Intracranial embolism support with protection device
By setting a protective device with a smaller mesh at the distal end of the stent with the intracranial embolization belt protection device, combining the balloon structure and nickel-titanium alloy material, the distal vascular embolization problem caused by thrombosis is solved, and small embolism is achieved effective interception and improved surgical safety.
Patent Information
- Application Number
- CN202323429407.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-15
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2033-12-15
AI Technical Summary
During the treatment of carotid artery slow closure and opening/intracranial artery slow closure and opening/vertebral artery opening stenosis, thrombosis/dissection cannot be accurately judged, resulting in thrombosis drop and distal vascular embolism. Existing treatment plans such as double balloon technology, The protective umbrella technology and Basis technology have problems such as inconsistency, out of control of the pre-expanding process, or excessive mesh.
A stent with a protective device with an intracranial embolization belt is designed. The internal distal end is equipped with a protective device with a smaller mesh. It adopts a balloon structure and a nitinol alloy material. The stent body and the protective device are connected through braiding to form a double-layer structure to enhance it. Intercept the effect and achieve rapid expansion and contraction on the guidewire.
Effectively intercept small emboli with smaller volumes to avoid escape, improve surgical safety, and ensure the patency of distal blood vessels.
Smart Images
Figure CN222237755U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of thrombus removal brackets, in particular to a bracket with a protective device for intracranial embolism. Background Art
[0002] Currently, during the treatment of carotid artery slow occlusion and recanalization / intracranial artery slow occlusion and recanalization / vertebral artery stenosis, due to the occlusion of the anterior vessels, it is impossible to accurately judge thrombosis / dissection / thrombosis and dissection. During the recanalization process, emboli often fall, causing distal vascular embolism.
[0003] For the problem of thrombus falling to the distal end, the existing treatment options include double-balloon technology (i.e., balloons are placed in the common jugular, external jugular and distal internal jugular for protection, but the disadvantage is that angiography cannot be performed and it is not suitable for patients with only external jugular compensation), umbrella technology (i.e., the umbrella is currently placed at the distal end for protection, the disadvantage is that the umbrella needs to be pre-dilated, and there is no blood flow control at the proximal end during the expansion process, which can easily cause distal embolism; if the blood vessel is tortuous or the lesion is too high, the umbrella cannot find a verified landing point and cannot be raised too high), proximal balloon distal umbrella (both front and back are controlled, the disadvantage is that adapters need to be prepared before the operation), and Basis technology (can be operated in most blood vessels, but the mesh of the distal basket of the thrombectomy stent is too large, and small emboli can easily escape). Utility Model Content
[0004] In order to solve the above technical problems, the utility model provides a stent with an intracranial embolism protection device. A protective device with a smaller mesh is arranged at the inner distal end of the stent body, which can effectively intercept smaller emboli and prevent them from escaping from the stent body to the distal end, thereby avoiding distal vascular embolism and improving the safety of the operation.
[0005] The utility model solves the technical problem by adopting the following technical solution: a stent with a protective device for intracranial embolism comprises a stent body and a protective device arranged on a guide wire;
[0006] The stent body is a basket structure with a mesh body covering the distal end;
[0007] The protective device is provided at the inner distal end of the stent body;
[0008] The protection device is a mesh body with meshes smaller than the support body.
[0009] In this solution, a protective device is arranged at the inner distal end of the stent body, and the mesh of the protective device is smaller, which can block small emboli with smaller volume in the blood vessel and prevent them from escaping. The distal end of the stent body is also covered with a mesh, which can restrict the protective device and prevent it from moving to the outside of the stent body.
[0010] Preferably, the protective device is a balloon structure, and the side wall of the balloon structure is a mesh body. The balloon structure has a better support effect, and a double-layer structure is formed in the axial direction of the stent, and the interception effect is also better.
[0011] Preferably, the proximal mesh of the balloon structure is larger than the distal mesh, so that the thrombus can be intercepted in layers, and the smaller the distal mesh, the better the interception effect. After the thrombus is cut at the proximal end, the distal end can intercept it to prevent it from escaping.
[0012] Preferably, the proximal end of the balloon structure is thinner than the core wire at the distal end, so that a larger thrombus can be cut into smaller pieces more easily without escaping from the distal end.
[0013] Preferably, the stent body and / or the protective device are made of nickel-titanium alloy, that is, memory metal, the same material as the existing stent body, and automatically form a stent structure and an interception structure after being removed from the catheter, which does not conflict with the existing stent and has good compatibility.
[0014] Preferably, the stent body is laser engraved on a thin-walled nickel-titanium alloy, which has better integrity and can form larger meshes, thus achieving better thrombus cutting and clearing effects.
[0015] Preferably, the stent body and the protective device go in and out of the catheter together with the guide wire to perform contraction and expansion actions, that is, when the stent body is opened, the protective device is also opened together, so as to be able to intercept quickly and timely.
[0016] Preferably, the bracket body is provided with a barb inwardly, and the barb is hooked with the protection device. The protection devices can be fixed to each other by the barb.
[0017] Preferably, the barb is offset toward one side of the proximal end of the stent body. After the protective device is hooked, a stable connection structure can be maintained to prevent the two from loosening and separating.
[0018] Preferably, the periphery of the stent body and the periphery of the protective device are connected by weaving, so that the stent body and the protective device can be fixed together more integrally, the connection is more firm, and synchronous deployment can be achieved more easily.
[0019] Beneficial effects of the utility model:
[0020] This solution sets a smaller mesh protection device at the inner distal end of the stent body, which can effectively intercept smaller emboli and prevent them from escaping from the stent body to the distal end, avoid distal vascular embolism, and improve the safety of the operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only three of the drawings of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0022] Figure 1 This is a schematic diagram of Embodiment 1 of the present utility model;
[0023] Figure 2 This is a schematic diagram of a bracket body according to Embodiment 2 of the present utility model;
[0024] Figure 3 This is a schematic diagram of Embodiment 3 of the present utility model;
[0025] Among them, 1. guide wire; 2. catheter; 3. stent body; 4. protective device; 5. hook; 6. braided structure. DETAILED DESCRIPTION
[0026] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.
[0027] Example
[0028] like Figure 1 As shown, the stent with a protective device for intracranial embolism comprises a stent body 3 and a protective device 4 arranged on a guide wire 1; the stent body 3 is a basket structure with a mesh body covered at the distal end; the protective device 4 is arranged at the distal end of the inner part of the stent body 3; the protective device 4 is a mesh body with a mesh smaller than that of the stent body 3.
[0029] In this solution, a protective device 4 is arranged at the inner distal end of the stent body 3, and the mesh of the protective device 4 is smaller, which can block small emboli with smaller volume in the blood vessel and prevent them from escaping. The distal end of the stent body 3 is also covered with a mesh, which can restrict the protective device 4 and prevent it from moving to the outside of the stent body 3.
[0030] The protective device 4 is a balloon structure, and the side wall of the balloon structure is a mesh body. The balloon structure has a better support effect, and a double-layer structure is formed in the axial direction of the stent, and the interception effect is also better.
[0031] The proximal mesh of the balloon structure is larger than the distal mesh, so it can intercept in layers, and the smaller the distal mesh, the better the interception effect.
[0032] The stent body 3 and the protective device 4 are made of nickel-titanium alloy, that is, memory metal, the same material as the existing stent body 3, and automatically form a stent structure and an interception structure after being removed from the catheter 2, which does not conflict with the existing stent and has good compatibility.
[0033] The stent body 3 is laser engraved on a thin-walled nickel-titanium alloy, which has better integrity and can form larger meshes, thus achieving better thrombus cutting and clearing effects.
[0034] The stent body 3 and the protective device 4 go in and out of the catheter 2 together with the guide wire 1, and perform contraction and expansion actions. That is, when the stent body 3 is opened, the protective device 4 is also opened together, so that it can be intercepted quickly and timely. The stent and the protective device 4 are a composite structure, and they are opened together when they go out of the catheter 2.
[0035] In this solution, a protective device 4 with a smaller mesh is arranged at the inner distal end of the stent body 3, which can effectively intercept smaller emboli and prevent them from escaping from the stent body 3 to the distal end, thereby avoiding distal vascular embolism and improving the safety of the operation.
[0036] Example 2
[0037] Combination Figure 2 As shown, compared with Example 1, this embodiment also includes the following differences. In this embodiment, the stent body 3 adopts a braided structure, and the stent body 3 is provided with a barb 5 inwardly, and the barb 5 is hooked with the protective device 4. The protective devices 4 can be fixed to each other by the barb 5, and the barb 5 is offset to one side of the proximal end of the stent body 3. After hooking the protective device 4, a stable connection structure can be maintained to prevent the two from loosening and separating. The proximal end of the balloon structure is thinner than the core wire at the distal end. It is easier to cut a larger thrombus into a smaller size, but it will not escape from the distal end.
[0038] Example 3
[0039] Combination Figure 3 As shown, compared with Embodiment 1, in this embodiment, the periphery of the bracket body 3 and the periphery of the protection device 4 are connected by weaving. Figure 3 The braided structure 6 can fix the support body 3 and the protective device 4 together more integrally, the connection is more firm, and synchronous deployment can be achieved more easily.
[0040] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0041] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.
Claims
1. A stent with a protective device for intracranial embolism, characterized in that: It comprises a stent body (3) and a protective device (4) arranged on a guide wire (1); The stent body (3) is a basket structure with a mesh body covering the distal end; The protective device (4) is arranged at the inner distal end of the support body (3); The protective device (4) is a mesh body with meshes smaller than those of the support body (3).
2. The stent with a protective device for intracranial embolism according to claim 1, characterized in that: The protective device (4) is a balloon structure, and the side wall of the balloon structure is a mesh body.
3. The stent with a protective device for intracranial embolism according to claim 2, characterized in that: The proximal side mesh of the balloon structure is larger than the distal side mesh.
4. The stent of the intracranial embolism protection device according to claim 3, characterized in that: The core wire at the proximal end of the balloon structure is thinner than that at the distal end.
5. The stent of the intracranial embolism protection device according to claim 1, characterized in that: The support body (3) and / or the protective device (4) are made of nickel-titanium alloy.
6. The stent of the intracranial embolism protection device according to claim 1, characterized in that: The support body (3) is laser engraved on a thin-walled nickel-titanium alloy.
7. The stent of the intracranial embolism protection device according to claim 1, characterized in that: The stent body (3) and the protective device (4) enter and exit the catheter (2) along with the guide wire (1), and perform contraction and expansion actions.
8. The stent of the intracranial embolism protection device according to claim 1, characterized in that: The support body (3) is provided with a barb (5) inwardly, and the barb (5) is hooked with the protection device (4).
9. The stent of the intracranial embolism protection device according to claim 8, characterized in that: The barb (5) is offset toward one side of the proximal end of the stent body (3).
10. The stent of the intracranial embolism protection device according to claim 1, characterized in that: The periphery of the support body (3) and the periphery of the protection device (4) are connected by weaving.