An occluder

Abstract

This invention relates to an occluder, comprising a plug body woven from multiple shape memory alloy wires. The welding points of the multiple shape memory alloy wires are located at the proximal end of the plug body, and there are no welding points at the distal end of the plug body. The outer periphery of the plug body is bent to form multiple anti-dislodgement rings. The cross-section of each anti-dislodgement ring is triangular, and the three points of the triangle are A, B, and C. Points A and B are located radially inside point C, and point A is closer to the distal end of the plug body than point B. Axially, point C is located at the same position as point B, or point C is located proximal to point B. After deployment, the occluder can anchor within the aneurysm, preventing dislodgement.

Description

Technical Field

[0001] This invention belongs to the field of medical technology, specifically relating to an occluder. Background Technology

[0002] During the treatment of aneurysms, a method of filling the aneurysm with a spring coil can be used to form a thrombus within the aneurysm, thereby preventing the aneurysm from further expanding, rupturing, and bleeding. This method requires a long time to fill with the spring coil and there is a possibility that the spring coil may be partially located inside the blood vessel, thus affecting blood flow.

[0003] The prior art CN114948360A discloses an easy-to-assemble intra-aneurysmal flow disturbance device, which sets a flow disturbance net inside the aneurysm to block the aneurysm opening. However, the flow disturbance net is columnar after unfolding, which poses a risk of detaching from the aneurysm. Summary of the Invention

[0004] In view of this, the present invention provides an occluder that can be anchored within the tumor after deployment, thus preventing detachment.

[0005] The technical solution adopted in this invention:

[0006] An occluder includes a plug body woven from multiple shape memory alloy wires, wherein the welding points of the multiple shape memory alloy wires are located at the proximal end of the plug body, and there are no welding points at the distal end of the plug body.

[0007] The outer periphery of the plug body is bent to form multiple anti-detachment rings. The cross-section of the anti-detachment ring is triangular, and the three points of the triangle are A, B and C. Points A and B are located radially inside point C. Point A is closer to the distal end of the plug body than point B. In the axial direction of the plug body, point C is located at the same position as point B, or point C is located on the proximal side of point B.

[0008] Preferably, a plurality of anti-detachment rings are arranged at equal intervals along the axial direction of the plug body.

[0009] Preferably, a release head is connected to the welding point.

[0010] Preferably, the proximal end of the plug body forms a proximal end face, the center of the proximal end face is recessed towards the distal end, so that the proximal end face forms a conical surface, the welding point is located at the cone point of the conical surface, and the release head is located within the conical space enclosed by the conical surface.

[0011] Preferably, the distance between point B and the axis of the plug is S1, the axial distance between point C and point B is S2, and the ratio of S2 to S1 is 1:(6-10).

[0012] Preferably, the distance between point A and point B is S3, and the ratio of S3 to S2 is (8-10):(8-10).

[0013] Preferably, the plug body is spherical, and the distance between two adjacent anti-detachment rings along the axial direction of the plug body is 0.

[0014] Preferably, the plug body is columnar, and the distance between adjacent anti-detachment rings along the axial direction of the plug body is S4, the distance between point A and point B is S3, and S4:S3 is (8-10):(8-10).

[0015] The beneficial effects of this invention are:

[0016] After the occluder of the present invention is delivered into the aneurysm by the delivery device, the occluder unfolds. Since an anti-dislodgement ring is formed on the outer periphery of the plug body, which is equivalent to a barb facing the proximal end, the anti-dislodgement ring can hook onto the inner wall of the aneurysm when the occluder moves toward the aneurysm opening, preventing the occluder from falling out of the aneurysm. Attached Figure Description

[0017] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0018] Figure 1 This is a schematic diagram of one embodiment of the occlusion device of the present invention;

[0019] Figure 2 This is a schematic diagram of another implementation of the plugging device.

[0020] Among them: 1. Plug body; 11. Main body; 12. Anti-detachment ring; 13. Proximal end face. Detailed Implementation

[0021] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail, but well-known methods, processes, procedures, and elements are not described in detail in order to avoid obscuring the essence of the present invention.

[0022] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0023] Unless the context explicitly requires it, the words "comprising," "including," and similar terms throughout the specification and claims should be interpreted as encompassing rather than being exclusive or exhaustive; that is, meaning "including but not limited to."

[0024] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0025] Using the surgical procedure as a reference, the side closer to the patient's body is designated as "far," and the side closer to the operator is designated as "near."

[0026] See Figure 1 and Figure 2 The present invention provides an occluder for use in aneurysm surgery, comprising a plug body 1 woven from multiple shape memory alloy wires, wherein the welding points of the multiple shape memory alloy wires are located at the proximal end of the plug body 1, and there are no welding points at the distal end of the plug body 1.

[0027] The outer periphery of the plug body 1 is bent to form multiple anti-detachment rings 12. The cross-section of the anti-detachment ring 12 is triangular, and the three points of the triangle are A, B and C. Point A and B are located radially inside point C. Point A is closer to the distal end of the plug body 1 than point B. In the axial direction of the plug body 1, point C is located at the same position as point B, or point C is located on the proximal side of point B.

[0028] When performing aneurysm surgery using an occluder, the occluder is first delivered to the aneurysm via a delivery device, and then released. Because the occluder is woven from shape memory alloy wire, it expands after unfolding, allowing the outer periphery of the occluder body 1 to adhere to the inner wall of the aneurysm. The outer periphery of the occluder body 1 bends to form an anti-dislodgement ring 12, which circumferentially wraps around the axial direction of the occluder body 1 (the axial direction being the proximal direction of the occluder body 1). Therefore, the anti-dislodgement ring 12 directly adheres to the inner wall of the aneurysm. The cross-section of the anti-dislodgement ring 12 is triangular, with point C convex outward. In the axial direction, point C is at the same position as point B, or point C is located proximal to point B, making ∠ABC a right angle or an obtuse angle. This makes the cross-section of the anti-dislodgement ring 12 hook-shaped, with point C facing the aneurysm opening. Therefore, in some extreme cases, such as when blood flow moves the occluder towards the aneurysm opening, the anti-dislodgement ring 12 can hook onto the inner wall of the aneurysm, thereby preventing the occluder from detaching from the aneurysm.

[0029] Multiple anti-dislodgement rings 12 are installed to further enhance the occluder's ability to anchor in the aneurysm and prevent the occluder from dislodging.

[0030] When making the plug, the plug body 1 is first woven from multiple shape memory alloy wires, and then the plug body 1 is thermoformed to form multiple anti-detachment rings 12. The shape memory alloy wires can be nickel-titanium alloy wires.

[0031] Because the occluder is made of shape memory alloy wire and has a mesh-like structure, it can be compressed and confined within the sheath. This allows it to be delivered within the blood vessel to the aneurysm. Once inside the aneurysm, the occluder is released, unfolds, and becomes lodged within the aneurysm, sealing the aneurysm opening.

[0032] Multiple anti-dislodgement rings 12 are evenly spaced along the axial direction of the plug body 1. This allows the anti-dislodgement rings 12 to make relatively uniform contact with the inner wall of the aneurysm, improving the anchoring ability of the anti-dislodgement rings 12.

[0033] A release head is connected at the welding point. During the operation, the release head is connected to the distal end of the push rod of the delivery device. When the occluder reaches the aneurysm, the sheath is withdrawn backward, and the push rod presses against the occluder from the rear, so that the occluder is exposed from the sheath. After the occluder is fully exposed, the push rod can be separated from the release head, the occluder unfolds, and the aneurysm can be sealed.

[0034] The distal end of the plug body 1 has no welding points. When the occluder is released, the distal end of the occluder is relatively smooth and will not puncture the aneurysm.

[0035] like Figure 1 In the embodiment shown, the proximal end of the plug body 1 forms a proximal end face 13, the center of the proximal end face 13 is recessed toward the distal end, so that the proximal end face 13 forms a conical surface, the welding point is located at the cone point of the conical surface, and the release head is located within the conical space enclosed by the conical surface.

[0036] When the occluder is located within the aneurysm, the proximal face 13 is basically located at the aneurysm opening, while the welding point protrudes proximally, which could cause the welding point and its release head to be located within the blood vessel, thus obstructing normal blood flow. The proximal face 13 is concave distally, causing the welding point and release head to move into the aneurysm, thereby ensuring that the welding point and release head are completely located within the aneurysm, preventing the welding point and release head from obstructing blood flow within the artery.

[0037] The method of forming a conical surface by the proximal end face 13 being recessed towards the distal end can also be achieved through thermoplastic forming.

[0038] The formation of a conical surface on the proximal end face 13 means that the proximal end face 13 is generally conical or frustum-shaped.

[0039] The distance between point B and the axis of the plug is S1, and the axial distance between point C and point B is S2, where S2:S1 is 1:(6-10).

[0040] In its deployed state, the occluder includes a main body 11 and an anti-dislodgement ring 12 connected to the main body 11. The radius of the main body 11 is S1, and the radial dimension of the anti-dislodgement ring 12 is S2, with a ratio of S2:S1 of 1:(6-10). It is evident that S2 is much smaller than S1. When the occluder is deployed, a compressive force is formed between the occluder and the inner wall of the aneurysm. This compressive force is primarily generated by the main body 11. The force pulling the occluder towards the aneurysm opening during blood flow is relatively small. When the occluder moves outward, the main body... 11 first moves outward (towards the proximal side, also towards the aneurysm opening), causing points A and B of the anti-dislodgement ring 12 to move outward, while point C rests on the inner wall of the aneurysm, so the position of point C remains unchanged. This causes the anti-dislodgement ring 12 to deform, generating an inward elastic force (a force that moves distally, a force that moves towards the bottom of the aneurysm within the aneurysm). This elastic force acts on the main body 11, causing the main body 11 to return to its original position, thereby preventing the occluder from dislodging.

[0041] In an optional embodiment, the plug body 1 is spherical, and the distance between two adjacent anti-dislodgement rings 12 along the axial direction of the plug body 1 is 0. When the aneurysm is spherical, the plug body 1 is also spherical. For the autumn-type occluder, the closer the anti-dislodgement ring 12 is to the distal end, the less likely the distal anti-dislodgement ring 12 can abut against the inner wall of the aneurysm when the body 11 moves outward. Therefore, only the anti-dislodgement ring 12 near the middle of the aneurysm can abut against the inner wall of the aneurysm. This makes the number of anti-dislodgement rings 12 that can play an anti-dislodgement role effective. Setting the distance between two adjacent anti-dislodgement rings 12 to 0 allows for the provision of more anti-dislodgement rings 12, so that the middle (axial middle) of the plug body 1 has more anti-dislodgement rings 12, ensuring the anti-dislodgement capability of the occluder.

[0042] In another optional embodiment, the plug body 1 is columnar, and the distance between adjacent anti-dislodgement rings 12 along the axial direction of the plug body 1 is S4, the distance between point A and point B is S3, and S4:S3 is (8-10):(8-10). When the aneurysm is columnar, the plug body 1 is also columnar, and thus multiple anti-dislodgement rings 12 are provided on the outer peripheral surface of the body 11, and each anti-dislodgement ring 12 can play an anti-dislodgement role. Therefore, the position of the anti-dislodgement rings 12 is no longer limited, and a certain distance can be left between the anti-dislodgement rings 12, which is basically consistent with the radial dimension of the anti-dislodgement rings 12.

[0043] It should be understood that the above embodiments are merely exemplary and not restrictive. Various obvious or equivalent modifications or substitutions that can be made by those skilled in the art regarding the above details without departing from the basic principles of the present invention will be included within the scope of the claims of the present invention.

Claims

1. A sealing device, characterized in that, It includes a plug body woven from multiple shape memory alloy wires, with the welding points of the multiple shape memory alloy wires located at the proximal end of the plug body, and no welding points at the distal end of the plug body. The outer periphery of the plug body is bent to form multiple anti-detachment rings. The cross-section of the anti-detachment ring is triangular, and the three points of the triangle are A, B and C. Points A and B are located radially inside point C. Point A is closer to the distal end of the plug body than point B. In the axial direction of the plug body, point C is located at the same position as point B, or point C is located on the proximal side of point B.

2. The occluder according to claim 1, characterized in that, Multiple anti-detachment rings are arranged at equal intervals along the axial direction of the plug body.

3. The occluder according to claim 1, characterized in that, A release head is connected to the welding point.

4. The occluder according to claim 3, characterized in that, The proximal end of the plug body forms a proximal end face, and the center of the proximal end face is concave towards the distal end, so that the proximal end face forms a conical surface. The welding point is located at the cone point of the conical surface, and the release head is located within the conical space enclosed by the conical surface.

5. The plugging device according to any one of claims 1-4, characterized in that, The distance between point B and the axis of the plug is S1, and the axial distance between point C and point B is S2, where S2:S1 is 1:(6-10).

6. The occluder according to claim 5, characterized in that the distance between point A and point B is S3, and the ratio of S3 to S2 is (8-10):(8-10).

7. The plugging device according to claim 1, characterized in that, The plug body is spherical, and the distance between two adjacent anti-detachment rings along the axial direction of the plug body is 0.

8. The occluder according to claim 1, characterized in that, The plug body is columnar. Along the axial direction of the plug body, the distance between adjacent anti-detachment rings is S4, and the distance between point A and point B is S3. The ratio of S4 to S3 is (8-10):(8-10).

Images