Conveying device for conveying self-expanding tubular implant and system comprising conveying device

Abstract

The invention relates to a delivery device for delivering a self-expanding tubular implant and a system comprising the same. The conveying device comprises a pushing rod; at least one expandable body disposed at a distal end of the push rod, the expandable body configured to: axially elongate in a radially constrained contracted state; under the expansion state of releasing the constraint, radial expansion and axial contraction are realized; the elastic core wire is arranged in the expandable body in a penetrating mode and connected with the two ends of the expandable body, and the core wire is kept in a straight line shape in the natural state and the contraction state of the expandable body. The conveying device provided by the invention can be matched with a small-size micro catheter and can provide enhanced axial pushing force in the conveying process, so that the pushing efficiency and the operation stability of the tubular implant are improved; meanwhile, the radial expansion force provided by the expandable body can form effective auxiliary support for the implant, rapid wall attachment and stable expansion of the implant are promoted, and therefore the release effect of the implant is improved.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, specifically relating to a delivery device for delivering self-expanding tubular implants and a system comprising the same. Background Technology

[0002] A stent is a tubular device implanted into a patient's vascular system via a catheter or similar delivery system to treat a variety of conditions, including stenosis (such as narrowing or occlusion of the lumen of blood vessels, bile ducts, ureters, etc.) and aneurysms (such as intracranial aneurysms, abdominal aortic aneurysms, femoral artery aneurysms, etc.). The inner diameter and configuration (such as tortuosity) of the lumen at the target implantation site are key factors affecting the difficulty and feasibility of the implantation procedure. Generally, a larger inner diameter and a relatively straight configuration make the procedure easier; while a smaller inner diameter and a highly tortuous configuration often carries a higher risk of stenosis, occlusion, or aneurysm formation.

[0003] To accommodate smaller and more tortuous lesion lumens, there is a need in the art to develop delivery systems and tubular implants that can accommodate microcatheters with smaller dimensions (e.g., inner diameter ≤ 0.021 inches). However, as the size of the target implantation environment decreases and the tortuosity increases, tubular implants may face problems of incomplete expansion or poor apposition after deployment. For tubular implants of conventional sizes (typically referring to systems that accommodate microcatheters with inner diameters greater than 0.021 inches), a feasible solution is to use delivery systems with variable radial dimensions (e.g., a binding mesh structure woven from elastic filaments or a perforated tubular bundle structure). Such systems can assist in the full expansion and effective apposition of the tubular implant through their own radial expansion after it reaches the target location.

[0004] Due to the reduction in the inner diameter of the microcatheter, the delivery system with variable radial dimensions will face the challenge of weakened axial pushing force. This makes the tubular implant prone to deformation during loading and delivery, causing fluctuations in pushing force, affecting the implantation effect of the tubular implant, and even causing medical accidents.

[0005] Therefore, developing a delivery device for a compatible small-diameter microcatheter for delivering self-expanding tubular implants, capable of adapting to the vascular environment of lesions with smaller inner diameters and higher tortuosity, without sacrificing its ability to assist in the full expansion and effective adhesion of the tubular implant, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] To address the shortcomings of existing technologies, one objective of this invention is to provide a delivery device for delivering self-expanding tubular implants, comprising: Push lever; At least one expandable body is disposed at the distal end of the push rod, the expandable body being configured to: axially elongate in a radially constrained contracted state; and radially expand and axially contract in a constrained expanded state. An elastic core wire is threaded through the expandable body and connected to its two ends. The core wire remains straight in both the natural state and the contracted state of the expandable body.

[0007] The natural state refers to the state of the core wire when it is not subjected to any external forces (such as binding, compression, stretching, etc.). The statement that "the core wire remains straight in both the natural state and the contracted state of the expandable body" means that in the natural state, the core wire is straight without being bent or pre-shaped; and when the expandable body is in a contracted state, the core wire still maintains this straight shape.

[0008] This invention provides a delivery device for delivering a self-expanding tubular implant, comprising an expandable body capable of both a contracted and an expanded state. In the contracted state, the delivery device is radially constrained (e.g., by externally fitted microcatheter), causing the expandable body to contract radially and elongate axially, with the core wire remaining straight. This structure achieves a dual effect: firstly, it concentrates the force transmitted by the expandable body at the core wire, converting it into an axial pushing force; secondly, the straight shape of the core wire itself maximizes the axial pushing force, significantly enhancing the delivery efficiency of the device in the contracted state. In the expanded state, the radial constraint is released (e.g., by removing the microcatheter), and the expandable body expands radially and contracts axially according to a predetermined shape. Initially, its expansion acts on the inner wall of the tubular implant to assist in the expansion.

[0009] In short, in the delivery device provided in this application, the core wire acts like a "spine," maximizing the convergence and axial transmission of the force of the expandable body during delivery (contraction state), thereby improving delivery efficiency. At the same time, it utilizes the radial expansion force of the expandable body after the constraint is released to assist the expansion of the tubular implant. More importantly, the core wire described in this application is in a straight line in its natural state during the contraction state of the expandable body, without bending deformation to store energy, and only undergoes adaptive bending deformation when the expandable body expands radially and contracts axially.

[0010] It should be noted that the delivery device for delivering self-expanding tubular implants provided by the present invention is not entirely limited to delivery devices for tubular implants with smaller and more tortuous lesion lumens. That is, the delivery device provided by the present invention can also be used for delivery of tubular implants of conventional size.

[0011] The expandable body described in this application is typically configured to confine the elastic core wire within the expandable body, such as a cross-woven tubular structure or a lantern-shaped radial filament binding structure with a confinement structure. The confinement structure can be connected between radial filaments using existing connection methods (such as bonding, welding, etc.), for example, an S-shaped confinement structure connected between adjacent radial filaments. In other embodiments, the expandable body can also be a carved, hollowed-out structure capable of confining the elastic core wire within the expandable body. The carved pattern typically has pillars at an angle to the axial direction to restrict the elastic core wire's position within the expandable body.

[0012] Preferably, during the transition from the contracted state to the expanded state, the change in axial contraction force of the expandable body is greater than the change in bending recovery force of the core wire.

[0013] In a preferred embodiment, during the transition from the contracted state to the expanded state, the change in axial contraction force of the expandable body is more than 5 times, for example, 6 times, 7 times, 8 times, 10 times, etc.

[0014] The change in bending restoring force of the core wire is defined as the change in force value for each unit distance shortened at both ends of the core wire; the change in axial contraction force of the expandable body is defined as the change in force value for each unit distance shortened at both ends of the expandable body. The change in force is neither positive nor negative, representing the absolute value of the force change and indicating the difference before and after the change.

[0015] When the expandable body is in an expanded state, the core wire is forced to bend and deform as it contracts axially. Since the core wire is straight in its natural state, its bent shape generates a tendency force to restore its straight shape (i.e., bending restoring force). At the same time, the expandable body, under the influence of a pre-shaped action, tends to maintain a radially expanded and axially contracted state, thereby generating a contraction force that resists axial elongation. When it is defined that "during the transition from the contracted state to the expanded state, the change in the axial contraction force of the expandable body is greater than the change in the bending restoring force of the core wire," it can be understood that during the transition from the contracted state to the expanded state, the increment of the restoring force generated by the bending deformation of the core wire is less than the increment of the contraction force of the expandable body tending towards the pre-shaped expanded state, and preferably much less than the increment of the contraction force of the expandable body tending towards the pre-shaped expanded state. That is, this mechanical relationship ensures that the bending restoring behavior of the core wire does not substantially hinder the radial expansion process of the expandable body.

[0016] Preferably, the axial length L of the expandable body in the expanded state is... 膨胀体 The length L of the core wire in its natural state 芯线 50% to 95%, for example, 55%, 60%, 64%, 69%, 76%, 83%, 88%, 92%, etc.

[0017] L 膨胀体 With L芯线 The relationship can be understood as the relationship between the straight-line distance between the two ends of the core wire after it has been bent in the expanded state of an expandable body and its own length. Since the core wire is straight in its natural state and is an elastic core wire, it has a tendency to return to its natural state. When L 膨胀体 For L 芯线 When the core wire is less than 50% (excluding 50%), the excessive bending generates a significantly increased increment of bending restoring force, which resists the expansion process of the expandable body; when L 膨胀体 For L 芯线 If the axial deformation of the expandable body is too small (excluding 95%), the radial expansion force generated in the initial stage of expansion will be reduced, thereby weakening the auxiliary expansion effect on the tubular implant.

[0018] In a preferred embodiment, the expandable body is a component with a hollow structure, which preferably includes any one or a combination of at least two of the following: a wire weaving structure, a wire binding structure, and a metal tube engraving structure.

[0019] The filament weaving structure can be understood as a tubular structure formed by cross-weaving of filaments (such as elastic filaments), which, after being shaped to a predetermined radial dimension, is radially contracted and fixed at predetermined intervals (the radial dimension after contraction is smaller than the shaped dimension), forming a segmented expandable woven body; the filament binding structure can be understood as a cylindrical outline formed by filaments (such as elastic filaments) arranged parallel along the direction of the cylindrical generatrix, which is radially contracted and fixed at predetermined intervals (the radial dimension after contraction is smaller than the initial cylindrical radius), forming a parallel warp-shaped expandable body; the metal tube engraving structure can be understood as a metal tube being hollowed out and engraved, pre-shaped to a predetermined radial dimension, and then radially contracted and fixed at predetermined intervals (the radial dimension after contraction is smaller than the shaped dimension), forming a segmented expandable hollow body.

[0020] The "change in axial contraction force of the expandable body during the transition from a contracted state to an expanded state" described in this application can be achieved by various means, typically but not limitingly including selecting the expandable body and the core wire as materials with different elastic moduli, or selecting the expandable body and the core wire as materials with different quantities, or selecting the expandable body and the core wire as materials with different dimensions, or any one or at least a combination of two of these.

[0021] Preferably, the expandable body is made of shape memory material, more preferably a shape memory alloy, and even more preferably a nickel-titanium alloy; the core wire is made of elastic material, which is preferably a metal, alloy, polymer material or composite material thereof, and more preferably a nickel-titanium alloy.

[0022] Preferably, the core wire and the expandable body are made of the same or different materials, and are both independently preferred from nickel-titanium alloy.

[0023] Preferably, the expandable body is made of filament, the core wire is made of the same material as the filament, and the diameter of the core wire is smaller than the diameter of the filament.

[0024] The core wire is made of the same material as the filament that constitutes the expandable body. The diameter of the core wire is smaller than that of the filament. This is one of the means to achieve "the change in axial contraction force of the expandable body is greater than the change in bending recovery force of the core wire during the transition from the contracted state to the expanded state". Moreover, this solution has the dual advantages of high process compatibility and structural simplification.

[0025] Preferably, when the expandable body is in an expanded state, the core wire is in a streamlined curved state.

[0026] The "streamlined bending state" refers to the bending shape of the core wire with a continuous and smooth curvature when the expandable body is in an expanded state, without local buckling or stress concentration points.

[0027] Preferably, the bending state of the core wire is approximately centrally symmetrical.

[0028] The central symmetry of the core wire's bending state can minimize the asymmetrical effect of the core wire on the expandable body, avoiding the delivery device from applying eccentric forces to the tubular implant. If the core wire is eccentrically bent, it will increase the probability of unilateral deformation and center of gravity shift in the expandable body, thereby causing the tubular implant to be subjected to non-uniform radial support forces, ultimately leading to the risk of poor adhesion.

[0029] Preferably, the core wire is attached to the inner wall of the expandable body in the expanded state.

[0030] The core wire is attached to the inner wall of the expandable body, which can increase the stability of the delivery device, reduce the shaking caused by the operator's pushing and pulling movements after expansion, and increase the controllability of the surgery.

[0031] Preferably, the end of the core wire is fixedly connected to the end of the expandable body in one of the following ways: the end of the core wire is directly fixedly connected to the end of the expandable body, or the core wire is passed through the fixing body and then fixedly connected to the end of the expandable body through the fixing body.

[0032] Preferably, the fixed connection method is independently selected from any one or a combination of at least two of welding, bonding, and mechanical fastening.

[0033] Preferably, the fixing body is selected from any one or a combination of at least two of the following: a fixing ring, a spiral coil, and a C-ring.

[0034] Preferably, the fixation body has a non-transmissive linearity.

[0035] Preferably, the outermost layer of the conveying device is further fitted with a protective external barrier, which is located at the same axial position as the fixed body. The protective external barrier is preferably a heat-shrinkable polymer sleeve or a radiation-proof sleeve.

[0036] In a preferred embodiment, the conveying device comprises two or more expandable bodies arranged axially.

[0037] Preferably, the two or more axially arranged expandable bodies are designed as a single unit. For example, tubular structural segments with a hollowed-out structure can be bound together.

[0038] Preferably, the core wires corresponding to adjacent expandable bodies are integrally formed continuous structures.

[0039] The number of expandable bodies can be selected according to the actual situation, preferably in relation to the length of the tubular implant to be implanted. The longer the tubular implant to be implanted, the more the number of expandable bodies can be increased to simultaneously provide the transmission of axial pushing force and the output of radial expansion force.

[0040] Designing the core wires of adjacent expandable bodies into a continuous, integral structure can increase the consistency of the transmission direction of the pushing force and further improve the axial pushing force during the conveying process.

[0041] Preferably, the connection between adjacent expandable bodies is provided with a protective external barrier, which is preferably a heat-shrinkable polymer sleeve or a radiation-proof sleeve.

[0042] The protective outer barrier effectively helps maintain the structural shape of the expandable body connection, such as maintaining a predetermined radial dimension. Simultaneously, the protective outer barrier also secures the internal fixing body in preset axial and circumferential positions, thereby enhancing the overall integrity and morphological stability of the conveying device and preventing component displacement or shape changes during conveying or release.

[0043] The second objective of this application is to provide a self-expanding tubular implant system, the tubular implant system comprising: Self-expanding tubular implant; One of the objectives is the delivery device for the self-expanding tubular implant; The self-expanding tubular implant is mounted on the outside of the expandable body of the delivery device.

[0044] The third objective of this application is to provide a self-expanding tubular implant system, the self-expanding tubular implant system comprising: Self-expanding tubular implant; One of the objectives is a delivery device for delivering a self-expanding tubular implant; the self-expanding tubular implant is mounted on the outside of the expandable body of the delivery device; A catheter or sheath is used to deliver a self-expanding tubular implant mounted on a delivery device.

[0045] Compared with the prior art, this application has the following beneficial effects: The delivery device provided in this application is compatible with small-sized microcatheters and can provide enhanced axial pushing force during delivery, thereby improving the delivery efficiency and operational stability of tubular implants; at the same time, the radial expansion force provided by the expandable body can provide effective auxiliary support for the implant, promoting its rapid adhesion and stable expansion, thereby improving the release effect of the implant. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the delivery device for delivering a self-expanding tubular implant provided in Example 1; Figure 2 A schematic diagram of the structure at the location of the fixing body 501 between the first expansion body 210 and the second expansion body 220 is given; Figure 3 A diagram showing the positional relationship between the fixing body 501 and the core wire 300 is provided. Figure 4 The delivery device for delivering a self-expanding tubular implant is provided in Example 2. Detailed Implementation

[0047] The technical solution of the present invention will be further explained and described below with reference to specific embodiments. However, it should be noted that the specific embodiments are only a specific implementation and explanation of the essence of the technical solution of the present invention, and should not be construed as a limitation on the scope of protection of the present invention.

[0048] Example 1 like Figures 1-3 ( Figure 1 This is a schematic diagram of the delivery device for delivering self-expanding tubular implants provided in Example 1. Figure 2 A structural schematic diagram showing the location of the fixing body 501 between the first expansion body 210 and the second expansion body 220 is provided. Figure 3 As shown in the diagram illustrating the positional relationship between the fixation body 501 and the core wire 300, Embodiment 1 provides a delivery device for delivering a self-expanding tubular implant, comprising: Push rod 100; A first expandable body 210, a second expandable body 220, and a third expandable body 230 are connected in series at the distal end of the push rod 100. The expandable body is configured to: elongate axially in a radially constrained contracted state; and expand radially and contract axially in a constrained expanded state. A microcatheter (not shown) can be sleeved on the outside of the expandable body to provide constraint. Typically, the support to be delivered is sleeved on the outside of the expandable body, and then the microcatheter is sleeved on. An elastic core wire 301 is threaded through each of the expandable bodies and connected to both ends thereto. The elastic core wire 301 remains straight in both its natural state and the contracted state of the expandable body. The elastic core wires 301 of the three expandable bodies are integrally designed to form a single core wire 300.

[0049] A pipe network with an axial length of 35 mm is made by using 18 nickel-titanium alloy wires (0.0015 inches in diameter) in a one-press-one-braid process; after heat treatment, it is pre-shaped into a braided structure with an outer diameter of 2.00±0.20 mm; the same type of nickel-titanium alloy wire is used as the core wire 300 (0.0015 inches in diameter, 35 mm in length), and helical coils (0.5 mm in length, 0.005 inches in outer diameter) are fixed at axial positions of 0 mm, 10.5 mm, 21 mm and 31.5 mm respectively as fixing bodies 501. A heat-shrinkable polymer sleeve is fixedly sleeved on the outside of the pipe network at the axial position of the fixing body 501 as a protective external barrier 502.

[0050] Figure 2 A structural schematic diagram showing the location of the fixing body 501 between the first expansion body 210 and the second expansion body 220 is provided. Figure 3 A schematic diagram showing the positional relationship between the fixing body 501 and the core wire 300 is provided; the spiral coil is fixed by bonding with the adhesive body 505; after the core wire 300 is inserted into the braided tube, it is stretched to the contracted state, aligned with the near end (position 0mm), and the tube is circumferentially constrained by the fixing body 501. The tube and the core wire 300 are cut off at the far end of 31.5mm to form three expansion bodies in series: the first expansion body 210, the second expansion body 220, and the third expansion body 230.

[0051] The method of circumferentially constraining the pipeline network by fixing body 501 allows for simultaneous bonding by adhesive body 505.

[0052] Because the number of braided tubing wires (18) far exceeds that of the core wire (1), and the diameter of the tubing wires (0.0015 inches) is the same as that of the core wire (0.0015 inches), the change in axial contraction force of the expandable body during the transition from a contracted to an expanded state is much greater than the change in bending recovery force of the core wire (more than 5 times). Therefore, when the expandable body is in an expanded state, the core wire is attached to the inner wall of the expandable body in a streamlined spiral bend, and the bend of the core wire is approximately centrally symmetrical.

[0053] In a preferred embodiment, the fixing body 501 can also be any structure that can act as a fixing medium, such as a fixing ring, a C-ring, etc.

[0054] In a preferred embodiment, the fixation body 501 is configured to have a non-transmissive linearity to enable visualization of the implant.

[0055] The fixing method of the fixing body and the core wire 300, as well as the fixing method of the fixing body and the pipeline, is independently selected from any one or a combination of at least two of welding, bonding, and mechanical fastening.

[0056] In other specific embodiments, the core wire 300 and the braided wire of the pipeline can be the same or different in size. For example, the braided wire of the pipeline is a 0.0015-inch nitinol alloy wire. The core wire 300 can be a 0.0015-inch nitinol alloy wire of the same type, or a 0.0010-inch nitinol alloy wire. It can also be made of other alternative metals, alloys, polymers, or other superelastic materials, shape memory materials, or piezoelectric materials.

[0057] In other specific embodiments, the conveying device may not be equipped with a fixed body, but may instead directly connect the predetermined position of the pipeline to the core wire 300 by a fixing method.

[0058] In other specific embodiments, the protective external barrier 502 may also be a radiation-impermeable sleeve fitted around the outside of the pipeline at the axial position of the fixed body 501.

[0059] Example 2 like Figure 4 ( Figure 4 As shown in Embodiment 2, a delivery device for delivering a self-expanding tubular implant is provided, comprising: Push rod 100; Three expandable bodies 200 are sequentially connected at the distal end of the push rod 100. The expandable bodies 200 are configured to: elongate axially in a radially constrained contracted state; expand radially and contract axially in a constrained expanded state; a microcatheter (not shown) may be fitted over the expandable body to provide constraint; typically, the support to be delivered is fitted over the expandable body, and then the microcatheter is fitted over it. An elastic core wire 301 is threaded through each of the expandable bodies 200 and connected to both ends thereto. The elastic core wire 301 remains straight in both its natural state and the contracted state of the expandable body 200. The elastic core wire of each of the expandable bodies 200 is integrally designed to form a single core wire 300.

[0060] Nickel-Titanium alloy tubing (outer diameter 0.25mm, length 35mm) is selected and laser-cut along the axial direction at predetermined positions according to a predetermined pattern to form a tubular structure with a hollowed-out grid. The hollowed-out area is composed of pillars forming a near-rhomboid hollowed-out grid, with each pillar having a circular cross-section and a diameter of 0.0015 inches. The non-hollowed-out area serves as a fixed body 501, with each segment having an axial length of 0.5mm.

[0061] The hollow tube is pre-shaped into a cylindrical structure that expands in the middle and tapers at both ends after heat treatment. The outer diameter of the cylindrical structure that expands in the middle is 2.00±0.20mm. The axial length of each hollow section is 10mm, and there are a total of three hollow sections.

[0062] Take a nickel-titanium alloy wire (0.0010 inch in diameter, 35 mm in length) and run it through the entire hollow tube; stretch the assembly to the contracted state; at the 0 mm (proximal end) position, bond and fix the first fixing body 501 to the core wire 300 to achieve axial positioning; at the 31.5 mm (far end) position, simultaneously cut the tube and the core wire 300 to obtain three series-connected expansion bodies 200.

[0063] Because the number of supports on the same cross-section of the hollow tube structure is much greater than the number of core wires (1 wire), and the diameter of the support (0.0015 inches) is greater than the diameter of the core wire (0.0010 inches), when transitioning from a contracted state to an expanded state, the change in axial contraction force of the expandable body is significantly higher than the change in bending recovery force of the core wire (more than 5 times). Therefore, when the expandable body is in an expanded state, the core wire exhibits a streamlined helical bending state.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A delivery device for delivering self-expanding tubular implants, characterized in that, The conveying device includes: Push lever; At least one expandable body is disposed at the distal end of the push rod, the expandable body being configured to: axially elongate in a radially constrained contracted state; and radially expand and axially contract in a constrained expanded state. An elastic core wire is threaded through the expandable body and connected to its two ends. The core wire remains straight in both the natural state and the contracted state of the expandable body.

2. The conveying device as described in claim 1, characterized in that, During the transition from a contracted state to an expanded state, the change in axial contraction force of the expandable body is greater than the change in bending recovery force of the core wire.

3. The conveying device as described in claim 1, characterized in that, The axial length of the expandable body in the expanded state is 50% to 95% of the length of the core wire in its natural state.

4. The conveying device as described in claim 1, characterized in that, The expandable body is a component with a hollow structure, which preferably includes any one or a combination of at least two of the following: a wire weaving structure, a wire binding structure, and a metal tube engraving structure.

5. The conveying device as described in claim 4, characterized in that, The expandable body is made of shape memory material, preferably a shape memory alloy, and more preferably a nickel-titanium alloy; The core wire is made of an elastic material, which is preferably a metal, alloy, polymer material or composite material thereof, and preferably a nickel-titanium alloy. Preferably, the core wire and the expandable body are made of the same or different materials, and are both independently preferably made of nickel-titanium alloy; Preferably, the expandable body is made of filament, the core wire is made of the same material as the filament, and the diameter of the core wire is smaller than the diameter of the filament.

6. The conveying device as claimed in claim 1, characterized in that, When the expandable body is in an expanded state, the core wire is in a streamlined curved state; Preferably, the bending state of the core wire is approximately centrally symmetrical; Preferably, the core wire is attached to the inner wall of the expandable body in the expanded state.

7. The conveying device as claimed in claim 1, characterized in that, The end of the core wire is fixedly connected to the end of the expandable body by one of the following methods: The end of the core wire is directly fixedly connected to the end of the expandable body, or the core wire passes through the fixing body and is then fixedly connected to the end of the expandable body through the fixing body. Preferably, the fixing connection method is independently selected from any one or a combination of at least two of welding, bonding, and mechanical fastening; Preferably, the fixing body is selected from any one or a combination of at least two of the following: a fixing ring, a spiral coil, and a C-ring; Preferably, the fixation body has a non-transmittent linearity; Preferably, the outermost layer of the conveying device is further fitted with a protective external barrier, which is located at the same axial position as the fixed body. The protective external barrier is preferably a heat-shrinkable polymer sleeve or a radiation-proof sleeve.

8. The conveying device as claimed in claim 1, characterized in that, The conveying device includes two or more of the expandable bodies arranged axially; Preferably, the two or more expandable bodies arranged axially are designed as a single unit; Preferably, the core wires corresponding to adjacent expandable bodies are integrally formed continuous structures; Preferably, the connection between adjacent expandable bodies is provided with a protective external barrier, which is preferably a heat-shrinkable polymer sleeve or a radiation-proof sleeve.

9. A self-expanding tubular implant system, characterized in that, The tubular implant system includes: Self-expanding tubular implant; Delivery device for delivering self-expanding tubular implants as described in any one of claims 1 to 8; The self-expanding tubular implant is mounted on the outside of the expandable body of the delivery device.

10. A self-expanding tubular implant system, characterized in that, The self-expanding tubular implant system includes: Self-expanding tubular implant; The delivery device for delivering a self-expanding tubular implant according to any one of claims 1 to 8; wherein the self-expanding tubular implant is mounted on the outside of the expandable body of the delivery device; A catheter or sheath is used to deliver a self-expanding tubular implant mounted on a delivery device.

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