An intracranial thrombectomy protection device

Abstract

The utility model provides a kind of intracranial stent retrieval protection device, it is related to medical instrument technical field, including stent retrieval part, protection part and connecting part;The distal end of stent retrieval part is connected with connecting part;Connecting part distal end connects protection part, and the protection part is used to capture escaped embolus;Filter membrane is provided on the protection part, and the distal end of filter membrane is retracted together to middle part;Protection wire is peripherally arranged on the outside of protection part, filter membrane is arranged between protection wire and protection part, the proximal end of protection wire is connected to the connecting part, and the distal end of protection wire is gathered in the distal end of protection part;The utility model is combined by stent retrieval part and protection part, stent retrieval part and protection part are pressed and held together in microcatheter, when releasing, first release distal end protection part, then release stent retrieval part at embolus, let stent retrieval part bear stent retrieval function, protection part prevents embolus escape, for intracranial blood vessel and other small and tortuous blood vessel with inner diameter, the device has better performance.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to an intracranial thrombectomy protection device. Background Technology

[0002] The principle of stent thrombectomy is to guide a guide wire through the thrombus under the guidance of imaging technology and insert a microcatheter. The thrombectomy stent is then inserted along the microcatheter and withdrawn. The thrombectomy stent, made of shape memory alloy, will automatically release and open. Then the stent ribs combine with the thrombus, embedding the thrombus into the mesh structure of the stent. The thrombus and the stent are then removed from the body together, thus completing a thrombectomy procedure.

[0003] The stent's wires secure the thrombus to the metal structure surface through radial cutting and interlocking. Axial pulling motions then separate and displace the thrombus, allowing for its removal. During this process, broken thrombus fragments often travel distally with the bloodstream. Clinically, balloon occlusion proximal to the thrombus or deployment of a protective umbrella device distal to it are commonly used to prevent embolism escape. However, for thrombectomy procedures involving narrow intracranial vessels, the small diameter and tortuous nature of these vessels make it difficult for the protective umbrella device to reach the distal working area.

[0004] Therefore, current intracranial thrombectomy stents only have thrombectomy function and no protective function. There is a need to provide an intracranial thrombectomy stent that can prevent emboli from escaping. Utility Model Content

[0005] The purpose of this invention is to provide an intracranial thrombectomy protection device. By combining the thrombectomy part and the protection part, the thrombectomy part and the protection part are pressed together in the microcatheter, so as to solve the problem that the protective umbrella device is difficult to reach the remote working area due to the special characteristics of the small inner diameter and tortuousness of intracranial blood vessels.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An intracranial thrombectomy protection device includes a thrombectomy part, a protection part, and a connecting part;

[0008] The distal end of the thrombectomy section is connected to the connecting section;

[0009] The connecting part is connected to the protective part at its distal end, and the protective part is used to capture the escaped embolus;

[0010] The protective part is provided with a filter membrane, and the distal end of the filter membrane is contracted together towards the middle;

[0011] A protective wire is arranged circumferentially on the outer side of the protective part, and a filter membrane is disposed between the protective wire and the protective part. The proximal end of the protective wire is connected to the connecting part, and the distal end of the protective wire converges at the distal end of the protective part.

[0012] Preferably, both the thrombectomy section and the protective section are bracket structures, and the axial length and radial width of the thrombectomy section and the protective section can be the same or different.

[0013] Preferably, the filter membrane is provided with a plurality of micropores for blood to pass through, and the pore size of the filter membrane is 80-120 μm.

[0014] Preferably, the protective part is umbrella-shaped and is woven from nickel-titanium alloy wire.

[0015] Preferably, the connecting part is provided with a rotating component that allows the bolt part and the protective part to rotate relative to each other.

[0016] Preferably, the rotating component includes two tubes that are rotatably connected to each other, one tube being fixedly connected to the proximal portion of the connecting part, and the other tube being fixedly connected to the distal portion of the connecting part.

[0017] Preferably, both the thrombectomy part and the protective part are components made of nickel-titanium alloy.

[0018] Preferably, the filter membrane is a polyurethane membrane layer.

[0019] Preferably, the connecting part includes an outer connecting wire formed by intertwining several nickel-titanium wires.

[0020] Beneficial effects:

[0021] (1) By setting up a combination of thrombectomy part and protective part, before release, the thrombectomy part and protective part are pressed together in the microcatheter. When releasing, the distal protective part is released first, and then the thrombectomy part is released at the embolus. The thrombectomy part undertakes the thrombectomy function, and the protective part prevents the embolus from escaping. For intracranial blood vessels and other blood vessels with small inner diameter and tortuous shape, this device has better positioning performance.

[0022] (2) By setting the thrombectomy part as multiple interconnected sub-stents, and connecting the sub-stents with internal connecting wires, the present invention can achieve better bending stability, thrombus capture and distal escape prevention capability by setting multiple sub-stents compared with the integrated thrombectomy stent.

[0023] (3) By setting a polyurethane membrane layer, the present invention has good biocompatibility in blood vessels and has little impact on the intravascular environment. Pores are set on the polyurethane membrane layer to allow blood to pass through, which not only captures emboli but also reduces the impact on blood flow, thus playing a stable protective role.

[0024] (4) By setting up a protective wire, this utility model can support the protective part and further stabilize the filter membrane, thus avoiding the risk of the filter membrane falling off when the device is retracted, which could lead to the escape of the embolus. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. Wherein:

[0026] Figure 1 This is a schematic diagram of the structure of the bolt-taking part and the connecting part in one embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the overall structure in one embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the overall structure in another embodiment of the present invention.

[0029] Figure 4 for Figure 3 Enlarged structural diagram of section A.

[0030] In the diagram: 1. Plug take-up section; 11. Support bracket; 2. Protective section; 21. Recoverable wire; 3. Connecting section; 31. Inner connecting wire; 32. Outer connecting wire; 34. Rotating connector; 4. Filter membrane; 5. Protective wire. Detailed Implementation

[0031] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art are within the protection scope of this utility model.

[0032] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do 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, they should not be construed as limitations on this utility model.

[0033] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" and "second" may explicitly or implicitly include one or more features.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection or a connection that can communicate with each other; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements, an indirect connection, or an interaction between two elements.

[0036] In the description of this utility model, "distal end" refers to the end that is farther away from the doctor during surgery, and "proximal end" refers to the end that is closer to the doctor during surgery.

[0037] In the description of this utility model, "before use" refers to the state before the intracranial thrombectomy protection device is used, before it enters the human body, or before it comes into contact with bodily fluids such as blood and tissue fluid in the human body, while "during use" refers to the state after the intracranial thrombectomy protection device has entered the human body or come into contact with bodily fluids such as blood and tissue fluid in the human body.

[0038] In the description of this utility model, "converged state" refers to the state in which the "thrombus take-off part" is attached to each other within a local length range or the entire length range.

[0039] In the description of this utility model, "internal environment" refers to the environment below the epidermis of the skin where body fluids are present, such as the dermis and subcutaneous tissue, or the inside of blood vessels and organs.

[0040] The present invention will now be described in detail with reference to the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0041] This invention addresses the problem of thrombectomy procedures performed on narrow intracranial blood vessels, where the protective umbrella device struggles to reach the remote working area due to the small diameter and tortuous nature of intracranial vessels.

[0042] This utility model provides a protective device for intracranial thrombectomy, such as... Figure 1 and Figure 2 As shown, it includes the thrombectomy section 1;

[0043] A wire-like connecting part 3 is provided at the distal end of the thrombectomy part 1;

[0044] A protective part 2 is provided at the distal end of the connecting part 3, and the protective part 2 is used to capture the escaped tether;

[0045] A filter membrane 4 is provided on the outer side of the protective part 2, and the distal end of the filter membrane 4 is tapered together towards the middle;

[0046] A protective wire 5 is circumferentially arranged on the outer side of the protective part 2. The filter membrane 4 is disposed between the protective wire 5 and the protective part 2. The proximal end of the protective wire 5 is connected to the connecting part 3, and the distal end of the protective wire 5 converges at the distal end of the protective part 2. The protective wire 5 can prevent thrombus escape caused by the filter membrane 4 detaching during the retrieval process of this device.

[0047] The thrombectomy section 1 is made of nickel-titanium alloy through laser engraving or weaving, featuring a mesh structure with certain shape memory properties. It can be pressed onto the catheter and expands radially after release. The protective section 2 is also a mesh structure made of nickel-titanium alloy. The protective section 2 and the thrombectomy section 1 are integrally molded, making the entire protective device a unified whole and facilitating control of the entire device.

[0048] In another embodiment of this utility model, the protective part 2 and the bolt-taking part 1 can also be molded separately and fixed by welding connecting wires.

[0049] The connecting part 3 is a wire-like structure with one end integrally formed with the thrombus-retrieving part 1 and the other end integrally formed with the protective part 2, preferably made of nickel-titanium wire. The connecting part 3 connects the thrombus-retrieving part 1 and the protective part 2. After release, the protective part 2 is located at the distal end of the thrombus-retrieving part 1 and plays a role in capturing the thrombus that escapes from the thrombus-retrieving part 1.

[0050] Because intracranial blood vessels have small diameters and are tortuous, the filamentous structure of the connecting part can bend flexibly within the vessel, reducing damage to the vessel wall. Its flexibility allows the device to better conform to the vessel's course when passing through narrow or tortuous segments, ensuring that the thrombectomy unit 1 and the protective unit 2 reach the target position smoothly. This improves the device's positioning performance within intracranial blood vessels and provides strong support for the successful implementation of the thrombectomy procedure.

[0051] Furthermore, a filter membrane 4 is adhered to the protective part 2. The filter membrane 4 is made of a material with a certain degree of elasticity, preferably polyurethane. Polyurethane has a certain degree of biocompatibility and has minimal impact on the intravascular environment during use. When the protective part 2 bulges, the filter membrane 4 can remain tightly attached to the protective part 2 and bulge together, preventing the filter membrane 4 from slipping off during the bulging process and affecting the protective function. The filter membrane 4 is provided with pores to allow blood to pass through, but does not allow emboli to pass through.

[0052] This invention combines the thrombectomy part 1 and the protective part 2, which are pressed together in the microcatheter. When releasing, the distal protective part 2 is released first, and then the thrombectomy part 1 is released at the embolus, so that the thrombectomy part 1 can perform the thrombectomy function, while the protective part 2 prevents the embolus from escaping.

[0053] In a preferred embodiment of this invention, both the thrombectomy section 1 and the protective section 2 are stent structures. The axial length and radial width of the thrombectomy section 1 and the protective section 2 can be the same or different. After bulging, the stent structure can better conform to the blood vessel, increasing the stability of the device during operation and reducing the possibility of device displacement. The axial length and radial width of the thrombectomy section 1 and the protective section 2 can be set to multiple specifications, allowing for the selection of appropriate specifications based on the actual length of the blood vessel and the thrombus, thereby improving applicability. For intracranial vessels and other vessels with small inner diameters and tortuous structures, this device has better positioning performance.

[0054] In a preferred embodiment of this invention, the filter membrane 4 is disposed on the outer layer of the protective part 2. The filter membrane 4 is adhered to the outer layer of the protective part 2 by an adhesive method, which can provide a stable protective function against any escaped emboli.

[0055] The filter membrane 4 has multiple micropores for blood flow, and the diameter of the micropores on the filter membrane 4 is 80-120μm (e.g., 80μm, 85μm, 90μm, 95μm, 100μm, 105μm, 110μm, 115μm, 120μm).

[0056] In a preferred embodiment of this invention, the protective part 2 is umbrella-shaped and is woven from nickel-titanium alloy wire. The protective part 2 has shape memory function; it is pre-shaped externally into an umbrella shape with a larger proximal diameter and a smaller distal diameter, and expands into an umbrella shape after release, providing good protection for the embolus.

[0057] In a preferred embodiment of this invention, the protective part 2 is provided with a recovery thread 21, which is fixedly connected to the connecting part 3. The recovery thread 21 consists of several intertwined nickel-titanium wires, concentrated near the end of the protective part 2 to form a stable connection point. This point also appears as a concentrated shadow under the developing equipment, making it easier for the operator to determine the position of the protective part 2. The recovery thread 21 is welded to the connecting wire or integrally formed to ensure a stable connection, thereby preventing the protective part 2 from being difficult to recover due to breakage.

[0058] like Figure 3 As shown, in a preferred embodiment of this invention, the thrombectomy section 1 is provided with multiple interconnected sub-stents 11, which are connected by internal connecting wires 31. In one embodiment, the number of sub-stents 11 is set to four, and the multiple sub-stents 11 are symmetrically arranged about the middle. Compared with a one-piece thrombectomy stent, the use of multiple sub-stents 11 can achieve better bending stability, thrombus capture, and distal escape prevention capability.

[0059] In a preferred embodiment of this invention, both the thrombectomy part 1 and the protective part 2 are components made of nickel-titanium alloy. Nickel-titanium alloy has a certain degree of flexibility and shape memory function, which can meet certain requirements for permeability and has a relatively small impact on the intravascular environment.

[0060] In a preferred embodiment of this invention, the filter membrane 4 is a polyurethane membrane layer. Polyurethane membrane layers have good biocompatibility within blood vessels and have minimal impact on the intravascular environment. Pores are created in the polyurethane membrane layer to allow blood to pass through, thus capturing emboli while minimizing disruption to blood flow.

[0061] In a preferred embodiment of this invention, the connecting part 3 includes an outer connecting wire 32 formed by intertwining several nickel-titanium wires. One end of the outer connecting wire 32 is integrally formed with the latching part 1, and the other end is integrally formed with the protective part 2, ensuring the connection between the latching part 1 and the protective part 2 and facilitating subsequent recycling operations.

[0062] The following detailed description of an intracranial thrombectomy protection device of the present invention is provided through specific embodiments.

[0063] Example 1

[0064] This embodiment provides an intracranial thrombectomy protection device, such as... Figure 1 and Figure 2 As shown, it includes the thrombectomy section 1;

[0065] The connecting part 3 is integrally formed at the distal end of the thrombectomy part 1;

[0066] The protective part 2 is integrally formed at the distal end of the connecting part 3, and the protective part 2 is used to capture the escaped tether;

[0067] A filter membrane 4 is adhered to the protective part 2, and the distal end of the filter membrane 4 is tapered together towards the middle;

[0068] A protective wire 5 is arranged circumferentially on the outer side of the protective part 2, and a filter membrane 4 is disposed between the protective wire 5 and the protective part 2. The proximal end of the protective wire 5 is connected to the connecting part 3, and the distal end of the protective wire 5 is gathered at the distal end of the protective part 2.

[0069] Both the thrombectomy part 1 and the protective part 2 are made of nickel-titanium alloy by laser engraving or weaving, forming a mesh structure with certain shape memory function. They can be pressed onto the catheter and expand radially after release. The connecting part 3 has a filamentous structure, making the entire protective device an integrated unit and facilitating control of the entire device.

[0070] The filter membrane 4 is made of a material with a certain degree of elasticity, preferably polyurethane. Polyurethane has a certain degree of biocompatibility and has minimal impact on the intravascular environment during use. When the protective part 2 bulges, the filter membrane 4 can remain tightly attached to the protective part 2 and bulge together, preventing the filter membrane 4 from slipping off during the bulging process and affecting the protective function. The filter membrane 4 is provided with micropores to allow blood to pass through, but does not allow emboli to pass through.

[0071] By combining the thrombectomy section 1 and the protective section 2, both sections are held together within the microcatheter. During release, the distal protective section 2 is released first, followed by the release of the thrombectomy section 1 at the embolus. The thrombectomy section 1 then performs the thrombectomy function, while the protective section 2 prevents the embolus from escaping. The diameter of the micropore is 80-120 μm, for example, 80 μm or 120 μm.

[0072] Both the thrombectomy section 1 and the protective section 2 are stent structures. The axial length and radial width of the thrombectomy section 1 and the protective section 2 can be the same or different. After bulging, the stent structure can better conform to the blood vessel, increasing the stability of the device during operation and reducing the possibility of device displacement. The axial length and radial width of the thrombectomy section 1 and the protective section 2 can be set to multiple specifications, allowing for the selection of appropriate specifications based on the actual length of the blood vessel and the thrombus, thereby improving applicability. For intracranial vessels and other vessels with small inner diameters and tortuous structures, this device has better positioning performance.

[0073] In this embodiment, the connecting part 3 includes an outer connecting wire 32 formed by intertwining several nickel-titanium wires. One end of the outer connecting wire 32 is integrally formed with the bolt-removing part 1, and the other end is integrally formed with the protective part 2, ensuring the connection between the bolt-removing part 1 and the protective part 2, and facilitating the recycling operation.

[0074] Example 2

[0075] like Figure 3 , Figure 4As shown, the difference between this embodiment and Embodiment 1 is that the connecting part 3 is provided with a rotating connecting component 34, which consists of two tubular structures. Each tubular structure is fixedly connected to a portion of the filamentous connecting part 3. That is, one tubular structure is fixedly connected to the filamentous connecting part 3 at the proximal end, and the other tubular structure is fixedly connected to the filamentous connecting part 3 at the distal end. The opposite ends of the two tubular structures are rotatably connected. Because intracranial blood vessels are fragile, even minor damage to the vessels during surgery can lead to serious consequences. The rotating connecting component 3 allows the device to better conform to the natural curvature of the blood vessel during entry and operation. The thrombectomy part 1 and the protective part 2 can rotate relative to each other in real time according to the direction of the blood vessel, reducing friction and collision with the blood vessel wall. When passing through a narrow blood vessel segment, the protective part 2 can be rotated to make it fit more closely to the blood vessel wall, reducing stimulation to the vascular intima, lowering the risk of complications such as blood vessel rupture and dissection, and ensuring the patient's surgical safety.

[0076] In summary, this utility model combines a thrombectomy section 1 and a protective section 2, allowing the thrombectomy section 1 to perform the thrombectomy function while the protective section 2 prevents the embolus from escaping. For intracranial blood vessels and other vessels with small inner diameters and tortuous structures, this device has better positioning performance. At the same time, the integrated release can also reduce surgical steps and improve surgical efficiency.

[0077] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A protective device for intracranial thrombectomy, characterized in that, It includes a bolt-removing part (1), a protective part (2), and a connecting part (3); The distal end of the thrombectomy part (1) is connected to the connecting part (3); The connecting part (3) is remotely connected to the protection part (2), which is used to capture the escaped embolus; The protective part (2) is provided with a filter membrane (4), and the far end of the filter membrane (4) is contracted together towards the middle; A protective wire (5) is arranged circumferentially on the outer side of the protective part (2), and a filter membrane (4) is arranged between the protective wire (5) and the protective part (2). The proximal end of the protective wire (5) is connected to the connecting part (3), and the distal end of the protective wire (5) is gathered at the distal end of the protective part (2).

2. The intracranial thrombectomy protection device according to claim 1, characterized in that, Both the bolt-retrieving part (1) and the protective part (2) are bracket structures. The axial length and radial width of the bolt-retrieving part (1) and the protective part (2) can be the same or different.

3. The intracranial thrombectomy protection device according to claim 1, characterized in that, The filter membrane (4) is provided with a plurality of micropores for blood to pass through, the diameter of which is 80-120 μm.

4. The intracranial thrombectomy protection device according to claim 1, characterized in that, The protective part (2) is umbrella-shaped and is woven from nickel-titanium alloy wire.

5. The intracranial thrombectomy protection device according to claim 1, characterized in that, The connecting part is provided with a rotating component (34) that allows the bolt part (1) and the protective part (2) to rotate relative to each other.

6. The intracranial thrombectomy protection device according to claim 5, characterized in that, The rotating component (34) includes two tubes that are rotatably connected to each other. One tube is fixedly connected to the proximal part of the connecting part (3), and the other tube is fixedly connected to the distal part of the connecting part (3).

7. The intracranial thrombectomy protection device according to claim 1, characterized in that, Both the thrombus-removing part (1) and the protective part (2) are components made of nickel-titanium alloy.

8. An intracranial thrombectomy protection device according to any one of claims 1-7, characterized in that, The filter membrane (4) is a polyurethane membrane layer.

9. An intracranial thrombectomy protection device according to any one of claims 1-7, characterized in that, The connecting part (3) includes an outer connecting wire (32) formed by intertwining several nickel-titanium wires.

Images