Medical connection components

Abstract

The present invention provides a medical connector that allows for more secure fixing of the connection between the first connector and the second connector using a cylindrical fixing device. [Solution] The medical connecting member 1 comprises a first connector portion 24, a second connector portion 34, and a cylindrical fixing device 4 for fixing the connection portion 5 between the first connector portion 24 and the second connector portion 34. The cylindrical fixing device 4 has a tapered portion 45 on its inner circumference, the inner diameter of which is larger than the outer diameter of the large diameter portion 35 of the second connector portion 34 and tapered toward one side, and a small diameter portion 46 formed on one side of the tapered portion 45 and capable of contacting the outer circumference of the large diameter portion 35. The tapered portion 45 has an inclination angle of less than 15 degrees with respect to the axial direction, and the inner diameter of the small diameter portion 46 is less than or equal to the outer diameter of the large diameter portion 35. The axial length of the small diameter portion 46 is shorter than the axial length of the tapered portion 45, and the ratio of the small diameter portion 46 to the axial length of the tapered portion 45 is 0.01 or more and 0.5 or less.

Description

Technical Field

[0001] The present invention relates to a medical connecting member.

Background Art

[0002] Conventionally, in a medical field, for example, a medical connecting member has been used to connect medical tubes applied to an extracorporeal blood circulation circuit, catheters, an infusion / blood set, and the like to each other.

[0003] The medical connecting member includes, for example, a first connector portion, a second connector portion, and a cylindrical fixture. The first connector portion has a male screw portion formed on an outer peripheral portion of a first end portion side which is one side in an axial direction. The second connector portion is provided on one side of a second end portion on the other side in the axial direction, and has a large diameter portion formed to project radially outward from the outer peripheral portion. The cylindrical fixture has, on its inner peripheral side, a female screw portion that engages with the male screw portion of the first connector portion, a tapered portion formed on one side in the axial direction from the female screw portion, the inner diameter of a portion on the other side in the axial direction being larger than the outer diameter of the outer peripheral portion of the large diameter portion and being reduced in diameter toward one side in the axial direction, and a small diameter portion formed on one side in the axial direction from the tapered portion and having an inner peripheral portion that can contact the outer peripheral portion of the large diameter portion of the second connector portion. Then, the cylindrical fixture tightens and fixes a connection portion where the first end portion of the first connector portion and the second end portion of the second connector portion are connected from the outside (for example, Patent Documents 1, 2, etc.).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In this type of medical connector, the frictional resistance caused by the contact between the outer circumference of the large-diameter portion of the second connector and the inner circumference of the small-diameter portion of the cylindrical fixing device maintains the state in which the cylindrical fixing device tightens the connection from the outside. However, there was still room for improvement in more firmly securing the connection between the first and second connector portions with the cylindrical fixing device.

[0006] Therefore, the present invention has been made in view of the above circumstances, and aims to provide a medical connecting member that can more firmly fix the connection between the first connector part and the second connector part with a cylindrical fixing device. [Means for solving the problem]

[0007] A medical connecting member according to one aspect of the present invention comprises: a first connector portion having a male threaded portion formed on the outer circumference of a first end on one side in the axial direction; a second connector portion provided on one side of the second end on the other side in the axial direction and having a large-diameter portion formed to protrude radially outward from the outer circumference; and a cylindrical fixing device that tightens and fixes the connecting portion, to which the first end of the first connector portion and the second end of the second connector portion are connected, from the outside. The cylindrical fixing device has on its inner circumference a female threaded portion that screws into the male threaded portion of the first connector portion; a tapered portion formed on one side in the axial direction from the female threaded portion, where the inner diameter of the portion on the other side in the axial direction is larger than the outer diameter of the outer circumference of the large-diameter portion, and the diameter is reduced toward one side in the axial direction; and a small-diameter portion formed on one side in the axial direction from the tapered portion and having an inner circumference that can contact the outer circumference of the large-diameter portion. The tapered portion has an inclination angle of less than 15 degrees with respect to the axial direction. The small diameter section has an inner diameter equal to or smaller than the outer diameter of the outer circumference of the large diameter section. The axial length of the small diameter section is shorter than the axial length of the tapered section, and the ratio of the small diameter section to the axial length of the tapered section (axial length of the small diameter section / axial length of the tapered section) is between 0.01 and 0.5.

[0008] Another aspect of the present invention relates to a medical connecting member comprising: a first connector portion having a male threaded portion formed on the outer circumference of a first end on one side in the axial direction; a second connector portion provided on one side of the second end on the other side in the axial direction and having a large-diameter portion formed to protrude radially outward from the outer circumference; and a cylindrical fixing device for tightening and fixing the connecting portion, to which the first end of the first connector portion and the second end of the second connector portion are connected, from the outside. The cylindrical fixing device has, on its inner circumference, a female threaded portion that screws into the male threaded portion of the first connector portion, and an engaging portion formed on one side in the axial direction from the female threaded portion and engaging with the outer circumference of the large-diameter portion of the second connector portion. The engaging portion has a tapered portion in which the inner diameter of the portion on the other side in the axial direction is larger than the outer diameter of the outer circumference of the large-diameter portion and is tapered toward one side in the axial direction, and a small-diameter portion formed continuously with the end on one side in the axial direction of the tapered portion and having an inner diameter equal along the axial direction. The tapered portion has an inclination angle of less than 15 degrees with respect to the axial direction. A clamping portion is provided in the section from a predetermined axial position of the first tapered portion to the other axial end of the small diameter portion, with an inner diameter less than or equal to the outer diameter of the outer circumference of the large diameter portion, and capable of contacting the outer circumference of the large diameter portion. The axial length from the clamping portion to one axial end of the small diameter portion is such that the ratio to the axial length of the tapered portion (axial length of the clamping portion / axial length of the tapered portion) is 0.03 or more and 0.3 or less. [Effects of the Invention]

[0009] According to the present invention, a medical connecting member can be provided that allows the connection between the first connector portion and the second connector portion to be more firmly fixed with a cylindrical fixing device. [Brief explanation of the drawing]

[0010] [Figure 1] This is a perspective view showing an example of the configuration of a medical connecting member in this embodiment. [Figure 2] This diagram shows the exploded view and assembled state of a medical connector. [Figure 3] This is a diagram showing the cross-section along line AA in Figure 1. [Figure 4] This is an enlarged view of the main part of Figure 3. [Figure 5]This is a cross-sectional view of the cylindrical fixing device along its axial direction. [Figure 6] This is an enlarged view of the vicinity of the second region in Figure 5. [Figure 7] This diagram shows the state in which the large-diameter portion of the second connector is in contact with the cylindrical fixing device. [Figure 8] This is a diagram illustrating the calculation of the loosening angle in the example. [Figure 9] This figure shows the results of the loosening angle measurement tests in the examples and comparative examples 1 and 2. [Modes for carrying out the invention]

[0011] The following describes an example of the configuration of a medical connecting member according to an embodiment, with reference to the drawings. The shapes and dimensions of each part in the drawings are schematic and do not represent the actual shapes and dimensions. In the drawings, the longitudinal direction of the medical connecting member is indicated as the axial direction Ax, and the length of each part along the axial direction Ax is defined as the axial length. The direction approximately perpendicular to the axial direction Ax is defined as the radial direction, and the rotational direction centered on the axial direction Ax is defined as the circumferential direction. One side of the axial direction Ax is indicated by the symbol S1, and the other side is indicated by the symbol S2.

[0012] Figure 1 is a perspective view showing an example of the configuration of the medical connecting member 1 in this embodiment. Figure 2 is a diagram showing the exploded view and assembled state of the medical connecting member 1. Figure 3 is a diagram showing the cross-section along line AA in Figure 1. Figure 4 is an enlarged view of the main part of Figure 3.

[0013] The medical connector member 1 of this embodiment comprises a female connector member 2 having a first connector portion 24, a male connector member 3 having a second connector portion, and a cylindrical fixing device 4.

[0014] The female connector member 2, the male connector member 3, and the cylindrical fixture 4 are injection molded products formed of a resin material such as polycarbonate, polyethylene, polypropylene, polystyrene, ABS, methacrylic resin, acrylic resin, etc. The materials of the female connector member 2, the male connector member 3, and the cylindrical fixture 4 may all be the same or different from each other.

[0015] The female connector member 2 is a bifurcated branch tubular member. The female connector member 2 has a first tube receiving portion 21 at the end of the other side S2 of the member for receiving a medical tube (not shown). In the female connector member 2, the pipeline 23 from the first tube receiving portion 21 on the other side S2 branches into two midway. In the female connector member 2, the two ends of the pipeline 23 on the side opposite to the end on the other side S2 are also each referred to as a first end 22.

[0016] One of the first ends 22 in the female connector member 2 is formed in the main pipeline 23a that extends linearly from the first tube receiving portion 21. The other first end 22 in the female connector member 2 is formed in a branch pipeline 23b that branches from the main pipeline 23a and extends obliquely with respect to the main pipeline 23a.

[0017] Also, in the main pipeline 23a and the branch pipeline 23b of the female connector member 2, first connector portions 24 that can be connected to the second connector portion 34 of the male connector member 3 are respectively formed. The configurations of the first connector portion 24 formed in the main pipeline 23a and the first connector portion 24 formed in the branch pipeline 23b are both common. In the following description, for simplicity, the configuration of the first connector portion 24 formed in the main pipeline 23a will be mainly described, and any duplicate descriptions regarding the first connector portion 24 formed in the branch pipeline 23b will be appropriately omitted as needed.

[0018] The first connector portion 24 is formed on one side S1 in the axial direction Ax in the main pipeline 23a of the female connector member 2. The first connector portion 24 has a cylindrical first end 22 formed on one side S1 in the axial direction Ax of the main pipeline 23a and communicating with the main pipeline 23a, and a male screw portion 25.

[0019] The inner diameter of the first end portion 22 is larger than the inner diameter of the main conduit 23a. The second end portion 32 of the second connector portion 34, which will be described later, is inserted into the first end portion 22. The male threaded portion 25 is formed on the outer circumference of the first end portion 22 and screws into the female threaded portion 43 of the cylindrical fixing device 4, which will be described later.

[0020] The male connector member 3 is a cylindrical member that connects to the female connector member 2. Figures 1 to 3 show an example where the male connector member 3 is connected to the main conduit 23a of the female connector member 2, but the male connector member 3 may also be connected to the branch conduit 23b of the female connector member 2.

[0021] As shown in Figure 3, a conduit 33 is formed inside the male connector member 3, penetrating the member in the axial direction Ax. A second tube receiving portion 31 for receiving a medical tube (not shown) is provided at one end S1 in the axial direction Ax of the male connector member 3.

[0022] Furthermore, a second connector portion 34 is formed on the other side S2 of the male connector member 3 in the axial direction Ax. The second connector portion 34 has a second end portion 32 and a large-diameter portion 35.

[0023] The second end portion 32 is a cylindrical portion of the male connector member 3 that protrudes to the other side S2 in the axial direction Ax. The outer circumference of the second end portion 32 is formed in a tapered shape that widens from the other side S2 in the axial direction Ax towards the one side S1. Furthermore, the outer diameter of the tip portion of the second end portion 32 located on the other side S2 is formed to be smaller than the inner diameter of the first end portion 22 of the first connector portion 24, and the outer diameter of the one side S1 of the second end portion 32 is formed to be greater than or equal to the inner diameter of the first end portion 22. As a result, the second end portion 32 of the second connector portion 34 and the first end portion 22 of the first connector portion 24 can be connected by inserting the tapered second end portion 32 of the second connector portion 34 into the first end portion 22 of the first connector portion 24.

[0024] The large-diameter portion 35 is located on the second connector portion 34 at a position S1 to one side of the second end portion 32. The large-diameter portion 35 protrudes radially outward from the outer circumference of the second end portion 32 and is formed to form an annular shape in the circumferential direction. On the other side S2 of the large-diameter portion 35, a tapered notch portion 35a is formed that gradually decreases in diameter towards the other side S2. Furthermore, the outer diameter of the outer circumference 35b of the large-diameter portion 35 is formed to be equal along the axial direction Ax, except for the portion of the notch portion 35a on the other side S2.

[0025] The cylindrical fixing device 4 is an annular member attached to the outer circumference of the first connector portion 24 of the female connector member 2 and the second connector portion 34 of the male connector member 3. The cylindrical fixing device 4 functions to tighten and secure the connection portion 5, which is connected by inserting the second end portion 32 of the second connector portion 34 into the first end portion 22 of the first connector portion 24, from the outside. In Figures 1 to 3, an example is shown in which the cylindrical fixing device 4 is attached to the main conduit 23a side of the female connector member 2, but the cylindrical fixing device 4 may also be attached to the branch conduit 23b side of the female connector member 2. Furthermore, the state of the connection portion 5 in Figure 4 is just an example, and in the connection portion 5, for example, the second connector portion 25 may be inserted into the first connector portion 24 such that it is located on the other side S2 than in the state shown in Figure 4.

[0026] The cylindrical fixing device 4 has a first portion 41 on the other side S2 in the axial direction Ax that can accommodate the first end portion 22 of the first connector portion 24. The cylindrical fixing device 4 also has a second portion 42 on one side S1 in the axial direction Ax from the first portion 41 that can accommodate the large diameter portion 35 of the second connector portion 34 and engage with the outer circumference 35b of the large diameter portion 35 of the second connector portion 34. Note that the second portion 42 is an example of an engaging portion.

[0027] Figure 5 is a cross-sectional view of the cylindrical fixing device 4 along the axial direction Ax. Figure 6(a) is an enlarged view of the vicinity of the second portion 42, which is enclosed by a dashed line in Figure 5. Figure 6(b) is an enlarged view of the first tapered portion 45a and the second tapered portion 45b in Figure 6(a). Figure 7 shows the state in which the large diameter portion 35 of the second connector portion 34 is in contact with the cylindrical fixing device 4. In Figure 6(b), the first inclination angle θ1 and the second inclination angle θ2 are shown with respect to auxiliary lines parallel to the axial direction Ax.

[0028] The inner diameter of the first portion 41 of the cylindrical fixing device 4 is larger than the outer diameter of the first end portion 22 of the first connector portion 24, and is sized to accommodate the first end portion 22. A female threaded portion 43 is formed on the inner circumference side of the first portion 41, which screws into the male threaded portion 25 of the first connector portion 24.

[0029] The second portion 42 of the cylindrical fixing device 4 has an enlarged diameter portion 44, a tapered portion 45, a small diameter portion 46, and a stepped portion 47 on its inner circumference. In the drawing, the positions of the enlarged diameter portion 44, the tapered portion 45 (first tapered portion 45a, second tapered portion 45b), and the small diameter portion 46 are indicated using leader lines as appropriate.

[0030] The tapered portion 45 is formed on the inner circumference side of the cylindrical fixing device 4, on one side S1 in the axial direction Ax from the first portion 41 having the female thread portion 43. The tapered portion 45 has an inner tapered space that decreases in diameter from the other side S2 in the axial direction Ax toward the one side S1, with the central axis C of the cylindrical fixing device 4 as the center.

[0031] One side S1 of the tapered portion 45 is continuous with the other end S2 of the small diameter portion 46 in the axial direction Ax. Furthermore, the inner diameter of the other side S2 of the tapered portion 45 in the axial direction Ax is larger than the outer diameter of the outer circumference 35b of the large diameter portion 35 of the second connector portion 34. As a result, by moving the cylindrical fixing device 4 relative to the second connector portion 34 to the other side S2, the large diameter portion 35 of the second connector portion 34 can be inserted into the tapered portion 45 from the other side S2.

[0032] Here, on the other side S2 in the axial direction Ax of the tapered portion 45, an enlarged diameter portion 44 is formed, which is wider in diameter toward the other side S2 in the axial direction Ax than the end of the other side S2 of the tapered portion 45. The boundary portion between the enlarged diameter portion 44 and the tapered portion 45 is formed as a curved surface that is convex toward the axial side. By forming an enlarged diameter portion 44 on the other side S2 of the tapered portion 45, the large diameter portion 35 of the second connector portion 34 is more easily inserted into the tapered portion 45 from the other side S2 when the cylindrical fixing device 4 is screwed to the first connector portion 24. This improves the workability when connecting the medical connecting member 1.

[0033] The tapered portion 45 includes a first tapered portion 45a and a second tapered portion 45b, each having different inclination angles θ1 and θ2 with respect to the axial direction Ax. The first tapered portion 45a is formed on one side S1 of the tapered portion 45 in the axial direction Ax, and the end of that one side S1 is continuous with the end of the other side S2 of the small diameter portion 46 in the axial direction Ax.

[0034] Furthermore, the tapered portion 45 is formed such that the inclination angle θ with respect to the axial Ax is less than 15 degrees across the entire tapered portion 45 in the axial direction Ax (from one side S1 of the first tapered portion 45a to the other side S2 of the second tapered portion 45b). In other words, in the tapered portion 45, the first inclination angle θ1 with respect to the axial Ax at the first tapered portion 45a on one side S1 and the second inclination angle θ2 with respect to the axial Ax at the second tapered portion 45b on the other side S2 are both less than 15 degrees.

[0035] Furthermore, the boundary between the first tapered portion 45a and the small-diameter portion 46 is formed in a curved shape that is convex toward the axial side. By forming the boundary between the first tapered portion 45a and the small-diameter portion 46 in a curved shape, it becomes easier to smoothly insert the large-diameter portion 35 into the small-diameter portion 46.

[0036] Here, as will be described later, if the inner diameter of the inner circumference 46b of the small diameter portion 46 is smaller than the outer diameter of the outer circumference 35b of the large diameter portion 35, then in the tapered portion 45, a portion is partially formed on one side S1 of the first tapered portion 45a that is continuous with the other end S2 of the small diameter portion 46, where the inner diameter is less than or equal to the outer diameter of the outer circumference 35b of the large diameter portion 35 of the second connector portion 34 (i.e., a portion where the tightening allowance with the large diameter portion 35 is greater than 0). As a result, when the large diameter portion 35 of the second connector portion 34 is inserted into the first tapered portion 45a, the portion on one side S1 of the first tapered portion 45a can come into contact with the end on one side S1 of the outer circumference 35b of the large diameter portion 35 (see Figure 7(a)). Furthermore, the portion on one side S1 of the first tapered portion 45a where the inner diameter is less than or equal to the outer diameter of the outer circumference 35b of the large diameter portion 35 is an example of a clamping portion 40 formed on the tapered portion 45.

[0037] While not particularly limited, it is preferable that the axial length from the clamping portion 40 to the end of one side S1 in the axial direction Ax of the small diameter portion 46 be formed such that the ratio to the axial length of the tapered portion 45 (axial length of clamping portion 40 / axial length of tapered portion 45) is 0.03 or more and 0.3 or less. By setting the axial length of the clamping portion 40 / axial length of the tapered portion 45 to 0.03 or more, a practically sufficient range of the tapered portion 45 that can function as the clamping portion 40 in the axial direction Ax can be secured. Furthermore, by setting the axial length of the clamping portion 40 / axial length of the tapered portion 45 to 0.3 or less, it is possible to suppress the problem of the second connector portion 34 becoming difficult to insert into the tapered portion 45 and the small diameter portion 46 due to the lengthening of the clamping portion 40.

[0038] As an example, consider the case where the inner diameter of the first tapered portion 45a is 6.0 mm ± 0.1 mm at the center in the axial direction Ax, the inner diameter of one side S1 of the first tapered portion 45a (boundary with the small diameter portion 46) is 5.9 mm, the inner diameter of the other side S2 of the first tapered portion 45a (boundary with the second tapered portion 45b) is 6.1 mm, the axial length from the clamping portion 40 to the small diameter portion 46 is 0.42 mm, and the axial length of the tapered portion 45 is 2.95 mm. Under the above conditions, the axial length of the clamping portion 40 / the axial length of the tapered portion 45 is 0.14 (0.42 / 2.95). If the position of the clamping portion 40 is the same as the boundary with the small diameter portion 46, the axial length of the clamping portion 40 / the axial length of the tapered portion 45 is 0.034 (0.1 / 2.95). If the position of the clamping portion 40 is the same as the boundary with the second tapered portion 45b, the axial length of the clamping portion 40 / the axial length of the tapered portion 45 is 0.2 (0.6 / 2.95). In practice, the inner diameter at the boundary with the second tapered portion 45b is determined by defining the shape of the second tapered portion 45b using the diameter and length dimensions of one side S1 and the other side S2, and then defining the length dimensions of the small diameter portion 46 and the first tapered portion 45a. Therefore, the inner diameter at the boundary with the second tapered portion 45b can be increased or decreased according to the above parameters.

[0039] The second tapered portion 45b is formed on the other side S2 in the axial direction Ax than the first tapered portion 45a, and the end of its one side S1 is continuous with the end of the first tapered portion 45a on the other side S2 in the axial direction Ax.

[0040] In the tapered portion 45, the axial length of the first tapered portion 45a is shorter than the axial length of the second tapered portion 45b. Also, the first inclination angle θ1 with respect to the axial direction Ax in the first tapered portion 45a is less than 15 degrees. The first inclination angle θ1 is preferably, for example, 3 degrees or more and less than 15 degrees, and more preferably 4 degrees or more and 10 degrees or less.

[0041] By setting the inclination angle θ of the tapered portion 45 (or the first inclination angle θ1 of the first tapered portion 45a) to less than 15 degrees, the inclination angle of the tapered portion 45 adjacent to the small diameter portion 46 becomes gentler with respect to the axial Ax, compared to conventional configurations such as those described in Patent Documents 1 and 2. In other words, in this embodiment, the degree to which the space of the tapered portion 45 expands from one side S1 to the other side S2 in the axial Ax is smaller than in conventional configurations. For example, if the large diameter portion 35 is tightened by the tapered portion 45, the tightening at the tapered portion 45 is ensured even if the large diameter portion 35 shifts slightly to the other side S2, so the cylindrical fixing device 4 is less likely to loosen than in conventional configurations.

[0042] On the other hand, the second inclination angle θ2 with respect to the axial Ax in the second tapered portion 45b is smaller than the first inclination angle θ1 of the first tapered portion 45a, for example, less than 3 degrees. Although not particularly limited, it is more preferable that the second inclination angle θ2 is less than 2 degrees.

[0043] By providing a gently sloping second tapered portion 45b on the other side S2 of the first tapered portion 45a, the radial gap between the large-diameter portion 35 and the inner circumference of the tapered portion 45 when inserting the second connector portion 34 into the tapered portion 45 can be reduced compared to the case where the entire tapered portion 45 has a first inclination angle θ1. This makes it less likely that the second connector portion 34 will be inserted into the cylindrical fixing device 4 at an angle.

[0044] As described above, the small-diameter portion 46 is formed on one side S1 in the axial direction Ax compared to the tapered portion 45. The small-diameter portion 46 has a cylindrical space inside with a small axial length centered on the central axis C of the cylindrical fixing device 4. Furthermore, the inner diameter of the inner circumference 46b of the small diameter portion 46 is equal along the axial Ax from one end S1 to the other end S2. By making the inner diameter of the inner circumference 46b of the small diameter portion 46 equal along the axial Ax, the contact area between the inner circumference 46b of the small diameter portion 46 and the large diameter portion 35 of the second connector portion 34 is increased. This makes it possible to further increase the frictional resistance against circumferential movement in the direction in which the cylindrical fixing device 4 loosens.

[0045] The inner diameter of the inner circumference 46b of the small diameter portion 46 is equal to the outer diameter of the outer circumference 35b of the large diameter portion 35 of the second connector portion 34, or slightly smaller than the outer diameter of the outer circumference 35b. For example, the inner diameter of the inner circumference 46b of the small diameter portion 46 is preferably greater than 95 and less than 100, and more preferably between 96 and 98, when the outer diameter of the outer circumference 35b of the large diameter portion 35 is set to 100.

[0046] As described above, by making the inner diameter of the inner circumference 46b of the small diameter portion 46 equal to the outer diameter of the outer circumference 35b of the large diameter portion 35, or slightly smaller than the outer diameter of the outer circumference 35b of the large diameter portion 35, it becomes possible to insert the large diameter portion 35 of the second connector portion 34 into the small diameter portion 46 of the cylindrical fixing device 4. Furthermore, since the tightening clearance value between the small diameter portion 46 of the cylindrical fixing device 4 and the large diameter portion 35 is 0 or greater, when the large diameter portion 35 of the second connector portion 34 is inserted into the small diameter portion 46 of the cylindrical fixing device 4, the inner circumference 46b of the small diameter portion 46 comes into contact with the outer circumference 35b of the large diameter portion 35 (see Figure 7(b)).

[0047] Furthermore, by making the inner diameter of the inner circumference 46b of the small diameter portion 46 greater than 95 and less than 100 when the outer diameter of the outer circumference 35b of the large diameter portion 35 is set to 100, it becomes possible to easily insert the large diameter portion 35 into the small diameter portion 46 without impairing the tightening function of the small diameter portion 46 for the large diameter portion 35.

[0048] As an example, consider the case where the inner diameter of the inner circumference 46b of the small diameter section 46 is 6.0 mm and the tolerance of the inner diameter is +0 / -0.1 mm, and the outer diameter of the outer circumference 35b of the large diameter section 35 is 6.0 mm and the tolerance of the outer diameter is +0.05 / -0 mm. Under the above conditions, when the inner diameter of the inner circumference 46b of the small diameter portion 46 is 6.0 mm and the outer diameter of the outer circumference 35b of the large diameter portion 35 is 6.00 mm, the inner diameter of the inner circumference 46b of the small diameter portion 46 is 100 when the outer diameter of the outer circumference 35b of the large diameter portion 35 is set to 100. On the other hand, under the above conditions, when the inner diameter of the inner circumference 46b of the small diameter portion 46 is 5.9 mm and the outer diameter of the outer circumference 35b of the large diameter portion 35 is 6.05 mm, the inner diameter of the inner circumference 46b of the small diameter portion 46 is the minimum value of 97.5 when the outer diameter of the outer circumference 35b of the large diameter portion 35 is set to 100.

[0049] The axial length of the small-diameter portion 46 is formed to be extremely short and minute compared to the axial length of the tapered portion 45. For example, the ratio of the axial length of the small-diameter portion 46 to the axial length of the tapered portion 45 (axial length of the small-diameter portion 46 / axial length of the tapered portion 45) is 0.01 or more and 0.5 or less, with 0.03 or more and 0.2 or less being more preferable. By setting the axial length of the small-diameter portion 46 / axial length of the tapered portion 45 to 0.01 or more, a sufficient contact area between the small-diameter portion 46 and the large-diameter portion 35 can be secured to generate sufficient frictional resistance for practical use. Furthermore, by setting the axial length of the small-diameter portion 46 / axial length of the tapered portion 45 to 0.5 or less, the axial length of the small-diameter portion 46 can be made significantly shorter compared to conventional configurations. This makes it easy to insert the large-diameter portion 35 into the small-diameter portion 46 and tighten the large-diameter portion 35 with the small-diameter portion 46 to prevent loosening. Furthermore, by setting the axial length of the small-diameter section 46 / axial length of the tapered section 45 to 0.01 or more and 0.5 or less, the overall axial length of the tapered section 45 becomes relatively longer compared to the conventional configuration. As a result, even if the length of the tapered section 45 is the same as in the conventional configuration, the inclination angle of the tapered section 45 with respect to the axial direction Ax can be made gentler.

[0050] Furthermore, the axial length of the small-diameter portion 46 is shorter than the axial length of the first tapered portion 45a adjacent to the small-diameter portion 46 within the tapered portion 45. For example, the ratio of the axial length of the small-diameter portion 46 to the axial length of the first tapered portion 45a (axial length of the small-diameter portion 46 / axial length of the first tapered portion 45a) is 0.05 or more and 0.3 or less, with 0.1 or more and 0.2 or less being more preferable. By setting the axial length of the small diameter portion 46 / the axial length of the first tapered portion 45a to 0.05 or more, a sufficient contact area between the small diameter portion 46 and the large diameter portion 35 can be secured to generate sufficient frictional resistance for practical use. Furthermore, by setting the axial length of the small diameter portion 46 / the axial length of the first tapered portion 45a to 0.3 or less, the axial length of the small diameter portion 46 can be made significantly shorter compared to conventional configurations. This makes it easy to insert the large diameter portion 35 into the small diameter portion 46 and to tighten the large diameter portion 35 with the small diameter portion 46 to prevent loosening.

[0051] As an example, consider the case where the axial length of the small diameter section 46 is 0.1 mm, the tolerance of the axial length of the small diameter section 46 is ±0.05 mm, the axial length of the first tapered section 45a is 0.6 mm, the axial length of the second tapered section 45b is 2.35 mm, and the tolerance of the axial lengths of the first tapered section 45a and the second tapered section 45b is ±0.1 mm. Under the above conditions, the axial length of the small diameter section 46 / the axial length of the tapered section 45 is dimensionally 0.034 (0.1 / 2.95). Considering the above tolerance, the axial length of the small diameter section 46 / the axial length of the tapered section 45 will be in the range of 0.016 (0.05 / 3.15) to 0.055 (0.15 / 2.75). Furthermore, under the above conditions, the axial length of the small diameter portion 46 / the axial length of the first tapered portion 45a is dimensionally 0.167 (0.1 / 0.6). Considering the above tolerances, the axial length of the small diameter portion 46 / the axial length of the first tapered portion 45a will be in the range of 0.077 (0.05 / 0.65) to 0.27 (0.15 / 0.55).

[0052] Furthermore, the axial length of the small diameter portion 46 is a minute dimension compared to the inner diameter of the inner circumference portion 46b of the small diameter portion 46. For example, the ratio of the axial length of the small diameter portion 46 to the inner diameter of the inner circumference portion 46b (axial length of the small diameter portion 46 / inner diameter of the inner circumference portion 46b of the small diameter portion 46) is 0.03 or less. By setting the axial length of the small-diameter portion 46 and the inner diameter of the inner circumference portion 46b of the small-diameter portion 46 to 0.03 or less, it is possible to ensure a sufficient contact area between the small-diameter portion 46 and the large-diameter portion 35 to generate sufficient frictional resistance for practical purposes, while significantly shortening the axial length of the small-diameter portion 46 compared to conventional configurations. This facilitates the insertion of the large-diameter portion 35 into the small-diameter portion 46 and allows the small-diameter portion 46 to tighten and hold the large-diameter portion 35.

[0053] As an example, consider the case where the axial length of the small diameter portion 46 is 0.1 mm, the tolerance of the axial length of the small diameter portion 46 is ±0.05 mm, the inner diameter dimension of the inner circumference portion 46b of the small diameter portion 46 is 6.0 mm, and the tolerance of the inner diameter dimension is +0 / -0.1 mm. Under the above conditions, the axial length of the small diameter portion 46 and the inner diameter of the inner circumference portion 46b of the small diameter portion 46 are dimensionally 0.0166 (0.1 / 6.0). Considering the above tolerance, the axial length of the small diameter portion 46 and the inner diameter of the inner circumference portion 46b of the small diameter portion 46 will be in the range of 0.0083 (0.05 / 6.0) to 0.0025 (0.15 / 5.9).

[0054] The stepped portion 47 is formed on one side S1 of the small diameter portion 46, projecting radially inward to form an annular shape in the circumferential direction. On the other side S2 of the stepped portion 47, the stepped surface 47a formed by the end of one side S1 of the small diameter portion 46 and the stepped portion 47 abuts against the end of one side S1 of the large diameter portion 35 of the second connector portion 34, and functions as a stopper to prevent the second connector portion 34 from coming off one side S1.

[0055] Furthermore, a tapered notch 48 is formed on the inner circumference of one end S1 of the cylindrical fixing device 4. The notch 48 gradually decreases in diameter towards the other end S2, and the other end S2 of the notch 48 is connected to the end S1 of the stepped portion 47. The notch 48 of the cylindrical fixing device 4 receives the notch 35a formed at the other end S2 of the large diameter portion 35, and serves to facilitate the insertion of the second connector portion 34 into the cylindrical fixing device 4 from one end S1.

[0056] The assembly of the medical connecting member 1 in this embodiment is performed as follows. In the following example, it is assumed that the inner diameter of the inner circumference 46b of the small diameter portion 46 is less than the outer diameter of the outer circumference 35b of the large diameter portion 35.

[0057] First, the second connector portion 34 of the male connector member 3 is inserted into the cylindrical fixing device 4 from one side S1 in the axial direction Ax, and the second connector portion 34 is fitted into the cylindrical fixing device 4 so that the large diameter portion 35 of the second connector portion 34 is located on the other side S2 of the cylindrical fixing device 4. As a result, the cylindrical fixing device 4 is positioned on one side S1 relative to the large diameter portion 35. Next, the second end 32 of the other side S2 of the second connector portion 34 is inserted into the first end 22 of the first connector portion 24 of the female connector member 2, thereby connecting the first connector portion 24 and the second connector portion 34 in the axial direction Ax.

[0058] Subsequently, the cylindrical fixing device 4, which is located on one side S1 of the large-diameter portion 35 of the second connector portion 34, is moved to the other side S2, and the male threaded portion 25 of the first connector portion 24 and the female threaded portion 43 of the cylindrical fixing device 4 are screwed together. When the male threaded portion 25 and the female threaded portion 43 are screwed together, the male threaded portion 25 of the first connector portion 24 overlaps with the first portion 41 of the cylindrical fixing device 4 in the radial direction, and the connection portion 5, where the first end portion 22 of the first connector portion 24 and the second end portion 32 of the second connector portion 34 are connected, is covered from the outside by the cylindrical fixing device 4.

[0059] As described above, when the cylindrical fixing device 4 is moved to the other side S2, the large-diameter portion 35 of the second connector portion 34 moves inside the cylindrical fixing device 4 from the other side S2 towards the one side S1. As a result, the large-diameter portion 35 of the second connector portion 34 passes through the first portion 41 and the enlarged diameter portion 44 and is inserted into the tapered portion 45 from the other side S2.

[0060] Then, with the first connector section 24 and the second connector section 34 connected, when the first connector section 24 and the cylindrical fixing device 4 are screwed together, the screwed cylindrical fixing device 4 moves toward the other side S2 so as to approach the first connector section 24.

[0061] On the other hand, the second connector portion 34 is connected to the first connector portion 24 and held by the first connector portion 24. When the cylindrical fixing device 4 is screwed to the first connector portion 24, the cylindrical fixing device 4 and the large-diameter portion 35 of the second connector portion 34 come into contact, as described later, and a load is applied to the second connector portion 34 from the cylindrical fixing device 4 to the other side S2, thereby firmly fixing the connection portion 5.

[0062] When the cylindrical fastener 4 is screwed to the first connector portion 24, the large-diameter portion 35 of the second connector portion 34 advances relatively towards one side S1 within the tapered portion 45 of the cylindrical fastener 4. When the large-diameter portion 35 advances toward one side S1 to a point where the inner diameter of the first tapered portion 45a is smaller than the outer diameter of the outer circumference portion 35b of the large-diameter portion 35, the edge portion of the outer circumference portion 35b of the large-diameter portion 35 (on one side S1) comes into contact with the inner circumference portion of the first tapered portion 45a, as shown in Figure 7(a).

[0063] In the state shown in Figure 7(a), the edge portion of the outer circumference 35b makes line contact with the inner circumference of the first tapered portion 45a in a circumferentially annular manner and is tightened from the outside. In the state shown in Figure 7(a), frictional resistance is generated against circumferential movement in the direction that would loosen the cylindrical fastener 4 due to the contact between the edge portion of the outer circumference 35b and the inner circumference of the first tapered portion 45a. This suppresses loosening of the cylindrical fastener 4, which is screwed to the first connector portion 24.

[0064] As the large-diameter portion 35 moves further toward one side S1 from the state shown in Figure 7(a), one side S1 of the outer circumference 35b of the large-diameter portion 35 is inserted into the small-diameter portion 46 of the cylindrical fixing device 4, as shown in Figure 7(b).

[0065] In the state shown in Figure 7(b), one side S1 of the outer circumference 35b of the large diameter portion 35 is in surface contact with the inner circumference 46b of the small diameter portion 46 in a circumferentially annular manner and is tightened from the outside. In the state shown in Figure 7(b), frictional resistance is generated against circumferential movement in the direction that would loosen the cylindrical fastener 4 due to the contact between the outer circumference 35b and the inner circumference 46b of the small diameter portion 46. This suppresses the loosening of the cylindrical fastener 4, which is screwed to the first connector portion 24. Comparing the states shown in Figures 7(a) and (b), the contact area of ​​the outer circumference 35b of the large diameter portion 35 with respect to the cylindrical fastener 4 is larger in the state shown in Figure 7(b), where the large diameter portion 35 is in contact with the small diameter portion 46, and the frictional resistance is greater as a result.

[0066] The operation of the medical connecting member 1 of this embodiment will be described below. The medical connecting member 1 of this embodiment comprises a first connector portion 24 (female connector member 2) having a male screw portion 25 formed on the outer circumference of the first end portion 22 which is on one side S1 in the axial direction Ax; a second connector portion 34 (male connector member 3) provided on one side S1 of the second end portion 32 on the other side S2 in the axial direction Ax and having a large diameter portion 35 formed to protrude radially outward from the outer circumference; and a cylindrical fixing device 4 that tightens and fixes the connecting portion 5, to which the first end portion 22 of the first connector portion 24 and the second end portion 32 of the second connector portion 34 are connected, from the outside. The cylindrical fixing device 4 has, on its inner circumference, a female threaded portion 43 that screws into the male threaded portion 25 of the first connector portion 24, a tapered portion 45 formed on one side S1 in the axial direction Ax from the female threaded portion 43, the inner diameter of the portion on the other side S2 in the axial direction Ax being larger than the outer diameter of the outer circumference 35b of the large diameter portion 35 and tapering toward one side S1 in the axial direction Ax, and a small diameter portion 46 formed on one side S1 in the axial direction Ax from the tapered portion 45 and having an inner circumference 46b that can abut against the outer circumference 35b of the large diameter portion 35. The tapered portion 45 has an inclination angle θ with respect to the axial direction Ax of less than 15 degrees. The small diameter portion 46 has an inner circumference 46b whose inner diameter is equal to or smaller than the outer diameter of the outer circumference 35b of the large diameter portion 35. The axial length of the small-diameter portion 46 is shorter than the axial length of the tapered portion 45, and the ratio of the small-diameter portion 46 to the axial length of the tapered portion 45 (axial length of the small-diameter portion 46 / axial length of the tapered portion 45) is between 0.01 and 0.5. With the above configuration, the connection portion 5, to which the first end portion 22 of the first connector portion 24 and the second end portion 32 of the second connector portion 34 are connected, can be firmly fixed by screwing the cylindrical fixing device 4. In addition, the outer circumference 35b of the large diameter portion 35 comes into contact with the inner circumference 46b of the small diameter portion 46 or the inner circumference of the tapered portion 45, creating frictional resistance against circumferential movement in the direction that would loosen the cylindrical fixing device 4, thereby suppressing loosening of the cylindrical fixing device 4. Furthermore, in the above configuration, the ratio of the tapered portion 45 to the axial length is set to 0.01 or more and 0.5 or less, making the axial length of the small-diameter portion 46 very short relative to the axial length of the tapered portion 45. As a result, compared to the conventional case where the axial length of the small-diameter portion 46 is long, the large-diameter portion 35 of the second connector portion 34 is more easily inserted into the inner circumference portion 46b of the small-diameter portion 46, and a state in which the outer circumference portion 35b of the large-diameter portion 35 makes surface contact with the inner circumference portion 46b of the small-diameter portion 46 and is tightened is formed more easily than in the conventional case. Furthermore, in the above configuration, the axial length of the tapered portion 45 is increased compared to the conventional configuration, and the inclination angle θ of the tapered portion 45 is set to less than 15 degrees. By forming a gentle inclination angle θ of the tapered portion 45, it becomes easier for the outer circumference 35b of the large diameter portion 35 of the second connector portion 34 to come into contact with the tapered portion 45 and be tightened. Also, by forming a gentle inclination angle θ of the tapered portion 45, even when the cylindrical fixing device 4 moves in a direction that loosens, that is, in the above configuration, when the large diameter portion 35 of the second connector portion 34 and the inner circumference 46b of the small diameter portion 46 move relatively away from each other in the axial direction Ax, it becomes easier to maintain contact between the large diameter portion 35 and the tapered portion 45, and the cylindrical fixing device 4 can be fixed more firmly than in the conventional configuration.

[0067] Furthermore, the medical connecting member 1 of this embodiment includes a first connector portion 24 having a male screw portion 25 formed on the outer circumference of the first end portion 22 which is on one side S1 in the axial direction Ax; a second connector portion 34 provided on one side S1 of the second end portion 32 on the other side S2 in the axial direction Ax and having a large diameter portion 35 formed to protrude radially outward from the outer circumference; and a cylindrical fixing device 4 that tightens and fixes the connecting portion 5, to which the first end portion 22 of the first connector portion 24 and the second end portion 32 of the second connector portion 34 are connected, from the outside. The cylindrical fixing device 4 has, on its inner circumference, a female threaded portion 43 that screws into the male threaded portion 25 of the first connector portion 24, a tapered portion 45 formed on one side S1 in the axial direction Ax from the female threaded portion 43, the inner diameter of the portion on the other side S2 in the axial direction Ax being larger than the outer diameter of the outer circumference 35b of the large diameter portion 35 and tapering toward one side S1 in the axial direction Ax, and a small diameter portion 46 formed on one side S1 in the axial direction Ax from the tapered portion 45 and having an inner circumference 46b that can abut against the outer circumference 35b of the large diameter portion 35. The tapered portion 45 includes a first tapered portion 45a formed continuously with the end of the small diameter portion 46 on the other side S2 in the axial direction Ax, and a second tapered portion 45b formed continuously with the end of the first tapered portion 45a on the other side S2 in the axial direction Ax. The first inclination angle θ1 of the first tapered portion 45a with respect to the axial Ax is less than 15 degrees, and the second inclination angle θ2 of the second tapered portion 45b with respect to the axial Ax is smaller than the first inclination angle θ1. The small diameter portion 46 has an inner diameter of the inner circumference portion 46b that is equal to or smaller than the outer diameter of the outer circumference portion 35b of the large diameter portion 35, and the axial length of the small diameter portion 46 is shorter than the axial length of the tapered portion 45. With the above configuration, the connection portion 5, to which the first end portion 22 of the first connector portion 24 and the second end portion 32 of the second connector portion 34 are connected, can be firmly fixed by screwing the cylindrical fixing device 4. In addition, the outer circumference 35b of the large diameter portion 35 comes into contact with the inner circumference 46b of the small diameter portion 46 or the inner circumference of the first tapered portion 45a, which generates frictional resistance against circumferential movement in the direction that would loosen the cylindrical fixing device 4, thereby suppressing loosening of the cylindrical fixing device 4. Furthermore, in the above configuration, the axial length of the small-diameter portion 46 is shorter than the axial length of the tapered portion 45. As a result, compared to the conventional case where the axial length of the small-diameter portion 46 is longer, the large-diameter portion 35 of the second connector portion 34 is more easily inserted into the inner circumference portion 46b of the small-diameter portion 46, and a state in which the outer circumference portion 35b of the large-diameter portion 35 makes surface contact with the inner circumference portion 46b of the small-diameter portion 46 and is tightened is formed more easily than in the conventional case. Furthermore, in the above configuration, the tapered portion 45 includes a first tapered portion 45a and a second tapered portion 45b formed on the first tapered portion 45a, and the second inclination angle θ2 of the second tapered portion 45b is smaller than the first inclination angle θ1 of the first tapered portion 45a. By providing a gently inclined second tapered portion 45b on the other side S2 of the first tapered portion 45a, the radial gap that occurs between the large diameter portion 35 and the inner circumference of the tapered portion 45 when inserting the second connector portion 34 into the tapered portion 45 is reduced compared to the case where the entire tapered portion 45 has a first inclination angle θ1. This makes it less likely that the second connector portion 34 will be inserted into the cylindrical fixing device 4 at an angle.

[0068] Furthermore, the medical connecting member 1 of this embodiment includes a first connector portion 24 having a male screw portion 25 formed on the outer circumference of the first end portion 22 which is on one side S1 in the axial direction Ax; a second connector portion 34 provided on one side S1 of the second end portion 32 on the other side S2 in the axial direction Ax and having a large diameter portion 35 formed to protrude radially outward from the outer circumference; and a cylindrical fixing device 4 that tightens and fixes the connecting portion 5, to which the first end portion 22 of the first connector portion 24 and the second end portion 32 of the second connector portion 34 are connected, from the outside. The cylindrical fixing device 4 has, on its inner circumference, a female threaded portion 43 that screws into the male threaded portion 25 of the first connector portion 24, a tapered portion 45 formed on one side S1 in the axial direction Ax from the female threaded portion 43, the inner diameter of the portion on the other side S2 in the axial direction Ax being larger than the outer diameter of the outer circumference 35b of the large diameter portion 35 and tapering toward one side S1 in the axial direction Ax, and a small diameter portion 46 formed on one side S1 in the axial direction Ax from the tapered portion 45 and having an inner circumference 46b that can abut against the outer circumference 35b of the large diameter portion 35. The tapered portion 45 has an inclination angle θ with respect to the axial direction Ax of less than 15 degrees. The small diameter portion 46 has an inner diameter of the inner circumference portion 46b that is smaller than the outer diameter of the outer circumference portion 35b of the large diameter portion 35, and is greater than 95 and less than 100 when the outer diameter of the outer circumference portion 35b of the large diameter portion 35 is set to 100, and the axial length of the small diameter portion 46 is shorter than the axial length of the tapered portion 45. With the above configuration, the connection portion 5, to which the first end portion 22 of the first connector portion 24 and the second end portion 32 of the second connector portion 34 are connected, can be firmly fixed by screwing the cylindrical fixing device 4. In addition, the outer circumference 35b of the large diameter portion 35 comes into contact with the inner circumference 46b of the small diameter portion 46 or the inner circumference of the tapered portion 45, creating frictional resistance against circumferential movement in the direction that would loosen the cylindrical fixing device 4, thereby suppressing loosening of the cylindrical fixing device 4. Furthermore, in the above configuration, the axial length of the small-diameter portion 46 is shorter than the axial length of the tapered portion 45. As a result, compared to the conventional case where the axial length of the small-diameter portion 46 is longer, the large-diameter portion 35 of the second connector portion 34 is more easily inserted into the inner circumference portion 46b of the small-diameter portion 46, and a state in which the outer circumference portion 35b of the large-diameter portion 35 makes surface contact with the inner circumference portion 46b of the small-diameter portion 46 and is tightened is formed more easily than in the conventional case. Furthermore, in the above configuration, the axial length of the tapered portion 45 is increased compared to the conventional configuration, and the inclination angle θ of the tapered portion 45 is set to less than 15 degrees. By forming a gentle inclination angle θ of the tapered portion 45, it becomes easier for the outer circumference 35b of the large diameter portion 35 of the second connector portion 34 to come into contact with the tapered portion 45 and be tightened. Also, by forming a gentle inclination angle θ of the tapered portion 45, even when the cylindrical fixing device 4 moves in a direction that loosens, that is, in the above configuration, when the large diameter portion 35 of the second connector portion 34 and the inner circumference 46b of the small diameter portion 46 move relatively away from each other in the axial direction Ax, it becomes easier to maintain contact between the large diameter portion 35 and the tapered portion 45, and the cylindrical fixing device 4 can be fixed more firmly than in the conventional configuration.

[0069] (Examples) The following describes a measurement test of the loosening angle related to an embodiment of a medical connecting component. First, as a specimen of the embodiment, a medical connecting member having the following configuration was prepared. The medical connecting member of the embodiment comprises a first connector portion having a male screw portion on the outer circumference of the first end, which is on one side in the axial direction; a second connector portion provided on one side of the second end, which is on the other side in the axial direction, and having a large-diameter portion formed to protrude radially outward from the outer circumference; and a cylindrical fixing device that tightens and fixes the connecting portion to which the first end and the second end are connected from the outside. The cylindrical fixing device of the embodiment has on its inner circumference a female screw portion that screws into the male screw portion, a tapered portion formed on one side in the axial direction from the female screw portion, the inner diameter of the portion on the other side in the axial direction being larger than the outer diameter of the outer circumference of the large-diameter portion, and tapering toward one side in the axial direction, and a small-diameter portion formed on one side in the axial direction from the tapered portion, having an inner circumference that can contact the outer circumference of the large-diameter portion. In the embodiment, the tapered portion has an inclination angle of less than 15 degrees with respect to the axial direction, the inner diameter of the inner circumference of the small diameter portion is Φ5.95 +0.05 / -0.1 mm, and the outer diameter of the outer circumference of the large diameter portion is Φ6 +0.05 / 0 mm. In the embodiment, the axial length of the small diameter portion is shorter than the axial length of the tapered portion, and the ratio to the axial length of the tapered portion (axial length of the small diameter portion / axial length of the tapered portion) satisfies the condition of being between 0.01 and 0.5.

[0070] On the other hand, medical connecting members with the following configurations were prepared as samples for Comparative Examples 1 and 2. The medical connecting member of Comparative Example 1 is a product that corresponds to a configuration in which the second portion that accommodates the large-diameter portion of the second connector and engages with the outer circumference of the large-diameter portion does not have a tapered portion or a small-diameter portion in the inner circumference of the cylindrical fixing device.

[0071] The medical connecting member of Comparative Example 2 is a product treated as the connecting member of the present invention in Patent Documents 1 and 2. In the product of Comparative Example 2, the axial length of the portion (straight portion) that contacts the outer circumference of the large-diameter portion of the second connector portion on the inner circumference of the cylindrical fixing device is longer than the axial length of the small-diameter portion in the embodiment. In addition, in the product of Comparative Example 2, the inclination angle of the tapered portion formed on the other side of the straight portion on the inner circumference of the cylindrical fixing device is larger than the inclination angle of the tapered portion in the embodiment.

[0072] In the tests relating to the examples, each specimen of Example, Comparative Example 1, and Comparative Example 2 was pressed into the second connector portion, then packaged in a sterile bag, and AC sterilization was performed using a retort AC sterilizer (Hirayama Seisakusho, High-Pleap HV-50) at 115°C for 20 minutes. After the above sterilization, the specimens were dried at room temperature for at least one day.

[0073] Subsequently, each dried specimen was attached to a digital torque meter (Tohnichi, 3TME50CN2) via a jig supporting the first connector side, and a test was conducted to measure the loosening angle when the cylindrical fastener loosened by applying torque to the specimen through the jig. In the test, the loosening angle was measured for eight specimens each for Example, Comparative Examples 1 and 2. The ambient temperature during the test was 23±2℃.

[0074] In the test, each specimen was fastened using only the torque of the cylindrical fastener, with the first and second connector sections lightly in contact and no thrust applied. The fastening torque of the cylindrical fastener in each specimen was set to 11-12 N·cm, based on ISO 80369-7, ISO 80369-20, etc. In the test, after reaching the specified torque during fastening, the torque was immediately released and the value of the fastening torque was recorded. When releasing the torque in the test, no axial force was applied to the specimen; the loosening action was performed solely using the torque of the cylindrical fastener.

[0075] During the test, the specimens were marked at predetermined positions on the tubular fastener and the first connector after tightening. When loosening the tubular fastener, the amount of rotational displacement of the tubular fastener was obtained based on the amount of movement of the marks on the tubular fastener. In addition, the maximum torque applied when loosening the tubular fastener after tightening, and the amount of movement of the marks at the position where no torque was applied were recorded during the test.

[0076] The loosening angle θ of the cylindrical fastener can be calculated from the following formula (1), which determines the angle from the chord measurement result between two points on the circumference, as shown in Figure 8. θ = (Asin(x / D) * 2) * (180 / π) ……(1) However, in equation (1), D represents the diameter and x represents the chord length.

[0077] Figure 9 shows the results of the loosening angle measurement tests in the example and comparative examples 1 and 2. The vertical axis in Figure 9 represents angle (°). For comparative examples 1 and 2, for the samples that loosened instantaneously when torque was applied, the chord length was set to 0.5 mm for convenience, and the loosening angle was calculated as 5.7°.

[0078] In the test, the distribution of tightening torque in Comparative Example 1 was 11.35-11.65 (N·cm), and the average tightening torque in Comparative Example 1 was 11.51 (N·cm). The distribution of loosening angles in Comparative Example 1 was 5.7°-5.7°, and the average loosening angle in Comparative Example 1 was 5.7°.

[0079] Furthermore, the distribution of fastening torque in Comparative Example 2 was 11.35-11.55 (N·cm), and the average value of the fastening torque in Comparative Example 2 was 11.44 (N·cm). The distribution of loosening angles in Comparative Example 2 was 5.7°-76.6°, and the average value of the loosening angle in Comparative Example 2 was 20.8°.

[0080] On the other hand, the distribution of fastening torque in the examples was 11.40-11.70 (N·cm), and the average value of the fastening torque in the examples was 11.54 (N·cm). The distribution of loosening angles in the examples was 71.5°-90.9°, and the average value of the loosening angle in the examples was 77.8°.

[0081] The larger the loosening angle value, the greater the amount of rotation required for the tubular fastener to lose torque, and the less likely the tubular fastener of the medical connecting member is to loosen. When comparing the average values ​​of the loosening angles, the loosening angles tend to increase in the order of Comparative Example 1, Comparative Example 2, and the Example. Therefore, it can be seen that the configuration of the Example is less likely to loosen compared to the configurations of Comparative Examples 1 and 2.

[0082] In the test, a singularity (loosening angle of 78.6°) occurred in the measurement results of Comparative Example 2. This singularity is thought to be due to the contact between the female threaded portion of the cylindrical fastener and the male threaded portion of the first connector. However, even if the singularity result is included in Comparative Example 2, the average loosening angle is larger in the embodiment than in Comparative Example 2, and it can be said that the cylindrical fastener is less likely to loosen according to the configuration of the embodiment.

[0083] The present invention is not limited to the embodiments described above, and various improvements and design modifications may be made without departing from the spirit of the invention.

[0084] In the above embodiment, an example was described in which the large-diameter portion 34 of the second connector portion 34 is inserted into the inner circumference 46b of the small-diameter portion 46, and the outer circumference 35b of the large-diameter portion 35 makes surface contact with the inner circumference 46b of the small-diameter portion 46 and is tightened. However, as a modification of the above embodiment, the medical connecting member 1 may be configured such that the large-diameter portion 34 of the second connector portion 34 is not inserted into the small-diameter portion 46, and the outer circumference 35b of the large-diameter portion 35 is tightened by the tightening portion 40 of the first tapered portion 46a. The operation of the medical connecting member 1 as a modification will be described below, based on the description in the above embodiment.

[0085] A modified example of the above embodiment, the medical connecting member 1 comprises: a first connector portion 24 having a male threaded portion 25 formed on the outer circumference of the first end portion 22 which is on one side S1 in the axial direction Ax; a second connector portion 34 provided on one side S1 of the second end portion 32 on the other side S2 in the axial direction Ax, and having a large-diameter portion 35 formed to protrude radially outward from the outer circumference; and a cylindrical fixing device 4 that tightens and fixes the connecting portion 5, to which the first end portion 22 of the first connector portion 24 and the second end portion 32 of the second connector portion 34 are connected, from the outside. The cylindrical fixing device 4 has on its inner circumference a female threaded portion 43 that screws into the male threaded portion 25 of the first connector portion 24, and an engaging portion (second portion) 42 formed on one side S1 in the axial direction Ax from the female threaded portion 43, and that engages with the outer circumference 35b of the large-diameter portion 35 of the second connector portion 34. The engaging portion 42 has a tapered portion 45 in which the inner diameter of the portion on the other side S2 in the axial direction Ax is larger than the outer diameter of the outer circumference 35b of the large diameter portion 35 and is tapered toward one side S1 in the axial direction Ax, and a small diameter portion 46 formed continuously with the end of the tapered portion 45 on one side S1 in the axial direction Ax, with an inner diameter equal along the axial direction Ax. The tapered portion 45 has an inclination angle θ with respect to the axial direction Ax of less than 15 degrees. A clamping portion 40 is provided in the portion of the small diameter portion 46 from a predetermined position in the axial direction Ax to the end of the outer circumference 35b of the large diameter portion 35, with an inner diameter less than or equal to the outer diameter of the outer circumference 35b of the large diameter portion 35, and capable of contacting the outer circumference 35b of the large diameter portion 35. The axial length from the clamping portion 40 to the end of one side S1 in the axial direction Ax of the small diameter portion 46 is such that the ratio (axial length of clamping portion 40 / axial length of tapered portion 45) is 0.03 or more and 0.3 or less. With the above configuration, the connection portion 5, to which the first end 22 of the first connector portion 24 and the second end 32 of the second connector portion 34 are connected, can be firmly fixed by screwing the cylindrical fixing device 4. In addition, the outer circumference 35b of the large diameter portion 35 comes into contact with the inner circumference of the tapered portion 45, creating frictional resistance against circumferential movement in the direction that would loosen the cylindrical fixing device 4, thereby suppressing loosening of the cylindrical fixing device 4. Furthermore, the axial length from the clamping portion 40 to the end of one side S1 in the axial direction Ax of the small diameter portion 46 is such that the ratio to the axial length of the tapered portion 45 (axial length of the clamping portion 40 / axial length of the tapered portion 45) is 0.03 or more and 0.3 or less, and the inclination angle θ of the tapered portion 45 is less than 15 degrees. By forming the tapered portion 45 with a gentle inclination angle, the outer circumference 35b of the large diameter portion 35 of the second connector portion 34 is more likely to come into contact with the clamping portion 40 of the tapered portion 45 and be tightened. Furthermore, because the tapered portion 45 is formed with a gentle inclination angle, even if the cylindrical fixing device 4 moves in a direction that loosens it, that is, in the above configuration, even if the large diameter portion 35 of the second connector portion 34 and the inner circumference portion 46b of the small diameter portion 46 move relatively away from each other in the axial direction Ax, it becomes easier to maintain contact between the large diameter portion 35 and the tapered portion 45, and the cylindrical fixing device 4 can be fixed more firmly than in the conventional method.

[0086] In the above embodiment, an example configuration was described in which the female connector member 2 has two first connector portions 24. However, the female connector member 2 may have a single-tube configuration with only one first connector portion 24, or a branched-tube configuration with three or more first connector portions 24. Furthermore, the male connector member 3 may have a branched-tube configuration with multiple second connector portions 34.

[0087] In the above embodiment, an example was described in which the tapered portion 45 formed on the second portion 42 of the cylindrical fixing device 4 includes a first tapered portion 45a and a second tapered portion 45b, each having different inclination angles θ1 and θ2 with respect to the axial direction Ax. However, the tapered portion 45 may also be configured such that the inclination angle θ with respect to the axial direction Ax is the same throughout the entire tapered portion 45 in the axial direction Ax.

[0088] Furthermore, the embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended to be included.

[0089] Furthermore, the disclosure of the above embodiments encompasses the following technical concepts. (1) A first connector portion having a male threaded portion formed on the outer circumference of the first end portion which is on one side in the axial direction; a second connector portion provided on one side of the second end portion which is on the other side in the axial direction and having a large diameter portion formed to protrude radially outward from the outer circumference; and a cylindrical fixing device that tightens and fixes the connection portion to which the first end portion of the first connector portion and the second end portion of the second connector portion are connected from the outside, wherein the cylindrical fixing device has a female threaded portion on its inner circumference which screws into the male threaded portion of the first connector portion, and is formed on one side in the axial direction from the female threaded portion, and the inner diameter of the portion on the other side in the axial direction is larger than the outer diameter of the outer circumference of the large diameter portion A medical connecting member having a large tapered portion that is tapered toward one side in the axial direction, and a small diameter portion formed on one side in the axial direction from the tapered portion and having an inner circumference that can abut against the outer circumference of the large diameter portion, wherein the tapered portion has an inclination angle of less than 15 degrees with respect to the axial direction, the inner diameter of the inner circumference of the small diameter portion is equal to or smaller than the outer diameter of the outer circumference of the large diameter portion, the axial length of the small diameter portion is shorter than the axial length of the tapered portion, and the ratio of the small diameter portion to the axial length of the tapered portion (axial length of the small diameter portion / axial length of the tapered portion) is 0.01 or more and 0.5 or less. (2) The medical connecting member according to (1) above, wherein the tapered portion has a first tapered portion formed continuously with the other end of the small diameter portion in the axial direction, the axial length of the small diameter portion is shorter than the axial length of the first tapered portion, and the ratio of the small diameter portion to the axial length of the first tapered portion (axial length of the small diameter portion / axial length of the first tapered portion) is 0.05 or more and 0.3 or less. (3) The medical connecting member according to (2) above, wherein the first tapered portion has a first inclination angle with respect to the axial direction of 3 degrees or more and less than 15 degrees, and the tapered portion further includes a second tapered portion formed continuously with respect to the other end of the first tapered portion in the axial direction, and the second inclination angle of the second tapered portion with respect to the axial direction is smaller than the first inclination angle of the first tapered portion. (4) The medical connecting member according to (3) above, wherein the second inclination angle of the second tapered portion is less than 3 degrees. (5) The inner diameter of the inner circumference of the small diameter portion is equal along the axial direction, as described in any one of the above items (1) to (4). (6) The medical connecting member as described in (5) above, wherein the inner diameter of the inner circumference of the small diameter portion is greater than 95 and less than 100 when the outer diameter of the outer circumference of the large diameter portion is set to 100. (7) The medical connecting member according to (6) above, wherein the cylindrical fixing device further has an enlarged diameter portion formed on its inner circumference on the other side in the axial direction from the tapered portion and enlarged toward the other side in the axial direction. (8) The medical connecting member according to any one of the above items (1) to (7), wherein the ratio of the axial length of the small diameter portion to the inner diameter of the inner circumference portion (axial length of the small diameter portion / inner diameter of the inner circumference portion of the small diameter portion) is 0.03 or less. (9) A first connector portion having a male threaded portion formed on the outer circumference of the first end portion which is on one side in the axial direction; a second connector portion provided on one side of the second end portion which is on the other side in the axial direction and having a large diameter portion formed to protrude radially outward from the outer circumference; and a cylindrical fixing device that tightens and fixes the connection portion to which the first end portion of the first connector portion and the second end portion of the second connector portion are connected from the outside, wherein the cylindrical fixing device has a female threaded portion on its inner circumference which screws into the male threaded portion of the first connector portion, and a tapered portion formed on one side in the axial direction from the female threaded portion, the inner diameter of the portion on the other side in the axial direction is larger than the outer diameter of the outer circumference of the large diameter portion and the tapered portion which is tapered toward one side in the axial direction, and the tapered portion A medical connecting member having a small diameter portion formed on one side in the axial direction from the bar portion and having an inner circumference that can abut against the outer circumference of the large diameter portion, wherein the tapered portion includes a first tapered portion formed continuously with the other end in the axial direction of the small diameter portion and a second tapered portion formed continuously with the other end in the axial direction of the first tapered portion, the first inclination angle of the first tapered portion with respect to the axial direction being less than 15 degrees, the second inclination angle of the second tapered portion with respect to the axial direction being smaller than the first inclination angle, and the inner diameter of the inner circumference of the small diameter portion being equal to or smaller than the outer diameter of the outer circumference of the large diameter portion, and the axial length of the small diameter portion being shorter than the axial length of the tapered portion. (10) A first connector portion having a male threaded portion formed on the outer circumference of the first end portion which is on one side in the axial direction; a second connector portion provided on one side of the second end portion which is on the other side in the axial direction and having a large diameter portion formed to protrude radially outward from the outer circumference; and a cylindrical fixing device that tightens and fixes the connection portion to which the first end portion of the first connector portion and the second end portion of the second connector portion are connected from the outside, wherein the cylindrical fixing device has a female threaded portion on its inner circumference which screws into the male threaded portion of the first connector portion, and an inner diameter formed on one side in the axial direction from the female threaded portion which is on the other side in the axial direction A medical connecting member having a tapered portion which is larger than the outer diameter of the outer circumference of the large diameter portion and is tapered toward one side in the axial direction, and a small diameter portion which is formed on one side in the axial direction from the tapered portion and has an inner circumference that can abut against the outer circumference of the large diameter portion, wherein the tapered portion has an inclination angle of less than 15 degrees with respect to the axial direction, and the inner diameter of the inner circumference of the small diameter portion is smaller than the outer diameter of the outer circumference of the large diameter portion, and is greater than 95 and less than 100 when the outer diameter of the outer circumference of the large diameter portion is set to 100, and the axial length of the small diameter portion is shorter than the axial length of the tapered portion. (11) A first connector portion having a male threaded portion formed on the outer circumference of the first end portion which is on one side in the axial direction; a second connector portion provided on one side of the second end portion which is on the other side in the axial direction and having a large diameter portion formed to protrude radially outward from the outer circumference; and a cylindrical fixing device that tightens and fixes the connection portion to which the first end portion of the first connector portion and the second end portion of the second connector portion are connected from the outside, wherein the cylindrical fixing device has a female threaded portion on its inner circumference which screws into the male threaded portion of the first connector portion, and an engaging portion formed on one side in the axial direction from the female threaded portion which engages with the outer circumference of the large diameter portion of the second connector portion, wherein the inner diameter of the part on the other side in the axial direction is the outer circumference of the large diameter portion A medical connecting member having a tapered portion that is larger than the outer diameter of the first tapered portion and is tapered toward one side in the axial direction, and a small diameter portion formed continuously with respect to the axial end of the tapered portion and having an inner diameter equal along the axial direction, wherein the tapered portion has an inclination angle of less than 15 degrees with respect to the axial direction, and a clamping portion is provided in the portion from a predetermined axial position of the first tapered portion to the other axial end of the small diameter portion, the inner diameter of which is less than or equal to the outer diameter of the outer circumference of the large diameter portion and which can contact the outer circumference of the large diameter portion, and the axial length from the clamping portion to the axial end of the small diameter portion has a ratio (axial length of the clamping portion / axial length of the tapered portion) of 0.03 or more and 0.3 or less. (12) The medical connecting member according to (11) above, wherein the tapered portion has a first tapered portion formed continuously with the other end of the small diameter portion in the axial direction, and the fastening portion is provided on the first tapered portion. (13) The boundary portion between the tapered portion and the small diameter portion is formed in a curved shape that is convex toward the axial side, as described in any one of (1) to (12) above, for medical connection member. [Explanation of symbols]

[0090] 1...Medical connecting member, 2...Female connector member, 3...Male connector member, 4...Cylindrical fixing device, 5...Connecting part, 21...First tube receiving part, 22...First end part, 23...Pipeline, 23a...Main pipeline, 23b...Branch pipeline, 24...First connector part, 25...Male threaded part, 31...Second tube receiving part, 32...Second end part, 33...Pipeline, 34...Second connector part, 35...Large diameter part, 35a...Notch part, 35b...Outer circumference part, 40...Tightening part, 41...First part, 42...Second part (engaging part), 43...Female threaded part, 44...Enlarged diameter part, 45...Tapered part, 45a...First tapered part, 45b...Second tapered part, 46...Small diameter part, 46b...Inner circumference part, 47...Stepped part, 47a...Stepped surface, 48...Notch part

Claims

1. A first connector portion having a male threaded portion formed on the outer circumference of the first end side which is on one side in the axial direction, A second connector portion is provided on one side of the second end on the other side in the axial direction and has a large diameter portion that protrudes radially outward from the outer circumference, The device comprises a cylindrical fastener that tightens and secures the connection portion, to which the first end of the first connector portion and the second end of the second connector portion are connected, from the outside. The cylindrical fixing device has, on its inner circumference, The female screw portion of the first connector portion engages with the male screw portion, A tapered portion is formed on one side in the axial direction from the female thread portion, the inner diameter of the portion on the other side in the axial direction is larger than the outer diameter of the outer circumference of the large diameter portion, and the diameter is reduced toward one side in the axial direction. It has a smaller diameter portion formed on one side in the axial direction from the tapered portion, and having an inner diameter portion that can come into contact with the outer diameter portion of the larger diameter portion, The tapered portion has an inclination angle of less than 15 degrees with respect to the axial direction. The aforementioned small diameter portion is The inner diameter of the inner circumference is equal to the outer diameter of the outer circumference of the large diameter portion, or is smaller than the outer diameter of the outer circumference. The axial length of the small diameter portion is shorter than the axial length of the tapered portion, and the ratio of the small diameter portion to the axial length of the tapered portion (axial length of the small diameter portion / axial length of the tapered portion) is between 0.01 and 0.

5. Medical connecting components.

2. The tapered portion has a first tapered portion formed continuously with the other end of the small diameter portion in the axial direction, The axial length of the small diameter portion is shorter than the axial length of the first tapered portion, and the ratio of the small diameter portion to the axial length of the first tapered portion (axial length of the small diameter portion / axial length of the first tapered portion) is 0.05 or more and 0.3 or less. The medical connecting member according to claim 1.

3. The first tapered portion has a first inclination angle of 3 degrees or more and less than 15 degrees with respect to the axial direction. The tapered portion further includes a second tapered portion formed continuously with the other end of the first tapered portion in the axial direction, The second inclination angle of the second tapered portion with respect to the axial direction is smaller than the first inclination angle of the first tapered portion. The medical connecting member according to claim 2.

4. The second inclination angle of the second tapered portion is less than 3 degrees. The medical connecting member according to claim 3.

5. The inner diameter of the inner circumference of the small diameter portion is equal along the axial direction. The medical connecting member according to claim 1.

6. The inner diameter of the inner circumference of the small diameter portion is greater than 95 and less than 100 when the outer diameter of the outer circumference of the large diameter portion is set to 100. The medical connecting member according to claim 5.

7. The cylindrical fixing device further has an enlarged diameter portion on its inner circumference, which is formed on the other side in the axial direction from the tapered portion and is enlarged toward the other side in the axial direction. The medical connecting member according to claim 6.

8. The axial length of the small diameter portion is such that its ratio to the inner diameter of the inner circumference portion (axial length of the small diameter portion / inner diameter of the inner circumference portion of the small diameter portion) is 0.03 or less. The medical connecting member according to claim 1.

9. A first connector portion having a male threaded portion formed on the outer circumference of the first end side which is on one side in the axial direction, A second connector portion is provided on one side of the second end on the other side in the axial direction and has a large diameter portion that protrudes radially outward from the outer circumference, The device comprises a cylindrical fastener that tightens and secures the connection portion, to which the first end of the first connector portion and the second end of the second connector portion are connected, from the outside. The cylindrical fixing device has, on its inner circumference, The female screw portion of the first connector portion engages with the male screw portion, A tapered portion is formed on one side in the axial direction from the female thread portion, the inner diameter of the portion on the other side in the axial direction is larger than the outer diameter of the outer circumference of the large diameter portion, and the diameter is reduced toward one side in the axial direction. It has a smaller diameter portion formed on one side in the axial direction from the tapered portion, and having an inner diameter portion that can come into contact with the outer diameter portion of the larger diameter portion, The tapered portion is, It includes a first tapered portion formed continuously with the other axial end of the small diameter portion, and a second tapered portion formed continuously with the other axial end of the first tapered portion, The first inclination angle of the first tapered portion with respect to the axial direction is less than 15 degrees. The second inclination angle of the second tapered portion with respect to the axial direction is smaller than the first inclination angle. The aforementioned small diameter portion is The inner diameter of the inner circumference portion is equal to or smaller than the outer diameter of the outer circumference portion of the large diameter portion, and the axial length of the small diameter portion is shorter than the axial length of the tapered portion. Medical connecting components.

10. A first connector portion having a male threaded portion formed on the outer circumference of the first end side which is on one side in the axial direction, A second connector portion is provided on one side of the second end on the other side in the axial direction and has a large diameter portion that protrudes radially outward from the outer circumference, The device comprises a cylindrical fastener that tightens and secures the connection portion, to which the first end of the first connector portion and the second end of the second connector portion are connected, from the outside. The cylindrical fixing device has, on its inner circumference, The female screw portion of the first connector portion engages with the male screw portion, A tapered portion is formed on one side in the axial direction from the female thread portion, the inner diameter of the portion on the other side in the axial direction is larger than the outer diameter of the outer circumference of the large diameter portion, and the diameter is reduced toward one side in the axial direction. It has a smaller diameter portion formed on one side in the axial direction from the tapered portion, and having an inner diameter portion that can come into contact with the outer diameter portion of the larger diameter portion, The tapered portion has an inclination angle of less than 15 degrees with respect to the axial direction. The aforementioned small diameter portion is The inner diameter of the inner circumference is smaller than the outer diameter of the outer circumference of the large diameter portion, and is greater than 95 and less than 100 when the outer diameter of the outer circumference of the large diameter portion is set to 100. The axial length of the small-diameter portion is shorter than the axial length of the tapered portion. Medical connecting components.

11. A first connector portion having a male threaded portion formed on the outer circumference of the first end side which is on one side in the axial direction, A second connector portion is provided on one side of the second end on the other side in the axial direction and has a large diameter portion that protrudes radially outward from the outer circumference, The device comprises a cylindrical fastener that tightens and secures the connection portion, to which the first end of the first connector portion and the second end of the second connector portion are connected, from the outside. The cylindrical fixing device has, on its inner circumference, The female screw portion of the first connector portion engages with the male screw portion, It has an engaging portion formed on one side in the axial direction from the female screw portion, which engages with the outer circumference of the large diameter portion of the second connector portion, The aforementioned engaging portion is The inner diameter of the portion on the other side in the axial direction is larger than the outer diameter of the outer circumference of the large diameter portion, and the tapered portion is tapered toward one side in the axial direction, A small diameter portion is formed continuously at one end of the tapered portion in the axial direction, and the inner diameter is equal along the axial direction. The tapered portion has an inclination angle of less than 15 degrees with respect to the axial direction. A clamping portion is provided in the portion from a predetermined axial position of the tapered portion to the other axial end of the small diameter portion, the inner diameter of which is less than or equal to the outer diameter of the outer circumference of the large diameter portion, and which is capable of contacting the outer circumference of the large diameter portion. The axial length from the clamping portion to one end of the small diameter portion in the axial direction is such that the ratio of the axial length of the tapered portion (axial length of the clamping portion / axial length of the tapered portion) is 0.03 or more and 0.3 or less. Medical connecting components.

12. The tapered portion has a first tapered portion formed continuously with the other end of the small diameter portion in the axial direction, The clamping portion is provided on the first tapered portion. The medical connecting member according to claim 11.

13. The boundary portion between the tapered portion and the small diameter portion is formed in a curved shape that is convex toward the axial center. A medical connecting member according to any one of claims 1 to 12.

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