Venous valve destruction structure for deep vein transcatheter arterization

Abstract

The invention relates to a venous valve destruction structure for deep vein transcatheter arterization, and belongs to the technical field of medical devices, the venous valve destruction structure comprises a transcatheter, a venous valve knife and a limiting device, the venous valve knife is inserted in the transcatheter, the venous valve knife is provided with a moving rod, one end of the moving rod is provided with a venous valve blade with an expandable or contractible volume, and the other end of the moving rod is provided with the limiting device. The vein valve blade is retracted into the transcatheter, or the vein valve blade extends out of the transcatheter, and a handle is arranged at the other end of the moving rod; the limiting device is used for limiting the moving position of the venous valve knife and can be rotatably arranged outside the transcatheter, the venous valve knife penetrates through the interior of the limiting device, and the limiting device is connected with the moving rod through threads; the device has the advantages that the limiting device is rotated, the handle is controlled, the vein valve blade moves in one direction, the vein valve blade extends out of the transcatheter, and the vein valve is damaged through linear movement and rotation of the vein valve blade.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and specifically relates to a venous valve destruction structure for deep vein arterialization via catheter. Background Technology

[0002] Patients with chronic lower limb ischemia can be treated with revascularization, including balloon angioplasty with stent implantation and plaque excision. However, 50% of patients with chronic lower limb ischemia have no revascularization option due to extensive obstruction of the outflow tract below the popliteal artery and require below-knee amputation.

[0003] For the first time published in the authoritative medical journal *The Lancet*, a method has been developed to transpose an artery into a vein by using venous perfusion as an alternative to arterial perfusion, thus saving patients suffering from ischemia, necrosis, or even amputation due to lack of arterial perfusion. However, a challenge exists during open or interventional transposition surgery: unlike arteries, veins flow distally towards the heart. To counteract the effects of gravity, the veins in the lower limbs contain numerous venous valves, which can interfere with the effective flow of blood from the transposed artery to the distal limb. Therefore, a device is needed to disrupt the patient's venous valves, preventing them from closing completely and allowing the transposed arterial blood to flow distally to the limb. Summary of the Invention

[0004] This invention provides a venous valve destruction structure for deep vein arterialization via catheter, which solves the technical problems of venous valve destruction in the prior art. A rotating limiting device is tightened on the catheter and operated by a handle. The venous valve blade moves to the left and extends out of the catheter. The handle is then operated to rotate the venous valve blade. The linear movement and rotation of the venous valve blade destroy the venous valve.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] A venous valve disruption structure involving arterialization of deep veins via catheter, comprising:

[0007] via catheter;

[0008] A venous valve knife is inserted into a catheter. The venous valve knife has a moving rod, one end of which is equipped with a venous valve blade that can expand or contract. The venous valve blade can be retracted into the catheter or extended out of the catheter. The other end of the moving rod is equipped with a handle.

[0009] The limiting device is used to restrict the linear movement of the venous valve knife. It is rotatable and tightenable and is sleeved on the outside of the catheter. There is a gap between the limiting device and the moving rod. The venous valve knife is sleeved inside the limiting device and passes through the gap.

[0010] Rotate the limiting device and tighten it outside the catheter. Operate the handle to move the venous valve blade in one straight line, and the venous valve blade extends outside the catheter. Operate the handle to move the venous valve blade in another straight line, and the venous valve blade retracts into the catheter.

[0011] To further explain, the venous valve blade has multiple blades arranged in a uniform array around the circumference of the catheter's axis. The number of blades can range from 1 to 8, such as three blades. The circumferential spacing between the blades is equidistant, such as 120°, or it can be non-equidistant, such as consisting of 135°, 135°, and 90°.

[0012] To further explain, the blade is equipped with a cutting blade, which is used for the venous valve knife to rotate and cut and destroy the venous valve. The blades are connected by an annular radiopaque ring.

[0013] To further explain, the surface of the venous valve knife is coated with a hydrophilic coating, which reduces the resistance to the movement of the venous valve knife within the blood vessel after being moistened with water.

[0014] To further explain, an injection channel is provided on the catheter. The injection channel is angled and connected to the catheter. Normal saline is injected into the injection channel to moisten the venous valve knife. The injection channel is then sealed with a cap.

[0015] To further explain, one end of the moving rod is equipped with a mesh protective device that can expand or contract in volume. The end of the mesh protective device away from the moving rod is connected to the sheet knife through an annular imaging ring. The mesh protective device can be retracted into the conduit or can extend out of the conduit.

[0016] To further explain, by rotating and tightening the limiting device, operated by the handle, the mesh protection device moves in a straight line and extends out of the catheter. The mesh protection device expands in volume and intercepts valve fragments that fall off during venous valve cutting.

[0017] Manipulated by the handle, the mesh protection device moves in another straight line direction, retracts into the catheter, and shrinks in volume. The mesh protection device collects valve fragments that fell off during venous valve cutting.

[0018] To further explain, the conduit is fitted inside the limiting device, and the limiting device is connected to the conduit by a threaded connection, which allows the limiting device to be detachably fitted onto the outside of the conduit.

[0019] Further explanation includes a balloon occlusion device for assisting in the destruction of venous valves. The balloon occlusion device has a tube body with a balloon inflation channel, a first liquid injection channel, and a second liquid injection channel.

[0020] To further explain, the tube body is equipped with a occlusion balloon, which is connected to the balloon inflation channel.

[0021] The beneficial effects of this invention are:

[0022] 1. The venous valve knife of the present invention is inserted into a transcatheter. The venous valve knife has a moving rod, and the left end of the moving rod is provided with a venous valve blade whose volume can expand or contract. The venous valve blade is retracted into the transcatheter or extends out of the transcatheter. The right end of the moving rod is provided with a handle. A limiting device is used to restrict the movement position of the venous valve knife. The limiting device is rotatable and tightened on the outside of the transcatheter. The venous valve knife passes through the inside of the limiting device. The limiting device and the moving rod are connected by threads. After the limiting device is tightened and the handle is operated, the venous valve blade moves to the left and the venous valve knife extends out of the transcatheter. By operating the handle and rotating the venous valve blade, the venous valve is destroyed through the linear movement and rotation of the venous valve blade.

[0023] 2. This invention relates to a balloon occlusion device for assisting in the destruction of venous valves. The device comprises a tubular body with a balloon inflation channel, a first liquid injection channel, and a second liquid injection channel. An occlusion balloon is mounted on the tubular body and is connected to the balloon inflation channels. The balloon inflation channels are used to inflate the occlusion balloon. The first liquid injection channel is used to add an embolic agent, serving as a contrast agent channel. The second liquid injection channel allows for the injection of liquid. By occluding the balloon and pressurizing the second liquid injection channel, the direction of blood flow is altered, thereby destroying the venous valves. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure from the main view direction of the present invention;

[0026] Figure 2 This is a partial cross-sectional structural diagram of the present invention;

[0027] Figure 3 This is a schematic diagram of the venous valve knife of the present invention during operation;

[0028] Figure 4 For the present invention Figure 3 A schematic diagram of the structure at point AA;

[0029] Figure 5 A schematic diagram of the structure of the invention with the added mesh protection device;

[0030] Figure 6 This is a schematic diagram illustrating the operation of the invention when inserted into a vein;

[0031] Figure 7 This is a schematic diagram of the operation of the venous valve knife of the present invention passing through the venous valve;

[0032] Figure 8 This is a schematic diagram illustrating the operation of the present invention, which involves a catheter passing through a venous valve.

[0033] Figure 9 This is a schematic diagram of the working state of the venous valve knife of the present invention after it passes through the venous valve;

[0034] Figure 10 This is a schematic diagram of the balloon occlusion device of the present invention from the front view.

[0035] Figure 11 This is a schematic diagram of the working state structure of the balloon occlusion device of the present invention;

[0036] Figure 12 This is a schematic diagram of a scenario working state of the present invention;

[0037] Figure 13 This is a schematic diagram of another scenario operation state of the present invention;

[0038] Figure 14 This is a schematic diagram of the working state of the balloon occlusion device of the present invention applied in another scenario.

[0039] icon:

[0040] 1-Cadre, 2-Venous valve knife, 3-Injection channel, 4-Limiting device, 5-Cap, 6-Venous valve blade, 7-Handle, 8-Circular imaging ring, 9-Mesh protection device, 11-Gap, 21-Moving rod, 41-Slit, 61-Sheet knife, 62-Cutting blade, 100-Balloon occlusion device, 101-Tube body, 102-Balloon inflation channel, 103-First liquid injection channel, 104-Second liquid injection channel, 105-Occlusion balloon. Detailed Implementation

[0041] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0042] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0043] 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to welding, bolting, or riveting; they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] Example 1

[0046] like Figure 1 As shown, this embodiment provides a venous valve destruction structure for deep vein arterialization via catheter, including: a catheter 1, a venous valve knife 2, and a limiting device 4. The venous valve knife 2 is inserted into the catheter 1 and has a movable rod 21. One end of the movable rod 21 (i.e., Figure 1 The left end of the catheter 1 is provided with a venous valve blade 6 that can expand or contract in volume. The venous valve blade 6 is retracted into the catheter 1, or the venous valve blade 6 extends out of the catheter 1. The other end of the moving rod 21 (i.e. Figure 1 A handle 7 is provided on the right end;

[0047] The limiting device 4 is rotatably and tightenably sleeved on the outside of the catheter 1. After being tightened on the catheter 1, the limiting device 4 is used to restrict the movement of the venous valve knife 2 (the limiting device 4 can restrict the venous valve knife 2 from moving to the left). The limiting device 4 is detachably set on the outside of the catheter 1. There is a gap 41 between the limiting device 4 and the moving rod 21. The venous valve knife 2 passes through the gap 41 inside the limiting device 4.

[0048] like Figure 2As shown, the conduit 1 is fitted inside the limiting device 4. The conduit 1 and the limiting device 4 are connected by threads. The limiting device 4 can be detached from the conduit 1. There is a gap 41 between the limiting device 4 and the moving rod 21, which can prevent sliding friction between the limiting device 4 and the moving rod 21.

[0049] from Figure 2 It can be seen that after the limiting device 4 is tightened on the catheter 1, the limiting device 4 restricts the venous valve knife 2 from moving to the left. After the limiting device 4 is loosened and removed from the catheter 1, the venous valve knife 2 moves to the right, and the venous valve blade 6 moves to the right and extends out of the catheter 1.

[0050] The forward rotation limiting device 4 is tightened on the catheter 1. The operating handle 7 is held by hand. The operating handle 7 pushes the venous valve blade 6 to move in one direction, that is, the venous valve blade 6 moves to the left, and the venous valve blade 2 extends out of the catheter 1. The operating handle 7 is held by hand. The operating handle 7 pulls the venous valve blade 6 to move in one direction, that is, the venous valve blade 6 moves to the right, and the venous valve blade 2 is retracted into the catheter 1.

[0051] The limiting device 4 is rotated in the opposite direction and loosened on the catheter 1. After the limiting device 4 is removed from the catheter 1, the operating handle 7 is held by hand, and the venous valve blade 6 continues to move in the other direction, that is, the venous valve blade 6 continues to move to the right, and the venous valve knife 2 extends out from the catheter 1.

[0052] Example 2

[0053] Based on Example 1, such as Figure 3 -like Figure 4 As shown, the forward rotation limiting device 4 tightens the limiting device on the catheter 1. Holding the operating handle 7, the venous valve blade 6 moves to the left, extending beyond the catheter 1. The venous valve blade 6 expands in volume. After extending beyond the catheter 1, the operating handle 7 is rotated again, allowing the venous valve blade 6 to rotate. The venous valve blade 6 has multiple blades 61, which are evenly arrayed around the axis of the catheter 1. The multiple blades 61 destroy the venous valve in the direction of the axis of the catheter 1. The blades 61 are equipped with cutting blades 62, which are used for the venous valve blade 61 to rotate and cut and destroy the venous valve. The blades 61 and the cutting blades 62 rotate simultaneously, cutting and destroying the venous valve. The blades 61 are connected by an annular imaging ring 8, which is used for imaging the position of the venous valve blade 6.

[0054] like Figure 2As shown, the surface of the venous valve knife 2 is coated with a hydrophilic coating, which reduces the resistance to movement of the venous valve knife 2 within the blood vessel after being moistened with water. An injection channel 3 is provided on the catheter 1, and the injection channel 3 is inclined and connected to the catheter 1. Normal saline is injected into the injection channel 3 and moistens the venous valve knife 2 through the gap 11 between the moving rod 21 and the inside of the catheter 1. The injection channel 3 is closed by a cap 5. Contrast agent can also be added to the injection channel 3, and the contrast agent, combined with the ring-shaped contrast agent 8, performs contrast imaging.

[0055] like Figure 5 As shown, one end of the moving rod 21, i.e. the left end, is provided with a mesh protective device 9 whose volume can expand or contract. The end of the mesh protective device 9 away from the moving rod 21, i.e. the left end of the protective device 9, is connected to the sheet knife 61 through the annular imaging ring 8. The mesh protective device 9 can be retracted into the conduit 1, or the mesh protective device 9 can extend out of the conduit 1.

[0056] Rotate the limiting device 4 in the forward direction and tighten the limiting device 4. Operate the handle 7, and the venous valve blade 6 and the mesh protection device 9 move to the left at the same time. The venous valve blade 6 and the mesh protection device 9 extend out of the catheter 1 at the same time. The venous valve blade 6 and the mesh protection device 9 expand in volume at the same time. Operate the handle 7 again to make the venous valve blade 6 and the mesh protection device 9 rotate at the same time. The mesh protection device 9 intercepts valve fragments that fall off during the cutting of the venous valve (larger valve fragments can be intercepted by the mesh protection device 9).

[0057] While keeping the limiting device 4 tightened, the operating handle 7, the venous valve blade 6, and the mesh protection device 9 move to the right simultaneously, and the venous valve blade 6 and the mesh protection device 9 are simultaneously retracted into the catheter 1. The venous valve blade 6 and the mesh protection device 9 shrink in volume simultaneously, and the mesh protection device 9 collects the valve fragments that fall off during the venous valve cutting (smaller valve fragments can be collected inside the mesh protection device 9, and the shrinkage of the mesh protection device 9 allows smaller valve fragments to be collected inside the mesh protection device 9).

[0058] Reverse rotation of the limiting device 4 and loosening or removing the limiting device 4, operation of the handle 7, and simultaneous rightward movement of the venous valve blade 6 and the mesh protection device 9 retrieved through the catheter 1 until the venous valve blade 6 and the mesh protection device 9 extend out of the catheter 1.

[0059] Example 3

[0060] Based on Embodiments 1 and 2, an open vascular window is formed through open surgery or a vascular access is formed through interventional surgery; the venous valve knife 2 is delivered through the opening to the distal end of the venous valve to be destroyed; the length of the moving rod 21 of the venous valve knife 2 is between 40cm and 98cm, and the diameter of the venous valve knife 2 is between 1.5 and 6mm; the limiting device 4 of the venous valve knife is initially in a tightened state to prevent the venous valve knife 2 from being accidentally pushed out of the catheter 1. When needed, the limiting device 4 is loosened, and the advancing handle 7 or handle can be pushed to advance the venous valve knife 2 forward. The venous valve blade 6 has a blade 61, and the number of blades 61 is 1-8. If there are three blades 61, the circumferential spacing between them can be equal, such as 120° between each blade 61, or non-equal, such as 135°, 135°, and 90° between adjacent blades 61. The blade 61 may contain 1-4 cutting blades 62, which facilitates cutting the valve from multiple directions.

[0061] When not in use, the injection channel 3 is sealed by the cap 5. Before using the venous valve knife 2, the cap 5 is removed. The injection channel 3 is connected to the Luer interface, which can be connected to a syringe to lubricate the venous valve knife 2 inside the catheter 1 (the surface of the venous valve knife 2 is coated with a hydrophilic coating, which can reduce its resistance to movement in the blood vessel after lubrication). At the same time, the air trapped in the space 11 and the venous valve knife 2 is drained to reduce air embolism.

[0062] The mesh protective device 9 is an optional device configured as a protective measure. Depending on the blood flow during cutting, it can be positioned at the front (left end, in the direction of venous blood flow, centripetal flow) or rear (right end, in the direction of arterial blood flow, distal flow) of the venous valve knife 2. By retracting to wrap around the inside of the transcatheter 1 and by retracting forward to extend into the inside of the transcatheter 1, it intercepts valve fragments and microthrombi that fall off during venous valve cutting in a release manner, protecting the patient's centripetal or distal blood vessels and improving the success rate of the surgery.

[0063] The position of the venous valve knife 2 can be determined by opening the incision or by ultrasound (DSA). Once it is determined that the position is correct, the protective sheath of the venous valve knife 2 can be moved backward and to the right to expose the venous valve knife 2. Then, the venous valve knife 2 can be pushed forward to destroy the venous valve.

[0064] like Figure 6 As shown, a is a vein, and b is a venous valve or venous valve membrane. Tighten the limiting device 4, and insert the catheter 1 and venous valve knife 2 together into vein a. Continue to move forward or to the left through the catheter 1 and venous valve knife 2, as shown... Figure 7 As shown, the venous valve knife 2 passes through the venous valve and continues to move forward or to the left through the catheter 1 and the venous valve knife 2, as... Figure 8 As shown, catheter 1 passes through the venous valve.

[0065] like Figure 9 As shown, holding the control handle 7 and the catheter 1, the venous valve blade 6 moves to the left, extending beyond the catheter 1. The venous valve blade 6 expands in volume, and the catheter 1 and the venous valve blade 2 move to the right together. The venous valve blade 6 destroys the venous valve. Holding the catheter 1 and rotating the control handle 7, the venous valve blade 2 rotates relative to the catheter 1, and the venous valve blade 6 destroys the venous valve.

[0066] Example 4

[0067] like Figure 10 -like Figure 11 As shown, this embodiment provides a balloon occlusion device 100 for assisting in the destruction of venous valves. The balloon occlusion device 100 includes a tube body 101, on which are opened balloon inflation channels 102, a first liquid injection channel 103, and a second liquid injection channel 104. An occlusion balloon 105 is provided on the tube body 101, and the occlusion balloon 105 is connected to the balloon inflation channels 102, which are used to inflate the occlusion balloon 105. The first liquid injection channel 103 is used to add embolic agent and serves as a contrast agent channel. The second liquid injection channel 104 can inject liquid, changing the direction of blood flow by applying pressure.

[0068] like Figure 12 As shown, c is the pedis vein, d is the plantar digit vein, e is the medial plantar digit vein, and f is the lateral plantar digit vein. Before the transposition surgery, as... Figure 6 He Ru Figure 12 As shown, vein a connects to the foot vein c, and blood flows from vein a to the foot vein c. Blood in the foot vein c flows through the toe plantar vein d to the medial plantar vein e and the lateral plantar vein f.

[0069] like Figure 13 As shown, after the transposition surgery, the blood in the plantar vein c flows through the toe plantar vein d to the medial plantar vein e. The blood also flows from the lateral plantar vein f through the plantar venous arch g to the medial plantar vein e, forming a return flow. This fails to reach the distal vessels supplied by the toe plantar vein d and the plantar vein c, resulting in a poor transposition effect.

[0070] like Figure 14As shown, a balloon occlusion device 100 is inserted into the medial plantar vein e, the plantar venous arch g, and the lateral plantar vein f. Contrast agent is added to the first liquid injection channel 103 for angiography. The occlusion balloon 105 is located in the medial plantar vein e. Inflation or contrast agent is introduced into the balloon inflation channel 102, and the occlusion balloon 105 occludes the medial plantar vein e. The second liquid injection channel 104 can inject saline or a mixture of contrast agent and saline. By increasing perfusion, the occlusion pressure of the medial plantar vein e is further increased, forcing blood from the toe-foot vein d and the lateral plantar vein f to flow into the medial plantar vein e. Blood from the toe-foot vein d and the lateral plantar vein f flows through the foot vein c to the distal vessels of the toes. The greater pressure can also damage the venous valves in the distal toe capillaries, i.e., vein a, promoting better arterial blood perfusion.

[0071] In this embodiment, after the venous valve knife 2 is withdrawn, it is replaced with a balloon occlusion device 100 to enter the location of venous valve damage. The occlusion balloon 105 is inflated with contrast agent to expand the damaged venous valve and enhance the venous valve destruction effect.

[0072] Specifically, for some distal microvessels with two connected reflux veins, a balloon occlusion device 100 can be used to reverse the blood flow.

[0073] First, the balloon occlusion device 100 reaches the target expansion position under DSA (ultrasound) guidance, inflating the proximal occlusion balloon 105 to block the venous return vessels. The occlusion balloon 105 has an opening at its rear end for connecting to a distal syringe, allowing the injection of saline or a mixture of contrast agent and saline. Through the occlusion balloon 105, saline is injected via the second liquid injection channel 104, altering the blood flow from the heart to the extremities. The occlusion balloon 105 is then depressurized, and the balloon occlusion device 100 is withdrawn. Contrast agent is then used to re-examine the blood flow to the distal limbs via angiography.

[0074] The diameter of the occlusion balloon 105 is between 1.5-6 mm, and the length of the tube 101 is between 40-110 cm. The occlusion balloon 105 is a compliant balloon with a set pressure of 10 atm and a burst pressure of 20 atm. The occlusion balloon 105 can embolize branch vessels.

[0075] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope described in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A venous valve destruction structure for deep vein arterialization via catheter, characterized in that, include: via catheter (1); A venous valve knife (2) is inserted into the transcatheter (1). The venous valve knife (2) has a moving rod (21). One end of the moving rod (21) is provided with a venous valve blade (6) whose volume can expand or contract. The venous valve blade (6) is retracted into the transcatheter (1) or extends out of the transcatheter (1). The other end of the moving rod (21) is provided with a handle (7). A limiting device (4) is used to restrict the linear movement of the venous valve knife (2). It is rotatable and tightenable and is sleeved on the outside of the catheter (1). There is a gap (41) between the limiting device (4) and the moving rod (21). The venous valve knife (2) is sleeved inside the limiting device (4). The venous valve knife (2) passes through the gap (41). Rotate the limiting device (4) and tighten it outside the catheter (1). Operate the handle (7) and the venous valve blade (6) moves in one straight line direction, and the venous valve knife (2) extends out of the catheter (1). Operate the handle (7) and the venous valve blade (6) moves in another straight line direction, and the venous valve knife (2) is retracted into the catheter (1).

2. The venous valve destruction structure for deep vein arterialization via catheter according to claim 1, characterized in that, The venous valve blade (6) has a plurality of blades (61), which are arranged in a uniform array around the axis of the catheter (1).

3. The venous valve destruction structure for deep vein arterialization via catheter according to claim 2, characterized in that, The blade (61) is provided with a cutting blade (62), which is used for the venous valve knife (2) to rotate and cut and destroy the venous valve. Each blade (61) is connected by an annular imaging ring (8).

4. The venous valve destruction structure for deep vein arterialization via catheter according to claim 1, characterized in that, The surface of the venous valve knife (2) is coated with a hydrophilic coating, which reduces the resistance of the venous valve knife (2) to movement within the blood vessel after being moistened with water.

5. The venous valve destruction structure for deep vein arterialization via catheter according to claim 1, characterized in that, The catheter (1) is provided with an injection channel (3), which is inclined and connected to the catheter (1). Physiological saline is injected into the injection channel (3) to moisten the venous valve knife (2). The injection channel (3) is closed by a cap (5).

6. The venous valve destruction structure for deep vein arterialization via catheter according to claim 1, characterized in that, One end of the movable rod (21) is provided with a mesh protective device (9) that can expand or contract in volume. The end of the mesh protective device (9) away from the movable rod (21) is connected to the blade (61) through an annular imaging ring (8). The mesh protective device (9) can be retracted into the conduit (1) or can extend out of the conduit (1).

7. The venous valve destruction structure for deep vein arterialization via catheter according to claim 6, characterized in that, Rotate and tighten the limiting device (4), manipulate the handle (7), the mesh protection device (9) moves in a straight line, the mesh protection device (9) extends out of the transcatheter (1), the mesh protection device (9) expands in volume, and the mesh protection device (9) intercepts valve fragments that fall off during venous valve cutting. Manipulated by the handle (7), the mesh protection device (9) moves in another straight direction, the mesh protection device (9) is retracted into the catheter (1), the mesh protection device (9) shrinks in volume, and the mesh protection device (9) collects valve fragments that fall off during venous valve cutting.

8. The venous valve destruction structure for deep vein arterialization via catheter according to claim 7, characterized in that, The conduit (1) is fitted inside the limiting device (4), and the limiting device (4) and the conduit (1) are connected by a threaded connection, so that the limiting device (4) can be detachably fitted outside the conduit (1).

9. The venous valve destruction structure for deep vein arterialization via catheter according to claim 1, characterized in that, The device includes a balloon occlusion device (100) for assisting in the destruction of venous valves. The balloon occlusion device (100) is provided with a tube body (101), on which a balloon inflation channel (102), a first liquid injection channel (103), and a second liquid injection channel (104) are opened.

10. The venous valve destruction structure for deep vein arterialization via catheter according to claim 9, characterized in that, The tube body (101) is provided with a occlusion balloon (105), which is connected to the balloon inflation channel (102).

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