Vascular structure stenosis treatment assembly

Abstract

The invention belongs to the technical field of interventional medical instruments, and particularly relates to a vascular structure stenosis treatment assembly. The treatment assembly comprises a cutting support, an in-vivo collection device, a balloon catheter and an in-vitro protection branch, the cutting support and the in-vivo collection device are arranged in the balloon catheter in a sliding and penetrating mode, the cutting support and the in-vivo collection device can stretch out of the balloon catheter and be released to be in an unfolded state, and the in-vivo collection device and the cutting support are made of memory metal materials; the cutting support is located at the near end of the in-vivo collecting device and located at the far end of the atheromatous plaque or thrombus. An inlet of the in-vitro protection branch is communicated with the vessel type structure, an outlet is communicated with the vein, and the communication position of the inlet and the vessel type structure is located at the far end of the in-vivo collection device. An appropriate space is created through the balloon catheter, substances such as atheromatous plaques or thrombus are cut through the cutting support, the cut substances are doubly collected through the in-vivo collection device and the in-vitro protection branch, and the device has the advantages of being small in trauma, rapid in recovery and obvious in curative effect.

Description

Technical Field

[0001] The present application belongs to the technical field of interventional medical devices, and specifically relates to a component for treating vascular stenosis. Background Art

[0002] In modern medicine, stenosis of vascular structures such as arteries and veins is a common vascular disease that poses a serious threat to human health. For example, the carotid artery, a vital pathway for blood supply to the brain, can significantly impact blood flow to the brain, increasing the risk of serious cerebrovascular events such as ischemic stroke and transient ischemic attack. Vascular structures such as arteries and veins in other parts of the body also support various blood supply systems or organs. Stenosis or occlusion inevitably leads to dysfunction or loss of these systems and organs.

[0003] Currently, treatments for stenosis of vascular structures such as arteries and veins primarily include stent placement and endarterectomy. Stent placement is a relatively minimally invasive interventional treatment method that involves implanting a stent in a narrowed artery or vein to open the blood vessel and restore normal blood flow. It offers the advantages of less trauma and relatively rapid recovery. However, stent implantation also has limitations, such as the risk of in-stent restenosis, which may require further intervention. Furthermore, the long-term effects of stents and chronic irritation to the blood vessel wall require further attention.

[0004] Endarterectomy of vascular structures such as arteries and veins involves directly removing atherosclerotic plaques or thrombi from the endothelium by incising these structures, thereby restoring the normal diameter and blood flow of the blood vessels. This method has a clear therapeutic effect in relieving stenosis in vascular structures such as arteries and veins, and can achieve good therapeutic effects in some severe cases suitable for surgery. However, this treatment method also has obvious drawbacks. On the one hand, since vascular structures such as arteries and veins need to be incised, the surgical trauma is relatively large, the patient's recovery time is longer, and complications such as wound infection and bleeding may occur, which have a certain impact on the patient's physical condition and quality of life after surgery.

[0005] On the other hand, what is more critical is that after the atherosclerotic thrombus is removed through endarterectomy, if the detached atherosclerotic thrombus cannot be effectively intercepted and removed, it will enter other blood vessels with the blood flow and cause other complications. Taking carotid artery stenosis as an example, when the carotid artery undergoes carotid endarterectomy, if the detached atherosclerotic thrombus is not effectively intercepted and removed, it can easily enter the cerebral blood vessels with the blood flow, forming cerebral thrombosis, leading to serious complications such as cerebral infarction, and posing a great risk of life and disability to patients. Although some measures have been taken clinically to prevent thrombus detachment, the effectiveness of these methods is still unsatisfactory and cannot completely prevent thrombus from entering the cerebral blood vessels. Some of the stripping surgeries in other parts of the large arteries are difficult to reach directly, and some also have the risk of plaque detachment aggravating ischemia.

[0006] With the increasing aging of the population and the improvement of people's demand for healthy quality of life, there is an urgent need for a safer and more effective method or technology to treat stenosis of vascular structures such as arteries and veins, so as to overcome the shortcomings of existing treatment methods, reduce the risk of surgical trauma and complications, and improve patients' treatment effects and quality of life. Summary of the Invention

[0007] The purpose of this application is to provide a safe and effective treatment component for stenosis of vascular structures such as arteries and veins, so as to overcome the shortcomings of existing treatment methods, reduce the risk of surgical trauma and complications, and improve the treatment effect and quality of life of patients.

[0008] The embodiments of the present application can be implemented through the following technical solutions:

[0009] A vascular stenosis treatment assembly includes a cutting stent, an in vivo collection device, a balloon catheter, and an in vitro protective branch. The cutting stent and the in vivo collection device are slidably disposed within the balloon catheter. The cutting stent and the in vivo collection device can be extended from the balloon catheter and released to an expanded state. The in vivo collection device and the cutting stent are made of a memory metal material.

[0010] The cutting stent is located at the proximal end of the in vivo collection device, and the cutting stent is located at the distal end of the atherosclerotic plaque or thrombus;

[0011] The inlet of the extracorporeal protection branch is communicated with a vascular structure, and the outlet is communicated with a normal proximal thick vein, and the communication position between the inlet and the vascular structure is located at the distal end of the in vivo collection device.

[0012] Preferably, the in vivo collection device is connected to the distal end of the cutting stent, and the in vivo collection device and the cutting stent move synchronously.

[0013] Preferably, when the in vivo collection device is in the expanded state, it is a mesh structure, and its outer diameter gradually increases in a direction away from the cutting stent.

[0014] Preferably, the mesh of the in vivo collection device is a polygonal structure.

[0015] Furthermore, the inlet and outlet of the extracorporeal protection branch are connected via a catheter, and a flow control device is provided on the catheter.

[0016] Preferably, a filtering device is further provided between the flow control device and the outlet of the extracorporeal protection branch.

[0017] Furthermore, the opening degree of the flow control device is determined based on a basal value of cerebral blood flow.

[0018] Furthermore, the balloon catheter includes a first catheter, a second catheter and a balloon, the balloon is connected to the distal end of the first catheter, the second catheter is slidably inserted into the first catheter, and the cutting stent and the in vivo collection device are slidably inserted into the second catheter.

[0019] Furthermore, when the cutting stent is in the expanded state, it is a mesh structure with polygonal meshes, the proximal end of which is connected to the delivery guide wire through a first fixing structure, and the distal end is connected to the in vivo collection device through a second fixing structure.

[0020] The embodiment of the present application provides a vascular stenosis treatment assembly having at least the following beneficial effects:

[0021] This application uses a balloon catheter to create a suitable space and a cutting stent to cut away atherosclerotic plaques or thrombi, achieving significant efficacy. The cut material is then collected via both an in-vivo collection device and an extracorporeal protective branch, reducing the risk of surgical trauma and complications. The vascular stenosis treatment component of this application effectively removes and collects foreign matter from vascular structures such as arteries and veins through an interventional approach, offering the advantages of minimal trauma, rapid recovery, and significant efficacy.

[0022] The peripheral curved surface of the in vivo collection device in the present application forms a slope-like structure, and the slope is arranged toward the proximal end. This slope structure can not only realize the hierarchical capture and collection of debris at various positions, but also enables the in vivo collection device to adapt, fit and adhere tightly to vascular structures such as arteries and veins of different inner diameters. Regardless of the inner diameter of vascular structures such as arteries and veins, the in vivo collection device can fit tightly, reducing the possibility of debris escaping due to loose fitting. At the same time, the tight fit further ensures the collection and capture effect of debris, and minimizes the probability of debris escape, thereby providing a more reliable guarantee for the treatment of stenosis of vascular structures such as arteries and veins, and effectively reducing the occurrence of adverse conditions such as debris entering cerebral blood vessels;

[0023] The extracorporeal protective branch in this application precisely regulates blood flow through a flow control device, allowing small particles to flow through the catheter at an appropriate flow rate. On this basis, the setting of the filter device further plays a role, which can carefully filter the blood after passing through the flow control device and collect the small particles again. This design effectively prevents small particles from flowing into the veins with the blood, thereby avoiding the formation of venous thrombosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the connection between the vascular structure stenosis treatment component and the relevant blood vessels in this application;

[0025] Figure 2 This is an overall structural diagram of the connection between the delivery guide wire, cutting stent and in vivo collection device in this application;

[0026] Figure 3 This is the overall structural diagram of the balloon catheter in this application.

[0027] Figure numerals: 1. Cutting stent, 2. In-body collection device, 3. Balloon catheter, 31. First catheter, 32. Second catheter, 33. Balloon, 4. In-body protection branch, 41. Flow control device, 42. Filtering device, 5. First fixing structure, 6. Second fixing structure, 7. Delivery guidewire, A. Vascular structures such as arteries and veins, B. Proximal large vein. DETAILED DESCRIPTION

[0028] Hereinafter, the present application will be further described based on preferred embodiments with reference to the accompanying drawings.

[0029] The terms used in this specification are intended to illustrate the embodiments of this application and are not intended to limit this application. Unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will have a clear understanding of the specific meanings of the above terms in this application.

[0030] In addition, in the description of the embodiments of the present application, various components on the drawings are enlarged or reduced in size for ease of understanding, but this practice is not intended to limit the scope of protection of the present application.

[0031] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of this application are further described below with reference to the accompanying drawings and through specific embodiments. For ease of description, the following description uses the terms "proximal" and "distal," where "proximal" refers to the end closest to the operator, and "distal" refers to the end farther from the operator, extending into vascular structures such as arteries and veins.

[0032] The present application provides a vascular structure stenosis treatment component, Figure 1 A schematic diagram showing the connection between the vascular stenosis treatment component (hereinafter referred to as the treatment component) and the relevant blood vessels in this application is shown. Figure 1 As shown, the treatment component includes a cutting stent 1, an in vivo collection device 2, a balloon catheter 3 and an in vitro protective branch 4. Among them, the balloon catheter 3 is used to transport the in vivo collection device 2 and the cutting stent 1 and to achieve expansion of the narrowed blood vessels, creating a suitable space for the subsequent placement of the in vivo collection device 2 and the cutting stent 1; the cutting stent 1 is used to achieve the cutting of materials such as atherosclerotic plaques or thrombi, so that materials such as atherosclerotic plaques or thrombi are turned into smaller particles that can flow with the blood; the in vivo collection device 2 is used to collect the small particles cut by the cutting stent 1; the in vitro protective branch 4 is used to further collect and capture the small particles that the in vivo collection device 2 has not successfully captured and collected, further reducing the probability of small particles entering the cerebral blood vessels. The present application creates a suitable space through the balloon catheter 3, cuts atherosclerotic plaques or thrombi through the cutting stent 1, and has a significant and effective therapeutic effect. The in vivo collection device 2 and the in vitro protective branch 4 are used to double collect the cut materials, reducing the risk of surgical trauma and complications. The treatment component of the present application achieves effective removal and collection of foreign bodies in vascular structures such as arteries and veins through interventional means, with the advantages of less trauma, faster recovery and significant therapeutic effect.

[0033] The following will describe in detail the coordination relationship among the cutting stent 1 , the in vivo collection device 2 and the balloon catheter 3 and their respective structures.

[0034] Specifically, the cutting stent 1 and the in vivo collection device 2 are slidably arranged in the balloon catheter 3, and the cutting stent 1 and the in vivo collection device 2 can be extended from the balloon catheter 3 and released to the expanded state. That is, the cutting stent 1 and the in vivo collection device 2 have a contracted state and an expanded state respectively. When the cutting stent 1 and the in vivo collection device 2 are placed in the balloon catheter 3, the cutting stent 1 and the in vivo collection device 2 are in the contracted state. When the cutting stent 1 and the in vivo collection device 2 are displaced along the axial direction of the cutting stent 1 and the in vivo collection device 2 in the balloon catheter 3 and extend out of the balloon catheter 3, the cutting stent 1 and the in vivo collection device 2 can be switched from the contracted state to the expanded state. Similarly, when the operation is completed, the cutting stent 1 and the in vivo collection device 2 can be displaced along the axial direction of the cutting stent 1 and re-entered into the balloon catheter 3, and the cutting stent 1 and the in vivo collection device 2 are switched from the expanded state to the contracted state to facilitate withdrawal from the body with the balloon catheter 3.

[0035] Furthermore, balloon catheter 3 comprises a first catheter 31, a second catheter 32, and a balloon 33. Balloon 33 is connected to the distal end of first catheter 31 and is a key component of balloon catheter 3 for achieving its vasodilation function. The outer wall of first catheter 31 is provided with a first chamber that communicates with balloon 33. By manipulating this first chamber, balloon 33 can be switched between expanded and contracted states. When dilating a narrowed vessel, a specific medium is delivered to the first chamber, causing balloon 33 to inflate and thus open the vessel. When dilation is not required, balloon 33 can be deflated to facilitate operation and minimize impact on the vessel.

[0036] In some specific embodiments of the present application, Figure 1 and Figure 3 As shown, the proximal outer wall of the balloon catheter 3 is provided with a tee, the side branch of the tee is connected to the first chamber, and the operator can use a syringe to inject or extract air into the side branch of the tee to switch the expansion and contraction states of the balloon 33.

[0037] Furthermore, the second catheter 32 is slidably disposed within the first catheter 31. Throughout the treatment process, the second catheter 32 serves as a delivery mechanism, with the cutting stent 1 and the in-vivo collection device 2 slidably disposed within the second catheter 32. By operating the second catheter 32, the cutting stent 1 and the in-vivo collection device 2 can be accurately delivered to the target location within the blood vessel, and at the target location, the cutting stent 1 and the in-vivo collection device 2 can be switched from a contracted state to an expanded state. This structural design enables the balloon catheter 3 to not only dilate the blood vessels but also provide a channel for the delivery of the cutting stent 1 and the in-vivo collection device 2. The coordinated operation of these components enhances the effectiveness and safety of the treatment.

[0038] Thus, the operator can control the position of the in vivo collection device 2 and the cutting stent 1 relative to the balloon catheter 3 through the delivery guide wire 7, thereby switching the state of the in vivo collection device 2 and the cutting stent 1 and adjusting the position.

[0039] Furthermore, the cutting stent 1 and the in vivo collecting device 2 are made of memory metal material, so that they can automatically switch from a contracted state to an expanded state when extended from the balloon catheter 3 .

[0040] Further, if Figure 1 As shown, the cutting stent 1 is located at the proximal end of the in-vivo collection device 2, and the cutting stent 1 is located at the distal end of the atherosclerotic plaque or thrombus. During the treatment operation, the operator can use the delivery guide wire 7 to allow the cutting stent 1 to reciprocate multiple times between the distal and proximal ends of the atherosclerotic plaque or thrombus. In this process, the cutting stent 1, by virtue of its own structure and movement mode, effectively and thoroughly cuts materials such as atherosclerotic plaques or thrombi, breaking them down into small particles. At the same time, due to the positional relationship between the in-vivo collection device 2 and the cutting stent 1, at the moment when the cutting stent 1 performs the cutting action, the in-vivo collection device 2 can promptly capture and collect the small particles generated after cutting, and collect most of the debris in situ.

[0041] In some preferred embodiments of the present application, Figure 1 and Figure 2 As shown, the in vivo collection device 2 is connected to the distal end of the cutting stent 1, and the in vivo collection device 2 and the cutting stent 1 move synchronously. This connection method enables the in vivo collection device 2 to achieve synchronous movement with the cutting stent 1. During the actual treatment operation, the cutting stent 1 cuts materials such as atherosclerotic plaques or thrombi, turning them into debris. The in vivo collection device 2 moves synchronously with the cutting stent 1, tracking the position of the cutting stent 1 in real time. Compared with a fixed collection device, this dynamic in vivo collection device 2 can collect the debris generated by the cutting stent 1 more promptly and efficiently. Because it can always maintain a close distance to the cutting site and collect the generated debris in time, the efficiency of collecting debris is greatly improved, thereby better ensuring the smooth progress of the treatment process and reducing the risk of debris entering the cerebral blood vessels.

[0042] In some specific embodiments of the present application, Figure 1 and Figure 2 As shown, when the cutting stent 1 is in the deployed state, it has a mesh structure with polygonal meshes to achieve effective and efficient cutting of materials such as atherosclerotic plaques or thrombi. Its proximal end is connected to the delivery guidewire 7 via a first fixing structure 5, and its distal end is connected to the in-vivo collection device 2 via a second fixing structure 6. The cutting stent 1 is stably connected to the delivery guidewire 7 and the in-vivo collection device 2 via the first fixing structure 5 and the second fixing structure 6, respectively.

[0043] In some preferred embodiments of the present application, Figure 1 and Figure 2As shown, when the in vivo collection device 2 is in the expanded state, it is a mesh structure, and its outer diameter gradually increases in the direction away from the cutting stent 1. Such a structural design brings many advantages.

[0044] First, the peripheral curved surface of the in vivo collection device 2 forms a slope-like structure, and the slope is set toward the proximal end. This slope structure can achieve hierarchical capture and collection of debris at various positions. In the actual treatment process, the debris cut by the cutting stent 1 from materials such as atherosclerotic plaques or thrombi will be dispersed in the blood vessels. The slope-like structure of the in vivo collection device 2 can capture the debris from different levels according to the different positions and movement trajectories of the debris, greatly improving the efficiency of capturing the debris and collecting as much debris generated by cutting as possible.

[0045] Secondly, this type of slope structure enables the in-vivo collection device 2 to adapt to, fit and adhere to vascular structures A such as arteries and veins of different inner diameters. Since there are individual differences in the inner diameters of vascular structures A such as arteries and veins in the human body, this characteristic of the in-vivo collection device 2 ensures the stability of the active connection between it and vascular structures A such as arteries and veins. Regardless of the inner diameter of vascular structures A such as arteries and veins, the in-vivo collection device 2 can fit tightly, reducing the possibility of debris escaping due to loose fit. At the same time, the tight fit further ensures the collection and capture effect of debris, minimizing the probability of debris escape, thereby providing more reliable protection for the treatment of stenosis of vascular structures such as arteries and veins, and effectively reducing the occurrence of adverse conditions such as debris entering the cerebral blood vessels.

[0046] In some preferred embodiments of the present application, Figure 1 and Figure 2 As shown, when the in vivo collection device 2 is in the expanded state, the inner and outer diameters of a certain length near the distal end are basically consistent, so that the in vivo collection device 2 is in a surface contact state with the vascular structure. Compared with line contact, it has the advantages of stable movable connection and tight fit, and further reduces the possibility of debris escape due to loose fit.

[0047] In some preferred embodiments of the present application, the mesh of the in vivo collection device 2 is a polygonal structure, including but not limited to triangular, quadrilateral, pentagonal, and hexagonal structures, so as to achieve effective capture of debris.

[0048] The structure of the extracorporeal protection branch 4 will be described in detail below.

[0049] Specifically, if Figure 1As shown, the inlet of the extracorporeal protective branch 4 is connected to vascular structures A, such as arteries and veins, and the outlet is connected to the proximal large vein B. The connection point between the inlet and vascular structures A, such as arteries and veins, is located at the distal end of the in vivo collection device 2. This connection arrangement establishes an extracorporeal pathway from vascular structures A, such as arteries and veins, to the proximal large vein B.

[0050] During the treatment process, although the in vivo collection device 2 can collect most of the small particles produced by the cutting stent 1, some small particles may not be successfully captured. At this time, the extracorporeal protection branch 4 plays a key role. By utilizing the pressure difference between the vascular structures A such as arteries and veins and the proximal thick veins B, the blood in the extracorporeal protection branch 4 will naturally flow from the vascular structures A such as arteries and veins to the proximal thick veins B, without the need for an extracorporeal pump to pressurize the blood to promote blood flow. This design allows small particles that are not captured by the in vivo collection device 2 to be further collected and captured as the blood passes through the extracorporeal protection branch 4, thereby reducing the risk of small particles entering the cerebral blood vessels and improving the safety and effectiveness of the treatment. The extracorporeal protection branch 4 and the in vivo collection device 2 cooperate with each other to form a double guarantee, minimizing the potential threat of small particles produced by cutting to the cerebral blood vessels, and providing a more complete solution for the treatment of carotid artery or vertebral artery stenosis.

[0051] Specifically, if Figure 1 As shown, the inlet and outlet of the extracorporeal protection branch 4 are interconnected by a catheter, which creates a dedicated channel for blood flow. This channel provides a specific transmission path for small particles that are not successfully captured by the in vivo collection device 2, allowing them to be guided out of the body along with the blood flow.

[0052] At the same time, a flow control device 41 is provided on the catheter, and through the flow control device 41, the flow of blood in the catheter can be accurately controlled according to the actual needs of treatment. During the treatment process, the appropriate blood flow helps to more effectively collect those residual small particles, which not only ensures the collection efficiency, but also avoids the adverse effects that may be caused by excessive or insufficient flow. For example, when the flow is too large, it may cause additional pressure on the blood vessel wall; and when the flow is too small, it may not be able to fully collect small particles. The presence of the flow control device 41 enables the extracorporeal protection branch 4 to better adapt to the physiological conditions and treatment requirements of different patients, further improves the safety and effectiveness of the treatment, and provides more reliable protection for the treatment of stenosis of vascular structures such as arteries and veins.

[0053] In some specific embodiments of the present application, the opening degree of the flow control device 41 is determined based on the basal value of cerebral blood flow.

[0054] In some preferred embodiments of the present application, Figure 1 As described above, a filtering device 42 is further provided between the flow control device 41 and the outlet of the extracorporeal protection branch 4 to better collect small particles and ensure the safety of treatment.

[0055] The extracorporeal protection branch 4 itself is responsible for collecting small particles that are not successfully captured by the in-vivo collection device 2, while the flow control device 41 precisely regulates the blood flow so that small particles can flow in the catheter at a suitable flow rate. On this basis, the setting of the filter device 42 further plays a role. It can carefully filter the blood after passing through the flow control device 41 and collect the small particles therein again. This design effectively prevents small particles from flowing into the proximal thick vein B with the blood, thereby avoiding the formation of thrombus in the proximal thick vein B. Because once small particles flow into the proximal thick vein B, they may accumulate in the proximal thick vein B, increasing the risk of thrombosis, and the filter device 42 ensures the safety of the venous system, provides a stronger guarantee for the patient's recovery, and further improves the effectiveness and safety of the entire vascular structure stenosis treatment component.

[0056] In some preferred embodiments of the present application, the catheter of the extracorporeal protection branch 4 is connected to the vascular structure A and the proximal thick vein B through a Y-shaped puncture needle, respectively, which has the advantages of less trauma and easy operation.

[0057] The vascular structure stenosis treatment component achieves precise removal and collection of foreign bodies in blood vessels through interventional methods. The treatment process and mechanism are as follows: first, a balloon catheter 3 is used to deliver an in-vivo collection device 2 and a cutting stent 1, and a balloon 33 is used to expand the stenotic blood vessel, thereby establishing an effective channel and creating an insertion space for subsequent operations; then a second catheter 32 is extended to the distal end and passes over the atherosclerotic plaque, and then the in-vivo collection device 2 and the cutting stent 1 are extended to the distal end and the second catheter 32 is withdrawn from the body, and the in-vivo collection device 2 and the cutting stent 1 are automatically switched to the expanded state in the vascular structure A such as the artery and vein; the cutting stent 1 is used to expand the stenotic blood vessel; Atherosclerotic plaques or thrombi are mechanically cut, breaking down large pieces of pathological material into tiny particles that can migrate with the bloodstream. Simultaneously, the in-vivo collection device 2 instantly captures and collects most of the debris in situ. To further ensure safety, the in-vitro protection branch 4 acts as a dual-protection system, continuously filtering residual particles not captured by the in-vivo device, forming a full-pathway protection system from the vascular lumen to the outside of the body. After the procedure is completed, the cutting stent 1 and in-vivo collection device 2 are placed into the first catheter 31 via the delivery guidewire 7, and the medium in the balloon 33 is extracted until the balloon 33 becomes deflated, and then the treatment component is withdrawn from the body. This three-level synergistic mechanism (plaque cutting → dual collection → in-vitro filtration) not only significantly improves surgical debridement efficiency, but also minimizes the risk of debris embolism through a hierarchical protection design. It combines the clinical advantages of minimally invasive interventional treatment with less trauma and faster recovery. At the same time, through the dual action mechanism of mechanical removal and physical protection, it ensures the efficacy and operational safety of treating stenosis of vascular structures such as arteries and veins.

[0058] The above is a detailed introduction to the specific implementation methods of the present application. For those skilled in the art, several improvements and modifications can be made to the present application without departing from the principles of the present application. These improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A vascular stenosis treatment assembly, characterized by: The device comprises a cutting stent, an in vivo collection device, a balloon catheter, and an in vitro protection branch. The cutting stent and the in vivo collection device are slidably arranged in the balloon catheter. The cutting stent and the in vivo collection device can be extended from the balloon catheter and released to an expanded state. The in vivo collection device and the cutting stent are made of a memory metal material. The cutting stent is located at the proximal end of the in vivo collection device, and the cutting stent is located at the distal end of the atherosclerotic plaque or thrombus; The inlet of the extracorporeal protection branch is communicated with a vascular structure, and the outlet is communicated with a normal proximal thick vein, and the communication position between the inlet and the vascular structure is located at the distal end of the in vivo collection device.

2. The vascular stenosis treatment assembly according to claim 1, characterized in that: The in-vivo collection device is connected to the distal end of the cutting stent, and the in-vivo collection device and the cutting stent move synchronously.

3. The vascular stenosis treatment assembly according to claim 2, characterized in that: When the in-vivo collection device is in an expanded state, it is a mesh structure, and its outer diameter gradually increases in a direction away from the cutting stent.

4. The vascular stenosis treatment assembly according to claim 3, characterized in that: The mesh of the in vivo collection device is a polygonal structure.

5. The vascular stenosis treatment assembly according to claim 1, characterized in that: The inlet and outlet of the extracorporeal protection branch are communicated with each other through a catheter, and a flow control device is provided on the catheter.

6. The vascular stenosis treatment assembly according to claim 5, characterized in that: A filtering device is further provided between the flow control device and the outlet of the extracorporeal protection branch.

7. The vascular stenosis treatment assembly according to claim 5, characterized in that: The opening degree of the flow control device is determined based on a basal value of cerebral blood flow.

8. The vascular stenosis treatment assembly according to claim 1, characterized in that: The balloon catheter includes a first catheter, a second catheter and a balloon. The balloon is connected to the distal end of the first catheter. The second catheter is slidably inserted into the first catheter. The cutting stent and the in vivo collection device are slidably inserted into the second catheter.

9. The vascular stenosis treatment assembly according to claim 2, characterized in that: When the cutting stent is in an expanded state, it is a mesh structure with polygonal meshes, the proximal end of which is connected to the delivery guide wire through a first fixing structure, and the distal end of which is connected to the in vivo collection device through a second fixing structure.

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