Bracket transport device

Abstract

The present invention relates to a stent transport device for transporting a coated stent into a blood vessel, comprising: a rear-release fixing assembly, a tube body assembly and a guide head; the rear-release fixing assembly has a plurality of circumferentially arranged fixed anchor points, the fixed anchor points are used to limit and fix the stent ring of the coated stent, the distance between the fixed anchor point on the first side of the rear-release fixing assembly and the rear end face of the rear-release fixing assembly is greater than the distance between the fixed anchor point on the second side of the rear-release fixing assembly and the rear end face of the rear-release fixing assembly, so that the stent ring near the second side has the freedom to slide toward the rear end of the rear-release fixing assembly, when the stent ring near the first side is limited and fixed, the stent ring near the second side can still slide toward the rear end, which can reduce the stent ring at the head end of the coated stent from warping due to external force, and reduce the probability of a "bird's beak" phenomenon after the coated stent is released.

Description

Technical Field

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

[0002] In recent years, with the continuous development of endovascular interventional surgery, thoracic aortic endovascular repair has been increasingly used in the clinical treatment of aortic aneurysm and aortic dissection due to its advantages of safety, minimal invasiveness and rapid recovery.

[0003] The primary cause of aortic aneurysms is insufficient strength or elasticity in certain areas of the blood vessel wall, causing abnormal collisions or stretching of the vessel wall as blood passes through it. Aortic aneurysms are more common in the abdominal and thoracic aortas, while aortic dissections are more common in the thoracic aorta. To prevent the continued tearing of aortic dissections and aneurysm rupture, current clinical treatments often rely on interventional procedures. Typically, a covered stent graft is combined with a delivery system and placed at the site of the lesion through an access procedure to seal the false lumen or aneurysm cavity.

[0004] At present, the main method of release by withdrawing the sheath is used on the market. The delivery system releases the overall structure of the stent graft by withdrawing the sheath. After the stent graft is released as a whole, the proximal stent ring of the stent graft is released by the post-release fixture, thereby achieving precise release of the stent. However, due to the relatively complex structural morphology of the aorta, and during the release process, the presence of the guidewire causes the delivery sheath to stick to the greater curvature of the blood vessel. In addition, the proximal end of the stent graft is constrained by the post-release device. As a result, after the stent graft is released, the proximal end of the stent graft has poor adhesion to the vascular wall on the lesser curvature of the blood vessel, making the proximal end of the stent graft prone to the "bird's beak" phenomenon, which in turn causes complications such as endoleak, displacement, and new stent-induced ruptures. Summary of the Invention

[0005] Based on this, it is necessary to provide a stent transport device to address the problem of the "bird's beak" phenomenon that is easily caused by the poor adhesion of the covered stent to the vascular wall on the lesser curvature side of the blood vessel at the proximal end.

[0006] A stent transport device for transporting a covered stent into a blood vessel, comprising:

[0007] A rear-release fixing assembly, wherein the rear-release fixing assembly has a plurality of circumferentially arranged fixing anchors, the fixing anchors being used to limit and fix the stent ring of the coated stent, the distance between the fixing anchor near the first side of the rear-release fixing assembly and the rear end face of the rear-release fixing assembly being greater than the distance between the fixing anchor near the second side of the rear-release fixing assembly and the rear end face of the rear-release fixing assembly; wherein the first side and the second side are opposite sides of the rear-release fixing assembly in the circumferential direction; a tube body assembly, wherein the tube body assembly is arranged at the rear end of the rear-release fixing assembly and has a coated cavity for accommodating the coated stent; and a guide head, wherein the guide head is arranged at the front end of the rear-release fixing assembly.

[0008] In one embodiment, the rear release fixing assembly includes a fixing body and a plurality of claw arms, the fixing body includes a tube body connecting portion and a plurality of claw arm connecting portions, the claw arm connecting portion is circumferentially protruded from the side surface of the tube body connecting portion, the claw arm extends from the claw arm connecting portion toward the front end of the tube body connecting portion along an axial direction parallel to the tube body connecting portion, the distance between the front surface of the claw arm connecting portion close to the first side and the rear end surface of the tube body connecting portion is greater than the distance between the front surface of the claw arm connecting portion close to the second side and the rear end surface of the tube body connecting portion, and the fixing anchor points are respectively arranged on the front surfaces of the claw arm connecting portions.

[0009] In one embodiment, the front surface of the claw arm connecting portion is connected to the front surface of the tube connecting portion.

[0010] In one embodiment, the rear release fixing assembly includes a fixing body and a plurality of claw arms, the fixing body includes a tube body connecting portion, the claw arms extend from the tube body connecting portion toward the front end of the tube body connecting portion along an axial direction parallel to the tube body connecting portion, the distance between the front surface of the tube body connecting portion close to the first side and the rear end surface of the tube body connecting portion is greater than the distance between the front surface of the tube body connecting portion close to the second side and the rear end surface of the tube body connecting portion, and the fixing anchor point is arranged on the front surface of the tube body connecting portion.

[0011] In one embodiment, the front end surface of the tube connecting portion extends obliquely from the first side toward the rear end surface of the tube connecting portion to the second side.

[0012] In one embodiment, the front end face of the tube body connecting portion includes a first front end face close to the first side and a second front end face close to the second side, and the distance between the first front end face and the rear end face of the tube body connecting portion is greater than the distance between the second front end face and the rear end face of the tube body connecting portion.

[0013] In one embodiment, the front ends of the claw arms are kept flush, and the length of the claw arm close to the second side is at least twice the length of the claw arm close to the first side.

[0014] In one embodiment, the front surface of the claw arm connecting portion extends obliquely from the fixing body in a direction away from the rear end surface of the fixing body to the claw arm.

[0015] In one embodiment, the fixed body is provided with a through hole extending along the axial direction of the fixed body; the tube body assembly includes an inner core tube, a core tube, a top tube and a sheath tube arranged in sequence from the inside to the outside, and the top tube and the sheath tube are arranged at intervals to form the coating cavity; the core tube is connected to the rear end of the fixed body, and the inner core tube is connected to the guide head through the through hole.

[0016] In one embodiment, the guide head includes an introduction part and a clamping part connected to the introduction part, the diameter of the introduction part gradually increases from the front end to the rear end of the introduction part, the diameter of the clamping part is smaller than the rear end diameter of the introduction part, and the clamping part is clamped in the clamping interface formed by each of the claw arms.

[0017] The stent transport device of the present application can be used to transport the coated stent into a blood vessel. When using the stent transport device, the coated stent can be pressed and gripped into the coated cavity of the tube body assembly, and the stent ring at the head end of the coated stent can be limited and fixed to the various fixed anchor points of the post-release fixing assembly before the coated stent is transported and released.

[0018] The present invention controls the distance between the fixed anchor point on the first side of the rear-release fixing assembly and the rear end surface of the rear-release fixing assembly to be greater than the distance between the fixed anchor point on the second side of the rear-release fixing assembly and the rear end surface of the rear-release fixing assembly, so that the stent ring near the second side has the freedom to slide toward the rear end of the rear-release fixing assembly. When the stent ring near the first side is fixed in a limited position, the stent ring near the second side can still slide toward the rear end. After the stent graft is implanted in a blood vessel, when the sheath is withdrawn, the stent graft slides toward the rear end under the action of external force. However, under the limiting action of the fixed anchor point, the stent graft as a whole is close to the greater curvature of the blood vessel. Since the stent ring near the second side has the freedom to slide toward the rear end, the stent ring near the second side is driven to slide further toward the rear end, and the stent graft near the second side retreats backward, reducing the stent ring at the tip end of the stent graft due to the action of external force and allowing the tip end of the stent graft to better fit the blood vessel wall on the lesser curvature of the blood vessel, thereby reducing the probability of the "bird's beak" phenomenon after the stent graft is released. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic plan view of a stent delivery device is provided for one embodiment of the present application;

[0020] Figure 2 1 is a schematic plan view showing a rear-release fixation assembly of a first example of a stent delivery device according to the above embodiment of the present application;

[0021] Figure 3 1 is a perspective schematic diagram showing a rear-release fixation assembly of a first example of a stent delivery device according to the above embodiment of the present application;

[0022] Figure 4 1 is a schematic plan view showing a rear-release fixation assembly of a second example of the stent delivery device according to the above embodiment of the present application;

[0023] Figure 5 1 is a perspective schematic diagram showing a rear-release fixation assembly of a second example of the stent delivery device according to the above embodiment of the present application;

[0024] Figure 6 It is a schematic diagram showing the stent delivery device according to the above embodiment of the present application releasing the covered stent in a blood vessel.

[0025] Figure markings: 10, rear-release fixation assembly; 11, fixed anchor point; 12, first side; 13, second side; 14, fixed body; 141, tube body connection part; 142, claw arm connection part; 15, claw arm; 20, tube body assembly; 21, inner core tube; 22, core tube; 23, top tube; 24, sheath tube; 30, guide head; 31, introduction part; 32, clamping part; 40, coated stent; 41, stent ring; 50, blood vessel; 51, greater curvature side; 52, lesser curvature side. DETAILED DESCRIPTION

[0026] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, 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 should not be understood as limiting the present invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0030] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0032] Based on the problem that in current interventional treatment, the coated stent is prone to the "bird's beak" phenomenon after release due to the poor adhesion of the coated stent to the vascular wall on the lesser curvature side of the blood vessel at the proximal end, the present application provides a stent transportation device that can solve the "bird's beak" phenomenon generated after the coated stent is released.

[0033] Specifically, see Figure 1 and Figure 2 The stent transport device of the present application may include a post-release fixation assembly 10, a tubular assembly 20, and a guide head 30. The post-release fixation assembly 10 has a plurality of circumferentially arranged anchor points 11 for securing the stent ring 41 of the stent graft 40. The distance between the anchor points 11 near a first side 12 of the post-release fixation assembly 10 and the rear end surface of the post-release fixation assembly 10 is greater than the distance between the anchor points 11 near a second side 13 of the post-release fixation assembly 10 and the rear end surface of the post-release fixation assembly 10. The first side 12 and the second side 13 are opposite sides of the post-release fixation assembly 10 in the circumferential direction. When transporting the stent graft 40, the first side 12 of the post-release fixation assembly 10 can be used to face the greater curvature 51 of the blood vessel 50, and the second side 13 can be used to face the lesser curvature 52 of the blood vessel 50. The tubular assembly 20 is disposed at the rear end of the post-release fixation assembly 10 and has a graft cavity for accommodating the stent graft 40, capable of loading the compressed stent graft 40. The guide head 30 is arranged at the front end of the rear-release fixing component 10 and has a guiding function. It can reduce the friction resistance with the inner wall of the blood vessel 50 and ensure that the device can smoothly pass through the complex and curved blood vessel 50 structure.

[0034] It is understood that the stent transport device of the present application can be used to transport a coated stent 40 into a blood vessel 50. When using the stent transport device, the coated stent 40 can be pressed and gripped into the coated cavity of the tube assembly 20, and the stent ring 41 at the head end of the coated stent 40 is limited and fixed to each fixing anchor point 11 of the rear-release fixing assembly 10, and then the coated stent 40 is transported and released. In the present application, by controlling the distance between the fixing anchor point 11 near the first side 12 of the rear-release fixing assembly 10 and the rear end face of the rear-release fixing assembly 10 to be greater than the distance between the fixing anchor point 11 near the second side 13 of the rear-release fixing assembly 10 and the rear end face of the rear-release fixing assembly 10, the stent ring 41 near the second side 13 has the freedom to slide toward the rear end of the rear-release fixing assembly 10. When the stent ring 41 near the first side 12 is limited and fixed, the stent ring 41 near the second side 13 can still slide toward the rear end.

[0035] In this way, Figure 6 As shown, after the coated stent 40 is implanted in the blood vessel 50, when the sheath is withdrawn, the coated stent 40 slides toward the rear end under the action of external force, but under the limiting action of the fixed anchor point 11, the coated stent 40 as a whole is close to the large curvature side 51 of the blood vessel 50, and because the stent ring 41 close to the second side 13 has the freedom to slide toward the rear end, the stent ring 41 close to the second side 13 is driven to slide further toward the rear end, and the coated stent 40 close to the second side 13 retreats backward, reducing the upward warping of the stent ring 41 at the head end of the coated stent 40 due to the action of external force, so that the head end of the coated stent 40 can better fit with the wall of the blood vessel 50 on the small curvature side 52 of the blood vessel 50, thereby reducing the probability of a "bird's beak" phenomenon after the coated stent 40 is released.

[0036] Alternatively, as Figure 2 and Figure 3As shown, in some embodiments, the rear release fixing assembly 10 may include a fixing body 14 and a plurality of claw arms 15, the fixing body 14 includes a tube body connecting portion 141 and a plurality of claw arm connecting portions 142, the claw arm connecting portion 142 is circumferentially protruded from the side surface of the tube body connecting portion 141, and the claw arm 15 extends from the claw arm connecting portion 142 to the front end of the tube body connecting portion 141 along an axial direction parallel to the tube body connecting portion 141, the distance between the front surface of the claw arm connecting portion 142 near the first side 12 and the rear end surface of the tube body connecting portion 141 is greater than the distance between the front surface of the claw arm connecting portion 142 near the second side 13 and the rear end surface of the tube body connecting portion 141, and the fixing anchor points 11 are respectively arranged on the front surfaces of the claw arm connecting portions 142. In this way, the bracket ring 41 of the coated bracket 40 can pass through the claw arm 15 and hang on the front surface of the claw arm connecting part 142. The claw arm connecting part 142 cooperates with the claw arm 15 to achieve limited fixation, and the front surface of the claw arm connecting part 142 close to the second side 13 is closer to the rear end face of the fixed tube body connecting part 141, which can enable the bracket ring 41 close to the second side 13 to have the freedom to slide backward, so as to reduce the probability of the "bird's beak" phenomenon after the coated bracket 40 is released.

[0037] Preferably, if Figure 2 and Figure 3 As shown, in some embodiments, the front surface of the claw arm connecting portion 142 is connected to the front surface of the tube connecting portion 141. In this way, when the bracket ring 41 is passed through the claw arm 15, the tube connecting portion 141 can be prevented from interfering with the bracket ring 41, reducing the radial dimension of the claw arm connecting portion 142, which is conducive to the miniaturization of the rear release fixation assembly 10.

[0038] In particular, the radial dimension of the claw arm connecting portion 142 can be set to zero, that is, the fixed body 14 does not include the claw arm connecting portion 142, and the claw arm 15 is directly connected to the front surface of the tube body connecting portion 141. Figure 5As shown, in some embodiments, the rear release fixing assembly 10 may include a fixing body 14 and a plurality of claw arms 15, the fixing body 14 includes a tube body connecting portion 141, the claw arms 15 extend from the tube body connecting portion 141 toward the front end of the tube body connecting portion 141 along an axial direction parallel to the tube body connecting portion 141, the distance between the front surface of the tube body connecting portion 141 near the first side 12 and the rear end surface of the tube body connecting portion 141 is greater than the distance between the front surface of the tube body connecting portion 141 near the second side 13 and the rear end surface of the tube body connecting portion 141, and the fixing anchor point 11 is arranged on the front surface of the tube body connecting portion 141. In this way, the bracket ring 41 of the coated bracket 40 can pass through the claw arm 15 and be hung on the front surface of the tube body connection part 141, and the tube body connection part 141 cooperates with the claw arm 15 to achieve limited fixation; and the front surface of the tube body connection part 141 close to the second side 13 is closer to the rear end face of the fixed tube body connection part 141, which can enable the bracket ring 41 close to the second side 13 to have the freedom to slide backward, so as to reduce the probability of the "bird's beak" phenomenon after the coated bracket 40 is released.

[0039] Optionally, when the front surface of the claw arm connecting portion 142 is connected to the front end surface of the tube connecting portion 141 or the claw arm 15 is directly connected to the front end surface of the tube connecting portion 141, the shape of the front end surface of the tube connecting portion 141 can be controlled to achieve a control so that the distance between the fixing anchor point 11 near the first side 12 and the rear end surface of the rear-release fixing assembly 10 is greater than the distance between the fixing anchor point 11 near the second side 13 and the rear end surface of the rear-release fixing assembly 10. For example, the front end surface of the fixing body 14 can be tilted, or multiple front end surfaces can be provided.

[0040] Alternatively, as Figure 2 and Figure 3 As shown, in some embodiments, the front end surface of the tube connecting portion 141 extends obliquely from the first side 12 toward the rear end surface of the tube connecting portion 141 to the second side 13, so that the distance between each fixed anchor point 11 and the rear end surface of the tube connecting portion 141 is distributed in a step-like manner, decreasing from the first side 12 to the second side 13. This allows the degree of freedom of the stent ring 41 to slide rearward to increase from the first side 12 to the second side 13. In this way, because the front-to-back length of the vessel 50 wall gradually decreases from the greater curvature 51 to the lesser curvature 52 of the vessel 50, the distance that the stent ring 41 slides rearward to gradually increase from the first side 12 to the second side 13 during sheath removal. This allows for more uniform control of the upward tilt of the stent ring 41, allowing the stent graft 40 on the lesser curvature 52 to better fit the vessel 50 wall.

[0041] Alternatively, as Figure 4As shown, in some embodiments, the front end surface of the tube connecting portion 141 includes a first front end surface near the first side 12 and a second front end surface near the second side 13. The distance between the first front end surface and the rear end surface of the tube connecting portion 141 is greater than the distance between the second front end surface and the rear end surface of the tube connecting portion 141, so that the minimum distance between the fixed anchor point 11 near the first side 12 and the rear end surface of the tube connecting portion 141 is greater than the distance between the fixed anchor point 11 near the second side 13 and the rear end surface of the tube connecting portion 141. In this way, during sheath removal, the stent ring 41 near the first side 12 is restricted from sliding rearward or slides rearward a small distance, allowing the stent graft 40 near the first side 12 to conform to the greater curvature 51; the stent ring 41 near the second side 13 slides rearward a larger distance, allowing the stent graft 40 near the second side 13 to conform to the wall of the blood vessel 50 on the lesser curvature 52.

[0042] In some embodiments, the front ends of the claw arms 15 are kept flush, which facilitates assembly of the guide head 30. The length of the claw arms 15 near the second side 13 is at least twice the length of the claw arms 15 near the first side 12. When the front ends of the claw arms 15 are kept flush, the length of the claw arms 15 can generally represent the sliding distance of the support ring 41. By controlling the length ratio of the claw arms 15 to be sufficiently large, it is possible to ensure that the support ring 41 near the second side 13 has sufficient freedom to slide toward the rear end, so that the support ring 41 has a sufficient adjustable range to address the "bird's beak" phenomenon.

[0043] Since the diameter of the fixing body 14 is often smaller than the diameter of the stent ring 41 at the head end of the stent graft 40, the stent ring 41 is usually kept at an oblique rearward angle when it is fixed to the fixing anchor point 11. Figure 2 and Figure 4 As shown, in some embodiments, the front surface of the claw arm connecting portion 142 extends obliquely from the fixing body 14 in a direction away from the rear end surface of the fixing body 14 to the claw arm 15. In other words, the front surface of the claw arm connecting portion 142 is tilted so that the outer side of the front surface of the claw arm connecting portion 142 is closer to the front end, and the inner side of the front surface of the claw arm connecting portion 142 is closer to the rear end. In this way, by tilting the front surface of the claw arm connecting portion 142, the front surface of the claw arm connecting portion 142 can be more closely aligned with the support ring 41, thereby maintaining a tight positional fixation between the rear-release fixing assembly 10 and the support ring 41 during sheath withdrawal.

[0044] Furthermore, in some embodiments, the front surface of the claw arm connecting portion 142 may also be implemented as a curved surface, which can also enable the bracket contact surface to fit more closely with the bracket ring 41 .

[0045] On the other hand, Figure 1As shown, in some embodiments, the fixing body 14 is provided with a through hole extending along the axis of the fixing body 14; the tube assembly 20 includes an inner core tube 21, a core tube 22, a top tube 23, and a sheath tube 24, which are arranged in sequence from the inside to the outside. The top tube 23 can be used to drive the tube assembly 20 into the blood vessel 50. The top tube 23 and the sheath tube 24 are spaced apart to form a coating cavity, which can accommodate the crimped coated stent 40; the core tube 22 is connected to the rear end of the fixing body 14, and the inner core tube 21 is connected to the guide head 30 through the through hole, so that the fixing assembly, the rear-release fixing assembly 10, and the guide head 30 form a fixed whole.

[0046] It is understood that after the stent graft 40 is delivered to the target location, when the sheath is withdrawn, the top tube 23 can be kept stationary and the sheath 24 can be withdrawn, releasing the stent graft 40 between the top tube 23 and the sheath 24. At this time, the stent graft 40 is affected by friction and tends to slide toward the rear end. However, due to the limiting and fixing effect of the fixed anchor point 11, the stent graft 40 near the greater curvature 51 of the blood vessel 50 is entirely adhered to the wall of the blood vessel 50 on the greater curvature 51, and the stent graft 40 near the lesser curvature 52 of the blood vessel 50 slides toward the rear end and adheres to the wall of the blood vessel 50 on the lesser curvature 52. After the sheath 24 is detached, the other components of the delivery device are withdrawn from the blood vessel 50.

[0047] In some embodiments, as Figure 1 As shown, the guide head 30 includes an introduction portion 31 and a clamping portion 32 connected to the introduction portion 31. The diameter of the introduction portion 31 gradually increases from the front end to the rear end of the introduction portion 31. This streamlines the introduction portion 31, reducing membrane resistance with the wall of the blood vessel 50 and providing a guiding function, allowing the delivery device to smoothly pass through the complex and curved structure of the blood vessel 50. The diameter of the clamping portion 32 is smaller than the rear end diameter of the introduction portion 31. The clamping portion 32 is clamped into the clamping interface formed by the claw arms 15, allowing the guide head 30 to block the clamping interface formed by the claw arms 15, thereby preventing the stent ring 41 from sliding forward out of the claw arms 15 and creating a safety hazard.

[0048] 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.

[0049] 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 stent transport device for transporting a covered stent into a blood vessel, characterized in that: include: a rear-release fixing assembly, wherein the rear-release fixing assembly has a plurality of fixing anchors arranged circumferentially, the fixing anchors being used to limit and fix the stent ring of the coated stent, the distance between the fixing anchor near the first side of the rear-release fixing assembly and the rear end surface of the rear-release fixing assembly being greater than the distance between the fixing anchor near the second side of the rear-release fixing assembly and the rear end surface of the rear-release fixing assembly; wherein the first side and the second side are opposite sides of the rear-release fixing assembly in the circumferential direction; the rear-release fixing assembly comprises a fixing body and a plurality of claw arms, the fixing body comprises a tube body connecting portion and a plurality of claw arm connecting portions, the claw arm connecting portion is circumferentially protruded from the side surface of the tube body connecting portion, the claw arms extend from the claw arm connecting portion along a direction parallel to the axis of the tube body connecting portion toward the front end of the tube body connecting portion, the distance between the front surface of the claw arm connecting portion near the first side and the rear end surface of the tube body connecting portion is greater than the distance between the front surface of the claw arm connecting portion near the second side and the rear end surface of the tube body connecting portion, and the fixing anchors are respectively arranged on the front surfaces of the claw arm connecting portions; a tubular body assembly, the tubular body assembly being disposed at the rear end of the rear-release fixation assembly and having a graft cavity for accommodating a graft stent; and A guide head is arranged at the front end of the rear release fixing assembly.

2. The bracket transport device according to claim 1, characterized in that: The front surface of the claw arm connecting portion is connected to the front surface of the tube body connecting portion.

3. The bracket transport device according to claim 2, characterized in that: The front end surface of the tube connecting portion extends obliquely from the first side toward the rear end surface of the tube connecting portion to the second side.

4. The bracket transport device according to claim 2, characterized in that: The front end face of the tube body connecting portion includes a first front end face close to the first side and a second front end face close to the second side, and the distance between the first front end face and the rear end face of the tube body connecting portion is greater than the distance between the second front end face and the rear end face of the tube body connecting portion.

5. The bracket transport device according to claim 2, characterized in that: The front ends of the claw arms are kept flush, and the length of the claw arm close to the second side is at least twice the length of the claw arm close to the first side.

6. The bracket transport device according to claim 1 or 2, characterized in that: The front surface of the claw arm connecting portion extends obliquely from the fixing body in a direction away from the rear end surface of the fixing body to the claw arm.

7. The bracket transport device according to claim 2, characterized in that: The fixed body is provided with a through hole which passes through along the axial direction of the fixed body; the tube body assembly includes an inner core tube, a core tube, a top tube and a sheath tube which are arranged in sequence from the inside to the outside, and the top tube and the sheath tube are arranged at intervals to form the coating cavity; the core tube is connected to the rear end of the fixed body, and the inner core tube is connected to the guide head through the through hole.

8. The bracket transport device according to claim 1 or 2, characterized in that: The guide head includes an introduction part and a clamping part connected to the introduction part. The diameter of the introduction part gradually increases from the front end to the rear end of the introduction part. The diameter of the clamping part is smaller than the rear end diameter of the introduction part. The clamping part is clamped in the clamping interface formed by each claw arm.

9. A stent transport device for transporting a covered stent into a blood vessel, characterized in that: include:

18. The rear-release fixing assembly of claim 17, wherein the rear-release fixing assembly comprises a plurality of fixing anchors arranged circumferentially, the fixing anchors being used to limit and fix the stent ring of the coated stent, the distance between the fixing anchor near a first side of the rear-release fixing assembly and the rear end face of the rear-release fixing assembly being greater than the distance between the fixing anchor near a second side of the rear-release fixing assembly and the rear end face of the rear-release fixing assembly; wherein the first side and the second side are opposite sides of the rear-release fixing assembly in a circumferential direction; the rear-release fixing assembly comprises a fixing body and a plurality of claw arms, the fixing body comprises a tube body connecting portion, the claw arms extending from the tube body connecting portion toward the front end of the tube body connecting portion along an axial direction parallel to the tube body connecting portion, the distance between the front surface of the tube body connecting portion near the first side and the rear end face of the tube body connecting portion being greater than the distance between the front surface of the tube body connecting portion near the second side and the rear end face of the tube body connecting portion, and the fixing anchors are arranged on the front surface of the tube body connecting portion; a tubular body assembly, the tubular body assembly being disposed at the rear end of the rear-release fixation assembly and having a graft cavity for accommodating a graft stent; and A guide head is arranged at the front end of the rear release fixing assembly.

10. The bracket transport device according to claim 9, characterized in that: The front end surface of the tube connecting portion extends obliquely from the first side toward the rear end surface of the tube connecting portion to the second side.

11. The bracket transport device according to claim 9, characterized in that: The front end face of the tube body connecting portion includes a first front end face close to the first side and a second front end face close to the second side, and the distance between the first front end face and the rear end face of the tube body connecting portion is greater than the distance between the second front end face and the rear end face of the tube body connecting portion.

12. The bracket transport device according to claim 9, characterized in that: The front ends of the claw arms are kept flush, and the length of the claw arm close to the second side is at least twice the length of the claw arm close to the first side.

13. The bracket transport device according to claim 9, characterized in that: The fixed body is provided with a through hole which passes through along the axial direction of the fixed body; the tube body assembly includes an inner core tube, a core tube, a top tube and a sheath tube which are arranged in sequence from the inside to the outside, and the top tube and the sheath tube are arranged at intervals to form the coating cavity; the core tube is connected to the rear end of the fixed body, and the inner core tube is connected to the guide head through the through hole.

14. The bracket transport device according to claim 9, characterized in that: The guide head includes an introduction part and a clamping part connected to the introduction part. The diameter of the introduction part gradually increases from the front end to the rear end of the introduction part. The diameter of the clamping part is smaller than the rear end diameter of the introduction part. The clamping part is clamped in the clamping interface formed by each claw arm.

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