A rotor for a thrombus suction device

Abstract

The application discloses a rotor of a thrombus suction device, and relates to the technical field of interventional medical instruments.The rotor comprises a columnar hub and rotor blades fixed on the hub, at least two rotor blades are arranged, the rotor blades extend along or around the outer circumferential surface of the hub from the proximal end to the distal end in a spiral shape; the rotor blades are used for turbocharging of the thrombus suction device; a plurality of cutting blades are fixed on the outer circumferential surface of the distal end surface or the distal end section of the hub; the cutting blades are used for crushing thrombus clots or cutting atherosclerotic plaques; the rotor blades and the cutting blades each comprise a working surface extending outward away from the surface of the hub, a back pressure surface opposite to the working surface, and an outer profile surface intersecting the working surface and the back pressure surface.The rotor of the thrombus suction device can be applied to crushing and suction of thrombus of different sizes, improves operation efficiency, and reduces operation difficulty.

Description

Technical Field

[0001] This invention relates to the field of interventional medical device technology, and in particular to a rotor for a thrombus aspiration device. Background Technology

[0002] A thrombus is an abnormal blood clot that forms on the surface of a blood vessel's lining at a site of tearing or repair. In a variable fluid-dependent form, it consists of insoluble fibrin, deposited platelets, accumulated white blood cells, and trapped red blood cells. If a thrombus forms a blockage in a blood vessel, it will affect blood flow. If it blocks an artery, it can cause infarction in that area of ​​the body, and may even be life-threatening.

[0003] Currently, there are two main methods for treating thrombosis: thrombolytic therapy and mechanical thrombectomy. Thrombolytic therapy involves injecting antithrombotic drugs near the lesion in the affected blood vessel, creating a high concentration of thrombolytic agents at the site of the lesion. This accelerates the dissolution of the thrombus and increases the chance of vascular recanalization. However, the concentration of thrombolytic and anticoagulant drugs entering the bloodstream cannot be too high, otherwise it will produce side effects and toxicity to the body. Furthermore, due to the metabolism and excretion of the drugs in the body, thrombolytic therapy is generally suitable for smaller thrombi, and its effect is slow. For acute thrombotic diseases such as acute myocardial infarction, cerebral infarction, and acute deep vein thrombosis of the lower extremities, only mechanical thrombectomy can be used.

[0004] With the development of interventional techniques and the innovation of materials, manual thrombectomy methods have been gradually replaced by minimally invasive interventional treatments, including catheter-directed thrombolysis, catheter-directed thrombectomy, thrombectomy, and mechanical thrombectomy. Among these, thrombectomy, which uses a large-lumen catheter for aspiration, is simple to operate, quick to remove thrombi, and inexpensive, and is widely used in clinical practice. However, when using existing thrombectomy catheters to aspirate thrombi, stable thrombi may loosen and escape with the blood flow to small blood vessels, causing blockage of downstream vessels and the formation of new thrombi. For the aspiration of large thrombi, large thrombi may block the aspiration port, requiring the thrombectomy catheter to be withdrawn, treated, and reinserted, prolonging the operation time and increasing the difficulty of the operation. For subacute or old thrombi, which are tightly adhered to the blood vessel wall, ordinary aspiration may not be able to remove them, leading to surgical failure.

[0005] Therefore, there is an urgent clinical need for a device that can improve the efficiency of catheter aspiration of thrombi without being affected by the size of the thrombus, so as to improve surgical efficiency and reduce surgical difficulty. Summary of the Invention

[0006] The purpose of this invention is to provide a rotor for a thrombus aspiration device to solve the problems existing in the prior art, which can be applied to the fragmentation and aspiration of thrombi of different sizes, improve surgical efficiency, and reduce surgical difficulty.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] This invention provides a rotor for a thrombus aspiration device, comprising a cylindrical hub and rotor blades fixed on the hub, wherein at least two rotor blades are provided, and the rotor blades extend or extend in a spiral shape from the proximal end to the distal end of the hub along or around the outer circumferential surface of the hub.

[0009] The rotor blades are used for turbocharging in the thrombus aspiration device;

[0010] Several cutting blades are fixedly connected to the distal end face or the outer peripheral surface of the distal end section of the hub; the cutting blades are used to break up thrombus clots or cut atherosclerotic plaques.

[0011] Both the rotor blade and the cutting blade include a working surface extending outward away from the hub surface, a back pressure surface opposite to the working surface, and an outer profile surface intersecting the working surface and the back pressure surface.

[0012] The line connecting the two equal parts of the outer profile surface is defined as the outer edge profile; the angle through which the outer edge profile rotates around the central axis of the hub is defined as the wrap angle θ; the axial length of the outer edge profile along the hub axis is defined as L; the distance from the outer edge profile to the hub centerline is defined as s; and the slope of the outer edge profile is defined as L / (θ·s).

[0013] At least a portion of the rotor blades have an unchanged outer edge profile slope, and at least a portion of the cutting blades have an outer edge profile slope that is proportional to the distance from their outer edge profile to the hub centerline.

[0014] The present invention also provides a rotor for a thrombus aspiration device, comprising a cylindrical hub and rotor blades fixed on the hub, wherein at least two rotor blades are provided, and the rotor blades extend or extend in a spiral shape from the proximal end to the distal end of the hub along or around the outer circumference of the hub.

[0015] The rotor blades are used for turbocharging in the thrombus aspiration device;

[0016] The rotor blades extend or extend from the distal end of the hub toward the central axis of the hub to form cutting blades for breaking up thrombus clots or cutting atherosclerotic plaques; some of the cutting blades and others eventually converge on the centerline of the distal end face of the hub.

[0017] Both the rotor blade and the cutting blade include a working surface extending outward away from the hub surface, a back pressure surface opposite to the working surface, and an outer profile surface intersecting the working surface and the back pressure surface; the line connecting the two equally spaced points in the middle of the outer profile surface is defined as the outer edge profile.

[0018] The outer profile of the rotor blade is connected to the outer profile of the cutting blade; and / or, the working surface of the rotor blade is connected to the working surface of the cutting blade.

[0019] The present invention also provides a rotor for a thrombus aspiration device, comprising a cylindrical hub and rotor blades fixed on the hub, wherein at least two rotor blades are provided, and the rotor blades extend or extend in a spiral shape from the proximal end to the distal end of the hub along or around the outer circumference of the hub.

[0020] The rotor blades are used for turbocharging in the thrombus aspiration device;

[0021] The rotor blades extend or extend from the distal end of the hub toward the central axis of the hub to form cutting blades for breaking up thrombus clots or cutting atherosclerotic plaques.

[0022] Both the rotor blade and the cutting blade include a working surface extending outward away from the hub surface, a back pressure surface opposite to the working surface, and an outer profile surface intersecting the working surface and the back pressure surface; the line connecting the two equally spaced points in the middle of the outer profile surface is defined as the outer edge profile.

[0023] The outer profile of the rotor blade is connected to the outer profile of the cutting blade; and / or, the working surface of the rotor blade is connected to the working surface of the cutting blade.

[0024] In one embodiment, the line connecting the midpoints of the contact surfaces of the rotor blade and the hub is defined as the hub profile. The outer edge profile of the rotor and the hub profile have the same helix angle, and the helix angle is proportional to the axial length of the rotor blade, with the ratio k1 being between 90 and 120.

[0025] In one embodiment, the distal end face of the hub is provided with a nose cone for supporting the cutting blade; and / or, the nose cone is used for guiding free thrombus clots or atherosclerotic plaques.

[0026] In one embodiment, the nasal cone is hemispherical or a cone-shaped structure that increases in size from the distal end to the proximal end.

[0027] In one embodiment, the hub is a cylindrical structure of equal diameter; the nose cone and the hub are connected by a rounded transition, and the radius of the rounded transition is 0.2mm to 4mm.

[0028] In one embodiment, the hub is a cylindrical structure with a constant diameter; the diameter of the hub is 0.2 mm to 10 mm; when the nose cone is hemispherical, its radius is equal to the radius of the hub; when the nose cone is conical, its cone angle is between 30° and 120°.

[0029] In one embodiment, the diameter of the rotor blade is 0.5mm to 10mm, the ratio of the diameter of the hub to the diameter of the rotor blade is between 0.55 and 0.85, the axial length of the rotor blade is 1mm to 30mm, and the thickness of the rotor blade is 0.05mm to 2mm.

[0030] In one embodiment, the outer profile of the cutting blade acts on a thrombus clot or atherosclerotic plaque.

[0031] In one embodiment, a surface region that is rougher than the proximal surface of the rotor is provided on the distal end face or the outer peripheral surface of the distal end segment; the rough surface region has an uneven shape or appearance.

[0032] In one embodiment, the rough surface region is provided with spun polishing particles, which are one or a combination of ceramics, diamond, and metal.

[0033] The present invention achieves the following technical effects compared to the prior art:

[0034] The rotor of the thrombus aspiration device provided by this invention can cut and grind thrombi of different sizes through high-speed rotation, breaking the thrombus into tiny particles. This eliminates the influence of thrombus structural characteristics on thrombus aspiration, simplifies operation, and eliminates the need to remove and reinsert the thrombus aspiration catheter. Thrombus removal can be completed in one procedure, reducing surgical difficulty. The high-speed rotation of the rotor, combined with the suction force generated by the auxiliary suction catheter, enables more efficient aspiration of the fragmented thrombus, thereby shortening the intraoperative time and improving thrombus removal efficiency. The high-speed rotation of the rotor, in conjunction with the auxiliary suction catheter, can generate a pressurizing effect, which, compared to other thrombus aspiration devices that use an external suction pump, can effectively prevent catheter failure caused by arterial blood pressure compressing the suction catheter. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments 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.

[0036] Figure 1 This is a schematic diagram of the thrombus aspiration catheter device in the embodiment;

[0037] Figure 2 This is a schematic diagram of the rotor structure in the embodiment;

[0038] Figure 3 This is a schematic diagram of the rotor from another perspective in the embodiment;

[0039] Figure 4 This is a schematic diagram of the rotor outer edge profile and hub profile of the rotor in the embodiment;

[0040] Figure 5 This is a schematic diagram of the stator structure in the embodiment;

[0041] Figure 6 This is a schematic diagram of the guide outer edge profile and guide hub profile of the stator in the embodiment;

[0042] Figure 7 This is a schematic diagram showing half of the rotor protruding outside the auxiliary suction catheter in the embodiment;

[0043] Figure 8 This is a schematic diagram showing that the distal end of the rotor is flush with the distal surface of the auxiliary suction conduit in the embodiment.

[0044] Figure 9 This is a schematic diagram showing the rotor completely retracted within the auxiliary suction conduit in the embodiment;

[0045] Figure 10 This is a schematic diagram showing the positional relationship between the rotor and the stator when half of the rotor protrudes outside the auxiliary suction conduit in the embodiment.

[0046] Figure 11 This is a schematic diagram showing the positional relationship between the rotor and the stator when the distal end of the rotor is flush with the distal end face of the auxiliary suction conduit in the embodiment.

[0047] Figure 12 This is a schematic diagram showing the positional relationship between the rotor and the stator when the rotor is completely retracted into the auxiliary suction conduit in the embodiment.

[0048] Figure 13 This is a schematic diagram of the rotor blade region and the cutting blade region in the rotor of the embodiment;

[0049] Figure 14 This is a schematic diagram of the structure when the far end of the wheel hub is a plane in the embodiment;

[0050] Figure 15 This is a schematic diagram of the structure when a hemispherical nose cone is provided at the distal end of the wheel hub in the embodiment;

[0051] Figure 16 This is a schematic diagram of the structure when a tapered nose cone is provided at the distal end of the wheel hub in the embodiment;

[0052] Figure 17 This is a schematic diagram illustrating the effect of hub diameter on maximum flow rate.

[0053] Figure 18 This is a schematic diagram illustrating the effect of the spiral wrap angle on the maximum head.

[0054] Figure 19 This is a schematic diagram illustrating the effect of the cone angle on the maximum flow rate.

[0055] Figure 20 This is a schematic diagram illustrating the effect of cone angle on maximum head.

[0056] Figure 21 This is a schematic diagram illustrating the effect of the axial distance between the rotor and the stator guide structure on the maximum head.

[0057] Figure 22 This is a schematic diagram of another rotor in the embodiment;

[0058] Figure 23 for Figure 22 A partial structural cross-sectional view of the medium-rough surface C;

[0059] Figure 24 for Figure 22 A partial structural cross-sectional view of the near-end surface D of the rotor.

[0060] In the figure: 1-Auxiliary suction conduit, 2-Rotor, 3-Stator, 4-Shaft sleeve, 5-Bearing, 6-Shaft, 7-Outer circumferential surface of hub, 8-Rotor blade, 9-Cutting blade convergence part, 10-Nose cone, 11-Hub, 12-Guide hub, 13-Guide blade, 14-Rotor working surface, 15-Rotor back pressure surface, 16-Rotor inlet surface, 17-Rotor outlet surface, 18-Rotor outer profile, 19-Rotor outer edge profile, 20-Guide working surface, 21-Guide back pressure surface, 22-Guide inlet edge, 23-Guide outlet edge, 24-Guide outer profile, 25-Hub profile, 26-Guide outer edge profile, 27-Guide hub profile, A-Rotor blade area, B-Cutting blade area, C-Rough surface, D-Rotor near-end surface. Detailed Implementation

[0061] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0062] One objective of this invention is to provide a rotor for a thrombus aspiration device to address the problems existing in the prior art, enabling it to be applicable to the fragmentation and aspiration of thrombi of different sizes, thereby improving surgical efficiency and reducing surgical difficulty.

[0063] Another objective of this invention is to provide a thrombus removal catheter system to address the problems existing in the prior art. By utilizing the high-speed rotation of the distal rotor of the catheter to cut and grind thrombi or plaques while simultaneously generating suction through turbocharging, the fragmented thrombi are more efficiently aspirated, minimizing the escape of free thrombus fragments from the distal end, significantly shortening the intraoperative time, and improving thrombus removal efficiency.

[0064] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0065] Vocabulary definition or explanation:

[0066] In this invention, "wrap angle" generally refers to the angle between the inlet edge and the outlet edge of a blade in turbomachinery, and can also refer to the angle through which the outer edge profile of the blade rotates around the central axis. For clarity, specific wrap angles, such as wrap angle θ and wrap angle a, will be redefined in the context of this invention.

[0067] In this invention, "overflow" refers to the flow rate passing through the cross-section of the flow channel formed by the inner walls of the rotor blades, hub, and auxiliary suction duct. "Overflow effect" or "overflow influence" refers to the optimal range between the flow rate passing through the cross-section of the flow channel and the impeller's boost pressure. If the required flow rate and impeller boost pressure are fixed, and the flow channel shape is radially elongated, resulting in a smaller overflow area, the overflow rate will not meet design requirements, and the boost pressure will be too high. Conversely, if the flow channel shape is elongated along the rotation angle, resulting in a larger overflow area, the overflow rate will be too high, and the boost pressure will not meet design requirements.

[0068] In this invention, "helix angle" refers to the angle formed by the outer edge profile or hub profile relative to the hub axis.

[0069] In this invention, "cone angle" refers to the angle between the slope (also called inclined plane) of the cone structure and the axis of the cone structure.

[0070] In this invention, "turbocharging" refers to increasing the pressure and flow rate of a fluid by rotating a rotor; in specific embodiments, it is sometimes used in conjunction with a stator to further enhance the fluid pressure and the suction effect of the instrument.

[0071] In some specific embodiments, the present invention provides a rotor for a thrombus aspiration device, comprising a cylindrical hub and rotor blades fixed to the hub. At least two rotor blades are provided, extending or protruding spirally from the proximal end to the distal end of the hub along or around its outer circumferential surface. The rotor blades are used for turbocharging of the thrombus aspiration device. A plurality of cutting blades are fixedly connected to the distal end face or the outer circumferential surface of the distal section of the hub. The cutting blades are used to break up thrombus clots or cut atherosclerotic plaques. Both the rotor blades and the cutting blades include a working surface extending outward away from the hub surface, a back pressure surface opposite to the working surface, and an outer profile surface intersecting the working surface and the back pressure surface. Figure 13 As shown, part A is the rotor blade region, and part B is the cutting blade region. The line connecting the equally spaced points in the outer profile is defined as the outer edge profile. The angle through which the outer edge profile rotates around the hub's central axis is defined as the wrap angle θ. The axial length of the outer edge profile along the hub's axis is defined as L. The distance from the outer edge profile to the hub's central line is defined as s. The slope of the outer edge profile is defined as L / (θ·s). The slope of the outer edge profile of at least a portion of the rotor blades remains unchanged, and the slope of the outer edge profile of at least a portion of the cutting blades is proportional to the distance from their outer edge profile to the hub's central line. Traditional rotary pulverizers have a single-function rotary pulverizer rotor, and rotary pulverization and suction often cannot be performed simultaneously. Compared to the rotary pulverizer rotor of traditional rotary pulverizers, the rotor provided by this invention can achieve simultaneous rotary cutting and suction. The rotor blades and cutting blades are integrated onto the same hub, and the directional rotation of the hub can simultaneously trigger cutting and pulverization and increase fluid pressure. This is what distinguishes the rotor of this invention from traditional rotary pulverizer rotors. Cutting blades possess both a working surface and an outer profile surface, meaning they have the ability to generate rotational effects, momentum transfer, and pressure differentials similar to (or the same as) rotor blades; they also possess the capabilities of traditional rotary cutting blades. The working surface of a rotor blade (or cutting blade) refers to the part of the blade surface that directly contacts and interacts with the fluid. For rotor blades, the working surface is typically divided into two main parts: the suction surface (the side with lower pressure) and the pressure surface (the side with higher pressure). Maintaining a constant slope of the rotor blade's outer edge profile is beneficial for rotor pressurization and flow rate. The condition that the slope of the cutting blade's outer edge profile is proportional to the distance from its outer edge profile to the hub centerline is beneficial for balancing the cutting and pressurization capabilities of the cutting blade. It is understandable that if either the cutting capability or the pressurization capability of the cutting blade is too significant, it is detrimental to improving the overall pressurization effect of the rotor. Preferably, the cutting blade is designed to have a helical tendency (or helical angle tendency, or helical direction tendency) that continues or inherits from the rotor blade, which is beneficial for the pressurization effect of the cutting blade.

[0072] In some specific embodiments, the present invention provides a rotor for a thrombus aspiration device, comprising a cylindrical hub and rotor blades fixed on the hub. At least two rotor blades are provided, extending or protruding spirally from the proximal end to the distal end of the hub along or around its outer circumference. The rotor blades are used for turbocharging of the thrombus aspiration device. The rotor blades continue to extend or protrude from the distal end of the hub toward the hub's central axis to form cutting blades for breaking up thrombus clots or cutting atherosclerotic plaques. Some of the cutting blades converge with others on the centerline of the distal end face of the hub. Both the rotor blades and the cutting blades include a working surface extending outward away from the hub surface, a back pressure surface opposite to the working surface, and an outer profile surface intersecting the working surface and the back pressure surface. The line connecting the equally spaced points in the middle of the outer profile surface is defined as the outer edge profile. The outer profile surface of the rotor blades connects with the outer profile surface of the cutting blades; and / or, the working surface of the rotor blades connects with the working surface of the cutting blades. Understandably, the continuity between the rotor blades and the cutting blades is crucial; this continuity allows for sustained fluid acceleration and avoids potential energy loss due to sudden obstruction at the rotor blade inlet edge / inlet surface. Converging the cutting blades ultimately onto the centerline of the hub's far end face helps ensure stable rotor rotation during breakage, preventing rotor axis instability that could interfere with the rotor blades' power boosting.

[0073] In some specific embodiments, the present invention provides a rotor for a thrombus aspiration device, comprising a cylindrical hub and rotor blades fixed to the hub. The rotor blades are at least two in number and extend spirally from the proximal end to the distal end of the hub along or around its outer circumference. The rotor blades are used for turbocharging in the thrombus aspiration device. The rotor blades continue to extend from the distal end of the hub toward the hub's central axis to form cutting blades for breaking up thrombus clots or cutting atherosclerotic plaques. Both the rotor blades and the cutting blades include a working surface extending outward away from the hub surface, a back pressure surface opposite to the working surface, and an outer profile surface intersecting the working surface and the back pressure surface. The line connecting the equidistant points of the outer profile surface is defined as the outer edge profile. The outer profile surface of the rotor blades connects with the outer profile surface of the cutting blades; and / or, the working surface of the rotor blades connects with the working surface of the cutting blades. It is understood that the arrangement of the cutting blades converging at the center line of the distal end face of the hub is not mandatory.

[0074] In some specific embodiments, the line connecting the midpoints of the contact surfaces between the rotor blades and the hub is defined as the hub profile. The helix angles of the rotor outer edge profile and the hub profile are the same, and the helix angle is proportional to the axial length of the rotor blades, with a ratio k1 between 90 and 120. It is understandable that for turbocharging, the design of the rotor geometry also affects the rotor's turbocharging capability. A ratio k1 between 90 and 120 allows for a balance between the rotor's turbocharging effect and its flow rate effect.

[0075] In some specific embodiments, the distal end face of the hub is provided with a nose cone, which supports the cutting blades; and / or, the nose cone is used for guiding free thrombus clots or atherosclerotic plaques. The nose cone is also designed to be streamlined; on the one hand, its design aims to reduce the resistance of the distal end of the hub to the fluid and improve the fluid guiding efficiency, so as to ensure that the rotor reduces oscillation and remains stable when rotating at high speed; on the other hand, it combines with the cutting blades to form a semi-open flow channel, so that the outer profile surface of the cutting blades (or the intersection of the outer profile surface and the working surface) peels / cuts out small free thrombi from the thrombus clots. Under the promotion of the rotational effect of the semi-open flow channel, they can flow smoothly towards the proximal end of the rotor, preventing the free thrombi from escaping. This can also be understood as the semi-open flow channel providing a primary acceleration effect (primary energy conversion) for the free thrombi, causing the free thrombi to move towards the proximal end of the rotor at an accelerated pace.

[0076] In some specific embodiments, the nasal cone is hemispherical or a cone-shaped structure that increases in size from the distal to the proximal end. For example... Figure 15 As shown, a hemispherical nose cone 10 is provided at the distal end of the hub 11; as Figure 16 As shown, a tapered nose cone 10 is provided at the far end of the hub 11. Figure 14 The image shows a hub 11 with a cylindrical structure of equal diameter.

[0077] In some specific embodiments, the hub is a cylindrical structure of equal diameter; the connection between the nose cone and the hub is made by a rounded transition, with a rounded radius of 0.2mm to 4mm. This rounded transition allows for a smooth transition between the semi-open flow channel and the rotor blade segment's flow channel. Furthermore, since the rounded transition is located on the inlet side of the rotor blade (the junction of the cutting blade and the rotor blade), this smooth transition guides the fluid that has undergone primary energy conversion to the rotor blade for further energy conversion, thereby increasing fluid momentum. In other words, the rounded transition prevents the fluid in the semi-open flow channel from being thrown away from the rotor blade inlet side by centrifugal force.

[0078] In some specific embodiments, the hub is a cylindrical structure of equal diameter; the diameter of the hub is 0.2mm to 10mm; when the nose cone is hemispherical, its radius is equal to the radius of the hub; when the nose cone is conical, its cone angle is set between 30° and 120°, which can achieve an overall balance between the cutting effect and the pressurization effect of the rotor. Compared with traditional rotary grinding rotors that directly set the rotary cutting blade on the end face of the hub, it can be understood that a suitable arrangement of the cone angle of the nose cone will allow the semi-open flow channel to maintain a beneficial shape during rotor rotation; if the cone angle of the nose cone is too large or too small, it will cause the energy conversion function of the semi-open flow channel to fail.

[0079] In some specific embodiments, the diameter of the rotor blade is 0.5mm to 10mm, the ratio of the diameter of the hub to the diameter of the rotor blade is between 0.55 and 0.85, the axial length of the rotor blade is 1mm to 30mm, and the thickness of the rotor blade is 0.05mm to 2mm.

[0080] In some specific embodiments, the outer profile of the cutting blade acts on thrombus clots or atherosclerotic plaques.

[0081] In some specific embodiments, the present invention provides a thrombus removal catheter system, including an auxiliary aspiration catheter and a turbocharger assembly. The turbocharger assembly includes a rotor and a rotating shaft fixedly connected to the rotor. The rotating shaft is used to transmit torque for driving the rotor to rotate. The rotor is disposed on the distal side of the auxiliary aspiration catheter and is retractable into the lumen of the distal segment of the auxiliary aspiration catheter. And / or, at least a portion of the rotor extends beyond the distal lumen of the auxiliary aspiration catheter. The rotor includes a cylindrical hub and rotor blades fixed on the hub. The rotor blades are provided with at least two blades, which extend or extend helically from the proximal end to the distal end of the hub along or around the outer circumference of the hub. The rotor blades are used to cooperate with the auxiliary aspiration catheter to achieve turbocharging within the lumen of the distal segment of the auxiliary aspiration catheter. The rotor blades include a working surface extending outward away from the surface of the hub. The rotor blades continue to extend or extend from the distal end of the hub toward the central axis of the hub to form cutting blades for breaking up thrombus clots or cutting atherosclerotic plaques. This thrombectomy catheter system utilizes a high-speed rotating, abrasive rotor at the distal end of an auxiliary aspiration catheter to generate suction, enabling more efficient aspiration of fragmented thrombi, thus shortening intraoperative time and improving thrombectomy efficiency. A rotating shaft connects to the external drive source, transmitting torque to allow the rotor in the turbocharger assembly to rotate at high speed. The auxiliary aspiration catheter is fitted around the rotor connected to the shaft, and the rotor and auxiliary aspiration catheter are axially movable. When used for thrombectomy in a patient, the auxiliary aspiration catheter is inserted into the target blood vessel lumen using the Seldinger technique, and then the rotor connected to the shaft is pushed through the auxiliary aspiration catheter lumen to the distal end of the auxiliary aspiration catheter (or it can be inserted simultaneously with the auxiliary aspiration catheter). The operator selects and activates the drive source to rotate the rotor as needed. The operator can choose to push the rotor until it extends completely from the distal end of the auxiliary aspiration catheter, or to position the rotor at the distal end of the auxiliary aspiration catheter, allowing the tapered section with cutting blades to extend from the distal end of the catheter and interact with the thrombus (atherosclerotic plaque). When the rotor blades are within the lumen of the auxiliary aspiration catheter, the rotor and the auxiliary aspiration catheter constitute a turbocharging system. When the rotor blades are within the lumen of the auxiliary aspiration catheter and the cutting blades are outside the distal end of the catheter, the rotor and the auxiliary aspiration catheter constitute a thrombus removal catheter system with thrombus fragmentation and aspiration capabilities. It can be understood that by setting continuous blades with different axial functional zones on the same hub (also called multi-functional integrated blades), thrombus fragmentation and turbocharging aspiration can be performed simultaneously, enabling the thrombus removal catheter system to be configured with functional synergy (cooperation), significantly improving thrombectomy efficiency compared to traditional single-function rotational atherectomy devices. The use of multi-functional integrated blades allows the flow channels between the rotor blades to be helically continuous, thus enabling the turbocharging component to achieve multi-stage energy conversion (rotational effect).

[0082] In some specific embodiments, the present invention provides a thrombus removal catheter system, including an auxiliary aspiration catheter and a turbocharger assembly. The turbocharger assembly includes a rotor and a rotating shaft fixedly connected to the rotor. The rotating shaft is used to transmit torque for driving the rotor to rotate. The rotor is disposed on the distal side of the auxiliary aspiration catheter and is retractable into the lumen of the distal segment of the auxiliary aspiration catheter. And / or, at least a portion of the rotor extends beyond the distal lumen of the auxiliary aspiration catheter. The rotor includes a cylindrical hub and rotor blades fixed on the hub. The rotor blades are provided with at least two blades, which extend or extend spirally from the proximal end to the distal end of the hub along or around the outer circumferential surface of the hub. The rotor blades are used to cooperate with the auxiliary aspiration catheter to achieve turbocharging within the lumen of the distal segment of the auxiliary aspiration catheter. The rotor blades include a working surface extending outward away from the surface of the hub. A plurality of cutting blades are fixedly connected to the distal surface of the hub or the outer circumferential surface of the distal segment. The cutting blades are used to break up thrombus clots or cut atherosclerotic plaques. Compared to external suction pumps, this thrombus removal catheter system effectively prevents catheter failure caused by arterial blood pressure compressing the suction catheter.

[0083] like Figure 7 As shown, half of the rotor 2 protrudes outside the auxiliary suction conduit 1; as Figure 8 As shown, the distal end of rotor 2 is flush with the distal surface of auxiliary suction conduit 1; as Figure 9 As shown, rotor 2 is completely contained within auxiliary suction conduit 1.

[0084] In some specific embodiments, the turbocharger assembly further includes a stator capable of axial movement within the cavity of the auxiliary aspiration catheter; the stator is able to remain in a non-rotating state relative to the rotating rotor; the stator includes a guide hub and guide vanes fixed to the surface of the guide hub, the guide vanes having a guide working surface with a rotation direction opposite to that of the rotor blades; the stator is used for energy conversion. In some thrombus removal catheter systems, it is further considered to add a module that can further increase the fluid pressure at the proximal end of the rotor to improve the system's aspiration capacity. A stator generally refers to the stationary part in a rotating mechanical device, which is opposite to the rotor. The stator in the turbocharger assembly of the present invention has a guide working surface with a rotation direction opposite to that of the rotor blades, which allows the fluid that is originally detached from the rotor working surface to further convert a portion of the fluid's kinetic energy into pressure energy through the reverse guide surface of the stator.

[0085] like Figure 10 As shown, the rotor 2 is partially exposed outside the auxiliary suction conduit 1, and its position relative to the stator 3 is as follows; Figure 11 As shown, the positional relationship between the rotor 2 and the stator 3 when the distal end of the rotor 2 is flush with the distal end face of the auxiliary suction conduit 1; as shown... Figure 12As shown, the positional relationship between the rotor 2 and the stator 3 when the rotor 2 is completely retracted into the auxiliary suction conduit 1.

[0086] In some specific embodiments, at least two guide vanes are provided, the stator is coaxially disposed near the near end of the rotor, and the axial distance between the rotor and the stator is between 0.1 mm and 15.0 mm.

[0087] In some specific embodiments, the radius of the guide vane is 0.5mm to 10mm, which is greater than the maximum radius of the rotor by 0.05mm to 3mm; the axial length of the guide vane is between 1.0mm and 30mm.

[0088] In some specific embodiments, the guide hub is a cylindrical body with a distal end face and a proximal end face; the guide working surface has a guide inlet edge near the distal end face of the guide hub and a guide outlet edge near the proximal end face of the guide hub; the guide inlet edge and the guide outlet edge are defined as follows: when the guide inlet edge and the guide outlet edge are projected axially onto the same plane, the included angle between the guide inlet edge and the guide outlet edge is defined as the wrap angle α; the wrap angle α is between 0° and 60°, and the ratio k2 of the wrap angle α to the axial length of the guide hub is between 5 and 15.

[0089] In some specific embodiments, the distal end face of the hub is provided with a nose cone, which is used to support the cutting blade; and / or, in a turbocharger assembly, for balancing the cutting capability, boosting capability and flow capability; or, in a turbocharger assembly, for balancing the cutting action, boosting action and flow action.

[0090] In some specific embodiments, the diameter of the hub is 0.4mm to 1.8mm; when the nose cone is hemispherical, its radius is equal to the radius of the hub; when the nose cone is a conical structure, its cone angle is between 30° and 120°.

[0091] In some specific embodiments, the cutting blade includes a working surface extending outward away from the hub surface and an outer profile surface away from the hub surface and intersecting with the working surface; the working surface of the cutting blade has at least some of the capabilities or functions of the working surface of the rotor blade; the outer profile surface of the cutting blade acts on thrombus clots or atherosclerotic plaques.

[0092] In some specific embodiments, the rotating rotor can simultaneously achieve plug breaking and turbocharging.

[0093] In some preferred embodiments: such as Figures 1-4As shown, this embodiment provides a rotor 2 for a thrombus aspiration device, including a hub 11 and helical rotor blades 8 fixed on the outer peripheral surface 7 of the hub. The rotor blades 8 are provided in at least two pieces, evenly distributed on the outer peripheral surface 7 of the hub, and intersect at the distal end of the hub 11 to form a cutting blade convergence part 9. The distal end face of the hub 11 is provided with a nose cone 10, which is a hemispherical or a cone structure that gradually increases from the distal end to the proximal end. The hub 11 is a cylindrical structure with equal diameter.

[0094] The rotor blade 8 includes a rotor working surface 14, a rotor back pressure surface 15, a rotor inlet surface 16, a rotor outlet surface 17, and a rotor outer profile surface 18. The line connecting the two equally spaced points in the rotor outer profile surface 18 forms the rotor outer edge profile 19. The line connecting the two equally spaced points in the contact surface between the rotor blade 8 and the outer circumferential surface 7 of the hub forms the hub profile 25. The rotor outer edge profile 19 and the hub profile 25 have the same helix angle, and the helix angle is proportional to the axial length of the rotor blade 8. The ratio k1 is between 90 and 120, and k1 is preferably 99.5, which can ensure the pressure boosting effect and flow rate of the rotor 2. When the k1 value is too small (less than 90), the pressure boosting effect of the rotor 2 will be worse; when the k1 value is too large (greater than 120), the flow rate of the rotor 2 will be worse.

[0095] The high-speed rotation of rotor 2 can cut and grind thrombi of different sizes, breaking them down into tiny particles. This eliminates the influence of thrombus structure on thrombus aspiration, simplifying the operation. It eliminates the need to remove the aspiration catheter and reinsert it, allowing for complete thrombus removal in a single procedure and reducing surgical difficulty. The high-speed rotation of rotor 2, combined with the suction generated by auxiliary aspiration catheter 1, enables more efficient aspiration of the fragmented thrombi, shortening the procedure time and improving thrombus removal efficiency. Furthermore, the high-speed rotation of rotor 2, working in conjunction with auxiliary aspiration catheter 1, generates a pressurizing effect. Compared to other thrombus aspiration devices that use external aspiration pumps, this effectively prevents catheter failure caused by arterial blood pressure compressing the aspiration catheter.

[0096] The nasal cone 10 and the hub 11 are connected by a rounded transition, with a rounded radius of 0.2mm to 1.8mm. The rounded transition facilitates the aspiration of thrombi through the rotor 2 and also makes the injection molding process of the rotor 2 easier.

[0097] The diameter of the hub 11 is 0.4mm to 1.8mm. When the nose cone 10 is hemispherical, its radius is equal to the radius of the hub 11. When the nose cone 10 is conical, its cone angle is between 30° and 120°, preferably 45°, which can ensure the cutting effect of the rotor 2 on the thrombus, while ensuring the pressurization and flow rate of the rotor 2. When the cone angle is too small (less than 30°), the cutting effect of the rotor 2 on the thrombus will be worse. When the cone angle is too small, the pressurization and flow rate of the rotor 2 will be worse.

[0098] The diameter of the rotor blade 8 is 1.0mm to 3.3mm, and the ratio of the diameter of the hub 11 to the diameter of the rotor blade 8 is between 0.55 and 0.85, which makes the suction head and suction volume of the thrombus aspiration device in a relatively high range. The axial length of the rotor blade 8 is 2mm to 6mm.

[0099] The outer surfaces of the rotor blades 8 are rounded at the intersections with the rotor working surface 14 and the rotor back pressure surface 15, with each rounded corner having a radius of 0.02mm to 0.04mm. The intersections of the rotor working surface 14 and the rotor back pressure surface 15 with the rotor inlet surface 16 are also rounded, with each rounded corner having a radius of 0.02mm to 0.04mm. The intersections of the hub with the rotor working surface 14, the rotor back pressure surface 15, the rotor inlet surface 16, and the rotor outlet surface 17 are also rounded, with each rounded corner having a radius of 0.02mm to 0.04mm. These rounded corner transitions facilitate the smooth passage of thrombus aspiration through the rotor and also simplify the rotor's injection molding process. The thickness of the rotor blade 8 is 0.08mm to 0.15mm, and the number of rotor blades 8 is 2-6, preferably 4, which can ensure the pressure boosting effect and flow rate effect of the rotor 2. If the number of blades is too small (less than 2), the pressure boosting effect of the blades will be worse, and if the number of blades is too large (more than 6), the flow rate effect of the blades will be worse.

[0100] In some preferred embodiments: such as Figures 1-6 As shown, this embodiment provides a thrombus removal catheter system, including an auxiliary aspiration catheter 1, a rotor 2, and a stent 3. The rotor 2 is the rotor described in the above embodiment. The rotor 2 is located at the distal end of the auxiliary aspiration catheter 1 and can retract into the auxiliary aspiration catheter 1. After the rotor 2 retracts into the auxiliary aspiration catheter 1, it is in clearance fit with the auxiliary aspiration catheter 1. The stent 3 is located in the distal port of the auxiliary aspiration catheter 1. The auxiliary aspiration catheter 1 is provided with a rotating sleeve 4. The distal end of the rotating sleeve 4 is sealed by a bearing 5. A rotating shaft 6 is rotatably connected inside the rotating sleeve 4. The distal end of the rotating shaft 6 passes through the bearing 5 and is connected to the rotor 2. The rotation of the rotating shaft 6 drives the rotor 2 to rotate and break up the thrombus. The stent 3 is fixed on the rotating sleeve 4.

[0101] The stator 3 includes a guide hub 12 and spiral guide vanes 13 disposed on the guide hub 12. There are at least two guide vanes 13, which are evenly distributed on the guide hub 12. The direction of rotation of the guide vanes 13 is opposite to that of the rotor vanes 8, so that the thrombus aspiration catheter device can have a greater aspiration head.

[0102] During use, the high-speed rotation of the rotor 2 at the distal end of the auxiliary aspiration catheter 1 cuts and grinds thrombi of different sizes, breaking them into tiny particles. This eliminates the influence of thrombus structural characteristics on thrombus aspiration, making the operation simple. There is no need to remove the thrombus aspiration catheter and reinsert it into the body; thrombus aspiration can be completed in one session. Through the auxiliary aspiration catheter 1 and the stent 3, the high-speed rotation of the distal rotor 2 generates suction, enabling more efficient aspiration of the fragmented thrombi, thereby shortening the intraoperative time and improving thrombectomy efficiency. The high-speed rotation of the distal rotor 2, in conjunction with the auxiliary aspiration catheter 1 and the stent 3, generates a pressurizing effect. Compared to other thrombus aspiration devices that use an external aspiration pump, this effectively prevents catheter failure caused by arterial blood pressure compressing the aspiration catheter.

[0103] In this embodiment, the fitting clearance f between the rotor 2 and the auxiliary suction conduit 1 satisfies 0.05mm≤f≤4mm.

[0104] In this embodiment, the rotor 2 and the stator 3 are arranged on the same axis, and the axial distance between the rotor 2 and the stator 3 is between 0.1mm and 10.0mm. Different distance values ​​can be set according to actual needs.

[0105] In this embodiment, the outer diameter of the stator 3 is equal to the maximum diameter of the rotor 2. The radius of the guide vane 13 is 0.5mm to 1.7mm, which is 0.05mm to 0.2mm larger than the maximum radius of the rotor 2. The axial length of the guide vane 13 is between 1.0mm and 4mm, preferably 3mm. If the axial length of the guide vane 13 is too short, the motion stability of the entire suction device will deteriorate. If the axial length of the guide vane 13 is too long, the flow effect of the entire suction device will deteriorate. The guide hub 12 is a cylinder of equal diameter. A circular through hole is provided in the middle of the cylinder of equal diameter for fitting and fixing on the rotating shaft sleeve 4. The diameter of the circular through hole is 0.5mm to 1.5mm.

[0106] In this embodiment, the guide vane 13 includes a guide working surface 20, a guide back pressure surface 21, a guide inlet edge 22, a guide outlet edge 23, and a guide profile surface 24. The line connecting the two equally spaced points in the middle of the guide profile surface 24 is the guide outer edge profile 26. The line connecting the two equally spaced points in the middle of the contact surfaces between the guide vane 13 and the guide hub 12 is the guide hub profile 27. The guide outer edge profile and the guide hub profile have the same wrap angle. The guide inlet edge 22 and the guide outlet edge 23 are projected axially onto the same plane. The angle formed by the guide inlet edge 22 and the guide outlet edge 23 is the wrap angle α. The wrap angle α is between 0° and 60°. When the wrap angle is too large (greater than 60°), the flow effect of the vane will be worse. The ratio of the wrap angle to the axial length of the hub, k2, is between 5 and 15.

[0107] In this embodiment, in the stator 3, the outer surface of the guide vane 13 intersects with the guide working surface 20 and the guide back pressure surface 21 at rounded corners, the guide working surface 20 and the guide back pressure surface 21 intersect with the guide inlet edge 22 at rounded corners, and the guide working surface 20 and the guide back pressure surface 21 intersect with the guide outlet edge 23 at rounded corners, with each rounded corner radius being 0.01mm to 0.1mm; the guide hub 12 intersects with the guide working surface 20, the guide back pressure surface 21, the guide inlet edge 22, and the guide outlet edge 23 at rounded corners, with each rounded corner radius being 0.01mm to 0.05mm. The rounded corner transition facilitates the aspiration of thrombi and their smooth passage through the rotor, and also facilitates the injection molding process of the stator 3; the thickness of the guide vane 13 is 0.1mm to 0.15mm, and the number of guide vanes 13 is 3-5.

[0108] The rotor comprises a conical section at the front end for cutting thrombus fragments and a pressurizing section at the rear end for suction. The middle section transitions with rounded corners. The hub of the conical section is hemispherical or a tapered structure that gradually increases in size from distal to proximal, while the hub of the pressurizing section is a cylindrical structure of constant diameter. The rotor blades are at least two helical continuous blades; the outer diameter of the blades in the conical section gradually increases as the axial direction changes from the head to the middle transition section, a shape that facilitates the cutting of thrombus fragments. This increasing trend can be linear, parabolic, or arc-shaped, until it reaches the same outer diameter as the impeller of the pressurizing section.

[0109] Through extensive and in-depth research, the applicant has creatively proposed a geometric parameter design scheme for the turbocharger assembly, specifically for application scenarios. For example, under CFD simulation conditions of 12000 rpm and full flow field, the diameter of the hub 11 of rotor 2 is 0.7 mm, 0.9 mm, and 1.1 mm, respectively; the cone angle of the nose cone 10 is 45°, 52.5°, and 60°, respectively; the outer diameter of rotor blade 8 is 1.4 mm, the height is 2.5 mm, and the ratio k1 between the rotation angle of rotor outer edge profile 19 and the axial length of rotor blade 8 is 45.2 (wrapping angle 113°), 67, and 113°, respectively. .6 (wrap angle 169°), 90 (wrap angle 225°), 112.4 (wrap angle 281°), and 337.5 (wrap angle 135°), rotor blade 8 thickness 0.1mm, number of blades 4, stator 3 guide hub 12 diameter 1.5mm, guide hub 12 center diameter 1.4mm, guide blade 13 outer diameter 2.3mm, height 2.5mm, wrap angle 45°, all fillet radii 0.1mm, distance between rotor 2 and stator 3 0.5mm. Through calculation of 3*3*5, a total of 45 schemes, the following results were obtained: Figures 17-21The results, as shown in the figure, indicate that within the range of 45° to 60°, a cone angle of 45° (leaning towards a smaller value), a hub diameter of 0.9mm (leaning towards a larger value), and a k1 value of 112.4 (wrapping angle 281°) are the most suitable design scheme. This achieves a head of 25mm water column and a flow rate of 3mL / min, meeting the design requirements. Figure 17 This is a schematic diagram illustrating the effect of hub diameter on maximum flow rate. Figure 18 This is a schematic diagram illustrating the effect of the spiral wrap angle on the maximum head. Figure 19 This is a schematic diagram illustrating the effect of the cone angle on the maximum flow rate. Figure 20 This is a schematic diagram illustrating the effect of cone angle on maximum head. Figure 21 This is a schematic diagram showing the effect of the axial distance between the rotor and the stator guide structure on the maximum head.

[0110] The effect of the axial distance between the rotor and stator on the maximum head of a thrombus aspiration device or thrombus removal catheter system: From Figure 21 As can be seen, as the axial distance between the rotor and the stator that provides support gradually increases, the maximum head of the thrombus aspiration device gradually decreases, and the aspiration capacity gradually deteriorates.

[0111] In some specific embodiments, the present invention also provides a thrombus aspiration device or thrombus removal catheter system capable of handling (tough and hard) subacute thrombi: such as Figures 22-24 As shown, a surface region C, which is rougher than the near-end surface of the rotor, is deployed on the distal end face or the outer circumferential surface of the distal end segment; the rough surface region C has an uneven shape or appearance (e.g., Figure 23 The C in the text has particles that are raised relative to the basal surface; such as... Figure 24 The proximal surface D of the rotor is relatively smooth as it lacks protruding particles. The rough surface region contains protruding particles, which may be one or a combination of ceramic, diamond, or metal. Subacute thrombi can be removed by rotary abrasion using this rotor with a distally rough surface. The rough surface region C can be located on the outer profile surface of the cutting blades or on the cutting blade convergence portion 9, or on a curved surface formed by the axial extension of the cutting blade convergence portion 9 distally. The outer profile surface of the rotor blades is free of particles found in the rough surface region. Typically, as... Figure 22 As shown, the rough surface region C is deployed within the cutting blade region B, while the rotor blade region A does not have the rough surface region C.

[0112] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A rotor for a thrombus aspiration device, characterized in that: It includes a cylindrical hub and rotor blades fixed on the hub. The rotor blades are provided with at least two blades. The rotor blades extend or extend in a spiral shape from the near end to the far end of the hub along or around the outer circumference of the hub. The rotor blades are used for turbocharging in the thrombus aspiration device; Several cutting blades are fixedly connected to the distal end face or the outer peripheral surface of the distal end section of the hub; the cutting blades are used to break up thrombus clots or cut atherosclerotic plaques. Both the rotor blade and the cutting blade include a working surface extending outward away from the hub surface, a back pressure surface opposite to the working surface, and an outer profile surface intersecting the working surface and the back pressure surface. The line connecting the two equal parts of the outer profile surface is defined as the outer edge profile; the angle through which the outer edge profile rotates around the central axis of the hub is defined as the wrap angle θ; the axial length of the outer edge profile along the hub axis is defined as L; the distance from the outer edge profile to the hub centerline is defined as s; and the slope of the outer edge profile is defined as L / (θ·s). At least a portion of the rotor blades have an unchanged outer edge profile slope, and at least a portion of the cutting blades have an outer edge profile slope that is proportional to the distance from their outer edge profile to the hub centerline.

2. A rotor for a thrombus aspiration device, characterized in that: It includes a cylindrical hub and rotor blades fixed on the hub. The rotor blades are provided with at least two blades. The rotor blades extend or extend in a spiral shape from the near end to the far end of the hub along or around the outer circumference of the hub. The rotor blades are used for turbocharging in the thrombus aspiration device; The rotor blades extend or extend from the distal end of the hub toward the central axis of the hub to form cutting blades for breaking up thrombus clots or cutting atherosclerotic plaques; some of the cutting blades and others eventually converge on the centerline of the distal end face of the hub. Both the rotor blade and the cutting blade include a working surface extending outward away from the hub surface, a back pressure surface opposite to the working surface, and an outer profile surface intersecting the working surface and the back pressure surface; the line connecting the two equally spaced points in the middle of the outer profile surface is defined as the outer edge profile. The outer profile of the rotor blade is connected to the outer profile of the cutting blade; and / or, the working surface of the rotor blade is connected to the working surface of the cutting blade.

3. A rotor for a thrombus aspiration device, characterized in that: It includes a cylindrical hub and rotor blades fixed on the hub. The rotor blades are provided with at least two blades. The rotor blades extend or extend in a spiral shape from the near end to the far end of the hub along or around the outer circumference of the hub. The rotor blades are used for turbocharging in the thrombus aspiration device; The rotor blades extend or extend from the distal end of the hub toward the central axis of the hub to form cutting blades for breaking up thrombus clots or cutting atherosclerotic plaques. Both the rotor blade and the cutting blade include a working surface extending outward away from the hub surface, a back pressure surface opposite to the working surface, and an outer profile surface intersecting the working surface and the back pressure surface; the line connecting the two equally spaced points in the middle of the outer profile surface is defined as the outer edge profile. The outer profile of the rotor blade is connected to the outer profile of the cutting blade; and / or, the working surface of the rotor blade is connected to the working surface of the cutting blade.

4. The rotor of the thrombus aspiration device according to any one of claims 1 to 3, characterized in that: The line connecting the midpoints of the contact surfaces between the rotor blade and the hub is defined as the hub profile. The outer edge profile of the rotor and the hub profile have the same helix angle, and the helix angle is proportional to the axial length of the rotor blade, with the ratio k1 being between 90 and 120.

5. The rotor of the thrombus aspiration device according to any one of claims 1 to 3, characterized in that: The distal end face of the hub is provided with a nose cone, which is used to support the cutting blade; and / or, the nose cone is used to guide free thrombus clots or atherosclerotic plaques.

6. The rotor of the thrombus aspiration device according to claim 5, characterized in that: The nasal cone is a hemispherical or cone-shaped structure that increases in size from the distal end to the proximal end.

7. The rotor of the thrombus aspiration device according to claim 6, characterized in that: The hub is a cylindrical structure of equal diameter; the nose cone and the hub are connected by a rounded corner transition, with the rounded corner radius of the transition part being 0.2mm to 4mm.

8. The rotor of the thrombus aspiration device according to claim 6, characterized in that: The hub is a cylindrical structure with a constant diameter; the diameter of the hub is 0.2mm to 10mm; when the nose cone is hemispherical, its radius is equal to the radius of the hub; when the nose cone is conical, its cone angle is between 30° and 120°.

9. The rotor of the thrombus aspiration device according to any one of claims 1 to 3, characterized in that: The diameter of the rotor blade is 0.5mm to 10mm, the ratio of the diameter of the hub to the diameter of the rotor blade is between 0.55 and 0.85, the axial length of the rotor blade is 1mm to 30mm, and the thickness of the rotor blade is 0.05mm to 2mm.

10. The rotor of the thrombus aspiration device according to any one of claims 1 to 3, characterized in that: The outer profile of the cutting blade acts on thrombus clots or atherosclerotic plaques.

11. The rotor of the thrombus aspiration device according to any one of claims 1 to 3, characterized in that: The rotor has a surface region that is rougher than the rotor's proximal surface on its distal end face or the outer circumferential surface of the distal end segment; the rough surface region has an uneven shape or appearance.

12. The rotor of the thrombus aspiration device according to claim 11, characterized in that: The rough surface region is provided with spun grinding particles, which are one or a combination of ceramics, diamond, and metal.

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