Suction catheter, intervention device and thrombectomy training system

Abstract

The utility model discloses a suction catheter, an intervention device and a thrombectomy training system.The suction catheter comprises a suction pipe and a filtering part, the suction pipe comprises a pipe body, a suction channel, a suction inlet and a suction outlet are formed in the pipe body, and the suction inlet and the suction outlet communicate with the suction channel; the filtering piece is arranged in the suction channel and is positioned between the suction inlet and the suction outlet; in the intervention state, the suction inlet is located at the preset suction position, the suction outlet is located at the preset liquid discharging position, and the pipe body penetrates through the middle transition area from the preset suction position and extends to the preset liquid discharging position.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, and in particular relates to aspiration catheters, interventional devices, and thrombectomy training systems. Background Technology

[0002] The main treatments for thrombotic diseases include anticoagulation, antithrombotic, and thrombolytic drug therapy, as well as interventional surgery. During interventional surgery, a stent can be used to directly remove the thrombus, but this method cannot guarantee complete removal of the thrombus, and residual thrombus may remain. Alternatively, mechanical structures or high-speed water jets can be used to cut the thrombus attached to the surface of the blood vessel, and the fragments can be suctioned out. However, this method may damage red blood cells or the blood vessel wall during the fragmentation process, and the fragments may also be displaced to other parts of the patient's body, affecting patient safety.

[0003] Currently, to avoid residual thrombi and injury to patients during thrombus fragmentation, negative pressure aspiration can be used to remove thrombi from the patient's body. When this aspiration structure is used to intervene and aspirate thrombi, the positions of its aspiration inlet and outlet have a significant impact on the effectiveness of thrombus removal and the impact on the patient. Utility Model Content

[0004] This application provides an aspiration catheter, an interventional device, and a thrombectomy training system, which can reduce the impact of the aspiration catheter on the patient.

[0005] This application provides an aspiration catheter, including an aspiration tube and a filter element. The aspiration tube includes a tube body, and an aspiration channel, an aspiration inlet, and an aspiration outlet are formed within the tube body. The aspiration inlet and the aspiration outlet are respectively connected to the aspiration channel. The filter element is disposed within the aspiration channel and located between the aspiration inlet and the aspiration outlet. In the intervention state, the aspiration inlet is located at a preset aspiration position, the aspiration outlet is located at a preset drainage position, and the tube body extends from the preset aspiration position through an intermediate transition zone to the preset drainage position.

[0006] According to an embodiment of the first aspect of this application, along the axial direction of the suction tube, the tube body includes a first suction section, a second suction section, and a third suction section arranged sequentially. The first suction section, the second suction section, and the third suction section together define a suction channel. The suction inlet and the suction outlet are located in the first suction section and the third suction section, respectively. In the intervention state, the angle between the extension direction of the first suction section and the extension direction of the second suction section is an acute angle, and the angle between the extension direction of the second suction section and the extension direction of the third suction section is an acute angle.

[0007] According to the embodiment of the first aspect of this application, the axial lengths of the first suction section, the second suction section and the third suction section are all greater than or equal to 5 mm and less than or equal to 60 mm.

[0008] According to the first aspect of this application, the aspiration catheter is used to aspirate thrombi, with the preset aspiration location being the pulmonary artery, the preset drainage location being the junction of the inferior vena cava and the superior vena cava, and the intermediate transition zone being the right ventricle and the right atrium.

[0009] According to an embodiment of the first aspect of this application, it further includes an outflow channel connected to the proximal end of the suction tube, the outflow channel having an outflow window communicating with the suction outlet, and in the intervention state, the outflow window being located at a preset drainage position.

[0010] According to an embodiment of the first aspect of this application, it further includes a first connecting block and a first sleeve that are detachably connected, one of the first connecting block and the first sleeve being located on the outflow channel and the other being located at the proximal end of the suction tube; the first sleeve is provided with a first connecting groove that extends along the maze path, and when the first connecting block is connected to the first sleeve, at least a portion of the first connecting block is located within the maze path.

[0011] According to an embodiment of the first aspect of this application, along the axial direction of the aspiration tube, the tube body includes a distal aspiration tube and a proximal aspiration tube arranged sequentially, the distal aspiration tube and the proximal aspiration tube jointly defining an aspiration channel, the aspiration inlet and the aspiration outlet being located in the distal aspiration tube and the proximal aspiration tube, respectively; the aspiration tube also includes a second sleeve and a third sleeve detachably connected, one of the second sleeve and the third sleeve being connected to the proximal end of the distal aspiration tube, and the other being connected to the distal end of the proximal aspiration tube; the second sleeve is provided with a second connecting block, and the third sleeve is provided with a second connecting groove penetrating the third sleeve, when the second sleeve and the third sleeve are connected, at least a portion of the second connecting block is located in the second connecting groove; in the intervention state, the distal aspiration tube passes through the intermediate transition zone from the preset aspiration position and is connected to the proximal aspiration tube through the second sleeve and the third sleeve, and the proximal aspiration tube extends from the intermediate transition zone to the preset drainage position.

[0012] According to an embodiment of the first aspect of this application, the second sleeve is connected to the distal end of the proximal inhalation tube, and the third sleeve is connected to the proximal end of the distal inhalation tube.

[0013] The second connecting block is disposed on the outer peripheral surface of the second sleeve. The second connecting block includes a first peripheral surface, a first inclined surface and a second inclined surface. The first peripheral surface is spaced apart from the outer peripheral surface of the second sleeve. The first inclined surface connects the far end of the first peripheral surface and the outer peripheral surface of the second sleeve. The second inclined surface connects the first peripheral surface and the outer peripheral surface of the second sleeve. The second inclined surface is located on at least one side of the first peripheral surface in the circumferential direction.

[0014] According to an embodiment of the first aspect of this application, a one-way valve is also included, which is disposed in the suction channel and located at the distal end of the filter element.

[0015] An embodiment of the second aspect of this application provides an interventional device, comprising: a delivery sheath and an aspiration catheter, wherein the delivery sheath has a first passage; the aspiration catheter includes an aspiration tube and a filter element, the aspiration tube includes a tube body, and an aspiration channel, an aspiration inlet and an aspiration outlet are formed within the tube body, the aspiration inlet and the aspiration outlet being respectively connected to the aspiration channel; the filter element is disposed within the aspiration channel and located between the aspiration inlet and the aspiration outlet; the interventional device includes an interventional state, in which at least a portion of the aspiration catheter is located within the first passage, and the aspiration outlet extends into the first passage from the proximal end of the delivery sheath and extends out of the first passage from the distal end of the delivery sheath, the aspiration inlet is located at a preset aspiration position, the aspiration outlet is located at a preset drainage position, and the tube body extends from the preset aspiration position through an intermediate transition zone to the preset drainage position.

[0016] An embodiment of the third aspect of this application provides a thrombectomy training system, including a human model, a delivery sheath, and an aspiration catheter as described in any of the embodiments of the first aspect above. The human model contains a simulated heart and simulated blood vessels, including the femoral vein, superior vena cava, inferior vena cava, and pulmonary artery, forming a closed circulatory loop between the simulated heart and the simulated blood vessels. A colored liquid is injected into the simulated blood vessels to simulate blood, and hydrogel is filled into the pulmonary artery to simulate a thrombus. The system is characterized in that it includes an interventional state, a second state, and a separation state. In the interventional state, the delivery sheath is punctured through the femoral vein and sequentially passed through the femoral vein, inferior vena cava, the right atrium of the simulated heart, and the right ventricle of the simulated heart before being pushed to the pre-existing thrombus. In the first state, the aspiration position is set as the pulmonary artery. At least part of the aspiration catheter is located within the first pathway, and the aspiration outlet extends into the first pathway from the proximal end of the delivery sheath and extends out of the first pathway from the distal end of the delivery sheath. The aspiration inlet is located at the preset aspiration position, and the aspiration outlet is located at the preset drainage position. The catheter extends from the preset aspiration position through an intermediate transition zone to the preset drainage position. In the second state, the aspiration inlet is still located at the preset aspiration position, the aspiration outlet is still located at the preset drainage position, at least part of the aspiration catheter is located within the first pathway, and the outflow window is covered by the delivery sheath. In the separated state, the distal end of the delivery sheath is located at the preset aspiration position, the delivery sheath and the aspiration catheter are separated, and the aspiration catheter is retracted outside the human model.

[0017] The aspiration catheter of this application embodiment incorporates a filter element located within the aspiration channel, between the aspiration inlet and the aspiration outlet. This allows the filter element to collect the thrombus as blood and thrombi flow into the aspiration channel from the aspiration inlet, while the blood passes through the filter element and flows out from the aspiration outlet. This reduces blood loss while collecting thrombi, thereby minimizing the impact of the aspiration catheter on the patient. Furthermore, by positioning the aspiration inlet and aspiration outlet at preset aspiration and drainage positions respectively in the interventional state, both outside the intermediate transition zone and located on opposite sides of it, the direct impact of blood being drawn from the preset aspiration position on the intermediate transition zone is reduced when blood and thrombi are aspirated at the preset aspiration position. This reduces the load on the intermediate transition zone caused by the aspiration catheter. Similarly, when blood is discharged from the preset drainage position, the direct impact of the discharged blood on the intermediate transition zone is reduced, further minimizing the load on the intermediate transition zone caused by the aspiration catheter. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the intervention when the aspiration catheter is inserted into the patient's body according to some embodiments of this application;

[0020] Figure 2 A longitudinal cross-sectional view of an example suction tube and filter element in the intervention state is shown.

[0021] Figure 3 A schematic diagram of the structure of an example first sleeve is shown;

[0022] Figure 4 A schematic diagram of an example outflow channel is shown;

[0023] Figure 5 A front view schematic diagram of the structure of an example first sleeve is shown;

[0024] Figure 6 A schematic diagram of an example thrombus aspiration catheter after partial straightening is shown;

[0025] Figure 7 An example is shown. Figure 6 A schematic diagram of the longitudinal cross-sectional structure of the thrombus aspiration catheter in the middle;

[0026] Figure 8This diagram illustrates the structure of an example second and third sleeve when they are separated.

[0027] Figure 9 An enlarged schematic diagram of an example second sleeve is shown;

[0028] Figure 10 A schematic diagram of an example check valve is shown;

[0029] Figure 11 A schematic diagram of an example connection part is shown;

[0030] Figure 12 A partial longitudinal cross-sectional schematic diagram of an example delivery sheath is shown;

[0031] Figure 13 A flowchart illustrating an example thrombectomy training method is shown.

[0032] Figure label:

[0033] 10. Aspiration catheter; 20. Delivery sheath; 21. First access route;

[0034] 100. Suction tube; 110. Distal suction tube; 120. Proximal suction tube; 140. Second sleeve; 141. Second connecting block; 142. First circumferential surface; 143. First inclined surface; 145. Second inclined surface; 150. Third sleeve; 151. Second connecting groove; 160. Tube body; 161. Suction channel; 162. Suction inlet; 163. Suction outlet; 164. First suction section; 165. Second suction section; 166. Third suction section;

[0035] 200. Filter element; 210. Connecting part;

[0036] 300, Outflow channel; 310, Outflow window; 320, First connecting block;

[0037] 400. Impeller;

[0038] 500, drive transistor;

[0039] 600, First sleeve; 610, First connecting groove; 611, First section; 612, Second section; 613, First sub-section; 614, Second sub-section; 620, Boss;

[0040] 700. Check valve;

[0041] x, the first direction. Detailed Implementation

[0042] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0044] The aspiration catheter, interventional device, and thrombectomy training method provided in this application will be described below with reference to the accompanying drawings. It should be noted that in the drawings, the direction extending from the distal end to the proximal end of the aspiration catheter along the line connecting the proximal and distal ends is designated as the first direction, denoted as x. In the drawings, for ease of drawing, the dimensions are not necessarily proportional to actual dimensions. For ease of drawing and description, the x-direction in the drawings is a straight line, but in reality, the aspiration catheter has a certain degree of flexibility to facilitate its insertion into the blood vessel; therefore, the extension direction of the central axis of the aspiration catheter can also be curved.

[0045] Figure 1 This is a schematic diagram of the intervention when the aspiration catheter is inserted into the patient's body according to some embodiments of this application;

[0046] Figure 2 A longitudinal cross-sectional view of an example suction tube and filter element in the intervention state is shown.

[0047] Combination Figure 1As can be seen, in order to solve the technical problems involved in the background art, the applicant proposes a suction conduit 10, which includes a suction tube 100 and a filter element 200. The suction tube 100 includes a tube body 160, and a suction channel 161, a suction inlet 162, and a suction outlet 163 are formed within the tube body 160. The suction inlet 162 and the suction outlet 163 are respectively connected to the suction channel 161. The filter element 200 is disposed within the suction channel 161 and is located between the suction inlet and the suction outlet. In the intervention state, the suction inlet 162 is located at a preset suction position, the suction outlet 163 is located at a preset drainage position, and the tube body 160 extends from the preset suction position through an intermediate transition zone to the preset drainage position.

[0048] The intermediate transition zone refers to an area with specific requirements. In some application scenarios, various indicators and parameters of the intermediate transition zone fluctuate periodically within a certain range, such as flow rate, flow volume, pressure, and pressure difference. This is understandable. When the suction catheter 10 is working, if the suction outlet 163 is located in the intermediate transition zone, the suctioned liquid may cause at least one indicator and parameter of the intermediate transition zone to exceed the preset fluctuation range, or it may cause a change in the periodic pattern of the intermediate transition zone. Similarly, if the suction inlet 162 is located in the intermediate transition zone, the blood drawn away by the suction catheter 10 may also cause at least one indicator and parameter of the intermediate transition zone to exceed the preset fluctuation range, or it may cause a change in the periodic pattern of the intermediate transition zone. Therefore, the suction catheter 10 provided in this application avoids the intermediate transition zone during suction by ensuring that both the suction inlet 162 and the suction outlet 163 are located away from the intermediate transition zone, thereby reducing the impact of the suction catheter 10 on the intermediate transition zone during operation.

[0049] In some implementations, the suction inlet is positioned relative to a preset suction position, the suction outlet is positioned relative to a preset drainage position, and the suction tube between the suction inlet and outlet is positioned relative to an intermediate transition zone. In some implementations, the entire suction tube between the suction inlet and outlet is positioned relative to the intermediate transition zone. In other alternative implementations, a portion of the suction tube between the suction inlet and outlet is positioned relative to the intermediate transition zone.

[0050] In this application, by reasonably setting the shape and size of the suction conduit, the suction outlet can avoid the intermediate transition zone when suctioning the target object at the preset suction position, so as to avoid affecting the index parameters of the intermediate transition zone and maintain the stability and periodicity of the intermediate transition zone.

[0051] In some implementations, the liquid flow direction within the suction channel is opposite to the liquid flow direction outside the tube. In other alternative implementations, the liquid flow direction within the suction channel is the same as the liquid flow direction outside the tube, or there is an angle between the liquid flow direction within the suction channel and the liquid flow direction outside the tube.

[0052] It is understood that the suction catheter provided in this application is suitable for a wide variety of application scenarios, especially for application scenarios where the liquid flow direction is opposite to the liquid flow direction outside the tube, or where there is an angle between the liquid flow direction inside the suction channel and the liquid flow direction outside the tube, which can effectively reduce the backflow problem caused by conventional suction catheters.

[0053] In some embodiments, the axial length of the suction tube 100 is 10mm to 200mm, and the insertion size of the suction tube 100 is 5F to 30F.

[0054] It is understandable that the aspiration tube 100 has a certain degree of elasticity, which allows it to bend and extend according to the direction of blood vessels in the interventional environment during intervention, until the aspiration inlet 162 is located at the preset aspiration position and the aspiration outlet 163 is located at the preset drainage position, and the tube body 160 extends from the preset aspiration position through the intermediate transition zone to the preset drainage position.

[0055] In some embodiments, the aspiration catheter 10 is used to aspirate thrombi, with the preset aspiration location being the pulmonary artery and the preset drainage location being the confluence of the inferior vena cava and superior vena cava, with the intermediate transition zone being the right ventricle and right atrium. When the aspiration catheter 10 aspirates thrombi in the pulmonary artery, the aspiration outlet 163 can remain at the confluence of the superior and inferior vena cava, while the more flexible aspiration tube 100 bends and extends, passing sequentially through the right atrium and right ventricle, ultimately placing the distal aspiration inlet 162 within the pulmonary artery. This allows blood flowing from the aspiration outlet 163 out of the aspiration channel 161 to first mix with venous blood at the confluence of the superior and inferior vena cava before entering the heart, avoiding direct impact on the heart and causing excessive load on the right ventricle. Furthermore, since the aspiration inlet 162 and aspiration outlet 163 are located at the confluence of the pulmonary artery and the superior vena cava and inferior vena cava, respectively, the fluid flow direction within the aspiration channel 161 is from the pulmonary artery through the right ventricle and right atrium to the confluence of the superior vena cava and inferior vena cava. The fluid flow direction outside the tube 160 is from the confluence of the superior vena cava and inferior vena cava through the right atrium and right ventricle to the pulmonary artery. The fluid flow direction within the aspiration channel 161 is opposite to that outside the tube 160. Because both the aspiration inlet 162 and aspiration outlet 163 avoid the heart during intervention, the blood aspiration and drainage are not directly located within the heart's chambers, thus reducing the load on the heart during the operation of the aspiration catheter 10.

[0056] Of course, in other embodiments, the preset aspiration position, preset drainage position, and intermediate transition zone can also be other regions. For example, the intermediate transition cavity can be a chamber within the heart, and the preset aspiration position or preset drainage position can be another chamber within the heart. Alternatively, the intermediate transition zone can be a vein, and the preset aspiration position and preset drainage position can be another vein.

[0057] The aspiration catheter 10 provided in this application, by incorporating a filter element 200, is positioned within the aspiration channel 161 and between the aspiration inlet 162 and the aspiration outlet 163. This allows the thrombus to be collected by the filter element 200 as blood and thrombi flow from the aspiration inlet 162 into the aspiration channel 161, while the blood passes through the filter element 200 and flows out from the aspiration outlet 163. This reduces blood loss while collecting thrombi, thereby minimizing the impact of the aspiration catheter 10 on the patient. Furthermore, by positioning the aspiration inlet 162 and the aspiration outlet 163 in the interventional state at preset aspiration and drainage positions, respectively, both outside the intermediate transition zone and located on opposite sides of the zone, the direct impact of reduced blood flow outside the preset aspiration position on the intermediate transition zone is minimized when the aspiration inlet 162 aspirates blood and thrombi at the preset aspiration position. This further reduces the load on the intermediate transition zone caused by the aspiration catheter 10. It also reduces the direct impact of the blood discharged from the preset drainage position on the intermediate transition zone when the suction outlet 163 discharges blood at the preset drainage position, further reducing the load on the intermediate transition zone caused by the suction catheter 10.

[0058] After describing the overall structure of the interventional device, the following section will describe several implementation methods of the suction tube 100 in conjunction with the accompanying drawings.

[0059] Combination Figures 1 to 2 As can be seen, along the axial direction of the suction tube 100, the tube body 160 includes a first suction section 164, a second suction section 165, and a third suction section 166 arranged sequentially. The first suction section 164, the second suction section 165, and the third suction section 166 together define the suction channel 161. The suction inlet 162 and the suction outlet 163 are located in the first suction section 164 and the third suction section 166, respectively. In the intervention state, the angle between the extension direction of the first suction section 164 and the extension direction of the second suction section 165 is an acute angle, and the angle between the extension direction of the second suction section 165 and the extension direction of the third suction section 166 is also an acute angle. In some implementations, the first suction section 164, the second suction section 165, and the third suction section 166 form a "Z" shape or other planar or spatial shape; this application does not specifically limit this.

[0060] In this application, the proximal end refers to the end facing the operator or physician, and the distal end refers to the end away from the operator or physician. The proximal side refers to the side of one component that is closer to the proximal end relative to another component, and the distal side refers to the side of one component that is closer to the distal end relative to another component.

[0061] In some embodiments, the axial lengths of the first suction section 164, the second suction section 165, and the third suction section 166 are all greater than or equal to 5 mm and less than or equal to 60 mm.

[0062] The aspiration catheter 10 provided in this application, by ensuring that, in the interventional state, the angle between the extension directions of the first aspiration segment 164 and the second aspiration segment 165 is an acute angle, and the angle between the extension directions of the second aspiration segment 165 and the third aspiration segment 166 is also an acute angle, allows the aspiration catheter 100 to pass through the heart by bending at least twice. This results in the aspiration inlet 162 being located in the pulmonary artery and the aspiration outlet 163 being located at the confluence of the superior and inferior vena cava. This enables the aspiration catheter 10 to aspirate thrombi in the pulmonary artery and return the aspirated blood to the confluence of the superior and inferior vena cava. By ensuring that the axial lengths of the first aspiration segment 164, the second aspiration segment 165, and the third aspiration segment 166 are all greater than or equal to 5 mm and less than or equal to 60 mm, the lengths of each segment of the aspiration catheter 100 meet the requirements for passing through the heart.

[0063] In some optional embodiments, the aspiration catheter 10 further includes an outflow channel 300 connected to the proximal end of the aspiration tube 100, and the outflow channel 300 is provided with an outflow window 310 communicating with the aspiration outlet 163. In the intervention state, the outflow window 310 is located at a preset drainage position.

[0064] In some embodiments, the aspiration catheter 10 further includes an impeller 400 and a drive tube 500, the impeller 400 being located within the outflow channel 300. The drive tube 500 is connected to the proximal end of the outflow channel 300, and a shaft (not shown) is provided within the drive tube 500 for driving the impeller 400 to rotate. When the impeller 400 rotates, it drives blood and thrombi from the distal end of the aspiration catheter 100 into the aspiration channel 161. The filter 200 intercepts the thrombi within the aspiration channel 161, while the blood, after passing through the filter 200, flows back into the patient's blood vessel through the outflow window 310 on the outflow channel 300.

[0065] Figure 3 A schematic diagram of the structure of an example first sleeve is shown; Figure 4 A schematic diagram of an example outflow channel is shown; Figure 5 A front view schematic diagram of the structure of an example first sleeve is shown.

[0066] Combination Figures 1 to 5It is understood that the interventional device also includes a first connecting block 320 and a first sleeve 600 that are detachably connected. One of the first connecting block 320 and the first sleeve 600 is located on the outflow channel 300, and the other is located at the proximal end of the suction tube 100. The first sleeve 600 is provided with a first connecting groove 610 that extends along the maze path. When the first connecting block 320 is connected to the first sleeve 600, at least a portion of the first connecting block 320 is located within the maze path.

[0067] The maze path can be L-shaped, S-shaped, U-shaped, W-shaped, etc., to prevent the first connecting block 320 from easily detaching from the first connecting groove 610 and causing accidental separation of the outflow channel 300 and the suction tube 100 when the first connecting block 320 and the first sleeve 600 are connected. When it is necessary to separate the outflow channel 300 and the suction tube 100, the user can follow the maze path to bring the first connecting block 320 out of the first connecting groove 610.

[0068] In some embodiments, the maze path is an L-shaped path, and the first connecting groove 610 includes a first segment 611 extending from the proximal end to the distal end of the first sleeve 600 and a second segment 612 extending circumferentially along the first sleeve 600, with one end of the second segment 612 communicating with the distal end of the first segment 611. When the first connecting block 320 is connected to the first sleeve 600, at least a portion of the first connecting block 320 is located within the second segment 612.

[0069] In some embodiments, the first connecting block 320 protrudes from the outer peripheral surface of the outflow channel 300, and the first sleeve 600 is connected to the proximal end of the suction tube 100 by welding, adhesive bonding, or threading. The first segment 611 and the second segment 612 are arranged in an L-shape. When the first connecting block 320 is connected to the first sleeve 600, the first connecting block 320 extends from the first segment 611 into the first connecting groove 610 along the first direction x. When the first connecting block 320 is located at the connection between the first segment 611 and the second segment 612, the first connecting block 320 and the first sleeve 600 are rotated circumferentially, causing the first connecting block 320 to move from the first segment 611 into the second segment 612. At this time, the contour surface of the first sleeve 600 facing the second segment 612 restricts the movement of the first connecting block 320 along the first direction x, thereby realizing the connection between the first sleeve 600 and the first connecting block 320. When it is necessary to separate the first connecting block 320 from the first sleeve 600, the separation can be completed by reversing the connection operation.

[0070] It should be noted that the cross-sectional shapes of the suction tube 100 and the first sleeve 600 are both axisymmetric. Both the suction tube 100 and the first sleeve 600 have a central axis, and the direction of extension of the central axis is the first direction x in the figure. The cross-sectional shapes of the suction tube 100 and the first sleeve 600 can be circular or other axisymmetric shapes. When the suction tube 100 extends into the first passage 21 within the delivery sheath 20 along the first direction x, the central axis of the suction tube 100 is coaxial with the central axis of the delivery sheath 20. The first sleeve 600 has a cylindrical structure and therefore has two circumferential surfaces: the outer circumferential surface of the outer wall and the inner circumferential surface of the inner wall. The axial direction of the suction tube 100 and the first sleeve 600 refers to the direction in which the central axis extends; the circumferential direction refers to the circumferential direction of the outer perimeter of the cylinder; and the radial direction refers to the direction passing through the central axis in the radial plane, usually also referring to a straight line along the diameter or radius, or a straight line perpendicular to the central axis. Radial dimension generally refers to the radius or diameter of an axisymmetric part, while circumferential dimension generally refers to the circumference of an axisymmetric part. Since the suction channel 161 is formed by the suction tube 100, the radial dimension of the suction channel 161 is equal to the radial dimension of the inner circumferential surface of the suction tube 100. It is understood that in this application, the axial, circumferential, radial, and circumferential surfaces of other components can be referenced to the aforementioned descriptions of the suction tube 100 and the first sleeve 600.

[0071] In some embodiments, the second segment 612 includes a first sub-segment 613 and a second sub-segment 614, with the first sub-segment 613 connecting the second sub-segment 614 and the first segment 611. The first sleeve 600 also has a boss 620 protruding towards the first sub-segment 613, such that the width of the first sub-segment 613 is smaller than the width of the second segment 614. By providing the boss 620, when the first connecting block 320 enters the second sub-segment 614, the boss 620 can prevent the first connecting block 320 from returning from the second segment 612 to the first segment 611, thereby reducing the probability of accidental separation between the first connecting block 320 and the first sleeve 600.

[0072] In other embodiments, the first connecting groove 610 may be located directly on the suction tube 100.

[0073] In other embodiments, the first connecting groove 610 may be located on the outflow channel 300, and the first connecting block 320 may be located on the suction tube 100.

[0074] The intervention device provided in this application connects the suction tube 100 and the outflow channel 300 through the first connecting block 320 and the first sleeve 600, so that the suction tube 100 and the outflow channel 300 can be detachably connected, thereby facilitating rinsing and replacement of the filter element 200 and improving the service life of the suction tube 100.

[0075] Figure 6 A schematic diagram of an example suction cannula after partial straightening is shown; Figure 7 An example is shown. Figure 6 A schematic diagram of the longitudinal cross-sectional structure of the suction catheter in the image; Figure 8 This diagram illustrates the structure of an example second and third sleeve when they are separated. Figure 9 An enlarged schematic diagram of an example second sleeve is shown.

[0076] Combination Figures 6 to 9 It is known that the suction tube 100 includes a distal suction tube 110 and a proximal suction tube 120 arranged sequentially. The distal suction tube 110 and the proximal suction tube 120 together define the suction channel 161. The proximal suction tube 120 connects the distal suction tube 110 and the outflow channel 300.

[0077] In some embodiments, the suction tube 100 further includes a second sleeve 140 and a third sleeve 150 detachably connected, one of which is connected to the proximal end of the distal suction tube 110, and the other is connected to the distal end of the proximal suction tube 120. The second sleeve 140 is provided with a second connecting block 141, and the third sleeve 150 is provided with a second connecting groove 151 penetrating the third sleeve 150. When the second sleeve 140 and the third sleeve 150 are connected, at least a portion of the second connecting block 141 is located within the second connecting groove 151.

[0078] In the interventional state, the distal aspiration tube 110 passes through the intermediate transition zone from the preset aspiration position and is connected to the proximal aspiration tube 120 through the second sleeve 140 and the third sleeve 150. The proximal aspiration tube 120 extends from the intermediate transition zone to the preset drainage position. It can be understood that the first aspiration section 164, the second aspiration section 165, and the third aspiration section 166 are jointly constituted by the proximal aspiration tube 120 and the distal aspiration tube 110. It can also be understood that the first aspiration section 164, the second aspiration section 165, and the third aspiration section 166 are the specific forms of the aspiration tube 100 in an interventional state, while the proximal aspiration tube 120 and the distal aspiration tube 110 are two separate tubes connected by the second sleeve 140 and the third sleeve 150. In the interventional state, at least a portion of the first aspiration segment 164 is composed of the distal aspiration tube 110, at least a portion of the third aspiration segment 166 is composed of the proximal aspiration tube 120, and the second aspiration segment 165 may be composed of either the distal aspiration tube 110 or the proximal aspiration tube 120, or the second aspiration segment 165 may be composed of a portion of the distal aspiration tube 110 and a portion of the proximal aspiration tube 120.

[0079] When the second sleeve 140 and the third sleeve 150 are connected, the second sleeve 140 can be fitted over the third sleeve 150, or the third sleeve 150 can be fitted over the second sleeve 140. The second sleeve 140, the third sleeve 150 and the distal suction pipe 110 and the proximal suction pipe 120 can be connected by welding, gluing or threading.

[0080] In some embodiments, the second sleeve 140 is connected to the distal end of the proximal suction tube 120, and the third sleeve 150 is connected to the proximal end of the distal suction tube 110. A second connecting block 141 is disposed on the outer peripheral surface of the second sleeve 140. The second connecting block 141 includes a first peripheral surface 142 and a first inclined surface 143, with the first peripheral surface 142 and the outer peripheral surface of the second sleeve 140 spaced apart. The first inclined surface 143 connects the distal end of the first peripheral surface 142 and the outer peripheral surface of the second sleeve 140.

[0081] In some embodiments, the second connecting block 141 further includes a blocking surface connected to the proximal end of the first circumferential surface 142 and the outer circumferential surface of the second sleeve 140, and the blocking surface is perpendicular to the outer circumferential surface of the second sleeve 140. When the second sleeve 140 and the third sleeve 150 approach each other, the first inclined surface 143 abuts against the third sleeve 150 and expands the third sleeve 150, increasing the radial dimension of the inner circumferential surface of the third sleeve 150 until the second connecting block 141 extends into the second connecting groove 151, the first inclined surface 143 separates from the third sleeve 150, and the third sleeve 150 springs back. When the second sleeve 140 and the third sleeve 150 move in opposite directions along the first direction x, the blocking surface abuts against the contour surface of the second connecting groove 151, preventing the second sleeve 140 and the third sleeve 150 from separating along the first direction x.

[0082] In some embodiments, the second connecting block 141 further includes a second inclined surface 145, which connects the outer peripheral surfaces of the first circumferential surface 142 and the second sleeve 140. The second inclined surface 145 is located on at least one side of the first circumferential surface 142 in the circumferential direction. After the second sleeve 140 is connected to the third sleeve 150, the user can rotate the second sleeve 140 and the third sleeve 150 relative to each other in the circumferential direction, so that the second inclined surface 145 abuts against the contour surface of the second connecting groove 151 and expands the third sleeve 150, increasing the radial dimension of the inner peripheral surface of the third sleeve 150, until the second connecting block 141 leaves the second connecting groove 151. After that, the second sleeve 140 and the third sleeve 150 can be separated in the first direction x.

[0083] In some embodiments, a plurality of second connecting blocks 141 are arranged around the outer peripheral surface of the second sleeve 140 at intervals, and a plurality of second connecting grooves 151 corresponding one-to-one with the second connecting blocks 141 are provided on the third sleeve 150.

[0084] In other embodiments, the second sleeve 140 is connected to the proximal end of the distal suction tube 110, and the third sleeve 150 is connected to the distal end of the proximal suction tube 120. In this embodiment, the positions of the blocking surface and the first inclined surface 143 are interchanged, which will not be described further here.

[0085] In other embodiments, the distal inhalation tube 110 and the proximal inhalation tube 120 are connected by threads.

[0086] The interventional device provided in this application, by designing the suction tube 100 as a separate unit, allows the suction tube 100 to be disassembled for cleaning or replacement of the filter element 200 after the suction catheter 10 is withdrawn from the body, thereby improving the cleaning efficiency of the suction tube 100. By providing a second sleeve 140 and a third sleeve 150 between the distal suction tube 110 and the proximal suction tube 120, the distal suction tube 110 and the proximal suction tube 120 can be detachably connected, facilitating flushing and replacement of the filter element 200, and further extending the service life of the suction tube 100.

[0087] Figure 10 A schematic diagram of an example one-way valve is shown.

[0088] Combination Figures 6 to 10 It is understood that, in some optional embodiments, the filter element 200 is connected to at least one of the distal inhalation tube 110, the proximal inhalation tube 120, the second sleeve 140, and the third sleeve 150.

[0089] In some embodiments, the aspiration catheter 10 further includes a one-way valve 700 connected to the aspiration tube 100 and located within the aspiration channel 161, at the distal end of the filter element 200. The one-way valve 700 is used to ensure that blood and thrombi can only enter the aspiration channel 161 from the distal end and cannot flow out of the distal end of the aspiration channel 161.

[0090] In some embodiments, the filter element 200 is connected to the distal aspiration tube 110. In this embodiment, the thrombus is confined within the distal aspiration tube 110 by the filter element 200 and the one-way valve 700, while the proximal aspiration tube 120 remains free of thrombus. When the aspiration tube 100 is withdrawn for external cleaning, the distal aspiration tube 110 can be directly replaced, resulting in shorter cleaning time for the aspiration tube 100 and thus improving the aspiration efficiency of the interventional device.

[0091] In other embodiments, the filter element 200 is connected to the second sleeve 140. In this embodiment, the thrombus is also confined within the distal aspiration tube 110 by the filter element 200 and the one-way valve 700, while no thrombus remains in the proximal aspiration tube 120. When the aspiration tube 100 is withdrawn for external cleaning, after the second sleeve 140 separates from the third sleeve 150, the thrombus in the distal aspiration tube 110 can be directly emptied, followed by simple flushing for reassembly and secondary intervention. The cleaning time for the aspiration tube 100 is also shorter.

[0092] In other embodiments, the filter element 200 is connected to the distal end of the distal suction tube 110 and close to the one-way valve 700. In this embodiment, because the filter element 200 is very close to the one-way valve 700, the thrombus is only subjected to one compression and shaping process when it is aspirated into the suction channel 161, and is then collected by the filter element 200. However, when the filter element 200 is farther from the one-way valve 700, the thrombus is first subjected to compression and shaping by the one-way valve 700 when it is aspirated into the suction channel 161, and then by compression and shaping by the mesh of the filter element 200. This embodiment, where the thrombus is subjected to multiple compression and shaping processes, requires a higher suction force. Therefore, this embodiment can reduce the lower limit of the suction force required for the suction catheter 10.

[0093] After describing several implementations of the suction tube 100, several implementations of the filter element 200 will be described below with reference to the accompanying drawings. Figure 11 A schematic diagram of an example connection part is shown.

[0094] Combination Figure 11 As can be seen, the filter element 200 includes a connecting part 210 and a filter screen (not shown) disposed on the connecting part 210, and the connecting part 210 is connected to the suction tube 100. The connecting part 210 and the filter screen are either integrally connected or detachably connected.

[0095] In some embodiments, the filter screen includes a mesh and a plurality of mesh openings formed by the mesh. The connecting part 210 is an annular clamp. The mesh is woven from multiple interlaced mesh lines, which are welded or bonded to the connecting part 210. The connecting part 210 is also welded or bonded to the suction tube 100. The connecting part 210 is used to fix the mesh lines, preventing the mesh lines from falling off and causing the mesh openings to enlarge, thus preventing thrombus leakage.

[0096] In some embodiments, the mesh includes a central portion and an outer peripheral portion surrounding the central portion, with the aperture of the mesh holes on the outer peripheral portion being smaller than that on the central portion. Alternatively, the aperture of the mesh holes gradually decreases in the direction toward the connecting portion 210. By making the mesh holes on the outer peripheral side denser than those on the central side, the interaction force between the mesh lines on the outer peripheral side is increased, thus preventing the mesh lines from falling off.

[0097] In some embodiments, the material of the connector 210 includes metal. The material of the filter screen includes polyethylene terephthalate or polypropylene.

[0098] Figure 12 A partial longitudinal cross-sectional view of an example delivery sheath is shown.

[0099] Combination Figure 12 In addition to the above, this application also provides an interventional device, including a delivery sheath 20 and a suction conduit 10 as described in any of the first aspects of the embodiment above. The delivery sheath 20 has a first passage 21 inside. The suction conduit 10 includes a suction tube 100 and a filter element 200. The suction tube 100 includes a tube body 160, and a suction channel 161, a suction inlet 162, and a suction outlet 163 are formed within the tube body 160. The suction inlet 162 and the suction outlet 163 are respectively connected to the suction channel 161. The filter element 200 is disposed within the suction channel 161 and is located between the suction inlet 162 and the suction outlet 163. The interventional device includes an interventional state in which at least a portion of the aspiration catheter 10 is located within the first passage 21, and the aspiration outlet 163 extends into the first passage 21 from the proximal end of the delivery sheath 20 and extends out of the first passage 21 from the distal end of the delivery sheath 20. The aspiration inlet 162 is located at a preset aspiration position, the aspiration outlet is located at a preset drainage position, and the tube body 160 extends from the preset aspiration position through an intermediate transition zone to the preset drainage position.

[0100] In some embodiments, the aspiration catheter 10 further includes an impeller 400 and a drive tube 500, the impeller 400 being located within the outflow channel 300. The drive tube 500 is connected to the proximal end of the outflow channel 300, and a shaft (not shown) is provided within the drive tube 500 for driving the impeller 400 to rotate. When the impeller 400 rotates, it drives blood and thrombi from the distal end of the aspiration catheter 100 into the aspiration channel 161. The filter 200 intercepts the thrombi within the aspiration channel 161, while the blood, after passing through the filter 200, flows back into the patient's blood vessel through the outflow window 310 on the outflow channel 300.

[0101] In some embodiments, the interventional device further includes a second state and a separated state, in which at least a portion of the aspiration catheter 10 is located within the first passage 21 and the outflow window 310 is covered by the delivery sheath 20. In the separated state, the delivery sheath 20 and the aspiration catheter 10 are separated relative to each other.

[0102] During the use of the interventional device, the device is initially in a disassembled state. A guidewire is used to insert the delivery sheath 20 through the patient's femoral vein to the designated location. The guidewire is then withdrawn, leaving the delivery sheath 20 in the patient's body. Next, the aspiration catheter 10 is inserted through the first passage 21 of the delivery sheath 20. During the intervention, contrast agent and DSA (digital subtraction angiography) are used to determine the insertion position of the aspiration catheter 10 until the distal end of the aspiration catheter 100 is close to the thrombus. At this point, the interventional device is in a second state, with the delivery sheath 20 covering the outflow window 310. The delivery sheath 20 is then retracted proximally a short distance, exposing the outflow window 310 from the first passage 21, returning the interventional device to its first state and initiating thrombus aspiration. The filter 200 intercepts the thrombus within the aspiration channel 161, while the blood, after passing through the filter 200, flows back into the patient's blood vessel through the outflow window 310 on the outflow channel 300. When the aspiration catheter 10 is full of thrombus, the delivery sheath 20 is inserted further distally to cover the outflow window 310 again. When the interventional device switches back to the second state, the aspiration catheter 10 is withdrawn from the body for thrombus removal or replacement of the aspiration tube 100. This process is then repeated for a second intervention with the aspiration catheter 10 and thrombus aspiration. Once thrombus aspiration is complete, the aspiration catheter 10 and delivery sheath 20 are withdrawn sequentially, and the wound is sutured.

[0103] It is understood that the delivery sheath 20 has a certain degree of elasticity, so that when the aspiration catheter 10 is inserted into the delivery sheath 20, the delivery sheath 20 will wrap around the aspiration catheter 10. This application does not specifically limit the cross-section of the delivery sheath 20 in its natural state. Any cross-sectional form of the delivery sheath 20 that can guarantee the wrapping effect is within the protection scope of this application, and this application does not make specific limitations on it. The aspiration tube 100 also has a certain degree of elasticity, and its elasticity is greater than that of the delivery sheath 20. When the aspiration catheter 10 aspirates thrombi at the pulmonary artery, the distal end of the delivery sheath 20 and the outflow channel 300 can remain at the confluence of the superior vena cava and the inferior vena cava, while the more elastic aspiration tube 100 bends and extends and passes through the right atrium and the right ventricle in sequence, finally placing the distal suction port 110 of the aspiration tube 100 in the preset suction position, i.e., in the pulmonary artery. This not only allows the more rigid outflow channel 300 and delivery sheath 20 to be used without intervening in the heart, reducing the difficulty of intervention, but also allows the blood flowing out of the second pathway from the outflow window 310 to mix with venous blood in the superior vena cava and inferior vena cava before entering the heart, avoiding direct impact on the heart and causing excessive load on the right ventricle.

[0104] The interventional device provided in this application includes an outflow channel 300, a suction tube 100, and a filter 200. When thrombus and blood are drawn into the suction channel 161 from the distal end of the suction tube, the filter 200 intercepts the thrombus within the suction channel 161, while the blood flows back into the patient's blood vessel through the outflow window 310 on the outflow channel 300 after passing through the filter, thereby reducing the amount of blood loss in the patient during thrombus aspiration. By including a delivery sheath 20 in the interventional device, a stable pathway can be established after intervention, allowing the aspiration catheter 10 to be inserted through the first pathway 21 to a designated location. At this point, the interventional device is in its first state, with the outflow window 310 located outside the first pathway 21, and the aspiration catheter 10 can normally aspirate thrombi. When the aspiration catheter 10 is full of thrombi, it can be withdrawn for cleaning or replacement, while the delivery sheath 20 remains at the interventional position. This facilitates subsequent secondary intervention with the aspiration catheter, eliminating the need for guidewire re-intervention, simplifying the thrombus aspiration process, improving the aspiration efficiency of the interventional device, and reducing the need for multiple guidewire interventions, thus lowering the probability of hemoptysis. By extending the delivery sheath 20 further distally before withdrawing the aspiration catheter 10, it is easier for the aspiration catheter 10 to accurately return to its previous position upon re-intervention, reducing positioning steps and further improving the aspiration efficiency of the interventional device.

[0105] Figure 13 A flowchart illustrating an example thrombectomy training method is shown.

[0106] Combination Figure 13 As can be seen, in addition to the above, this application also provides a thrombectomy training method, based on the aspiration catheter 10 in any of the first aspect embodiments above. The thrombectomy training method is used to remove thrombi from the pulmonary artery. The training method is applied to a human body model, which contains a simulated heart and simulated blood vessels. The simulated blood vessels include the femoral vein, superior vena cava, inferior vena cava, and pulmonary artery, forming a closed circulatory loop between the simulated heart and the simulated blood vessels. A colored liquid is injected into the simulated blood vessels to simulate blood, and hydrogel is filled into the pulmonary artery to simulate a thrombus.

[0107] The thrombectomy training method includes the following steps:

[0108] Step S01: Through femoral vein puncture, guidewire and delivery sheath 20 are sequentially passed through the femoral vein, inferior vena cava, right atrium of the simulated heart, and right ventricle of the simulated heart before being pushed to the preset aspiration position, which is the pulmonary artery.

[0109] It is understood that, in this application, pushing a component to a preset suction position means that a preset part of the component is in a preset relative position to the preset suction position. For example, pushing a guidewire to a preset suction position can mean pushing the guidewire until its distal end is relative to the preset suction position. As another example, pushing a delivery sheath 20 to a preset suction position can mean pushing the delivery sheath 20 until its distal end is relative to the preset suction position. Such concepts will not be further defined below.

[0110] Step S02: Remove the guide wire and sheath core, leaving the delivery sheath 20 in the preset suction position.

[0111] Step S03: Push the suction catheter 10 along the delivery sheath 20 to the preset suction position.

[0112] Step S04: The delivery sheath 20 is retracted to the preset drainage position, so that the delivery sheath 20 is exposed at the suction outlet 163 of the suction tube 100. The preset drainage position is located at the junction of the inferior vena cava and the superior vena cava.

[0113] It is understood that, corresponding to pushing to the preset suction position, retracting a component to the preset discharge position means that a preset part of the component is in a preset relative position to the preset discharge position. For example, retracting the delivery sheath 20 to the preset discharge position can mean retracting the delivery sheath 20 until its distal end is located around the preset discharge position, exposing the suction outlet so that the suction outlet is relative to the preset discharge position. This concept will not be further defined below.

[0114] In some implementations, the thrombectomy training method further includes:

[0115] Step S05: Push the delivery sheath 20 back to the preset suction position.

[0116] Step S06: Remove the aspiration catheter 10 and clear any blood clots from the aspiration catheter 10.

[0117] Step S07: Push the suction catheter 10 back along the delivery sheath 20 to the preset suction position.

[0118] In step S08, the delivery sheath 20 is retracted to the preset drainage position, so that the delivery sheath 20 is exposed at the suction outlet 163 of the suction tube 100.

[0119] The thrombectomy training method provided in this application allows the aspiration catheter 10 to be withdrawn from the body for cleaning or replacement when it is full of thrombus, while the delivery sheath 20 remains in the interventional position. This facilitates subsequent re-intervention of the aspiration catheter 10 without the need for guidewire re-intervention, simplifying the thrombus aspiration process and improving the aspiration efficiency of the interventional device. It also reduces the need for multiple guidewire interventions, lowering the probability of hemoptysis in patients. Furthermore, by inserting the delivery sheath 20 distally a certain distance before withdrawing the aspiration catheter 10, it is easier for the aspiration catheter 10 to accurately return to its previous position upon re-intervention, reducing positioning steps and further improving the aspiration efficiency of the interventional device. By positioning the aspiration inlet 162 and aspiration outlet 163 of the aspiration catheter 10 in the interventional state at preset aspiration and drainage positions, respectively, both outside the intermediate transition zone and located on opposite sides of it, the direct impact of reduced blood flow outside the preset aspiration position on the intermediate transition zone is reduced when the aspiration inlet 162 aspirates blood and thrombi at the preset aspiration position. This reduces the load on the intermediate transition zone caused by the aspiration catheter 10. Similarly, when the aspiration outlet 163 drains blood at the preset drainage position, the direct impact of the drained blood on the intermediate transition zone is reduced, further decreasing the load on the intermediate transition zone caused by the aspiration catheter 10.

[0120] In some embodiments, after the delivery sheath 20 retracts to the preset drainage position in steps S04 and S08, the outflow window 310 on the outflow channel 300 will be exposed, so that the delivery sheath 20 will not obstruct the blood outflow at the outflow window 310.

[0121] In addition, this application also provides a thrombectomy training system, including a human body model, a delivery sheath 20, and a suction catheter 10 as described in any of the first aspect embodiments above. The human body model contains a simulated heart and simulated blood vessels, including the femoral vein, superior vena cava, inferior vena cava, and pulmonary artery, forming a closed circulatory loop between the simulated heart and the simulated blood vessels. A colored liquid is injected into the simulated blood vessels to simulate blood, and hydrogel is filled into the pulmonary artery to simulate a thrombus.

[0122] The thrombectomy training system includes an interventional state, a second state, and a separation state. In the interventional state, the delivery sheath 20 is punctured through the femoral vein, sequentially passing through the femoral vein, inferior vena cava, the right atrium of the simulated heart, and the right ventricle of the simulated heart before being pushed to the preset aspiration position, which is the pulmonary artery. At least a portion of the aspiration catheter 10 is located within the first access channel 21, and the aspiration outlet 163 extends into the first access channel 21 from the proximal end of the delivery sheath 20 and extends out of the first access channel 21 from the distal end of the delivery sheath 20. The aspiration inlet 162 is located at the preset aspiration position, the aspiration outlet 163 is located at the preset drainage position, and the tube body 160 extends from the preset aspiration position through an intermediate transition zone to the preset drainage position.

[0123] In the second state, the suction inlet 162 remains in the preset suction position, and the suction outlet 163 remains in the preset drainage position. At least part of the suction catheter 10 is located within the first passage 21, and the outflow window 310 is covered by the delivery sheath 20.

[0124] In the separated state, the distal end of the delivery sheath 20 is located at the preset suction position, the delivery sheath 20 and the suction catheter 10 are separated from each other, and the suction catheter 10 is retracted outside the human body model.

[0125] In some alternative implementations, the thrombectomy training aspect, as described in any of the third aspect embodiments above, can be used in the thrombectomy training system of this embodiment.

[0126] The thrombectomy training system provided in this application allows the aspiration catheter 10 to be withdrawn from the body for cleaning or replacement when it is full of thrombus, while the delivery sheath 20 remains in the interventional position. This facilitates subsequent re-intervention of the aspiration catheter 10 without the need for guidewire re-intervention, simplifying the thrombus aspiration process and improving the aspiration efficiency of the interventional device. It also reduces the need for multiple guidewire interventions, lowering the probability of hemoptysis in patients. By inserting the delivery sheath 20 further distally before withdrawing the aspiration catheter 10, it is easier for the aspiration catheter 10 to accurately return to the previous interventional position upon re-intervention, reducing positioning steps and further improving the aspiration efficiency of the interventional device. By positioning the aspiration inlet 162 and aspiration outlet 163 of the aspiration catheter 10 in the interventional state at preset aspiration and drainage positions, respectively, both outside the intermediate transition zone and located on opposite sides of it, the direct impact of reduced blood flow outside the preset aspiration position on the intermediate transition zone is reduced when the aspiration inlet 162 aspirates blood and thrombi at the preset aspiration position. This reduces the load on the intermediate transition zone caused by the aspiration catheter 10. Similarly, when the aspiration outlet 163 drains blood at the preset drainage position, the direct impact of the drained blood on the intermediate transition zone is reduced, further decreasing the load on the intermediate transition zone caused by the aspiration catheter 10.

[0127] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A suction catheter, characterized in that, include: A suction tube, comprising a tube body, wherein a suction channel, a suction inlet, and a suction outlet are formed within the tube body, and the suction inlet and the suction outlet are respectively connected to the suction channel; A filter element is disposed within the suction channel and located between the suction inlet and the suction outlet; In the intervention state, the suction inlet is located at the preset suction position, the suction outlet is located at the preset drainage position, and the tube extends from the preset suction position through the intermediate transition zone to the preset drainage position.

2. The aspiration catheter according to claim 1, characterized in that, Along the axial direction of the suction tube, the tube body includes a first suction section, a second suction section, and a third suction section arranged sequentially. The first suction section, the second suction section, and the third suction section together define the suction channel. The suction inlet and the suction outlet are located in the first suction section and the third suction section, respectively. In the intervention state, the angle between the extension direction of the first suction section and the extension direction of the second suction section is an acute angle, and the angle between the extension direction of the second suction section and the extension direction of the third suction section is an acute angle.

3. The aspiration catheter according to claim 2, characterized in that, The axial lengths of the first suction section, the second suction section, and the third suction section are all greater than or equal to 5 mm and less than or equal to 60 mm.

4. The aspiration catheter according to claim 1, characterized in that, The aspiration catheter is used to aspirate thrombi. The preset aspiration location is the pulmonary artery, the preset drainage location is the junction of the inferior vena cava and the superior vena cava, and the intermediate transition zone is the right ventricle and the right atrium.

5. The aspiration catheter according to claim 1, characterized in that, It also includes an outflow channel connected to the proximal end of the suction tube, the outflow channel having an outflow window communicating with the suction outlet, and in the intervention state, the outflow window being located at a preset drainage position.

6. The aspiration catheter according to claim 5, characterized in that, It also includes a first connecting block and a first sleeve that are detachably connected, one of which is located on the outflow channel and the other is located at the proximal end of the suction tube; The first sleeve is provided with a first connecting groove, which extends along the maze path. When the first connecting block is connected to the first sleeve, at least a portion of the first connecting block is located within the maze path.

7. The aspiration catheter according to claim 1, characterized in that, Along the axial direction of the suction tube, the tube body includes a distal suction tube and a proximal suction tube arranged in sequence, the distal suction tube and the proximal suction tube together define the suction channel, and the suction inlet and the suction outlet are located in the distal suction tube and the proximal suction tube, respectively. The suction tube also includes a second sleeve and a third sleeve that are detachably connected, one of the second sleeve and the third sleeve being connected to the proximal end of the distal suction tube and the other being connected to the distal end of the proximal suction tube. The second sleeve is provided with a second connecting block, and the third sleeve is provided with a second connecting groove that penetrates the third sleeve. When the second sleeve is connected to the third sleeve, at least part of the second connecting block is located in the second connecting groove. In the intervention state, the distal aspiration tube passes through the intermediate transition zone from the preset aspiration position and is connected to the proximal aspiration tube through the second sleeve and the third sleeve. The proximal aspiration tube extends from the intermediate transition zone to the preset drainage position.

8. The aspiration catheter according to claim 7, characterized in that, The second sleeve is connected to the distal end of the proximal inhalation tube, and the third sleeve is connected to the proximal end of the distal inhalation tube; the second connecting block is disposed on the outer peripheral surface of the second sleeve, and the second connecting block includes a first peripheral surface, a first inclined surface and a second inclined surface, the first peripheral surface and the outer peripheral surface of the second sleeve are spaced apart, the first inclined surface connects the distal end of the first peripheral surface and the outer peripheral surface of the second sleeve; the second inclined surface connects the first peripheral surface and the outer peripheral surface of the second sleeve, and the second inclined surface is located on at least one side of the first peripheral surface in the circumferential direction.

9. The aspiration catheter according to claim 1, characterized in that, It also includes a one-way valve, which is located in the suction channel and at the far end of the filter element.

10. An interventional device, characterized in that, include: The delivery sheath has a first passage inside; A suction conduit includes a suction tube and a filter element. The suction tube includes a tube body, and a suction channel, a suction inlet, and a suction outlet are formed within the tube body. The suction inlet and the suction outlet are respectively connected to the suction channel. The filter element is disposed within the suction channel and located between the suction inlet and the suction outlet. The interventional device includes an interventional state in which at least a portion of the aspiration catheter is located within the first passage, and the aspiration outlet extends into the first passage from the proximal end of the delivery sheath and extends out of the first passage from the distal end of the delivery sheath. The aspiration inlet is located at a preset aspiration position, the aspiration outlet is located at a preset drainage position, and the tube body extends from the preset aspiration position through an intermediate transition zone to the preset drainage position.

11. A thrombectomy training system, comprising a human model, a delivery sheath, and a suction catheter as described in any one of claims 1 to 9, wherein the human model contains a simulated heart and simulated blood vessels, the simulated blood vessels including a femoral vein, superior vena cava, inferior vena cava, and pulmonary artery, and a closed circulatory loop is formed between the simulated heart and the simulated blood vessels; a colored liquid is injected into the simulated blood vessels to simulate blood, and hydrogel is filled into the pulmonary artery to simulate a thrombus; characterized in that, The thrombectomy training system includes an interventional state, a second state, and a separation state. In the interventional state, the delivery sheath is punctured through the femoral vein and sequentially passes through the femoral vein, the inferior vena cava, the right atrium of the simulated heart, and the right ventricle of the simulated heart before being pushed to a preset aspiration position, which is the pulmonary artery. At least a portion of the aspiration catheter is located within the first pathway, and the aspiration outlet extends into the first pathway from the proximal end of the delivery sheath and extends out of the first pathway from the distal end of the delivery sheath. The aspiration inlet is located at the preset aspiration position, the aspiration outlet is located at the preset drainage position, and the tube body extends from the preset aspiration position through an intermediate transition zone to the preset drainage position. In the second state, the suction inlet is still located at the preset suction position, the suction outlet is still located at the preset drainage position, at least part of the suction conduit is located in the first passage, and the outflow window is covered by the delivery sheath. In the separated state, the distal end of the delivery sheath is located at the preset suction position, the delivery sheath and the suction catheter are separated relative to each other, and the suction catheter is retracted outside the human body model.

Images