A catheter seat assembly and a long-term dialysis catheter

Abstract

This utility model discloses a catheter seat assembly and a long-term dialysis catheter. The catheter seat assembly includes a catheter seat, a supporting inner tube, a locking outer tube, and a fixing ring. The catheter seat has a first end and a second end, which are detachably connected to an extension tube and a dialysis main tube, respectively. The supporting inner tube supports the proximal inner wall of the dialysis main tube and is placed inside the second end of the catheter seat. The locking outer tube is sleeved outside the supporting inner tube and wraps around the proximal end of the dialysis main tube, and is connected to the second end of the catheter seat. The fixing ring is sleeved outside the locking outer tube and locks the locking outer tube radially along the dialysis main tube to the proximal end of the dialysis main tube. In this utility model, the catheter seat assembly, through optimized structural design, is detachably connected to the dialysis main tube. When the catheter seat becomes blocked, it can be separated from the dialysis main tube by disassembling the catheter seat assembly, requiring only the replacement of the catheter seat assembly.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a catheter seat assembly and a long-term dialysis catheter. Background Technology

[0002] Dialysis catheters play a crucial role in the treatment of chronic renal failure. However, with prolonged use and frequent dialysis procedures, the catheter seat can become blocked, leading to a loss of overall catheter function. When this occurs, the usual solution is to replace the entire catheter, which not only increases treatment costs for the patient but also carries certain surgical risks.

[0003] To address the issue of needing to replace the entire dialysis catheter due to catheter seat blockage, existing technologies have included designs that only require replacing the catheter seat, such as the nephrology dialysis catheter disclosed in patent document CN218685483U. This patent discloses a disassembly assembly between the catheter and the catheter seat. When the catheter seat becomes blocked, the assembly allows for removal of the seat from the catheter and replacement with a new seat. The disassembly assembly mainly includes a connector mounted on the catheter, an adjusting spring mounted on the connector, an adjusting block connected to the adjusting spring, and a fixing recess for connecting the adjusting block. The adjusting spring enables a detachable connection between the adjusting block and the fixing recess, thus allowing for a detachable connection between the catheter and the catheter seat, facilitating catheter seat replacement. While this solution achieves detachable installation and connection between the catheter seat and the catheter, the connection between the adjusting block and the fixing recess is not tight enough. The adjusting block easily detaches from the fixing recess, and the sealing effect between the connector and the fixing recess is poor, affecting the service life of the dialysis catheter.

[0004] To address the issue of needing to replace the entire dialysis catheter due to catheter seat blockage, there is an urgent need for a new structure that allows for the detachable connection and installation of the dialysis catheter's extension tube and main dialysis tube. This structure would enable quick and easy replacement of the easily blocked catheter seat, with a reliable connection between the extension tube and the main dialysis tube. Installation and disassembly would be simple, with a good seal, extending the lifespan of the dialysis catheter, reducing treatment costs and risks for patients with chronic renal failure, and improving their quality of life. Utility Model Content

[0005] In order to overcome at least one of the defects of the prior art, one of the objectives of this utility model is to provide a catheter seat assembly. The catheter seat assembly is detachably connected to the dialysis tube through an optimized structural design. When the catheter seat becomes blocked, the catheter seat assembly can be separated from the dialysis tube by disassembling it, so that only the catheter seat part needs to be replaced when the catheter seat is blocked.

[0006] In order to overcome at least one of the defects of the prior art, the second objective of this utility model is to provide a long-term dialysis catheter. The long-term dialysis catheter uses the aforementioned catheter seat assembly. The catheter seat assembly and the dialysis main tube can be quickly and easily disassembled. The aim is to replace only the catheter seat part when the catheter seat is blocked, without having to replace the entire dialysis catheter, thus avoiding surgical problems for the patient.

[0007] The technical solution adopted by this utility model to solve its problem is:

[0008] A catheter hub assembly connecting a dialysis main tube and an extension tube includes a catheter hub, a supporting inner tube, a locking outer tube, and a retaining ring. The catheter hub has a first end and a second end, which are detachably connected to the extension tube and the dialysis main tube, respectively. The extension tube includes a fixed end and a free end, and the dialysis main tube includes a proximal end and a distal end for puncture. The first end is connected to the fixed end of the extension tube, and the second end is connected to the proximal end of the dialysis main tube.

[0009] The inner support tube is placed inside the dialysis tube and is used to support the proximal inner wall of the dialysis tube. The outer diameter of the inner support tube is adapted to the proximal inner diameter of the dialysis tube. The inner support tube has an outer end and an inner end. The inner end is placed inside the dialysis tube, and the outer end is placed outside the dialysis tube and inside the second end of the catheter seat.

[0010] The locking outer tube is sleeved outside the supporting inner tube and wraps around the proximal end of the dialysis tube. The locking outer tube has an end one and an end two. The end two is fixedly connected to the second end of the catheter seat. The end two is sleeved outside the proximal end of the dialysis tube.

[0011] The retaining ring is sleeved on the outside of the locking outer tube and locks the locking outer tube to the proximal end of the dialysis tube along the radial direction of the dialysis tube.

[0012] In a preferred embodiment, an interlayer space is formed between the inner wall of the locking outer tube and the outer wall of the supporting inner tube, the cross-section of the interlayer space being adapted to the cross-section of the proximal end of the dialysis tube, and the proximal end of the dialysis tube being placed within the interlayer space.

[0013] In a preferred embodiment, the outer contour of the supporting inner tube is adapted to the inner contour of the proximal end of the dialysis tube, and the inner end of the supporting inner tube is inserted into and fixed within the proximal end of the dialysis tube.

[0014] In a preferred embodiment, a protrusion is provided on the outer wall of the supporting inner tube, and the protrusion faces the inner wall of the locking outer tube.

[0015] In a preferred embodiment, a clearance groove is provided on the inner wall of the locking outer tube, and the clearance groove faces the protrusion.

[0016] In a preferred embodiment, the inner diameter of the second end of the catheter seat is smaller than the inner diameter of the locking outer tube. The second end of the locking outer tube is fixedly connected to the end face of the second end. A first limiting shoulder is formed between the inner wall of the locking outer tube and the end face of the second end. The proximal end face of the dialysis tube abuts against the first limiting shoulder. The locking outer tube and the catheter seat are integrally formed.

[0017] In a preferred embodiment, a limiting groove is provided on the outer wall of the locking outer tube, and the fixing ring is sleeved on the limiting groove.

[0018] In a preferred embodiment, the outer end of the supporting inner tube is placed inside the second end of the conduit seat, and the outer wall of the supporting inner end is in sealed contact with the inner wall of the second end.

[0019] In a preferred embodiment, a second limiting shoulder is provided on the inner wall of the second end of the conduit seat, and the end face of the outer end of the supporting inner tube abuts against the second limiting shoulder and is in sealing contact with the second limiting shoulder.

[0020] A long-term dialysis catheter includes an extension tube, a dialysis main tube, and the aforementioned catheter seat assembly.

[0021] In summary, the catheter seat assembly provided by this utility model has the following technical effects:

[0022] 1. Through the structural design and optimization of the catheter hub assembly, the catheter hub and the proximal end of the dialysis tube can be detachably connected, enabling quick installation and removal of the catheter hub on the dialysis tube. Provided that the dialysis tube is usable, and only when the catheter hub is blocked, the catheter hub can be directly removed and replaced.

[0023] 2. By setting up a support inner tube, which is built into the body and combined with the locking outer tube externally, the effective connection between the catheter hub and the dialysis main tube is ensured, and the connection between the catheter hub and the dialysis main tube is ensured to be reliable.

[0024] In summary, the long-term dialysis catheter provided by this utility model has the following technical effects: the long-term dialysis catheter is used in conjunction with the aforementioned catheter seat assembly, so that the dialysis catheter and the catheter seat can be detachably connected. Under the premise that the dialysis main tube is available, only when the catheter seat is blocked, the catheter seat can be directly removed and only the catheter seat needs to be replaced. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of one embodiment of a catheter seat assembly according to the present invention.

[0026] Figure 2 This is a schematic diagram of one embodiment of a long-term dialysis catheter according to the present invention.

[0027] Figure 3 for Figure 2 Enlarged image of the source of Chinese A.

[0028] Figure 4 Diagram showing the state of the catheter hub assembly and dialysis tube before installation.

[0029] The meanings of the reference numerals in the attached figures are as follows:

[0030] 100. Catheter hub assembly; 200. Extension tube; 201. Fixed end; 202. Free end; 300. Dialysis main tube; 301. Proximal end; 302. Distal end; 203. Interstitial space;

[0031] 1. Catheter hub; 11. First end; 12. Second end; 13. Second limiting shoulder;

[0032] 2. Supporting inner tube; 21. Inner end; 22. Outer end; 23. Protrusion;

[0033] 3. Locking outer tube; 31. End 1; 32. End 2; 33. Clearance groove; 34. First limiting shoulder; 35. Limiting groove; 4. Fixing ring. Detailed Implementation

[0034] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0035] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0037] See Figures 1-4The diagram shows a schematic representation of an embodiment of a long-term dialysis catheter according to the present invention.

[0038] A long-term dialysis catheter includes an extended tube 200, a dialysis main tube 300, and a catheter seat assembly 100. The extended tube 200 has a fixed end 201 and a free end 202. The free end 202 is generally connected to a catheter connector, and the fixed end 201 is connected to the catheter seat assembly 100. The dialysis main tube 300 has a proximal end 301 and a distal end 302. The distal end 302 is generally used for puncture, and the proximal end 301 is connected to the catheter seat 100. That is, the connection ends of the extended tube 200 and the dialysis main tube 300 to the catheter seat assembly 100 are the fixed end 201 and the proximal end 301, respectively. The extended tube 200 and the dialysis main tube 300 are detachably and fixedly connected as a whole by the catheter seat assembly 100 with the catheter seat 1, and the extended tube 200 and the dialysis main tube 300 are connected to form a puncture dialysis catheter with puncture function. To achieve detachable connection between the proximal end 301 of the dialysis tube 300 and the catheter hub assembly 100, the structure of the catheter hub assembly 100 is crucial. The catheter hub assembly 100 will be described in detail below.

[0039] See Figure 1 As shown, this utility model discloses a schematic diagram of an embodiment of a catheter seat assembly 100 in the technical solution of this utility model.

[0040] See Figure 2 As shown, a catheter seat assembly 100 is used in conjunction with a dialysis tubing to connect a main dialysis tube 300 and an extension tube 200.

[0041] The catheter hub assembly 100 includes a catheter hub 1, a supporting inner tube 2, a retaining ring 4, and a locking outer tube 3. The catheter hub 1 has a first end 11 and a second end 12, and the first end 11 and the second end 12 of the catheter hub 1 are detachably connected to the extension tube 200 and the dialysis main tube 300, respectively.

[0042] Reference Figure 2 In the process, the epitaxial tube 200 includes a fixed end 201 and a free end 202, and the dialysis main tube 300 includes a proximal end 301 and a distal end 302 for puncture. The first end 11 is connected to the fixed end 201 of the epitaxial tube 200, and the second end 12 is connected to the proximal end 301 of the dialysis main tube 300.

[0043] Reference Figure 2In this assembly, the inner support tube 2 is placed inside the dialysis main tube 300 and serves to support the inner wall of the proximal end 301 of the dialysis main tube 300. The outer diameter of the inner support tube 2 is adapted to the inner diameter of the proximal end 301 of the dialysis main tube 300, and the inner support tube 2 has an outer end 22 and an inner end 21. The inner end 21 is placed inside the dialysis main tube 300, and the outer end 22 is placed outside the dialysis main tube 300 and inside the second end 12 of the catheter seat 1. When the catheter seat assembly 100 is connected to the proximal end 301 of the dialysis main tube 300, the inner support tube 2 is placed inside the proximal end 301 of the dialysis main tube 300. This serves two purposes: firstly, it supports the proximal end 301 of the dialysis main tube 300 to prevent deformation of the proximal end 301 of the dialysis main tube 300; secondly, it enables communication between the proximal end 301 of the dialysis main tube 300 and the catheter seat 1.

[0044] The supporting inner tube 2 should possess a certain degree of toughness and be resistant to deformation. It serves to support the proximal end 301 of the dialysis main tube 300, preventing deformation during connection and ensuring proper conductivity. This ensures the effective cross-sectional area through which the liquid passes through the proximal end 301 of the dialysis main tube 300. In other words, the supporting inner tube 2 prevents deformation of the proximal end 301 of the dialysis main tube 300, extends its service life, reduces the frequency of replacement, lowers dialysis costs and expenses, reduces the number of procedures, and ultimately reduces treatment costs and risks.

[0045] Reference Figure 3 In this configuration, the locking outer tube 3 is fitted over the supporting inner tube 2 and wraps around the proximal end 301 of the dialysis main tube 300. The locking outer tube 3 has an end 31 and an end 32, with the end 32 connected to the second end 12 of the catheter seat 1. The end 31 is fitted over the proximal end 301 of the dialysis main tube 300. When the catheter seat assembly 100 is connected to the proximal end 301 of the dialysis main tube 300, the locking outer tube 3 wraps around the proximal end 301 of the dialysis main tube 300.

[0046] The retaining ring 4 is sleeved on the outside of the locking outer tube 3 and locks the locking outer tube 3 radially along the dialysis main tube 300 onto the proximal end 301 of the dialysis main tube 300. The retaining ring 4 is mainly used to fix the catheter seat assembly 100 to the proximal end 301 of the dialysis main tube 300, and to detachably fix the proximal end 301 of the dialysis main tube 300 to the catheter seat assembly 100.

[0047] Because the inner and outer diameters of the dialysis main tube 300 are both small, it is essential to install a supporting inner tube 2 on the inner wall of the proximal end 301 of the dialysis main tube 300 to ensure a reliable connection between the dialysis main tube 300 and the extension tube 200, or in other words, to achieve a reliable connection between the dialysis main tube 300 and the catheter seat assembly 100, while preventing the inner diameter of the dialysis main tube 300 from being significantly reduced due to the locking of the outer tube 3 when connected to the catheter seat assembly 100. By using the embedded connection of the supporting inner tube 2 and the locking outer tube 3 to achieve a detachable and fixed connection of the proximal end 301 of the dialysis main tube 300, both the fixed installation of the proximal end 301 of the dialysis main tube 300 and the reliable connection between the extension tube 200 and the dialysis main tube 300 are achieved.

[0048] The locking outer tube 3 is wrapped around the proximal end 301 of the dialysis main tube 300. This not only locks and fixes the proximal end 301 of the dialysis main tube 300, but also protects the proximal end 301 of the dialysis main tube 300 from connection damage, such as breakage, cracking or contamination.

[0049] The dialysis main tube 300 can be a commonly used dialysis catheter in the medical field, or it can be a dialysis catheter specified or customized for a specific disease. Commonly used types include single-lumen, double-lumen, and triple-lumen dialysis catheters, with double-lumen catheters being the most common. The following is a brief introduction to the connection between the double-lumen dialysis catheter and the catheter hub assembly 100, using the double-lumen dialysis catheter as an example. The double-lumen dialysis catheter has two relatively fixed and independently fluid-conducting tubing bodies, specifically two independent tubings at the proximal end 301. Each of these tubings should contain a supporting inner tube 2. The inner walls of the two tubings contact the outer walls of the supporting inner tube 2. The locking outer tube 3 wraps around the outside of the double-lumen dialysis catheter, with the outer wall of the double-lumen dialysis catheter contacting the inner wall of the locking outer tube 3. The outer contour of the cross-section of a typical double-lumen dialysis catheter is circular, and the outer contour of the cross-section of a typical dialysis main tube 300 is also circular; therefore, the inner contour of the cross-section of the locking outer tube 3 is also circular. When the outer contour of the cross-section of the dialysis main tube 300 is circular, the outer contour of the cross-section of the inner tube 2 is semi-circular to facilitate the installation of the inner tube 2 and to support the dialysis main tube 300. Of course, in some embodiments, the outer contour of the cross-section of the inner tube 2 can be other desired shapes.

[0050] Based on the above-mentioned catheter seat assembly 100 connecting and communicating the dialysis main tube 300 and the extension tube 200, the catheter seat 1 achieves the connection of the dialysis main tube 300 and the extension tube 200 in two ways, or in other words, the catheter seat assembly 100 has two embodiments. One embodiment is to assemble the supporting inner tube 2 with the catheter seat 1, that is, the supporting inner tube 2 and the catheter seat 1 are first fixedly connected, and then the dialysis main tube 300 and the extension tube 200 are respectively assembled with the catheter seat assembly 100, and finally the retaining ring 4 is assembled. The other embodiment is to assemble the supporting inner tube 2 with the dialysis main tube 300, that is, the supporting inner tube 2 and the dialysis main tube 300 are fixedly connected, and then the structure of the supporting inner tube 2 and the dialysis main tube 300 is assembled with the catheter seat 1 and the locking outer tube 3. The two embodiments of the catheter seat assembly 100 will be described in detail below.

[0051] Example 1

[0052] See Figure 3 A space 203 is formed between the inner wall of the locking outer tube 3 and the outer wall of the supporting inner tube 2. The cross-section of the space 203 is adapted to the cross-section of the proximal end 301 of the dialysis main tube 300, and the proximal end 301 of the dialysis main tube 300 is placed within the space 203. In this embodiment, the supporting inner tube 2 is first assembled with the catheter seat 1 to obtain an integral component. This integral component is part of the structure of the catheter seat assembly 100. Then, the dialysis main tube 300 and the extension tube 200 are respectively connected to this integral component.

[0053] In this embodiment, the interlayer space 203 is adapted to the proximal end 301 of the dialysis tube 300 and is used to accommodate the proximal end 301 of the dialysis tube 300. The outer contour of the inner support tube 2 is adapted to the inner contour of the proximal end 301 of the dialysis tube 300, and the inner end 21 of the inner support tube 2 is inserted into and fixed within the proximal end 301 of the dialysis tube 300.

[0054] When the catheter hub assembly 100 is connected to the proximal end 301 of the dialysis tube 300, the proximal end 301 of the dialysis tube 300 is placed within the interlayer space 203, and the locking outer tube 3 is used to lock the proximal end 301 of the dialysis tube 300 inward, thereby fixing the proximal end 301 of the dialysis tube 300 to the locking outer tube 3. The interlayer space 203 is provided to accommodate and connect the proximal end 301 of the dialysis tube 300.

[0055] The cross-section of the interlayer space 203 is adapted to the cross-section of the proximal end 301 of the dialysis tube 300, and the proximal end 301 of the dialysis tube 300 is placed within the interlayer space 203. The inner contour of the cross-section of the interlayer space 203 is formed by the side of the outer wall of the supporting inner tube 2 directly facing the inner wall of the locking outer tube 3, ensuring that the locking outer tube 3 uniformly locks the dialysis tube 300, avoiding local deformation or voids in the dialysis tube 300, and ensuring a reliable connection between the dialysis tube 300 and the extension tube 200 through the catheter seat assembly 100. In this embodiment, when the extension tube 200 needs to be disassembled, the entire assembly of the catheter seat 1, the locking outer tube 3, and the supporting inner tube 2 is pulled off the dialysis tube 300, while the supporting inner tube 2 remains inside the second end 12 of the catheter seat 1. When the extension tube 200 needs to be replaced, the extension tube 200, the catheter seat 1, the supporting inner tube 2, and the locking outer tube 3 are pulled off the dialysis tube 300 together.

[0056] Example 2

[0057] See Figure 3 The outer contour of the supporting inner tube 2 is adapted to the inner contour of the proximal end 301 of the dialysis main tube 300. The inner end 21 of the supporting inner tube 2 is inserted into and fixed within the proximal end 301 of the dialysis main tube 300. In this second embodiment, the supporting inner tube 2 is fixedly connected to the proximal end 301 of the dialysis main tube 300 to form an integral component. This integral component is then connected to the locking outer tube 3 in the catheter seat assembly 100, and the dialysis main tube 300 is fixedly connected to the catheter seat assembly 100 through the locking outer tube 3. In this embodiment, when the extension tube 200 needs to be disassembled, the catheter seat 1 and the locking outer tube 3 are pulled off the dialysis main tube 300 as a whole, while the supporting inner tube 2 remains within the proximal end 301 of the dialysis main tube 300.

[0058] In some embodiments, to further ensure the connection and locking of the inner support tube 2 and the outer locking tube 3 to the proximal end 301 of the dialysis tube 300, a protrusion 23 is provided on the outer wall of the inner support tube 2, with the protrusion 23 facing the inner wall of the outer locking tube 3. The proximal end 301 of the dialysis tube 300 is a flexible tube. When the proximal end 301 of the dialysis tube 300 is connected to the catheter seat assembly 100, as the inner end 21 of the inner support tube 2 moves inward relative to the proximal end 301 of the dialysis tube 300, the proximal end 301 of the dialysis tube 300 undergoes partial deformation when passing the protrusion 23. The protrusion 23 presses the proximal end 301 of the dialysis tube 300 against the inner wall of the outer locking tube 3. Then, the fixing ring 4 outside the outer locking tube 3 is fitted onto the outer locking tube 3, reducing the distance between the protrusion 23 and the inner wall of the outer locking tube 3, further locking the proximal end 301 of the dialysis tube 300. In addition, the protrusion 23 reduces the distance between the outer wall of the supporting inner tube 2 and the inner wall of the locking outer tube 3, so that the proximal end 301 of the dialysis tube 300 and the catheter assembly are initially fixed, which facilitates the subsequent operation of putting on the fixing ring 4.

[0059] To facilitate the connection between the proximal end 301 of the dialysis tube 300 and the catheter assembly, and to prevent the protrusion 23 on the outer wall of the supporting inner tube 2 from interfering with or obstructing the connection, a clearance groove 33 is provided on the inner wall of the locking outer tube 3, facing the protrusion 23. When the proximal end 301 of the dialysis tube 300 is connected to the catheter seat assembly 100, upon encountering the protrusion 23, the proximal end 301 of the dialysis tube 300 will crawl along the protrusion 23 and continue moving towards the second end 12 of the catheter seat 1 from the clearance groove 33 position until it abuts against the end face of the second end 12 of the catheter seat 1. Simultaneously, the clearance groove 33 provides sufficient space for the protrusion 23, allowing for a suitable increase in the height of the protrusion 23 and ensuring its proper function.

[0060] The inner diameter of the second end 12 of the catheter hub 1 is smaller than the inner diameter of the locking outer tube 3. The end 32 of the locking outer tube 3 is fixedly connected to the end face of the second end 12. A first limiting shoulder 34 is formed between the inner wall of the locking outer tube 3 and the end face of the second end 12. The end face of the proximal end 301 of the dialysis tube 300 abuts against the first limiting shoulder 34. The first limiting shoulder 34 positions and limits the connection of the proximal end 301 of the dialysis tube 300 to the catheter hub assembly 100.

[0061] To facilitate and simplify the processing of the locking outer tube 3 and the connection between the locking outer tube 3 and the guide tube seat 1, the locking outer tube 3 and the guide tube seat 1 are integrally formed. Both the guide tube seat 1 and the locking outer tube 3 are plastic parts and can be injection molded.

[0062] To facilitate the fixation of the retaining ring 4 on the locking outer tube 3 and ensure that the retaining ring 4 can be detachably installed on the proximal end 301 of the dialysis main tube 300 via the locking outer tube 3, a limiting groove 35 is provided on the outer wall of the locking outer tube 3, and the retaining ring 4 is sleeved on the limiting groove 35. The limiting groove 35 is adapted to the retaining ring 4, so that when the proximal end 301 of the dialysis main tube 300 is locked, the retaining ring 4 can remain stably within the limiting groove 35.

[0063] The outer end 22 of the dialysis main tube 300 abuts against the end face of the second end 12 of the catheter seat 1. The retaining ring 4 is fitted onto the locking outer tube 3 and enters the limiting groove 35. The retaining ring 4, along the radial direction, presses the proximal end 301 of the dialysis main tube 300 against the inner wall of the supporting inner tube 2 through the locking outer tube 3. The extension tube 200 and the dialysis main tube 300 are detachably connected and communicate with each other through the catheter seat 1.

[0064] To facilitate the connection between the inner support tube 2 and the catheter seat 1, the outer end 22 of the inner support tube 2 is placed inside the second end 12 of the catheter seat 1, and is in sealed contact with the outer wall of the inner support tube 2 and the inner wall of the second end 12. The inner support tube 2 is made of highly corrosion-resistant metal material and is detachably fixed to the catheter seat 1, which facilitates the processing of the inner support tube 2. A second limiting shoulder 13 is provided on the inner wall of the second end 12 of the catheter seat 1, and the end face of the outer end 22 of the inner support tube 2 abuts against the second limiting shoulder 13. The setting of the second limiting shoulder 13 enables the positioning of the inner support tube 2 on the catheter seat 1, avoiding the inner support tube 2 being too long inside the catheter seat 1, which would affect the support of the dialysis main tube 300, and also avoiding the inner support tube 2 being too short inside the catheter seat 1, which would affect the stable installation of the inner support tube 2.

[0065] Of course, the inner support tube 2 can also be integrally molded with the catheter seat 1. When the catheter seat 1 is injection molded, the inner support tube 2 is injection molded onto the catheter seat 1, making the connection more reliable.

[0066] The catheter hub assembly 100 proposed in this solution has a simple structure, can be manufactured, processed and sold separately, and can be detachably connected to multiple models of dialysis main tubes 300. It has good adaptability and strong compatibility.

[0067] This utility model provides a catheter seat assembly 100. Through the arrangement of a catheter seat 1, a supporting inner tube 2, a locking outer tube 3, and a fixing ring 4, the catheter seat assembly 100 is detachably connected to the proximal end 301 of the dialysis main tube 300. This allows for quick installation and removal of the catheter seat assembly 100 from the dialysis main tube 300. When the dialysis main tube 300 is usable, and only the catheter seat 1 is blocked, the catheter seat assembly 100 can be directly removed and replaced. The aim is to replace only a portion of the catheter seat assembly 100 when the catheter seat 1 is blocked, without requiring surgery to replace the entire dialysis catheter, thus avoiding surgical complications for patients, reducing treatment costs and risks for patients with chronic renal failure, and improving their quality of life.

[0068] A long-term dialysis catheter is mainly assembled from a catheter seat assembly 100, a retaining ring 4, a dialysis main tube 300, and an extension tube 200. During assembly, there are two assembly methods depending on the different structures of the catheter seat assembly 100 in Embodiments 1 and 2.

[0069] Assembly Method 1

[0070] The first step is to assemble the inner support tube 2, the outer locking tube 3, and the catheter seat 1 to obtain a single integral component; the second step is to assemble the extension tube 200 with the catheter seat 1; the third step is to put the fixing ring 4 on the dialysis main tube 300; the fourth step is to connect the assembled integral component to the proximal end 301 of the dialysis main tube 300; the fifth step is to put the fixing ring 4 on the locking outer tube 3 to complete the assembly.

[0071] When catheter seat 1 becomes blocked, catheter seat assembly 100 is replaced. The procedure is generally as follows: first, the retaining ring 4 is disengaged from the locking outer tube 3 and placed on the dialysis main tube 300. Then, the catheter seat assembly 100 and the extension tube 200 are pulled out from the dialysis main tube 300. Finally, the new catheter seat assembly 100 and the extension tube 200 are installed according to the aforementioned assembly process.

[0072] Assembly Method Two

[0073] First, insert the inner end 21 of the inner support tube 2 into the dialysis tube 300 through the proximal end 301 of the dialysis tube 300 to obtain a single integral component; second, fit the retaining ring 4 onto the outside of the dialysis tube 300; third, connect the obtained integral component to the catheter seat 1; fourth, fit the retaining ring 4 into the locking outer tube 3; fifth, connect the extension tube 200 to the second end 12 of the catheter seat 1.

[0074] When catheter seat 1 becomes blocked, catheter seat assembly 100 is replaced. The procedure is generally as follows: first, the retaining ring 4 is disengaged from the locking outer tube 3 and placed on the dialysis main tube 300. Then, the dialysis main tube 300 is removed from the catheter seat 1, while the supporting inner tube 2 remains on the dialysis main tube 300. The outer extension tube 200 is replaced, and then the long-term dialysis catheter is reassembled according to the assembly method two described above.

[0075] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A catheter hub assembly connecting a dialysis main tube (300) and an extension tube (200), characterized in that: The device includes a catheter seat (1), a supporting inner tube (2), a locking outer tube (3), and a fixing ring (4). The catheter seat (1) has a first end (11) and a second end (12). The first end (11) and the second end (12) are detachably connected to an extension tube (200) and a dialysis main tube (300), respectively. The extension tube (200) includes a fixed end (201) and a free end (202). The dialysis main tube (300) includes a proximal end (301) and a distal end (302) for puncture. The first end (11) is connected to the fixed end (201) of the extension tube (200), and the second end (12) is connected to the proximal end (301) of the dialysis main tube (300). The inner support tube (2) is placed inside the dialysis tube (300) and is used to support the inner wall of the proximal end (301) of the dialysis tube (300). The outer diameter of the inner support tube (2) is adapted to the inner diameter of the proximal end (301) of the dialysis tube (300). The inner support tube (2) has an outer end (22) and an inner end (21). The inner end (21) is placed inside the dialysis tube (300), and the outer end (22) is placed outside the dialysis tube (300) and inside the second end (12) of the catheter seat (1). The locking outer tube (3) is sleeved outside the supporting inner tube (2) and wraps around the proximal end (301) of the dialysis tube (300). The locking outer tube (3) has an end one (31) and an end two (32). The end two (32) is fixedly connected to the second end (12) of the catheter seat (1). The end one (31) is sleeved outside the proximal end (301) of the dialysis tube (300). The fixing ring (4) is sleeved on the outside of the locking outer tube (3) and locks the locking outer tube (3) on the proximal end (301) of the dialysis tube (300) radially along the dialysis tube (300).

2. The catheter seat assembly according to claim 1, characterized in that, An interlayer space (203) is formed between the inner wall of the locking outer tube (3) and the outer wall of the supporting inner tube (2). The cross-section of the interlayer space (203) is adapted to the cross-section of the proximal end (301) of the dialysis tube (300), and the proximal end (301) of the dialysis tube (300) is placed in the interlayer space (203).

3. The catheter seat assembly according to claim 1, characterized in that, The outer contour of the inner support tube (2) is adapted to the inner contour of the proximal end (301) of the dialysis tube (300), and the inner end (21) of the inner support tube (2) is inserted into the proximal end (301) of the dialysis tube (300) and fixed.

4. The catheter seat assembly according to claim 1, 2, or 3, characterized in that, The outer wall of the supporting inner tube (2) is provided with a protrusion (23), which faces the inner wall of the locking outer tube (3).

5. The catheter seat assembly according to claim 4, characterized in that, The inner wall of the locking outer tube (3) is provided with a relief groove (33), which faces the protrusion (23).

6. The catheter seat assembly according to claim 1, 2, or 3, characterized in that, The inner diameter of the second end (12) of the catheter seat (1) is smaller than the inner diameter of the locking outer tube (3). The end (32) of the locking outer tube (3) is fixed to the end face of the second end (12). A first limiting shoulder (34) is formed between the inner wall of the locking outer tube (3) and the end face of the second end (12). The end face of the proximal end (301) of the dialysis tube (300) abuts against the first limiting shoulder (34). The locking outer tube (3) and the catheter seat (1) are integrally formed.

7. The catheter seat assembly according to claim 1, 2, or 3, characterized in that, The locking outer tube (3) has a limiting groove (35) on its outer wall, and the fixing ring (4) is sleeved on the limiting groove (35).

8. The catheter seat assembly according to claim 1, characterized in that, The outer end (22) of the inner support tube (2) is placed inside the second end (12) of the conduit seat (1), and the outer wall of the inner support tube (2) is in sealed contact with the inner wall of the second end (12).

9. The catheter seat assembly according to claim 8, characterized in that, A second limiting shoulder (13) is provided on the inner wall of the second end (12) of the conduit seat (1), and the end face of the outer end (22) of the supporting inner tube (2) abuts against the second limiting shoulder (13) and is in sealed contact with the second limiting shoulder.

10. A long-term dialysis catheter, characterized in that: It includes an extension tube (200), a dialysis main tube (300), and a catheter hub assembly (100) as described in any one of claims 1 to 9.

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