Support transporting device

Abstract

The invention relates to a stent conveying device which is used for conveying a covered stent into a blood vessel and comprises a rear release fixing assembly, a tube body assembly and a guide head. The rear release fixing assembly is provided with a plurality of fixing anchor points arranged in the circumferential direction, and the fixing anchor points are used for limiting and fixing a stent ring of the covered stent. The distance between the fixing anchor point close to the first side of the rear release fixing assembly and the rear end face of the rear release fixing assembly is larger than the distance between the fixing anchor point close to the second side of the rear release fixing assembly and the rear end face of the rear release fixing assembly, so that the support ring close to the second side has the freedom degree of sliding towards the rear end of the rear release fixing assembly. When the stent ring close to the first side is limited and fixed, the stent ring close to the second side can still slide towards the rear end, the phenomenon that the stent ring at the head end of the covered stent warps upwards under the action of external force can be reduced, and the probability that the'beak 'phenomenon occurs after the covered stent is released is reduced.

Description

Technical Field

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

[0002] In recent years, with the continuous development of endovascular interventional surgery, thoracic endovascular aortic repair has been increasingly applied to the clinical treatment of aortic aneurysms and aortic dissections due to its advantages such as safety, minimally invasive, and quick recovery.

[0003] The main pathogenic cause of aortic aneurysm is that the vascular wall strength or elasticity of some parts of the blood vessels is insufficient, resulting in abnormal collisions or stretches of the vascular wall when blood passes through. It is more common in the abdominal aorta and thoracic aorta, while aortic dissection is more common in the thoracic aorta. In order to inhibit the continuous tearing of aortic dissection and prevent the rupture of aneurysms, current clinical treatment methods mostly adopt interventional surgery. Usually, a covered stent graft is used in combination with a delivery system, and the stent is placed at the diseased position through an access method to achieve the effect of closing the false lumen or aneurysm cavity.

[0004] At present, the main method in the market is sheath withdrawal release. The delivery system releases the overall structure of the covered stent by withdrawing the sheath tube. After the overall release of the covered stent, the proximal stent ring of the covered stent is released through a post-release fixing device, thereby achieving the precise release of the stent. However, due to the relatively complex structural form of the aortic blood vessels, and during the release process, due to the presence of the guide wire, the delivery sheath tube adheres to the large curvature side of the blood vessel. Coupled with the constraint of the proximal end of the covered stent by the post-release device on the stent, the adhesion between the proximal end of the covered stent and the blood vessel wall on the small curvature side of the blood vessel is poor after the covered stent is released, resulting in the proximal end of the covered stent being prone to the "bird's beak" phenomenon, and further causing complications such as endoleakage, displacement, and stent-induced new rupture. Summary of the Invention

[0005] Based on this, it is necessary to provide a stent transportation device to solve the problem of the "bird's beak" phenomenon that is likely to occur due to the poor adhesion between the proximal end of the covered stent and the blood vessel wall on the small curvature side of the blood vessel.

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

[0007] After releasing the posterior release fixing component, the posterior release fixing component has a plurality of fixing anchor points arranged circumferentially, and the fixing anchor points are used to limit and fix the stent ring of the covered stent. The distance between the fixing anchor point close to the first side of the posterior release fixing component and the rear end face of the posterior release fixing component is greater than the distance between the fixing anchor point close to the second side of the posterior release fixing component and the rear end face of the posterior release fixing component; wherein, the first side and the second side are opposite sides in the circumferential direction of the posterior release fixing component; a tube body component, the tube body component is arranged at the rear end of the posterior release fixing component and has a covered cavity for accommodating the covered stent; and a guiding head, the guiding head is arranged at the front end of the posterior release fixing component.

[0008] In one embodiment, the posterior release fixing component includes a fixing main body and a plurality of claw arms. The fixing main body includes a tube body connecting portion and a plurality of claw arm connecting portions. The claw arm connecting portions protrude circumferentially from the side surface of the tube body connecting portion. The claw arms extend from the claw arm connecting portions along the axis direction parallel to the tube body connecting portion towards the front end of 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 face 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 face of the tube body connecting portion. 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 body connecting portion.

[0010] In one embodiment, the posterior release fixing component includes a fixing main body and a plurality of claw arms. The fixing main body includes a tube body connecting portion. The claw arms extend from the tube body connecting portion along the axis direction parallel to the tube body connecting portion towards the front end of 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 face 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 face of the tube body connecting portion. The fixing anchor points are arranged on the front surface of the tube body connecting portion.

[0011] In one embodiment, the front end face of the tube body connecting portion extends obliquely from the first side towards the rear end face of the tube body 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. 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 respective claw arms are 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 fixed main body in a direction deviating from the rear end surface of the fixed main body to the claw arm.

[0015] In one embodiment, the fixed main body is provided with a through hole penetrating in the axial direction of the fixed main body; the tube assembly includes an inner core tube, a core tube, a top tube and a sheath tube arranged in sequence from inside to outside, and the top tube and the sheath tube are spaced apart to form the film covering cavity; the core tube is connected to the rear end of the fixed main body, and the inner core tube passes through the through hole and is connected to the guiding head.

[0016] In one embodiment, the guiding head includes an introducing portion and a clamping portion connected to the introducing portion. The diameter of the introducing portion gradually increases from the front end to the rear end of the introducing portion, the diameter of the clamping portion is smaller than the rear end diameter of the introducing portion, and the clamping portion is clamped in the clamping interface formed by surrounding the respective claw arms.

[0017] The stent transportation device of the present application can be used to transport the covered stent into the blood vessel. When using the stent transportation device, the covered stent can be pressed and held in the film covering cavity of the tube assembly, and the stent rings at the head end of the covered stent are limited and fixed to each fixing anchor point of the rear release fixing component, and then the covered stent is transported and released.

[0018] By controlling the distance between the fixing anchor point close to the first side of the rear release fixing component and the rear end surface of the rear release fixing component to be greater than the distance between the fixing anchor point close to the second side of the rear release fixing component and the rear end surface of the rear release fixing component, the present application enables the stent ring close to the second side to have the freedom to slide backward to the rear end of the rear release fixing component. When the stent ring close to the first side is limited and fixed, the stent ring close to the second side can still slide backward. After the covered stent is implanted into the blood vessel and the sheath is withdrawn, the covered stent slides backward under the action of external force, but under the limiting action of the fixing anchor point, the whole covered stent is close to the large curvature side of the blood vessel. Since the stent ring close to the second side has the freedom to slide backward to the rear end, the stent ring close to the second side is driven to further slide backward to the rear end, and the covered stent close to the second side retreats backward, reducing the upward warping of the stent ring at the head end of the covered stent under the action of external force, so that the head end of the covered stent can better fit the blood vessel wall on the small curvature side of the blood vessel, thereby reducing the probability of the "bird's beak" phenomenon occurring after the covered stent is released. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 2 A plan schematic view showing a rear release fixing assembly of a first example of a stent delivery device according to the above embodiments of the present application;

[0021] Figure 3 A three-dimensional schematic view showing a rear release fixing assembly of a first example of a stent delivery device according to the above embodiments of the present application;

[0022] Figure 4 A plan schematic view showing a rear release fixing assembly of a second example of a stent delivery device according to the above embodiments of the present application;

[0023] Figure 5 A three-dimensional schematic view showing a rear release fixing assembly of a second example of a stent delivery device according to the above embodiments of the present application;

[0024] Figure 6 A schematic view showing the stent delivery device according to the above embodiments of the present application when releasing a covered stent in a blood vessel.

[0025] Reference numerals: 10, rear release fixing assembly; 11, fixing anchor point; 12, first side; 13, second side; 14, fixing main body; 141, tube connection part; 142, claw arm connection part; 15, claw arm; 20, tube assembly; 21, inner core tube; 22, core tube; 23, top tube; 24, sheath tube; 30, guiding head; 31, introducing part; 32, clamping part; 40, covered stent; 41, stent ring; 50, blood vessel; 51, major curvature side; 52, minor curvature side. Detailed Description of the Invention

[0026] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0027] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 thus should not be construed as a limitation to the present invention.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0029] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height 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 can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0032] Based on the problem that in current interventional therapy, after the release of the covered stent, the "beak" phenomenon is likely to occur due to the poor adhesion of the covered stent to the blood vessel wall on the small curvature side of the proximal end of the blood vessel, the present application provides a stent delivery device that can solve the "beak" phenomenon generated after the release of the covered stent.

[0033] Specifically, please refer to Figure 1 and Figure 2 , the stent delivery device of the present application may include a post-release fixing component 10, a tube body component 20 and a guiding head 30. The post-release fixing component 10 has a plurality of fixing anchors 11 arranged circumferentially. The fixing anchors 11 are used to limit and fix the stent rings 41 of the covered stent 40. The distance between the fixing anchor 11 near the first side 12 of the post-release fixing component 10 and the rear end face of the post-release fixing component 10 is greater than the distance between the fixing anchor 11 near the second side 13 of the post-release fixing component 10 and the rear end face of the post-release fixing component 10. Among them, the first side 12 and the second side 13 are opposite sides in the circumferential direction of the post-release fixing component 10. When delivering the covered stent 40, the first side 12 of the post-release fixing component 10 can be used to face the large curvature side 51 of the blood vessel 50, and the second side 13 can be used to face the small curvature side 52 of the blood vessel 50. The tube body component 20 is arranged at the rear end of the post-release fixing component 10 and has a covered cavity for accommodating the covered stent 40, and can load the compressed covered stent 40. The guiding head 30 is arranged at the front end of the post-release fixing component 10 and has a guiding function, which can reduce the frictional resistance with the inner wall of the blood vessel 50 and ensure that the device can smoothly pass through the complex curved blood vessel 50 structure.

[0034] It can be understood that the stent transportation device of the present application can be used to transport the covered stent 40 into the blood vessel 50. When using this stent transportation device, the covered stent 40 can be pressed and held into the covered cavity of the tube body assembly 20, and the stent ring 41 at the head end of the covered stent 40 can be limited and fixed to each fixing anchor point 11 of the post-release fixing assembly 10, and then the covered stent 40 can be transported and released. By controlling the distance between the fixing anchor point 11 near the first side 12 of the post-release fixing assembly 10 and the rear end face of the post-release fixing assembly 10 to be greater than the distance between the fixing anchor point 11 near the second side 13 of the post-release fixing assembly 10 and the rear end face of the post-release fixing assembly 10, the stent ring 41 near the second side 13 is given the freedom to slide backward towards the rear end of the post-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 backward towards the rear end.

[0035] Thus, as Figure 6 shown, after the covered stent 40 is implanted into the blood vessel 50 and the sheath is withdrawn, when the covered stent 40 slides backward under the action of an external force, but under the limiting action of the fixing anchor point 11, the whole covered stent 40 closely adheres to the large curvature side 51 of the blood vessel 50. Since the stent ring 41 near the second side 13 has the freedom to slide backward towards the rear end, the stent ring 41 near the second side 13 is driven to further slide backward towards the rear end, and the covered stent 40 near the second side 13 retreats backward, reducing the upward warping of the stent ring 41 at the head end of the covered stent 40 under the action of an external force, enabling the head end of the covered stent 40 to better fit the wall of the blood vessel 50 at the small curvature side 52 of the blood vessel 50, thereby reducing the probability of the "bird's beak" phenomenon occurring after the covered stent 40 is released.

[0036] Optionally, 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 protruding from the side surface of the tube body connecting portion 141, 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 support ring 41 of the coated support 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 surface of the fixed tube body connecting part 141, which can enable the support 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 support 40 is released.

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

[0038] In particular, the radial dimension of the claw arm connection portion 142 can be set to zero, that is, the fixed body 14 does not include the claw arm connection portion 142, and the claw arm 15 is directly connected to the front surface of the tube body connection 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 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 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 support ring 41 of the coated support 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 surface of the fixed tube body connection part 141, which can enable the support 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 support 40 is released.

[0039] Optionally, when the front surface of the claw arm connection part 142 is connected to the front end surface of the tube body connection part 141 or the claw arm 15 is directly connected to the front surface of the tube body connection part 141, the distance between the fixed anchor point 11 near the first side 12 and the rear end surface of the rear release fixing component 10 can be controlled to be greater than the distance between the fixed anchor point 11 near the second side 13 and the rear end surface of the rear release fixing component 10 by controlling the shape of the front surface of the tube body connection part 141. For example, the front end surface of the fixing body 14 is tilted, or multiple front end surfaces are provided.

[0040] Alternatively, if Figure 2 and Figure 3 As shown, in some embodiments, the front end face of the tube body connection part 141 extends obliquely from the first side 12 to the direction close to the rear end face of the tube body connection part 141 to the second side 13, so that the distance between each fixed anchor point 11 and the rear end face of the tube body connection part 141 is gradually reduced from the first side 12 to the second side 13 in a step-like distribution, so that the freedom of the stent ring 41 to slide toward the rear end increases from the first side 12 to the second side 13. In this way, since the front-to-back length of the wall of the blood vessel 50 gradually decreases from the greater curvature side 51 to the lesser curvature side 52 of the blood vessel 50, when the sheath is withdrawn, the distance of the stent ring 41 sliding toward the rear end gradually increases from the first side 12 to the second side 13, which can more evenly control the upward tilt of the stent ring 41, so that the coated stent 40 on the lesser curvature side 52 fits the wall of the blood vessel 50 better.

[0041] Alternatively, if Figure 4As shown, in some embodiments, the front end face of the tube body connecting portion 141 includes a first front end face close to the first side 12 and a second front end face close to the second side 13. The distance between the first front end face and the rear end face of the tube body connecting portion 141 is greater than the distance between the second front end face and the rear end face of the tube body connecting portion 141, so that the minimum distance between the fixing anchor 11 close to the first side 12 and the rear end face of the tube body connecting portion 141 is greater than the distance between the fixing anchor 11 close to the second side 13 and the rear end face of the tube body connecting portion 141. In this way, when withdrawing the sheath, the stent ring 41 close to the first side 12 is restricted from sliding backward or slides backward a small distance, so that the covered stent 40 close to the first side 12 fits the large curvature side 51; the stent ring 41 close to the second side 13 slides backward a large distance, so that the covered stent 40 close to the second side 13 fits the blood vessel 50 wall of the small curvature side 52.

[0042] In some embodiments, the front ends of the respective claw arms 15 are kept flush, which facilitates the assembly of the guiding head 30. The length of the claw arm 15 close to the second side 13 is at least twice the length of the claw arm 15 close to 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 stent ring 41. By controlling the length ratio of the claw arms 15 to be large enough, it can be ensured that the stent ring 41 close to the second side 13 has sufficient freedom to slide backward, so that the stent ring 41 has sufficient adjustable range to cope with 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 covered stent 40, when the stent ring 41 is limited and fixed to the fixing anchor 11, it usually maintains an obliquely backward angle. Therefore, as Figure 2 and Figure 4 shown, in some embodiments, the front surface of the claw arm connecting portion 142 extends obliquely from the fixing body 14 in a direction deviating from the rear end face of the fixing body 14 to the claw arm 15. In other words, the front surface of the claw arm connecting portion 142 is obliquely arranged, 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 obliquely arranging the front surface of the claw arm connecting portion 142, the front surface of the claw arm connecting portion 142 can be made to fit the stent ring 41 better, so that when withdrawing the sheath, the limit fixation of the rear release fixing component 10 and the stent ring 41 is kept tight.

[0044] In addition, in some embodiments, the front surface of the claw arm connecting portion 142 can also be implemented as an arc surface, which can also make the stent contact surface fit the stent ring 41 better.

[0045] On the other hand, as Figure 1As shown, in some embodiments, the fixing body 14 is provided with a through hole penetrating along the axis direction of the fixing body 14; the tube assembly 20 includes an inner core tube 21, a core tube 22, a push tube 23, and a sheath tube 24 which are arranged in sequence from inside to outside. The push tube 23 can be used to drive the tube assembly 20 into the blood vessel 50. The push tube 23 and the sheath tube 24 are arranged at intervals to form a film cavity capable of loading the crimped film stent 40; the core tube 22 is connected to the rear end of the fixing body 14, and the inner core tube 21 passes through the through hole and is connected to the guiding head 30, so that the fixing assembly, the rear release fixing assembly 10, and the guiding head 30 form a fixed whole.

[0046] It can be understood that when the film stent 40 is delivered to the target position, when withdrawing the sheath, the push tube 23 can be kept stationary first, the sheath tube 24 can be withdrawn, and the film stent 40 between the push tube 23 and the sheath tube 24 can be released. At this time, the film stent 40 has a tendency to slide backward under the influence of friction. However, due to the limiting and fixing effect of the fixing anchor point 11, the whole film stent 40 near the major curvature side 51 of the blood vessel 50 fits the blood vessel 50 wall of the major curvature side 51, and the film stent 40 near the minor curvature side 52 of the blood vessel 50 slides backward and fits the blood vessel 50 wall of the minor curvature side 52. After the sheath tube 24 is detached, other components of the delivery device can be withdrawn from the blood vessel 50.

[0047] In some embodiments, as Figure 1 shown, the guiding head 30 includes a guiding-in part 31 and a clamping part 32 connected to the guiding-in part 31. The diameter of the guiding-in part 31 gradually increases from the front end to the rear end of the guiding-in part 31. In this way, the guiding-in part 31 presents a streamlined design, which can reduce the film layer resistance with the blood vessel 50 wall and can achieve a guiding effect, so that the delivery device can smoothly pass through the complex and curved blood vessel 50 structure. The diameter of the clamping part 32 is smaller than the rear end diameter of the guiding-in part 31, and the clamping part 32 is clamped in the clamping interface formed by surrounding of each claw arm 15, so that the guiding head 30 can block the clamping interface formed by surrounding of each claw arm 15 to prevent the stent ring 41 from sliding forward out of the claw arm 15 and generating potential safety hazards.

[0048] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0049] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A stent transportation device for transporting a covered stent into a blood vessel, characterized in that, Comprising: A post-release fixing component having a plurality of fixing anchors circumferentially arranged, the fixing anchors being used to limit and fix the stent rings of the covered stent, the distance between the fixing anchor near the first side of the post-release fixing component and the rear end face of the post-release fixing component being greater than the distance between the fixing anchor near the second side of the post-release fixing component and the rear end face of the post-release fixing component; wherein, the first side and the second side are opposite sides in the circumferential direction of the post-release fixing component; A tube body component disposed at the rear end of the post-release fixing component and having a covered cavity for accommodating the covered stent; and A guiding head disposed at the front end of the post-release fixing component.

2. The bracket transportation device according to claim 1, wherein The post-release fixing component includes a fixing body and a plurality of claw arms, the fixing body includes a tube connection part and a plurality of claw arm connection parts, the claw arm connection parts protrude circumferentially from the side surface of the tube connection part, the claw arms extend from the claw arm connection parts along a direction parallel to the axis of the tube connection part towards the front end of the tube connection part, the distance between the front surface of the claw arm connection part near the first side and the rear end face of the tube connection part is greater than the distance between the front surface of the claw arm connection part near the second side and the rear end face of the tube connection part, and the fixing anchors are respectively disposed on the front surfaces of the claw arm connection parts.

3. The stent transportation device according to claim 2, wherein, The front surface of the claw arm connection part is connected to the front surface of the tube connection part.

4. The stent transportation device according to claim 1, characterized in that, The post-release fixing component includes a fixing body and a plurality of claw arms, the fixing body includes a tube connection part, the claw arms extend from the tube connection part along a direction parallel to the axis of the tube connection part towards the front end of the tube connection part, the distance between the front surface of the tube connection part near the first side and the rear end face of the tube connection part is greater than the distance between the front surface of the tube connection part near the second side and the rear end face of the tube connection part, and the fixing anchors are disposed on the front surface of the tube connection part.

5. The stent transportation device according to claim 3 or claim 4, characterized in that, The front end face of the tube connection part extends obliquely from the first side towards the direction close to the rear end face of the tube connection part to the second side.

6. The stent transportation device according to claim 3 or claim 4, characterized in that The front end face of the tube connection part includes a first front end face near the first side and a second front end face near the second side, the distance between the first front end face and the rear end face of the tube connection part is greater than the distance between the second front end face and the rear end face of the tube connection part.

7. The support transportation device according to claim 3 or claim 4, characterized in that The front ends of the respective claw arms are kept flush, and the length of the claw arm near the second side is at least twice the length of the claw arm near the first side.

8. The stent transportation device according to claim 2 or claim 3, characterized in that, The front surface of the claw arm connection part extends obliquely from the fixing body towards the direction deviating from the rear end face of the fixing body to the claw arm.

9. The stent transportation device according to claim 3 or claim 4, characterized in that, The fixing body is provided with a through hole penetrating along the axis direction of the fixing body; the tube body component includes an inner core tube, a core tube, a top tube and a sheath tube sequentially arranged from inside to outside, the top tube and the sheath tube are arranged at intervals to form the covered cavity; the core tube is connected to the rear end of the fixing body, and the inner core tube passes through the through hole and is connected to the guiding head.

10. The stent transportation device according to any one of claims 2 to 4, characterized in that, The guiding 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 diameter of the rear end of the introduction part. The clamping part is clamped in the clamping opening formed by surrounding each of the claw arms.

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