Carotid artery stenosis stent

Abstract

The utility model provides a carotid artery stenosis stent, and belongs to the technical field of carotid artery stents. Comprising a plurality of sub-supporting frames which are sequentially connected, each sub-supporting frame is in a truncated cone shape with a large-diameter end and a small-diameter end, the large-diameter ends of all the sub-supporting frames face the same direction, and in any two adjacent sub-supporting frames, the diameter of the large-diameter end of the sub-supporting frame close to the far end is not larger than that of the small-diameter end of the sub-supporting frame close to the near end; the technical problems that an existing carotid artery stenosis stent is prone to damaging blood vessels and cannot be fully attached to or support the blood vessels are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of carotid artery stents, and in particular relates to a carotid artery stenosis stent. Background Art

[0002] Carotid artery stenosis is a common disease, including both congenital and acquired causes. This disease can severely impair blood flow, leading to insufficient blood and oxygen supply to the entire body. Currently, the main treatments for carotid stenosis include medical medication, carotid endarterectomy (CEA), and carotid angioplasty and stenting (CAS). Over the past 20 years, with the increasing maturity of neuroimaging and neurointerventional techniques, improvements in interventional materials, and enhanced operator skills, carotid stenting has become the mainstay of treatment for carotid stenosis due to its safety, effectiveness, minimal invasiveness, and significant efficacy.

[0003] In clinical practice, it is found that stenosis often occurs in the carotid artery bifurcation area, such as Figure 1 As shown in the figure, the diameters of blood vessels at normal bifurcations are usually not uniform, while the one-piece stents used in daily life are uniform. In actual use, the one-piece stents with uniform diameters are prone to the following problems:

[0004] 1) When a stent of equal diameter is implanted in a blood vessel and expands, it will over-support the smaller diameter area and easily damage the smaller diameter segment of the blood vessel;

[0005] 2) The one-piece stent has insufficient axial bending capacity and is not easy to fit and support curved blood vessels.

[0006] Therefore, it is necessary to provide an improved technical solution to the above-mentioned deficiencies in the prior art. Utility Model Content

[0007] The purpose of the utility model is to provide a carotid artery stenosis stent to solve the technical problems that the existing carotid artery stenosis stents are prone to damage blood vessels and cannot fully fit and support the blood vessels.

[0008] In order to achieve the above objectives, the present invention provides the following technical solutions for carotid artery stenosis stent:

[0009] A carotid artery stenosis stent comprises a plurality of sequentially connected sub-supports, each of the sub-supports being of a truncated cone shape with a large diameter end and a small diameter end, the large diameter ends of all the sub-supports being oriented in the same direction, and, of any two adjacent sub-supports, the large diameter end of the sub-support closer to the distal end is no larger than the small diameter end of the sub-support closer to the proximal end.

[0010] As a further optimized technical solution, the sub-support frame has three sections, the sub-support frames at both ends are open-loop frames, and the sub-support frame in the middle is a closed-loop frame.

[0011] As a further optimized technical solution, the side wall thickness of the sub-support frame in the middle is greater than the thickness of the sub-support frames at both ends.

[0012] As a further optimized technical solution, the mesh on the distal sub-support frame is circular or approximately circular, and the diameter of the distal sub-support frame decreases uniformly from the large diameter end to the small diameter end.

[0013] As a further optimized technical solution, the mesh on the proximal sub-support frame is circular or approximately circular, and the diameter of the proximal sub-support frame decreases evenly from the large diameter end to the small diameter end.

[0014] As a further optimized technical solution, any two of the sub-support frames are fixedly connected by a plurality of connection structures arranged at circumferential intervals.

[0015] As a further optimized technical solution, the connection structure has two buckles, which are connected together to achieve a fixed connection.

[0016] As a further optimized technical solution, the buckle has a support plate, on which a spring plate is provided, one end of the spring plate is fixedly connected to the support plate, and the other end presses the support plate.

[0017] As a further optimized technical solution, the shrapnel is made of stainless steel or nickel-titanium alloy.

[0018] As a further optimized technical solution, the mesh size on the sub-support frame in the middle is smaller than the mesh size on the sub-support frames at both ends.

[0019] Beneficial effects: The stent provided by the present invention is provided with multiple sections of sub-support frames connected in sequence, so that the overall flexibility of the stent is better than that of an integrally formed stent, thereby making the stent have stronger axial bending ability, thereby facilitating fitting and supporting curved blood vessels, and achieving better therapeutic effects; in addition, each section of the sub-support frame is a truncated cone with a large diameter end and a small diameter end, the large diameter ends of all sub-support frames are oriented in the same direction, and of any two adjacent sub-support frames, the diameter of the large diameter end of the sub-support frame near the distal end is not larger than the diameter of the small diameter end of the sub-support frame near the proximal end, so that the overall diameter of the stent is more in line with the diameter change of the blood vessel and more adaptable to the shape of the blood vessel, thereby helping to reduce damage to the stent while supporting the blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting part of this application are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention.

[0021] Figure 1 This is a schematic diagram of the location of the carotid artery bifurcation;

[0022] Figure 2 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0023] Figure 3 This is a schematic diagram of the overall structure of a proximal terminal support frame according to an embodiment of the present invention;

[0024] Figure 4 The figure shows the overall structure of the remote terminal support frame according to one embodiment of the present invention.

[0025] In the figure: 1, sub-support frame; 101, large diameter end; 102, small diameter end; 2, buckle; 201, support plate; 202, spring piece. DETAILED DESCRIPTION

[0026] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0027] In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. In addition, in the description of the present invention, the term "proximal end" refers to the end close to the operator, and "distal end" refers to the end away from the operator.

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0029] The utility model provides a carotid artery stenosis stent, which improves the overall flexibility of the carotid artery stenosis stent through a multi-section arrangement. At the same time, all sub-support frames are arranged into a truncated cone shape with a large-diameter end and a small-diameter end, so that the carotid artery stenosis stent as a whole can better adapt to blood vessels with variable diameters and reduce damage to blood vessels.

[0030] like Figure 2 、 Figure 3 、 Figure 4 As shown, the carotid artery stenosis stent comprises multiple sections of sequentially connected sub-stents 1. Each section of the sub-stent 1 is in the shape of a truncated cone with a large diameter end 101 and a small diameter end 102. The large diameter ends 101 of all sub-stents 1 face the same direction, and of any two adjacent sub-stents 1, the diameter of the large diameter end 101 of the sub-stent 1 near the distal end is no larger than the diameter of the small diameter end 102 of the sub-stent 1 near the proximal end. In this embodiment, the diameter of the large diameter end 101 of the sub-stent 1 near the distal end is equal to the diameter of the small diameter end 102 of the sub-stent 1 near the proximal end. At the same time, the diameter of all sub-stents 1 decreases uniformly from the large diameter end 101 to the small diameter end 102. In this way, the diameter of the entire carotid artery stenosis stent changes uniformly at the connection locations of the sub-stents 1, thereby better supporting and adhering to the blood vessel.

[0031] In this embodiment, the sub-support frame 1 has three sections, the sub-support frames 1 at both ends are open-loop supports, and the sub-support frame 1 in the middle is a closed-loop support. The large end diameter of the proximal sub-support frame 1 is 6-7.5 mm, and the large end diameter of the distal sub-support frame 1 is 5-6 mm. The mesh size on the closed-loop support is smaller than the mesh size on the sub-support frames 1 at both ends, and the supporting force of the closed-loop support is higher than that of the open-loop support. The high supporting force of the sub-support frame 1 in the middle helps to ensure the stability of the position of the entire support, and the smaller mesh design helps to reduce the risk of plaque prolapse and falling off.

[0032] Furthermore, in order to further ensure the supporting force of the sub-support frame 1 in the middle, the side wall thickness of the sub-support frame 1 in the middle is greater than the thickness of the sub-support frames 1 at both ends.

[0033] In this embodiment, the meshes on the distal and proximal sub-stents 1 are circular or approximately circular, and their diameters decrease uniformly from the large-diameter end 101 to the small-diameter end 102. This ensures that the meshes can adapt to changes in blood vessel diameter and maintain sufficient support force while ensuring plug-blocking performance.

[0034] Furthermore, any two sub-support frames 1 are fixedly connected by a plurality of connection structures arranged at circumferential intervals. The connection structures are arranged at intervals so that the sub-support frames 1 are not completely butted together, that is, the connection strength at the connection position of the sub-support frames 1 is low, which reduces the driving force required for bending, thereby ensuring that the bending performance at the connection position is better than that of an integrally formed stent, thereby making it easier to fit the inner wall of the blood vessel. In this embodiment, the connection structure has two buckles 2, each of which has a support sheet 201, which is welded and fixed to the sub-support frame 1. A spring 202 is provided on one side of the support sheet 201, and one end of the spring 202 is fixedly connected to the support sheet 201, and the other end presses the support sheet 201 to form a structure similar to a clip. When the two buckles 2 are butted together, each spring 202 is respectively inserted into the space between the support sheet 201 and the spring 202 of the other buckle 2 to achieve a fixed connection, and then welding can be performed to ensure the stability of the connection. The buckle 2 is made of a material with a certain degree of elasticity, such as medical stainless steel or nickel-titanium alloy.

[0035] Specifically, during use, the carotid artery stenosis stent is first compressed as a whole into the delivery sheath, and then the delivery sheath is pushed to the location of the diseased blood vessel. After that, the compressed stent is pushed out of the delivery sheath into the blood vessel. After the stent automatically expands, it evenly supports the diseased and narrowed blood vessel segment. The overall variable-diameter stent is more adaptable and can better fit the variable-diameter blood vessel, thereby minimizing damage to the blood vessel while ensuring the treatment effect.

[0036] It will be understood that the above description is merely exemplary and the embodiments of the present application do not limit this.

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A carotid artery stenosis stent, characterized in that: The invention comprises a plurality of sub-support frames (1) connected in sequence, each of the sub-support frames (1) being a truncated cone having a large diameter end (101) and a small diameter end (102), the large diameter ends (101) of all the sub-support frames (1) facing the same direction, and in any two adjacent sub-support frames (1), the diameter of the large diameter end (101) of the sub-support frame (1) near the distal end is not greater than the diameter of the small diameter end (102) of the sub-support frame (1) near the proximal end; Any two of the sub-support frames (1) are fixedly connected via a plurality of connection structures arranged at circumferential intervals.

2. The carotid artery stenosis stent according to claim 1, characterized in that: The sub-support frame (1) has three sections, the sub-support frames (1) at both ends are open-loop frames, and the sub-support frame (1) in the middle is a closed-loop frame.

3. The carotid artery stenosis stent according to claim 2, characterized in that: The thickness of the side wall of the sub-support frame (1) in the middle is greater than the thickness of the sub-support frames (1) at both ends.

4. The carotid artery stenosis stent according to claim 3, characterized in that: The mesh on the distal sub-support frame (1) is circular, and the diameter of the distal sub-support frame (1) decreases evenly from the large-diameter end (101) to the small-diameter end (102).

5. The carotid artery stenosis stent according to claim 3, characterized in that: The mesh on the proximal sub-support frame (1) is circular, and the diameter of the proximal sub-support frame (1) decreases evenly from the large-diameter end (101) to the small-diameter end (102).

6. The carotid artery stenosis stent according to claim 1, characterized in that: The connection structure comprises two buckles (2), and the two buckles (2) are butted together to achieve a fixed connection.

7. The carotid artery stenosis stent according to claim 6, characterized in that: The buckle (2) has a support plate (201), and a spring plate (202) is provided on the support plate (201). One end of the spring plate (202) is fixedly connected to the support plate (201), and the other end presses the support plate (201).

8. The carotid artery stenosis stent according to claim 7, characterized in that: The shrapnel (202) is made of stainless steel or nickel-titanium alloy.

9. The carotid artery stenosis stent according to any one of claims 2 to 5, characterized in that: The mesh size on the sub-support frame (1) in the middle is smaller than the mesh size on the sub-support frames (1) at both ends.

Images