Conveying device and stent conveying system thereof
By designing a conveying device for narrow parts of the natural cavity, using the combination of inner tube, outer tube, puncture tip and safety rope, the problem of inaccurate positioning and early fall off in the stent placement process in the prior art is solved, and a higher implant success rate and use value are achieved.
Patent Information
- Application Number
- CN202420645397.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-03-29
AI Technical Summary
In the prior art, the bracket conveying system used in narrow parts of the natural cavity has the problem that the snap structure is easy to slip and difficult to process, resulting in inaccurate positioning of the bracket insertion process or the bracket falls off early.
A conveying device including an inner tube, an outer tube, a puncture tip and a safety rope is designed. The inner diameter of the puncture tip and the metal bracket are expanded by inserting the safety rope into the inner tube, ensuring a stable abutment between the puncture tip and the metal bracket, and deformation and expansion to fix it in the cavity when the metal bracket reaches a preset temperature.
It improves the success rate of implantation of metal stents in narrow parts of natural cavity channels, ensures that the stent is positioned accurately and is not easy to fall off early, and reduces the processing difficulty and use value of the system.
Smart Images
Figure CN222657272U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical equipment, and more specifically, to a delivery device and a stent delivery system comprising the delivery device. Background Art
[0002] Natural cavity stenosis is a common disease, which is common in urethral stenosis, esophageal stenosis, etc. The cavity is generally expanded by implanting a stent. There are many ways to implant a stent, but stent detachment occurs from time to time.
[0003] The prior art discloses a prostate stent delivery system with a buckle structure, the structure of which is as follows: Figure 1 As shown, it comprises: an inner sheath tube 01 for the endoscope 04 to extend into, and an outer sheath tube 02 which is sleeved outside a partial section of the inner sheath tube 01; wherein, a snap structure is provided at one end of the inner sheath tube 01, and the snap structure comprises a plurality of barb-shaped protrusions 03 which are made of elastic material and extend outward; a partial section of the inner sheath tube 01 close to the snap structure is not covered by the outer sheath tube 02, and the uncovered section is used for sleeved prostate stent; in the use state, after the endoscope 04 is extended into the inner sheath tube 01, the endoscope 04 can push the barb-shaped protrusions 03 outward, and the pushed barb-shaped protrusions 03 can hook the prostate stent, and the prostate stent is stuck between the outer sheath tube 02 and the barb-shaped protrusions 03; after the delivery of the prostate stent is completed, when the endoscope 04 is withdrawn, the barb-shaped protrusions 03 can rebound and separate from the prostate stent.
[0004] However, the snap-fit structure is prone to thread slippage and is difficult to process, resulting in a low use value of the prostate stent delivery system with the snap-fit structure.
[0005] In summary, how to provide a device that is suitable for the narrow part of the natural cavity and can accurately position the stent during implantation, or prevent the stent from falling off prematurely during implantation, is an urgent problem to be solved by those skilled in the art. Utility Model Content
[0006] In view of this, the purpose of the utility model is to provide a delivery device, which is suitable for the narrow part of the natural cavity and can accurately position the metal stent during the implantation process, or prevent the metal stent from falling off prematurely during the implantation process, so as to effectively improve the success rate of metal stent implantation.
[0007] Another object of the utility model is to provide a stent delivery system comprising the above delivery device.
[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0009] A conveying device, comprising:
[0010] Internal pipe joint;
[0011] an outer pipe joint, an end of which is connected to an end of the inner pipe joint;
[0012] an outer tube, one end of which is connected to the outer tube joint;
[0013] An inner tube, one end of which is connected to the inner tube joint, the other end of which is provided with a puncture tip, and the outer tube is sleeved on the outer wall of the inner tube;
[0014] A metal stent, which passes through the puncture tip and is sleeved on the outer wall of the inner tube, one end of the metal stent abuts against the outer tube, and the metal stent is used to deform and expand when a preset temperature is reached to prop up the upper end of the narrow part of the natural cavity;
[0015] The safety rope is used to be inserted into the inner tube to expand the inner diameter of the inner tube so that the puncture tip and the other end of the metal stent are butted against each other.
[0016] In one embodiment, the metal support comprises a nickel-titanium memory alloy material.
[0017] In one embodiment, the puncture tip is an arrow-shaped structure, a through hole is provided at the center of the arrow-shaped structure, and the safety rope is inserted into the through hole.
[0018] In one embodiment, the inner diameter of the metal stent is greater than or equal to the maximum outer diameter of the puncture tip.
[0019] In one embodiment, the safety rope is provided with an expansion section, the outer diameter of the expansion section is larger than the inner diameter of the inner tube, so that the inner tube can be expanded when the safety rope is inserted into the inner tube.
[0020] In one embodiment, the inner pipe joint and the outer pipe joint are threadedly connected.
[0021] In one embodiment, the inner tube, the inner tube joint, the outer tube joint and the outer tube are all made of plastic.
[0022] In one embodiment, the inner tube and the inner tube joint are an integral structure, and the outer tube joint and the outer tube are an integral structure.
[0023] A stent delivery system comprises any one of the delivery devices described above.
[0024] When using the delivery device provided by the utility model, before implanting the metal stent into the human body, if the inner tube and the inner tube joint, the outer tube and the outer tube joint are detachable structures, the outer tube can be sleeved on the outer wall of the inner tube, and then the metal stent can be pierced through the outer wall of the inner tube through the puncture tip, so that one end of the metal stent abuts against the end of the outer tube. Then, the outer tube joint is connected to the end of the outer tube, the inner tube joint is connected to the end of the inner tube, and the inner tube joint is tightly connected to the outer tube joint to complete the assembly operation of the device.
[0025] If the inner tube and the inner tube joint, the outer tube and the outer tube joint are an integrated structure, the inner tube can be inserted into the outer tube, and the inner tube joint and the outer tube joint can be connected and fixed. After that, the metal bracket is passed through the puncture tip to the outer wall of the inner tube, so that one end of the metal bracket abuts against the end of the outer tube to complete the assembly operation of the device.
[0026] Afterwards, the safety rope can be inserted into the inner tube, and the safety rope can expand the inner diameter of the inner tube, so that the maximum outer diameter of the puncture tip becomes larger, so that the puncture tip and the other end of the metal stent abut against each other. That is, during the process of inserting the safety rope into the inner tube, the inner diameter of the inner tube becomes larger due to the squeezing of the safety rope, and the head end of the inner tube (i.e., the puncture tip) expands, so that the metal stent is abutted by the puncture tip and the end of the outer tube, so that the metal stent will not fall off easily. Then, the inner tube can be pushed to move to the narrow part of the natural cavity, so as to move the metal stent to the narrow part of the natural cavity.
[0027] Afterwards, the safety rope can be pulled outward from the inner tube, so that the puncture tip of the inner tube can restore its shape. Afterwards, the operator can inject a higher temperature physiological saline into the inner tube joint through a syringe. The higher temperature physiological saline can increase the temperature of the inner tube, and then transfer heat to the metal stent, so that the metal stent reaches the required preset temperature and then deforms and expands, that is, the end of the metal stent can expand and expand, which is convenient for the inner tube and the puncture tip to separate from the metal stent, and can make the metal stent stuck at the upper end of the natural cavity stenosis, so as to prevent the natural cavity stenosis from continuing to shrink. Finally, after the expansion and deformation of the metal stent is completed, the inner tube joint and the outer tube joint can be loosened, and the inner tube and the outer tube can be withdrawn from the body respectively, so that only the expanded and deformed metal stent is stuck at the upper end of the natural cavity stenosis, so as to effectively prevent the natural cavity stenosis from continuing to shrink.
[0028] In summary, the delivery device provided by the utility model is suitable for narrow areas of natural cavities and can accurately position the metal stent during implantation, or can prevent the metal stent from falling off prematurely during implantation, thereby effectively improving the success rate of metal stent implantation.
[0029] In addition, the utility model also provides a stent delivery system including the above delivery device. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0031] Figure 1 It is a structural schematic diagram of a prostate stent delivery system with a buckle structure in the prior art;
[0032] Figure 2 It is a schematic diagram of the structure of the metal stent at room temperature and in an unreleased state;
[0033] Figure 3 It is a schematic diagram of the structure of the metal stent in the state of temperature rise and release;
[0034] Figure 4 It is a structural schematic diagram of the conveying device;
[0035] Figure 5 is a schematic diagram of the structure of a safety rope;
[0036] Figure 6 This is a schematic diagram of the structure when the safety rope is inserted into the inner tube;
[0037] Figure 7 A schematic diagram of the structure of the delivery device inserted into a narrow part of a natural cavity;
[0038] Figure 8 A schematic diagram of the structure of withdrawing the safety rope after the delivery device is inserted into the narrow part of the natural cavity;
[0039] Fig. 9 A schematic diagram of a structure in which water is injected into the inner pipe joint through a syringe to deform the metal bracket;
[0040] Fig.10 This is a schematic diagram of the structure of a metal stent stuck in a narrow part of a natural cavity.
[0041] Reference numerals:
[0042] 01-inner sheath; 02-outer sheath; 03-barbed protrusion; 04-endoscope;
[0043] 1-inner tube joint; 2-outer tube joint; 3-outer tube; 4-metal bracket; 5-inner tube; 51-puncture tip;
[0044] 6-safety rope; 61-expansion section; 7-syringe; L-stenosis of natural cavity. DETAILED DESCRIPTION
[0045] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0046] The core of the utility model is to provide a delivery device, which is suitable for natural cavity stenosis and can accurately position the metal stent during implantation, or prevent the metal stent from falling off prematurely during implantation, so as to effectively improve the implantation success rate of the metal stent. Another core of the utility model is to provide a stent delivery system including the above delivery device.
[0047] Please refer to Figures 2 to 10 .
[0048] This specific embodiment provides a conveying device, including:
[0049] Internal pipe joint 1;
[0050] An outer pipe joint 2, an end of which is connected to an end of the inner pipe joint 1;
[0051] An outer tube 3, one end of which is connected to the outer tube joint 2;
[0052] The inner tube 5 has one end connected to the inner tube joint 1, and the other end of the inner tube 5 is provided with a puncture tip 51, and the outer tube 3 is sleeved on the outer wall of the inner tube 5;
[0053] The metal stent 4 passes through the puncture tip 51 and is sleeved on the outer wall of the inner tube 5. One end of the metal stent 4 abuts against the outer tube 3. The metal stent 4 is used to deform and expand when a preset temperature is reached to open the upper end of the narrow part of the natural cavity;
[0054] The safety rope 6 is used to be inserted into the inner tube 5 to expand the inner diameter of the inner tube 5 so that the puncture tip 51 and the other end of the metal stent 4 are butted against each other.
[0055] It should be noted that the metal stent 4 is used to deform when reaching a preset temperature, which may mean that the metal stent 4 is not released at room temperature and is distributed in a spiral column shape. When the metal stent 4 reaches a preset position (the upper end of the natural cavity stenosis), the metal stent 4 is heated to a preset temperature, and the metal stent 4 at this time can deform and expand, and the deformation expansion area can open the upper end of the natural cavity stenosis to prevent the natural cavity stenosis from further narrowing. For example, the end of the metal stent 4 can expand and be distributed in a flashlight shape.
[0056] It should also be noted that the outer diameter of the inner tube 5 is smaller than the maximum outer diameter of the puncture tip 51, and the inner diameter of the metal stent 4 is slightly larger than or equal to the maximum outer diameter of the puncture tip 51, so that the metal stent 4 can be sleeved on the outer wall of the inner tube 5 through the puncture tip 51. In addition, the inner tube 5 and the puncture tip 51 can be made of medical plastic material (deformed under force), so that the metal stent 4 can be smoothly inserted from the puncture tip 51 of the inner tube 5 to the outer periphery of the inner tube 5. When the safety rope 6 is inserted into the inner tube 5, the inner tube 5 and the puncture tip 51 can be expanded, and the maximum outer diameter of the expanded puncture tip 51 is larger than the outer diameter of the undeformed metal stent 4, so that the end of the metal stent 4 is abutted by the puncture tip 51. In actual use, the shape, structure, size, material, position, etc. of the inner tube joint 1, the outer tube joint 2, the outer tube 3, the inner tube 5, the metal stent 4 and the safety rope 6 can be determined according to actual conditions and actual needs.
[0057] When using the delivery device provided by the utility model, before implanting the metal stent 4 into the human body, if the inner tube 5 and the inner tube joint 1, the outer tube 3 and the outer tube joint 2 are detachable structures, the outer tube 3 can be sleeved on the outer wall of the inner tube 5, and then the metal stent 4 is pierced through the outer wall of the inner tube 5 through the puncture tip 51, so that one end of the metal stent 4 abuts against the end of the outer tube 3. Then, the outer tube joint 2 is connected to the end of the outer tube 3, the inner tube joint 1 is connected to the end of the inner tube 5, and the inner tube joint 1 is tightly connected to the outer tube joint 2 to complete the assembly operation of the device.
[0058] If the inner tube 5 and the inner tube joint 1, the outer tube 3 and the outer tube joint 2 are an integrated structure, the inner tube 5 can be inserted into the outer tube 3, and the inner tube joint 1 and the outer tube joint 2 can be connected and fixed. After that, the metal bracket 4 is penetrated through the outer wall of the inner tube 5 through the puncture tip 51, so that one end of the metal bracket 4 is abutted against the end of the outer tube 3 to complete the assembly operation of the device.
[0059] After that, the safety rope can be inserted into the inner tube, and the safety rope 6 can expand the inner diameter of the inner tube 5, so that the maximum outer diameter of the puncture tip 51 becomes larger, so that the puncture tip 51 and the other end of the metal stent 4 abut against each other. That is, during the process of inserting the safety rope into the inner tube, the inner diameter of the inner tube becomes larger due to the squeezing of the safety rope 6, and the head end of the inner tube (i.e., the puncture tip) expands, so that the metal stent is abutted by the puncture tip and the end of the outer tube, so that the metal stent will not fall off easily. Then, the inner tube can be pushed to move to the narrow part of the natural cavity, so as to move the metal stent to the narrow part of the natural cavity.
[0060] Then, the safety rope 6 can be pulled outward from the inner tube 5, so that the puncture tip 51 of the inner tube 5 recovers its shape. Figure 8 Then, the operator can inject a relatively high temperature physiological saline solution into the inner pipe joint 1 through the syringe 7. Fig. 9As shown, the higher temperature physiological saline can increase the temperature of the inner tube 5, and then transfer heat to the metal stent 4, so that the metal stent 4 reaches the desired preset temperature and then deforms and expands, that is, the end of the metal stent 4 can expand and expand, which not only facilitates the separation of the inner tube 5 and the puncture tip 51 from the metal stent 4, but also allows the expanded metal stent 4 to effectively open the upper end of the natural cavity stenosis L, thereby preventing the natural cavity stenosis L from further shrinking. Finally, after the expansion and deformation of the metal stent 4 is completed, the inner tube joint 1 and the outer tube joint 2 can be loosened, and the inner tube 5 and the outer tube 3 can be withdrawn from the body respectively, leaving only the expanded and deformed metal stent 4 stuck at the upper end of the natural cavity stenosis L, thereby effectively preventing the natural cavity stenosis L from further shrinking. The structure is shown in FIG. Fig.10 shown.
[0061] In summary, the delivery device provided by the utility model is suitable for narrow areas of natural cavities and can accurately position the metal stent during implantation, or can prevent the metal stent from falling off prematurely during implantation, thereby effectively improving the success rate of metal stent implantation.
[0062] In one embodiment, the metal support 4 comprises a nickel-titanium memory alloy. Figure 2 Schematic diagram of the structure of the metal stent 4 at room temperature and in an unreleased state. After the metal stent 4 is implanted in the human body, a 55°C saline solution can be injected into the inner pipe joint 1 through a syringe 7 to heat the metal stent 4 to a preset temperature and deform (the end of the metal stent 4 expands). Figure 3 It is a structural schematic diagram of the metal support 4 in the state of temperature rise and release.
[0063] It should be noted that the deformation of the nickel-titanium memory alloy material parts at different preset temperatures is different, so the preset temperature and preset deformation of the nickel-titanium memory alloy material parts can be set according to actual conditions and actual needs, but it is necessary to ensure that the deformed metal stent 4 can expand the narrow part of the natural cavity and separate from the inner tube 5.
[0064] In one embodiment, the puncture tip 51 is an arrow-shaped structure, a through hole is provided at the center of the arrow-shaped structure, and the safety rope 6 is inserted into the through hole.
[0065] It should be noted that the puncture tip 51 is provided with an arrow-shaped structure, and a through hole is provided at the center of the arrow-shaped structure, so that the safety rope 6 can be inserted into the through hole of the arrow-shaped structure. One end of the arrow-shaped structure is used for puncture, and the other end is used to abut against the end of the metal stent 4. During the process of inserting the safety rope 6 into the inner tube 5 and the puncture tip 51, the inner tube 5 and the puncture tip 51 can be expanded, so that the end of the puncture tip 51 can abut against the metal stent 4, preventing the metal stent 4 from falling off easily.
[0066] In one embodiment, the inner diameter of the metal stent 4 is greater than or equal to the maximum outer diameter of the puncture tip 51 .
[0067] It should be noted that the puncture tip 51 with an arrow-shaped distribution has a better puncture effect. Since the inner diameter of the metal stent 4 is equal to the maximum outer diameter of the puncture tip 51, or the inner diameter of the metal stent 4 is greater than the maximum outer diameter of the puncture tip 51 by 0.1 mm, the operation process of the metal stent 4 being sheathed on the outer wall of the inner tube 5 is smoother. The expanded puncture tip 51 and the outer tube 3 cooperate to abut the metal stent 4 to prevent the metal stent 4 from easily detaching during movement. Moreover, after the safety rope 6 is removed, the arrow-shaped structure (puncture tip 51) of the inner tube 5 recovers its shape and no longer expands, so that the inner tube 5 and the deformed and expanded metal stent 4 are separated more smoothly, leaving only the upper end of the metal stent 4 at the narrow part of the natural cavity.
[0068] In addition, a limiting boss can be provided on the arrow-shaped puncture tip 51. After the safety rope 6 is inserted, the puncture tip 51 is expanded, so that the undeformed and expanded metal stent 4 and the limiting boss are clamped and fixed, thereby preventing the undeformed metal stent 4 from being separated from the inner tube 5. After the metal stent 4 is deformed and expanded, it can pass through the puncture tip 51, and the puncture tip 51 can be stretched and contracted under the action of the safety rope 6, so that it can pass through the expanded metal stent 4 more smoothly.
[0069] In one embodiment, the safety rope 6 is provided with an expansion section 61, the outer diameter of the expansion section 61 is larger than the inner diameter of the inner tube 5, so that the inner tube 5 can be expanded when the safety rope 6 is inserted into the inner tube 5. Figure 5 and Figure 6 It should be noted that the safety rope 6 can be placed in the inner tube 5, the outer diameter of the safety rope 6 and the inner diameter of the inner tube 5 are slightly different, the outer diameter of the expansion section 61 of the safety rope 6 is larger than the inner diameter of the inner tube 5, and during the insertion of the safety rope 6 into the inner tube 5, the inner diameter of the inner tube 5 is enlarged due to the extrusion of the expansion section 61, and the head end of the inner tube 5 (that is, the puncture tip 51) is expanded, so that the puncture tip 51 can clamp the metal stent 4 on the inner tube 5 and prevent it from falling off.
[0070] In one embodiment, the inner pipe joint 1 and the outer pipe joint 2 are threadedly connected to facilitate installation or removal of the inner pipe joint 1 and the outer pipe joint 2 .
[0071] In one embodiment, the inner tube 5, the inner tube joint 1, the outer tube joint 2 and the outer tube 3 are all made of plastic.
[0072] It should be noted that this device is mainly used in the narrow part of the natural cavity. It is composed of two major parts. One part is the metal stent 4, which is a long-term implant product. The material of the metal stent 4 is generally nickel-titanium memory alloy; the other part is the delivery system (which includes the inner tube 5, the inner tube joint 1, the outer tube joint 2 and the outer tube 3, etc.), which is used to push the metal stent 4 to be implanted and withdrawn from the human body after completion. The delivery system is a plastic product. By using this device, accurate positioning can be achieved during the implantation process, or the metal stent 4 can be prevented from falling off prematurely during the implantation process, so that the metal stent 4 can be implanted successfully. In addition, the processing difficulty of this device is relatively low, and the structural use value is relatively high.
[0073] In one embodiment, the inner tube 5 and the inner tube joint 1 are an integrated structure, wherein the inner tube 5 and the inner tube joint 1 are connected, and the inner tube 5 and the inner tube joint 1 are set as an integrated structure, which can improve the connection effect between the two and reduce the assembly steps. The outer tube joint 2 and the outer tube 3 are an integrated structure, wherein the outer tube 3 and the outer tube joint 2 are connected, and the outer tube 3 and the outer tube joint 2 are set as an integrated structure, which can improve the connection effect between the two and reduce the assembly steps.
[0074] In addition to the above-mentioned delivery device, the present invention also provides a stent delivery system including the delivery device disclosed in the above-mentioned embodiment. For the structures of other parts of the stent delivery system, please refer to the prior art and will not be described in detail herein.
[0075] In addition, it should be noted that the orientation or positional relationship indicated by "inside and outside" etc. in the present invention is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of simplifying the description and facilitating understanding, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0076] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referenced to each other. Any combination of all embodiments provided by the utility model is within the protection scope of this utility model and will not be described in detail here.
[0077] The above is a detailed introduction to the delivery device and the stent delivery system provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.
Claims
1. A conveying device, characterized in that: include: Internal pipe joint (1); An outer pipe joint (2), an end of which is connected to an end of the inner pipe joint (1); An outer tube (3), one end of which is connected to the outer tube joint (2); An inner tube (5), one end of which is connected to the inner tube joint (1), the other end of the inner tube (5) is provided with a puncture tip (51), and the outer tube (3) is sleeved on the outer wall of the inner tube (5); a metal stent (4) which passes through the puncture tip (51) and is sleeved on the outer wall of the inner tube (5), one end of the metal stent (4) being in contact with the outer tube (3), and the metal stent (4) is used to deform and expand when a preset temperature is reached so as to open the upper end of the narrow part of the natural cavity; The safety rope (6) is used to be inserted into the inner tube (5) to expand the inner diameter of the inner tube (5) so that the puncture tip (51) and the other end of the metal stent (4) are butted against each other.
2. The conveying device according to claim 1, characterized in that The metal support (4) comprises a nickel-titanium memory alloy material.
3. The conveying device according to claim 1, characterized in that: The puncture tip (51) is an arrow-shaped structure, a through hole is provided at the center of the arrow-shaped structure, and the safety rope (6) is inserted into the through hole.
4. The conveying device according to claim 1, characterized in that The inner diameter of the metal stent (4) is greater than or equal to the maximum outer diameter of the puncture tip (51).
5. The conveying device according to any one of claims 1 to 4, characterized in that: The safety rope (6) is provided with an expansion section (61), the outer diameter of the expansion section (61) being larger than the inner diameter of the inner tube (5), so as to expand the inner tube (5) when the safety rope (6) is inserted into the inner tube (5).
6. The conveying device according to any one of claims 1 to 4, characterized in that: The inner pipe joint (1) and the outer pipe joint (2) are threadedly connected.
7. The conveying device according to any one of claims 1 to 4, characterized in that: The inner tube (5), the inner tube joint (1), the outer tube joint (2) and the outer tube (3) are all made of plastic.
8. The conveying device according to claim 7, characterized in that The inner tube (5) and the inner tube joint (1) are an integrated structure, and the outer tube joint (2) and the outer tube (3) are an integrated structure.
9. A stent delivery system, characterized in that: A conveying device comprising any one of claims 1 to 8.