JP6543511B2 - Connection structure - Google Patents

Description

  The present invention relates to a connection structure. More particularly, the present invention relates to a connection structure between a first member and a second member that needs to be fluidly connected.

  2. Description of the Related Art In a medical device or the like for supplying a fluid such as a body fluid or a drug, a structure is known in which one member is connected to the other member and fluid can be supplied from one member to the other member. For example, Patent Document 1 includes a hollow cylindrical female connector, a male connector inserted into the female connector, and a cylindrical lock-type fastener that locks the female connector and the male connector in a connected state. Medical devices are disclosed. In the male connector of this medical instrument, the connection insertion portion to be inserted into the female connector is formed in a tapered shape. In the female connector, a taper corresponding to the taper of the connection insertion portion of the male connector is formed on the inner peripheral surface of the hollow portion into which the male connector is inserted. In the medical device of Patent Document 1, the connection insertion portion of the male connector is inserted into the hollow portion of the female connector to perform taper connection. After that, move the lock type fixing tool from the male connector side to the female connector side, and screw the female screw section formed on the inner peripheral surface of the lock type fastener and the male screw section formed on the outer periphery of the female connector. Lock the male and female connectors.

Utility model registration 3137386 gazette

  However, as in Patent Document 1, when forming a taper of an angle corresponding to the other taper in one of the male connector and the female connector and performing taper connection, for example, when the taper angle of the female connector changes, the taper It becomes impossible to connect and it becomes difficult to connect fluid-tightly when flowing fluid. Therefore, it is necessary to use a female connector having the same taper angle for a male connector having a certain taper angle, and only one type of female connector can be used for a certain male connector, and the versatility is low.

  Therefore, in view of such problems, in the connection structure between the first member and the second member that needs to be fluid-tightly connected, a plurality of different types of second members can be used with one kind of first member. An object of the present invention is to provide a highly versatile connection structure that can correspond to members.

  The connection structure of the present invention comprises a first member having a first member-side main body and a connection portion, and a second member having a second member-side main body and a connected portion connected to the connection portion. In the connection structure, the first member is provided with a first member side connecting portion on the first member side main body, the first member side main body has a first member side hollow portion, and the connection portion Has a first member side opening communicating with the first member side hollow portion, and a contact portion contacting the connected portion, and the second member is connected to the first member side connecting portion A second member side connecting portion is provided, the second member side main body has a second member side hollow portion, and the connected portion is a second member side opening portion communicating with the second member side hollow portion And a contact area capable of coming into contact with the contact portion, and adjusting the connection position between the first member side connection portion and the second member side connection portion. Thus, the contact portion and the contact area contact with each other at a position where fluid tight contact is possible, and the first member side opening portion and the second member side opening portion communicate with each other and the first member side hollow portion The part and the second member side hollow part are in fluid tight communication.

  Moreover, it is preferable that the said to-be-contacted area | region is a taper surface.

  Moreover, it is preferable that the said 1st member is comprised from a base | substrate and an attachment provided with the said 1st member side main body and the said connection part.

  Moreover, it is preferable that the said contact part is a front-end | tip of the said connection part.

  Moreover, it is preferable that the site | part which contacts the said to-be-contacted area | region of the said contact part is a curved surface which has R.

  According to the connection structure of the present invention, in the connection structure between the first member and the second member which needs to be connected in a fluid tight manner, one kind of first member corresponds to different plural kinds of second members It is possible and highly versatile.

It is an exploded view of the connection structure of one embodiment of the present invention. It is a fragmentary sectional view showing the state before connection of the connection structure of one embodiment of the present invention. It is a fragmentary sectional view which shows the connection state of the connection structure of one Embodiment of this invention. (A) is a schematic view showing a state in which a second member having a connected portion with a large taper angle and a first member are connected, and (b) is a second example having a connected portion with a small taper angle It is the schematic which shows the state in which the member and the 1st member were connected. It is a fragmentary sectional view which shows the connection structure of other embodiment of this invention.

  Hereinafter, the connection structure of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 to 3, the connection structure C of the present embodiment includes the first member 1 having the first member side main body 11 and the connection portion 12, the second member side main body 21 and the connection portion 12. And a second member 2 having a connected portion 22 to be connected. The connection structure C fluidically connects the first member 1 and the second member 2 in a fluid-tight manner, and in the connection structure C, a flow path for causing fluid to flow from one of the first member 1 and the second member 2 to the other. Is the structure formed. The fluid flowing inside the connection structure C is, for example, a liquid (or a liquid mixed with a solid) such as a drug or a body fluid or a gas, but “fluid tight” is a concept including a liquid tight state and an air tight state. . However, in the present invention, depending on the application in which the present connection structure is used, the fluid may be either liquid or gas, and fluid tightness may be either liquid tight or gas tight. In the embodiment described below, a connection structure for connecting a medical device, specifically, a connection structure for connecting an attachment to which a syringe is connected and a catheter hub is described as an example, but the present invention The present invention is not limited to the following embodiments, and can be widely applied to a connection structure requiring a fluid-tight connection.

  The first member 1 has a lumen Ba (see FIG. 1) through which fluid flows, and when it is connected to the second member 2, the fluid flows between the first member 1 and the second member 2. As shown in FIG. 1 to FIG. 3, the first member 1 of the present embodiment is coaxially extended from the first member side main body 11 formed in a tubular shape and the first member side main body 11, and is a second member And a cylindrical connecting portion 12 connected to the two.

  In the present embodiment, as shown in FIGS. 1 to 3, the first member 1 includes a base 1 b such as a syringe and an attachment 1 a including the first member main body 11 and the connecting portion 12. In addition, although the base | substrate 1b is shown as a syringe by this embodiment, you may be another medical instrument which can be connected to the 1st member 1, such as an infusion bag and a tube. In the present embodiment, at one end side of the first member side main body 11, there is provided a base attachment portion 11a to which the base 1b is attached, such as a tip of a syringe. In the present embodiment, the tip of the syringe is inserted into the base attachment portion 11a, and the base 1b is attached to the base attachment portion 11a by known attachment means such as tapered connection. In the present embodiment, the first member 1 is shown in which the base 1b is configured to be attachable to and detachable from the attachment 1a. For example, as shown in FIG. Alternatively, the first member 1 in which the base and the attachment are integrated may be used.

  As shown in FIG. 1, when the boundary between the first member side main body 11 and the connection portion 12 is the first member side opening Op1 as shown in FIG. 1, the inner cavity Ba of the first member 1 has the first member side opening Op1 With a main body lumen Ba1 formed in the first member-side main body 11 and a connection portion lumen Ba2 formed in the connection portion 12. The main body cavity Ba1 and the connection portion lumen Ba2 communicate with each other through the first member side opening Op1, and the fluid can flow in the first member 1. In the present embodiment, as shown in FIGS. 2 and 3, after the base 1b such as a syringe is inserted into the main body lumen Ba1, the tip of the base 1b and the first member are mounted on the first member side main body 11. The first member-side hollow portion Ba11 is formed between the side opening Op1 and the side opening Op1. When the base 1b is not inserted into the main body lumen Ba1 such as when a tube is attached to the outside of the base attachment portion 11a, the main body lumen Ba1 becomes the first member-side hollow portion Ba11.

  As shown in FIGS. 1 to 3, in the first member 1, the first member side main body 11 is provided with the first member side connecting portion 13. The first member side connection portion 13 is a portion to which a second member side connection portion 23 provided on the second member 2 and described later is connected. The shape of the first member-side connecting portion 13 is not particularly limited, but in the present embodiment, the first member-side connecting portion 13 is formed of the first member 1 so as to surround a part on the proximal end 12 a side of the connecting portion 12. It extends in the axial direction, and a female screw 13 a is formed on the inner surface of the first member side connection portion 13. An external thread 23a formed on the outer periphery of the second member side connection portion 23 is screwed into the internal thread 13a, and the first member side connection portion 13 and the second member side connection portion 23 are connected. The connection between the first member-side connection portion 13 and the second member-side connection portion 23 is not particularly limited as long as it can be adjusted to the connection position as described later, and for example, as in the present embodiment After the elastic member is wound around the outer peripheral surface of the second member side connection portion 23, the elastic member is inserted into the first member side connection portion 13, and the first member side connection is made by the frictional force of the elastic member. The inner surface of the portion 13 and the outer surface of the second member side connection portion 23 may be connected so as to be adjustable at the connection position.

  The connecting portion 12 is a portion to be inserted into the connected portion 22 of the second member 2. The connection portion 12 is a hollow member in which the connection portion lumen Ba2 is formed. In the present embodiment, as shown in FIG. 1 to FIG. 3, the connection portion 12 is formed in a hollow conical shape (a frustoconical shape), and at the end portion on the base end portion 12 a side, the first member side hollow portion A first member side opening Op1 communicating with Ba11 (see FIGS. 2 and 3) is provided, and a tip end opening Op2 is formed at an end on the tip end 12b side. The connection portion 12 is not limited to the illustrated shape as long as the connection to the second member 2 is possible, and may be another shape such as a substantially cylindrical shape. Further, a space is formed between the outer periphery on the proximal end 12 a side of the connection portion 12 and the inner periphery of the first member side connection portion 13 so that the second member side connection portion 23 can be connected. There is.

  Similar to the first member 1, the second member 2 has a lumen Bb (see FIG. 1) through which fluid flows, and when connected to the first member 1, the second member 2 is connected to the first member 1. Distribute the fluid. The second member 2 is a catheter hub to which the catheter 3 is connected in the present embodiment, but is not particularly limited as long as it is a member that allows fluid to flow, and is another medical device such as a three-way stopcock or a Y-shaped connector. It does not matter.

  The second member 2 has a cylindrical second member side main body 21 and a connected portion 22 coaxially provided with the second member side main body 21 as shown in FIGS. 1 to 3. There is. Further, as shown in FIGS. 1 and 2, the second member 2 is provided with a second member side connecting portion 23 which is connected to the first member side connecting portion 13. In the present embodiment, the second member 2 has the second member side main body 21 on one end side (right side in FIGS. 1 to 3) of the second member 2 and the catheter 3 is connected to the second member side main body 21 It is done. Further, in the present embodiment, the connected portion 22 is coaxially continuously provided on the other end side (left side in FIGS. 1 to 3) of the second member side main body 21, and the other end side of the connected portion 22 The 2nd member side connection part 23 is provided in. The second member side connecting portion 23 is formed in a substantially cylindrical shape, and on the outer periphery of the second member side connecting portion 23, a male screw 23a is provided as described above. In the present embodiment, as shown in FIGS. 1 to 3, the outer surface of the connected portion 22 is expanded in diameter toward the end on the first member 1 side, and is formed in a substantially conical shape as a whole of the second member 2 It is done. Further, in the present embodiment, as shown in FIG. 1 and FIG. 2, the inner surface of the connected portion 22 is circular in cross section so that contact can be made with the contact portion 12 c whose outer peripheral cross section is circular. There is a tapered shape that increases in diameter toward the end on the first member 1 side. However, the outer and inner surfaces of the connected portion 22 are not particularly limited in shape as long as the first member 1 can be fluid-tightly connected. For example, the outer surface and the inner surface of the connected portion 22 do not need to be entirely tapered if the contacted region 22a with which the contact portion 12c described later contacts is formed, and a part of the axial direction is tapered It may be formed in a shape, or may be a step structure or the like in which the diameter is discontinuously stepwise reduced stepwise from the connected portion 22 toward the second member side main body 21. When both the connection portion 12 and the connection portion 22 are both formed in a tapered shape, the taper angle of the connection portion 12 (the angle with respect to the axial direction of the first member 1) can be connected to the first member 1 It forms so that it may become smaller than the taper angle (angle with respect to the axial direction of the 2nd member 2) of the to-be-connected part 22 of 2 members.

  When the boundary between the second member-side main body 21 and the connected portion 22 is the second member-side opening Op3, the inner cavity Bb of the second member 2 sandwiches the second member-side opening Op3 to form the second member A second member side hollow portion Bb1 formed in the side main body 21 and a connected portion side inner cavity Bb2 formed in the connected portion 22 (and the second member side connecting portion 23) are provided. The second member-side opening Op3 communicates with the second member-side hollow portion Bb1, and the second member-side hollow portion Bb1 and the connected portion-side inner bore Bb2 are configured to allow fluid to flow in the second member 2 ing. The second member 2 also has a main body side opening Op4 communicating with the lumen of the catheter 3 at one end side to which the catheter 3 is connected in FIGS. 1 to 3. In addition, the second member 2 has an insertion opening Op5 at the other end side to which the first member 1 is connected, in which the connection portion 12 of the first member 1 is inserted. In the present embodiment, the second member side hollow portion Bb1 is formed so as to have substantially the same cross section in the axial direction, and the connected portion side inner cavity Bb2 is a flow path as it goes to the second member side hollow portion Bb1. Is formed to be narrow. However, if the first member 1 and the second member 2 can be connected and fluid can be circulated, the second member-side hollow portion Bb1 and the connected portion-side lumen Bb2 have the shapes shown in the figure. It is not limited.

  Although the material of the first member 1 and the second member 2 is not particularly limited, for example, although it can be formed of resin or metal, for example, it is possible to use hard resin such as nylon, polypropylene, polyethylene, etc. Preferred from the viewpoint of toxicity.

  Next, connection of the first member 1 and the second member 2 will be described.

  As shown in FIGS. 2 and 3, the connection portion 12 of the first member 1 has a contact portion 12c in contact with the connected portion 22, and the connection portion 22 of the second member 2 and the contact portion 12c. It has a contactable contact area 22a.

  As shown in FIG. 2 and FIG. 3, the connection structure C of this embodiment adjusts the connecting position of the first member side connecting portion 13 and the second member side connecting portion 23 to obtain the contact portion 12 c and the contact portion 12 c. The contact area 22a is configured to be in contact in a fluid-tight contact position. The connection position between the first member side connecting portion 13 and the second member side connecting portion 23 is adjusted by changing the relative position of the first member 1 and the second member 2 in the axial direction. For example, in the present embodiment, the first member 1 or the second member is inserted after the second member side connecting portion 23 is inserted into the inside of the first member side connecting portion 13 and the female screw 13a and the male screw 23a are engaged. Adjustment can be made by rotating 2 around the axis and advancing and retracting the second member 2 with respect to the first member 1 in the axial direction. At this time, the connection between the first member-side connecting portion 13 and the second member-side connecting portion 23 is performed by inserting the connecting portion 12 and the shaft of the connected portion 22 when inserting the connecting portion 12 into the connected portion 22. Acting to center, the contact 12c of the connection 12 is guided to the appropriate contact position of the contact area 22a. By adjusting the connection position, the contact portion 12c contacts the to-be-contacted region 22a in the circumferential direction, and is pressed against the to-be-contacted region 22a to fit in the circumferential direction. And it is maintained by the 1st member side connection part 13 and the 2nd member side connection part 23 in the state which the contact part 12c and the to-be-contacted area | region 22a contacted. Thereby, as shown in FIG. 3, the first member side opening Op1 and the second member side opening Op3 communicate with each other, and the first member side hollow portion Ba11 and the second member side hollow portion Bb1 are fluid-tight. It communicates with Thus, in the present embodiment, a fluid communication path from the base 1b to the catheter 3 in a fluid-tight manner by the first member side hollow portion Ba11, the connection portion lumen Ba2, the connected portion lumen Bb2, and the second member side hollow portion Bb1. Is formed.

  The position of the contact portion 12c can be appropriately changed according to the shapes of the connection portion 12 and the connected portion 22. However, in the present embodiment, the contact portion 12c is shown as the tip portion 12b of the connection portion 12. It is done. By using the contact portion 12 c as the distal end portion 12 b of the connection portion 12, the distal end portion 12 b of the connection portion 12 can be firmly fixed to the to-be-contacted region 22 a. Moreover, the site | part which contacts the to-be-contacted area | region 22a of the contact part 12c is formed in the curved surface which has R in this embodiment. As a result, the contact portion 12c can be easily fitted at the time of contact with the contact area 22a, and absorption of tolerances can be facilitated. The shape of the to-be-contacted region 22a is not particularly limited as long as it can be contacted when the connecting portion 12 of the first member 1 is inserted into the connected portion 22. In the present embodiment, FIGS. As shown in FIG. 5, the contact area 22a is formed in a tapered surface. By forming the to-be-contacted region 22a as a tapered surface, the to-be-contacted region 22a is formed in a tapered shape even when a tolerance occurs when the first member 1 or the second member 2 is formed. The contact portion 12c reliably contacts the contact area 22 to facilitate the absorption of tolerances. The axial length of the connecting portion 12, the connected portion 22, the first member side connecting portion 13 and the second member side connecting portion 23 can be adjusted in connection position, and the contact portion 12c can be a contact area 22a. It is not particularly limited as long as it can contact

  In the connection structure C of the present embodiment, the outer surface of the connection portion 12 and the inner surface of the connected portion 22 are not tapered and the connection portion 12 (contact portion 12c) and the connected portion 22 (contacted region 22a) The connection 12 and the connection 22 do not come into contact during an axial relative movement between them. When adjustment of the connection position by the first member side connection portion 13 and the second member side connection portion 23 is performed, the contact portion 12c and the to-be-contacted region 22a are in contact with each other and maintained in contact with each other. Thereby, in the circumferential direction of the contact portion 12c, the contact portion 12c and the to-be-contacted region 22a are in contact and fluid-tightly connected. Thus, in the connection structure C of the present embodiment, the first member 1 and the second member 2 can be fluid-tightly connected without the tapered connection. Therefore, with one type of first member, it becomes possible to cope with a plurality of types of second members having different taper angles, and versatility is enhanced. This point will be described in more detail with reference to FIGS. 4 (a) and 4 (b).

  FIGS. 4A and 4B simplify the connection structure of FIGS. 1 to 3 and schematically show connection structures having different taper angles. The taper angle of the connected portion 22 shown in FIG. 4 (a) is larger than the taper angle of the connected portion 22 shown in FIG. 4 (b). For example, when the outer diameter and the inner diameter of the second member side connecting portion 23 of the second member 2 such as a catheter hub are fixed and the diameter of the second member side opening portion Op3 changes, FIGS. As shown in b), the taper angles of the connected parts 22 are different. For example, in the case of using a thin catheter 3 or the like, the diameters of the second member side opening Op3 and the second member side hollow portion Bb1 become smaller, and the taper angle becomes larger (see FIG. 4A). Conversely, when the diameter of the catheter 3 is increased, the diameters of the second member side opening Op3 and the second member side hollow portion Bb1 are increased, and the taper angle is decreased (see FIG. 4B). The schematic view of FIG. 4A and the schematic view of FIG. 4B are different only in the taper angle of the connected portion 22 of the second member 2 and the diameter of the second member side opening Op3. The first member 1 is identical in FIGS. 4A and 4B, and the diameter of the insertion opening Op5 of the second member 2 and the axial length from the insertion opening Op5 to the second member side opening Op3 The outer diameter of the second member side connecting portion 23 is the same. In FIG. 4B, the two-dot chain line indicates the taper angle and the position of the inner surface of the connected portion 22 (and the second member side connecting portion 23) in FIG. 4A. .

  As shown in FIG. 4A, when connecting the first member 1 to the second member 2 having the connected portion 22 with a large taper angle, the first member side connecting portion 13 and the second member side connecting portion 23 The contact portion 12c is brought into contact with the to-be-contacted region 22a by adjusting the connection position of the first member 1 and the second member 2 in a fluid-tight manner. At this time, in FIG. 4A, the end portion of the second member side connection portion 23 enters the inside of the first member side connection portion 13 from the end portion of the first member side connection portion 13 by a distance L1. . In addition, when the contact portion 12c of the connection portion 12 contacts the to-be-contacted region 22a of the connection portion 22, the second member side opening Op3 is separated from the contact portion 12c by the distance L2.

  On the other hand, when connecting the first member 1 to the second member 2 having the connected portion 22 with a small taper angle shown in FIG. 4B, the end of the second member side connection portion 23 is the first member side connection The distance L3 which enters the inside of the portion 13 is larger than the distance L1. Further, when the contact portion 12c of the connection portion 12 contacts the contact area 22a of the connected portion 22, the distance L4 from the second member side opening Op3 to the contact portion 12c is smaller than the distance L2 There is. As described above, even in the case where different second members 2 having different taper angles are connected to the first member 1, fluid tight connection can be achieved by adjusting the connection position. Therefore, according to the connection structure C of the present embodiment, for example, it becomes possible to connect to the plurality of types of second members 2 having different taper angles, and even if the type of the second members 2 changes, the first member 1 can be used. There is no need to change in accordance with the second member 2. Therefore, the first member 1 has high versatility, and there is no need to manufacture the plurality of types of first members 1 in accordance with the plurality of types of second members 2, and the manufacturing cost is reduced. And since it becomes possible to correspond to the 2nd member 2 which has a different taper angle by one kind of 1st member 1, according to the kind of 2nd member 2, out of a plurality of kinds of 1st members 1 The complexity of selecting one first member 1 is eliminated. That is, since the numerical value of the outer diameter of the contact portion 12c of the first member 1 is included in the range of the numerical value of the inner diameter at the second member side opening Op3 and the numerical value of the inner diameter at the insertion opening Op5, From the diameter range of the second member side opening Op3 and the diameter range of the insertion opening Op5 in the type of the second member 2, assuming that the to-be-contacted region 22a is a range assumed to be in contact with the contact portion 12c By forming the first member side connecting portion 13 and the second member side connecting portion 23 so that the contact portion 12c can be brought into fluid tight contact with the contact area 22a, the first member 1 and the second member 1 can be formed. A fluid-tight connection with the component 2 can be obtained.

  Further, in the connection structure C of the present embodiment, the connection between the first member side connection portion 13 and the second member side connection portion 23 is performed when the connection portion 12 is inserted into the connected portion 22. It functions to align the axes of 12 and connected portion 22. Therefore, the contact portion 12c of the connection portion 12 is guided to the accurate contact position of the contact area 22a, and fluid-tight contact between the first member 1 and the second member 2 is facilitated. Further, when the first member 1 and the second member 2 are in contact, a space is formed between the outer surface of the contact portion 12c and the inner surface of the connected portion 22, but the first member side connection is By connecting the portion 13 and the second member side connecting portion 23, the axial center of the connecting portion 12c is stabilized without being displaced with respect to the axial center of the connected portion 22. Therefore, the fluid-tight state is maintained when the first member 1 and the second member 2 are connected. Further, in the present embodiment, unlike the tapered connection, the connecting portion 12 is moved in the axial direction without contacting the inner surface of the connected portion 22 up to the point (contacted region 22a) where the contact portion 12c is finally located. Do. Therefore, resistance in the axial movement of the connection portion 12 is small, and attachment and detachment between the first member 1 and the second member 2 are facilitated.

  Moreover, in this embodiment, it is comprised from base 1b, such as a syringe, and the attachment 1a provided with the 1st member side main body 11 and the connection part 12. As shown in FIG. In this case, for example, when the base 1b such as a commercially available syringe is connected to the second member 2 such as a catheter hub, the commercially available base 1b and the second member 2 can be easily made only by preparing only the attachment 1a. It can be connected. Further, as shown in FIG. 5, when the distal end of the syringe is the connecting portion 12 and the first member 1 is one in which the base and the attachment are integrated, the distal end of the syringe is attached to a plurality of types of second members 2. This eliminates the need for preparing multiple types of syringes with different tip shapes.

DESCRIPTION OF SYMBOLS 1 1st member 1a attachment 1b base 11 first member side main body 11a base attachment part 12 connection part 12a proximal end of connection part 12b tip of connection part 12c contact part 13 first member side connection part 13a female screw 2 second Member 21 second member side main body 22 connected portion 22a contact area 23 second member side connection portion 23a male screw 3 catheter Ba lumen Ba1 main body cavity Ba11 first member side hollow portion Ba2 connection portion lumen Bb lumen Bb1 2 member side hollow part Bb2 Connected part side internal cavity C connection structure Op1 1st member side opening part Op2 tip end opening part Op3 2nd member side opening part Op4 Main body side opening part Op5 insertion opening part

Claims (5)

A first member having a first member side main body, and a connection portion coaxially extending from the first member side main body ;
A medical instrument comprising: a second member main body at one end side; and a second member coaxially provided at the other end side with the second member main body and connected to the connection portion. Connection structure to connect
The first member is provided with a first member side connecting portion having a screw portion in the first member side main body,
The first member side main body has a first member side hollow portion,
The connection portion is formed in a tubular shape having a base end portion and a tip end portion, and the connection portion is in contact with the first member side opening portion communicating with the first member side hollow portion, and the connection portion. And a contact portion provided at the tip end portion ,
The connection portion is integrally provided on the first member side main body,
The first member-side connecting portion extends coaxially with the connecting portion so as to surround a part of the proximal end side of the connecting portion.
Wherein the second member, the other end of the second member, the second member side connecting portion having a threaded portion for threaded portion screwed in the first member side connecting portion is provided,
The second member side main body has a second member side hollow portion,
The connected portion has a second member-side opening communicating with the second member-side hollow portion, and a contacted region capable of contacting the contact portion,
The first member is configured such that the axial centers of the connecting portion and the connected portion are aligned by screwing the first member side connecting portion and the second member side connecting portion.
The contact portion is formed by screwing the first member-side connection portion to the second member-side connection portion and adjusting the connection position of the first member-side connection portion and the second member-side connection portion. And the to-be-contacted region are in fluid-tight contact with each other at a position where the first member-side opening and the second member-side opening communicate with each other to form the first member-side hollow portion and the second In fluid tight communication with the member side hollow portion,
Connection structure.   The connection structure according to claim 1, wherein the contact area is a tapered surface.   The connection structure according to claim 1 or 2, wherein the first member comprises a base and an attachment including the first member side main body and the connection portion. The connection structure according to any one of claims 1 to 3 , wherein a portion of the contact portion in contact with the contact area is a curved surface having R. The connection structure according to any one of claims 1 to 4, wherein a catheter is connected to the second member side main body.

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