Rear release structure, stent and stent system

Abstract

The invention relates to a rear release structure, a support and a support system, the rear release structure comprises a supporting component and a limiting unit, the supporting component is used for sleeving the support, the limiting unit is arranged on the supporting component, and the limiting unit is used for limiting a partial area of the support on the supporting component. According to the rear release structure, the support and the support system, by means of the rear release structure composed of the supporting component and the limiting unit, the support can be limited to the supporting component through the limiting unit and can also be controllably fixed to the supporting component, and the controllability means that the support can be stably limited to the supporting component and does not move unexpectedly; and when the limitation needs to be removed, the stent can be removed from the limitation relative to the supporting part at any time and separated from the supporting part, so that in the implanting process of the stent, the controllable limitation of the post-release structure on the stent can prevent the stent from generating unexpected displacement, and then when the stent is finally released, the limitation on the stent is removed according to time; and the stent is accurately released.

Description

Technical Field

[0001] The present application relates to the field of medical device technology, and in particular to a post-release structure, a stent, and a stent system. Background Art

[0002] Endovascular repair of the aorta, such as thoracic endovascular repair (TEVAR), is an effective means of treating aortic dissection. Compared with open-chest surgery, endovascular repair of the aorta has significant advantages such as less trauma and fewer complications, which has led to the rapid development of endovascular repair of the aorta in the medical field. Endovascular repair of the aorta mainly involves implanting a covered stent to block the rupture of the proximal aortic intima, improve the blood supply to the true lumen, reduce the pressure of the false lumen, induce thrombosis in the false lumen, expand the true lumen of the aorta, form thrombosis in the false lumen, shrink the false lumen and eventually tend to occlusion, thus completing the remodeling of the aortic vascular morphology.

[0003] During the implantation of the covered stent, the covered stent is impacted by the blood flow and is very likely to shift and deviate from the targeted position, which can easily lead to treatment failure. Summary of the invention

[0004] Based on this, it is necessary to provide a rear release structure, a bracket and a bracket system to address the technical problems mentioned above.

[0005] The present application provides a rear release structure, the rear release structure comprising:

[0006] A supporting component, the supporting component is used for fitting the bracket;

[0007] A limiting unit is provided on the supporting component, and is used to limit a partial area of ​​the bracket on the supporting component.

[0008] In one embodiment, the limiting unit comprises:

[0009] a limiting component, wherein the limiting component is arranged on the supporting component;

[0010] A connecting component, the connecting component is arranged on the supporting component, and the connecting component is used to connect with a partial area of ​​the bracket;

[0011] A connecting component is used to connect the connecting component with the limiting component, thereby indirectly limiting a partial area of ​​the bracket on the supporting component.

[0012] In one embodiment, the limiting component includes at least two unit limiting bodies, at least two of the unit limiting bodies are fixedly assembled on the supporting component, and the connecting component is located between two of the unit limiting bodies.

[0013] In one embodiment, the unit limiting body is a limiting collar, the limiting collar is sleeved on the supporting component, and the limiting collar is fixedly connected to the supporting component; and / or,

[0014] The connecting component has a connecting through hole.

[0015] In one embodiment, the connecting component includes a first connecting thread, one end of the first connecting thread is connected to the supporting component, the other end of the first connecting thread is provided with an end connector, and the connecting through hole is provided on the end connector; or,

[0016] The connecting component includes a second connecting thread, both ends of which are connected to the supporting component, so that the connecting through hole is formed by the second connecting thread surrounding.

[0017] In one embodiment, the connecting component is a threading wire, and the threading wire is used to movably pass through the inner ring of the limiting ring and the connecting through hole of the connecting component, thereby connecting the connecting component and at least two of the limiting rings.

[0018] The present application also provides a stent, which has an expanded state and a contracted state, the stent has at least one unit area, the stent is configured to be mounted on the supporting component of the rear release structure, and at least one of the unit areas of the stent is configured to be restricted on the supporting component by a restriction unit of the rear release structure, and the unit area of ​​the stent is restricted to a contracted state.

[0019] In one embodiment, the proximal end of the stent has at least one unit region; or,

[0020] A plurality of the unit regions are disposed at the proximal end of the stent, and the plurality of the unit regions are arranged around the circumference of the stent.

[0021] In one of the embodiments, a connecting member is provided in the unit region of the bracket, and the connecting member is used to indirectly connect the unit region of the bracket with the limiting unit.

[0022] The present application also provides a support system, the support system comprising:

[0023] The post-release structure; or, the stent.

[0024] In the above-mentioned post-release structure, stent and stent system, with the help of the post-release structure composed of the supporting component and the limiting unit, the stent can be limited to the supporting component by the limiting unit, that is, it can be fixed to the supporting component in a controllable manner. The controllability is manifested in that the stent can be stably limited to the supporting component without unexpected movement, and when the restriction needs to be released, the stent can be released from the restriction and separated relative to the supporting component at any time. Therefore, during the implantation process of the coated stent, the restriction of the stent by the post-release structure can prevent the stent from unexpected displacement, and even if it is impacted by blood flow, it can stably maintain the expected position and accurately point to the target position. When the stent is finally released, the restriction on the stent is released according to the timing, so that the stent is accurately released, thereby improving the success rate of treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the usage status structure of the rear release structure provided in one embodiment of the present application.

[0026] Figure 2 This is a schematic diagram of the partial structure of the rear release structure in use state provided in another embodiment of the present application.

[0027] Figure Number:

[0028] 1000, supporting member; 2000, limiting unit; 3000, connecting member;

[0029] 2100, limiting component; 2200, connecting component; 2300, connecting component;

[0030] 2100a, unit limiting body; 2200a, first connecting wire; 2200b, end connecting body; 2200c, second connecting wire. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0032] In the description of the present application, it should be understood that if 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", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, 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 intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that if 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 a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0037] See also Figure 1 As shown, an embodiment of the present application provides a post-release structure, which includes a support component 1000 and a limiting unit 2000. The support component 1000 is used to fit the stent, wherein the stent generally adopts a cylindrical structure that adapts to the shape of the blood vessel. Therefore, in order to be able to stably and well fit the stent, the support component 1000 can be constructed into a structure and shape suitable for fitting the stent according to the structural characteristics of the stent. For example, the support component 1000 adopts a slender structure similar to a rod-like structure, a cylindrical structure, etc., and the support component 1000 can be constructed into a straight shape as a whole, a curved shape, or a combination of a partially straight shape and a partially curved shape according to actual needs. The specific shape is not limited here, and technical personnel in this field can design it according to actual needs, as long as it can ensure that a stable and good supporting foundation and a fitting foundation are provided for the stent.

[0038] In one embodiment, the bracket has a central axis when it is cylindrical, and the support component 1000 has a central axis when it is a straight rod. In this case, the bracket can be mounted on the support component 1000 in a roughly coaxial relative position relationship, wherein the bracket and the support component 1000 are roughly coaxial, wherein the central axis of the bracket and the central axis of the support component 1000 coincide with each other in an ideal case, but the central axis of the bracket and the central axis of the support component 1000 are also allowed to be misaligned within a reasonable error range. Technicians in this field can set the mounting of the bracket relative to the support component 1000 as required, as long as the mounting and restriction of the bracket are ensured to be in a stable state, and there is no limitation on this.

[0039] The limiting unit 2000 is arranged on the supporting component 1000, wherein the limiting unit 2000 may include one or more parts. The assembly of the limiting unit 2000 relative to the supporting component 1000 may also be constructed as a detachable connection or a non-detachable connection according to requirements. The function of the limiting unit 2000 is mainly to limit a partial area of ​​the bracket to the supporting component 1000, while the remaining area of ​​the bracket is not restricted by the supporting component 1000, so that a partial area of ​​the bracket can be connected to the supporting component 1000, and a partial area of ​​the bracket can be restricted to a retracted state when restricted to the supporting component 1000. When the remaining area of ​​the bracket is released, the partial area restricted on the supporting component 1000 still remains connected to the supporting component 1000 and is in a retracted state, so that the partial area of ​​the bracket restricted by the limiting unit 2000 achieves a "post-release" effect.

[0040] It should be noted that the partial area of ​​the bracket is connected to the support component 1000 here, and its main purpose is to limit the movement of the bracket, so that after the support component 1000 provides a support basis for the bracket, the bracket can be restricted on the support component 1000 with the support component 1000 as the support basis, to ensure that the bracket does not move arbitrarily out of control after being restricted. Moreover, the fact that the partial area of ​​the bracket is in a contracted state also means that not the entire structure of the bracket is in a contracted state, but the partial area of ​​the bracket is restricted on the support component 1000. When restricted on the support component 1000, the partial area is restricted to a contracted state because the partial area is connected. The purpose is to restrict the entire bracket from moving arbitrarily by restricting the partial area of ​​the connected bracket.

[0041] One or more unit areas can be constructed on the bracket, so that the constructed unit area at a determined position is a partial area on the bracket that is used to be restricted. Moreover, the unit area can be constructed at different positions of the bracket according to needs. For example, the unit area can be constructed at the distal position of the bracket, the central position of the bracket or the proximal position of the bracket. In one embodiment, the proximal end of the bracket has a unit area, so the proximal position of the bracket can be used to restrict the bracket to the support component 1000, or, in one embodiment, a plurality of unit areas are set at the proximal end of the bracket, and the plurality of unit areas are arranged around the circumference of the bracket, so that the proximal position of the bracket can be completely contracted and restricted to the support component 1000 along the circumference of the bracket.

[0042] Moreover, the limiting connection of the limiting unit 2000 to the unit area of ​​the stent can be in various forms, such as mutual hanging, mutual binding, etc. The purpose of the limiting connection is to limit the stent on the support component 1000 by means of the unit area of ​​the stent, and it can also allow the operator to conveniently release the restriction of the unit area of ​​the stent by the limiting unit 2000 when necessary. The limiting unit 2000 can be directly connected to the corresponding structure in the unit area of ​​the stent, or the limiting unit 2000 can also be indirectly connected to the corresponding structure in the unit area of ​​the stent by means of corresponding components. For example, in one embodiment, the unit area of ​​the stent is provided with a connecting member 3000, and the connecting member 3000 is used to indirectly connect the unit area of ​​the stent with the limiting unit 2000. The connecting member 3000 can be, for example, a structure that can provide connection conditions such as a coil, a stent segment, etc., which can neither hinder the expansion and contraction function of the stent itself, nor provide a structural basis for the limiting unit 2000 to easily connect the stent. Those skilled in the art can select a suitable structure according to needs, and there is no limitation on this.

[0043] Therefore, by means of the post-release structure formed by the support component 1000 and the limiting unit 2000, the stent can be limited to the support component 1000 by the limiting unit 2000, that is, it can be fixed on the support component 1000 in a controllable manner. The controllability is that the stent can be stably limited to the support component 1000 without unexpected movement, and when the restriction needs to be released, the stent can be released from the support component 1000 and separated at any time. Therefore, during the implantation of the coated stent, the restriction of the stent by the post-release structure can prevent the stent from unexpected displacement, and even if it is impacted by the blood flow, it can stably maintain the expected position and accurately point to the target position. When the stent is finally released, the restriction on the stent is released according to the timing, so that the stent is accurately released, thereby improving the success rate of treatment.

[0044] The limiting unit 2000 can be constructed into different structures according to needs. For example, in one embodiment, the limiting unit 2000 includes a limiting component 2100, a connecting component 2200 and a connecting component 2300. The limiting component 2100 is arranged on the supporting component 1000. The function of the limiting component 2100 is to construct a basis for limiting the movement of the bracket on the supporting component 1000, wherein the limiting component 2100 can be fixedly arranged at a preset position of the supporting component 1000, and the connecting component 2200 is arranged on the supporting component 1000. The function of the connecting component 2200 is to be connected to a partial area of ​​the bracket, that is, the connecting component 2200 is connected to the bracket. The unit area and even the connecting members 3000 on the unit area form a connection. The function of the connecting component 2200 is to determine the specific connection position on the support component 1000 after being set at the determined position of the support component 1000, that is, to determine the specific position of the bracket limited to the support component 1000 by utilizing the connection between the connecting component 2200 and the bracket. The connecting component 2300 is used to connect the connecting component 2200 with the limiting component 2100, wherein the bracket is connected to the connecting component 2200, and the connecting component 2300 is connected to the connecting component 2200 and the limiting component 2100 at the same time, thereby indirectly limiting a partial area of ​​the bracket to the support component 1000.

[0045] The limiting component 2100 can be constructed into different structures according to the connection form. For example, the limiting component can be a single component or composed of multiple different separate parts. In one embodiment, the limiting component 2100 includes at least two unit limiting bodies 2100a, and at least two unit limiting bodies 2100a are fixedly assembled on the supporting component 1000, wherein the unit limiting bodies 2100a are fixedly set at a preset position of the supporting component 1000, mainly manifested in that the unit limiting bodies 2100a cannot move along the axial direction of the supporting component 1000, and the connecting component 2200 is located between two of the unit limiting bodies 2100a, so that when the connecting component 2200 is connected to a unit area of ​​the bracket, the connecting component 2300 can stably limit the corresponding unit area of ​​the bracket between the corresponding two unit limiting bodies 2100a by connecting with the two unit limiting bodies 2100a.

[0046] The unit limiting bodies 2100a can be arranged in pairs at different positions of the support component 1000. For example, after two unit limiting bodies 2100a are configured as a pair, corresponding hole structures or groove structures can be opened on the unit limiting bodies 2100a to allow the connecting component 2300 to pass through, so as to connect the bracket with the connecting component 2200. For another example, after multiple unit limiting bodies 2100a are configured as multiple pairs, the multiple pairs of unit limiting bodies 2100a are distributed along the circumference of the support component 1000, that is, when the bracket is mounted on the support component 1000, the multiple pairs of unit limiting bodies 2100a are also equivalent to being distributed along the circumference of the bracket. At this time, the two unit limiting bodies 2100a of each pair are A connecting component 2200 can be set in each unit limiter 2100a, so that when the connecting component 2200 is connected to a unit area of ​​the bracket, the connecting component 2300 can not only stably connect the bracket with the connecting component 2200 by connecting with the two unit limiters 2100a, thereby stably limiting the corresponding unit area of ​​the bracket between the two unit limiters 2100a, but also can limit multiple unit areas circumferentially surrounding the bracket on the support component 1000 along the circumference of the bracket. For example, after multiple unit areas are circumferentially arranged at the proximal position of the bracket, the proximal end of the bracket can be concentrated and limited on the support component 1000 along the circumference.

[0047] The limiting component 2100, the connecting component 2200 and the connecting component 2300 can be constructed as structures suitable for mutual cooperation. For example, in one embodiment, the unit limiting body 2100a can be a limiting collar, which has an inner ring, and the limiting collar is sleeved on the supporting component 1000, and the limiting collar is fixedly connected to the supporting component 1000, for example, by bonding or binding. At the same time, the connecting component 2200 can also have a connecting through hole, which matches the inner ring of the limiting collar, and can pass through the connecting component 2300 together to connect the limiting component 2100 and the connecting component 2200.

[0048] See also Figure 1 As shown, in one embodiment, the connecting component 2200 includes a first connecting thread 2200a, one end of the first connecting thread 2200a is connected to the supporting component 1000, and the other end of the first connecting thread 2200a is provided with an end connecting body 2200b, and the connecting through hole is opened on the end connecting body 2200b. Figure 2As shown, the connecting component 2200 includes a second connecting thread 2200c, and both ends of the second connecting thread 2200c are connected to the supporting component 1000, so that the second connecting thread 2200c is surrounded to form a connecting through hole. Therefore, the connecting component 2200 can be constructed in a variety of different forms to form a connecting through hole for the inner ring of the ring body for matching the limiting ring. Those skilled in the art can select a suitable structure according to needs, and there is no limitation on this. Among them, the connecting component 2200 can be selected to use a polymer material with soft and bendable characteristics.

[0049] In one embodiment, the connecting component 2300 is a threading wire, which is used to flexibly thread through the inner ring of the limiting ring and the connecting through-hole of the connecting component 2200, thereby connecting the connecting component 2200 and at least two limiting rings. Therefore, the threading wire can simultaneously penetrate the inner ring of the limiting ring and the connecting through-hole of the connecting component 2200 to form a restriction on the stent. For example, when the connecting component 2200 adopts the first connecting wire 2200a, one end of the end connector 2200b provided on the first connecting wire 2200a passes through the connecting member 3000 of the stent, and then the threading wire is simultaneously penetrated into the inner ring of the limiting ring and the connecting through-hole of the connecting component 2200. When the connecting component 2200 adopts the second connecting wire 2200c, as Figure 2 As shown, after the second connecting thread 2200c passes through the connecting member 3000 of the stent, the threading thread is simultaneously passed through the inner ring of the limiting collar and the connecting through hole of the connecting component 2200. After a part of the stent is unfolded from the contracted state to the expanded state, the operator can pull the threading thread to gradually detach from the inner ring of the limiting collar and the connecting through hole of the connecting component 2200, release the restriction on the remaining stent area, release the unit area of ​​the stent, and complete the implantation of the stent.

[0050] The present application also provides a stent, which has an expanded state and a contracted state, and has at least one unit area. The stent is configured to be mounted on a support component 1000 of a rear release structure, and at least one unit area of ​​the stent is configured to be restricted on the support component 1000 by a restriction unit 2000 of the rear release structure, and the unit area of ​​the stent is restricted to a contracted state. In one embodiment, the proximal end of the stent has at least one unit area; or, the proximal end of the stent is provided with a plurality of unit areas, and the plurality of unit areas are arranged around the circumference of the stent. In one embodiment, the unit area of ​​the stent is provided with a connecting member 3000, and the connecting member 3000 is used to indirectly connect the unit area of ​​the stent to the restriction unit 2000. Since the specific structure, functional principle and technical effect of the stent and the rear release structure are described in detail in the previous text, they will not be repeated here. Any technical content related to the stent and the rear release structure refers to the previous record.

[0051] The present application also provides a stent system, the stent system includes a rear release structure; or the stent system includes a stent.

[0052] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above 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.

[0053] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A rear release structure, characterized in that: The rear release structure comprises: A supporting component, the supporting component is used for fitting the bracket; A limiting unit is provided on the supporting component, and is used to limit a partial area of ​​the bracket on the supporting component.

2. The rear release structure according to claim 1, characterized in that: The limiting unit comprises: a limiting component, wherein the limiting component is arranged on the supporting component; A connecting component, the connecting component is arranged on the supporting component, and the connecting component is used to connect with a partial area of ​​the bracket; A connecting component is used to connect the connecting component with the limiting component, thereby indirectly limiting a partial area of ​​the bracket on the supporting component.

3. The rear release structure according to claim 2, characterized in that: The limiting component includes at least two unit limiting bodies, at least two of the unit limiting bodies are fixedly assembled on the supporting component, and the connecting component is located between two of the unit limiting bodies.

4. The rear release structure according to claim 3, characterized in that: The unit limiting body is a limiting collar, the limiting collar is sleeved on the supporting component, and the limiting collar is fixedly connected to the supporting component; and / or, The connecting component has a connecting through hole.

5. The rear release structure according to claim 4, characterized in that: The connecting component comprises a first connecting thread, one end of which is connected to the supporting component, and the other end of which is provided with an end connecting body, and the connecting through hole is provided on the end connecting body; or The connecting component includes a second connecting thread, both ends of which are connected to the supporting component, so that the connecting through hole is formed by the second connecting thread surrounding.

6. The rear release structure according to claim 4, characterized in that: The connecting component is a threading wire, which is used to movably pass through the inner ring of the limiting collar and the connecting through hole of the connecting component, thereby connecting the connecting component and at least two of the limiting collars.

7. A bracket, characterized in that: The stent has an expanded state and a contracted state, the stent has at least one unit area, the stent is configured to be mounted on the support component of the rear release structure as described in any one of claims 1 to 6, and at least one of the unit areas of the stent is configured to be restricted on the support component by a restriction unit of the rear release structure as described in any one of claims 1 to 8, and the unit area of ​​the stent is restricted to a contracted state.

8. The bracket according to claim 7, characterized in that: The proximal end of the stent has at least one unit region; or, A plurality of the unit regions are disposed at the proximal end of the stent, and the plurality of the unit regions are arranged around the circumference of the stent.

9. The bracket according to claim 7, characterized in that: The unit region of the bracket is provided with a connecting member, and the connecting member is used to indirectly connect the unit region of the bracket with the limiting unit.

10. A support system, characterized in that: The support system comprises: The rear release structure according to any one of claims 1 to 6; or A bracket as claimed in any one of claims 7 to 9.

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