Conveyor and stent delivery system

Abstract

The present invention relates to a conveyor and a stent delivery system, wherein the conveyor comprises: an inner core tube, a catheter sleeved outside the inner core tube, and a handle connected to the proximal end of the inner core tube; the inner core tube is provided with a plurality of hooks arranged at intervals along the circumferential direction of the conveyor; the handle is provided with a knob, the knob is transmission-connected to the inner core tube, and the knob drives the inner core tube and the hook to rotate about the longitudinal center axis of the conveyor under the action of an external force, thereby loosening the implant hooked on the hook. When the catheter is withdrawn to expose the implant, due to the presence of the hook, the hook on the inner core tube of the implant is connected to the implant, and when the catheter is withdrawn, the implant will not move with the catheter, thereby preventing the implant from shortening and ensuring the accurate release of the implant.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a conveyor and a stent conveying system. Background Art

[0002] Interventional therapy offers the advantages of accuracy, minimal invasiveness, and safety. As one of the three pillars of clinical medicine, it has become the preferred treatment for several diseases. With the continuous development and advancement of interventional therapy technologies, the advantages of using stents to treat cardiovascular diseases such as aneurysms, arterial dissections, and vascular stenosis are becoming increasingly prominent, making them a common interventional treatment method. The principle is to implant a stent into the affected blood vessel via a delivery system catheter, providing support and coverage for the narrowed, occluded, or ruptured vessel, thereby restoring blood flow.

[0003] The stent delivery system is crucial to the entire interventional treatment method. The main body of the existing stent delivery system can be divided into three parts: a handle, a core wire, and a catheter. When assembling the stent, the operator presses the stent radially onto the core wire, and the core wire fixes the stent and pushes it into the catheter to complete the assembly. The delivery system designer usually sets an anchoring or thickening structure on the core wire to give the part of the stent entering the catheter a backward pulling fixing force or friction force during the stent assembly process to ensure that the stent can enter the catheter completely without stacking; on the other hand, when the stent is released, the tip of the core wire reaches the lesion site and is fixed. The operator turns on the handle switch of the delivery system and drags the catheter backward to release the stent until the handle reaches the specified stroke and the release is completed. During the release process, the catheter retreats to prevent the stent from shortening during the withdrawal and release of the catheter. Most delivery systems choose to set a thickening structure on the core wire to increase the friction of the stent on the catheter wall to prevent the stent from shortening.

[0004] However, in actual applications, the above-mentioned stent delivery system structure has many instabilities. The thickened part of the core wire uses friction to fix the stent body to prevent shortening. The thickness change caused by the thickened part directly affects the assembly and release force of the stent, and the volume of the stent after compression and the volume of the thickened part cannot be fully controlled. Problems such as large stent assembly force and large stent release force and difficulty in release often occur. In severe cases, it directly leads to incomplete release or breakage of the stent. Implantable stents usually do not have a recovery function. If such problems occur, it will directly lead to serious medical accidents. In the end, the blood vessel may have to be opened to remove the stent, causing great trauma to the patient. Summary of the Invention

[0005] Based on this, it is necessary to provide a delivery device that can prevent the luminal stent from shortening and accurately release the luminal stent.

[0006] The present invention provides a conveyor, comprising an inner core tube and a catheter sleeved outside the inner core tube;

[0007] The inner core tube is provided with a plurality of hooks arranged at intervals along the circumferential direction of the conveyor;

[0008] The hooking member includes a connecting portion and an inclined portion, wherein the connecting portion connects the inner core tube and the inclined portion, and the inclined portion is inclined relative to the longitudinal center axis of the conveyor;

[0009] Under the action of external force, the inner core tube can drive the hooking member to rotate with the longitudinal center axis of the conveyor as the rotation axis, thereby loosening the implant hooked on the inclined portion.

[0010] In one embodiment, the inner core tube includes a core shaft and a guide head connected to the distal end of the core shaft;

[0011] The hooking member includes a connecting portion and an inclined portion; the connecting portion is connected to the proximal end of the guide head and extends along the axial direction of the conveyor; the inclined portion is connected to the proximal end of the connecting portion, and the inner side surfaces of the inclined portions of most of the hooking members are twisted along the same circumferential direction of the inner core tube.

[0012] In one embodiment, the hooking member includes a wide hooking member and a narrow hooking member, and in the circumferential direction of the conveyor, the width of the wide hooking member is greater than the width of the narrow hooking member.

[0013] In one embodiment, the number of the wide hook members and the narrow hook members is the same, and they are distributed alternately along the circumferential direction of the conveyor.

[0014] In one embodiment, the plurality of hook members include a long hook member and a short hook member. In the axial direction of the core shaft, the length of the long hook member is greater than the length of the short hook member, and the proximal end of the long hook member is closer to the proximal end of the core shaft than the proximal end of the short hook member.

[0015] In one embodiment, the connecting portion is connected to the inner core tube, the proximal end of the inclined portion is connected to the connecting portion, and the distal end of the inclined portion is separated from the inner core tube;

[0016] The angle between the inclined portion and the longitudinal center axis of the inner core tube is α, and α is less than 90°.

[0017] In one embodiment, the hook member includes a long hook member and a short hook member, and the length of the inclined portion of the long hook member is greater than the length of the inclined portion of the short hook member.

[0018] In one embodiment, the number of the long hook members and the short hook members is the same, and they are distributed alternately along the circumferential direction of the conveyor.

[0019] In one embodiment, the inner core tube is provided with several groups of hook hangers arranged at intervals along the circumferential direction of the inner core tube, each group of hook hangers includes a long hook hanger and a short hook hanger; the long hook hanger is closer to the proximal end of the inner core tube than the short hook hanger.

[0020] The present application also provides a stent delivery system, which includes a luminal stent and any one of the above-mentioned conveyors, wherein the luminal stent includes a plurality of bare wave rings, and the plurality of bare wave rings have wave peaks corresponding one to one with the hooking parts, and each of the wave peaks is hooked on the hooking part.

[0021] In this application, when the catheter is withdrawn to expose the implant, the hook member on the implant's inner core tube remains connected to the implant, preventing the implant from moving with the catheter as the catheter is withdrawn, thereby preventing implant shortening. Furthermore, since the catheter is withdrawn, completely exposing the implant and supporting it against the vessel wall, the inner core tube is rotated to release the proximal end of the implant, thereby releasing the implant in steps, reducing implant bounce during release and achieving precise implant release. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of the luminal stent in Example 1 of the present invention.

[0023] Figure 2 This is a schematic structural diagram of the conveyor in Example 1 of the present invention.

[0024] Figure 3 This is a schematic diagram of the partial structure of the inner core tube in Example 1 of the present invention.

[0025] Figure 4 This is a schematic diagram of the stent delivery system in Example 1 of the present invention releasing a luminal stent in the blood vessel wall.

[0026] Figure 5 This is a schematic structural diagram of the guide head and hook member in Example 1 of the present invention (the inner core tube is hidden).

[0027] Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0028] Figure 7 This is a partial schematic diagram of the hook member connected to the luminal stent in Example 1 of the present invention.

[0029] Figure 8 for Figure 7 Cross-sectional view at point B.

[0030] Figure 9 for Figure 7 Cross-sectional view at B ( Figure 8 After the inner core tube and the hook are rotated to a certain angle).

[0031] Figure 10 This is a partial schematic diagram of the hook member connected to the luminal stent in Example 2 of the present invention.

[0032] Figure 11 for Figure 10 Cross-sectional view at point C in the middle.

[0033] Figure 12 for Figure 10 Cross-sectional view at C in the middle ( Figure 11 After the inner core tube and the hook are rotated to a certain angle).

[0034] Figure 13 Schematic diagram of the structure of the luminal stent in other embodiments of the present invention.

[0035] Figure 14 Schematic diagram of the structure of the guide head and the hook member in other embodiments of the present invention (the inner core tube is hidden).

[0036] Figure 15 This is a schematic diagram of the partial structure of the hook member and the inner core tube in Example 3 of the present invention.

[0037] Figure 16 for Figure 15 Enlarged view of point D in the middle.

[0038] Figure 17 This is a partial schematic diagram of the hook member connected to the luminal stent in Example 3 of the present invention.

[0039] Figure 18 This is a schematic diagram of the partial structure of the hook member and the inner core tube in Example 4 of the present invention.

[0040] Figure 19 for Figure 18 Enlarged view of point E in the middle. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0043] To more accurately describe the structural features and application characteristics of the present invention, when describing interventional devices, the directional term "proximal" refers to the side of the delivery system closest to the operator, and "distal" refers to the side away from the delivery system operator. When describing implantable stents, "proximal" refers to the side closest to the human heart, and "distal" refers to the side away from the human heart. "Axial" refers to the direction parallel to the line connecting the distal and proximal centers of the medical device, and "radial" refers to the direction perpendicular to the axial direction. Example 1

[0044] This embodiment provides a stent delivery system, comprising a delivery device and a luminal stent, wherein the delivery device is used to deliver the luminal stent to a site to be treated and release the luminal stent. Figure 1 The luminal stent 01 includes a plurality of bare wave coils 011 and a coating 012 covering part of the bare wave coils 011. The plurality of bare wave coils 011 are arranged axially and spaced apart. The plurality of wave coils are fixed by the coating 012 or connected by a connecting rod. Each of the bare wave coils 011 includes a plurality of wave crests 0111 and wave troughs 0112 arranged alternately, and a wave rod 0113 is connected between the wave crests 0111 and the wave troughs 0112. The bare wave coils 011 are composed of braided wires, which are stainless steel wires, nickel-titanium wires or other biological material braided wires. The material of the coating 012 is polyester or expanded polytetrafluoroethylene (e-PTFE).

[0045] See also Figure 2 and Figure 3 The conveyor 100 includes an inner core tube 110, a catheter 120 sleeved outside the inner core tube 110, and a handle 130 connected to the proximal end of the inner core tube 110. The inner core tube 110 is provided with a plurality of hooks 140 spaced apart along the circumferential direction of the conveyor 100. The handle 130 includes a handle body 131, on which are provided a button 132 and a knob 133. The knob 133 is connected to the catheter 120 and is used to control the axial movement of the catheter 120 relative to the inner core tube 110. The knob 133 is in transmission connection with the inner core tube 110, and when an external force is applied, the knob 133 drives the inner core tube 110 and the hook 140 to rotate about the longitudinal center axis of the conveyor 100, thereby loosening the implant hooked on the hook 140.

[0046] like Figure 4As shown, in this embodiment, the implant is a tubular stent 01, and the number of wave crests 0111a on the bare wave ring at the proximal end of the tubular stent 01 (hereinafter referred to as the bare wave ring at the proximal end is the proximal first wave 011a) is the same as the number of the hooking parts 140. When assembling the tubular stent 01, the proximal first wave 011a is first radially gripped and the wave crest 0111a of the proximal first wave 011a is assembled on the hooking part 140. After the gripping force is removed, the assembled proximal first wave 011a will spontaneously expand outward due to its own radial outward expansion force, and at this time, the wave crest 0111a hooked on the hooking part 140 is restricted from moving, so that the proximal first wave 011a is fixed on the inner core tube 110.

[0047] To release the stent 01, the operator manipulates button 132 to retract the catheter 120. However, due to the restraint of hook 140, stent 01 does not retract with the catheter 120, effectively ensuring the proper release of stent 01. When the distal end of catheter 120 retracts to the distal end of stent 01, stent 01 deploys from catheter 120 and rests on vessel wall 1. The proximal end of stent 01 remains hooked to hook 140. Rotating knob 133 on handle 130 drives the core tube 110 and hook 140, freeing the proximal end of stent 01 from hook 140. The presence of hook 140 prevents axial movement and shortening of stent 01 during release. Furthermore, the phased release reduces stent 01's bouncing and impact on vessel wall 1, improving release accuracy.

[0048] In other embodiments, the hooking member may be disposed away from the distal end of the inner core tube, so that the hooking member can be connected to the farthest wave ring (ie, the distal first wave 011b) on the luminal stent.

[0049] Combine Figure 3 、 Figure 5 and Figure 6 As shown, in this embodiment, the inner core tube 110 includes a core shaft 112 and a guide head 111 connected to the distal end of the core shaft 112. The hook member 140 includes a connecting portion 141 and an inclined portion 142; the connecting portion 141 is connected to the proximal end of the guide head 111 and extends along the axial direction of the conveyor 100; the inclined portion 142 is connected to the proximal end of the connecting portion 141, and the inner side surfaces 1421 of the inclined portions 142 of the multiple hook members 140 are all twisted along the same circumferential direction of the inner core tube 110, as shown in FIG. Figure 5As shown in , each of the inclined portions 142 is twisted along the P direction. In actual application, the hook member 140 is preferably made of high-strength and wear-resistant medical-grade POM or 304 stainless steel, and the guide head 111 is preferably made of a skin-friendly material such as block polyetheramide resin. The guide head 111 and the hook member 140 can be fixedly connected by integral injection molding, ultrasonic welding, adhesive bonding, etc. The proximal end of the core shaft 112 can also be provided with an anchor 113 and a movable tube 114. The anchor 113 is used to hook with the distal end of the luminal stent 01, further limiting the movement of the luminal stent 01 in the axial direction. The movable tube 114 is used to connect the knob 133 and the core shaft 112. In other embodiments, the knob may not be directly connected to the movable tube. A reduction gear set may be provided between the movable tube and the knob. The knob uses high-speed teeth, while the movable tube portion uses reduction teeth, so that the knob travel rotation angle is increased and the rotation accuracy of the inner core tube and the hook member is improved.

[0050] It should be noted that the structure opposite to the inner side surface 1421 of the inclined portion 142 twisting along the circumferential direction of the inner core tube 110 is a hook that only bends inward. For the hook design that only bends inward without twisting, due to the radial outward self-expansion force of the luminal stent itself, the connection part of the hook blocks the outward expansion of the luminal stent. When the luminal stent needs to be completely released, the luminal stent may not be released. The edge 1422 of the inclined portion 142 in this embodiment is also spiral, such as Figures 7 to 9 As shown, when the inner core tube 110 and the hook 140 rotate along the direction Q, the edge 1422 of the inclined portion 142 abuts against the wave crest 0111a of the luminal stent 01. Since the proximal first wave 011a of the metal wire material has a certain flexibility, the edge 1422 of the inclined portion 142 will squeeze and push the wave crest 0111a to gradually move along the end of the inclined portion 142 until the wave crest 0111a completely escapes from the inclined portion 142. As the inner core tube 110 rotates, the wave crest 0111a can be smoothly released from the hook 140, completing the complete release of the luminal stent 01. Further, as shown in FIG. Figure 8 As shown, the width of the inclined portion 142 gradually decreases from the root to the end of the inclined portion, so that the edge 1422 of the inclined portion 142 is more inclined, which is more conducive to the peak 0111a escaping from the inclined portion 142 when the inner core tube 110 rotates. Example 2

[0051] The endoluminal stent delivery system provided in Example 2 is basically the same as the endoluminal stent delivery system provided in Example 1, and also includes an endoluminal stent and a delivery device. The endoluminal stent also includes a bare corrugated ring and a film covering at least part of the bare corrugated ring; the delivery device also includes an inner core tube, a catheter and a handle. The main difference between the delivery device in Example 2 and the delivery device in Example 1 is that Figure 10 As shown, the plurality of hooking members 240 include a wide hooking member 2401 and a narrow hooking member 2402. In the circumferential direction of the conveyor, the width of the wide hooking member 2401 is greater than the width of the narrow hooking member 2402. It can be understood that when the width of the hooking member 240 is wider, the angle that the inner core tube 210 needs to rotate in the process of releasing the peak 0111a from the inclined portion 242 is larger. Therefore, in the conveyor of this embodiment, as shown in FIG. Figure 11 and Figure 12 As shown, the inner core tube 210 and the hook member 240 are rotated in the Q direction. When the peak 0111a hooked on the narrow hook member 2402 is released, the peak 0111a hooked on the wide hook member 2401 is still trapped in the inclined portion 242. The inner core tube 210 and the hook member 240 need to be rotated further to release the peak 0111a hooked on the narrow hook member.

[0052] When deploying a stent with a conventional delivery system, the proximal and distal bare wave coils of the luminal stent (hereinafter referred to as the proximal first wave and the distal first wave) often experience uncontrollable bounce upon release from the catheter. Bounce during the proximal first wave of the luminal stent can easily lead to inaccurate positioning and introduce uncertainty into the delivery process. Bounce during the distal first wave of the luminal stent can easily cause the stent to shorten forward (commonly seen with bare stents), resulting in poor stent delivery morphology.

[0053] Therefore, if Figure 11 and Figure 12 As shown, the conveyor of this embodiment can release the wave crests 0111a on the bare wave ring in batches. The wave crests 0111a released first will anchor to the blood vessel wall, playing the role of positioning and anchoring. The inner core tube 210 continues to rotate to release the remaining wave crests 0111a. Due to the anchoring of the wave crests 0111a released first, the bounce of the luminal stent 01 can be greatly reduced, making the release of the luminal stent 01 more accurate.

[0054] In this embodiment, if Figure 11 and Figure 12 As shown, the number of the wide hooks 2401 and the narrow hooks 2402 is the same, and they are distributed alternately along the circumferential direction of the conveyor, so the force on the luminal stent 01 is more uniform when released.

[0055] It should be noted that, according to the different structures of the proximal first wave or the distal first wave, the length of the hook 240 can be set to the same length or different lengths. Specifically, in this embodiment, for the proximal first wave or the distal first wave with the same height peak, the length of the hook 240 on the inner core tube 220 is the same; for Figure 13The endoluminal stent 02 shown has a long wave crest 021a and a short wave crest 021b, and the corresponding conveyor should have hooks 340 of different lengths, such as Figure 14 As shown, the delivery device in this embodiment has a long hook 3401 and a short hook 3402. The long hook 3401 is longer than the short hook 3402, and the proximal end of the long hook 3401 is closer to the proximal end of the delivery device than the proximal end of the short hook 3402. The long hook 3401 hooks onto the short wave crest 021b, while the short hook 3402 hooks onto the long wave crest 021a. The width of the long hook 3401 is smaller than that of the short hook 3402. When releasing the endoluminal stent 02, the short wave crest 021b is released first, supporting it on the vessel wall, and the long wave crest 021a is released later. This reduces the bouncing of the endoluminal stent during release and allows for more precise release positioning. In other embodiments, the width of the long hook can be greater than that of the short hook, or the long and short hooks can be the same width. Example 3

[0056] The endoluminal stent delivery system provided in Example 3 is basically the same as the endoluminal stent delivery system provided in Example 1, and also includes an endoluminal stent and a delivery device. The endoluminal stent also includes a bare corrugated ring and a coating that covers at least part of the bare corrugated ring; the delivery device also includes an inner core tube, a catheter, and a handle. The main difference between the delivery device in Example 3 and the delivery device in Example 1 is that the specific structure of the hook in Example 3 is different from the specific structure of the hook in Example 1. Figure 15 and Figure 16 As shown, the hook member 440 in Example 3 includes a connecting portion 441 and an inclined portion 442, the connecting portion 441 is connected to the inner core tube 410, the proximal end of the inclined portion 442 is connected to the connecting portion 441, and the distal end of the inclined portion 442 is separated from the inner core tube 410; Figure 17 As shown, the angle between the inclined portion 442 and the longitudinal center axis Z of the inner core tube is α, and α is less than 90°.

[0057] When the inner core tube 410 and the hook 440 rotate, the edge of the inclined portion 442 abuts against the wave crest 0111a of the tubular stent. Since the wave crest 0111a made of metal wire has a certain flexibility, the edge of the inclined portion 442 will squeeze and push the wave crest 0111a to gradually move along the end of the inclined portion 442 until the wave crest 0111a completely escapes from the inclined portion 442. As the inner core tube 410 rotates, the wave crest 0111a can be smoothly released from the hook 440, completing the complete release of the tubular stent. Example 4

[0058] The endoluminal stent delivery system provided in Example 4 is basically the same as the endoluminal stent delivery system provided in Example 3, and also includes an endoluminal stent and a delivery device. The endoluminal stent also includes a bare corrugated ring and a film covering at least part of the bare corrugated ring; the delivery device also includes an inner core tube, a catheter and a handle. The main difference between the delivery device in Example 4 and the delivery device in Example 3 is that, Figure 18 and Figure 19 As shown, the plurality of hooks 540 include a long hook 5401 and a short hook 5402 , and the length of the inclined portion 54011 of the long hook 5401 is greater than the length of the inclined portion 54021 of the short hook 5402 .

[0059] Furthermore, the number of long hooks 5401 and short hooks 5402 is equal and alternately spaced along the circumference of the conveyor. When releasing the stent, as the core tube 510 and hooks 540 rotate, the peaks 0111a hooked to the short hooks 5402 are released first, followed by the peaks 0111a hooked to the long hooks 5401. This phased release of the peaks 0111a and the uniform circumferential force applied to them minimizes bouncing during stent release and allows for more precise release positions.

[0060] It should be noted that, according to the different structures of the bare wave coil, the position of the hook 540 on the inner core tube 510 is adjusted to adapt to the wave crests of different lengths. Specifically, for bare wave coils with the same height of wave crests, the axial position of the hook 540 on the inner core tube 510 is the same; for the endoluminal stents with long wave crests and short wave crests, the arrangement position of the hook on the inner core tube is different, such as Figure 18 As shown, the hooking piece closer to the proximal end of the inner core tube 510 is used to hook the short wave peak, and the hooking piece closer to the distal end of the inner core tube 510 is used to hook the long wave peak.

[0061] In other embodiments, a plurality of hook member groups can be provided on the inner core tube, spaced apart along the circumferential direction of the inner core tube, each hook member group including a long hook member and a short hook member; the long hook member is closer to the proximal end of the inner core tube than the short hook member. Specifically, each hook member group corresponds to a wave crest, the short hook member is provided at the narrowest part of the wave crest, and the long hook member is provided at the widest part of the wave crest. As the inner core tube and the hook member rotate, the tip of the wave crest first disengages from the short hook member, and the wave rod of the wave crest then disengages from the long hook member. This enables the segmented release of the same wave crest, further reducing the bouncing during the release of the luminal stent.

[0062] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A conveyor, characterized in that: include: An inner core tube and a catheter sleeved outside the inner core tube; The inner core tube is provided with a plurality of hooks arranged at intervals along the circumferential direction of the conveyor, and the inner core tube includes a core shaft and a guide head connected to the distal end of the core shaft; The hooking member includes a connecting portion and an inclined portion, the connecting portion connecting the inner core tube and the inclined portion, the inclined portion being inclined relative to the longitudinal center axis of the conveyor, the connecting portion being connected to the proximal end of the guide head and extending along the axial direction of the conveyor; the inclined portion being connected to the proximal end of the connecting portion, and the inner side surfaces of the inclined portions of the plurality of hooking members are all twisted along the same circumferential direction of the inner core tube; The hooking member is used to correspond to the wave crests of the multiple bare wave rings of the endoluminal stent one by one and hook each of the wave crests; the inner core tube can drive the hooking member to rotate with the longitudinal center axis of the conveyor as the rotation axis under the action of external force, and the edge of the inclined portion will squeeze and push the wave crest to gradually move toward the end of the inclined portion until the wave crest completely escapes from the inclined portion; The multiple hook members include wide hook members and narrow hook members. In the circumferential direction of the conveyor, the width of the wide hook member is greater than the width of the narrow hook member. When the width of the hook member is wider, the angle at which the inner core tube needs to rotate in the process of freeing the wave peak from the inclined part is greater.

2. The conveyor according to claim 1, characterized in that The number of the wide hook members and the narrow hook members is the same and they are distributed alternately along the circumferential direction of the conveyor.

3. The conveyor according to claim 1, characterized in that The plurality of hooks include long hooks and short hooks. In the axial direction of the core shaft, the length of the long hook is greater than that of the short hook, and the proximal end of the long hook is closer to the proximal end of the core shaft than the proximal end of the short hook.

4. The conveyor according to claim 1, characterized in that The connecting portion is connected to the inner core tube, the proximal end of the inclined portion is connected to the connecting portion, and the distal end of the inclined portion is separated from the inner core tube; The angle between the inclined portion and the longitudinal center axis of the inner core tube is α, and α is less than 90°.

5. The conveyor according to claim 4, characterized in that The plurality of hooks include long hooks and short hooks, and the inclined portion of the long hook is longer than the inclined portion of the short hook.

6. The conveyor according to claim 5, characterized in that The number of the long hook members and the short hook members is the same and they are distributed alternately along the circumferential direction of the conveyor.

7. A stent delivery system, characterized in that: It comprises a luminal support and the conveyor according to any one of claims 1 to 6; the luminal support comprises a plurality of bare corrugations.

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