the deformable portion 122 can easily shift from the compressed state to the expanded state.

  When the tube body 201 is removed from the connector 101, the liquid level on the connector 101 side swells downstream due to the influence of internal pressure and gravity even if the supply side tube 130 is clamped on the upstream side of the connector 101. If the expansion of the liquid surface to the downstream side exceeds the limit, dripping occurs. In general, the diameter of the connector lumen is larger than that of the tube body and expands outward.

  On the other hand, in the connector 101 of this embodiment, when the tube body 201 is removed, the inner cylinder portion 120 that has been reversibly compressed is expanded again. For this reason, as shown in FIG. 3, the liquid level on the connector 101 side can be kept inside the inner cylindrical portion 120, and the occurrence of dripping can be suppressed.

  FIG. 1 shows an example in which the distal end of the expanded inner cylinder 120 protrudes from the opening 113. If the tip of the inner cylinder 120 protrudes from the opening 113 in the extended state, it can function as guide means for guiding the insertion of the tube body into the opening 113. However, in the case of a standard size connector, if the length of the inner cylindrical portion 120 changes by about 0.5 mm between the expanded state and the compressed state, an effect of suppressing dripping can be obtained. Therefore, the distal end of the inner cylinder 120 does not have to protrude from the opening 113 in the extended state.

  In this embodiment, the structure which has the flange part 124 which protruded in the direction which the front-end | tip part 123 of an inner cylinder part cross | intersects an axial direction was shown. With this configuration, the inner cylinder 120 can be centered. The flange portion 124 may be in contact with the inner peripheral surface of the connector main body 110, but is preferably not in contact. By setting it as such an aspect, the inner cylinder part 120 can make it easy to return from a compression state to an expansion | extension state. However, the flange portion 124 may not be provided. Moreover, although the deformation | transformation part 122 showed the structure extended from the base end part 121, it can also be set as the structure by which the non-compression part is provided between the base end part 121 and the deformation | transformation part 122. FIG.

  In FIG. 2, an example in which the distal end portion 123 of the inner cylinder portion 120 is inserted into the inner cavity of the insertion cylinder portion 210 is shown. By doing in this way, the advantage that the front-end | tip of the tubular body 201 is guided and insertion becomes easy is acquired. Moreover, if the inner cylinder part 120 and the insertion cylinder part 210 are connected in a liquid-tight manner, there is an advantage that the infusion can pass smoothly through the connector. However, since the outer wall 212 of the insertion cylinder part 210 and the inner wall 114 of the opening part 113 fit liquid-tightly, the inner cylinder part 120 and the insertion cylinder part 210 do not need to be liquid-tightly connected. Although the example in which the distal end portion of the inner cylinder portion 120 is inserted into the inner cavity of the insertion cylinder portion 210 has been shown, the distal end portion of the inner cylinder portion 120 and the distal end portion of the insertion cylinder portion 210 are in contact with each other and engaged. If so, the distal end portion of the inner cylinder portion 120 may not be inserted into the lumen of the insertion cylinder portion 210.

  For example, as shown in FIG. 7, the distal end portion of the insertion tube portion 210 can be inserted into the lumen of the inner tube portion 120. Moreover, as shown in FIG. 8, it can also be set as the structure which the front-end | tip part of the inner cylinder part 120 and the edge part of the insertion cylinder part 210 fit.

  Moreover, the front-end | tip part of an inner cylinder part can be comprised so that it may be hard to deform | transform rather than a deformation | transformation part. By adopting such a configuration, since the member is harder than the deforming portion, it is difficult to be deformed even if the tube body is pushed in, and the tip end portion of the inner cylinder portion and the end portion of the tube body can be easily connected. it can.

  9 to 14 show modifications of the connector. The connector 101A of this modification includes an inner cylinder portion 120A having a cylindrical tip portion 123A. The outer diameter φ3 of the distal end portion 123A is smaller than the outer diameter φ2 of the deforming portion 122A, and the outer diameter φ2 of the deforming portion 122A is smaller than the outer diameter φ1 of the base end portion 121A. It is not limited to the embodiment. The outer diameter φ2 of the deforming portion 122A is the maximum diameter of the deforming portion 122A made of a bellows-like member. In this modification, the connector main body 110A includes, from the distal end side, a first portion 117A that accommodates the distal end portion 123A of the inner cylinder portion 120A, a second portion 117B that accommodates the deformable portion 122A, and a proximal end portion 121A. And a third portion 117C to which the tube 130 is connected.

  The third portion 117C of the connector main body 110A has an inner diameter that is substantially equal to the proximal end portion 121A of the inner cylindrical portion 120A and the tube 130. The second portion 117B has an inner diameter that is smaller than the outer diameter of the base end portion 121A and larger than the outer diameter of the deforming portion 122A. 117 A of 1st parts are smaller than the outer diameter of the deformation | transformation part 122A, and have an internal diameter substantially equal to or larger than the outer diameter of the front-end | tip part 123A. The first portion 117 </ b> A is a tapered surface that fits with the outer wall of the insertion tube portion 210 of the tube body 201.

  In the connector 101A of this modification, the inner diameter of the second portion 117B is larger than the outer diameter of the deforming portion 122A. For this reason, compression and expansion / contraction of the deformable portion 122A accommodated in the second portion 117B is facilitated. On the other hand, even if the inner diameter of the second portion 117B is larger than the outer diameter of the deforming portion 122A, the first portion 117A can be easily sized to fit the insertion tube portion 210 of the tube body 201. .

  The length of the cylindrical tip portion 123A of the inner cylinder portion 120A is preferably longer than the length of the first portion 117A in the axial direction. Thereby, the front-end | tip of the inner cylinder part 120 protrudes from the opening part 113, and 120 A of inner cylinder parts can be functioned as a guide. In FIG. 9, the minimum value of the inner diameter of the tapered first portion 117A is substantially equal to the outer diameter of the tip portion 123A, and the inner surface of the first portion 117A and a part of the outer surface of the tip portion 123A are in contact with each other. ing. Thus, if the inner surface of the first portion 117A and the outer surface of the tip portion 123A are in contact with each other and slide, the inner cylinder portion 120A can be easily aligned. However, it is possible to prevent the inner surface of the first portion 117A from contacting the outer surface of the distal end portion 123A.

  The inner diameter of the third portion 117C is the same as or slightly smaller than the outer diameter of the base end portion 121A of the inner cylindrical portion 120A, and the outer peripheral surface of the base end portion 121A and the outer peripheral surface of the third portion 117C are fitted. ing. Further, since the third portion 117C is larger than the second portion 117B, a step is formed at the boundary between the third portion 117C and the second portion 117B. This level | step difference functions as a flange which controls that 121 A of base end parts of the inner cylinder part 120A move to a front end side. Further, the tube 130 is inserted from the opening on the proximal end side of the third portion 117C, and is welded or bonded to the first portion 117C. For this reason, the movement of the proximal end portion 121 </ b> A toward the proximal end side is regulated by the end face of the tube 130. Therefore, in this modification, the inner cylinder portion 120A can be easily and firmly fixed to the connector main body 110A, and the connector main body can be made compact because it is not necessary to provide a flange. The fixing of the proximal end portion 121A of the inner cylindrical portion 120A on the proximal end side is not limited to the fixing on the end surface of the tube 130, but the third end 117C has a proximal end portion 121A of the inner cylindrical portion 120A. A flange may be provided on the proximal end side.

  In this modification, as shown in FIG. 15, the distal end portion of the insertion tube portion 210 can be inserted into the lumen of the inner tube portion 120A. Moreover, as shown in FIG. 16, it can also be set as the structure which the front-end | tip part of 120 A of inner cylinders and the edge part of the insertion cylinder part 210 fit.

  Although the material of the connector main body of this embodiment and the modification is not particularly limited, it is preferably formed of a semi-rigid or hard material that satisfies the ISO standard. Specifically, polyethylene, polypropylene, polyvinyl chloride, polycarbonate resin, acrylic-butadiene-styrene (ABS) resin, or the like can be used.

  The inner cylinder part is formed of a material having elasticity so that it can expand and contract. For example, polyethylene or polypropylene can be used. Also, rubber or elastomer can be used. Furthermore, an urging member such as a coil spring may be provided between the proximal end portion and the distal end portion of the inner cylinder portion, and the deforming portion may be configured to compensate for the urging force for returning from the compressed state to the expanded state. Thereby, when the connection between the connector and the tubular body is released, the inner tube portion can easily return from the compressed state to the expanded state.

  Although the example using the inner cylinder part which has a deformation | transformation part which is a bellows-like member which can be expanded-contracted was shown, the deformation | transformation part of an inner cylinder part uses the member which can be expanded-contracted not only in a bellows-like member but in the axial direction of the connector main body 110 can do. Moreover, it can also be set as the structure which the inner cylinder part will be in the compression state which swelled in the direction which cross | intersects an axis | shaft by insertion of a tubular body, and will return to the original expansion | extension state after disconnecting with a tubular body. As a specific example, a tubular inner cylinder 120B having elasticity can be provided as in the modified examples shown in FIGS. The inner cylinder part 120B of the connector 101B according to this modification is pressed by the tip of the insertion cylinder part 210 and swells in a direction intersecting the axis of the connector main body 110 to be compressed and deformed. Return. If the deformation amount of the inner cylinder portion 120B is about 0.5 mm or more, an effect of suppressing dripping can be obtained. The inner cylinder portion 120B can be formed of, for example, polyethylene or polypropylene.

  FIG. 18 shows an example in which the tip of the inner cylinder part 120B is inserted into the inner cavity of the insertion cylinder part 210. However, the distal end of the inner cylinder part 120B is not inserted into the inner cavity of the insertion cylinder part 210, and the end surfaces are in contact with each other, or the distal end of the insertion cylinder part 210 is connected to the inner cylinder part 120B. It can also be configured to be inserted into the lumen.

  The female connector of this embodiment can suppress the occurrence of dripping when the tubular body is pulled out in an infusion circuit such as enteral nutrition. Moreover, it can also be used for connection of circuits other than the infusion circuit. Furthermore, not only when the female connector is disposed on the supply side, but also when the female connector is disposed on the patient side, the occurrence of dripping can be suppressed.

  The female connector of the present disclosure hardly causes dripping even when provided on the supply side, and is particularly useful as a connector used in an infusion circuit such as enteral nutrition.

DESCRIPTION OF SYMBOLS 101 Connector 101A Connector 101B Connector 110 Connector main body 110A Connector main body 113 Opening part 114 Inner wall 115 Protrusion 116 Screw part 117A 1st part 117B 2nd part 117C 3rd part 120 Inner cylinder part 120A Inner cylinder part 120B Inner cylinder part 121 Base end part 121A Base end part 122 Deformation part 122A Deformation part 123 Front end part 123A Front end part 124 Flange part 130 Tube 150 Liquid surface 201 Tube body 210 Insertion cylinder part 212 Outer wall 220 Outer cylinder part

Claims (12)

A connector body having an opening into which the tube is inserted at one end;
An inner cylinder portion provided in the connector body and serving as a fluid passage through which a fluid flows;
The inner wall of the connector body can be fitted with the outer wall of the tubular body inserted from the opening,
The other end of the connector body can be connected to an infusion tube,
The inner cylinder portion is a connector that is reversibly compressed in the axial direction by insertion of the tubular body into the opening.   The connector according to claim 1, wherein a distal end of the inner cylinder portion is engaged with an end portion of the tubular body.   The connector according to claim 2, wherein a distal end of the inner cylinder portion is inserted into a lumen of the tubular body.   The connector according to claim 2, wherein the inner cylindrical portion is capable of inserting an end portion of the tubular body into the inner cylindrical portion.   The inner cylinder portion includes a proximal end portion, a distal end portion, and a deformable portion provided between the proximal end portion and the distal end portion and elastically deformable in the axial direction of the connector. The connector according to any one of the above.   The connector according to claim 5, wherein the tip portion is less likely to be deformed than the deformable portion.   The connector according to claim 5, wherein the deformable portion is an expandable / contractible bellows member.   The connector main body has a first portion that can be fitted to the outer wall of the tubular body inserted from the opening, and a second portion in which the deformable portion is accommodated. The connector according to claim 5 or 6, wherein an inner diameter is larger than an inner diameter of the first portion. The connector main body has a third portion provided on the proximal end side with respect to the second portion,
The third portion has a larger inner diameter than the second portion, and has a step portion at the boundary with the second portion,
The base end portion has an outer diameter larger than that of the deformation portion,
The connector according to claim 8, wherein an end surface on a distal end side of the base end portion is in contact with the stepped portion.   The connector according to claim 8 or 9, wherein an axial length of the distal end portion is longer than an axial length of the first portion.   The connector according to any one of claims 1 to 10, wherein a tip end of the inner cylinder portion protrudes from the opening. A connector body having an opening into which the tube is inserted at one end;
An inner cylinder portion provided in the connector body and serving as a fluid passage through which a fluid flows;
The inner wall of the connector body can be fitted with the outer wall of the tubular body inserted from the opening,
The other end of the connector body can be connected to an infusion tube,
The tip of the inner cylinder part is a connector located closer to the base end when the tube is inserted into the connector body than when the tube is removed from the connector body.

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