A method for fixing a tube body, a catheter, and a contrast ring embedded in the catheter.

Abstract

This application discloses a tube body, a guide tube, and a method for fixing a developing ring embedded in the guide tube. The tube body is used to receive the developing ring and includes a main body portion and a connecting portion. Along the circumference of the connecting portion, at least a portion of the connecting portion forms a receiving area. From the end of the receiving area connected to the main body portion to the direction away from the main body portion of the connecting portion, the outer wall of the receiving area forms an inclined surface. From the main body portion to the connecting portion, the inclined surface gradually slopes towards the central axis of the tube body. The developing ring is sleeved outside the receiving area. First, the developing ring is sleeved outside the receiving area of ​​the tube body, then another tube body is sleeved outside the developing ring, and then a heat shrink tube is sleeved at the connection between the two tube bodies. At the same time, heating and radial pressure are applied. Due to the presence of the inclined surface, the vertical radial pressure can be dispersed through the inclined surface, thereby significantly improving the axial thermal fusion effect of the two tube bodies at the inclined surface and avoiding weld breaks.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more specifically to a tube body, a catheter including the tube body, and a method for fixing a catheter-embedded radiopaque ring in the catheter to obtain the catheter. Background Technology

[0002] In the prior art, the developing ring is often embedded inside the conduit; the conduit includes two tubes, the developing ring is first sleeved on the outer wall of one of the conduits, and then the other conduit is sleeved on the outside of the developing ring, and the two conduits are heat-shrink fused together so that the developing ring is embedded in the sleeve area of ​​the two tubes.

[0003] The outer wall of the tube that receives the developing ring needs to be thinned to form a connecting part that receives the developing part; during the thinning process of the outer wall of the tube, vertical steps are often formed (e.g., Figure 1 The end of the other tube, which is fitted over the developing ring, is often directly connected to the vertical step (e.g., Figure 2 When performing heat shrink welding using tooling (or heat shrink tubing), radial pressure is applied (e.g., ...). Figure 3 Because the stepped surface is vertically set, the force distributed perpendicularly through the stepped surface is almost negligible, ultimately leading to a deviation in the axial thermal fusion effect of the two pipes at the stepped surface, and even the appearance of weld fracture (such as...). Figure 4 ). Summary of the Invention

[0004] In view of this, this application provides a tube body, a conduit including the tube body, and a method for fixing a radiopaque ring embedded in the conduit to obtain the conduit, which solves the problem of deviation in the thermal fusion effect of the two tube bodies with the radiopaque ring embedded, and even the problem of weld breakage.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A tube for receiving a developing ring, the tube comprising a body portion and a connecting portion located at one end of the body portion along its axial direction;

[0007] Along the circumferential direction of the connecting portion, at least a portion of the connecting portion forms a receiving area, and from the end of the receiving area connected to the body portion to the direction of the connecting portion away from the body portion, the outer sidewall of the receiving area forms an inclined surface;

[0008] From the main body to the connecting part, the inclined surface gradually slopes towards the central axis of the tube body;

[0009] The developing ring is fitted outside the receiving area.

[0010] Optionally, in the tube body described above, the end of the developing ring abuts against the inclined surface.

[0011] Optionally, in the above-mentioned pipe body, the connecting part forms a circumferential receiving area.

[0012] Optionally, in the tube body described above, from the main body to the connecting part, the outer wall of the receiving area sequentially includes the inclined surface and the first flat curved surface, and the developing ring is sleeved on the outside of the first flat curved surface.

[0013] Optionally, in the above-mentioned pipe body, the connecting part has an expansion area in the area other than the receiving area, and the receiving area and the expansion area are separately provided;

[0014] The inclined surface extends from one end of the receiving area to the other end of the receiving area;

[0015] From the main body to the connecting part, the expansion area gradually slopes away from the central axis of the tube body;

[0016] The developing ring is located within the expansion region.

[0017] Optionally, in the above-mentioned pipe body, multiple sets of the receiving area and the expansion area are arranged in a cyclical manner.

[0018] Optionally, in the above-mentioned tube body, the connecting part is a structure that surrounds the semicircle of the tube body. The connecting part of the tube body has a hollowed-out part on the opposite side in the circumferential direction. The developing ring can be supported by the connecting part, and a part of the developing ring is sleeved on the receiving area of ​​the semicircle, while the other part is located in the hollowed-out part.

[0019] Optionally, in the above-mentioned tube, the inclination angle of the inclined surface is 10°-80°.

[0020] A catheter includes a first tube body and a second tube body; the first tube body and / or the second tube body are the tube bodies described above.

[0021] Optionally, in the above-mentioned conduit, the first tube body includes a first body portion and a first connecting portion located at one end of the first body portion along its axial direction; the first connecting portion forms a circumferential receiving area.

[0022] The second tube body includes a circumferential second connecting portion; the second connecting portion is sleeved outside the developing ring.

[0023] Optionally, in the above-described conduit, when the first connecting portion and the second connecting portion are not fixed, the second connecting portion extends and overlaps the outer periphery of the first body portion.

[0024] Optionally, in the above-mentioned conduit, the second tube body includes a second body portion and a second connecting portion located at one end of the second body portion along its axial direction;

[0025] In the direction from the second body part to the second connecting part, the inner wall of the second connecting part includes an expansion surface and a second straight curved surface, and the expansion surface gradually tilts away from the central axis of the second tube body;

[0026] The developing ring is located within the second flat curved surface.

[0027] Optionally, in the above-described catheter, the end of the radiopaque ring abuts against the dilation surface.

[0028] Optionally, in the above-mentioned conduit, the first tube body and the second tube body have the same structure;

[0029] The receiving area of ​​the first pipe body is opposite to the expansion area of ​​the second pipe body;

[0030] When the first tube and the second tube are not fixed, the developing ring is sleeved within the receiving area of ​​the first tube and the receiving area of ​​the second tube, and the developing ring is located outside the receiving area of ​​the first tube and the receiving area of ​​the second tube.

[0031] Optionally, both the first tube and the second tube are tubes as described above. The connecting part is a structure that surrounds the semicircle of the tube. The connecting part of each tube has a hollow part on the opposite side in the circumferential direction. The developing ring can be supported by the connecting part. A portion of the developing ring is sleeved on the receiving area of ​​the semicircle, and the other portion is located in the hollow part.

[0032] When the first tube and the second tube are aligned, the connecting part of the first tube is positioned relative to the hollow part of the second tube, and the hollow part of the first tube is positioned relative to the connecting part of the second tube. The connecting part of the first tube extends into the inner side of the developing ring of the second tube and abuts against the port of the second tube. The connecting part of the second tube extends into the inner side of the developing ring of the first tube and abuts against the port of the first tube. An outer sleeve is provided on the outside of the first tube and the second tube to cover the developing rings on the two tubes.

[0033] A method for fixing a contrast-enhancing ring embedded in a catheter, applicable to the catheter described above, the method comprising:

[0034] The first tube is fitted onto the outside of the mandrel;

[0035] The developing ring is fitted onto the first connecting part of the first tube body;

[0036] The second tube is fitted over the mandrel, and the second connecting part of the second tube is fitted over the developing ring.

[0037] The heat shrink tubing is fitted over the first and second connecting parts.

[0038] The heat shrink tubing is heated to shrink it, causing the first and second connecting parts to melt and bond together.

[0039] In the fixing method of the tube body, guide tube, and embedded developing ring provided in this application, the connecting part of the tube body no longer forms a vertical stepped surface, but an inclined surface is formed in the receiving area; when the two tube bodies are heat-shrink welded using a tooling mold, the developing ring is first fitted outside the receiving area of ​​the tube body, then the other tube body is fitted outside the developing ring, and then the heat-shrink tube is fitted at the connection of the two tube bodies. At the same time, heating and radial pressure are applied. Due to the presence of the inclined surface, the vertical radial pressure can be dispersed to pass through the inclined surface, thereby significantly improving the axial heat fusion effect of the two tube bodies at the inclined surface and avoiding weld breakage. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of a tube in the prior art;

[0042] Figure 2 This is a schematic diagram of the structure in which the first tube body and the second tube body mate in the prior art;

[0043] Figure 3 This is a schematic diagram of a heat-shrinkable welding structure for a conduit in the prior art;

[0044] Figure 4 This is a schematic diagram of the structure of a conduit after heat shrink welding in the prior art;

[0045] Figure 5 This is a schematic diagram of the structure of the tube in this application;

[0046] Figure 6 This is a schematic diagram of the structure of the first tube and the second tube in this application.

[0047] Figure 7 This is a schematic diagram of the structure of the conduit in Embodiment 1 of this application under state one of heat shrink welding;

[0048] Figure 8 This is a schematic diagram of the second state of heat-shrink welding of the conduit in Embodiment 1 in this application;

[0049] Figure 9 for Figure 7 A magnified view of part A in the middle;

[0050] Figure 10 This is a schematic diagram of the structure of the conduit after heat shrink welding in this application;

[0051] Figure 11 This is an exploded view of the conduit in Embodiment 2 of this application;

[0052] Figure 12 This is an exploded view of the conduit in Embodiment 2 of this application from another angle;

[0053] Figure 13 for Figure 11 Floor plan;

[0054] Figure 14 for Figure 11 A sectional view;

[0055] Figure 15 This is a schematic diagram of the structure of the first tube body in the conduit of Embodiment 3 of this application;

[0056] Figure 16 This is a schematic diagram of the structure of the second tube in the conduit of Embodiment 3 of this application;

[0057] Figure 17 This is a schematic diagram of the catheter structure in Embodiment 3 of this application;

[0058] Figure 18 This is a schematic diagram of the heat-shrink welding structure of the conduit in Example 3 of this application;

[0059] Figure 19 for Figure 17 A sectional view.

[0060] Figures 1-19 middle:

[0061] 1. First tube body; 2. Second tube body; 3. Developing ring; 4. Mandrel; 5. Heat shrink tubing; 6. Welded joint;

[0062] 11. First body part; 12. First connecting part;

[0063] 21. Second body part; 22. Second connecting part;

[0064] 121. Receiving Area; 122. Expansion Area;

[0065] 221. Expansion surface; 222. Second straight curved surface;

[0066] 1211, Inclined surface; 1212, First straight curved surface. Detailed Implementation

[0067] This application provides a tube body, and also provides a catheter including the tube body and a method for fixing a radiopaque ring embedded in the catheter.

[0068] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0069] like Figure 5-18 As shown, a tube body is used to receive a developing ring 3. The tube body includes a main body portion and a connecting portion located at one end of the main body portion along its axial direction. Along the circumferential direction of the connecting portion, at least a portion of the connecting portion forms a receiving area 121, and the outer wall of the receiving area 121 forms an inclined surface 1211. From the main body portion to the connecting portion, the inclined surface 1211 gradually slopes towards the central axis of the tube body. The developing ring 3 is fitted over the receiving area 121.

[0070] It should be noted that medical catheters are typically equipped with a contrast ring 3 at the tip to help doctors determine the catheter's position within the body. The contrast ring 3 is usually made of platinum (platinum-iridium alloy) or other high-density metals.

[0071] The contrast ring 3 embedded in the catheter is located at the rear end of the catheter (in medical devices, the end closer to the surgeon is the front end, and the end further away from the surgeon is the rear end).

[0072] This application provides a tube body specifically for receiving the developing ring 3. The connecting part of the tube body has a receiving area 121 with the outer wall thinned. The space volume of the thinned connecting part just provides the receiving space for receiving the developing ring 3.

[0073] First, the developing ring 3 is fitted over the receiving area. Then, the other tube is fitted over the developing ring 3. During heat shrink welding, the vertical radial pressure is dispersed across the inclined surface, thus significantly improving the axial heat fusion effect of the two tubes at the inclined surface and preventing weld breakage 6 (please refer to the instruction manual for the structural form of weld breakage 6). Figure 4 ).

[0074] In some embodiments of this application, the end of the developing ring 3 abuts against the inclined surface 1211.

[0075] As shown above, the inclined surface 1211 not only positions the developing ring 3, but also allows the molten material of the other tube outside the developing ring 3 to flow smoothly into the gap at the joint of the two tubes through the inclined angle of the inclined surface 1211, thereby improving the connection strength of the two tubes.

[0076] Please see the appendix Figure 5-14 In some embodiments of this application, the connecting portion forms a circumferential receiving area 121.

[0077] The receiving area 121 of the tube body is a tubular structure, and the annular developing ring 3 is circumferentially fitted onto the receiving area 121, whose outer wall is thinned. Correspondingly, the connecting part of the other tube body is configured as an annular fitting area with a thinned inner wall; the fitting area fits onto the outside of the developing ring 3.

[0078] As shown above, the receiving area 121 of the tube body has a simple structure, is easy to manufacture and process, and facilitates the connection between the first tube body 1 that receives the developing ring 3 and the second tube body 2 that sleeves the developing ring 3.

[0079] In some embodiments of this application, from the body portion to the connecting portion, the outer wall of the receiving area 121 sequentially includes an inclined surface 1211 and a first flat curved surface 1212, and the developing ring 3 is sleeved outside the first flat curved surface 1212 and abuts against the inclined surface 1211.

[0080] It should be noted that the direction from the main body to the connecting part is the attachment. Figure 5 The direction indicated by the middle arrow.

[0081] As described above, this ensures that the developing ring 3 makes a close and fitting contact with the first flat curved surface 1212, thereby ensuring a reliable and stable receiving effect of the developing ring 3 in the receiving area 121.

[0082] Please see the appendix Figure 15-19 In some embodiments of this application, the connecting portion has an expansion region 122 formed in the area other than the receiving region 121, and the receiving region 121 and the expansion region 122 are separately provided. An inclined surface 1211 extends from one end of the receiving region 121 to the other end. From the body portion to the connecting portion, the expansion region 122 gradually slopes away from the central axis of the tube body. The developing ring 3 is located outside the receiving region 121 and inside the expansion region 122.

[0083] It should be noted that the annular connecting part is cut open to obtain multiple split parts; one of the split parts is slightly turned at a small angle away from the central axis of the tube to obtain the expansion zone 122; another split part is slightly heated and stretched to become thinner to obtain the receiving zone 121.

[0084] It should be further explained that when the connecting part of the pipe body is set as a split structure combining the receiving area 121 and the expansion area 122, the connecting part of the other pipe body is also set as a split structure combining the receiving area 121 and the expansion area 122; at this time, the two pipe bodies are named the first pipe body 1 and the second pipe body 2 respectively.

[0085] Please see the appendix Figure 17 , 19 When receiving the developing ring 3, the receiving area 121 of the first tube body 1 and the expansion area 122 of the second tube body 2 are positioned opposite each other, and the expansion area 122 of the first tube body 1 and the receiving area 121 of the second tube body 2 are positioned opposite each other. First, the developing ring 3 is fitted onto the receiving area 121 of the first tube body 1, with the expansion area 122 of the first tube body 1 located outside the developing ring 3; then, the receiving area 121 of the second tube body 2 is inserted into the developing ring 3, with the expansion area 122 of the second tube body 2 located outside the developing ring 3. The receiving area 121 of the first tube body 1 and the receiving area 121 of the second tube body 2 combine to form an annular receiving area; the expansion area 122 of the first tube body 1 and the expansion area 122 of the second tube body 2 combine to form an annular fitting area.

[0086] As shown above, the structural form of the connecting part of the tube body that receives the developing ring 3 is further enriched, and users can choose according to their actual needs, making it highly flexible and applicable.

[0087] In some embodiments of this application, multiple sets of receiving area 121 and expansion area 122 are arranged in a cyclic manner.

[0088] As shown above, multiple receiving areas 121 are arranged at intervals along the circumference of the connecting part, which facilitates circumferential support for the developing ring 3 and ensures the receiving effect of the developing ring 3.

[0089] Preferably, the connecting part of the pipe body is cut into four separate parts; two oppositely positioned separate parts are processed to form two expansion areas 122, and two oppositely positioned separate parts are processed to form two receiving areas 121.

[0090] In some embodiments of this application, the tilt angle of the tilted surface 1211 is θ, and the value of θ ranges from 10° to 80°.

[0091] Please refer to the appendix for details. Figure 5 , 9The two sleeved tubes are named tube 1 and tube 2, respectively. Tube 1 and tube 2 are subjected to a component of radial pressure F, i.e., Fcosθ, at the joint of inclined surface 1211. As the angle θ becomes more gentle, the component of radial pressure Fcosθ increases. When the angle θ is 90°, the component of radial pressure Fcosθ is 0. At this time, the extrusion force of the molten material is sufficient, which is not conducive to the fusion between the interfaces. This application limits the inclination angle of inclined surface 1211 to the above range, which can well ensure the fusion effect at the joint of the two tubes and avoid the occurrence of fusion discontinuity.

[0092] In summary, this application also provides a catheter; the catheter includes a first tube body 1 and a second tube body 2, wherein the first tube body 1 and / or the second tube body are the tube bodies described above.

[0093] Since the catheter of this application includes the tube body described above, the beneficial effects of the tube body are described above and will not be repeated here.

[0094] Example 1

[0095] Please see the appendix Figure 5-10 The first tube body 1 of the catheter includes a first body portion 11 and a first connecting portion 12; the first connecting portion 12 forms a circumferential receiving area 121; the outer wall of the receiving area 121 successively includes an inclined surface 1211 and a first straight curved surface 1212, and the imaging ring 3 is sleeved on the first straight curved surface 1212. The second tube body 2 of the catheter includes a circumferential second connecting portion 22; the second connecting portion 22 is sleeved on the imaging ring 3. In this embodiment, the second tube body 2 does not have a second body portion 21, so the second tube body 2 does not have the function of extending the length of the catheter, but only serves to cover the imaging ring 3.

[0096] Please see the appendix Figure 7 , 9 Furthermore, when the first connecting part 12 and the second connecting part 22 are not fixed, the second connecting part 22 extends and overlaps the outer periphery of the first body part 11.

[0097] The method for fixing the first tube 1 and the second tube 2 is as follows: ① Sleeve the first tube 1 over the mandrel 4; ② Sleeve the developing ring 3 over the first straight curved surface 1212, and make the end of the developing ring 3 abut against the inclined surface 1211; ③ Sleeve the second tube 2 over the mandrel 4, and at the same time make the second connecting part 22 circumferentially sleeved over the developing ring 3, and push the second connecting part 22 along the inclined surface 1211 to overlap the outer periphery of the first body part 11; ④ Sleeve the heat shrink tube 5 over the second connecting part 22; ⑤ Heat the heat shrink tube 5, and then shrink the heat shrink tube 5, so that the first connecting part 12 and the second connecting part 22, which have been heated and melted, are thermally bonded together; ⑥ After cooling, remove the heat shrink tube 5 and the mandrel 4 to obtain the finished catheter.

[0098] It should be noted that the pushing direction of the second connecting part 22 is the same as that of the attached part. Figure 6 The direction indicated by the middle arrow.

[0099] It should be further explained that during the heat shrink welding process using the heat shrink tubing 5, the first connecting part 12 and the second connecting part 22 at the connection point on the inclined surface 1211 are subjected to a component of the radial pressure F of the outer periphery of the heat shrink tubing 5 (see...). Figure 6 Furthermore, the inclined surface 1211 provides a flow slope for the molten material of the second connecting part 22 in both the radial and axial directions, making it easier for the molten material of the second connecting part 22 to fill and cover the inclined surface 1211 of the first connecting part 12 under the shrinkage pressure of the heat shrink tube 5 and the guidance of the inclined surface 1211, as well as to fill and cover the gap at the joint between the developing ring 3 and the inclined surface 1211, making the connection between the first connecting part 12 and the second connecting part 22 tighter; and the oblique pressure of the second connecting part 22 on the inclined surface 1211 of the first connecting part 12 can also make it easier to squeeze out the air in the gap between the developing ring 3 and the joint on the inclined surface 1211, avoiding the phenomenon of air bubbles appearing at the position of the developing ring 3 after connecting the second connecting part 22 and the first connecting part 21; finally, after cooling and shaping, a finished product with a tapered rear end embedded in the developing ring 3 is obtained.

[0100] Example 2

[0101] Please see the appendix Figure 11-14 The difference between Example 2 and Example 1 is as follows:

[0102] In addition to the second connecting portion 22, the second tube body 2 also includes a second body portion 21. In the direction from the second body portion 21 to the second connecting portion 22, the inner wall of the second connecting portion 22 includes an expansion surface 221 and a second straight curved surface 222. Furthermore, in the direction from the second body portion 21 to the second connecting portion 22, the expansion surface 221 gradually slopes away from the central axis of the second tube body 2.

[0103] It should be noted that the direction from the second body portion 21 to the second connecting portion 22 is the attached direction. Figure 14 The direction indicated by the middle arrow.

[0104] In this embodiment, the first tube 1 has a first connecting portion 12 with its outer wall thinned, and the second tube 2 has a second connecting portion 22 with its inner wall thinned. The second tube 2 has a second body portion 21, so the second tube 2 also has the functions of extending the catheter length and covering the imaging ring 3.

[0105] Furthermore, the developing ring 3 is sleeved outside the first flat curved surface 1212, and the first end of the developing ring 3 abuts against the inclined surface 1211; the second flat curved surface 222 is sleeved outside the developing ring 3, and the second end of the developing ring 3 abuts against the expansion surface 221.

[0106] As described above, this further ensures the positioning of the expansion surface 221 embedded between the first tube 1 and the second tube 2, as well as the secure fixing effect.

[0107] The method for fixing the first tube 1 and the second tube 2 is as follows: ① The first tube 1 is sleeved on the outside of the mandrel 4; ② The developing ring 3 is sleeved on the first straight curved surface 1212, and the first end of the developing ring 3 abuts against the inclined surface 1211; ③ The second tube 2 is sleeved on the outside of the mandrel 4, and the second straight curved surface 222 is circumferentially sleeved on the outside of the developing ring 3, and the second end of the developing ring 3 abuts against the expansion surface 221. At the same time, the second straight curved surface 222 is pushed along the inclined surface 1211 to overlap the outer periphery of the first body part 11; ④ The heat shrink tube 5 is sleeved on the outside of the second connecting part 22; ⑤ The heat shrink tube 5 is heated and then shrunk, so that the first connecting part 12 and the second connecting part 22 are heat-fused and bonded together; ⑥ After cooling, the heat shrink tube 5 and the mandrel 4 are removed to obtain the finished catheter.

[0108] Example 3

[0109] Please see the appendix Figure 15-19 The first pipe body 1 and the second pipe body 2 have the same structure; the first connecting part 12 of the first pipe body 1 includes a separate receiving area 121 and an expansion area 122; the second connecting part 22 of the second pipe body 2 also includes a separate receiving area 121 and an expansion area 122. The receiving area 121 of the first pipe body 1 and the expansion area 122 of the second pipe body 2 are opposite to each other.

[0110] When the first tube 1 and the second tube 2 are not fixed, the developing ring 3 is sleeved inside the receiving area 121 of the first tube 1 and inside the receiving area 121 of the second tube 2; and the developing ring 3 is located outside the receiving area 121 of the first tube 1 and outside the receiving area 121 of the second tube 2.

[0111] The method for fixing the first tube 1 and the second tube 2 is as follows: ① Sleeve the first tube 1 over the mandrel 4; ② Sleeve the developing ring 3 over the receiving area 121 of the first tube 1, and place the expansion area 122 of the first tube 1 outside the developing ring 3; ③ Sleeve the second tube 2 over the mandrel 4, and insert the receiving area 121 of the second tube 2 into the developing ring 3, and place the expansion area 122 of the second tube 2 outside the developing ring 3; ④ Sleeve the heat shrink tube 5 over the first connecting part 12 and the second connecting part 22; ⑤ Heat the heat shrink tube 5, and then shrink it, so that the receiving area 121 of the heated and molten first tube 1 and the expansion area 122 of the second tube 2 are heat-fused together, and at the same time, the expansion area 122 of the heated and molten first tube 1 and the receiving area 121 of the second tube 2 are heat-fused together; ⑥ After cooling, remove the heat shrink tube 5 and the mandrel 4 to obtain the finished catheter.

[0112] Example 4

[0113] Both the first and second tubes are tubes with the aforementioned receiving area, and they have the same structure. The connecting part is a semi-circular structure around the tube body. On opposite sides of the connecting part in the circumferential direction, there is a hollow section. The developing ring can be supported by the connecting part, and part of the developing ring is fitted onto the receiving area of ​​the semi-circumference, while the other part is located in the hollow section; see reference. Figure 15-19 The difference between this embodiment and embodiment 3 is that this embodiment does not include an expansion area structure. That is, the position that originally belonged to the expansion area is a hollow part in this embodiment, and the receiving area of ​​the connecting part is a semi-circular structure.

[0114] When the first and second tubes are aligned, the connecting portion of the first tube is positioned opposite the hollow portion of the second tube, and the hollow portion of the first tube is positioned opposite the connecting portion of the second tube. The connecting portion of the first tube extends into the inner side of the developing ring of the second tube and abuts against the port of the second tube. This arrangement prevents the inner walls of the two tubes from protruding when they extend into each other, and the two tubes, when joined, form a complete circumferential bearing surface, allowing the developing ring to fit over both tubes. An outer sleeve is provided on the outside of the first and second tubes to cover the developing rings on both tubes, preventing them from being exposed. The outer sleeve, together with the first and second tubes, forms a guide tube with a smooth outer surface.

[0115] In summary, this application also provides a method for fixing a contrast-enhancing ring embedded in a catheter; this catheter fixing method is applicable to the catheters described above, and the fixing method includes:

[0116] ① Fit the first tube 1 onto the outside of the mandrel 4;

[0117] ② The developing ring 3 is fitted onto the first connecting part 12 of the first tube body 1;

[0118] ③ Sleeve the second tube 2 over the core rod 4, and sleeve the second connecting part 22 of the second tube 2 over the developing ring 3;

[0119] ④ Slide the heat shrink tubing 5 onto the outside of the first connecting part 12 and the second connecting part 22;

[0120] ⑤ Heat the heat shrink tubing 5 to shrink it, so that the first connecting part 12 and the second connecting part 22, which have been heated and melted, are bonded together.

[0121] The mandrel 4 can support and fix the first tube body 1 and the second tube body 2, avoiding the deformation of the first body part 11 and the second body part 21 caused by the radial pressure applied during the heat shrink welding process; the heat shrink welding method can effectively connect the first connecting part 12 and the second connecting part 22 together and ensure a smooth splicing effect; at the same time, the imaging ring 3 is perfectly embedded in the catheter, the imaging ring 3 will not protrude from the catheter surface and will not damage the blood vessel wall. The imaging ring 3 is firmly embedded and stable, and will not be misaligned during operation, ensuring the accurate positioning of the catheter in the blood vessel.

[0122] The catheter described in this application is used for percutaneous delivery into a patient's blood vessels during interventional procedures, such as in filter retrieval sheaths, thrombectomy catheters, or stent delivery catheters. Typically, the catheter is quite long, reaching over one meter. The imaging ring 3 is positioned at the distal end of the catheter, in the operator's direction of operation, facilitating observation of the catheter's entry into the blood vessel. Therefore, the imaging ring 3 must not be exposed or excessively protruding, causing scratches to the catheter wall or friction with the retrieved filter. The embedded imaging ring 3 design of this application achieves good catheter flexibility, allowing it to conform to the curves of the blood vessel and be delivered to the target location, while simultaneously improving safety during delivery by preventing the embedded imaging ring 3 from being exposed or protruding.

[0123] The components and devices described in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the accompanying drawings. As those skilled in the art will recognize, these components and devices can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the words “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0124] It should also be noted that in the apparatus of this application, the components can be disassembled and / or reassembled. These disassemblies and / or reassemblies should be considered as equivalent solutions of this application.

[0125] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be applied within the widest scope consistent with the principles and novel features disclosed herein.

[0126] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

[0127] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A tube body for receiving a developing ring (3), characterized in that, The tube body includes a main body and a connecting part located at one end of the main body along its axial direction. Along the circumferential direction of the connecting portion, at least a portion of the connecting portion forms a receiving area (121), and from the end of the receiving area (121) connected to the body portion to the direction of the connecting portion away from the body portion, the outer side wall of the receiving area (121) forms an inclined surface (1211). From the main body to the connecting part, the inclined surface (1211) gradually tilts towards the central axis of the tube body; The connecting part has an expansion area (122) in the area other than the receiving area (121), and the receiving area (121) and the expansion area (122) are separately provided; The inclined surface (1211) extends from one end of the receiving area (121) to the other end of the receiving area (121); From the main body to the connecting part, the expansion area (122) gradually tilts away from the central axis of the tube body; The developing ring (3) is sleeved outside the receiving area (121), and the developing ring (3) is located inside the expansion area (122).

2. The tube body according to claim 1, characterized in that, The receiving area (121) and the expansion area (122) are arranged in multiple sets in a cyclical manner.

3. The tube body according to claim 1 or 2, wherein the inclination angle of the inclined surface (1211) is 10°-80°.

4. A catheter, characterized in that, It includes a first tube (1) and a second tube (2); the first tube (1) and / or the second tube (2) are the tubes described in claim 1.

5. The catheter according to claim 4, characterized in that, Both the first tube (1) and the second tube (2) are tubes as described in claim 1 or 2; The receiving area of ​​the first pipe body (1) is opposite to the expansion area of ​​the second pipe body (2), and the expansion area of ​​the first pipe body (1) is opposite to the receiving area of ​​the second pipe body (2). When the first tube (1) and the second tube (2) are not fixed, the developing ring (3) is sleeved in the receiving area of ​​the first tube (1) and the receiving area of ​​the second tube (2), and the developing ring (3) is located outside the receiving area of ​​the first tube (1) and the receiving area of ​​the second tube (2).

6. A method for fixing a contrast-enhancing ring embedded in a catheter, characterized in that, For catheters applicable to claim 4 or 5, the method for fixing the radiopaque ring embedded in the catheter includes: The first tube is fitted onto the outside of the mandrel; The developing ring is fitted onto the first connecting part of the first tube body; The second tube is fitted over the mandrel, and the second connecting part of the second tube is fitted over the developing ring. The heat shrink tubing is fitted over the first and second connecting parts. The heat shrink tubing is heated to shrink it, causing the first and second connecting parts to melt and bond together.

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