Tubular interventional member

Abstract

The utility model provides a tubular interventional member, which comprises a catheter, an expandable body with a compression state and an adjusting assembly for adjusting the axial working length of the expandable body, the adjusting assembly comprises a sleeve piece, the sleeve piece is movably sleeved on the periphery of the catheter along the axial direction of the catheter, and the sleeve piece is sleeved on the periphery of the catheter along the axial direction of the catheter. The inner diameter of the sleeve piece is larger than the outer diameter of the expandable body in the compressed state, and the radial rigidity of the sleeve piece is set to be capable of limiting the expandable body located in the sleeve piece from expanding in the radial direction in the self-compressed state. The traction structure comprises at least two traction wires which are distributed along the periphery of the catheter at intervals, the traction wires extend in the axial direction of the catheter, the far ends of the traction wires are connected to the sleeve piece, and the near ends of the traction wires extend towards the near end of the catheter; the axial working length of the expandable body can be adjusted according to the length of a lesion position; meanwhile, the external member can be driven to be bent by pulling one traction wire towards the near end, and the bending adjusting function is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medical apparatus and instruments, especially to a tubular interventional component. BACKGROUND

[0002] Tubular interventional components with inflatable bodies are widely used in applications related to vascular treatment. For example, arterial stenosis is usually treated by angioplasty, the most widely used angioplasty is to use a tubular interventional component with an inflatable body at the distal end thereof, under X-ray contrast, a doctor passes a catheter in the tubular interventional component through the vascular system until the inflatable body passes through the stenosis, and then the inflatable body is flushed into a liquid under a certain pressure through a filling cavity, so that the inflatable body is inflated to expand the vascular stenosis.

[0003] Generally, the size of the inflatable body in the tubular interventional component is determined according to the size of the lesion site, that is, the length of the lesion of each patient is different, and the manufacturer designs inflatable bodies of different lengths according to previous experience, such as 6mm, 9mm, 12mm, 15mm, 18mm, 21mm or even more models, so in the inflatable body forming process, different sizes of forming molds need to be preset to process the inflatable body tube and make it plastic, and the existing forming mold can only process one size of inflatable body, that is, one mold can only process one size of inflatable body, and the changeover time is long during the forming process, and if the preset inflatable body is 9mm or 12mm, when the lesion length is 10mm or 11mm, only the longer 12mm inflatable body can be selected, and the too long inflatable body will inevitably cause certain damage to the normal blood vessels, which has certain safety hazards. SUMMARY

[0004] The utility model aims at providing a tubular interventional component.

[0005] To solve the above problems, the utility model provides a tubular interventional component, which comprises a catheter, an inflatable body sleeved and fixedly connected to the distal end of the catheter, the inflatable body has a compressed state and an inflated state, the tubular interventional assembly further comprises an adjusting assembly for adjusting the axial working length of the inflatable body, and the adjusting assembly comprises:

[0006] A sleeve is movably sleeved on the outer periphery of the catheter along the axial direction of the catheter, the inner diameter of the sleeve is greater than the outer diameter of the inflatable body in the compressed state, the inner diameter of the sleeve is less than the outer diameter of the inflatable body in the inflated state, and the radial stiffness of the sleeve is set to be able to limit the inflatable body located in the sleeve from expanding radially from the compressed state;

[0007] A traction structure comprising at least two traction wires distributed along the outer periphery of the catheter, the traction wires extending along the axial direction of the catheter, the distal ends of the traction wires being connected to the sleeve, the proximal ends of the traction wires extending towards the proximal end of the catheter.

[0008] As an optional technical solution, the distal ends of the traction wires are connected to the distal end of the sleeve.

[0009] As an optional technical solution, the traction structure further comprises a traction ring movably sleeved on the proximal end of the catheter along the axial direction, and the proximal ends of the traction wires are fixed to the traction ring.

[0010] As an optional technical solution, the catheter is provided with traction channels for the traction wires to pass through, and the traction channels correspond to the traction wires one by one; the traction channel comprises a channel body extending along the axial direction of the catheter, a proximal end opening communicating the proximal end of the channel body with the outside of the catheter, and a distal end opening communicating the distal end of the channel body with the outside of the catheter, the distal end opening being located on the proximal side of the inflatable body.

[0011] As an optional technical solution, the catheter comprises an inner tube and an outer tube sleeved on the outer periphery of the inner tube, the proximal end of the inflatable body is connected to the distal end of the outer tube, and the distal end of the inflatable body is connected to the distal end of the inner tube; the traction channel is arranged in the wall of the outer tube.

[0012] As an optional technical solution, the distance from the distal end opening to the proximal end of the inflatable body is not less than the axial length of the sleeve; and / or, the tubular interventional member further comprises a catheter seat connected to the proximal end of the catheter, and the distance from the proximal end opening to the catheter seat is not less than the axial length of the inflatable body.

[0013] As an optional technical solution, the traction wires are uniformly distributed along the outer periphery of the catheter; and / or, the traction structure comprises 2-5 traction wires.

[0014] As an optional technical solution, the traction wire is a circular traction wire, and the diameter of the traction wire is less than the wall thickness of the sleeve; or, the traction wire is a non-circular traction wire, and the thickness of the traction wire is less than the wall thickness of the sleeve.

[0015] As an optional technical solution, the sleeve is in a mesh shape; and / or, the sleeve comprises a plurality of sleeve ring portions arranged along the axial direction of the catheter at intervals, and connecting portions connecting adjacent sleeve ring portions.

[0016] As an optional technical solution, the distal end of the sleeve has a first developing part, and the position corresponding to the distal end of the inflatable body of the catheter has a second developing part; the width of the second developing part is greater than the width of the first developing part along the axial direction of the catheter.

[0017] Compared with the prior art, the tubular interventional member in the utility model, by setting the traction structure to drive the sleeve to move along the axial direction of the catheter, the length of the inflatable body being compressed in the sleeve can be adjusted, so that the axial working length of the inflatable body can be adjusted according to the length of the lesion position; meanwhile, the traction structure is set as a plurality of traction wires distributed along the outer periphery of the catheter at intervals, in the process of pushing the inflatable body, the relative position of the sleeve and the inflatable body remains unchanged, one of the traction wires can be pulled to the proximal end to drive the sleeve to bend, so that the inflatable body is more likely to pass through the tortuous blood vessels in the process of pushing. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Partially cutaway view of the tubular interventional member in the utility model (the entire adjusting assembly is located on the proximal end side of the inflatable body);

[0019] Figure 2 Partially cutaway view of the tubular interventional member in the utility model (the entire adjusting assembly is located on the proximal end side of the inflatable body); Figure 1 Partially cutaway view of the tubular interventional member in the utility model (the entire adjusting assembly is located on the proximal end side of the inflatable body);

[0020] Figure 3 Partially cutaway view of the tubular interventional member in the utility model (the entire adjusting assembly is located on the proximal end side of the inflatable body); Figure 1 Partially cutaway view of the tubular interventional member in the utility model (the entire adjusting assembly is located on the proximal end side of the inflatable body);

[0021] Figure 4 Partially cutaway view of the tubular interventional member in the utility model (the entire adjusting assembly is located on the proximal end side of the inflatable body); Figure 1 Partially cutaway view of the tubular interventional member in the utility model (the entire adjusting assembly is located on the proximal end side of the inflatable body);

[0022] Figure 5 Partially cutaway view of the tubular interventional member in the utility model (the entire adjusting assembly is located on the proximal end side of the inflatable body); Figure 4 Partially cutaway view of the tubular interventional member in the utility model (the entire adjusting assembly is located on the proximal end side of the inflatable body);

[0023] Figure 6 Partially cutaway view of the tubular interventional member in the utility model (the entire adjusting assembly is located on the proximal end side of the inflatable body); Figure 4 Partially cutaway view of the tubular interventional member in the utility model (the entire adjusting assembly is located on the proximal end side of the inflatable body);

[0024] Figure 7 Partially cutaway view of the tubular interventional member in the utility model (the entire adjusting assembly is located on the proximal end side of the inflatable body); DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model will be further described in detail below by combining with specific embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0026] The terms used to describe position and direction in this utility model are all based on the operator of the instrument, with the end closer to the operator being the proximal end and the end farther away from the operator being the distal end.

[0027] Please refer to Figure 1 As shown, this utility model provides a tubular interventional component 10, including a catheter 1, a catheter seat 2 connected to the proximal end of the catheter 1, an expandable body 3 sleeved and fixedly connected to the distal end of the catheter 1, and an adjustment assembly 4 for adjusting the axial working length of the expandable body 3. The catheter 1 has an inflation / deflation channel 11 communicating with the expandable body 3, and the catheter seat 2 has an inflation / deflation port 21 communicating with the inflation / deflation channel 11. After the tubular interventional component 10 is inserted until the expandable body 3 is located at the lesion site, the axial working length of the expandable body 3 is adjusted by the adjustment assembly 4 according to the length of the lesion site. Then, a pressurized medium is filled into the inflation / deflation channel 11 through the inflation / deflation port 21, causing the expandable body 3 located outside the adjustment assembly 4 to expand radially in a self-compressed state. After expansion is complete, the pressure is released to the expandable body 3 through the pressure relief port 21, so that the expandable body 3 switches to a compressed state, reducing the outer diameter of the expandable body 3, so as to facilitate the retraction of the tubular intervention component 10 and its secondary passage through narrow parts.

[0028] In one specific embodiment, the expandable body 3 is a balloon, and its material is at least one of nylon, Pebax, and TPU. The pressurizing medium includes, but is not limited to, gas and liquid.

[0029] Combination Figures 1-6 As shown, in one specific embodiment, the adjusting assembly 4 includes a sleeve 41 movably fitted around the outer periphery of the conduit 1 along its axial direction, and a traction structure 42 for driving the sleeve 41 to move along the axial direction of the conduit 1. The inner diameter of the sleeve 41 is larger than the outer diameter of the expandable body 3 in its compressed state, and the inner diameter of the sleeve 41 is smaller than the outer diameter of the expandable body 3 in its expanded state. The radial stiffness of the sleeve 41 is set to limit the radial expansion of the expandable body 3 within the sleeve 41 from its self-compressed state. The traction structure 42 includes at least two traction wires 421 spaced apart along the outer periphery of the conduit 1. The traction wires 421 extend along the axial direction of the conduit 1, with the distal end of the traction wire 421 connected to the sleeve 41 and the proximal end of the traction wire 421 extending towards the proximal end of the conduit 1. Figure 1 As shown, when the entire assembly 41 is located on the proximal side of the expandable body 3, the entire expandable body 3 is exposed. At this time, the axial working length of the expandable body 3 is the length of the entire expandable body 3. Figure 2As shown, when the kit 41 moves distally, the length of the inflatable body 3 compressed in the kit 41 is increased, and the axial working length of the inflatable body 3 is reduced; when the kit 41 moves proximally, the part of the inflatable body 3 in the kit 41 is released, that is, the length of the inflatable body 3 compressed in the kit 41 is reduced, and the axial working length of the inflatable body 3 is increased. In this way, the traction structure 42 can avoid affecting the radial expansion of the inflatable body 3.

[0030] In the utility model, on the one hand, the traction structure 42 drives the kit 41 to move along the axial direction of the catheter 1, the length of the inflatable body 3 compressed in the kit 41 can be adjusted, the axial working length of the inflatable body 3 can be adjusted according to the length of the lesion position, the processing mode of "one ball and one mold" of the inflatable body 3 can be improved, for the inflatable body 3 of the same diameter, only one longest mold length is needed; at the same time, during the process of conveying the inflatable body 3 to the lesion position or withdrawing, the kit 41 is sleeved on the entire compressed part of the inflatable body 3, the compressed state of the inflatable body 3 can be maintained, which is beneficial to the conveying of the inflatable body 3; and after the inflatable body 3 is filled and pressure released, the kit 41 can be moved distally, the wings of the inflatable body 3 can be completely returned to the initial folded and wound state with the assistance of the kit 41, so that the inflatable body 3 is in the initial compressed state, which is beneficial to the withdrawal of the tubular interventional member 10, the second pass through the narrow part and the like; on the other hand, the traction structure 42 is provided as a plurality of traction wires 421 distributed along the outer periphery of the catheter 1 at intervals, during the process of pushing the inflatable body 3, the relative position between the kit 41 and the inflatable body 3 is kept unchanged, one of the traction wires 421 can be pulled proximally to drive the kit 41 to bend, so that the inflatable body 3 is more likely to pass through the tortuous blood vessels during the pushing process.

[0031] Specifically, the axial length of the kit 41 is adapted to the axial overall length of the inflatable body 3, preferably, the axial length of the kit 41 is the same as the axial overall length of the inflatable body 3, so that the working length of the inflatable body 3 can be adjusted arbitrarily by the kit 41.

[0032] In combination Figure 4 As shown, the inflatable body 3 includes two connection ends 31 connected with the catheter 1, a main body part 32, and two shoulder parts 33 connecting the two ends of the main body part 32 with the corresponding connection ends 31, and the shoulder parts 33 gradually converge from the main body part 32 to the connection ends 31. The entire compressed part of the inflatable body 3 includes the main body part 32 and the two shoulder parts 33.

[0033] Specifically, the inner diameter of the sleeve 41 is only required to be set to be slightly larger than the outer diameter of the inflatable body 3 in the compressed state, such as 0.01mm-0.02mm. The inflatable body 3 located in the sleeve 41 is tightly attached to the inner wall of the sleeve 41 under the action of its own radial outward expansion tendency or under the action of the pressurized medium, which can limit the relative movement of the sleeve 41 and the inflatable body 3 in the axial direction and improve the stability of the sleeve 41.

[0034] In a specific embodiment, the sleeve 41 is a nickel-titanium alloy sleeve 41 or a stainless steel sleeve 41, so that the sleeve 41 has sufficient radial stiffness and is not easily deformed in the radial direction under the pressure of the radial outward expansion of the inflatable body 3, which can limit the radial expansion of the inflatable body 3 from the compressed state.

[0035] Further, the sleeve 41 is in a mesh shape, so that the sleeve 41 has small bending stiffness in the axial direction and high flexibility, which can adapt to the bending of the blood vessel.

[0036] In a specific embodiment, the sleeve 41 includes a plurality of sleeve ring portions 411 arranged at intervals in the axial direction of the catheter 1, and connecting portions 412 connecting adjacent sleeve ring portions 411. The plurality of sleeve ring portions 411 can be connected together by a plurality of connecting wires arranged at intervals in the circumferential direction, and at this time, the connecting wire portion between the two adjacent sleeve ring portions 411 forms the connecting portion 412, and the connecting wire and the sleeve ring can be fixed together by gluing or welding. Of course, this is not limited, and in other embodiments, the sleeve 41 can also be a sleeve 41 with a preset cutting pattern or a braided sleeve, as long as the sleeve 41 has small bending stiffness in the axial direction and high flexibility, and the radial stiffness of the sleeve 41 can limit the radial expansion of the inflatable body 3 from the compressed state.

[0037] In some optional embodiments, the interval distance between adjacent sleeve ring portions 411 is 3mm-5mm, so as to ensure the axial flexibility of the entire sleeve 41 and facilitate delivery.

[0038] Further, the distal end of the sheath 41 has a first visualization part 413, and the position of the catheter 1 corresponding to the distal end of the inflatable body 3 has a second visualization part 12. The width of the second visualization part 12 is greater than the width of the first visualization part 413 along the axial direction of the catheter 1. Through the second visualization part 12, the medical staff can know the position of the inflatable body 3, and through the first visualization part 413, the medical staff can know the position of the sheath 41. During the pushing process of the inflatable body 3, the sheath 41 is sleeved on the entire compressed part of the inflatable body 3, at this time, the first visualization part 413 and the second visualization part 12 partially coincide, by setting the width of the second visualization part 12 to be greater than the width of the first visualization part 413, so that the first visualization part 413 located at the outer periphery of the second visualization part 12 does not completely block the second visualization part 12, which is easy to distinguish, so that the medical staff can know the distal end position of the inflatable body 3 and the distal end position of the sheath 41 at the same time. After the distal end (second visualization part 12) of the inflatable body 3 coincides with the distal end of the lesion position, the position of the catheter 1 is fixed so that the position of the inflatable body 3 is fixed, and then the traction structure 42 is pulled proximally to drive the sheath 41 to move proximally, and after the distal end (first visualization part 413) of the sheath 41 coincides with the proximal end of the lesion position, the adjustment is completed, at this time, the axial working length of the inflatable body 3 is equivalent to the length of the lesion position, and when the inflatable body 3 expands radially outward, only the part of the inflatable body 3 located outside the distal end of the sheath 41 will expand radially outward, and the part of the inflatable body 3 located inside the sheath 41 will not expand outward, so as to avoid expanding the normal blood vessels, thereby improving the safety performance of the tubular interventional member 10.

[0039] In the embodiment in which the sheath 41 includes a plurality of collar parts 411 arranged at intervals along the axial direction of the catheter 1, the most distal one of the collar parts 411 can be set as the first visualization part 413, for example, a visualization coating is applied to the outer periphery of the most distal one of the collar parts 411, or the most distal one of the collar parts 411 is set as a visualization ring of platinum-iridium alloy.

[0040] Specifically, the second visualization part 12 is a visualization ring arranged in the catheter 1 inside the inflatable body 3 and close to / aligned with the distal end shoulder 33 of the inflatable body 3, and the visualization ring can also be set as a visualization ring of platinum-iridium alloy.

[0041] In one embodiment, the catheter 1 comprises an inner tube 13, an outer tube 14 sleeved on the outer periphery of the inner tube 13, the proximal end of the inflatable body 3 is connected to the distal end of the outer tube 14, and the distal end of the inflatable body 3 is connected to the distal end of the inner tube 13. At this time, the second developing part 12 is a developing ring arranged at the position close to / aligned with the distal end shoulder 33 of the inflatable body 3. Of course, this is not limited.

[0042] It can be seen that, in the embodiment in which the catheter 1 comprises an inner tube 13 and an outer tube 14 sleeved on the outer periphery of the inner tube 13, the gap between the inner tube 13 and the outer tube 14 forms the pressure charging and discharging channel 11. Of course, this is not limited, and in other embodiments, the catheter 1 can also be only one catheter 1, and the pressure charging and discharging channel 11 is formed in the tube wall of the catheter 1.

[0043] Further, the traction structure 42 comprises 2-5 traction wires 421, so as to avoid that too many traction wires 421 affect the flexibility of the entire tubular interventional member 10.

[0044] Further, the traction wires 421 are uniformly distributed along the outer periphery of the catheter 1. In one embodiment, the traction structure 42 comprises three traction wires 421 uniformly distributed along the outer periphery of the catheter 1. Of course, this is not limited.

[0045] Further, along the radial direction of the catheter 1, the width of the traction wire 421 is smaller than the wall thickness of the sleeve 41, so as to avoid that the traction wire 421 affects the flexibility of the catheter 1. In the embodiment in which the traction wire 421 is a circular traction wire 421, the diameter of the traction wire 421 is smaller than the wall thickness of the sleeve 41. In the embodiment in which the traction wire 421 is a non-circular traction wire 421, the thickness of the traction wire 421 is smaller than the wall thickness of the sleeve 41.

[0046] In combination Figure 7 As shown, in a preferred embodiment, the distal end of the traction wire 421 in the adjusting assembly 4a is connected to the distal end of the sleeve 41, so that it is easier to bend the sleeve 41 by pulling one traction wire 421 towards the proximal end. Of course, this is not limited, and in other embodiments, as shown, Figure 3 The distal end of the traction wire 421 can also be connected to the proximal end of the sleeve 41.

[0047] Specifically, the traction wire 421 and the sleeve 41 can be fixedly connected through welding, so as to improve the stability of the connection between the sleeve 41 and the traction wire 421, and further improve the stability of the traction structure 42.

[0048] Further, in combinationFigures 4-6 As shown, the tube wall of the catheter 1 is provided with a traction channel 141 through which the traction wire 421 passes, and the traction channel 141 corresponds to the traction wire 421 one by one; the traction channel 141 includes a channel body 1411 extending in the axial direction of the catheter 1, a proximal end opening 1412 communicating the proximal end of the channel body 1411 with the outside of the catheter 1, and a distal end opening 1413 communicating the distal end of the channel body 1411 with the outside of the catheter 1, and the distal end opening 1413 is located on the proximal side of the inflatable body 3. The proximal end of the traction wire 421 enters the channel body 1411 through the distal end opening 1413 and exits from the proximal end opening 1412, so that the medical staff can operate the traction wire 421 from the proximal end of the tubular interventional member 10; at the same time, by providing the traction channel 141, the length of the traction wire 421 exposed in the blood vessel can be reduced, and the safety performance of the tubular interventional member 10 can be improved.

[0049] In the embodiment in which the catheter 1 includes an inner tube 13 and an outer tube 14 sleeved on the outer periphery of the inner tube 13, the traction channel 141 is arranged at the tube wall of the outer tube 14.

[0050] Specifically, the distance from the distal end opening 1413 to the proximal end of the inflatable body 3 is not less than the axial length of the sleeve 41. The path range of the proximal movement of the sleeve 41 is avoided from being affected by the distal end opening 1413, and the adjustment range of the axial working length of the inflatable body 3 is increased.

[0051] In a specific embodiment, the traction structure 42 further includes a pulling ring 422 movably sleeved on the proximal end of the catheter 1 in the axial direction, and the proximal end of the traction wire 421 is fixed to the pulling ring 422. That is, the proximal end of the traction wire 421 is connected to the pulling ring 422 after exiting from the proximal end opening 1412. By moving the pulling ring 422 in the axial direction of the catheter 1, the at least two traction wires 421 can be driven to move synchronously, and the synchronous regulation and control of all the traction wires 421 can be facilitated.

[0052] Specifically, the distance from the proximal end opening 1412 to the catheter seat 2 is not less than the axial length of the inflatable body 3. The interference between the pulling ring 422 and the catheter seat 2 can be avoided, and the axial movement range of the sleeve 41 can be affected.

[0053] Specifically, the pulling ring 422 can be a high polymer tube, and the material thereof can be pebax, pc, nylon, etc. The pulling ring 422 and the traction wire 421 can be fixed together by welding or gluing.

[0054] In summary, the tubular intervention component 10 in the utility model, through setting up traction structure 42 drive set 41 along the axial movement of the catheter 1, can adjust the length of the inflatable body 3 is pressed in the set 41, thereby realizing the length adjustment of the axial working length of the inflatable body 3 according to the lesion position, while the traction structure 42 is set to multiple traction wires 421 along the interval distribution of the outer periphery of the catheter 1, in the process of inflatable body 3 push, under the condition that the relative position of set 41 and inflatable body 3 is kept unchanged, can be bent by pulling one of the traction wires 421 to the proximal end, drive set 41 bending, have the function of adjusting bending, so that the inflatable body 3 is more easily traversed in the process of pushing the tortuous blood vessels.

[0055] The utility model has been described by the above related embodiment, however the above embodiment is only the example of implementation of the utility model. In addition, the technical features involved in the different embodiments of the utility model described above can be combined with each other as long as they do not conflict with each other. It must be pointed out that the utility model can also have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the utility model without departing from the spirit and essence of the utility model. However, these corresponding changes and modifications should all belong to the protection scope of the claims attached to the utility model.

Claims

1. A tubular interventional member comprising a catheter, an inflatable body sheathed and fixedly connected to a distal end of the catheter, the inflatable body having a compressed state, an inflated state; characterized in that: The tubular interventional assembly further comprises an adjusting assembly for adjusting the axial working length of the inflatable body, the adjusting assembly comprising: a sleeve set movably along the axial direction of the catheter around the outer periphery of the catheter, the inner diameter of the sleeve being greater than the outer diameter of the inflatable body in the compressed state and being smaller than the outer diameter of the inflatable body in the expanded state, the radial stiffness of the sleeve being configured to limit the radial expansion of the inflatable body located in the sleeve from the compressed state; a traction structure comprising at least two traction wires distributed along the outer periphery of the catheter, the traction wires extending along the axial direction of the catheter, the distal ends of the traction wires being connected to the sleeve, the proximal ends of the traction wires extending towards the proximal end of the catheter.

2. The tubular interventional member of claim 1, wherein: The distal ends of the traction wires are connected to the distal end of the sleeve.

3. The tubular interventional member of claim 1, wherein: The traction structure further comprises a traction ring movably set along the axial direction around the proximal end of the catheter, the proximal ends of the traction wires being fixed to the traction ring.

4. The tubular interventional member of claim 1, wherein: The catheter is provided with traction channels for the traction wires to pass through, the traction channels corresponding to the traction wires one by one; the traction channel comprises a channel body extending along the axial direction of the catheter, a proximal end opening communicating the proximal end of the channel body with the outside of the catheter, and a distal end opening communicating the distal end of the channel body with the outside of the catheter, the distal end opening being located on the proximal side of the inflatable body.

5. The tubular interventional member of claim 4, wherein: The catheter comprises an inner tube and an outer tube set around the outer periphery of the inner tube, the proximal end of the inflatable body being connected to the distal end of the outer tube, and the distal end of the inflatable body being connected to the distal end of the inner tube; the traction channel is provided in the tube wall of the outer tube.

6. The tubular interventional member of claim 4, wherein: The distance from the distal end opening to the proximal end of the inflatable body is not less than the axial length of the sleeve; and / or, the tubular interventional member further comprises a catheter seat connected to the proximal end of the catheter, the distance from the proximal end opening to the catheter seat being not less than the axial length of the inflatable body.

7. The tubular interventional member of claim 1, wherein: The traction wires are uniformly distributed along the outer periphery of the catheter; and / or, the traction structure comprises 2-5 traction wires.

8. The tubular interventional member of claim 1, wherein: The traction wires are circular traction wires, the diameter of the traction wires being smaller than the wall thickness of the sleeve; or, the traction wires are non-circular traction wires, the thickness of the traction wires being smaller than the wall thickness of the sleeve.

9. The tubular interventional member of claim 1, wherein: The sleeve is in a mesh shape; and / or, the sleeve comprises a plurality of sleeve ring portions arranged along the axial direction of the catheter at intervals, and connecting portions connecting adjacent sleeve ring portions.

10. The tubular interventional member of claim 1, wherein: The distal end of the sleeve has a first developing portion, and the position of the catheter corresponding to the distal end of the inflatable body has a second developing portion; along the axial direction of the catheter, the width of the second developing portion is greater than the width of the first developing portion.

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