Aneurysm treatment device

Abstract

The present application relates to an aneurysm treatment device for implanting into an aneurysm, comprising: a balloon including a hollow balloon body, the balloon body being inflatable or contractible, the balloon body having an opening, the balloon body being capable of entering into the aneurysm, the balloon body being capable of allowing filling or discharging of contrast agent; and an inflation assembly arranged in the balloon body, the inflation assembly being used for supporting the balloon body and opening or closing the opening, the inflation assembly being capable of sealing the balloon body when the inflation assembly closes the opening; when the balloon body is filled with the contrast agent, the balloon body is inflated and an outer wall thereof is capable of abutting against at least part of an inner wall of the aneurysm; when the balloon body discharges the contrast agent, the balloon body is contracted and a negative pressure effect is capable of reducing the aneurysm. Thus, the size of the aneurysm can be reduced after the operation, and the aneurysm space occupation can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to medical surgical instruments, in particular to an aneurysm treatment instrument. BACKGROUND

[0002] Common vascular diseases include aneurysm, blood vessel rupture, blood vessel perforation, and blood vessel expansion. Aneurysm is a disease caused by the weakening of the local blood vessel wall due to disease, injury or congenital factors. Under the impact of blood flow, the weak point of the aneurysm wall protrudes outward and gradually expands to form a round, oval or prismatic cystic enlargement. Aneurysm is a potentially life-threatening disease. Aneurysm grows under the impact of blood flow, compresses the surrounding organs or tissues, and causes symptoms. Aneurysm rupture due to increased blood pressure or other factors causes acute bleeding. Aneurysm can occur in different parts of the body, the most common being abdominal aortic aneurysm and intracranial aneurysm.

[0003] Intracranial aneurysm is a high-morbidity and high-mortality cerebrovascular disease caused by congenital defects in the local cerebral artery wall and increased intracranial pressure. Aneurysm is often found at the bifurcation of the cerebral artery. When aneurysm ruptures, it shows severe headache, irritability, nausea and vomiting, and intracranial pressure increases. In severe cases, it can be life-threatening. Aneurysm is the main cause of subarachnoid hemorrhage.

[0004] With the improvement of medical technology, the development of instrument materials and the accumulation of experience of neurointerventional physicians, endovascular treatment has become the preferred treatment method for reducing the rebleeding rate and mortality of ruptured aneurysm. Among the many treatment methods, the most widely used are aneurysm coil embolization and blood flow directed device treatment. Coil embolization is to densely embolize the coil into the aneurysm to affect the blood flow in the aneurysm and promote thrombus formation in the aneurysm. Blood flow directed device is to form a blood flow barrier at the aneurysm neck to directly prevent blood from flowing into the aneurysm, and then thrombus gradually forms in the aneurysm to achieve the purpose of treating aneurysm.

[0005] However, the postoperative clinical effect of the above two main treatment methods is that the aneurysm still maintains its original size, and thrombus and organized tissue form in the aneurysm. In the medium and long term after surgery, the aneurysm volume will remain the same size, and there is a clinical space-occupying effect of continuously compressing the nerves, blood vessels and organs outside the aneurysm. SUMMARY

[0006] Therefore, it is necessary to provide an aneurysm treatment instrument capable of reducing the inherent size of the aneurysm after surgery in view of the problem of the aneurysm maintaining a fixed size after surgery.

[0007] An aneurysm treatment instrument for implanting into an aneurysm, the aneurysm treatment instrument comprising:

[0008] a balloon, comprising a hollow balloon body, the balloon body being inflatable or deflatable, the balloon body having an opening, the balloon body being capable of entering the aneurysm, the balloon body being capable of allowing filling or discharging of contrast medium inside the balloon body; and

[0009] an expansion assembly, disposed in the balloon body, the expansion assembly being used for supporting the balloon body and opening or closing the opening, the expansion assembly being capable of sealing the balloon body when the expansion assembly closes the opening;

[0010] when the balloon body is filled with the contrast medium, the balloon body is inflated and an outer wall of the balloon body is capable of abutting against at least part of an inner wall of the aneurysm; when the balloon body is discharged of the contrast medium, the balloon body is deflated and a negative pressure effect is capable of reducing the aneurysm.

[0011] In one of the embodiments, the expansion assembly comprises an expansion stent and a closure stent, the expansion stent being capable of being deflated or inflated, the expansion stent being in contact with the balloon body, the expansion stent being capable of driving the balloon body to inflate or the contrast medium being capable of filling the balloon body to inflate the balloon body when the expansion stent is inflated, the opening of the balloon body being exposed, the closure stent being at least partially connected to the expansion stent and being capable of opening or closing the opening, the closure stent being capable of sealing the balloon body when the closure stent closes the opening.

[0012] In one of the embodiments, the expansion stent is disposed inside the balloon body, the expansion stent being in abutment with an inner surface of the balloon body.

[0013] In one of the embodiments, the expansion stent is disposed outside the balloon body, the expansion stent being in contact with an outer surface of the balloon body.

[0014] In one of the embodiments, the expansion stent comprises a first end and a second end, the first end and the second end being respectively located at two ends of the expansion stent, a radial dimension of the first end being greater than a radial dimension of the second end, the expansion stent being in a flared structure after being inflated, the second end being in contact with an edge of the opening of the balloon body.

[0015] In one of the embodiments, the expansion stent is in abutment with the balloon body when the expansion stent is inflated.

[0016] In one of the embodiments, the expansion stent is in abutment with only part of the balloon body.

[0017] In one of the embodiments, the expansion stent is a mesh structure formed by crossing a plurality of braided wires.

[0018] Alternatively, the expansion stent is cut from a metal tube having self-expansion property.

[0019] In one of the embodiments, the shape of each of the braided wires is linear, curved, or a combination of linear and curved.

[0020] In one of the embodiments, the expandable stent is made of an elastic metal material.

[0021] Alternatively, the expandable stent is made of a non-elastic memory metal, and the contrast agent filled in the balloon makes the balloon expand.

[0022] In one of the embodiments, the expandable stent is made of at least one of the following materials: nickel-titanium alloy, nitinol, stainless steel, cobalt-chromium alloy, nickel-cobalt alloy, and stretch-filled tube.

[0023] In one of the embodiments, the radial dimension of the closed stent is greater than the radial dimension of the opening.

[0024] In one of the embodiments, the opening is circular.

[0025] The closed stent is circular, or the closed stent has an inscribed circle.

[0026] The diameter of the closed stent is 1.2-1.5 times the diameter of the opening.

[0027] In one of the embodiments, the closed stent is formed by braiding a plurality of braided wires, or the closed stent is formed by laser engraving.

[0028] In one of the embodiments, the balloon further comprises a covering film covering the closed stent, and the covering film seals the opening when the closed stent closes the opening.

[0029] In one of the embodiments, the balloon is a dense water-tight structure.

[0030] In one of the embodiments, the balloon is made of a non-degradable polymer material.

[0031] In one of the embodiments, the balloon is made of polytetrafluoroethylene, polyurethane, or polyethylene.

[0032] In one of the embodiments, the aneurysm treatment device further comprises a catheter for filling the contrast agent into the balloon.

[0033] The catheter remains in the state of extending into the opening before the balloon expands.

[0034] After the above technical solution is adopted, the present application has at least the following technical effects:

[0035] The aneurysm treatment instrument of the present application is used to extend a catheter into the interior of the capsule through the opening, place the entire aneurysm treatment instrument and the catheter extending into the interior of the capsule into a delivery tube, deliver the aneurysm treatment instrument into the aneurysm through the delivery tube, and enable the expansion assembly to support the capsule. Subsequently, contrast agent can be injected into the capsule through the catheter, and the capsule gradually expands in the process to continuously squeeze blood out of the aneurysm; when the capsule touches the inner wall of the aneurysm, continue to fill the capsule with contrast agent until the shape of the capsule is consistent with the shape of the aneurysm cavity, so that there is substantially no blood in the aneurysm cavity; then, the contrast agent in the capsule is pumped out through the catheter, and the negative pressure generated between the capsule and the aneurysm in the process of the contrast agent being pumped out of the capsule can drive the aneurysm to shrink; when the capsule and the aneurysm are attached to the expansion assembly, the catheter is extracted, and the opening is closed by the expansion assembly to avoid blood flowing back into the aneurysm. The aneurysm treatment instrument of the present application supports the capsule by the expansion assembly, and enables the capsule to expand and contract by injecting or pumping contrast agent into the capsule, so that the negative pressure generated when the capsule shrinks during pumping drives the aneurysm to shrink, thereby reducing the size of the aneurysm after the operation and reducing the space-occupying effect of the aneurysm. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 A perspective view of an aneurysm treatment instrument according to an embodiment of the present application;

[0037] Figure 2 A front view of the aneurysm treatment instrument shown in Figure 1

[0038] A side view of the aneurysm treatment instrument shown in Figure 3 Figure 1 A perspective view of the aneurysm treatment instrument and the catheter cooperating from one angle shown in

[0039] Figure 4 Figure 1 A perspective view of the aneurysm treatment instrument and the catheter cooperating from another angle shown in

[0040] Figure 5 A perspective view of the closing of the closing bracket in the expansion assembly of the aneurysm treatment instrument shown in Figure 4

[0041] A front view of the closing of the closing bracket in the collision assembly shown in Figure 6

[0042] A bottom view of the closing of the closing bracket in the expansion assembly shown in Figure 7 Figure 6

[0043] Figure 8 Figure 6

[0044] Figure 9 ​​​​​​A three-dimensional view of the opening of the closed stent in the expansion component of the aneurysm treatment device shown in Figure 1;

[0045] Figure 10 for Figure 9 The front view of the closed bracket in the collision assembly shown is shown.

[0046] Figure 11 for Figure 9 A bottom view of the expansion assembly with the closed support open;

[0047] Figure 12 for Figure 9 A side view of the expansion assembly with the closed support open;

[0048] Figure 13 for Figure 1 The diagram shows the process of implanting an aneurysm treatment device into the aneurysm.

[0049] Among them: 100, aneurysm treatment device; 110, balloon; 111, balloon body; 1111, opening; 112, covering membrane; 120, expansion component; 121, expansion stent; 122, closure stent; 200, aneurysm; 210, aneurysm cavity; 300, catheter. Detailed Implementation

[0050] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0051] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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 invention.

[0052] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0055] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0056] See Figures 1 to 5This invention provides an aneurysm treatment device 100. This aneurysm treatment device 100 can be implanted into an aneurysm 200 to reduce the size of the aneurysm 200 after surgery, thus reducing its occupancy. It is understood that the aneurysm 200 can be an intracranial aneurysm, celiac aneurysm, carotid aneurysm, etc. In this invention, the application of the aneurysm treatment device 100 to an intracranial aneurysm 200 is used as an example for explanation. The principle of applying the aneurysm treatment device 100 to aneurysms 200 in other locations is essentially the same as that for intracranial aneurysms 200, and will not be elaborated upon here.

[0057] Understandably, current treatments for aneurysms typically involve either causing a thrombus to form within the aneurysm or draining the blood from the aneurysm to achieve the goal of treatment. However, after either of these methods, the aneurysm often retains its original size, and its volume may remain unchanged in the mid-term or even long-term postoperative period, exhibiting a space-occupying effect and thus posing safety risks.

[0058] Therefore, the present invention provides a novel aneurysm treatment device 100. After implantation into an aneurysm 200, the aneurysm treatment device 100 expands to drain blood from the aneurysm 200, and contracts to shrink the aneurysm 200, reducing its volume and preventing it from causing a space-occupying effect. The specific structure of the aneurysm treatment device 100 is described in detail below.

[0059] See Figures 1 to 5 In one embodiment, the aneurysm treatment device 100 includes a balloon 110 and an expansion assembly 120. The balloon 110 includes a hollow sac 111, which is inflatable or deflated, and has an opening 1111 that allows it to enter the aneurysm 200. The interior of the sac 111 allows for the filling or drainage of contrast agent. The expansion assembly 120 is disposed on the sac 111 and supports the sac 111, opening or closing the opening 1111. When the opening 1111 is closed, the expansion assembly 120 seals the sac 111. When the sac 111 is filled with contrast agent, it expands and its outer wall abuts against at least a portion of the inner wall of the aneurysm 200; when the sac 111 drains the contrast agent, it contracts and the negative pressure causes the aneurysm 200 to shrink.

[0060] The balloon 110 is the expansion and contraction component of the aneurysm treatment device 100, and it shrinks the aneurysm 200. The balloon 110 includes a balloon body 111, which is a hollow structure with an opening 1111 that connects the internal and external environments of the balloon body 111. In actual use, the catheter 300 is first inserted into the balloon body 111 through the opening 1111. Then, the catheter 300, balloon body 111, and expansion component 120 are placed in a larger delivery tube. The balloon body 111 of the balloon 110 is delivered into the aneurysm 200 through the delivery tube. Afterward, the delivery tube is removed, and contrast agent is injected into and drained from the balloon body 111 through the catheter 300. When the balloon body 111 is inflated by the injection of contrast agent, it is approximately spherical. When the sac 111 adheres to the inner wall of the aneurysm 200, the shape of the sac 111 matches the shape of the aneurysm cavity 210 of the aneurysm 200. In other words, the shape of the expanded sac 111 can adapt to the shape of the aneurysm cavity 210, which facilitates the sac 111 to drive the aneurysm 200 to shrink synchronously.

[0061] An expansion component 120 is disposed within the balloon 111, and the expansion component 120 is capable of expanding or contracting. When the expansion component 120 expands, it can open the balloon 111, exposing the opening 1111 of the balloon 111, facilitating the insertion of the catheter 300 into the balloon 111 through the opening 1111. Furthermore, when the expansion component 120 expands the balloon 111 within the aneurysm 200, it allows the balloon 111 to occupy a certain amount of space, facilitating the filling of the balloon 111 with contrast agent by the catheter 300. It is worth noting that the expansion component 120 can self-inflate without external force, and can contract when external force is applied to it. These expansion and contraction characteristics of the expansion component 120 facilitate the delivery of the expansion component 120 and the balloon 110 to the aneurysm 200 by medical personnel through a delivery tube.

[0062] See Figures 1 to 5 , Figure 13 Specifically, the expansion assembly 120 and the balloon 111 are folded and contracted by external force and placed in the delivery tube. The contracted expansion assembly 120 and the balloon 111 connected to the catheter 300 are then delivered into the aneurysm 200 through the delivery tube. After the expansion assembly 120 and the balloon 111 are detached from the delivery tube, the expansion assembly 120 can self-inflate, at which point contrast agent can be filled into the balloon 111 through the catheter 300.

[0063] When contrast agent is injected into the balloon 111 through the catheter 300, the contrast agent gradually fills the balloon 111, causing it to gradually expand. During this process, the balloon 110 occupies space inside the aneurysm 200, continuously squeezing out blood from the aneurysm cavity 210, so that at least part of the balloon 111 touches the inner wall of the aneurysm 200. Subsequently, contrast agent continues to be filled into the balloon 111, causing its volume to continuously expand, further squeezing out blood from the aneurysm cavity 210. When the shape of the balloon 111 is nearly identical to the shape of the aneurysm cavity 210, the balloon 111 and the expansion component 120 form a wall-adhering barrier, and there is no blood in the aneurysm cavity 210.

[0064] Then, contrast agent is aspirated from the sac 111 through catheter 300. As the contrast agent is continuously aspirated, the volume of the sac 111 continuously shrinks. Because a negative pressure is created between the outer surface of the sac 111 and the inner wall of the aneurysm 200, the shrinking of the sac 111 causes the aneurysm 200 to shrink accordingly. After the catheter 300 has completely aspirated the contrast agent from the sac 111, the negative pressure causes the sac 111 to contract and adhere to the expansion component 120. Simultaneously, the aneurysm 200 also shrinks, causing its inner wall to adhere to the outer wall of the sac 111. Subsequently, the catheter 300 is removed, and the expansion component 120 seals the opening 1111, forming a closure to prevent blood from entering the aneurysm cavity 210.

[0065] The aneurysm treatment device 100 of the present invention includes an expansion component 120 that supports the balloon body 111 of the balloon 110. On one hand, the expansion component 120 expands the balloon body 111, facilitating the insertion of the catheter 300 into the balloon body 111 and subsequent filling with contrast agent. On the other hand, during aspiration of the balloon body 111, the expansion component 120 also supports the balloon body 111 to maintain its shape during aspiration, facilitating synchronous contraction of the aneurysm 200. Furthermore, when contrast agent is injected into the balloon body 111 through the catheter 300, the contrast agent causes the balloon body 111 to gradually expand and come into contact with the inner wall of the aneurysm 200 until the outer surface of the balloon body 111 is completely adhered to the inner wall of the aneurysm 200. Then, the contrast agent is withdrawn from the balloon body 111 through the catheter 300, causing the balloon body 111 to continuously shrink. As the balloon body 111 shrinks, it synchronously shrinks the aneurysm 200. After complete aspiration, the sac 111 can adhere to the expansion component 120, and the aneurysm 200 can adhere to the outer surface of the sac 111, thereby reducing the volume of the aneurysm 200 and thus reducing the space-occupying effect of the aneurysm 200.

[0066] See Figures 1 to 3 , Figures 6 to 12In one embodiment, the expansion assembly 120 includes an expansion support 121 and a closing support 122. The expansion support 121 is capable of contraction or expansion and is in contact with the capsule 111. When the expansion support 121 expands, it can cause the capsule 111 to expand or the contrast agent can be injected into the capsule 111 to expand the capsule 111, exposing the opening 1111 of the capsule 111. The closing support 122 is at least partially connected to the expansion support 121 and opens or closes the opening 1111. When the closing support 122 closes the opening 1111, it can seal the capsule 111.

[0067] The expandable stent 121 serves as a support component for the expandable assembly 120, supporting the cyst 111. Specifically, after the cyst 111 enters the aneurysm 200, the expandable stent 121 expands the cyst 111, allowing it to occupy a certain space within the aneurysm 200, facilitating subsequent filling with contrast agent. After the catheter 300 aspirates the contrast agent from the cyst 111, the expandable stent 121 continues to support the cyst 111 and the aneurysm 200 attached to it, maintaining the original expanded state of the cyst 111 covering the aneurysm neck.

[0068] At least a portion of the closure stent 122 is connected to the expansion stent 121. Without external force, the closure stent 122 can close the opening 1111. When an external force is applied to the closure stent 122, the closure stent 122 can move away from the opening 1111, at which point the opening 1111 is opened. When the external force disappears, the closure stent 122 can reset under the force of its own material to close the opening 1111, ensuring the airtightness of the capsule 111.

[0069] Specifically, before the aneurysm treatment device 100 is implanted into the aneurysm 200, the closure stent 122 is moved via the catheter 300, causing the closure stent 122 to open its opening 1111. At this time, the catheter 300 can pass through the opening 1111 and extend into the interior of the sac 111. After the sac 111 and the expansion component 120 connected to the catheter 300 are delivered into the aneurysm 200 through the delivery tube, the expansion stent 121 can self-inflate, that is, the expansion stent 121 can at least partially extend, thus expanding the sac 111. Subsequently, contrast agent is injected into the sac 111 through the catheter 300. After the contrast agent is aspirated by the catheter 300, the catheter 300 is removed from the sac 111 through the opening 1111. Under the force of its own material, the closure stent 122 can reset to close the opening 1111, preventing blood and other substances from entering the sac 111.

[0070] Of course, in other embodiments of the present invention, the expandable stent 121 may not have expandable properties. In this case, contrast agent is filled into the capsule 111, causing the capsule 111 to expand. The principle of contrast agent filling the capsule 111 to expand the capsule 111 is essentially the same as the principle of self-expansion of the capsule 111 described above, and will not be elaborated here. Optionally, the expandable stent 121 is cut from a non-elastic shape memory metal. By filling the capsule 111 with contrast agent, the capsule 111 expands, thereby driving the expandable stent 121 to expand. In this embodiment, the expandable stent 121 only serves to support the capsule to open at the aneurysm neck to seal the aneurysm neck.

[0071] See Figures 1 to 3 , Figures 6 to 12 In one embodiment, the expandable stent 121 is disposed inside the capsule 111 and located at the bottom of the capsule 111, i.e., at the neck of the tumor, and the expandable stent 121 abuts against the inner surface of the capsule 111. That is, the expandable stent 121 is disposed inside the capsule 111, i.e., the capsule 111 is wrapped around the outside of the expandable stent 121.

[0072] After the aneurysm treatment device 100 is deconstricted and delivered into the aneurysm 200 through the delivery tube, the expansion stent 121 expands inside the sac 111, abutting against the inner wall of the sac 111 to expand the sac 111. Moreover, after the contrast agent in the sac 111 is aspirated, the inner wall of the sac 111 adheres to the expansion stent 121, and the inner wall of the aneurysm 200 adheres to the outer wall of the sac 111.

[0073] Optionally, the expandable stent 121 is at least partially fixed to the inner wall of the capsule 111. Optionally, the expandable stent 121 is located at the bottom of the capsule 111, i.e., at the neck of the aneurysm, and is located around the opening 1111. In this way, after the contrast agent in the capsule 111 is aspirated, the stent at the bottom allows the capsule 111 and the aneurysm 200 to adhere to the stent, so that the capsule 111 can drive the aneurysm 200 to shrink and prevent the aneurysm 200 from occupying space. Optionally, the expandable stent 121 is fixed in the capsule 111 by means of adhesive or other methods. Of course, the expandable stent 121 can also be freely placed in the capsule 111.

[0074] See Figures 1 to 3 , Figures 6 to 12 In one embodiment, the expandable stent 121 is disposed outside the capsule 111 and located at the bottom of the capsule 111, i.e., at the neck of the tumor, and the expandable stent 121 is in contact with the outer surface of the capsule 111. That is, the expandable stent 121 is disposed outside the capsule 111, i.e., the expandable stent 121 at least partially covers the capsule 111.

[0075] After the aneurysm treatment device 100 is deconstricted and delivered into the aneurysm 200 through the delivery tube, the expansion stent 121 expands on the outside of the sac 111. The expansion stent 121 can drive the sac 111 to stretch, causing the sac 111 to partially expand. Moreover, after the contrast agent in the sac 111 is aspirated, the sac 111 is attached to the expansion stent 121 in a double-layer structure, and the inner wall of the aneurysm 200 is attached to the outer wall of the sac 111.

[0076] Optionally, the expandable stent 121 is at least partially fixed to the outer wall of the sac 111. Optionally, the expandable stent 121 is located at the bottom of the sac 111 and around the opening 1111. In this way, after the contrast agent in the sac 111 is aspirated, the expandable stent 121 at the bottom allows the sac 111 and the aneurysm 200 to adhere to the expandable stent 121, enabling the sac 111 to shrink the aneurysm 200 and prevent the aneurysm 200 from occupying space. Optionally, the expandable stent 121 is fixed in the sac 111 by means of adhesive or other methods.

[0077] It is worth noting that the working principle of the expansion support 121 located inside the bladder 111 is essentially the same as that of the expansion support 121 located outside the bladder 111. In this invention, only the example of the expansion support 121 being set on the inner wall of the bladder 111 is used for explanation, and other details will not be repeated.

[0078] See Figures 1 to 3 , Figures 6 to 12 In one embodiment, the expansion stent 121 includes a first end and a second end, the first end and the second end being located at opposite ends of the expansion stent 121, the radial dimension of the first end being greater than the radial dimension of the second end, so that the expanded expansion stent 121 has a flared structure after expansion, and the second end is in contact with the edge of the opening 1111 of the bladder 111.

[0079] The radial dimension of the first end is larger, and the radial dimension of the second end is smaller, resulting in the expanded support 121 having a flared shape after expansion, such as... Figure 6 As shown, the upper radial dimension is larger and the lower radial dimension is smaller. The expansion stent 121 has two opposite ends, namely the first end and the second end. The first end is the flared end and the second end is the narrow end. The expansion stent 121 smoothly connects the first end and the second end, so that the shape of the part of the sac 111 that contacts the expansion stent 121 is consistent, which makes it easy for the sac 111 to adhere to the inner wall of the aneurysm 200.

[0080] The first end of the expandable stent 121 is located in the middle of the balloon 111, and the second end is located at the edge of the opening 1111 of the balloon 111. After the balloon 111 expands, the first end of the expandable stent 121 can partially open the interior of the balloon 111, and the closure stent 122 closes the opening 1111. Thus, when filling the balloon 111 with contrast agent, the closure stent 122 is moved through the catheter 300 to open the opening 1111. The catheter 300 is then inserted into the balloon 111 through the opening 1111. The balloon 111 and the expandable stent 121 are then delivered to the aneurysm 200 through the delivery tube. After the delivery tube is removed, contrast agent can be injected into the balloon 111 through the catheter 300.

[0081] In one embodiment, the longitudinal section and axial shape of the expandable stent 121 are arc-shaped. That is, the expanded stent 121, after expansion, is part of a sphere. This facilitates the fit of the sac 111 to the inner wall of the aneurysm 200.

[0082] See Figures 1 to 3 , Figures 6 to 12 In one embodiment, the expandable stent 121 is a mesh structure formed by multiple interwoven braids. The mesh structure, with its gaps, allows the braids to contract, thus enabling the expandable stent 121 to contract. This allows the expandable stent 121 to contract under external force, facilitating its entry into the delivery tube and subsequent delivery to the aneurysm 200.

[0083] In one embodiment, the shape of each braided filament is a straight line, a curve, or a combination of straight and curved lines. That is, the braided filaments used in the expansion bracket 121 can all be straight. The straight braided filaments can be interlaced horizontally and vertically, or they can be interlaced at an angle. Optionally, the braided filaments of the expansion bracket 121 can all be curved. The protrusions of the curved braided filaments can be arranged in the same direction, or they can be partially oriented in the same direction and partially in another direction, thus interlacing to form the expansion bracket 121. Of course, in other embodiments of the present invention, some of the braided filaments can be curved and some can be straight.

[0084] In this invention, the braided filaments of the expansion bracket 121 are arc-shaped, and the arc-shaped braided filaments are interlaced with the braided filaments facing opposite directions to form a mesh structure.

[0085] In one embodiment, when the expandable stent 121 expands, it adheres to the capsule 111. That is, when the expandable stent 121 expands, it covers the surface of the capsule 111. Of course, in other embodiments of the invention, the expandable stent 121 only adheres to a portion of the capsule 111. That is, after expansion, the expandable stent 121 only covers a portion of the surface of the capsule 111.

[0086] In one embodiment, the expansion support 121 is formed by cutting a self-expanding metal tube. That is, a self-expanding metal tube is cut to form a mesh structure, i.e., to form the expansion support 121, so that the expansion support 121 can contract under the action of external force and self-expand when the external force is removed.

[0087] In one embodiment, the expandable stent 121 is made of an elastic metallic material. This allows the expandable stent 121 to compress and self-expand. Specifically, when an external force is applied to the expandable stent 121, the properties of the elastic metallic material allow the expandable stent 121 to contract. At this time, the expandable stent 121 can enter the delivery tube and be delivered to the aneurysm 200. When the external force on the expandable stent 121 disappears, the properties of the elastic metallic material allow the elastic stent to self-expand, and the expandable stent 121 gradually extends and expands. At this time, the expandable stent 121 can expand the sac 111, causing the sac 111 to expand.

[0088] In one embodiment, the expansion bracket 121 is made of at least one of nickel-titanium alloy, nitinol, stainless steel, cobalt-chromium alloy, nickel-cobalt alloy, and drawn-filled tube (DFT). That is, the elastic metallic material includes at least one of nickel-titanium alloy, nitinol, stainless steel, cobalt-chromium alloy, nickel-cobalt alloy, and drawn-filled tube to ensure that the expansion bracket 121 has self-expanding properties. Of course, in other embodiments of the present invention, the expansion bracket 121 may also be made of other materials with elastic properties.

[0089] See Figures 1 to 3 , Figures 6 to 12 In one embodiment, the radial dimension of the closure stent 122 is larger than the radial dimension of the opening 1111. That is, the closure stent 122 can completely cover the opening 1111, ensuring the airtightness of the sac 111, preventing blood and other substances from entering the sac 111, and ensuring that the shape of the aneurysm 200 remains unchanged after shrinkage.

[0090] See Figures 1 to 3 , Figures 6 to 12In one embodiment, the opening 1111 is circular. The closing support 122 is circular, or the closing support 122 has an inscribed circle. That is, the opening 1111 is circular in shape, and the diameter of the opening 1111 is slightly larger than the diameter of the catheter 300, so that the catheter 300 can pass through the opening 1111 and extend into the capsule 111. The shape of the closing support 122 is not limited in principle, as long as it can close the opening 1111. Optionally, the shape of the closing support 122 can be circular, or it can be a structure that can cover the opening 1111.

[0091] In one embodiment, the diameter of the closing support 122 is 1.2 to 1.5 times the diameter of the opening 1111. That is, the area of ​​the closing support 122 is larger than the area of ​​the opening 1111, which ensures that the closing support 122 can reliably close the opening 1111 and ensure the airtightness of the bladder 111.

[0092] See Figures 1 to 3 , Figures 6 to 12 In one embodiment, the closure stent 122 is a mesh structure formed by multiple strands of braided filaments. The multiple braided filaments are interwoven to form the mesh structure, and the gaps in the mesh structure can accommodate the contraction of the braided filaments, thereby enabling the closure stent 122 to contract. In this way, the closure stent 122 can contract under external force, facilitating its entry into the delivery tube and subsequent delivery to the interior of the aneurysm 200.

[0093] In one embodiment, the shape of each braided filament is a straight line, a curve, or a combination of straight and curved lines. That is, the braided filaments used in the closed support 122 can all be straight. The straight braided filaments can be crisscrossed horizontally and vertically, or they can be crisscrossed at an angle. Optionally, the braided filaments of the closed support 122 can all be curved. The protrusions of the curved braided filaments can be arranged in the same direction, or they can be partially arranged in the same direction and partially in another direction, thus forming the expansion support 121. Of course, in other embodiments of the present invention, some of the braided filaments can be curved and some can be straight.

[0094] In this invention, the braided filaments are straight, and the braided filaments are interwoven to form a dense network structure, which is the closed support 122.

[0095] In one embodiment, the closed support 122 is formed by laser engraving. That is, the closed support 122 is formed by laser processing to create a dense mesh structure.

[0096] In one embodiment, the closure stent 122 is made of an elastic metallic material. This allows the closure stent 122 to compress and self-expand. Specifically, when an external force is applied to the closure stent 122, the properties of the elastic metallic material allow the closure stent 122 to contract, allowing it to enter the delivery tube and be delivered to the aneurysm 200. When the external force on the closure stent 122 disappears, the properties of the elastic metallic material allow the elastic stent to self-expand, gradually extending and expanding, at which point the closure stent 122 can close the opening 1111. Moreover, when the catheter 300 moves the closure stent 122, the closure stent 122 can open the opening 1111 under the action of external force, allowing the catheter 300 to pass through the opening 1111 and extend into the capsule 111. When the catheter 300 is removed, the properties of the elastic metallic material allow the closure stent 122 to automatically reset, closing the opening 1111 and achieving a seal in the capsule 111.

[0097] In one embodiment, the closed stent 122 is made of at least one of nickel-titanium alloy, nitinol, stainless steel, cobalt-chromium alloy, nickel-cobalt alloy, and drawn-filled tube (DFT). That is, the elastic metallic material includes at least one of nickel-titanium alloy, nitinol, stainless steel, cobalt-chromium alloy, nickel-cobalt alloy, and drawn-filled tube (DFT) to ensure that the closed stent 122 has self-expanding properties. Of course, in other embodiments of the present invention, the closed stent 122 may also be made of other materials with elastic properties.

[0098] See Figures 1 to 3 , Figures 6 to 12 In one embodiment, the balloon 110 further includes a covering membrane 112, which covers the closure support 122. When the closure support 122 closes the opening 1111, the covering membrane 112 seals the opening 1111. The covering membrane 112 can cooperate with the balloon body 111 to form a complete balloon 110. The covering membrane 112 can cover the outside or inside of the closure support 122. When the closure support 122 closes the opening 1111, the covering membrane 112 also covers the opening 1111, ensuring the airtightness of the balloon body 111.

[0099] Of course, in other embodiments of the present invention, the opening 1111 can also be sealed simply by using the sealing bracket 122. It is understood that the sealing bracket 122 has a dense mesh structure, and the sealing structure can also close the opening 1111, preventing blood and other substances from entering.

[0100] In one embodiment, the balloon 110 has a dense, water-impermeable structure. This prevents blood from entering the balloon 110, allowing blood to drain only through the space between the balloon 110 and the inner wall of the aneurysm 200. This ensures that when the balloon 110 inflates, it can squeeze the blood out of the aneurysm 200, and at the same time, it can also ensure that when the balloon 110 contracts, it can cause the aneurysm 200 to shrink.

[0101] In one embodiment, the balloon 110 is made of a non-degradable polymer material. This ensures that the shape of the balloon 111 remains in its contracted state, preventing the aneurysm 200 from degrading and returning to its original size, and effectively avoiding the space-occupying effect of the aneurysm 200.

[0102] In one embodiment, the balloon 110 is made of polytetrafluoroethylene, polyurethane, or polyethylene, etc. Of course, in other embodiments of the present invention, the balloon 110 may also be made of other non-degradable polymer materials, as long as blood can be prevented from entering the balloon body 111.

[0103] In one embodiment, the aneurysm treatment device 100 further includes a catheter 300 for filling the sac 111 with a contrast agent; the catheter 300 remains inserted through the opening before the sac 111 inflates. Before the sac 111 inflates, the catheter 300 extends into the sac through the opening, thus allowing the contrast agent to enter the sac 111 through the catheter 300.

[0104] See Figure 13 The aneurysm treatment device 100 of the present invention is used as follows:

[0105] Before the aneurysm treatment device 100 is implanted into the human body, the bottom occluded stent 122 is opened through the catheter 300, and then the catheter 300 enters the interior of the balloon 111 through the opening 1111 of the balloon 111 and the second end of the expandable stent 121. The entire implantable device can be delivered into the aneurysm 200 through a larger delivery tube.

[0106] See Figure 13(a) to (c), the first stage is the balloon 110 inflation stage. In this stage, the aneurysm treatment device 100 is first placed in the aneurysm cavity 210 of the aneurysm 200 near the aneurysm top, and then contrast agent is injected through the catheter 300, causing the balloon 110 to continuously inflate. As the membrane balloon 110 continues to expand, the blood inside the aneurysm cavity 210 is continuously squeezed out. After the balloon 110 contacts the wall of the aneurysm 200, the shape of the membrane of the balloon 110 matches the shape of the aneurysm cavity 210, and the injection of contrast agent continues to inflate the balloon 110. Under the assisted observation of the imaging equipment, as the volume of the balloon 110 inside the aneurysm cavity 210 continues to expand, the aneurysm treatment device 100 is slowly moved downward, so that as blood is continuously squeezed out of the aneurysm cavity 210, the inflating balloon 110 gradually becomes almost identical to the shape of the aneurysm cavity 210. At this time, the expansion stent 121 is completely released, and the balloon 110 and the expansion stent 121 form a wall-attached barrier, and there is no blood in the aneurysm cavity 210.

[0107] See Figure 13 (d) to (f), the second stage is the aspiration stage. The contrast agent in balloon 110 is aspirated through catheter 300. As the contrast agent is continuously aspirated, the volume of balloon 110 continuously shrinks. During the shrinkage of balloon 110, a negative pressure is formed between the outer surface of balloon 111 and the inner wall of aneurysm 210, causing aneurysm 200 to shrink accordingly. When catheter 300 has completely aspirated the contrast agent inside balloon 110, balloon 110 contracts and adheres to the inner surface of the variable-diameter stent, while aneurysm 200 also shrinks until the inner wall of the aneurysm adheres to the outer surface of balloon 111.

[0108] See Figure 13 (e) The third stage is the release stage. After the second stage is completed, the catheter 300 is withdrawn, and then the stent 122 is closed to prevent the rebound of blood flow in the aneurysm artery. The stent 122 is then fitted to block the opening 1111 of the sac 111. At this time, the volume of the aneurysm 200 is reduced, which can prevent the aneurysm 200 from occupying space and reduce safety risks.

[0109] The aneurysm treatment device 100 of the present invention supports a sac 111 via an expansion stent 121. When contrast agent is injected into the sac 111, it causes the sac 111 to expand, thereby draining the blood from the aneurysm cavity 210, until the expanded sac 111 nearly matches the shape of the aneurysm cavity 210. Then, the contrast agent in the sac 111 is drained. During the shrinking process of the sac 111, the aneurysm 200 shrinks synchronously, thereby reducing the volume of the aneurysm 200 and effectively reducing its space-occupying effect.

[0110] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0111] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An aneurysm treatment device, characterized in that, The aneurysm treatment device is for implantation within an aneurysm and includes: A balloon, comprising a hollow sac, the sac being inflatable or deflated, the sac having an opening, the sac being capable of entering the aneurysm, and the interior of the sac being capable of filling or draining contrast agent; and An expansion component is disposed in the bladder, the expansion component being used to support the bladder and open or close the opening, the expansion component being able to seal the bladder when the opening is closed; When the cyst is filled with contrast agent, the cyst expands and its outer wall can abut against at least a portion of the inner wall of the aneurysm; when the cyst discharges the contrast agent, the cyst contracts and the negative pressure can shrink the aneurysm. The expansion assembly includes an expansion support and a closure support. The expansion support is capable of contracting or expanding and is in contact with the capsule. When the expansion support expands, it can cause the capsule to expand or the contrast agent to be injected into the capsule, causing the capsule to expand and exposing the opening of the capsule. The closure support is at least partially connected to the expansion support and opens or closes the opening. When the closure support opens the opening, it can inject contrast agent into the capsule. When the closure support closes the opening, it can seal the capsule.

2. The aneurysm treatment device according to claim 1, characterized in that, The expansion support is disposed inside the bladder and abuts against the inner surface of the bladder.

3. The aneurysm treatment device according to claim 1, characterized in that, The expansion support is disposed on the outside of the bladder and is in contact with the outer surface of the bladder.

4. The aneurysm treatment device according to claim 1, characterized in that, The expansion stent includes a first end and a second end, which are located at opposite ends of the expansion stent. The radial dimension of the first end is greater than that of the second end, so that the expanded stent has a flared structure after expansion. The second end is in contact with the edge of the opening of the bladder.

5. The aneurysm treatment device according to claim 1, characterized in that, When the expandable stent expands, it fits into the bladder.

6. The aneurysm treatment device according to claim 5, characterized in that, The expandable stent only fits a portion of the cyst.

7. The aneurysm treatment device according to claim 1, characterized in that, The expansion support is a mesh structure formed by multiple interwoven filaments; Alternatively, the expansion support may be formed by cutting a self-expanding metal tube.

8. The aneurysm treatment device according to claim 7, characterized in that, The shape of each braided thread is a straight line, a curve, or a combination of straight lines and curves.

9. The aneurysm treatment device according to claim 1, characterized in that, The expansion bracket is made of elastic metal material; Alternatively, the expansion stent may be made of non-elastic shape memory metal, and the contrast agent filled into the capsule may cause the capsule to expand.

10. The aneurysm treatment device according to claim 9, characterized in that, The expansion support is made of at least one of nickel-titanium alloy, nickel-titanium alloy, stainless steel, cobalt-chromium alloy, nickel-cobalt alloy, and stretch filler tube.

11. The aneurysm treatment device according to any one of claims 2 to 10, characterized in that, The radial dimension of the closed support is larger than the radial dimension of the opening.

12. The aneurysm treatment device according to claim 11, characterized in that, The opening is circular; The closed bracket is circular, or the closed bracket has an inscribed circle; The diameter of the closed support is 1.2 to 1.5 times the diameter of the opening.

13. The aneurysm treatment device according to any one of claims 2 to 10, characterized in that, The closed support is formed by weaving multiple strands of filament; or, the closed support is formed by laser engraving.

14. The aneurysm treatment device according to any one of claims 2 to 10, characterized in that, The balloon also includes a covering membrane that covers the closure support, and the covering membrane seals the opening when the closure support closes the opening.

15. The aneurysm treatment device according to any one of claims 1 to 10, characterized in that, The balloon has a dense, water-impermeable structure.

16. The aneurysm treatment device according to any one of claims 1 to 10, characterized in that, The balloon is made of a non-degradable polymer material.

17. The aneurysm treatment device according to claim 16, characterized in that, The balloon is made of polytetrafluoroethylene, polyurethane, or polyethylene.

18. The aneurysm treatment device according to any one of claims 1 to 10, characterized in that, It also includes a catheter for filling the capsule with contrast agent; Before the cyst expands, the catheter remains inserted through the opening.

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