Thrombectomy stent

Abstract

The utility model relates to a thrombectomy stent, which comprises a guide spring, a stent body, a stent body and a stent body, and is characterized in that the guide spring spirally extends from a near end to a far end; the stent comprises a plurality of grid units and connecting ribs connected among the grid units, the end, close to the far end, of the stent is connected with the end, close to the near end, of the guide spring, the stent is made of shape memory alloy, and the stent is configured to expand after being released in a blood vessel and used for fixing thrombus; the pushing guide wire is connected with one end, close to the near end, of the stent and is used for pushing the stent to the far end and withdrawing the stent to the near end; a ball capable of rotating in any direction is arranged at the position, close to the far end, of the support or the pushing guide wire. According to the thrombectomy stent, the balls are arranged on the thrombectomy stent, so that the friction force of the stent in the pushing and withdrawing processes can be reduced, the operation flexibility is improved, the resistance between the stent and a blood vessel wall can be reduced, and the probability of blood vessel injury is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of thrombus removal brackets, and in particular to a thrombus removal bracket. Background Art

[0002] A stent retriever is a medical device used for intravascular clot removal and is widely used in thrombosis-related conditions such as acute ischemic stroke (cerebral infarction) and acute lower limb ischemia. In the treatment of acute ischemic stroke, a stent retriever can effectively clear cerebral vessels blocked by clots, restore blood flow, and reduce irreversible damage to brain tissue.

[0003] In the prior art, the Chinese utility model patent with publication number CN216317846U disclosed a thrombectomy stent on April 19, 2022. The stent is composed of a mesh structure. After the stent reaches the site of the thrombus, the stent is released to expand in the blood vessel and wrap the thrombus, so that the thrombus and the stent are firmly combined together, and then the stent and the thrombus are withdrawn together through a guide wire.

[0004] However, during the above-mentioned thrombectomy process, the inventors found that due to the large radial force of the closed-loop thrombectomy stent, the resistance to pushing and retracting was relatively large during the delivery in the microcatheter; and, during the process of retracting the thrombus, the closed-loop thrombectomy stent adhered to the blood vessel wall, which could easily damage the vascular endothelium, causing bleeding or intimal hyperplasia. Utility Model Content

[0005] The utility model provides a thrombus removal bracket to solve the technical problem that the existing thrombus removal bracket has a large resistance when moving toward the distal end or the proximal end.

[0006] The utility model discloses a thrombus removal stent, comprising a guide spring, a stent, and a push guide wire. The guide spring is spirally extended from the proximal end toward the distal end. The stent comprises a plurality of grid units and connecting ribs connected between the plurality of grid units. An end of the stent near the distal end is connected to an end of the guide spring near the proximal end. The stent is made of a shape memory alloy and is configured to expand after being released in a blood vessel to fix a thrombus. The push guide wire is connected to an end of the stent near the proximal end and is used to push the stent toward the distal end and retract it toward the proximal end.

[0007] Wherein, a ball bearing that can rotate in any direction is provided on the bracket or at a position close to the distal end of the guide wire.

[0008] Furthermore, the balls are made of a developing material.

[0009] Furthermore, the balls are arranged at both ends of the bracket.

[0010] Furthermore, both ends of the bracket have slots, and the balls are rotatably connected in the slots.

[0011] Furthermore, the end of the guide spring close to the distal end is hemispherical.

[0012] Furthermore, the guide spring is made of developing material.

[0013] Furthermore, the ball bearings are arranged on the body of the bracket.

[0014] Furthermore, the balls are arranged on the connecting ribs.

[0015] Furthermore, a groove for accommodating the ball is provided on the connecting rib.

[0016] Furthermore, the balls are arranged on the grid units.

[0017] The thrombus removal bracket provided by the present invention can achieve the following technical effects:

[0018] The utility model can reduce the friction of the stent during the pushing and retracting process by arranging balls on the thrombus removal stent, improve the operational flexibility, and reduce the resistance between the stent and the blood vessel wall, thereby reducing the probability of blood vessel damage.

[0019] The above general description and the following description are merely exemplary and explanatory and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are considered similar elements, and wherein:

[0021] Figure 1 This is a schematic structural diagram of the thrombus removal bracket in an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of the connection structure between the guide spring and the bracket in an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the connection structure between the ball and the slot in the embodiment of the present utility model;

[0024] Figure 4 This is a schematic diagram of the connection structure between the push guide wire and the stent in an embodiment of the present utility model;

[0025] Figure 5 This is a schematic diagram of the connection structure between the ball and the slot in the embodiment of the present utility model;

[0026] Figure 6 This is a schematic diagram of a partially enlarged structure of the distal end of the guide spring in an embodiment of the present utility model;

[0027] Figure 7 It is an enlarged schematic diagram of the structure of the connecting rib in the embodiment of the present utility model.

[0028] Reference numerals:

[0029] 1. Guide spring; 2. Bracket; 21. Connecting rib; 22. Grid unit; 23. Slot hole; 24. Groove; 3. Push guide wire; 4. Ball. DETAILED DESCRIPTION

[0030] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0031] In the description and claims of the embodiments of the present disclosure, as well as in the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate to describe the embodiments of the present disclosure herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0032] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to having a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0033] Furthermore, the terms "disposed," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a removable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or an internal connection between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this disclosure based on the specific circumstances.

[0034] Unless otherwise specified, the term "plurality" means two or more and "plurality" means two or more.

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0036] In the present invention, the distal end refers to the end away from the operator during surgery, and the proximal end refers to the end close to the operator during surgery.

[0037] First embodiment

[0038] The thrombus removal stent mentioned in this embodiment is as follows Figures 1 to 5 As shown in FIG, the thrombus removal stent includes a guide spring 1, a stent 2 and a push guide wire 3. Figure 1 As shown in the figure, the guide spring 1 is spirally extended from the proximal end to the distal end; in the embodiment of the present utility model, the guide spring 1 is set to be spirally shaped and extends in a straight direction. The flexibility and operability of the spring can be increased by the spiral structure, so that the guide spring 1 can push and guide the stent 2 into the blood vessel more smoothly, which is conducive to operation in more tortuous blood vessels.

[0039] The stent 2 includes a plurality of grid units 22 and connecting ribs 21 connected between the plurality of grid units 22. The distal end of the stent 2 is connected to the proximal end of the guide spring 1. The stent 2 is a shape memory alloy, such as nickel-titanium alloy. The stent 2 is configured to expand after being released in the blood vessel to fix the thrombus. During the specific operation, the stent 2 penetrates into the thrombus when released, and then expands through the stent 2 to form a full-scale fixation of the thrombus. In an embodiment of the present invention, the grid unit 22 forms a curve in the axial direction, and then after expanding in the thrombus, the fixation strength of the thrombus can be improved.

[0040] The pushing guide wire 3 is connected to the proximal end of the stent 2 and is used for pushing and retracting the stent 2; in an embodiment of the present utility model, the pushing guide wire 3 is used to push and retract the stent 2 and the guide spring 1, so that the doctor can achieve precise pushing and retraction of the stent 2 through external control.

[0041] In the embodiment of the present invention, a ball 4 that can rotate in any direction is provided on the stent 2 or near the distal end of the guide wire 3. When setting it up, the friction characteristics of the stent 2 as a whole can be adjusted by selecting balls 4 of different diameters and numbers.

[0042] In an embodiment of the present invention, the guide spring 1 and the ball 4 can be made of developing materials such as platinum-tungsten alloy, platinum-iridium alloy, etc.; in addition, an anticoagulant coating such as heparin, silicone coating, fluoride coating, etc. can be coated on the thrombus removal stent, which can effectively reduce the formation of thrombus; through the combination of different material properties, it can be ensured that the thrombus removal stent has good smoothness, biocompatibility and mechanical strength when operating in the blood vessel.

[0043] In the above embodiment, by providing the ball 4 on the thrombus removal stent, the friction of the stent 2 during the pushing and retracting process can be reduced, the operational flexibility can be improved, and the resistance between the stent and the blood vessel wall can be reduced, thereby reducing the probability of blood vessel damage.

[0044] In the embodiment of the present invention, the ball 4 is made of a developing material. This developing material provides good contrast in image detection, facilitating real-time observation of the position information of the bracket 2. Specific materials may be the platinum-tungsten alloy, platinum-iridium alloy, and the like mentioned above.

[0045] Please refer to Figures 1 to 3 In one embodiment of the present invention, the balls 4 are arranged at both ends of the bracket 2. The specific implementation is as follows Figures 2 to 5 As shown in FIG, slots 23 are formed at both ends of the bracket 2 at the connection points with the proximal end of the guide spring 1 and the distal end of the push guide wire 3, and the ball 4 is rotatably connected to the slots 23. In the embodiment of the present invention, the slots 23 are configured in a manner similar to the grooves on the tip of a ballpoint pen, so that the ball 4 can rotate after being inserted without falling out. That is, the size of the opening of the slots 23 is slightly smaller than the diameter of the ball 4, and the ball 4 is then clamped therein through a clearance fit. This structural configuration can prevent the ball 4 from falling or getting stuck during the advancement and retraction process.

[0046] In addition, in the embodiment of the present invention, in order to reduce the friction of the guide spring 1 when entering the blood vessel or thrombus, as shown in FIG. Figure 6 As shown in the figure, the distal end of the guide spring 1 is hemispherical. This structural configuration maintains the spring's flexibility, reduces friction, and makes operation more precise and controllable. The guide spring 1 is also made of a developer material, the specific materials of which have been mentioned above and will not be repeated here.

[0047] Second embodiment

[0048] This embodiment also proposes a thrombus removal stent. The second embodiment is a further improvement based on the first embodiment. The specific solution is as follows:

[0049] like Figure 7 As shown in FIG, the ball 4 is arranged on the body of the bracket 2. The body of the bracket 2 here refers to the connecting rib 21 or the grid unit 22 of the bracket 2, as shown in FIG. Figure 5 As shown in FIG, in an embodiment of the present invention, grooves 24 for rotating and securing the balls 4 can be provided on the connecting ribs 21 or the grid units 22. The structure of the grooves 24 is the same as that of the ends of the stent 2 described above, and can be fabricated using micro-nano manufacturing processes, precision laser cutting, or electroplating techniques. In an embodiment of the present invention, the tiny balls 4 can be mounted on the connecting ribs 21 or the grid units 22 using existing processes, which can be assembled under microscope guidance in a sterile environment. However, this is not limited to existing technologies; future, more sophisticated processes that achieve the aforementioned function and form thrombectomy stents still fall within the scope of protection of the present invention.

[0050] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless expressly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A thrombus removal stent, characterized in that: include: A guide spring extending in a spiral direction from the proximal end to the distal end; A stent comprising a plurality of grid units and connecting ribs connected between the plurality of grid units, wherein one end of the stent near the distal end is connected to the one end of the guide spring near the proximal end, the stent being made of a shape memory alloy and configured to expand upon release in a blood vessel to fix a thrombus; A push guide wire is connected to the proximal end of the stent and is used to push the stent toward the distal end and retract it toward the proximal end; Wherein, a ball that can rotate in any direction is provided on the bracket or at a position close to the distal end of the pushing guide wire.

2. The thrombus removal stent according to claim 1, characterized in that: The rolling ball is made of a developing material.

3. The thrombus removal stent according to claim 1 or 2, characterized in that: The balls are arranged at both ends of the bracket.

4. The thrombus removal stent according to claim 3, characterized in that: Two ends of the bracket are provided with slots, and the balls are rotatably connected in the slots.

5. The thrombus removal stent according to claim 1 or 2, characterized in that: One end of the guide spring close to the distal end is hemispherical.

6. The thrombus removal stent according to claim 1, characterized in that: The guide spring is made of developing material.

7. The thrombus removal stent according to claim 1 or 2, characterized in that: The ball bearings are arranged on the main body of the bracket.

8. The thrombus removal stent according to claim 7, characterized in that: The balls are arranged on the connecting ribs.

9. The thrombus removal stent according to claim 8, characterized in that: The connecting rib is provided with a groove for accommodating the balls.

10. The thrombus removal stent according to claim 7, characterized in that: The balls are arranged on the grid units.

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