Self-expanding degradable intravascular stent used in cerebral blood supply reconstruction

Abstract

The utility model discloses a self-expanding degradable intravascular stent used in cerebral blood supply reconstruction, which comprises a first elastic support body and a second elastic support body, and the first elastic support body and the second elastic support body are connected through a plurality of adjusting structures; the utility model relates to the technical field of medical apparatus and instruments, through the connection of a plurality of adjusting structures between the first elastic support body and the second elastic support body, the stable support of anastomotic stomas with different lengths and sizes is realized, and since the diameters of blood vessels of some patients are not uniform, the two fixing rods are connected with the outer sleeve, so that the fixing effect is good. The first elastic support body and the second elastic support body can independently support two sections of blood vessels with different diameters, the use range is wide, the snakelike elastic rod made of the polycaprolactone material can recover from a compressed state to a net-shaped structure state under the action of body temperature and can automatically adapt to the diameters of the blood vessels, and the supporting effect is ensured.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a self-expanding biodegradable vascular stent used in cerebral revascularization surgery. Background Technology

[0002] Cerebral revascularization plays a crucial role in the treatment of neurosurgical cerebrovascular diseases such as moyamoya disease and intracranial large vessel occlusion. A common surgical approach is end-to-side anastomosis, which is one of the most challenging techniques for small vessels. In current procedures, anastomotic support typically relies on surgical technique; however, due to the small vessel diameter, collapse is prone to occur during end-to-side anastomosis, placing high demands on the stability and precision of the anastomosis. This is especially true for young neurosurgeons, who often experience difficulties due to vessel collapse during vascular anastomosis, impacting surgical quality. Current technology lacks a stent solution that can provide stable anastomotic support and is fully biodegradable postoperatively.

[0003] While existing technologies may already offer solutions to the aforementioned problems, this case aims to provide an alternative or replacement technical solution. Utility Model Content

[0004] To address the problems mentioned in the background art, this utility model provides a self-expanding biodegradable vascular stent for use in cerebral revascularization surgery. It can automatically expand during surgery to provide support during anastomosis and rapidly degrade after anastomosis, thereby improving the stability and efficiency of the surgical procedure.

[0005] This utility model is achieved through the following technical solution: a self-expanding biodegradable vascular stent for use in cerebral revascularization surgery, comprising a first elastic support and a second elastic support, wherein the first elastic support and the second elastic support are connected by multiple adjustment structures;

[0006] Both the first elastic support and the second elastic support are composed of multiple support components, which are connected to each other in a circular array.

[0007] Each of the support components includes two elastic rods, each elastic rod is a serpentine structure, and the two elastic rods are symmetrically connected to each other, with a connector at the end of each elastic rod;

[0008] The plurality of adjustment structures are respectively disposed on the plurality of support components.

[0009] Preferably, each of the adjustment structures includes two fixed rods and an outer sleeve. The two fixed rods are respectively installed on the connectors in the first elastic support and the second elastic support, and the outer sleeve is movably fitted onto the two fixed rods.

[0010] Preferably, the connector has an elongated oval cross-section, and the diameter of the connector is the same as the diameter of the elastic rod, and the length of the connector is the same as the sum of the diameters of the two elastic rods.

[0011] Preferably, each of the two fixing rods has an anti-detachment block at one end located inside the outer sleeve.

[0012] Preferably, both ends of the outer sleeve are provided with sliding cavities, and the anti-slip block is matched with the sliding cavity.

[0013] Preferably, the two elastic rods, connectors, fixing rods, outer sleeves, and anti-detachment blocks are all flexible structures made of polycaprolactone material.

[0014] Preferably, both elastic rods, connectors, fixing rods, outer sleeves, and anti-detachment blocks are coated with a dissolving layer.

[0015] Beneficial effects

[0016] This invention provides a self-expanding biodegradable vascular stent for use in cerebral revascularization surgery. Compared with existing technologies, it has the following advantages: Through multiple adjustable structures connecting the first and second elastic supports, stable support for anastomoses of different lengths is achieved. Since some patients have uneven blood vessel diameters, the connection between the two fixing rods and the outer sleeve allows the first and second elastic supports to independently support two blood vessels of different diameters, resulting in a wide range of applications. The serpentine elastic rods made of polycaprolactone can recover from a compressed state to a mesh structure under body temperature, automatically adapting to the blood vessel diameter and ensuring support effectiveness. Simultaneously, the dissolving layer coated on the stent surface accelerates the degradation process. Injecting enzyme solutions or weakly acidic solutions through a catheter allows the stent to degrade completely within minutes and ultimately be absorbed by the blood. The operation is simple and convenient. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a self-expanding biodegradable vascular stent used in cerebral revascularization surgery according to the present invention.

[0018] Figure 2 This is a schematic diagram of the main structure of a self-expanding biodegradable vascular stent used in cerebral revascularization surgery according to the present invention.

[0019] Figure 3 This is a partial frontal sectional view of a self-expanding biodegradable vascular stent used in cerebral revascularization surgery according to the present invention.

[0020] In the diagram: 1. Support component, 101. Elastic rod, 102. Connector, 2. Adjustment structure, 201. Fixing rod, 202. Outer sleeve, 203. Anti-detachment block, 204. Sliding cavity. Detailed Implementation

[0021] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] Example: Please refer to Figure 1-3 A self-expanding biodegradable vascular stent for use in cerebral revascularization surgery includes a first elastic support and a second elastic support, which are connected by multiple adjustment structures 2.

[0023] Specifically, both the first elastic support and the second elastic support are composed of multiple support components 1, which are interconnected in a circular array.

[0024] Specifically, each support component 1 includes two elastic rods 101, each elastic rod 101 is a serpentine structure, and the two elastic rods 101 are symmetrically connected to each other. Each end of the two elastic rods 101 is provided with a connector 102.

[0025] Specifically, multiple adjustment structures 2 are respectively installed on multiple support components 1.

[0026] As a preferred and further option, each adjustment structure 2 includes two fixed rods 201 and an outer sleeve 202. The two fixed rods 201 are respectively installed on the connectors 102 in the first elastic support and the second elastic support, and the outer sleeve 202 is movably fitted onto the two fixed rods 201.

[0027] It should be noted that medical personnel can stretch or contract the two fixed rods 201 on both sides according to the length of the blood vessel to be supported, so that the two fixed rods 201 can move on the outer sleeve 202, thereby adjusting the distance between the first elastic support and the second elastic support on both sides, expanding the scope of application. The first elastic support and the second elastic support are both composed of multiple support components 1, which are connected to each other in a circular array, ensuring that the stent can adapt to the natural curvature of the blood vessel. The device is in a compressed state when not in use. The connector 102 is used to connect the two symmetrically arranged elastic rods 101, which are delivered to the anastomosis position through a syringe delivery system. The elastic rods 101 in each support component 1 are activated by body temperature, causing the serpentine elastic rods 101 to expand and unfold into a mesh, automatically adapting to the diameter of the blood vessel and providing support for the anastomosis. Since some patients have uneven blood vessel diameters, the connection between the two fixed rods 201 and the outer sleeve 202 allows the first elastic support and the second elastic support to independently support two blood vessels with different diameters, thus broadening the scope of application.

[0028] As a preferred and further option, the two elastic rods 101, the connector 102, the fixing rod 201, the outer sleeve 202, and the anti-detachment block 203 are all flexible structures made of polycaprolactone material. Caprolactone material has shape memory properties. Under the action of body temperature, the first elastic support and the second elastic support recover from the compressed state to the original mesh structure, ensuring the support of the anastomosis.

[0029] Preferably, the two elastic rods 101, connector 102, fixing rod 201, outer sleeve 202, and anti-dislodgement block 203 are all coated with a dissolving layer. The dissolving layer can be a water-soluble polymer, such as polyethylene glycol or PEG, to accelerate the degradation process. After the anastomosis is completed, an enzyme solution is injected through the catheter. Under the action of the dissolving layer, the rapid degradation of polycaprolactone is triggered, so that the stent is completely degraded within a few minutes. A weakly acidic solution can also be used to accelerate the degradation. Under the action of the solution, the stent is decomposed into small molecules and is eventually absorbed by blood metabolism.

[0030] Preferably, the connector 102 has an elongated oval cross-sectional shape, and the diameter of the connector 102 is the same as the diameter of the elastic rod 101. The length of the connector 102 is the same as the sum of the diameters of the two elastic rods 101, so as to prevent the outer edge of the connector 102 from exceeding the outer surface of the elastic rod 101 and to prevent abrasion of the inner wall of the blood vessel.

[0031] As a preferred and further option, each of the two fixing rods 201 is provided with an anti-detachment block 203 at one end inside the outer sleeve 202 to prevent the two fixing rods 201 from detaching from the outer sleeve 202.

[0032] Preferably, further, both ends of the outer sleeve 202 are provided with sliding cavities 204, and the anti-detachment block 203 is matched with the sliding cavity 204 to move the anti-detachment block 203 during sliding.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A self-expanding biodegradable vascular stent for use in cerebral revascularization surgery, comprising a first elastic support and a second elastic support, characterized in that, The first elastic support and the second elastic support are connected by multiple adjustment structures (2); Both the first elastic support and the second elastic support are composed of multiple support components (1), and the multiple support components (1) are connected to each other in a circular array. Each of the support components (1) includes two elastic rods (101), each elastic rod (101) is a serpentine structure, and the two elastic rods (101) are symmetrically connected to each other. Each end of the two elastic rods (101) is provided with a connector (102). The multiple adjustment structures (2) are respectively disposed on the multiple support components (1).

2. The self-expanding biodegradable vascular stent used in cerebral revascularization surgery according to claim 1, characterized in that, Each of the adjustment structures (2) includes two fixed rods (201) and an outer sleeve (202). The two fixed rods (201) are respectively installed on the connectors (102) in the first elastic support and the second elastic support. The outer sleeve (202) is movably fitted onto the two fixed rods (201).

3. The self-expanding biodegradable vascular stent used in cerebral revascularization surgery according to claim 1, characterized in that, The connector (102) has an elongated oval cross-section, and the diameter of the connector (102) is the same as the diameter of the elastic rod (101). The length of the connector (102) is the same as the sum of the diameters of the two elastic rods (101).

4. The self-expanding biodegradable vascular stent used in cerebral revascularization surgery according to claim 2, characterized in that, Each of the two fixing rods (201) has an anti-detachment block (203) at one end inside the outer sleeve (202).

5. A self-expanding biodegradable vascular stent for cerebral revascularization surgery according to claim 4, characterized in that, The outer sleeve (202) has sliding cavities (204) at both ends, and the anti-detachment block (203) matches the sliding cavity (204).

6. A self-expanding biodegradable vascular stent for cerebral revascularization surgery according to claim 1, characterized in that, The two elastic rods (101), connector (102), fixing rod (201), outer sleeve (202) and anti-detachment block (203) are all flexible structures made of polycaprolactone material.

7. A self-expanding biodegradable vascular stent for cerebral revascularization surgery according to claim 1, characterized in that, The two elastic rods (101), connector (102), fixing rod (201), outer sleeve (202) and anti-detachment block (203) are all coated with a dissolving layer.

Images