A removable positioning support having a support structure

Abstract

The application discloses a retrievable positioning support with support structures and relates to the technical field of medical devices.The scheme comprises the following steps: a wire support is made of a memory metal material and is used for being deployed in a human body blood vessel; a plurality of support structures are arranged on the circumferential side wall of the wire support and are symmetrically distributed and arranged at equal intervals in the axial direction of the wire support or are asymmetrically distributed and arranged at unequal intervals; the plurality of support structures comprise at least two different types; when the wire support is deployed, the support structures abut against the inner wall of the blood vessel to prevent the axial displacement of the wire support in the blood vessel, and the support structures support the inner wall of the blood vessel so that a gap exists between the support structures and the inner wall of the blood vessel.The retrievable positioning support can avoid displacement, reduce the problem of blood vessel peeling, reduce the difficulty of removal and the risk of blood vessel tearing, and has positioning stability, support and removal safety, and the patient does not need to take rejection drugs for a long time.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a removable positioning stent with a support structure. Background Technology

[0002] Various blockages or narrowings can occur in human blood vessels due to various reasons, such as sudden thrombosis. Therefore, interventional stent placement is currently a routine treatment method. However, long-term use has revealed that while interventional stent treatment is effective in emergency situations, several problems remain after placement. For example, stent displacement can occur under conditions of high blood flow velocity and high blood pressure, especially in elderly patients whose blood vessels have reduced elasticity. Additionally, due to the body's natural response, stents may spread to the surface, further narrowing the stenotic area. Furthermore, patients need to take long-term anti-rejection medications. To avoid these problems, removing the stent from the blood vessel is a new trend.

[0003] Currently, a type of stent with high-rigidity and high-strength barbs has been developed. These barbs pierce the blood vessel wall to fix the stent and prevent displacement. However, if the stent needs to be removed, the barbs can tear the blood vessel wall if it shifts, creating a contradiction between the two issues mentioned above. Therefore, ensuring that the stent is not easily displaced after insertion while also being easily and safely removed when needed becomes a problem that needs to be solved. Solving this problem is of great significance to the lives and health of patients. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, the present invention provides a removable positioning bracket with a support structure.

[0005] To achieve the above objectives, the present invention provides a removable positioning bracket with a support structure, comprising: A wire stent, made of shape memory metal, is used to deploy within human blood vessels; Multiple support structures are disposed on the circumferential sidewall of the wire support. The multiple support structures are symmetrically distributed and equally spaced in the axial direction of the wire support, or are asymmetrically distributed and not equally spaced. The plurality of support structures include at least two different types of support structures. When the wire stent is deployed, the support structure abuts against the inner wall of the blood vessel to prevent the wire stent from axially displacing in the blood vessel, and supports the inner wall of the blood vessel so that there is a gap between the support structure and the inner wall of the blood vessel.

[0006] Preferably, the at least two different types of support structures include a first type of support member, the first type of support member including a first support arm and a second support arm, one end of the first support arm and one end of the second support arm being connected at an angle and fixedly connected to the wire bracket. A first bend is provided at the free end of the first support arm, which is extended and bent to form a first bend. A second bend is provided at the free end of the second support arm, which is extended and bent to form a second bend. Both the first bend and the second bend have a bend point. When the wire stent is deployed, the bend point is used to press against and embed into the inner wall of the blood vessel.

[0007] Preferably, the at least two different types of support structures include a second type of support member, the second type of support member including a first metal needle with a tip, the bottom of the first metal needle being fixedly connected to the metal wire support, and when the metal wire support is deployed, the free end of the first metal needle is set as a tip, the tip of the first metal needle being used to pierce the inner wall of the blood vessel; The angle between the axial direction of the first metal needle and the axial direction of the metal wire support is in the range of 80°-90°.

[0008] Preferably, the at least two different types of support structures include a third type of support member, the third type of support member including a second metal needle and a third support arm, one end of the second metal needle being connected at an angle to one end of the third support arm and being fixedly connected to the metal wire bracket; The free end of the second metal needle is set as a tip, and a third bend is provided at the free end of the third support arm, which is formed by extending and bending the third support arm. The third bend has a bending point. When the metal wire support is deployed, the bending point is used to press against and embed into the inner wall of the blood vessel, and the tip of the second metal needle is used to pierce the inner wall of the blood vessel.

[0009] Preferably, a coating layer is provided on the outside of the first metal needle, the coating layer being made of a biodegradable material and completely enclosing the first metal needle; The coating layer is cone-shaped, with the cone tip facing the inner wall of the blood vessel. When the metal wire stent is deployed, the coating layer and the first metal needle form a composite structure and jointly penetrate the inner wall of the blood vessel.

[0010] Preferably, a coating layer is provided on the outside of the second metal needle, the coating layer being made of a biodegradable material and completely enclosing the second metal needle; The coating layer is cone-shaped, with the cone tip facing the inner wall of the blood vessel. When the metal wire stent is deployed, the coating layer and the second metal needle form a composite structure and jointly penetrate the inner wall of the blood vessel.

[0011] Preferably, the angle between the axial direction of the second metal needle and the axial direction of the metal wire support is in the range of 80°-90°.

[0012] Preferably, the first bend and the second bend are configured as conical or arc-shaped.

[0013] Preferably, the third bend is configured as a cone or an arc.

[0014] Preferably, the first support arm and the second support arm are arranged symmetrically or asymmetrically.

[0015] Based on this, the beneficial effects of the present invention are as follows: 1. This invention provides multiple support structures, including at least two different types, along the circumferential sidewall of a wire stent. A first and a second metal needle are inserted into the vascular wall, effectively limiting the displacement of the wire stent within the blood vessel. Simultaneously, a first, second, and third support arm provide support to the blood vessel, effectively addressing vascular stenosis and blockage. Furthermore, the point contact between the support structure and the vascular wall replaces the surface contact between the wire stent sidewall and the vascular wall, effectively resolving the issues of high stent resistance and difficulty in removal during skin climbing and stent wall tearing during displacement. This invention also boasts excellent positioning and safety performance.

[0016] 2. The present invention provides a coating layer on the outside of the first and second metal needles. The coating layer is made of a biodegradable material. When the coating layer can form a composite structure with the first or second metal needle and simultaneously penetrate the inner wall of the blood vessel, the connection between the first and second metal needles and the inner wall of the blood vessel loosens when the coating layer degrades. This significantly reduces the resistance caused by the connection between the support structure and the inner wall of the blood vessel, and improves the convenience of stent removal. Attached Figure Description

[0017] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A schematic diagram illustrating the structure of a removable positioning bracket according to a first embodiment of the present invention; Figure 2 This illustration shows one embodiment of the present invention. Figure 1 Enlarged view of point A in the middle; Figure 3 This illustration shows one embodiment of the present invention. Figure 1 Enlarged view at point B Figure 4 This illustration shows one embodiment of the present invention. Figure 1 Enlarged view of point C in the middle; Figure 5 This schematic diagram illustrates the structure of a removable positioning bracket according to a second embodiment of the present invention. Figure 6 This illustration shows one embodiment of the present invention. Figure 5 Enlarged view at point E in the middle; Figure 7 This illustration shows one embodiment of the present invention. Figure 5 Enlarged view at point F; Explanation of reference numerals in the attached figures: 10-Metal wire support; 20-Support structure, 201-First type support member, 2011-First support arm, 20111-First bending part, 2012-Second support arm, 20121-Second bending part, 202-Second type support member, 2021-First metal needle, 203-Third type support member, 2031-Second metal needle, 2032-Third support arm, 20321-Third bending part; 30-Covering layer. Detailed Implementation

[0018] 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, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms "a," "the," and "the" as used in the embodiments of this application are also intended to include the plural forms unless the context clearly indicates otherwise.

[0020] It should be understood that although the terms first, second, third, etc., may be used to describe related structures in the embodiments of this application, these related structures should not be limited to these terms. These terms are only used to distinguish related structures from each other.

[0021] Depending on the context, the word "if" as used here can be interpreted as "when" or "when". Similarly, depending on the context, the phrase "if determined" can be interpreted as "when determined" or "when (the condition or event of the statement) is detected".

[0022] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should also be understood that when it is mentioned that an element is formed "upper" or "lower" of another element, it can not only be formed directly "upper" or "lower" of the other element, but also indirectly "upper" or "lower" of the other element through an intermediate element.

[0023] Figure 1 This schematic diagram illustrates the structure of the removable positioning bracket according to a first embodiment of the present invention, as shown below. Figure 1 As shown, a removable positioning bracket with a support structure according to the present invention includes: The wire stent 10, made of shape memory metal material, is used to be deployed in human blood vessels. Multiple support structures 20 are disposed on the circumferential sidewall of the wire bracket 10. The multiple support structures 20 are symmetrically distributed and equally spaced in the axial direction of the wire bracket 10, or are asymmetrically distributed and not equally spaced. The multiple support structures 20 include at least two different types of support structures 20. When the wire stent 10 is deployed, the support structure 20 abuts against the inner wall of the blood vessel to prevent the wire stent 10 from axially displacing in the blood vessel, and supports the inner wall of the blood vessel so that there is a gap between the support structure 20 and the inner wall of the blood vessel.

[0024] Specifically, the wire stent 10 is a tubular structure formed by multiple woven or spiraled wires. The wires are specially made of shape memory alloy that meets national medical requirements. When the wire stent 10 is delivered to the appropriate position in the human blood vessel through the delivery catheter, it is released. The wire stent 10 unfolds in the blood vessel according to the pre-prepared shape, so that the multiple support structures 20 on it abut against the inner wall of the blood vessel. The ends or tips of the support structures 20 press against the inner wall of the blood vessel, or penetrate the surface or superficial layer of the blood vessel wall, thus opening the blood vessel. The resistance between the multiple pressure points and the inner wall of the blood vessel prevents the wire stent 10 from shifting, thus stabilizing the removable positioning stent in the predetermined position and greatly improving the medical effect of the removable positioning stent.

[0025] Meanwhile, the support of multiple support structures 20 creates gaps between the wire stent 10 and the inner wall of the blood vessel. This means that the wire stent 10 and the inner wall of the blood vessel are in contact at multiple points (with multiple support structures 20 pressing against each other). When the body's biological response causes intimal hyperplasia, the intimal hyperplasia covers the support structures 20 and the surface of the wire stent 10, making the wire stent 10 in point contact with the inner wall of the blood vessel. This makes the resistance of the intimal hyperplasia to the removable positioning stent extremely small compared to the traditional method of contact between the wire stent 10 and the inner wall of the blood vessel. This makes the removable positioning stent very easy to remove. At the same time, the multi-point contact prevents the intimal hyperplasia from tearing and breaking when the removable positioning stent is moved, thus preventing new blockages in the blood vessel and greatly improving the safety of the removable positioning stent.

[0026] Furthermore, the multiple support structures 20 are provided with at least two different types. One type can penetrate the inner wall of the blood vessel to increase the resistance of the wire stent 10 and enhance the positioning effect. The other type can press against the inner wall of the blood vessel, fully support the inner wall of the blood vessel, and reduce the damage to the inner wall of the blood vessel caused by the insertion, thereby further improving the safety of the removable stent.

[0027] Furthermore, Figure 2 This illustration shows one embodiment of the present invention. Figure 1 Enlarged view of point A in the middle, as shown Figure 2 As shown, at least two different types of support structures 20 of the present invention include a first type of support member 201. The first type of support member 201 includes a first support arm 2011 and a second support arm 2012. One end of the first support arm 2011 and one end of the second support arm 2012 are connected at an angle and are fixedly connected to the wire bracket 10. A first bent portion 20111 is provided at the free end of the first support arm 2011, which is formed by extending and bending the first support arm 2011. A second bent portion 20121 is provided at the free end of the second support arm 2012, which is formed by extending and bending the second support arm 2012. Both the first bent portion 20111 and the second bent portion 20121 have a bending point. When the wire stent 10 is unfolded, the bending point is used to press against and embed into the inner wall of the blood vessel.

[0028] Specifically, the first support arm 2011 and the second support arm 2012 are connected at an angle to form a V-shaped structure. The free end of the support arm extends toward the inner wall of the blood vessel. When the support arm bends, the first bending part 20111 and the second bending part 20121 form an inverted V-shaped structure with a bending point. When the bending point presses against the inner wall of the blood vessel, the pressure point causes the inner wall of the blood vessel to be compressed and form a depression. The depression and the bending point interlock, thereby forming resistance to the displacement of the bending point. At the same time, the support arm will not puncture the inner wall of the blood vessel, so that the first type of support member 201 has good safety.

[0029] At the same time, when the wire stent 10 is removed by pulling with greater force, the inclined portions of the first bending portion 20111 and the second bending portion 20121 on both sides of the bending point can guide the bending point to be withdrawn in the depression of the blood vessel wall, which is conducive to the removal of the wire stent 10.

[0030] In addition, the first bending portion 20111 and the second bending portion 20121 can be set as conical or arc-shaped. When it is conical, the bending point is located at the tip of the cone. When it presses against the blood vessel wall, due to the inclined setting of the first support arm 2011 and the second support arm 2012, the bending point can avoid pressing the inner wall of the blood vessel too deeply, so that the bending point will not or will not puncture the inner wall of the blood vessel, thus ensuring the safety of the removable positioning stent.

[0031] When the first bend 20111 and the second bend 20121 are arc-shaped, the bend point is located at the highest point of the arc. When it presses against the blood vessel wall, the arc-shaped surface will not puncture the inner wall of the blood vessel, thus fully realizing the safety of the removable positioning stent.

[0032] Furthermore, the first support arm 2011 and the second support arm 2012 are arranged symmetrically or asymmetrically. When the first support arm 2011 and the second support arm 2012 are arranged symmetrically, the angle between their axis lines and the axis line of the wire stent 10 is the same. At this time, there is no need to consider the insertion direction of the wire stent 10. Any direction can ensure that the two support arms have the same pressure on the inner wall of the blood vessel when the blood flows. When the two support arms are set asymmetrically, the angles between the centerlines of the first support arm 2011 and the second support arm 2012 and the centerline of the wire stent 10 are inconsistent. This will cause a difference in the pressure exerted by the two support arms on the inner wall of the blood vessel. That is, the smaller the angle between a certain support arm and the centerline of the wire stent 10, the greater the axial resistance formed by that support arm on the inner wall of the blood vessel, and the stronger the blocking effect on the axial displacement of the wire stent 10. Therefore, in the operation of placing the positioning stent into the blood vessel, it is necessary to combine the actual flow direction of blood flow and select a reasonable orientation of the wire stent 10 so that the support arm with a smaller angle and stronger axial resistance corresponds to the direction of blood flow impact, thereby further enhancing the positioning stability of the stent, achieving better positioning performance, and making the removal of the stent more convenient when it is removed in the opposite direction.

[0033] Furthermore, Figure 3 This illustration shows one embodiment of the present invention. Figure 1 Enlarged view of point B, as shown Figure 3As shown, at least two different types of support structures 20 of the present invention include a second type of support member 202. The second type of support member 202 includes a first metal needle 2021 with a tip. The bottom of the first metal needle 2021 is fixedly connected to the metal wire support 10. When the metal wire support 10 is unfolded, the free end of the first metal needle 2021 is a tip. The tip of the first metal needle 2021 is used to pierce the inner wall of the blood vessel. The angle between the axial direction of the first metal needle 2021 and the axial direction of the metal wire support 10 is in the range of 80°-90°.

[0034] With this configuration, the first metal needle 2021 is inserted into the inner wall of the blood vessel, thereby increasing the resistance between the blood vessel and the metal wire stent 10, effectively preventing the metal wire stent 10 from displacing in the blood vessel, and thus improving the positioning effect of the removable positioning stent.

[0035] Meanwhile, by slightly tilting the first metal needle 2021, when the wire support 10 moves along its extension direction, the first metal needle 2021 can increase the resistance to its movement. When the wire support 10 moves in the opposite direction to the extension direction of the first metal needle 2021, it is beneficial for the tip of the first metal needle 2021 to withdraw from the inner wall of the blood vessel, so that when the wire support 10 is removed in this direction, it provides assistance for its removal and reduces the pulling and breaking of the blood vessel wall.

[0036] In addition, the length and rigidity of the first metal needle 2021 can be specifically designed during manufacturing, thereby controlling the first metal needle 2021 to only penetrate the superficial layer of the blood vessel wall when it pierces it. This allows it to prevent the metal wire stent 10 from shifting while not penetrating too deeply, ensuring better safety for the removable positioning stent.

[0037] When the metal wire stent 10 is provided with a first type of support 201 and a second type of support 202 on its circumferential sidewall, the first type of support 201 provides sufficient support for the blood vessel wall and reduces the risk of puncture to the blood vessel wall, while the second type of support 202 provides a positioning effect for the removable positioning stent, so that the removable positioning stent has good support effect, positioning effect, easy removal effect and safety.

[0038] Furthermore, Figure 4 This illustration shows one embodiment of the present invention. Figure 1 Enlarged view of point C, as shown Figure 4 As shown, the at least two different types of support structures 20 of the present invention also include a third type of support member 203. The third type of support member 203 includes a second metal needle 2031 and a third support arm 2032. One end of the second metal needle 2031 is connected at an angle to the third support arm 2032 and is fixedly connected to the metal wire bracket 10. The free end of the second metal needle 2031 is a tip. At the free end of the third support arm 2032, there is a third bending part 20321 formed by extending and bending the third support arm 2032. The third bending part 20321 has a bending point. When the metal wire support 10 is unfolded, the bending point is used to press against and embed into the inner wall of the blood vessel. The tip of the second metal needle 2031 is used to pierce the inner wall of the blood vessel.

[0039] With this configuration, when the wire stent 10 unfolds so that the second metal needle 2031 and the third support arm 2032 come into contact with the inner wall of the blood vessel, the second metal needle 2031 pierces the inner wall of the blood vessel, while the third support arm 2032 presses against the inner wall of the blood vessel and bends downward. When the elasticity of the third support arm 2032 is balanced with the pressure of the inner wall of the blood vessel, the third support arm 2032 stops moving downward, thus fixing the distance between the circumferential sidewall of the wire stent 10 and the inner wall of the blood vessel. This prevents the second metal needle 2031 from piercing further. The third support arm 2032 limits the piercing depth of the second metal needle 2031, thereby avoiding damage to the inner wall of the blood vessel from excessive piercing and improving the safety of the positioning stent.

[0040] The third bending part 20321 can also be set as a cone or arc shape to ensure the safety of the removable bracket; The angle between the axial direction of the second metal needle 2031 and the axial direction of the metal wire support 10 is also set to 80°-90°, which can achieve the same limiting function of the metal wire support 10 moving in the same extension direction as the second metal needle 2031, and the convenience of moving in the opposite direction.

[0041] When the first type of support 201 is combined with the third type of support 203, or the second type of support 202 is combined with the third type of support 203, or all three are combined, the positioning effect is enhanced by the first metal needle 2021 and the second metal needle 2031 piercing the blood vessel wall. The blood vessel wall is supported by the first support arm 2011, the second support arm 2012 and the third support arm 2032, and the piercing depth of the first metal needle 2021 and the second metal needle 2031 is limited, thereby enhancing the safety of the removable positioning stent. This makes the removable positioning stent have good support effect, positioning effect, easy removal effect and safety.

[0042] Furthermore, Figure 5 This schematic diagram illustrates the structure of a removable positioning bracket according to a second embodiment of the present invention. Figure 6 This illustration shows one embodiment of the present invention. Figure 5 Enlarged view at point E in the middle. Figure 7 This illustration shows one embodiment of the present invention. Figure 5 Enlarged view at point F, as shown Figure 5-7As shown, based on the structure of the first embodiment described above, the present invention provides a covering layer 30 on the outer side of the first metal needle 2021 and the second metal needle 2031.

[0043] The covering layer 30 is made of medical biodegradable material that meets national standards and is permitted for use in the human body, and completely covers the first metal needle 2021 and the second metal needle 2031. When the covering layer 30 is solid, it is conical with its tip facing the inner wall of the blood vessel. When the wire stent 10 is deployed, the first metal needle 2021 and the covering layer 30, and the second metal needle 2031 and the covering layer 30 together pierce the blood vessel wall. The composite structure of the two can improve the rigidity of the first metal needle 2021 and the second metal needle 2031, making them less prone to bending, thereby improving the positioning effect of the wire stent 10.

[0044] Meanwhile, due to the biodegradability of the coating layer 30, after the coating layer 30 degrades over a period of time, the tightness of the connection between the first metal needle 2021 and the second metal needle 2031 as they penetrate the inner wall of the blood vessel decreases, and its rigidity is reduced, making it easier to remove the metal wire stent 10.

[0045] In summary, the present invention reduces the damage to the blood vessel wall when the wire stent 10 is removed by simultaneously setting at least two different types of support structures 20 on the circumferential sidewall of the wire stent 10 through multiple point contacts, and the combination of different types of support structures 20 makes the removable stent have good support, positioning and safety.

[0046] The above description is merely a preferred embodiment of this application. Those skilled in the art should understand that the scope of disclosure in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A removable positioning bracket with a support structure, characterized in that, include: A wire stent, made of shape memory metal, is used to deploy within human blood vessels; Multiple support structures are disposed on the circumferential sidewall of the wire support. The multiple support structures are symmetrically distributed and equally spaced in the axial direction of the wire support, or are asymmetrically distributed and not equally spaced. The plurality of support structures include at least two different types of support structures. When the wire stent is deployed, the support structure abuts against the inner wall of the blood vessel to prevent the wire stent from axially displacing in the blood vessel, and supports the inner wall of the blood vessel so that there is a gap between the support structure and the inner wall of the blood vessel. The at least two different types of support structures include a first type of support member, which includes a first support arm and a second support arm. One end of the first support arm and one end of the second support arm are connected at an angle and are fixedly connected to the wire bracket. A first bend portion formed by extending and bending the first support arm is provided at the free end of the first support arm, and a second bend portion formed by extending and bending the second support arm is provided at the free end of the second support arm. Both the first bend portion and the second bend portion have a bending point. When the wire stent is deployed, the bending point is used to press against and embed into the inner wall of the blood vessel. The at least two different types of support structures include a third type of support member, which includes a second metal needle and a third support arm. One end of the second metal needle is connected at an angle to one end of the third support arm and is fixedly connected to the metal wire bracket. The free end of the second metal needle is set as a tip, and a third bend is provided at the free end of the third support arm, which is formed by extending and bending the third support arm. The third bend has a bending point. When the metal wire support is deployed, the bending point is used to press against and embed into the inner wall of the blood vessel, and the tip of the second metal needle is used to pierce the inner wall of the blood vessel.

2. The removable positioning bracket with a support structure according to claim 1, characterized in that, The at least two different types of support structures include a second type of support member, the second type of support member including a first metal needle with a tip, the bottom of the first metal needle being fixedly connected to the metal wire support, and when the metal wire support is deployed, the free end of the first metal needle is set as a tip, the tip of the first metal needle being used to pierce the inner wall of the blood vessel. The angle between the axial direction of the first metal needle and the axial direction of the metal wire support is in the range of 80°-90°.

3. A removable positioning bracket with a support structure according to claim 2, characterized in that, A coating layer is provided on the outside of the first metal needle, the coating layer being made of a biodegradable material and completely enclosing the first metal needle; The coating layer is cone-shaped, with the cone tip facing the inner wall of the blood vessel. When the metal wire stent is deployed, the coating layer and the first metal needle form a composite structure and jointly penetrate the inner wall of the blood vessel.

4. A removable positioning bracket with a support structure according to claim 1, characterized in that, A coating layer is provided on the outside of the second metal needle, the coating layer being made of a biodegradable material and completely enclosing the second metal needle; The coating layer is cone-shaped, with the cone tip facing the inner wall of the blood vessel. When the metal wire stent is deployed, the coating layer and the second metal needle form a composite structure and jointly penetrate the inner wall of the blood vessel.

5. A removable positioning bracket with a support structure according to claim 1, characterized in that, The angle between the axial direction of the second metal needle and the axial direction of the metal wire support is in the range of 80°-90°.

6. A removable positioning bracket with a support structure according to claim 1, characterized in that, The first and second bends are configured as either conical or arc-shaped.

7. A removable positioning bracket with a support structure according to claim 1, characterized in that, The third bend is configured as a cone or an arc.

8. A removable positioning bracket with a support structure according to claim 1, characterized in that, The first support arm and the second support arm are arranged symmetrically or asymmetrically.

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