Catheter hub and catheter assembly

Abstract

A catheter hub and a catheter assembly are provided that can improve the visibility of an object being introduced into a catheter. [Solution] The hub body 22 has an inner lumen 21, a strain mounting portion 24 formed on the secondary side of the hub body 22 and for mounting a strain relief 13, and a catheter mounting portion 25 formed inside the secondary side of the hub body 22 and for mounting a catheter 11 so as to protrude from the strain relief 13 mounted on the strain mounting portion 24 to the primary side. The hub body 22 has a viewing portion 27 formed on the primary side of the catheter 11 mounted on the catheter mounting portion 25, which is transparent all around and has smooth surfaces on both the inside and outside, and is configured to allow the object being introduced into the inner lumen 21 into the catheter 11 to be visible from all around.

Description

[Technical Field]

[0001] The present invention relates to a catheter hub and a catheter assembly. [Background technology]

[0002] Conventionally, there has been a transparent, cylindrical catheter hub that connects a catheter and a syringe (see Patent Document 1). This catheter hub has a proximal attachment section and a distal attachment section, and a hollow section formed across the proximal attachment section and the distal attachment section, with the proximal attachment section having a base end fitting section for fitting with the tip of a syringe, and the distal attachment section having a straight tip section for fitting with a catheter (sheath). This catheter hub is entirely transparent, allowing the interior to be seen. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6500410 Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventional catheter hubs have a plate-like portion formed on the outer surface near the base end (proximal end) of the catheter fitted into the straight tip section, which makes it difficult to see the object being introduced into the catheter.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a catheter hub and a catheter assembly that can improve the visibility of an object being introduced into a catheter. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention provides a catheter hub for connecting a catheter to a medical device, comprising: a hub body having an internal cavity; an instrument connection section formed on the outer peripheral surface of the primary side of the hub body and for connecting the medical device; a strain attachment section formed on the secondary side of the hub body and for attaching a strain relief; and a catheter attachment section formed inside the secondary side of the hub body and for attaching the catheter so that it protrudes from the strain relief attached to the strain attachment section on the primary side. a wing provided on the outer peripheral surface of the hub body; The hub body includes a catheter mounting portion. at least The primary side From the end face of the The catheter has a transparent section that is smooth on both the inside and outside and is transparent over the entire circumference, and a visual confirmation section is formed that allows the object being introduced into the catheter in the lumen to be visually confirmed from the entire circumference. The wing is formed so as to be offset in the axial direction toward the primary side with respect to the viewing portion, and the viewing portion is formed in a cylindrical or hollow spherical shape and has a thickness that allows the introduced object to be magnified by a magnification of at least a predetermined magnification by a lens effect. The term "transparent" as used herein includes both colorless and transparent and colored and transparent.

[0007] In order to achieve the above object, the present invention also provides a catheter and a Note The tetlhub and the front The strain attachment part is attached to the Equipped with strain relief and Ta The present invention provides a catheter assembly characterized by: [Effects of the Invention]

[0008] The catheter hub and catheter assembly according to the present invention can improve the visibility of the substance being introduced into the catheter. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a front view of a catheter hub according to an embodiment of the present invention. [Figure 2] 2 is a cross-sectional view of the catheter taken along line A-A' in FIG. 1. [Figure 3] FIG. 1(a) is a perspective view showing a catheter hub, FIG. 1(b) is a front view showing the catheter hub, and FIG. 1(c) is a plan view showing the catheter hub. [Figure 4] 3(a) is a cross-sectional view taken along line B-B' in FIG. 3(b) showing the catheter hub, and FIG. 3(b) is a cross-sectional view taken along line CC' in FIG. 3(b) showing the catheter hub. [Figure 5] (a) is an explanatory diagram for explaining the magnified viewing due to the lens effect in the viewing area, (b) is a cross-sectional view of line A-A' in Figure 1 showing the area around the viewing area, and (c) is a schematic diagram showing the state in which the area around the viewing area is magnified due to the lens effect. [Figure 6] (a) is a graph showing the experimental results of the relationship between the thickness of the visible portion and the magnification due to the lens effect, and (b) is a table showing the comparison results of the visibility of the introduced object in the examples and comparative examples. [Figure 7] 7(a) is a front view showing a modified catheter hub, (b) is a plan view showing a modified catheter hub, and (c) is a cross-sectional view of the modified catheter hub taken along line D-D' in FIG. 7(a). DETAILED DESCRIPTION OF THE INVENTION

[0010] A catheter hub according to one embodiment of the present invention and a catheter assembly including the same will be described below with reference to the accompanying drawings. This catheter assembly comprises a catheter hub attached to the end of a catheter. In particular, this catheter assembly employs a visualizing structure in the catheter hub that allows easy viewing of an object being introduced into the catheter. The following description will be given with reference to the left and right, front and back, and up and down, as shown in the drawings. In this embodiment, the left and right directions coincide with the axial direction of the catheter hub, with the primary side of the catheter hub on the right side and the secondary side of the catheter hub on the left side.

[0011] (Configuration of catheter assembly) 1, the catheter assembly 1 includes a catheter 11, a catheter hub 12 attached to one end (proximal end) of the catheter 11, and a strain relief 13 attached to the end of the catheter hub 12 on the catheter 11 side to protect the catheter 11. The catheter hub 12 connects a medical device 2 to the primary side (right side) and joins the end of the catheter 11 to the secondary side (left side), thereby connecting the catheter 11 to the medical device 2.

[0012] As an example of the medical device 2, it is assumed that a syringe or injector for supplying a vascular embolization substance is connected. That is, as an example, it is assumed that the catheter assembly 1 is used for vascular embolization, in which an embolic substance is injected into a blood vessel to embolize the blood vessel. As the vascular embolization substance, for example, a cyanoacrylate adhesive such as N-butyl-2-cyanoacrylate (NBCA) or ethylene vinyl alcohol copolymer (EVOH) can be used. In such a case, the embolic substance is an example of an object 3 to be introduced into the catheter 11.

[0013] It is also assumed that a coil introduction aid for introducing an embolization coil is connected as an example of the medical device 2. That is, as an example, it is assumed that the catheter assembly 1 is used for vascular embolization, which introduces an embolization coil into a blood vessel to embolize the blood vessel.

[0014] It is also assumed that a wire introduction aid for introducing a guidewire is connected as an example of the medical device 2. In such a case, the guidewire is an example of the object 3 to be introduced into the catheter 11. In such a case, the guidewire may be introduced into the catheter 11 while the wire introduction aid is held by hand.

[0015] The medical device 2 also has a sheath tube 2a, and when introducing the introducer 3 into the catheter 11, the sheath tube 2a is inserted into the lumen 21 of the catheter hub 12, and the introducer 3 is supplied from the sheath tube 2a through the tip opening.

[0016] The catheter 11 is a colored tube with a colored, opaque outer layer, and in this embodiment, for example, a microcatheter with an inner diameter of 1 mm or less is assumed. One end of the catheter 11 is introduced into the patient's body, and the other end is fixed to a catheter hub 12 outside the patient's body. The object 3 introduced into the catheter 11 at the catheter hub 12 passes through the catheter 11 and is introduced into the patient's body. The catheter 11 may also be a transparent tube with a transparent outer layer.

[0017] The strain relief 13 is attached to the secondary (left) end of the catheter hub 12 and is made of a flexible or elastic material such as polyurethane resin or silicone resin. The strain relief 13 is provided to cover the left end of the catheter hub 12 and the catheter 11 near the catheter hub 12, thereby preventing the catheter 11 from bending at the connection between the catheter 11 and the catheter hub 12. The material of the strain relief 13 may be any flexible or elastic material, and may be a thermoplastic elastomer or a thermosetting elastomer.

[0018] (Catheter hub configuration) 2 to 4, the catheter hub 12 is formed from a single piece of transparent resin (e.g., amorphous polyamide resin) and includes a cylindrical hub body 22 having a lumen 21, an instrument connection section 23 formed on the outer peripheral surface of the primary side (right side) of the hub body 22 and for connecting a medical instrument 2, a strain attachment section 24 formed on the outer peripheral surface of the secondary side (left side) of the hub body 22 and for attaching a strain relief 13, a catheter attachment hole 25 formed inside the secondary side of the hub body 22 and for attaching the base end of the catheter 11, a pair of upper and lower wings 26 erected on the outer peripheral surface of the hub body 22, and a visualization section 27 formed on the right side of the catheter attachment hole 25 in the hub body 22 and allowing visualization of the introducer 3 being introduced into the catheter 11. The catheter attachment hole 25 is an example of a catheter attachment section.

[0019] The device connection part 23 has a thread or the like for connection, and is used to connect the medical device 2. The medical device 2 may be connected to the device connection part 23 directly, or may be connected to the device connection part 23 via a connector such as a three-way stopcock. A connector such as a three-way stopcock is also an example of the medical device 2 that is connected to the catheter 11 by the catheter hub 12.

[0020] The catheter mounting hole 25 is a mounting hole for mounting the base end (right end) of the catheter 11. For example, the catheter mounting hole 25 is configured as a fitting hole slightly larger in outer diameter than the base end of the catheter 11, and the base end of the catheter 11 is joined to the catheter mounting hole 25 by fitting the base end of the catheter 11 into the catheter mounting hole 25 and bonding the base end of the catheter 11 to the catheter mounting hole 25. Note that instead of bonding, the base end of the catheter 11 may be joined by laser welding or heat welding, or the base end of the catheter 11 may be attached to the position of the catheter mounting hole 25 by insert molding. In addition, the catheter mounting hole portion 25 is formed extending toward the primary side (right side) from the position of the strain mounting portion 24, and the catheter 11 is attached so that it protrudes toward the primary side from the strain relief 13 attached to the strain mounting portion 24.

[0021] The pair of wings 26, 26 are formed in a plate shape and erected at the upper and lower ends, respectively, of the outer peripheral surface of the hub body 22. The pair of wings 26, 26 are formed to be offset from the visual confirmation portion 27 on the primary side (right side) in the axial direction, so as not to overlap with the visual confirmation portion 27 in the axial direction. The pair of wings 26, 26 function as finger hooks and also as reinforcing ribs that reinforce the hub body 22.

[0022] The lumen 21 of the hub body 22 communicates at its secondary side (left side) end with the catheter 11 attached to the catheter attachment hole 25. The inner circumferential surface of the hub body 22 forming the lumen 21 has a large diameter at its primary side (right side) end to facilitate insertion of the sheath tube 2a of the medical device 2, but is formed into a tapered hole shape with a diameter that gradually decreases from the primary side toward the secondary side, and the secondary side end of the lumen 21 has the same diameter as the inner diameter of the catheter 11.

[0023] (Configuration of the visual recognition section) The visualization portion 27 is disposed adjacent to the right side of the catheter mounting hole 25, is cylindrical, transparent over its entire circumference, and has smooth inner and outer surfaces. That is, the visualization portion 27 is disposed adjacent to the primary side (right side) of the catheter 11 attached to the catheter mounting hole 25, and is configured to allow the object 3 being introduced into the catheter 11 in the lumen 21 to be visualized from the entire circumference. The visualization portion 27 is formed continuously on both the inner and outer sides without any steps in the axial direction, and has a length of 4 mm or more in the axial direction from the right end of the catheter 11 (the bottom surface of the catheter mounting hole 25), making it easy to visualize the state of the object 3 being introduced into the lumen 21. Note that the visualization portion 27 is preferably formed so as to not contain any air bubbles or gaps inside in order to enhance visibility.

[0024] As shown in FIGS. 5(a) to 5(c), the thickness (wall thickness) of the viewing portion 27 is such that the object 3 to be introduced in the lumen 21 can be enlarged by 1.5 times or more in the vertical direction (direction perpendicular to the axial direction) due to the lens effect. Specifically, as can be seen from the experimental results shown in FIG. 6(a), if the thickness of the viewing portion 27 is 1.27 mm or more, the object 3 to be introduced in the lumen 21 can be enlarged by 1.5 times or more. The viewing portion 27 has a thickness that varies at various positions in the axial direction due to the tapered hole shape of the inner peripheral surface of the hub body 22, but even the thinnest part has a thickness of 1.27 mm or more, and is configured to be enlarged by 1.5 times or more. The magnification due to the lens effect of the viewing portion 27 should be 1.4 times or more, preferably 1.45 times or more, and more preferably 1.5 times or more.

[0025] (Configuration of the intermediate part between the viewing part and the device connection part) Furthermore, the intermediate section 28 between the viewing section 27 and the device connection section 23 in the hub main body 22 is cylindrical, with both the inner and outer surfaces formed continuously and without any steps in the axial direction, and is transparent all around, forming a quasi-viewing section with smooth inner and outer surfaces. The intermediate section 28 is gradually thickened toward the viewing section 27, to the same thickness as the viewing section 27. This gradually increases the magnification of the object 3 due to the lens effect at least near the viewing section 27, and the transition in magnification between the viewing section 27 and the intermediate section 28 is continuous. This significantly changes the magnification due to the lens effect the moment the object 3 enters the viewing section 27, preventing the object 3 from being lost.

[0026] The intermediate section 28 functions as a sheath tube viewing section into which the sheath tube 2a of the medical device 2 is inserted from the primary side and which is configured to enable the sheath tube 2a inserted into the lumen 21 to be viewed from all around. This allows the position and state of the sheath tube 2a to be confirmed when introducing the object 3 from the medical device 2 into the catheter hub 12.

[0027] (Comparison of visibility between Examples and Comparative Examples) Here, with reference to Fig. 6(b), the results of a comparison of visibility between the Example based on the above embodiment and Comparative Examples 1 to 4 will be described. In the comparison in Fig. 6(b), four catheter assemblies of existing products were designated as Comparative Examples 1 to 4, and a comparison study was made of the visibility of the object 3 being introduced into the catheter 11 within the lumen 21 for the catheter assembly 1 of the Example and the catheter assemblies of Comparative Examples 1 to 4. As a result, as shown in Fig. 6(b), the catheter assemblies of Comparative Examples 1 and 2 were evaluated as having poor visibility of the object 3 to be introduced, because the outer peripheral surface near the base end (right end) of the catheter 11 was rough. Furthermore, the catheter assemblies of Comparative Examples 3 and 4 had formations such as wings 26 formed on the outer peripheral surface near the base end of the catheter 11, and these formations were evaluated as having poor visibility of the object 3 to be introduced. In contrast, the catheter assembly 1 of the embodiment has a smooth outer surface of the viewing portion 27 formed adjacent to the base end of the catheter 11, and there are no formations such as wings 26 on the outer surface, so it was evaluated as having good visibility of the introduced object 3.

[0028] Furthermore, with regard to the magnification due to the lens effect, the catheter assemblies of Comparative Examples 1 to 4 had a magnification due to the lens effect of 1.34 or less, whereas the catheter assembly 1 of the Example had a magnification due to the lens effect of 1.53. As such, compared to the catheter assemblies of Comparative Examples, the catheter assembly 1 of the Example made it easier to visualize the object 3 being introduced into the catheter 11.

[0029] (Actions and Effects of the Embodiments) As described above, according to the configuration of the above embodiment, the visualization section 27 is transparent all around and has smooth surfaces on both the inside and outside, allowing the object 3 being introduced into the catheter 11 to be visualized from all around. This allows the object 3 being introduced into the catheter 11 to be visualized without changing the orientation around the axis of the catheter hub 12. In this way, the visibility of the object 3 can be improved, making it easier to visualize the state of the object 3. This makes it possible to easily and accurately check whether the object 3 is clogged and the flow (flow rate) of the object 3. This reduces the difficulty of catheter treatment and shortens the procedure time.

[0030] Furthermore, according to the configuration of the above embodiment, the viewing section 27 has a thickness that allows the lens effect to magnify the introduced object 3 at a predetermined magnification or more (1.4 times or more, 1.45 times or more, or 1.5 times or more), making it easier to view the appearance of the introduced object 3.

[0031] Furthermore, according to the configuration of the above embodiment, the intermediate portion 28 between the equipment connection portion 23 and the viewing portion 27 in the hub main body 22 is formed so as to gradually thicken toward the viewing portion 27 up to the thickness of the viewing portion 27, so that the magnification changes significantly due to the lens effect the moment the object 3 enters the viewing portion 27, preventing the object 3 from being lost.

[0032] Furthermore, since the inner and outer surfaces of the viewing section 27 are formed continuously in the axial direction without any steps, the stepped portions do not get in the way when viewing the introduced object 3, making it easier to view the state of the introduced object 3.

[0033] Furthermore, since the wings 26 are formed so as to be offset in the axial direction relative to the viewing portion 27, the wings 26 do not get in the way of viewing the introduced object 3, making it easier to view the state of the introduced object 3.

[0034] Furthermore, by having the visual confirmation portion 27 have a length of 4 mm or more, the state of the object to be introduced 3 can be more easily visually confirmed.

[0035] (Other embodiments) Although the embodiments of the present invention have been described above, the invention according to the claims is not limited to the above-described embodiments. It should be noted that not all of the combinations of features described in the embodiments are necessarily essential to the means for solving the problems of the invention. The present invention can be implemented by modifying it as appropriate within the scope of its spirit.

[0036] For example, in the above embodiment, both the inner and outer surfaces of the viewing portion 27 are formed in a perfect circle, but this is not limited to this. For example, as shown in Fig. 7, the inner surface of the viewing portion 27 may be a perfect circle, while the outer surface of the viewing portion 27 may be an ellipse, so that the viewing portion 27 has thick portions and thin portions in the circumferential direction that are thinner than the thick portions. In such a case, the magnification due to the lens effect can be changed by changing the orientation around the axis.

[0037] Furthermore, in the above embodiment, the viewing portion 27 is formed in a cylindrical shape and is configured to expand only in the vertical direction due to the lens effect, but the viewing portion 27 may also be formed in a hollow spherical shape and is configured to expand in both the vertical and horizontal directions due to the lens effect.

[0038] In the above embodiment, the visual confirmation portion 27 is transparent all around, but the term "transparent" here is a concept that includes both colorless transparency and colored transparency. That is, the visual confirmation portion 27 may be colorless transparent or colored transparent.

[0039] Furthermore, in the above embodiment, the catheter hub 12 and the visualization section 27 are formed from amorphous polyamide, but the material is not limited to amorphous polyamide as long as it is a transparent resin.

[0040] Furthermore, in the above embodiment, the catheter 11 is adhered to the catheter mounting hole 25, but the present invention is not limited to this. For example, the catheter 11 may be laser welded to the catheter mounting hole 25, or the catheter 11 may be heat welded to the catheter mounting hole 25. Furthermore, for example, the proximal end of the catheter 11 may be attached to the position of the catheter mounting hole 25 by insert molding the catheter hub 12 into the proximal end of the catheter 11.

[0041] Furthermore, in the above embodiment, the strain mounting portion 24 was configured to be formed on the outer peripheral surface of the secondary side (left side) of the hub body 22, but the strain mounting portion 24 may also be configured to be formed on the inner peripheral surface of the secondary side (left side) of the hub body 22.

[0042] Furthermore, in the above embodiment, a configuration in which a vascular embolization substance is introduced by the catheter assembly 1 and the catheter hub 12 is exemplified, but a configuration in which a drug other than a vascular embolization substance is introduced may also be used.

[0043] (Summary of the embodiment) Next, the technical concepts grasped from the above-described embodiments will be described using the reference numerals and the like in the embodiments. However, the reference numerals and the like in the following description do not limit the components in the claims to the members and the like specifically shown in the embodiments.

[0044] <1> A catheter hub (12) for connecting a catheter (11) to a medical device (2), comprising: a hub body (22) having an inner cavity (21); an instrument connection portion (23) formed on the outer peripheral surface of the primary side of the hub body (22) for connecting the medical device (2); a strain attachment portion (24) formed on the secondary side of the hub body (22) for attaching a strain relief (13); and a strain relief (14) formed inside the secondary side of the hub body (22) and attached to the strain attachment portion (24). and a catheter attachment portion (25) for attaching the catheter (11) so as to protrude from the hub (13) to the primary side, wherein the hub body (22) is formed with a viewing portion (27) on the primary side of the catheter (11) attached to the catheter attachment portion (25), the viewing portion (27) being transparent all around and having smooth surfaces on both the inside and outside, and configured to enable the object (3) being introduced into the catheter (11) in the lumen (21) to be viewed from all around. [2] The catheter hub (12) described in [1] is characterized in that the viewing portion (27) is formed in a cylindrical or hollow spherical shape and has a thickness that allows the introduced object (3) to be magnified by a predetermined magnification or more through a lens effect. <3> The catheter hub (12) described in <2>, characterized in that the predetermined magnification or more is 1.4 times or more. <4> The catheter hub (12) described in <2> or <3> is characterized in that the hub body (22) is formed cylindrically, and the intermediate portion (28) between the device connection portion (23) and the viewing portion (27) in the hub body (22) is formed so as to gradually thicken toward the viewing portion (27) up to the thickness of the viewing portion (27). <5> A catheter hub (12) described in any one of <2> to <4>, characterized in that the viewing portion (27) has a thick portion in the circumferential direction and a thin portion that is thinner than the thick portion. <6> A catheter hub (12) described in any one of <1> to <5>, characterized in that the inner and outer surfaces of the viewing portion (27) are formed continuously without any steps in the axial direction. (7) A catheter hub (12) described in any one of (1) to (6), further comprising a wing (26) erected on the outer peripheral surface of the hub body (22), the wing (26) being formed axially offset from the viewing portion (27). <8> A catheter hub (12) described in any one of <1> to <7>, characterized in that the viewing portion (27) has an axial length of 4 mm or more. <9> A catheter hub (12) described in any one of <1> to <8>, characterized in that an intermediate portion (28) between the device connection portion (23) and the viewing portion (27) in the hub body (22) is formed with a sheath tube viewing portion (28) that is transparent all around and has smooth surfaces on both the inside and outside, and is configured to allow the sheath tube (2a) of the medical device (2) inserted into the inner cavity (21) from the primary side to be viewed. <10> A catheter (11), a catheter hub (12) that connects the catheter (11) to a medical device (2), and a strain relief (13) that is attached to the catheter hub (12) and protects the catheter (11). The catheter hub (12) has a hub body (22) having an inner lumen (21), an instrument connection portion (23) that is formed on the outer peripheral surface of the primary side of the hub body (22) and that connects the medical device (2), a strain attachment portion (24) that is formed on the secondary side of the hub body (22) and that attaches the strain relief (13), and a strain attachment portion (24) that is formed on the secondary side of the hub body (22) and that attaches the strain relief (13). and a catheter mounting portion (25) for mounting the catheter (11) so as to protrude from the strain relief (13) attached to the strain mounting portion (24) to the primary side, wherein the hub body (22) is formed with a viewing portion (27) on the primary side of the catheter (11) attached to the catheter mounting portion (25), the viewing portion (27) being transparent all around and having smooth surfaces on both the inside and outside, and configured to enable an object (3) being introduced into the catheter (11) in the lumen (21) to be viewed from all around. [Explanation of symbols]

[0045] 1: Catheter assembly, 2: Medical device, 2a: Sheath tube, 3: Insertion object, 11: Catheter, 12: Catheter hub, 13: Strain relief, 21: Lumen, 22: Hub body, 23: Device connection part, 24: Strain attachment part, 25: Catheter attachment hole part, 26: Wing, 27: Visualization part

Claims

1. 1. A catheter hub for connecting a catheter to a medical device, comprising: a hub body having an internal cavity; an instrument connection portion formed on an outer peripheral surface of the primary side of the hub body, for connecting the medical instrument; a strain attachment portion formed on the secondary side of the hub body and adapted to attach a strain relief; a catheter mounting portion formed inside the secondary side of the hub body and configured to mount the catheter so as to protrude from the strain relief attached to the strain mounting portion to the primary side; a wing provided on the outer peripheral surface of the hub body, The hub body is formed with a transparent viewing section that is transparent over the entire circumference and has smooth inner and outer surfaces over a distance of 4 mm in the axial direction from at least the end face of the primary side of the catheter attached to the catheter attachment section toward the primary side, and that is configured to allow an object being introduced into the catheter in the lumen to be viewed from the entire circumference; The wing is formed to be offset in the axial direction toward the primary side with respect to the viewing portion, A catheter hub characterized in that the visualization portion is formed in a cylindrical or hollow spherical shape and has a thickness that allows the introduced object to be magnified at a magnification of at least a predetermined magnification through a lens effect.

2. A catheter hub as described in claim 1, characterized in that the thickness of the viewing portion is 1.27 mm or more.

3. 3. The catheter hub according to claim 2, wherein the predetermined magnification is 1.4 times or more.

4. The hub body is formed in a cylindrical shape, 3. The catheter hub according to claim 2, wherein an intermediate portion of the hub body between the device connection portion and the viewing portion is formed so as to gradually thicken toward the viewing portion up to the thickness of the viewing portion.

5. The catheter hub according to claim 2, wherein the visual confirmation portion has a thick portion and a thin portion that is thinner than the thick portion in the circumferential direction.

6. 3. The catheter hub according to claim 1, wherein the inner and outer surfaces of the visualization portion are formed continuously without any steps in the axial direction.

7. A catheter hub as described in claim 1 or 2, characterized in that a sheath tube viewing section is formed in the intermediate section of the hub body between the device connection section and the viewing section, which is transparent around the entire circumference and has smooth surfaces on both the inner and outer sides, and is configured to allow the sheath tube of the medical device inserted into the inner cavity from the primary side to be viewed.

8. A catheter, A catheter hub according to any one of claims 1 to 7; a strain relief attached to the strain attachment portion.

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