Interventional stent conversion assembly, interventional hemostatic stent and assembly method

Abstract

The embodiment of the application provides an interventional stent conversion assembly, an interventional hemostatic stent and an assembling method, and belongs to the technical field of medical devices. The interventional stent conversion assembly comprises an inner lining and an elastic member sleeved on the inner lining. The inner lining comprises a main body portion for supporting the elastic member and a pulling portion. The main body portion is a cylindrical structure formed by spirally winding a strip-shaped member. The main body portion has opposite first and second ends. The main body portion has a cavity extending in the axial direction. One end of the pulling portion is connected to the strip-shaped member forming the first end of the main body portion, and the other end extends out of the second end of the main body portion through the cavity of the main body portion. The elastic member is a sleeve structure and can be elastically deformed in the radial direction. When the elastic member is sleeved on the main body portion, the elastic member is expanded in the radial direction and attached to the main body portion. The interventional stent conversion assembly can quickly convert a common interventional stent into an interventional hemostatic stent, thereby completing rapid response treatment of sudden ischemic diseases.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more specifically, to an interventional stent conversion assembly, an interventional hemostatic stent, and an assembly method thereof. Background Technology

[0002] Based on their indications, interventional devices can be divided into devices for ischemic vascular diseases and devices for hemorrhagic vascular diseases. Ischemic vascular diseases are mainly caused by insufficient blood supply to organs or sites due to non-occlusive or narrowed blood vessels. Hemorrhagic vascular diseases are mainly caused by aneurysms resulting from long-term pressure on some blood vessels or by local rupture of blood vessels due to other reasons.

[0003] For ischemic vascular diseases, conventional interventional stents can be placed at the target location within the blood vessel to treat the ischemic condition. For hemorrhagic vascular diseases, endovascular stents covered with membrane grafts can be placed at the target location within the blood vessel to treat the hemorrhagic condition. However, in actual clinical practice, if an ischemic disease develops into a hemorrhagic disease or other unforeseen circumstances during treatment, it is necessary to replace the conventional interventional stent with an endovascular stent covered with membrane grafts. However, in actual clinical practice, there may be insufficient preparation of endovascular stents covered with membrane grafts, which could affect the normal progress of the procedure. Summary of the Invention

[0004] This application provides an interventional stent conversion component, an interventional hemostatic stent, and an assembly method, which enables ordinary interventional stents to be quickly converted into interventional hemostatic stents, enabling rapid response treatment for sudden ischemic diseases and providing doctors with more solutions to deal with emergencies in clinical surgical treatment.

[0005] In a first aspect, embodiments of this application provide an interventional stent conversion assembly, which is used to assemble an interventional stent to form an interventional hemostatic stent. The interventional stent conversion assembly includes an inner liner and an elastic member sleeved on the inner liner. The inner liner includes a main body portion and a traction portion for supporting the elastic member. The main body portion is a cylindrical structure formed by spirally winding a strip. Along the axial direction of the main body portion, the main body portion has a first end and a second end opposite to each other, and the main body portion has a cavity extending along the axial direction. The traction portion is a longitudinal member including two ends. One end of the traction portion is connected to the strip forming the first end of the main body portion, and the other end extends through the cavity of the main body portion and out of the second end of the main body portion. The elastic member is a sleeve-like structure and can elastically deform in the radial direction. When the elastic member is sleeved on the main body portion, the elastic member is stretched in the radial direction and adheres to the main body portion.

[0006] In this design, the interventional stent conversion assembly includes an inner liner and an elastic element. The elastic element is a sleeve-like structure, fitted onto the main body of the inner liner. The inner liner provides support for the elastic element, allowing it to expand radially, facilitating its subsequent assembly onto the interventional stent. The elastic element, through its own repositioning action, adheres to the interventional stent, forming an interventional hemostatic stent. By adopting a cylindrical structure formed by coiling strips in the main body of the inner liner, a traction section is connected to the strip at the first end of the main body. The other end of the traction section extends through a cavity in the main body and out the second end. Pulling the traction section allows the inner liner and elastic element to separate easily, facilitating operation by medical personnel. This allows the elastic element to be conveniently and quickly fitted onto the interventional stent to form an interventional hemostatic stent. The loading process is convenient and quick, with low operational difficulty for medical personnel. Especially in actual clinical treatment where there may be insufficient preparation of interventional covered stents, this design enables rapid response treatment for sudden ischemic diseases, addressing unexpected situations during clinical surgery and providing doctors with more solutions.

[0007] In some embodiments, the pulling portion and the strip forming the main body are integrally formed.

[0008] In the above technical solution, the traction part and the strip-shaped part forming the main body are integrally molded. The integrally molded inner liner has higher structural stability and can realize the overall processing and manufacturing of the inner liner, avoiding the detailed processing and splicing of the traction part and the main body, saving production time and manufacturing costs.

[0009] In some embodiments, the axial length of the main body is greater than the axial length of the elastic element.

[0010] In the above technical solution, the axial length of the main body is greater than the axial length of the elastic element. On the one hand, this ensures that the elastic element has radial support from the main body in the axial direction, reducing the risk of local contraction of the elastic element due to lack of support from the main body, which could lead to difficulties in assembling the interventional stent conversion assembly with the interventional stent. On the other hand, during the assembly of the interventional hemostatic stent, medical personnel can act on the main body without contacting the elastic element, reducing the probability of contamination of the elastic element.

[0011] In some embodiments, the outer surface of the elastic element is provided with a hydrophilic coating; and / or, the outer surface of the elastic element is provided with a drug coating.

[0012] In the above technical solution, by providing a hydrophilic coating on the outer surface of the elastic element, the hydrophilic coating enables the elastic element to have a hydrophilic effect. After the elastic element comes into contact with the blood vessel wall, the friction between the elastic element and the blood vessel wall can be reduced, making the elastic element less likely to damage the blood vessel and effectively reducing the probability of thrombosis. And / or, according to actual needs, a drug coating can be provided on the outer surface of the elastic element. The drug coating can be loaded with drugs, which can exert a drug therapeutic effect on the target location of the blood vessel.

[0013] In some embodiments, the elastic element is a polyurethane tube.

[0014] In the above technical solution, by using a polyurethane tube as the elastic element, the polyurethane tube, with its sealing properties and high elasticity, enables the hemostatic function of the interventional stent after being mounted on it. Furthermore, due to its high elasticity, the polyurethane tube can expand and work together with the interventional stent, meeting the expansion and deformation requirements of the stent.

[0015] In some embodiments, the cross-sectional shape of the main body is polygonal, elliptical, or circular.

[0016] In the above technical solution, the cross-sectional shape of the main body is polygonal, elliptical, or circular, which provides a wider range of shape selection and greater flexibility. The cross-sectional shape of the main body can be selected according to the actual situation.

[0017] In some embodiments, along the axial direction of the body portion, the body portion includes a plurality of coils, and adjacent coils are connected by an easy-tear connection.

[0018] In the above technical solution, the connection between two adjacent spiral coils is easily tearable. On the one hand, when the main body is not detached from the elastic element, the main body has relatively higher axial stiffness and a smaller range of lateral swing in its natural state, thus providing better radial support for the elastic element and facilitating the assembly of the interventional stent conversion component onto the interventional stent. When it is necessary to remove the inner liner, the easily tearable connection between the two adjacent spiral coils allows medical staff to separate them with slight force, facilitating the detachment of the inner liner from the elastic element and making the operation more effortless.

[0019] Secondly, embodiments of this application provide a method for assembling an interventional hemostatic stent. The assembly method includes the following steps: providing an interventional stent and an interventional stent conversion assembly of any of the aforementioned embodiments; fitting the interventional stent conversion assembly onto an interventional stent; pulling the traction part to pull the strip-shaped member forming the main body from the first end to the second end, the strip-shaped member gradually passing through the cavity and exiting from the second end of the main body until the main body becomes a strip-shaped member; thereby, the elastic member loses the radial support force of the liner and adheres to the interventional stent to form an interventional hemostatic stent.

[0020] In the above technical solution, medical staff pull the traction unit, pulling the strip-shaped component forming the main body from the first end to the second end. The strip-shaped component gradually passes through the cavity and exits from the second end of the main body, allowing the liner and elastic component to gradually detach. After losing the radial support of the liner, the elastic component automatically adheres to the interventional stent, transforming the ordinary interventional stent into one with the functions of a covered stent. The loading process of the interventional hemostatic stent is simple and convenient, greatly reducing the operational difficulty for medical staff. Medical staff can quickly convert ordinary interventional stents into interventional hemostatic stents, enabling rapid response treatment for sudden ischemic diseases, addressing unexpected situations during clinical surgical treatment, and providing doctors with more solutions.

[0021] In some embodiments, the second end of the main body is kept relatively fixed to the interventional stent before the traction portion is pulled.

[0022] In the above technical solution, the second end of the main body is kept relatively fixed to the interventional stent. In this way, during the process of pulling the traction part, the main body will not move relative to the interventional stent in the axial direction, which facilitates the separation of the main body from the elastic element.

[0023] Thirdly, embodiments of this application provide an interventional hemostatic stent, which includes an interventional stent and an interventional stent conversion component of any of the foregoing embodiments, the interventional stent conversion component being sleeved on the interventional stent.

[0024] In the above technical solution, the interventional stent conversion assembly is fitted onto the interventional stent. The inner liner and elastic element in the interventional stent conversion assembly are separated, and the elastic element is fitted onto the interventional stent to form an interventional hemostatic stent.

[0025] Fourthly, embodiments of this application provide an interventional hemostatic stent, which includes an interventional stent and an elastic element in the interventional stent conversion assembly of any of the foregoing embodiments, the elastic element being attached to the interventional stent.

[0026] In the above technical solution, the elastic element, after being attached to the interventional stent, forms an interventional hemostatic stent. The elastic element has a sleeve-like structure and acts as the membrane structure of the interventional hemostatic stent, making the structure of the interventional hemostatic stent simple. The elastic element can expand and work with the interventional stent to allow blood to flow within the interventional hemostatic stent without impacting the blood vessel wall during this process. This greatly avoids the possibility of blood vessel rupture and massive bleeding, and can meet the hemostatic function requirements of the interventional hemostatic stent. Furthermore, the elastic element of the interventional hemostatic stent is easy to disassemble, enabling bidirectional switching between the interventional hemostatic stent and other interventional stents, giving medical staff more options and providing doctors with more solutions.

[0027] In some embodiments, when the elastic element is in its natural state, the inner diameter of the elastic element is 0.1 mm to 1 mm smaller than the outer diameter of the interventional stent.

[0028] In the above technical solution, the inner diameter of the elastic element is 0.1mm-1mm smaller than the outer diameter of the interventional stent, so that the elastic element can cover and adhere tightly to the outer peripheral surface of the interventional stent. During the delivery of the interventional hemostatic stent by the delivery system, the elastic element is not easy to detach from the interventional stent, and the interventional hemostatic stent has higher stability.

[0029] In some embodiments, the two ends of the interventional stent extend beyond the two ends of the elastic element in the axial direction.

[0030] In the above technical solution, the interventional stent can provide effective support for the elastic element in the axial direction, avoiding the normal use of the interventional hemostatic stent due to the suspension and shrinkage of one end of the elastic element.

[0031] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of the interventional stent conversion assembly provided in some embodiments of this application;

[0034] Figure 2 A front view of an interventional stent conversion assembly provided in some embodiments of this application;

[0035] Figure 3 This is a schematic diagram of the structure of the inner liner in an interventional stent conversion assembly provided in some embodiments of this application;

[0036] Figure 4 for Figure 3 Front view of the inner lining component;

[0037] Figure 5 for Figure 3 Side view of the inner liner;

[0038] Figure 6 This is a schematic diagram of the structure of an interventional hemostatic stent provided in some embodiments of this application.

[0039] Icons: 100-Interventional stent conversion assembly; 10-Inner liner; 11-Main body; 111-First end; 112-Second end; 113-Cavity; 114-Rotating coil; 115-Breakpoint; 12-Tethering part; 20-Elastic element; 200-Interventional hemostatic stent; 201-Interventional stent. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] In the description of the embodiments of this application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on this application. In addition, the terms "first," "second," "third," etc. are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0044] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up" and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] Based on their indications, interventional devices can be divided into devices for ischemic vascular diseases and devices for hemorrhagic vascular diseases. For ischemic vascular diseases, conventional interventional stents are placed at the site of the infarction within the blood vessel, dilating the narrowed area and treating the ischemic condition. For hemorrhagic vascular diseases, endovascular stents covered with membranes are placed at the target location within the blood vessel. The membrane on the endovascular stent seals any ruptures in the vessel wall, thus treating the ischemic condition. Conventional interventional stents and endovascular stents covered with membranes are two different types of stents, and the two types cannot be switched. However, in actual clinical treatment, unexpected situations may arise, such as ischemic disease developing into hemorrhagic disease or other unforeseen circumstances during treatment. In such cases, the endovascular stent may be unprepared, affecting the normal progress of the procedure.

[0046] Therefore, this application provides an interventional stent conversion assembly, please refer to... Figures 1 to 6 An interventional stent conversion assembly 100 is used to assemble an interventional stent 201 to form an interventional hemostatic stent 200. The interventional stent conversion assembly 100 includes an inner liner 10 and an elastic member 20 sleeved on the inner liner 10. The inner liner 10 includes a main body portion 11 for supporting the elastic member 20 and a traction portion 12. The main body portion 11 is a cylindrical structure formed by spirally winding a strip. Along the axial direction of the main body portion 11, the main body portion 11 has a first end 111 and a second end 12. 12. The main body 11 has a cavity 113 extending along the axial direction; the pulling part 12 is a longitudinal member including two ends, one end of the pulling part 12 is connected to the strip-shaped member forming the first end 111 of the main body 11, and the other end extends through the cavity 113 of the main body 11 and out of the second end 112 of the main body 11; the elastic member 20 is a sleeve-shaped structure and can be elastically deformed in the radial direction. When the elastic member 20 is sleeved on the main body 11, the elastic member 20 is stretched in the radial direction and adheres to the main body 11.

[0047] In this solution, the interventional stent conversion assembly 100 includes an inner liner 10 and an elastic element 20. The elastic element 20 has a sleeve-like structure and is sleeved on the main body 11 of the inner liner 10. The inner liner 10 provides support for the elastic element 20, allowing the elastic element 20 to be expanded radially, which facilitates the subsequent assembly of the elastic element 20 onto the interventional stent 201. The elastic element 20 can adhere to the interventional stent 201 under its own repositioning action and form an interventional hemostatic stent 200. By adopting a cylindrical structure formed by coiling strips for the main body 11 of the inner liner 10, the traction part 12 is connected to the strip at the first end 111 of the main body 11, and the other end of the traction part 12 extends through the cavity 113 of the main body 11 and out of the second end 112 of the main body 11. Pulling the traction part 12 can cleverly separate the inner liner 10 from the elastic member 20, which is also convenient for medical staff to operate. The elastic member 20 can be easily and quickly fitted onto the interventional stent 201 to form the interventional hemostatic stent 200. The loading process is convenient and quick, and the operation difficulty for medical staff is low.

[0048] In clinical surgery, the interventional stent conversion component 100 can be used as a consumable. After the medical staff puts the interventional stent conversion component 100 on the interventional stent 201, the medical staff only needs to pull the traction part 12 to allow the inner liner 10 to gradually separate from the elastic element 20. After the elastic element 20 loses the radial support force of the inner liner 10, it automatically adheres to the interventional stent 201. Because the elastic element 20 is a sleeve-shaped structure, after the elastic element 20 adheres to the interventional stent 201, the interventional stent 201 after loading has a membrane structure. The elastic element 20 can expand and work with the interventional stent 201, which can meet the hemostatic function requirements of the interventional hemostatic stent 200. This solution cleverly breaks down the traditional interventional covered stent into functional components. With the interventional stent conversion component 100, medical staff can convert a regular interventional stent 201 into an interventional hemostatic stent 200 in actual clinical practice. This is especially useful in cases where there may be insufficient interventional covered stents available in actual clinical treatment. It enables rapid response treatment for sudden ischemic diseases, addresses unexpected situations in clinical surgical treatment, and provides doctors with more solutions.

[0049] The inner liner 10 can be made of PDFE or nylon. PDFE, or polytetrafluoroethylene, allows the inner liner 10 to deform radially. The main body 11 and the tensioning part 12 of the inner liner 10 can be integrally formed or connected through subsequent processing. The elastic element 20 can be made of a polymer material, such as polyurethane. The elastic element 20 has high radial deformation capacity, which can meet the expansion requirements of the interventional stent 201. The interventional stent conversion assembly 100 has a wide range of applications, including cardiovascular, neurovascular, peripheral vascular, reproductive system, and tracheal systems.

[0050] It should be noted that when assembling the interventional hemostatic stent 200, the inner diameter of the liner 10 is larger than the outer diameter of the interventional stent 201. Medical personnel can directly fit the interventional stent conversion assembly 100 onto the interventional stent 201. After the interventional stent conversion assembly 100 is fitted onto the interventional stent 201, the medical personnel hold the interventional stent 201 near the second end 112 with one hand, keeping the interventional stent conversion assembly 100 and the interventional stent 201 relatively fixed axially. Then, with the other hand, they pull the traction part 12, pulling the strip-shaped member forming the main body 11 from the first end 111 towards the second end 112. The strip-shaped member gradually passes through the cavity 113 and exits from the second end 112 of the main body 11 until the main body 11 becomes a strip-shaped member. After the elastic member 20 loses the radial support force of the liner 10, the elastic member 20 adheres to the interventional stent 201 to form the interventional hemostatic stent 200.

[0051] Because the elastic element 20 is very small, with an outer diameter on the order of millimeters, it is difficult for medical staff to directly mount the elastic element 20 onto the interventional stent 201 in actual clinical practice. During the actual manufacturing process of the interventional stent conversion assembly 100, tools (such as molds) can be used to expand the elastic element 20 before mounting it onto the inner liner 10, thus assembling the interventional stent conversion assembly 100. In clinical surgery, through the ingenious design of the inner liner 10, medical staff can quickly mount the elastic element 20 onto the interventional stent 201, and then coat the interventional stent 201 with a membrane to obtain the interventional hemostatic stent 200.

[0052] In some embodiments, please refer to Figure 3 , Figure 4 and Figure 5 The tensioning part 12 is integrally formed with the strip-shaped member forming the main body part 11. By integrally forming the tensioning part 12 with the strip-shaped member forming the main body part 11, the structure of the integrally formed inner liner 10 is more stable, and the inner liner 10 can be manufactured as a whole, avoiding the detailed processing and splicing of the tensioning part 12 and the main body part 11, thus saving production time and manufacturing costs.

[0053] In some embodiments, please refer to Figure 1 and Figure 2The axial length of the main body 11 is greater than the axial length of the elastic element 20. This greater axial length ensures that the elastic element 20 receives radial support from the main body 11 throughout its axial direction, reducing the risk of localized contraction of the elastic element 20 due to the lack of support from the main body 11, which could lead to difficulties in assembling the interventional stent conversion assembly with the interventional stent 201. Furthermore, during the assembly of the interventional hemostatic stent 200, medical personnel can apply pressure to the main body 11 without contacting the elastic element 20, reducing the probability of contamination of the elastic element 20.

[0054] The axial length of the main body 11 is greater than the axial length of the elastic member 20. It can be that both ends of the main body 11 extend beyond both ends of the elastic member 20, or one end of the main body 11 extends beyond one end of the elastic member 20 and the other end is flush with the end of the elastic member 20.

[0055] In this embodiment, please refer to Figure 1 and Figure 2 Both ends of the main body 11 extend beyond the two ends of the elastic member 20 in the axial direction.

[0056] In some embodiments, the outer surface of the elastic element 20 is provided with a hydrophilic coating; and / or, the outer surface of the elastic element 20 is provided with a drug coating. By providing a hydrophilic coating on the outer surface of the elastic element 20, the hydrophilic coating enables the elastic element 20 to have a hydrophilic effect. After the elastic element 20 comes into contact with the blood vessel wall, the friction between the elastic element 20 and the blood vessel wall can be reduced, making it less likely for the elastic element 20 to damage the blood vessel and effectively reducing the probability of thrombosis. And / or, depending on actual needs, a drug coating can be provided on the outer surface of the elastic element 20. The drug coating can be loaded with a drug, which can exert a therapeutic effect on the target location of the blood vessel.

[0057] In some embodiments, the elastic element 20 is a polyurethane tube. By using a polyurethane tube as the elastic element 20, the polyurethane tube has sealing properties and high elasticity. After the elastic element 20 is mounted on the interventional stent 201, the hemostatic function of the interventional hemostatic stent 200 can be realized. Furthermore, due to its high elasticity, the polyurethane tube can expand and work together with the interventional stent 201 to meet the expansion and deformation requirements of the interventional stent 201.

[0058] The polyurethane tube has a wall thickness of 0.001mm to 0.200mm and can expand to 5 to 10 times its own diameter, which can fully meet the needs of the interventional stent 201. The restored size of the polyurethane tube will be slightly smaller than the size of the interventional stent 201 before it is opened. For example, the inner diameter of the polyurethane tube is 0.1mm to 1mm smaller than the outer diameter of the interventional stent 201 in its contracted state.

[0059] In some embodiments, the cross-sectional shape of the main body 11 is polygonal, elliptical, or circular. The cross-sectional shape of the main body 11 can be polygonal, elliptical, or circular, providing a wider range of shape choices and greater flexibility. The cross-sectional shape of the main body 11 can be selected according to actual circumstances.

[0060] For example, please refer to Figure 5 The main body 11 has a circular cross-sectional shape, which provides 360° annular support to the elastic element 20 in the circumferential direction, resulting in a larger support area and better support for the elastic element 20. Furthermore, the outer surface of the circular cross-section main body 11 is all arc-shaped, making it less likely to scratch the elastic element 20.

[0061] In some embodiments, please combine Figure 4 and Figure 5 Along the axial direction of the main body 11, the main body 11 includes multiple spiral rings 114, with an easy-tear connection between adjacent spiral rings 114. This easy-tear connection between adjacent spiral rings 114 serves two purposes: firstly, when the main body 11 is not detached from the elastic element 20, it results in relatively higher axial stiffness and less lateral swaying of the main body 11 in its natural state, thus providing better radial support to the elastic element 20 and facilitating the assembly of the interventional stent conversion component onto the interventional stent 201. Secondly, when it is necessary to remove the inner liner 10, the easy-tear connection between adjacent spiral rings 114 allows medical personnel to easily separate them with slight force, facilitating the detachment of the inner liner 10 from the elastic element 20 and making the operation more effortless.

[0062] Along the circumference of the spiral ring 114, there are multiple breakpoints 115 connecting adjacent spiral rings 114. When the spiral ring 114 is subjected to tension, the breakpoints 115 will lose their connection. The way the breakpoints 115 are connected is similar to the principle of the easy-tear line on the tissue paper packaging bag in the prior art, so the easy-tear line will not be described in detail here.

[0063] This application provides an assembly method for an interventional hemostatic stent, which includes the following steps: providing an interventional stent 201 and an interventional stent conversion assembly 100 of any of the aforementioned embodiments; fitting the interventional stent conversion assembly 100 onto the interventional stent 201; pulling the traction part 12 to pull the strip-shaped member forming the main body 11 from the first end 111 to the second end 112, the strip-shaped member gradually passing through the cavity 113 and exiting from the second end 112 of the main body 11 until the main body 11 becomes a strip-shaped member; thereby, the elastic member 20 loses the radial support force of the inner liner 10 and adheres to the interventional stent 201 to form the interventional hemostatic stent 200.

[0064] Medical staff pull the traction part 12, pulling the strip-shaped component forming the main body 11 from the first end 111 to the second end 112. The strip-shaped component gradually passes through the cavity 113 and exits from the second end 112 of the main body 11, allowing the inner liner 10 to gradually detach from the elastic component 20. After losing the radial support force of the inner liner 10, the elastic component 20 automatically adheres to the interventional stent 201, transforming the ordinary interventional stent 201 into an interventional covered stent with the functions of an interventional hemostatic stent. The loading process of the interventional hemostatic stent 200 is simple and convenient, greatly reducing the operational difficulty for medical staff. Medical staff can quickly convert the ordinary interventional stent 201 into an interventional hemostatic stent 200, enabling rapid response treatment for sudden ischemic diseases, addressing emergencies during clinical surgical treatment, and providing doctors with more solutions.

[0065] In some embodiments, before pulling the traction portion 12, the second end 112 of the main body portion 11 is kept relatively fixed to the interventional stent 201. Keeping the second end 112 of the main body portion 11 relatively fixed to the interventional stent 201 ensures that the main body portion 11 will not move relative to the interventional stent 201 in the axial direction during the pulling of the traction portion 12, facilitating the separation of the main body portion 11 from the elastic member 20.

[0066] In this way, the second end 112 of the main body 11 is kept relatively fixed to the interventional stent 201. In fact, medical staff can hold the interventional stent 201 near the second end 112 with one hand to keep the interventional stent conversion component and the interventional stent 201 relatively fixed in the axial direction, and then pull the traction part 12 with the other hand. One medical staff can complete the assembly of the interventional hemostatic stent 200.

[0067] This application provides an interventional hemostatic stent 200, which includes an interventional stent 201 and an interventional stent conversion assembly 100 as described in any of the preceding embodiments. The interventional stent conversion assembly 100 is sleeved on the interventional stent 201. By separating the inner liner 10 and the elastic member 20 in the interventional stent conversion assembly 100, and allowing the elastic member 20 to be sleeved on the interventional stent 201, the interventional hemostatic stent 200 can be assembled.

[0068] This application provides an interventional hemostatic stent; please refer to... Figure 6The interventional hemostatic stent 200 includes an interventional stent 201 and an elastic element 20 from the interventional stent conversion assembly 100 of any of the aforementioned embodiments. The elastic element 20 is attached to the interventional stent 201. After the elastic element 20 is attached to the interventional stent 201, the interventional hemostatic stent 200 is formed. The elastic element 20 has a sleeve-like structure and acts as the membrane structure of the interventional hemostatic stent 200, making the structure of the interventional hemostatic stent 200 simple. The elastic element 20 can expand and work in sync with the interventional stent 201, so that blood can flow within the interventional hemostatic stent 200 without impacting the blood vessel wall during this process. This greatly avoids the possibility of blood vessel rupture leading to massive bleeding and meets the hemostatic function requirements of the interventional hemostatic stent 200. Furthermore, the elastic element 20 of the interventional hemostatic stent 200 is easily detachable, enabling bidirectional switching between the interventional hemostatic stent 200 and the interventional stent 201, providing medical staff with more options and doctors with more solutions.

[0069] The interventional stent 201 can be a standard interventional stent 201, such as a shape-memory metal, like a nickel-titanium alloy stent with self-expansion function, or a balloon-expandable stainless steel stent. When the interventional stent 201 is a nickel-titanium alloy stent with self-expansion function, the elastic element 20 is prepared in advance at the head end of the nickel-titanium stent delivery system. Then, the nickel-titanium stent is released to a retrievable, suitable size. During the release process of the interventional stent 201, the elastic element 20 is loaded and installed onto the interventional stent 201. After loading is completed, the interventional stent 201 is retrieved into the delivery system, and the interventional stent 201 becomes a membrane structure with functional features. Interventional surgery can then be performed according to the normal operating procedure to achieve the aforementioned related effects.

[0070] In some embodiments, when the elastic element 20 is in its natural state, the inner diameter of the elastic element 20 is 0.1mm-1mm smaller than the outer diameter of the interventional stent 201. Making the inner diameter of the elastic element 20 0.1mm-1mm smaller than the outer diameter of the interventional stent 201 allows the elastic element 20 to tightly cover and adhere to the outer peripheral surface of the interventional stent 201. During the delivery of the interventional hemostatic stent 200 by the delivery system, the elastic element 20 is less likely to detach from the interventional stent 201, resulting in higher stability of the interventional hemostatic stent 200.

[0071] In some embodiments, please refer to Figure 6 The two ends of the interventional stent 201 extend beyond the two ends of the elastic element 20 in the axial direction. The interventional stent 201 can provide effective support for the elastic element 20 in the axial direction, avoiding the normal use of the interventional hemostatic stent 200 due to the suspension and shrinkage of one end of the elastic element 20.

[0072] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0073] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An interventional stent conversion assembly for assembling on an interventional stent to form an interventional hemostatic stent, characterized in that, The inner liner and the elastic member sleeved on the inner liner; The inner liner comprises a main body part and a pulling part for supporting the elastic member, the main body part is a cylindrical structure formed by spirally winding a strip; Along the axial direction of the main body part, the main body part has opposite first and second ends, and has a cavity extending in the axial direction; the pulling part is a longitudinal member comprising two ends, one end of the pulling part is connected with the strip forming the first end of the main body part, and the other end extends out of the second end of the main body part through the cavity of the main body part; The elastic member is a sleeve structure and can be elastically deformed in the radial direction, when the elastic member is sleeved on the main body part, the elastic member is expanded in the radial direction and attached to the main body part.

2. The interventional stent conversion assembly of claim 1, wherein, The pulling part is integrally formed with the strip forming the main body part.

3. The interventional stent conversion assembly of claim 1, wherein, The length of the main body part in the axial direction is greater than the length of the elastic member in the axial direction.

4. The interventional stent conversion assembly of claim 1, wherein, The outer surface of the elastic member is provided with a hydrophilic coating; and / or, the outer surface of the elastic member is provided with a drug coating.

5. The interventional stent conversion assembly of claim 1, wherein, The elastic member is a polyurethane tube.

6. The interventional stent conversion assembly of claim 1, wherein, The cross-sectional shape of the main body part is polygonal, elliptical or circular.

7. The interventional stent conversion assembly of any of claims 1-6, wherein, Along the axial direction of the main body part, the main body part comprises a plurality of spiral turns, and the adjacent two spiral turns are connected by a tearable connection.

8. A method of assembling an interventional hemostatic stent, characterized by, The steps include: Providing an interventional stent and an interventional stent conversion assembly according to any one of claims 1-7; Sleeving the interventional stent conversion assembly on an interventional stent; Pulling the pulling part to pull the strip forming the main body part from the first end to the second end direction, the strip gradually passes through the cavity and comes out of the second end of the main body part, until the main body part becomes a strip; Thus, the elastic member loses the radial support of the inner liner and is attached to the interventional stent to form an interventional hemostatic stent.

9. The method of assembling an endovascular hemostatic stent according to claim 8, wherein, Before pulling the pulling part, the second end of the main body part is kept relatively fixed with the interventional stent.

10. An interventional hemostatic stent, characterized in that, The interventional stent and the interventional stent conversion assembly according to any one of claims 1-7, the interventional stent conversion assembly is sleeved on the interventional stent.

11. The interventional hemostatic stent of claim 10, wherein, When the elastic member is in a natural state, the inner diameter of the elastic member is 0.1-1mm smaller than the outer diameter of the interventional stent.

12. The interventional hemostatic stent of claim 10, wherein, The axial ends of the interventional stent respectively exceed the axial ends of the elastic member.

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