conduit

Abstract

The utility model relates to a catheter, including inner tube, catheter seat and connecting piece, the first passageway is equipped with along its axial direction in catheter seat, the connecting piece is set on the proximal end part of inner tube and is opposite fixed with inner tube and forms a section inner connecting section, the roughness of the outer surface of opposite fixed connecting piece is greater than the roughness of inner tube outer surface, and inner connecting section stretches into the first passageway and is opposite fixed with catheter seat, and the end of inner tube away from connecting piece stretches out from the distal end side of catheter seat. The utility model discloses the roughness of the outer surface of the inner connecting section that is formed after fixed treatment is greater than the roughness of inner tube surface, when connecting inner tube and catheter seat, the bonding site becomes the inner connecting section of relatively rough surface from the smooth inner tube in prior art, and the bonding force is strengthened, and the connecting strength with catheter seat is strengthened, prevents the leakage of catheter later period. And because of the setting of connecting piece, the support of inner tube is increased, prevents the inner tube from not being centered after UV solidification glue solidification, and affects the wire passing property.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a catheter. Background Technology

[0002] The scoring balloon is a special type of balloon that combines micro-scribing technology with balloon dilation. It combines the scoring element with the dilation mechanism of a regular balloon, allowing the scoring element to dilate sufficiently at lower pressure and cut open the lesion area. It causes less irregular tearing of the vascular intima, thus minimizing vascular damage. It can reduce the proliferation of reactive smooth muscle cells and lower the restenosis rate, thereby gaining widespread use in vascular surgery.

[0003] However, in order to ensure the product's passability and flexibility, the inner tube of the currently marketed scoring balloons is usually made of a thin-walled tube with a smooth outer surface. This can lead to insufficient connection strength between the inner tube and the catheter seat, which can easily cause leakage over time. At the same time, because the inner tube material is relatively soft, the UV curing adhesive can squeeze the inner tube during the curing process, causing the inner tube to become misaligned, which affects the passage of the guidewire of the subsequent balloon catheter. Summary of the Invention

[0004] The purpose of this invention is to provide a catheter that at least solves the leakage problem caused by insufficient connection strength between the inner tube and the catheter seat in existing catheters.

[0005] This utility model provides a catheter, including an inner tube, a catheter seat, and a connector. The catheter seat has a first channel along its axial direction. The connector is sleeved on the proximal end of the inner tube and fixed relative to the inner tube to form an inner connecting section. The roughness of the outer surface of the connector fixed relative to the inner tube is greater than the roughness of the outer surface of the inner tube. The inner connecting section extends into the first channel and is fixed relative to the catheter seat. The end of the inner tube away from the connector extends from the distal end of the catheter seat.

[0006] In one embodiment, a first gap is provided between the outer surface of the inner connecting segment and the inner wall of the first channel, and a first connecting layer is provided within the first gap, through which the inner connecting segment is fixed relative to the conduit seat.

[0007] In one embodiment, the conduit seat is provided with a first injection hole that communicates with the first channel, and the first bonding layer is formed by injecting adhesive into the first interval through the first injection hole.

[0008] In one embodiment, the radial spacing of the first interval is between 0.02 mm and 0.1 mm.

[0009] In one embodiment, an outer tube is also included, the outer tube comprising a tube body layer and a braided layer fixed within the tube body layer, the outer tube being spaced out over the inner tube and its proximal end being fixed relative to the catheter seat.

[0010] In one embodiment, the system further includes a balloon, the distal end of the inner tube extending from the distal end of the outer tube, the balloon being fitted over the inner tube and the proximal end of the balloon being fixedly connected to the distal end of the outer tube, and the distal end of the balloon being fixedly connected to the distal end of the inner tube.

[0011] In one embodiment, the device further includes a restraint stent fitted onto the balloon. The proximal end of the restraint stent is fixed to the distal end of the outer tube, and the distal end of the restraint stent is fixed to the distal end of the inner tube. The restraint stent is constricted in its natural state and can expand as the balloon expands.

[0012] In one embodiment, the restraint stent includes a stent body and connecting portions located at both ends of the stent body. Each connecting portion includes a connecting rod connected to the stent body and a connecting foot connected to the connecting rod. The connecting foot is plate-shaped, and the radial cross-section of the connecting foot is an arc shape that convexes outward relative to the central axis of the stent body. At least the proximal connecting foot of the restraint stent and the proximal tube foot of the balloon are attached to the outer peripheral side of the distal end of the outer tube and are thermally fused to the distal end of the outer tube, such that the proximal connecting foot is at least partially embedded in the tube body layer of the outer tube.

[0013] In one embodiment, the first channel includes a first sub-channel with a first inner diameter, a second sub-channel with a second inner diameter, and a third sub-channel with a third inner diameter. The first sub-channel, the second sub-channel, and the third sub-channel are coaxially arranged and connected from far to near. The second inner diameter is smaller than the first inner diameter and the third inner diameter. The inner connecting section is located in the second sub-channel and is fixed relative to the catheter seat. When the catheter includes an outer tube, the proximal end of the outer tube extends into the first sub-channel and is fixed relative to the catheter seat.

[0014] In one embodiment, the catheter hub includes a stress segment extending from its distal end to its proximal end, the axial length of the stress segment being less than the axial length of the first sub-channel; wherein, when the catheter includes an outer tube, and the proximal end of the outer tube extends into the first sub-channel and is fixed relative to the catheter hub;

[0015] The proximal end of the outer tube extending into the first sub-channel passes over the proximal end of the stress section, and a second gap is provided between the outer surface of the outer tube and the inner wall of the first sub-channel. The stress section of the catheter seat is provided with a second injection hole that communicates with the first sub-channel. The second injection hole is located in the middle of the stress section. Glue is injected into the second gap through the second injection hole to form a second connecting layer and a connecting protrusion located at the angle between the distal end of the stress section and the outer tube. The outer tube and the catheter seat are fixed relative to each other through the second connecting layer and the connecting protrusion.

[0016] In one embodiment, the first injection hole and / or the second injection hole are funnel-shaped, and the diameter of the funnel-shaped injection hole gradually increases from the inside to the outside.

[0017] In one embodiment, when the conduit seat is provided with a first injection hole that communicates with the first channel, the first injection hole is located at the middle position in the axial direction of the second sub-channel.

[0018] This invention features a connector fitted onto the proximal end of the inner tube of the catheter. After fixing the connector to the inner tube, an inner connecting segment is formed. The outer surface roughness of this inner connecting segment is greater than that of the inner tube. When connecting the inner tube to the catheter seat, the bonding area changes from the smooth inner tube in existing technologies to the rougher inner connecting segment, thus enhancing the bonding strength and strengthening the connection with the catheter seat, preventing leakage later. Simultaneously, the connector increases the support of the inner tube, preventing it from becoming misaligned after the UV-cured adhesive has cured, which would affect the guidewire passage. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an exemplary catheter of this utility model;

[0020] Figure 2 This is a partial connection diagram of the inner tube, connector, and catheter seat in an exemplary catheter of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of a catheter seat in an exemplary catheter of this utility model;

[0022] Figure 4 This is a partial structural diagram of the inner tube and connector in the exemplary catheter of this utility model after the fixing process.

[0023] Figure 5 for Figure 4 A schematic diagram of the radial section;

[0024] Figure 6 for Figure 2 An enlarged diagram of part A in the diagram;

[0025] Figure 7 This is a schematic diagram of the radial cross-section of the outer tube in an exemplary conduit of this utility model;

[0026] Figure 8 This is a schematic diagram of the structure of the constraint stent in the catheter of this utility model;

[0027] Figure 9 for Figure 1 An enlarged schematic diagram of part B in the diagram;

[0028] Figure 10 for Figure 2 An enlarged schematic diagram of part C in the diagram.

[0029] Figure label:

[0030] Catheter 100; First septum h1; Second septum h2;

[0031] Conduit seat 10; First channel 10a; First sub-channel 11; Second sub-channel 12; Third sub-channel 13; First injection hole 10b; Second injection hole 10c; Second channel 10d; Stress section 101;

[0032] Inner tube 20; Inner connecting section 26;

[0033] Outer tube 30; Tube body layer 31; Braided layer 32;

[0034] Balloon 40;

[0035] Constraint bracket 50; bracket body 51; connecting part 52; connecting rod 52a; connecting foot 52b;

[0036] Connector 60;

[0037] First connecting layer 711; first boss 712; second connecting layer 721; second boss 722; connecting protrusion 723;

[0038] Stress tube 80. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0041] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0045] Please see Figure 1 and Figure 2 This utility model provides an exemplary catheter 100, which includes at least an inner tube 20, a catheter seat 10, and a connector 60. The inner tube 20 is a tubular structure with a certain axial extension length, and the inner lumen of the inner tube 20 can be used to pass through a guide wire. The connector 60 and the inner tube 20 are fixed to each other after a fixing treatment, and the inner tube 20 and the connector 60 are fixed to the catheter seat 10 after the fixing treatment.

[0046] Specifically, in combination Figures 1-3 The catheter seat 10 has a first channel 10a along its axial direction. The first channel 10a can penetrate only one side end of the catheter seat 10 in the axial direction, such as the left or right end. The inner tube 20 and the connector 60 after being fixed can be inserted through this side through end. Preferably, in order to facilitate the guide wire to pass through and be pushed smoothly along the axial direction, the first channel 10a penetrates both sides of the catheter seat 10 in the axial direction, that is, an axial through hole is formed in the catheter seat 10. The inner tube 20 and the connector 60 after being fixed can be inserted into the first channel 10a of the catheter seat 10 from either through end.

[0047] Continue reading Figures 2-5 The connector 60 is fitted onto the proximal end of the inner tube 20 and, after being fixed, is relatively fixed to the inner tube 20 to form an inner connecting section 26. It can be understood that the inner connecting section 26 is a structure that simultaneously includes the connector 60 and the proximal end of the inner tube 20. The roughness of the outer surface of the connector 60, which is relatively fixed to the inner tube 20 (i.e., the roughness of the outer surface of the connector 60 after the fixing treatment), is greater than the roughness of the outer surface of the inner tube 20. The inner connecting section 26, formed after the fixing treatment, extends into the first channel 10a and is relatively fixed to the guide tube seat 10. The end of the inner tube 20 furthest from the connector 60 extends from the distal end of the guide tube seat 10. Figure 2 As shown, the distal end of the inner tube 20 extends from the distal end of the catheter seat 10.

[0048] In this embodiment, the roughness of the outer surface of the connector 60, which is fixed relative to the inner tube 20, is greater than the roughness of the outer surface of the inner tube 20. Specifically, after the connector 60 and the inner tube 20 are fixed relative to each other, the roughness of the outer surface of the connector 60, which is wrapped around the inner tube 20, is greater than the roughness of the outer surface of the inner tube 20. For example, the means to achieve the above limitation can be: before the connector 60 is connected to the inner tube 20, the roughness of the outer surface of the connector 60 can be greater than / less than / equal to the roughness of the outer surface of the inner tube 20; after the connector 60 and the inner tube 20 are fixed, the roughness of the outer surface of the connector 60, which is fixed relative to the inner tube 20, is greater than the roughness of the outer surface of the inner tube 20. The fixing process in this application refers to the process of fixing the inner tube 20 and the connector 60 relative to each other. The fixing process includes, but is not limited to, laser welding or hot-melt welding. Figure 4 and Figure 5 As shown, the connector 60 covering the inner tube 20 is made to face the inner tube 20 by laser welding or hot melt welding. After laser welding or hot melt welding, not only are the two fixedly connected, but also a concave-convex structure is formed on the surface of the connector 60. This makes the roughness of the outer surface of the inner connecting section 26 after fixing greater than the roughness of the outer surface of the inner tube 20 and the outer surface of the connector 60 before connection, thereby enhancing the connection strength when connected with the guide tube seat 10.

[0049] In this exemplary catheter 100, a connector 60 is fitted onto the proximal end of the inner tube 20. After the connector 60 is fixed relative to the inner tube 20, an inner connecting section 26 is formed. The roughness of the outer surface of the inner connecting section 26 after the fixing process is greater than the surface roughness of the inner tube 20. When the inner tube 20 is connected to the catheter seat 10, the bonding area changes from the smooth inner tube in the prior art to the relatively rough inner connecting section 26, thus enhancing the bonding force and strengthening the connection with the catheter seat 10, preventing leakage of the catheter later. At the same time, the connector 60 increases the support of the inner tube 20, preventing the inner tube from becoming misaligned after the UV-cured adhesive has cured, which would affect the passage of the guidewire.

[0050] For example, the material of the connector 60 can be one or more of nylon, Pebax, silicone, and TPU. The connector 60 can be a sleeve structure with a certain axial length, and the sleeve-shaped connector 60 is sleeved on the inner tube 20. It can also be other structures covering the outer surface of the inner tube 20, but it is not limited to these.

[0051] It is understood that the inner connecting segment 26 and the catheter seat 10 can be directly or indirectly connected. For example, the inner connecting segment 26 can be directly inserted into the first channel 10a to directly fix the inner connecting segment 26 and the catheter seat 10 (e.g., by direct laser welding). Alternatively, the two can be relatively fixed through a connecting layer. Figure 2and Figure 6 As shown, a first gap h1 is provided between the outer surface of the inner connecting section 26 and the inner wall of the first channel 10a. A first connecting layer 711 is provided in the first gap h1, and the inner connecting section 26 and the guide tube seat 10 are fixed relative to each other through the first connecting layer 711.

[0052] For example, as one implementation of forming the first connection layer 711, such as Figure 6 As shown, the conduit seat 10 has a first injection hole 10b communicating with the first channel 10a. Adhesive is injected into the first interval h1 through the first injection hole 10b to form a first connecting layer 711. This method is easy to manufacture and ensures connection strength. Of course, the formation method of the first connecting layer 711 is not limited to this. Preferably, the radial spacing of the first interval h1 is between 0.02mm and 0.1mm. This range ensures that the thickness of the first connecting layer 711 formed between the inner connecting section 26 and the conduit seat 10 is neither too thick nor too thin, ensuring sufficient adhesive quantity while preventing excessive adhesive thickness from causing severe volume shrinkage after curing, which would affect the later bonding stability.

[0053] Further, continue to refer to Figure 1 and Figure 2 The catheter 100 of this invention also includes an outer tube 30, which is a tubular structure with a certain axial extension length. The outer tube 30 is spaced outside the inner tube 20, and its proximal end is connected to the catheter seat 10. Preferably, the proximal end of the outer tube 30 is inserted into the catheter seat 10 and fixed relative to it, thus fixing the inner tube 20 and the outer tube 30 relative to each other. Of course, the proximal end of the outer tube 30 can also be movably connected to the catheter seat 10 after being inserted into it, for example, allowing the outer tube 30 to move axially relative to the inner tube 20. Please refer to... Figure 7 In one embodiment, to increase the strength of the outer tube 30, enhance the pushability of the conduit 100, and prevent the conduit 100 from kinking, the outer tube 30 includes a tube body layer 31 and a braided layer 32 fixed within the tube body layer 31. The outer tube 30 is spaced outside the inner tube 20, and its proximal end is fixed relative to the conduit seat 10. For example, the braided layer 32 has a mesh structure. During manufacturing, the tube body layer 31 can enter the mesh structure of the braided layer, so that the braided layer 32 is encased within the tube body layer 31, thereby achieving a fixed connection while ensuring connection strength.

[0054] Continue to refer to Figure 1 and Figure 2In one embodiment, the catheter 100 of this invention further includes a balloon 40. The distal end of the inner tube 20 extends from the distal end of the outer tube 30. The balloon 40 is sleeved on the inner tube 20, and the proximal end of the balloon 40 is fixedly connected to the distal end of the outer tube 30. The distal end of the balloon 40 is also fixedly connected to the distal end of the inner tube 20. When the balloon 40 is provided, the gap between the outer tube 30 and the inner tube 20 forms an filling cavity. In this case, the catheter seat 10 further provides a second channel 10d communicating with the first channel 10a. The second channel 10d further communicates with the filling cavity through the first channel 10a. For example, as shown... Figure 2 As shown, the catheter seat 10 includes an axially extending main body and a side branch portion disposed on the side of the main body. A first channel 10a is disposed on the main body and a second channel 10d is disposed on the side branch portion.

[0055] Continue to refer to Figure 1 , Figure 2 and Figure 8 As shown, in one embodiment, the catheter 100 of this utility model further includes a restraint stent 50, which is sleeved on the balloon 40. The proximal end of the restraint stent 50 is fixed to the distal end of the outer tube 30, and the distal end of the restraint stent 50 is fixed to the distal end of the inner tube 20. The restraint stent 50 is in a contracted state in its natural state. The restraint stent 50 can expand as the balloon 40 expands, and after the balloon 40 is depressurized, it can be retracted into a contracted state again and squeeze the balloon.

[0056] See Figures 7-9 The constraint stent 50 includes a stent body 51 and connecting portions 52 located at both ends of the stent body 51. Each end of the stent body 51 has at least one connecting portion 52 for connecting to the tube body. Each connecting portion 52 includes a connecting rod 52a connected to the stent body 51 and a connecting foot 52b connected to the connecting rod 52a. The connecting foot 52b has a sheet-like structure, and its radial cross-section is an arc shape convex outward relative to the central axis of the stent body 51. At least the proximal connecting foot 52b of the constraint stent 50 and the proximal tube foot of the balloon 40 are adapted to be attached to the distal outer periphery of the outer tube 30 and thermally fused to the distal end of the outer tube 30, so that the proximal connecting foot 52b is embedded in the tube body layer 31 of the outer tube 30. In this way, the constraint stent 50 is directly embedded in the braided outer tube 30, eliminating the need for a transition connecting tube, reducing product production costs while improving production efficiency. In other embodiments, the distal connecting foot 52b of the constraint stent 50 and the distal tube foot of the balloon 40 are adapted to be attached to the distal outer periphery of the inner tube 20 and thermally fused to the distal end of the inner tube 20, so that the distal connecting foot 52b is embedded in the tube body layer of the inner tube 20.

[0057] Continue reading Figure 8 and Figure 9Furthermore, in order to improve the connection strength between the constraint stent 50 and the outer tube 30, the connecting foot 52b is provided with a perforation that penetrates its inner and outer surfaces. This allows the tube body layer 31 of the outer tube 30 to fill the perforation when it melts during heat fusion, and the connecting foot 52b can be completely embedded in the braided outer tube 30. This ensures the connection strength between the connecting foot 52b and the outer tube 30 and avoids the formation of a connecting protrusion at the connecting foot 52b that could scratch the blood vessel wall.

[0058] Continue reading Figure 8 In one embodiment, multiple connecting portions 52 are provided at both ends of the support body 51. These connecting portions 52 on each side are spaced apart circumferentially, creating an open-loop shape that allows direct contact with the outer tube 30 without the need for a transition connecting tube, and accommodates outer tubes 30 with different radial dimensions. Preferably, all connecting portions 52 at both ends of the support body 51 are arranged in a staggered manner in the radial cross-section, ensuring that the support body 51 can expand after the balloon 40 inflates, and that a portion of the balloon 40 passes through the perforated window on the support body 51. For example, as... Figure 8 As shown, the two ends of the support body 51 are provided with two connecting parts 52 respectively. The connecting parts 52 on each side are radially opposite each other, and the lines connecting the two connecting parts 52 on both sides are perpendicular to each other.

[0059] Continue to refer to Figure 2 and Figure 3 As shown, the first channel 10a includes a first sub-channel 11 with a first inner diameter D1, a second sub-channel 12 with a second inner diameter D2, and a third sub-channel 13 with a third inner diameter D3. The first sub-channel 11, the second sub-channel 12, and the third sub-channel 13 are coaxially arranged and connected from far to near. The second inner diameter D2 is smaller than the first inner diameter D1 and the third inner diameter D3. The inner connecting section 26 is located in the second sub-channel 12 and is fixed relative to the catheter seat 10. When the catheter 100 includes an outer tube 30, the proximal end of the outer tube 30 extends into the first sub-channel 11 and is fixed relative to the catheter seat 10. The second inner diameter D2 is smaller than the first inner diameter D1 and the third inner diameter D3, which ensures that the channel apertures on both sides are larger, thus facilitating connection with the outer tube 30 and guidewire entry. At the same time, the middle aperture is smaller to meet the spacing requirements of the first interval h1 and ensure the stability of the connection. Preferably, the inner diameters of the first inner diameter D1 and the third inner diameter D3 are not limited; the inner diameters of the first inner diameter D1 and the third inner diameter D3 can be equal, or the inner diameter of the first inner diameter D1 can be greater than or less than the inner diameter of the third inner diameter D3. Understandably, when the second channel 10d is provided, the second channel 10d located at the side branch is connected to the first sub-channel 11.

[0060] Continue to refer to Figure 2 and Figure 3The axial length of the second sub-channel 12 is L12. When the conduit seat 10 is provided with a first glue injection hole 10b that connects to the first channel 10a, and glue is injected into the first interval h1 through the first glue injection hole 10b to form the first connecting layer 711, preferably, the first glue injection hole 10b is located in the middle position of the second sub-channel 12, so as to ensure that the glue can completely cover the length range of L12 during the glue dispensing process, ensuring the connection effect, and avoiding glue overflow causing blockage of the filling cavity.

[0061] Reference Figures 1-3 and Figure 10 The catheter seat 10 includes a stress segment 101 extending from its distal end to its proximal end. The stress segment 101 is an axial segment of the catheter seat 10 and is connected to the stress tube 80. The axial length L101 of the stress segment 101 is less than the axial length L11 of the first sub-channel 11. When the catheter 100 includes an outer tube 30, and the proximal end of the outer tube 30 extends into the first sub-channel 11 and is relatively fixed to the catheter seat 10, the proximal end of the outer tube 30 extending into the first sub-channel 11 passes beyond the proximal end of the stress segment 101, that is, the extension length of the outer tube 30 is greater than the axial length L101 of the stress segment 101, and a space is provided between the outer surface of the outer tube 30 and the inner wall of the first sub-channel 11. A second gap h2 is provided. The stress section 101 of the conduit seat 10 is provided with a second injection hole 10c that connects to the first sub-channel 11. The second injection hole 10c is located in the middle of the stress section 101. Adhesive is injected into the second gap h2 through the second injection hole 10c to form a second connecting layer 721 and a connecting protrusion 723 located at the angle between the distal end of the stress section 101 and the outer tube 30. The second connecting layer 721 and the connecting protrusion 723 fix the outer tube 30 and the conduit seat 10 relative to each other. In this embodiment, it is ensured that the adhesive completely covers the length range of L101 during the dispensing process, allowing the adhesive to overflow from the distal side of the second gap h2 and adhere to the distal end of the conduit seat 10, forming a connecting protrusion 723 at the end between the outer tube 30 and the conduit seat 10. This ensures connection strength, enhances sealing, and prevents adhesive overflow from clogging the near port of the outer tube 30.

[0062] Combination Figure 2 , Figure 6 and Figure 10 The first injection hole 10b and / or the second injection hole 10c are funnel-shaped, with the diameter of the funnel-shaped injection holes gradually increasing from the inside out. This forms a funnel-shaped first boss 712 in the first injection hole 10b and a funnel-shaped second boss 722 in the second injection hole 10c. The diameter of the funnel-shaped first boss 712 and the second boss 722 gradually increases from the inside out, preventing the inner tube 20 and inner tube 30 from falling off under axial force later, thereby ensuring the stability and sealing of the connection.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A catheter, characterized in that, The device includes an inner tube, a catheter seat, and a connector. The catheter seat has a first channel along its axial direction. The connector is sleeved on the proximal end of the inner tube and fixed relative to the inner tube to form an inner connecting section. The roughness of the outer surface of the connector, which is fixed relative to the inner tube, is greater than the roughness of the outer surface of the inner tube. The inner connecting section extends into the first channel and is fixed relative to the catheter seat. The end of the inner tube away from the connector extends from the distal end of the catheter seat.

2. The catheter according to claim 1, characterized in that, A first gap is provided between the outer surface of the inner connecting section and the inner wall of the first channel, and a first connecting layer is provided within the first gap, through which the inner connecting section is fixed relative to the conduit seat.

3. The catheter according to claim 2, characterized in that, The catheter seat is provided with a first injection hole that connects to the first channel, and the first bonding layer is formed by injecting adhesive into the first interval through the first injection hole.

4. The catheter according to claim 2, characterized in that, The radial spacing of the first interval is between 0.02 mm and 0.1 mm.

5. The catheter according to claim 1, characterized in that, It also includes an outer tube, which includes a tube body layer and a braided layer fixed inside the tube body layer. The outer tube is spaced outside the inner tube and its proximal end is fixed relative to the catheter seat.

6. The catheter according to claim 5, characterized in that, It also includes a balloon, the distal end of the inner tube extending from the distal end of the outer tube, the balloon being fitted over the inner tube and the proximal tube of the balloon being fixedly connected to the distal end of the outer tube, and the distal tube of the balloon being fixedly connected to the distal end of the inner tube.

7. The catheter according to claim 6, characterized in that, It also includes a restraint stent, which is fitted onto the balloon. The proximal end of the restraint stent is fixed to the distal end of the outer tube, and the distal end of the restraint stent is fixed to the distal end of the inner tube. The restraint stent is in a contracted state in its natural state and can expand as the balloon expands.

8. The catheter according to claim 7, characterized in that, The constraint stent includes a stent body and connecting portions located at both ends of the stent body. Each connecting portion includes a connecting rod connected to the stent body and a connecting foot connected to the connecting rod. The connecting foot is plate-shaped, and the radial cross-section of the connecting foot is an arc shape that convexes outward relative to the central axis of the stent body. At least the proximal connecting foot of the constraint stent and the proximal tube foot of the balloon are attached to the outer peripheral side of the distal end of the outer tube and are thermally fused to the distal end of the outer tube, such that the proximal connecting foot is at least partially embedded in the tube body layer of the outer tube.

9. The catheter according to any one of claims 1 to 8, characterized in that, The first channel includes a first sub-channel with a first inner diameter, a second sub-channel with a second inner diameter, and a third sub-channel with a third inner diameter. The first sub-channel, the second sub-channel, and the third sub-channel are coaxially arranged and connected from far to near. The second inner diameter is smaller than the first inner diameter and the third inner diameter. The inner connecting section is located in the second sub-channel and is fixed relative to the catheter seat. When the catheter includes an outer tube, the proximal end of the outer tube extends into the first sub-channel and is fixed relative to the catheter seat.

10. The catheter according to claim 9, characterized in that, The catheter hub includes a stress segment extending from its distal end to its proximal end, the axial length of which is less than the axial length of the first sub-channel; wherein, when the catheter includes an outer tube, and the proximal end of the outer tube extends into the first sub-channel and is fixed relative to the catheter hub; The proximal end of the outer tube extending into the first sub-channel passes over the proximal end of the stress section, and a second gap is provided between the outer surface of the outer tube and the inner wall of the first sub-channel. The stress section of the catheter seat is provided with a second injection hole that communicates with the first sub-channel. The second injection hole is located in the middle of the stress section. Glue is injected into the second gap through the second injection hole to form a second connecting layer and a connecting protrusion located at the angle between the distal end of the stress section and the outer tube. The outer tube and the catheter seat are fixed relative to each other through the second connecting layer and the connecting protrusion.

11. The catheter according to claim 3 or 10, characterized in that, The first and / or second injection holes are funnel-shaped, with the diameter of the funnel-shaped injection holes gradually increasing from the inside out.

12. The catheter according to claim 9, characterized in that, When the conduit seat is provided with a first injection hole that connects to the first channel, the first injection hole is located at the middle position in the axial direction of the second sub-channel.

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