Thrombectomy catheter

Abstract

The application discloses a thrombus rotary cutting catheter, which comprises an outer tube, an inside of which is a thrombus conveying cavity; a blade platform, which is rotationally arranged at the distal end of the outer tube, and at least one blade positioning opening is arranged on the distal end surface of the blade platform; a conveying type driving mechanism, which is arranged inside the outer tube and connected with the blade platform, and the conveying type driving mechanism is suitable for driving the blade platform to rotate and conveying the rotary cut thrombus; and at least one blade, which is arranged in each blade positioning opening and forms a thrombus inlet between the blade positioning opening and the blade platform, and the angle between the blade and the distal end surface of the blade platform can be adjusted. The application can select the rotating speed of the blade according to the type of the thrombus, is suitable for various types of thrombus, is suitable for cutting fresh thrombus, old thrombus and hardened plaque, and has a wider application range.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a thrombus-cutting catheter. Background Technology

[0002] Thrombosis is caused by an imbalance in the body's coagulation regulation mechanism due to various factors. Its formation is attributed to factors including damage to vascular endothelial cells, slowed blood flow, and a hypercoagulable state. Thrombosis is becoming increasingly common in clinical practice. It can cause limb swelling, pain, ulcers, and even pulmonary embolism, seriously threatening people's lives and health. Common treatments for thrombosis include medication, thrombolytic therapy, and surgical thrombectomy.

[0003] The goal of drug therapy is to inhibit platelet aggregation and promote anticoagulation, thereby inhibiting thrombus formation. During the acute phase of thrombus formation, drugs can be used for thrombolytic therapy to relieve blockages in blood vessels and clear the blockage. Thrombolytic therapy involves an interventional procedure where a thrombolytic catheter with multiple side holes is placed inside the blood vessel containing the thrombus. A micro-infusion pump slowly releases the thrombolytic drug to the thrombus site over a period of time, increasing the contact area and improving thrombolytic efficiency.

[0004] Surgical thrombectomy involves inserting a catheter into the thrombus site within a blood vessel via an interventional procedure. The thrombus is then removed from the vessel in a short time using methods such as cutting and aspiration. Surgical thrombectomy is a rapid and effective treatment for thrombosis and is widely used due to its unique advantages. Existing thrombectomy devices primarily utilize the principles of aspiration or rotational resection. Aspiration is effective for soft thrombi, but its effectiveness for hard thrombi is limited due to the limited force of the water flow. Rotational resection is effective for soft thrombi, hard thrombi, intimal hyperplasia, and sclerosis, and is expected to become the mainstream method for thrombosis treatment in the future.

[0005] However, existing rotary thrombectomy devices suffer from drawbacks such as low efficiency, poor resection performance, complex operation, poor safety, and inability to bend excessively, thus affecting treatment outcomes. Furthermore, existing rotary thrombectomy devices are only suitable for removing certain types of thrombi. The resection force required for removing soft thrombi differs from that required for removing hard thrombi; devices designed for soft thrombi cannot cut hard thrombi, resulting in a limited range of applicability. Different types of rotary thrombectomy devices are needed to remove different types of thrombi. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the existing rotary thrombectomy devices are only applicable to the removal of a certain type of thrombus, resulting in a limited scope of application, and thus provide a thrombus rotary thrombectomy catheter.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] Thrombus-removing catheters, including:

[0009] The outer tube contains a thrombus delivery chamber.

[0010] A blade platform is rotatably mounted at the far end of the outer tube, and at least one blade positioning port is provided on the far end face of the blade platform;

[0011] A delivery drive mechanism is disposed inside the outer tube and connected to the blade platform. The delivery drive mechanism is adapted to drive the blade platform to rotate and can deliver the thrombus after rotary cutting.

[0012] At least one blade is disposed within each blade positioning port and forms a thrombus inlet between the blade positioning port and the blade positioning port, and the angle between the blade and the distal end face of the blade platform can be adjusted; the blade is adapted to operate at low speed when cutting soft thrombi so as to be housed within the blade positioning port; the blade is adapted to operate at high speed when cutting hard thrombi, forming an angle between the blade and the distal end face of the blade platform to enhance cutting force.

[0013] To further optimize the technical solution, a top hole is provided at the center of the distal end face of the blade platform for the guide wire to pass through.

[0014] The technical solution is further optimized. The blade positioning port is a rectangular port. The inner sidewall of the blade positioning port is divided into a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall. The first sidewall and the second sidewall are arranged opposite to each other, and the third sidewall and the fourth sidewall are arranged opposite to each other.

[0015] Mounting holes and limiting holes are respectively provided on the first sidewall and the second sidewall;

[0016] And / or the third and fourth sidewalls are inclined to facilitate the flow of the cut thrombus into the outer tube.

[0017] To further optimize the technical solution, the blade includes a top plate and two side plates, with a cutting edge disposed between the two side plates and the top plate; the two side plates are respectively provided with a mounting part that rotatably mates with the mounting hole and a limiting part that mates with the limiting hole, and the line connecting the two mounting parts forms the mounting shaft axis; the limiting part can move within the limiting hole so that the blade can be angled.

[0018] To further optimize the technical solution, the limiting part is in the shape of an arc segment; the limiting holes are distributed in a spiral shape, and the radius of the limiting holes decreases as the blade swing angle increases.

[0019] To further optimize the technical solution, the blade is trapezoidal in shape, with the side of the blade furthest from the blade platform axis being larger and the side of the blade closest to the blade platform axis being smaller; the center of gravity of the blade is higher than the mounting shaft axis, so that the blade tends to have a larger angle when subjected to centrifugal force.

[0020] To further optimize the technical solution, a base is also provided between the outer tube and the blade platform. The base is made of metal and its outer surface is coated with DLC coating.

[0021] To further optimize the technical solution, the blade platform has at least one side opening on its side, which is connected to the inside of the outer tube, and a blade is provided on at least one side of the side opening.

[0022] To further optimize the technical solution, the outer tube is a flexible tube that can bend and change shape to follow the curvature of the blood vessel.

[0023] To further optimize the technical solution, the delivery drive mechanism includes a rotary spring and a rotary power mechanism. The rotary spring and the thrombus delivery chamber constitute a delivery mechanism. One end of the rotary spring is connected to the blade platform, and the other end of the rotary spring is connected to the rotary power mechanism. The rotary spring is adapted to rotate under the drive of the rotary power mechanism to drive the blade platform to rotate and deliver the thrombus after rotary cutting inside the outer tube.

[0024] The technical solution of this invention has the following advantages:

[0025] 1. The thrombectomy catheter provided by this invention allows for selection of the appropriate blade rotation speed based on the type of thrombus. Specifically, when cutting soft thrombi, the blade operates at a low speed and is contained within the blade positioning port, resulting in minimal cutting force on the thrombus. This reduces damage to blood cells during thrombectomy, lessens the burden on the kidneys, and avoids postoperative complications such as hematuria. When cutting hard thrombi, the blade operates at a high speed, increasing the centrifugal force on the blade, increasing the blade's swing angle, and allowing it to extend beyond the blade positioning port. Furthermore, the angle between the blade and the distal end face of the blade platform is adjustable, enhancing the cutting force and achieving effective cutting of hard thrombi. Therefore, this invention is applicable to various types of thrombi, including fresh thrombi, old thrombi, and sclerotic plaques, thus broadening its applicability.

[0026] This invention employs a rotational thrombectomy method, which improves the efficiency, resection performance, and surgical safety of thrombectomy treatment. It is highly efficient, has strong resection performance, is easy to operate, and has good stability. While ensuring the effectiveness and safety of thrombectomy, it avoids the influence of potential factors on the treatment.

[0027] 2. The thrombectomy catheter provided by the present invention has a blade positioning port on the distal surface of the blade platform, and a blade is installed in the blade positioning port. During the thrombectomy process, it is not necessary to pass through the thrombus before cutting it. The guide wire only needs to pass through the lesion first to guide the thrombectomy catheter to the thrombus site. The thrombus can be directly cut by the blade on the distal surface of the blade platform, which effectively avoids the risk of distal embolism when passing through the thrombus.

[0028] 3. The thrombectomy catheter provided by the present invention has a good safety profile because the blade is located in the blade positioning port on the distal end of the blade platform and the outer diameter of the blade platform completely covers the blade. During the thrombectomy process, the blade will not touch the blood vessel wall and will not cause damage to the blood vessel.

[0029] 4. The thrombus cutting catheter provided by this invention has helically distributed limiting holes, and the radius of the limiting holes decreases as the blade swing angle increases. When the blade angle is 0°, the blade and the blade platform have a clearance fit. As the angle increases, the fit between the blade and the blade platform becomes an interference fit, and the interference gradually increases. This requires a greater centrifugal force to further increase the blade angle, thus necessitating a higher rotational speed to provide greater centrifugal force. Furthermore, with the increased blade angle, the blade positioning port of the blade platform fits more tightly, enabling the cutting of harder thrombi.

[0030] 5. The thrombectomy catheter provided by the present invention has a blade whose center of gravity is higher than the mounting axis, so that the blade tends to have a larger angle when subjected to centrifugal force. As a result, the greater the centrifugal force on the blade, the greater the angle between the blade and the distal end face of the blade platform.

[0031] 6. The thrombectomy catheter provided by the present invention has a flexible outer tube, specifically a plastic tube, which has good flexibility and can bend and change with the curvature of the blood vessel. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of the present invention;

[0034] Figure 2 This is a side view of the blade of the present invention;

[0035] Figure 3 This is a schematic diagram of the blade of the present invention;

[0036] Figure 4 This is a schematic diagram of the blade of the present invention from another perspective;

[0037] Figure 5 This is a schematic diagram of the blade platform of the present invention;

[0038] Figure 6 This is a schematic diagram of the mounting holes and limiting holes of the present invention;

[0039] Figure 7 This is a schematic diagram of the structure when the limiting part of the present invention is limited to the limiting hole;

[0040] Figure 8 This is a schematic diagram showing the force situation of the blade of the present invention under centrifugal force;

[0041] Figure 9 This is a schematic diagram of the force situation when the blade of the present invention is subjected to centrifugal force. Figure 2 ;

[0042] Figure 10 This is a schematic diagram showing the torque generated by the blade of the present invention under the action of F1 and the supporting force;

[0043] Figure 11 This is a cross-sectional view of the blade positioning port when the blade of the present invention is at its maximum angle;

[0044] Figure 12 This is a schematic diagram of thrombus flow when the blade of the present invention is at its maximum angle;

[0045] Figure 13 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0046] Figure 14 This is a schematic diagram of the blade platform according to Embodiment 2 of the present invention;

[0047] Figure 15 This is a schematic diagram of the base structure of Embodiment 2 of the present invention.

[0048] Figure label:

[0049] 100. Thrombus-cutting catheter;

[0050] 110. Blade; 111. Top plate; 112. Blade edge; 113. Mounting shaft; 114. Limiting part; 115. Side plate;

[0051] 120. Blade platform; 121. Top hole; 122. Blade positioning port; 124. Mounting hole; 125. Limiting hole; 126. Limiting hole edge line.

[0052] 130. Base;

[0053] 140. Rotary spring;

[0054] 150. External pipe. Detailed Implementation

[0055] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal communication between two components. The term "distal end" generally refers to the end of the medical implant furthest from the operator; "proximal end," in contrast to "distal end," refers to the end of the medical implant closer to the operator. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0058] Example 1

[0059] like Figures 1 to 12 As shown, this embodiment discloses a thrombus cutting catheter, including: an outer tube 150, a blade platform 120, a delivery drive mechanism, and a blade 110.

[0060] The outer tube 150 has a hollow interior, which serves as a thrombus delivery cavity. The outer tube 150 can be inserted into the blood vessel. The sides of the outer tube 150 are closed. Figure 1 The outer tube 150 in the diagram is a structural schematic diagram after the side is cut open.

[0061] The blade platform 120 is rotatably disposed at the far end of the outer tube 150, and at least one blade positioning port 122 is provided on the far end surface of the blade platform 120.

[0062] The delivery drive mechanism is located inside the outer tube 150 and connected to the blade platform 120. The delivery drive mechanism is suitable for driving the blade platform 120 to rotate and can deliver the thrombus after rotary cutting.

[0063] At least one blade 110 is provided, each disposed within a blade positioning port 122, forming a thrombus entry point between the blade 110 and the blade positioning port 122, and the angle between the blade 110 and the distal face of the blade platform 120 can be adjusted. Because the blade 110 is located within the blade positioning port 122 on the distal face of the blade platform 120, the outer diameter of the blade platform 120 completely encompasses the blade. During thrombectomy, the blade 110 will not touch the blood vessel wall, will not cause damage to the blood vessel, and has good safety.

[0064] The aforementioned thrombectomy catheter allows for selection of the appropriate rotation speed for the blade 110 based on the type of thrombus. Specifically, when cutting soft thrombi, the blade 110 operates at a low speed and is contained within the blade positioning port 122, resulting in minimal cutting force and reducing damage to blood cells during thrombectomy, thus lessening the burden on the kidneys and preventing postoperative complications such as hematuria. When cutting hard thrombi, the blade 110 operates at a high speed, increasing the centrifugal force on it, widening its swing angle, and allowing it to extend beyond the blade positioning port 122. Furthermore, the angle between the blade 110 and the distal face of the blade platform 120 is adjustable, enhancing the cutting force and achieving effective cutting of hard thrombi. Therefore, this invention is applicable to various types of thrombi, including fresh thrombi, old thrombi, and sclerotic plaques, thus broadening its applicability.

[0065] Several devices based on the principle of thrombus rotation resection are now available for thrombus removal. For example, Chinese invention patent CN115024790A discloses a distal stent-type mechanical thrombectomy catheter. While this device can effectively remove thrombi and reduce damage to the vessel wall, the distal end of the catheter must first pass through the thrombus to release a stent before cutting. The complex structure of the distal end of the catheter determines its minimum diameter, significantly limiting the usable diameter of the vessel. Furthermore, the process of the distal end of the catheter passing through the thrombus involves a pushing force on the thrombus, posing a risk of pushing the thrombus away from the vessel wall and causing distal embolism.

[0066] To solve the above-mentioned technical problems, the present invention provides a blade positioning port 122 on the distal surface of the blade platform 120, and installs a blade 110 in the blade positioning port 122. During the thrombus removal process, it is not necessary to pass through the thrombus before removing it. The guide wire only needs to pass through the lesion first to guide the thrombus cutting catheter 100 to the thrombus site. The thrombus can be directly removed by the blade 110 on the distal surface of the blade platform 120, which effectively avoids the risk of distal embolism when passing through the thrombus.

[0067] In one specific implementation, the delivery drive mechanism includes a rotary spring 140 and a rotary power mechanism. The rotary spring 140 and the thrombus delivery chamber constitute the delivery mechanism. The rotary spring 140 is disposed inside the outer tube 150. One end of the rotary spring 140 is connected to the blade platform 120, driving the blade platform 120 to rotate. The other end of the rotary spring 140 is connected to the rotary power mechanism and receives its power to rotate. The rotary power mechanism is the power source of the thrombectomy device. The rotary spring 140 is adapted to rotate under the drive of the rotary power mechanism to drive the blade platform 120 to rotate and deliver the cut thrombus inside the outer tube 150. In this embodiment, the rotary spring 140 simultaneously serves to drive the blade platform 120 to rotate and deliver the cut thrombus.

[0068] The blade platform 120 is disc-shaped, and a top hole 121 for the guidewire to pass through is provided at the center of the distal end face of the blade platform 120. This allows the aforementioned thrombectomy catheter to be guided to the thrombus in the blood vessel via the guidewire, making the movement of the thrombectomy catheter more precise. Guidewire passage through the thrombus site is a prerequisite for almost all interventional treatments, so this requirement is not a special requirement for interventional procedures, greatly expanding the scope of clinical application.

[0069] The blade positioning port 122 is a rectangular opening. The inner sidewalls of the blade positioning port 122 are divided into a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall. The first sidewall and the second sidewall are arranged opposite to each other. The first sidewall is close to the axis of the blade platform 120, and the second sidewall is far away from the axis of the blade platform 120. The third sidewall and the fourth sidewall are arranged opposite to each other.

[0070] Mounting holes 124 and limiting holes 125 are respectively provided on the first and second sidewalls for mounting the blade. The mounting holes 124 are circular, and the limiting holes 125 are segmented.

[0071] The third and fourth sidewalls are inclined to facilitate the flow of the cut thrombus into the outer tube 150, making it easier to collect the cut thrombus.

[0072] The bottom of the blade 110 is hollow. The blade 110 includes a top plate 111 and two side plates 115. A cutting edge 112 is disposed between the two side plates 115 and the top plate 111, and the cutting edge 112 is inclined. Specifically, a trapezoidal inclined side is disposed between the two side plates 115 and the top plate 111, and the cutting edge 112 is disposed on the trapezoidal inclined side.

[0073] Each of the two side plates 115 is provided with a mounting part and a limiting part 114. The mounting part is rotatably fitted with the mounting hole 124 to ensure the accuracy of the blade installation position. The line connecting the two mounting parts forms the mounting shaft axis. The limiting parts 114 have the same radial length and cooperate with the limiting hole 125. When the mounting part of the blade 110 rotates within the mounting hole 124, the limiting part of the blade 110 can move within the limiting hole 125, so that the blade 110 can be angled and the swing angle of the blade 110 is limited by the limiting hole 125. A limiting hole edge line 126 is provided on the limiting hole 125 to limit the position of the limiting part.

[0074] Specifically, the blade's swing angle is between 0° and 45°, meaning the minimum swing angle is 0° and the maximum swing angle is 45°.

[0075] The angle between the blade and the distal face of the blade platform 120 is controlled by adjusting the blade rotation speed. The rotating spring 140 has a certain rotation speed range. At low speeds, the centrifugal force is small and insufficient to allow the blade to leak out of the blade positioning port 122; this speed is suitable for aspirating soft thrombi. At high speeds, the centrifugal force increases, causing the blade to leak out of the blade positioning port 122. As the speed increases, the blade's swing angle is adjusted from 0 to 45° (maximum 45°); high speeds are suitable for cutting hard thrombi.

[0076] As a further improved implementation, the limiting part is arc-shaped, and its outer contour is a standard circle; the limiting holes 125 are distributed in a spiral pattern, that is, the limiting holes 125 are not quarter-circle arcs, but spiral holes, such as... Figure 6 As shown, the radius of the limiting hole 125 decreases as the swing angle of the blade 110 increases; that is, the radius of the limiting hole 125 gradually decreases from right to left. When the blade angle is 0°, the blade 110 and the blade platform 120 are in clearance fit. As the angle increases, the fit between the blade 110 and the blade platform 120 becomes an interference fit, and the interference gradually increases. A greater centrifugal force is needed to further increase the angle of the blade 110, thus requiring a greater rotational speed to provide a greater centrifugal force. Furthermore, as the angle of the blade 110 increases, the fit between the blade 110 and the blade positioning port 122 of the blade platform 120 becomes tighter, enabling the cutting of harder thrombi.

[0077] The blade 110 is trapezoidal in shape, with a larger diameter on the side furthest from the blade platform axis and a smaller diameter on the side closest to the axis. The center of gravity of the blade 110 is higher than the mounting axis, so that the blade 110 tends to have a larger angle when subjected to centrifugal force. The blade positioning port 122 is angled and located on the distal end face of the blade platform 120, so that after the blade 110 is installed in the blade positioning port 122, the central axis of the blade 110 forms an angle with the line connecting the blade's center of gravity to the axis of the blade platform 120. This allows the centrifugal force F acting on the blade to be decomposed into a force F1 perpendicular to the mounting axis and a force F2 parallel to the mounting axis. Figure 8 As shown. When the entire device rotates, the blade 110 is subjected to centrifugal force. This centrifugal force is decomposed into a force F1 perpendicular to the mounting axis and a force F2 parallel to the mounting axis (which can be considered as a force at the center of gravity). In the direction perpendicular to the mounting axis, the blade receives a support force from the mounting hole corresponding to force F1, as shown. Figure 9 As shown. Because the center of gravity of the blade is higher than the axis of the mounting shaft 113, a torque is generated under the action of force F1 and the supporting force, causing the blade angle to tend to increase. Consequently, the greater the centrifugal force on the blade, the larger the angle between the blade and the distal end face of the blade platform 120 becomes, as shown. Figure 10 As shown.

[0078] A base 130 is also provided between the outer tube 150 and the blade platform 120. The base 130 is coaxially arranged with the outer tube 150, and one end of the base 130 is fitted with the inner diameter of the outer tube 150. The base 130 is made of metal and its outer surface is coated with DLC coating, which has an extremely low coefficient of friction and high wear resistance, allowing the blade platform 120 to rotate on its end face without damage.

[0079] As a further improved implementation, the outer tube 150 is a flexible tube, specifically a plastic tube, which has good flexibility and can bend and change according to the curvature of the blood vessel.

[0080] This invention also discloses a method for using a thrombectomy catheter, comprising the following steps:

[0081] S1. The guidewire is first inserted into the blood vessel, and after passing through the thrombus site, it is passed a distance further distally to ensure that the thrombus cutting catheter completely cuts the thrombus.

[0082] S2. Insert the thrombus-cutting catheter through the top hole 121 onto the guidewire and deliver it along the guidewire to the proximal end of the thrombus site in the blood vessel.

[0083] S3. Select the appropriate rotation speed according to the patient's thrombus type. When the patient's thrombus is soft, set the thrombus cutting catheter to low speed; when the patient's thrombus is hard, set the thrombus cutting catheter to high speed.

[0084] S4. Start the conveyor drive mechanism, which drives the blade platform 120 to rotate via the rotary spring 140, thereby driving the blade 110 on the far end of the blade platform 120 to rotate.

[0085] S5. The operator advances the thrombectomy catheter toward the thrombus, and the thrombus is cut by the blade 110 on the distal surface of the blade platform 120. Because the blade 110 on the distal surface of the blade platform 120 directly contacts and cuts the thrombus when the thrombectomy catheter is pushed, and the cut thrombus can directly enter the thrombectomy catheter through the thrombus inlet, there is no situation where the thrombus is pushed to a more distal part of the blood vessel during thrombus cutting.

[0086] When cutting soft thrombi, the blade 110 rotates at a low speed with a blade angle of 0°. At this time, the blade is completely hidden inside the side opening. The cutting force of the blade 110 on the thrombus is small. The suction force generated by the rotary cutting catheter draws the soft thrombus into the thrombus inlet. That is, the suction of the thrombus is mainly achieved by the negative pressure formed at the blade positioning port 122 by the rotary spring 140 and the transmission system of the outer tube.

[0087] When cutting hard thrombi, the blade 110 rotates at high speed, swings, and extends from the blade positioning port 122. The angle between the blade 110 and the distal face of the blade platform 120 is large, resulting in a large cutting force on the thrombus. As the centrifugal force increases, the blade angle gradually increases, reaching a maximum of 45°. At this point, the cutting edge 112 of the blade 110 is fully exposed, exhibiting the strongest cutting ability. The cutting edge 112 rotates rapidly to remove the hard thrombus.

[0088] When aspirating hard thrombi, the rotation speed of the rotating spring 140 increases, and under the action of centrifugal force, the blade angle varies between 0 and 45° (maximum 45°). When the blade swing angle is 45°, the blade protrudes the greatest height and has the strongest cutting ability.

[0089] S6. After being cut by rotary cutting, the tiny thrombus particles move with the blade to the inclined surface of the blade positioning port 122, enter the outer tube 150 along the inclined surface of the blade positioning port 122, and are output to the outside of the body along the inner lumen of the outer tube 150 under the action of the rotary spring 140.

[0090] S7. In order to better evaluate the effect of thrombus removal, the present invention performs angiography on the treated blood vessels after one complete thrombus removal to evaluate the treatment effect.

[0091] S8. If the treatment is satisfactory, the thrombectomy catheter can be withdrawn directly from the vessel along the guidewire. If there is still thrombus remaining, the thrombectomy catheter can be withdrawn to the proximal end of the thrombus, and steps S4-S7 can be repeated 2-3 times.

[0092] S9. The thrombectomy catheter is withdrawn from the blood vessel, the guidewire is removed, and the treatment is completed.

[0093] Example 2

[0094] like Figures 13 to 15 As shown, based on Embodiment 1, this embodiment discloses another implementation of a thrombus cutting catheter, and the specific structure of the blade platform 120 has been changed in this embodiment.

[0095] In this embodiment, the blade platform 120 at the far end of the outer tube 150 is fitted over the base. The blade platform 120 has at least one side opening on its side, which is connected to the inside of the outer tube 150. The side opening is arc-shaped and may be single or multiple. At least one side of the side opening is provided with a blade.

[0096] In this embodiment, the base 130 is coaxially disposed inside the blade platform 120. The base has a base side opening, which corresponds to and has the same number as the side opening of the blade platform 120.

[0097] The blade platform 120 has a tapered head to facilitate passing through the inside of the thrombus without moving it, thus avoiding the risk of distal vascular embolism.

[0098] The blade platform 120 has a top hole 121 at its distal end for the guide wire to pass through.

[0099] In this embodiment, the blade positioning port 122 and the blade 110 in Embodiment 1 can be retained at the far end of the blade platform 120, or the blade positioning port 122 and the blade 110 in Embodiment 1 can be removed.

[0100] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A thrombus-cutting catheter, characterized in that, include: The outer tube (150) has an inner thrombus delivery cavity; A blade platform (120) is rotatably disposed at the far end of the outer tube (150), and at least one blade positioning port (122) is provided on the far end surface of the blade platform (120). A delivery drive mechanism is disposed inside the outer tube (150) and connected to the blade platform (120). The delivery drive mechanism is adapted to drive the blade platform (120) to rotate and to deliver the thrombus after rotary cutting. At least one blade (110) is disposed within each of the blade positioning ports (122) and forms a thrombus inlet between the blade positioning ports (122), and is capable of adjusting the angle between the blade (110) and the distal face of the blade platform (120); the blade (110) is adapted to operate at a low speed when cutting soft thrombi, so as to be housed within the blade positioning port (122); the blade (110) is adapted to operate at a high speed when cutting hard thrombi, forming an angle between the blade (120) and the distal face of the blade platform (120) to enhance the cutting force; The blade positioning port (122) is rectangular. The inner sidewalls of the blade positioning port (122) are divided into a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall. The first sidewall and the second sidewall are arranged opposite to each other, and the third sidewall and the fourth sidewall are arranged opposite to each other. The first sidewall and the second sidewall are respectively provided with mounting holes (124) and limiting holes (125). The blade (110) includes a top plate (111) and two side plates (115), with a cutting edge (112) disposed between the two side plates (115) and the top plate (111); the two side plates (115) are respectively provided with a mounting part that rotatably fits with the mounting hole (124) and a limiting part that cooperates with the limiting hole (125), and the line connecting the two mounting parts forms the mounting shaft axis; the limiting part can move within the limiting hole (125) so that the blade (110) can be angled; The limiting part is in the shape of an arc segment; the limiting hole (125) is distributed in a spiral shape, and the radius of the limiting hole (125) decreases as the swing angle of the blade (110) increases.

2. The thrombus-cutting catheter according to claim 1, characterized in that, The blade platform (120) has a top hole (121) at the center of its distal end face for the guide wire to pass through.

3. The thrombus-cutting catheter according to claim 1, characterized in that, The third and fourth sidewalls are inclined to facilitate the flow of the cut thrombus into the outer tube (150).

4. The thrombus-cutting catheter according to claim 1, characterized in that, The blade (110) is trapezoidal in shape, with the side of the blade (110) away from the axis of the blade platform being larger and the side of the blade (110) closer to the axis of the blade platform being smaller; the center of gravity of the blade (110) is higher than the axis of the mounting shaft, so that the blade (110) tends to have a larger angle when subjected to centrifugal force.

5. The thrombus-cutting catheter according to claim 1, characterized in that, A base (130) is also provided between the outer tube (150) and the blade platform (120). The base (130) is made of metal and its outer surface is coated with DLC coating.

6. The thrombus-cutting catheter according to claim 1, characterized in that, The blade platform (120) has at least one side opening on its side, which is connected to the interior of the outer tube (150), and a blade is provided on at least one side of the side opening.

7. The thrombus-cutting catheter according to claim 1, characterized in that, The outer tube (150) is a flexible tube and can bend and change according to the curvature of the blood vessel.

8. The thrombus-cutting catheter according to claim 1, characterized in that, The delivery drive mechanism includes a rotary spring (140) and a rotary power mechanism. The rotary spring (140) and the thrombus delivery chamber constitute a delivery mechanism. One end of the rotary spring (140) is connected to the blade platform (120), and the other end of the rotary spring (140) is connected to the rotary power mechanism. The rotary spring (140) is adapted to rotate under the drive of the rotary power mechanism to drive the blade platform (120) to rotate and deliver the thrombus after rotary cutting inside the outer tube (150).

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