Rotator for intravascular clot retrieval system

Abstract

The application discloses a rotating body of an intravascular coagulation removal system and relates to the technical field of medical devices, which comprises a rotating body, a plurality of openings or channels are arranged on the rotating body, the rotating body can break the coagulation in the blood vessel when rotating, and the coagulation on the distal side of the rotating body is drawn to the proximal side of the rotating body through the effect of the openings or the channels to generate vortex flow.

Description

[0001] This application is a divisional application of the parent patent entitled "Intravascular Clot Removal System and Rotating Body of Intravascular Clot Removal System"; the application number of the parent application is: CN202311459103.X; the application date of the parent application is: 2023.11.03. Technical Field

[0002] This invention relates to the field of medical device technology, and in particular to a rotating body of an intravascular clot removal system. Background Technology

[0003] Stroke is classified into ischemic stroke and hemorrhagic stroke. In patients with ischemic stroke, intracranial large vessel occlusion caused by various factors has always been a challenge in treatment. Current treatment methods include intravenous thrombolysis, intra-arterial thrombolysis, endovascular mechanical thrombectomy, and combinations of these methods. Intravenous and arterial thrombolysis are routine methods for treating acute ischemic stroke, but these methods have high requirements for the treatment time window, many limitations on drugs, and low recanalization rates for acute ischemic stroke caused by large vessel occlusion. Mechanical thrombectomy devices have gained widespread attention due to their numerous advantages: rapid recanalization, lower hemorrhagic transformation rate, and extended stroke intervention time window. They have shown satisfactory clinical results for recanalization in acute ischemic stroke caused by large vessel occlusion. However, current mechanical thrombectomy devices only use a single negative pressure source to aspirate thrombi, which is not very effective. Therefore, it is necessary to design a device with better thrombectomy results to remove thrombi and other blockages from blood vessels. Summary of the Invention

[0004] The purpose of this invention is to provide a rotating body for an intravascular clot removal system to solve the problems existing in the prior art, which can break up and remove clots in blood vessels with good clot removal effect.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] The present invention provides a rotating body for an intravascular clot removal system, comprising a rotating body having a plurality of openings or channels. When the rotating body rotates, it can break up clots in the blood vessels and generate eddies through the openings or channels, drawing the clots on the distal side of the rotating body toward the proximal side of the rotating body.

[0007] Preferably, the rotating body includes a first section that generates eddies by rotation and a second section that breaks up blockages by rotation. The second section is fixed to the distal end of the first section. The outer side of the first section is provided with a plurality of openings or channels. The outer peripheral surface or distal end surface of the second section is provided with a plurality of protruding members for breaking up blockages during rotation.

[0008] Preferably, each of the openings is uniformly arranged circumferentially on the outer peripheral surface of the first segment, and each of the channels is uniformly arranged circumferentially within the first segment.

[0009] Preferably, the opening or the channel also serves to guide fluid flow.

[0010] The present invention achieves the following technical effects compared to the prior art:

[0011] The rotating body of the intravascular clot removal system provided by the present invention can break up clots in blood vessels when the rotating body rotates, and generate vortexes through the action of openings or channels to draw clots on the distal side of the rotating body to the proximal side of the rotating body. While breaking up the clots, the suction effect of the vortex is used to extract them, thereby improving the clot removal effect. Attached Figure Description

[0012] 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.

[0013] Figure 1 This is a schematic diagram of the intravascular clot removal system in Example 1;

[0014] Figure 2 This is a schematic diagram of the blockage removal process in Example 1;

[0015] Figure 3 for Figure 1 Schematic diagram of AA section in the middle;

[0016] Figure 4 for Figure 1 Schematic diagram of the BB cross section in the middle;

[0017] Figure 5 This is a schematic diagram of the structural connection between the flexible drive shaft and the rotating body in Example 1;

[0018] Figure 6 This is a side view of the rotating body in Example 2;

[0019] Figure 7 This is a three-dimensional structural diagram of the rotating body in Example 2;

[0020] Figure 8 This is a schematic diagram of one structure of the protruding component in this invention;

[0021] Figure 9This is a schematic diagram of another structure of the protruding component in this invention;

[0022] Figure 10 This is a schematic diagram of another structure of the protruding component in this invention;

[0023] Figure 11 This is a schematic diagram of another structure of the protruding component in this invention;

[0024] Figure 12 This is a schematic diagram of the limiting unit in Example 3;

[0025] Figure 13 This is a schematic diagram showing the structural connection between the flexible drive shaft, the limiting unit, and the rotating body in Example 3;

[0026] Figure 14 This is a schematic diagram of the flexible drive shaft being supported inside the suction conduit by a limiting unit in Example 3;

[0027] Figure 15 This is a schematic diagram of the intravascular clot removal system in Example 4;

[0028] Figure 16 This is an axial schematic diagram of the intravascular clot removal system in Example 4;

[0029] Figure 17 This is a schematic diagram showing the positional relationship between the flexible drive shaft and the suction tube when the protective sleeve is removed in Example 4;

[0030] Figure 18 This is an exploded view of the intravascular clot removal system in Example 4;

[0031] Figure 19 This is a schematic diagram of the connection structure between the flexible drive shaft and the motor module in Example 4;

[0032] Figure 20 This is a three-dimensional structural diagram of the rotating body of the intravascular clot removal system in this invention;

[0033] Figure 21 for Figure 20 A frontal view of the rotating body of the intravascular clot removal system;

[0034] Figure 22 for Figure 20 A schematic diagram of the structural connection between the rotating body and the flexible drive shaft of the intravascular clot removal system. Detailed Implementation

[0035] Definition: "Forward rotation" means clockwise or counterclockwise rotation.

[0036] This invention provides an intravascular clot removal system, including an aspiration catheter. The proximal section of the aspiration catheter can be connected to a negative pressure source for aspirating clots within the aspiration catheter. The distal end has a fluid inlet. A flexible drive shaft is provided inside the aspiration catheter. A rotating body is coaxially fixedly connected to the distal end of the flexible drive shaft. The proximal end of the flexible drive shaft can be connected to a rotation actuator. The distal end of the flexible drive shaft near the rotating body is radially limited within the aspiration catheter by a limiting unit. The rotating body has several openings or channels. The flexible drive shaft causes the rotating body to rotate forward within the aspiration catheter. When the rotating body rotates, the openings or channels at the distal end generate vortices, drawing clots outside the aspiration catheter into the aspiration catheter.

[0037] As an embodiment of the present invention, the rotating body is capable of moving along the axial direction of the aspiration catheter, and the distal end of the rotating body moves out of the aspiration catheter and then rotates in the opposite direction to break up the clots in the blood vessel.

[0038] As an embodiment of the present invention, the gap f between the outer diameter of the rotating body and the inner diameter of the aspiration catheter satisfies 0.1mm≤f≤5mm, and the outer diameter of the rotating body is greater than or equal to the outer diameter of the flexible drive shaft.

[0039] As an embodiment of the present invention, the gap f between the outer diameter of the rotating body and the inner diameter of the aspiration catheter satisfies 0.1mm≤f≤3mm, and the outer diameter of the rotating body is greater than or equal to the outer diameter of the flexible drive shaft.

[0040] As an embodiment of the present invention, the rotating body rotates within the suction catheter at a speed of 500 to 30000 rpm to generate eddies, causing the clotted material to move through the opening and / or the gap between the rotating body and the suction catheter to one side of the proximal end of the rotating body, or causing the clotted material to move through the channel and / or the gap between the rotating body and the suction catheter to one side of the proximal end of the rotating body.

[0041] As an embodiment of the present invention, the rotating body rotates outside the suction catheter at a speed of 0 to 500 rpm, and the distal end of the rotating body breaks up the clotted material.

[0042] As an embodiment of the present invention, the opening or channel also serves to guide fluid flow. For example, it guides fluid located at the distal fluid inlet of the suction conduit through the rotating body or moves it to the proximal region of the rotating body. The fluid flow guiding effect of the opening or channel will further enhance the attraction or suction capacity of the vortex on the blockage.

[0043] As an embodiment of the present invention, a protective sleeve is also included. The protective sleeve is sleeved outside the flexible drive shaft. A gap is provided between the distal end of the protective sleeve and the proximal end of the rotating body. The proximal end of the protective sleeve is provided with an injection port for guiding liquid to flow into the gap between the flexible drive shaft and the protective sleeve.

[0044] As an embodiment of the present invention, the limiting unit is disposed on the distal section of the protective sleeve or on the distal section of the flexible drive shaft, and a fitting gap is provided between the outer side of the limiting unit and the inner wall of the suction catheter.

[0045] Preferably, the fitting clearance between the outer surface of the limiting unit and the inner wall of the suction conduit is 0.01 mm ≤ fitting clearance ≤ 4 mm. The fitting clearance between the outer surface of the limiting unit and the inner wall of the suction conduit can suppress the limiting unit from affecting the axial movement or flow of the fluid.

[0046] Preferably, the fitting gap between the outer side of the limiting unit and the inner wall of the suction catheter is 0.05mm ≤ fitting gap ≤ 3mm.

[0047] As an embodiment of the present invention, the distal end of the rotating body is provided with a protruding member, which can increase the vortex volume of the vortex and enhance the ability to break up blockages.

[0048] As an embodiment of the present invention, the rotary drive includes a motor, a controller and a power supply. The output end of the motor is connected to the proximal end of the flexible drive shaft for driving the flexible drive shaft to rotate forward or in reverse. The motor is electrically connected to the controller, and the power supply is electrically connected to both the motor and the controller.

[0049] As an embodiment of the present invention, the limiting unit includes a limiting ring, and a plurality of support plates are uniformly provided on the outer circumferential surface of the limiting ring. A fitting gap is provided between the radially outward end of the support plate and the inner wall of the suction conduit. The flexible drive shaft is axially slidably disposed in the central hole of the limiting ring.

[0050] As an embodiment of the present invention, the motor module can be connected to the proximal end of the flexible drive shaft by one of the following methods: coupling, gear, gearbox, clutch, magnetism, or slot.

[0051] As an embodiment of the present invention, the proximal end of the protective sleeve extends axially to the proximal end of the flexible drive shaft, and the proximal end of the protective sleeve is provided with a rotary shaft seal unit, which is one or a combination of a sealing gasket, a sealing ring, and a sealing rubber ring.

[0052] As an embodiment of the present invention, the material of the rotating body is one or a combination of metal, polymer.

[0053] As an embodiment of the present invention, the mass of the rotating body is less than the mass of a flexible drive shaft of the same volume.

[0054] The present invention also provides a rotating body for an intravascular clot removal system, comprising a rotating body having a plurality of openings or channels. When the rotating body rotates, it can break up clots in the blood vessels and generate eddies through the openings or channels, drawing the clots on the distal side of the rotating body toward the proximal side of the rotating body.

[0055] As an embodiment of the present invention, the rotating body includes a first section that generates eddies by rotation and a second section that breaks up blockages by rotation. The second section is fixed to the distal end of the first section. The outer side of the first section is provided with a plurality of openings or channels. The outer peripheral surface or distal end surface of the second section is provided with a plurality of protruding members for breaking up blockages during rotation.

[0056] As an embodiment of the present invention, each of the openings is uniformly disposed on the outer peripheral surface of the first segment along the circumferential direction, and each of the channels is uniformly disposed within the first segment along the circumferential direction.

[0057] As an embodiment of the present invention, the opening or the orifice also serves to guide fluid flow. For example, it guides fluid located at the distal fluid inlet of the suction conduit through the rotating body or to the proximal region of the rotating body; the fluid flow guiding function of the opening or the orifice further enhances the attraction or suction capacity of the vortex on the blockage. For example, guiding fluid located at the distal fluid inlet of the suction conduit toward the blockage to flow or impact can work in conjunction with the rotating body to break up the blockage.

[0058] 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.

[0059] Example 1

[0060] like Figures 1-5As shown, an intravascular clot removal system 1000 includes a flexible drive shaft 1300 with an axial length value, a rotating body 1200, an aspiration catheter 1100, and a motor module 1400; the rotating body 1200 has a distal end face 1210, a proximal end face 1220, a shaft 1230, a first side face 1240, and a second side face 1250; the distal end 1310 of the flexible drive shaft 1300 is coaxially fixed to the proximal end face 1220 of the rotating body 1200, and the proximal end 1340 of the flexible drive shaft 1300 is connected to the motor module 1400; the aspiration catheter 1100 is... A fluid inlet 1120 is provided at the distal end 1110 of the aspiration catheter 1100, which is axially sleeved on the outside of the rotating body 1200. The distance from the first side 1240 of the rotating body 1200 to the axis 1230 is greater than the distance from the second side 1250 to the axis 1230. The rotating body 1200 and the aspiration catheter 1100 are in clearance fit, with the mating surfaces being the first side 1240 and the inner diameter surface 1130 of the aspiration catheter, and a mating clearance f satisfying the condition 0.1mm≤f≤5mm. The second side 1250 of the rotating body 1200 extends axially in a spiral to form a fluid guide channel 1260. The intravascular clot removal system 1000 is used to capture, emulsify, aspirate, or transfer clots 1500 located in biological hollow cavities or hollow organs. In operation, the aspiration catheter 1100 containing a rotating body 1200 within the intravascular clot removal system 1000 is positioned or traverses within a biological hollow cavity. For example, through a series of procedures required for interventional minimally invasive surgery, the distal end 1110 of the aspiration catheter 1100 and the rotating body 1200 are delivered to a target vascular segment, ventricle, or intracranial cavity containing clot 1500. The rotating body 1200 is positioned within the lumen of the aspiration catheter 1100 after the fluid inlet 1120, with an axial distance L1 between the distal end face 1210 and the fluid inlet 1120. This arrangement results in the distal segment of the aspiration catheter 1100 forming a liquid-filled cavity in front of the distal end face 1210 of the rotating body 1200. The liquid filling the cavity originates from within the biological hollow cavity itself or is supplied by the aspiration catheter 1100. After the fluid inlet 1120 faces the blockage 1500, the start motor module 1400 drives the flexible drive shaft 1300 to rotate the rotating body 1200. When the rotating body 1200 is rotating, part of the liquid in front of it will move circumferentially due to the adhesion of the solid-liquid interface and thus cause vortices as the rotating body 1200 rotates. Another part will flow to the proximal end face 1220 of the rotating body 1200 through the fluid guide channel 1260, thereby causing the liquid in the distal region of the rotating body 1200 to be emptied. Under the two effects, a negative pressure chamber with a pressure lower than the working environment is formed in the distal region of the rotating body 1200. The negative pressure chamber will attract and drag the blockage 1500 located in front of the fluid inlet 1120 into the distal section of the suction conduit 1100, thereby completing the capture of the blockage 1500.

[0061] The ability of the intravascular clot removal system 1000 to capture clots 1500 is affected by the negative pressure value within the negative pressure chamber. This negative pressure value is influenced by numerous factors, including the rotational speed of the drive source, the structure of the rotating body 1200, and the coordination between the rotating body 1200 and the aspiration catheter 1100. While increasing the rotational speed and adding eccentric components can significantly increase the vortex volume and thus the negative pressure value, this also undoubtedly increases the vibration intensity and operational difficulty at the distal end of the system, which is particularly undesirable in minimally invasive interventional procedures. Non-eccentric axial rotating bodies can significantly improve the stability of system operation and effectively suppress eccentric vibration. Furthermore, effective coordination between the axial rotating body and the outer tube can enhance the ability to generate high negative pressure values. In the system of this invention, the design of the range of the coordination gap f effectively ensures that the system generates the expected negative pressure capability while suppressing eccentric amplitude vibrations during high-speed rotation of the rotating body 1200 when the distal end 1310 of the flexible drive shaft 1300 is uncontrolled.

[0062] At high speeds, such as 10,000 rpm, the clotted material 1500 located in the distal region of the rotating body 1200 tends to be broken up and emulsified. Some of the smaller particles of clotted material 1500 move along the fluid guide channel 1260 with the liquid toward the proximal end 1340 of the flexible drive shaft 1300 and are forcefully thrown away from the proximal end face 1220 of the rotating body 1200; thus completing the transfer of the clotted material 1500 within the suction conduit 1100.

[0063] Example 2

[0064] An intravascular clot removal system 2000, such as Figure 6 and Figure 7 The second side 2250 of the rotating body 2200 is arranged at an angle to the generatrix of the rotating body 2200; the distal end face 2210 of the rotating body 2200 is provided with a protruding member 2270, which is hemispherical. The first side 2240 of the rotating body 2200 is a mating surface with the suction conduit. The second side 2250 of the rotating body 2200 extends axially in a spiral manner to form a fluid guide channel. The rotating body 2200 has a shaft 2230.

[0065] The addition of the protruding component 2270 not only enhances the emulsification ability of the intravascular clot removal system for clots, but also enhances the vortexing ability of the rotating body 2200 on the liquid, increasing the vortex volume and further improving the system's ability to capture clots.

[0066] The shape and arrangement of the protruding member structure on the distal end face 2210 of the rotating body 2200 are not limited to the examples described above, and can also be, for example... Figures 8-11As shown, the protrusions formed by the intersection of the distal end face 2210 and the second side face 2250, such as 2270A, 2270B, and 2270C, or the protruding components that form 2270D only on the distal end face 2210, can be in various shapes such as hemispheres, cylinders, frustums, crescents, irregular shapes, fish scales, buckets with open cavities, etc.

[0067] Example 3

[0068] An intravascular clot removal system 3000, such as Figures 12-14 As shown, the system includes a flexible drive shaft 3300 with an axial length value and a rotating body 3200. The distal end of the flexible drive shaft 3300 is coaxially fixed to the proximal end face of the rotating body 3200. The system also includes a limiting unit 3600 for suppressing the eccentric amplitude generated by the distal end of the flexible drive shaft 3300 (that is, the main function of the limiting unit is radial limiting, reducing the swing length of the distal end of the flexible drive shaft from the axis of the suction catheter, so that the high-speed rotating distal end of the flexible drive shaft can quickly break free). (Oscillation recovery to a stable state), one embodiment of the limiting unit 3600 consists of mutually fixed support pieces 3610 and a limiting ring 3620, with a clearance fit hole 3630 on the limiting ring 3620; the distal end of the flexible drive shaft 3300 passes through the clearance fit hole 3630 and is fitted with the limiting ring 3620 with a clearance fit; one end of a plurality of support pieces 3610 is fixed to the outside of the limiting ring 3620, and the opposite end is slidably in contact with the inner wall of the suction catheter 3100. The flexible drive shaft 3300 is axially slidable relative to the limiting unit 3600.

[0069] In addition to the above structure, the limiting unit 3600 can also be, for example, a cylindrical helical spring, a variable-diameter helical spring, or a planar spiral spring arranged on the outer peripheral surface of the distal section of the flexible drive shaft, with a clearance fit between the distal section of the flexible drive shaft and the inner peripheral surface of the spring, and a clearance fit or tight fit between the outer peripheral surface of the spring and the suction conduit 3100; a strut (e.g., several spokes / plates evenly arranged circumferentially on the outer peripheral surface of the distal section of the flexible drive shaft); a magnetic component (e.g., magnetic material arranged on the outer peripheral surface of the distal section of the flexible drive shaft, while magnetic material with repulsive magnetic poles is arranged on the distal section of the suction conduit 3100); or a magnetic shape memory alloy, or a combination thereof; the limiting unit 3600 is positioned at a defined location on the distal section of the flexible drive shaft. The material of the limiting unit 3600 can be a polymer, a metal, or a ferromagnetic material.

[0070] Example 4

[0071] An intravascular clot removal system 4000, such as Figures 15-19As shown, the device includes a flexible drive shaft 4300 with an axial length, a rotating body 4200, a suction conduit 4100, a limiting unit 4600, and a protective sleeve 4700, as well as a motor module 4500. The rotating body 4200 has a distal end face, a proximal end face, a shaft center, a first side face 4240, and a second side face 4250. A protruding member 4270 is provided on the distal end face of the rotating body 4200. The distance from the first side face 4240 to the shaft center is greater than the distance from the second side face 4250 to the shaft center. The second side face 4250 of the rotating body 4200 extends axially to form a fluid guide groove 4260. The distal end of the flexible drive shaft 4300 is coaxially fixed to the proximal end face of the rotating body 4200, and the proximal end of the flexible drive shaft 4300 is connected to the motor module 4500 via groove and tongue fastener assemblies 4310 and 4510. The protective sleeve 4700 is used to suppress friction between the flexible drive shaft 4300 and the inner diameter surface of the suction catheter 4100. The flexible drive shaft 4300 is fitted by the protective sleeve 4700 from proximal to distal end with a clearance fit. The proximal end of the protective sleeve 4700 is provided with an injection port 4710 to guide liquid flow into the gap between the flexible drive shaft 4300 and the protective sleeve 4700. Physiological saline or other liquids are injected into the inner cavity of the protective sleeve 4700 through the injection port 4710 to wet the surface of the flexible drive shaft 4300 and reduce friction. The distal end of the protective sleeve 4700 is not in contact with the rotating body 4200. A limiting unit 4600 is fixedly connected to the distal section of the protective sleeve 4700. The limiting unit 4600 has several radially limiting support plates / spokes arranged circumferentially. The suction conduit 4100 is axially sleeved on the outside of the rotating body 4200, the flexible drive shaft 4300, the limiting unit 4600, and the protective sleeve 4700. The distal end of the suction conduit 4100 has a fluid inlet 4120, and the proximal section of the suction conduit 4100 has a communicating suction port 4140 for negative pressure suction to remove blockages located near the proximal end of the rotating body 4200. The support plates / spokes of the limiting unit 4600 are slidably in contact with the inner diameter wall 4130 of the suction conduit 4100 to achieve contact with the protective sleeve 4700. The radial limit of 00 suppresses eccentric vibration of the distal end of the flexible drive shaft 4300 or the rotating body 4200. The rotating body 4200 and the suction conduit 4100 are in clearance fit, with the mating surfaces being the first side surface 4240 and the inner diameter wall 4130 of the suction conduit, and a mating clearance f satisfying the condition 0.1mm≤f≤5mm exists. The rotating body 4200 is configured to move axially relative to the suction conduit 4100 in a controllable manner, that is, the rotating body 4200 can move away from the suction conduit 4100 through the fluid inlet 4120. The motor module 4500 is used to drive the flexible drive shaft 4300 to rotate. The motor module 4500 includes a motor, a controller, and a power supply. The motor module 4500 is configured to have the driving capability to drive the flexible drive shaft 4300 to generate a speed of 0 to 30,000 rpm, and the motor module 4500 is configured to have two rotation drive modes: counterclockwise and clockwise.

[0072] The radially outward end of the support plate / spoke of the limiting unit 4600 is clearance-fitted with the inner diameter wall 4130 of the suction conduit 4100, with a clearance value of 0.01mm ≤ clearance value ≤ 4mm. The clearance between the outer surface of the limiting unit 4600 (i.e., the radially outward end of the support plate / spoke) and the inner wall of the suction conduit 4100 can suppress the limiting unit 4600 from affecting the axial movement or flow of the fluid.

[0073] The intravascular clot removal system 4000 is used to capture, emulsify, aspirate, or transfer clots located within biological hollow cavities or hollow organs. In operation, the aspiration catheter 4100, containing a rotating body 4200 within the intravascular clot removal system 4000, is positioned or traversed within a biological hollow cavity, for example, through a series of procedures required for interventional minimally invasive surgery, delivering the distal segment of the aspiration catheter 4100 and the rotating body 4200 to a target vascular segment, ventricle, or intracranial cavity containing the clot. When the blockage is large, flexible, or hard, the operator can choose the following method depending on the specific situation: Fix the suction conduit 4100 stationary, drive the flexible drive shaft 4300 to propel the rotating body 4200 through the fluid inlet 4120 away from the suction conduit 4100, and position the protruding member 4270 at the distal end of the rotating body 4200 towards the blockage. Start the motor module 4500 to drive the rotating body 4200 to rotate in the opposite direction at a low speed (e.g., 60–150 rpm), similar to the operation of a tunnel boring machine. While rotating in the opposite direction, the rotating body 4200 drives the fluid in the surrounding environment to flush away the blockage in front, and the protruding member 4270 acts on the blockage. After gradually penetrating the blockage, drive the rotating body 4200 to rotate in the forward direction at a medium to low speed (e.g., 100–500 rpm), so that the fluid in the surrounding environment pushes the blockage behind the rotating body 4200 towards the fluid inlet 4120 to capture the blockage. When some or all of the clotted material enters the suction conduit 4100 through the fluid inlet 4120, the operator can choose, depending on the specific situation, to retract the rotating body 4200 into the suction conduit 4100, drive the rotating body 4200 to rotate in the forward direction at medium to high speed (e.g., 500 to 30,000 rpm) to emulsify the clotted material, and remove the clotted material located near the rotating body 4200 by negative pressure suction through the suction port 4140 in a timely manner to ensure the unobstructed flow within the suction conduit 4100 of the system.

[0074] Example 5

[0075] like Figures 20-22As shown, a rotating body of an intravascular clot removal system includes a rotating body 5000, which includes a first section 5100 that generates vortices during rotation and a second section 5200 that breaks up clots during rotation. The outer peripheral surface of the first section 5100 of the rotating body 5000 is provided with a plurality of openings 5110, which generate vortices when the rotating body 5000 rotates. The distal surface of the second section 5200 of the rotating body 5000 is provided with a protruding member 5220, which breaks up clots when the rotating body 5000 rotates.

[0076] The proximal end face of the first segment 5100 of the rotating body 5000 is coaxially fixed to the flexible drive shaft 5300. The rotating body 5000 with the flexible drive shaft fixed to it is placed in the lumen of the distal segment of the aspiration catheter. The rotating body 5000 is manipulated to move axially relative to the aspiration catheter towards the distal fluid inlet until the second segment 5200 of the rotating body 5000 is exposed in the lumen of the aspiration catheter, and the first segment 5100 of the rotating body 5000 is located in the lumen of the aspiration catheter. The flexible drive shaft 5300 drives the rotating body 5000 to rotate. At this time, the intravascular clot removal system composed of the rotating body 5000, the flexible drive shaft 5300 and the aspiration catheter can both break up the clots outside the aspiration catheter and generate eddies to draw the clots outside the aspiration catheter into the aspiration catheter.

[0077] 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 rotating body of an intravascular clot removal system, characterized in that: The rotating body is a non-eccentric axial rotating body. The rotating body has an axis, a first side surface, and a second side surface. The distance from the first side surface to the axis is greater than the distance from the second side surface to the axis. The proximal end face of the rotating body is coaxially fixed to the distal end of a flexible drive shaft. The flexible drive shaft is a flexible drive shaft with an axial length value. The rotating body includes a rotating body with several openings or channels. When the rotating body rotates, it can break up the clots in the blood vessels and generate eddies through the openings or channels, drawing the clots on the distal side of the rotating body towards the proximal side of the rotating body.

2. The rotating body of the intravascular clot removal system according to claim 1, characterized in that: The rotating body includes a first section that generates vortices by rotation and a second section that breaks up blockages by rotation. The second section is fixed to the distal end of the first section. The outer side of the first section is provided with a plurality of openings or channels. The outer peripheral surface or distal end surface of the second section is provided with a plurality of protruding members for breaking up blockages during rotation.

3. The rotating body of the intravascular clot removal system according to claim 2, characterized in that: Each of the openings is uniformly arranged circumferentially on the outer circumferential surface of the first segment, and each of the channels is uniformly arranged circumferentially within the first segment.

4. The rotating body of the intravascular clot removal system according to claim 1, characterized in that: The opening or the channel also serves to guide fluid flow.

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