Aspiration catheter, aspiration system, and thrombectomy training method

Abstract

Provided are an aspiration catheter, an aspiration system, and a thrombectomy training method, wherein the aspiration catheter forms an internal flow channel extending in an axial direction, and the aspiration catheter comprises an aspiration tube (100), an outflow tube (330), and a filter member (200). The aspiration tube (100) comprises a first connection section (110) and a second connection section (120) arranged in the axial direction; the internal flow channel is in communication with the first connection section (110), the second connection section (120), and the outflow tube (330) in the axial direction; the filter member (200) is arranged in the internal flow channel; the aspiration tube (100) forms an aspiration inlet (101); the outflow tube (330) forms an outflow window (310); the internal flow channel is in communication with the aspiration inlet (101) and the outflow window (310); and at least one of connection joints of the first connection section (110), the second connection section (120), and the outflow tube (330) is a detachable connection.

Description

Aspiration catheters, aspiration systems, and thrombectomy training methods

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese Patent Application No. 2024103744017, filed on March 29, 2024, entitled “An Intravascular Thrombus Aspiration Catheter,” the entire contents of which are incorporated herein by reference. This application claims priority to Chinese Patent Application No. 2024119989989, filed on December 31, 2024, entitled “Aspiration Catheter, Interventional Device, and Thrombectomy Training Method,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application belongs to the field of medical devices, and in particular relates to a suction catheter, a suction system, and a thrombectomy training method. Background Art

[0004] After forming, a thrombus can easily break off and travel with the bloodstream, partially or completely blocking certain blood vessels as it moves, causing ischemia, hypoxia, and necrosis of the corresponding tissues and / or organs. The severity of thromboembolism is related to the location and duration of the embolism.

[0005] At present, the main treatments for thrombotic diseases include: anticoagulant, antithrombotic, thrombolytic and other drug treatments, surgical treatment and interventional treatment. Among them, anticoagulant, antithrombotic, thrombolytic and other drug treatments require medication for the entire blood circulation system, with large dosages, slow effects, and the potential to cause complications such as organ bleeding. For patients with old thrombosis that have poor responses to medical treatment and poor collateral circulation, surgical treatment can be considered, that is, surgical removal of the thrombus or resection of the embolized blood vessel segment and re-anastomosis. Interventional treatment involves local thrombolysis through a catheter, low-pressure aspiration of the thrombus through a catheter, and mechanical thrombectomy using devices such as balloons and stents.

[0006] In the existing technology, the treatment of thrombosis needs to be improved. Summary of the Invention

[0007] The embodiments of the present application provide an aspiration catheter, an aspiration system, and a thrombectomy training method, which can improve the convenience of using the aspiration catheter.

[0008] On the one hand, a suction duct is provided, which is formed with an internal flow channel extending in an axial direction, and the suction duct includes a first connecting section and a second connecting section arranged in the axial direction; the internal flow channel passes through the first connecting section, the second connecting section and the outflow pipe in the axial direction; the filter element is arranged in the internal flow channel; the suction pipe is formed with a suction inlet, and the outflow pipe is formed with an outflow window, the internal flow channel connects the suction inlet and the outflow window, and at least one of the connections between the first connecting section, the second connecting section and the outflow pipe includes a detachable connection.

[0009] In some embodiments of the present application, the filter element is disposed in an inner flow channel corresponding to the suction tube.

[0010] In some embodiments of the present application, the outflow tube is detachably connected to the second connecting section.

[0011] In some embodiments of the present application, the suction catheter further includes a drive assembly, which is at least partially installed in the outflow tube and is used to form a negative pressure in the inner flow channel.

[0012] In some embodiments of the present application, the driving assembly includes an impeller mechanism, and the outflow window is opened in the circumference of the outflow pipe; along the axial direction, at least a portion of the impeller mechanism is arranged opposite to the outflow window.

[0013] In some embodiments of the present application, the suction tube also includes a first sleeve, which is provided with a first connecting groove; the suction tube also includes a first connecting block, one of the first connecting block and the first sleeve is connected to the outflow pipe, and the other is connected to the second connecting section. When the second connecting section is connected to the outflow pipe, the first connecting block is accommodated in the first connecting groove to limit the movement of the outflow pipe relative to the suction tube.

[0014] In some embodiments of the present application, the first connecting groove penetrates the wall thickness of the first sleeve, and the first connecting groove includes a first section and a second section, the first section extends along the axial direction, the second section extends along the circumferential direction of the first sleeve, and the end of the first section facing away from the outflow window is connected to one end of the second section; the axial dimension of the middle part of the second section is smaller than the axial dimensions on both sides of the middle part, and the first connecting block is placed on the side of the middle part of the second section facing away from the first section.

[0015] In some embodiments of the present application, the first connecting section and the second connecting section are detachably connected.

[0016] In some embodiments of the present application, the suction tube further includes a connecting assembly, the connecting assembly including a second sleeve and a third sleeve arranged along the axial direction, the second sleeve being connected to the first connecting section, and the third sleeve being connected to the second connecting section;

[0017] The second sleeve includes a clamping section and a first sealing section connected along the axial direction, the first sealing section is arranged on the side of the clamping section facing away from the suction inlet, and the clamping section is provided with a plurality of second connecting blocks along the circumference of the second sleeve; the third sleeve includes a plurality of second connecting grooves arranged along its own circumference, the second connecting blocks are placed in the second connecting grooves, a portion of the filter element is placed in the third sleeve, and a portion of the filter element abuts against the third sleeve through the first sealing section.

[0018] In some embodiments of the present application, the connecting assembly is placed at an end of the suction tube facing away from the outflow tube.

[0019] In some embodiments of the present application, the first connecting segment and the second connecting segment partially overlap along the axial direction, and the first connecting segment includes a first body segment, a second sealing segment, and a first fastening segment arranged in sequence along the axial direction; the second connecting segment includes a second body segment, a second fastening segment, and a third sealing segment arranged in sequence along the axial direction, the third sealing segment is placed in the second sealing segment and is interference-connected with the second sealing segment, and the second fastening segment is threadedly connected to the first fastening segment.

[0020] In some embodiments of the present application, the outer diameter of the first body segment has a gradually shrinking trend from the second sealing segment toward the suction inlet.

[0021] In some embodiments of the present application, the first connecting segment includes a first main body segment, and the first main body segment includes an outer layer, an intermediate layer and an inner layer stacked in a radial direction, and the intermediate layer is placed between the outer layer and the inner layer; the outer layer includes a medical polymer material, the intermediate layer includes metal, and the friction coefficient of the inner layer is 0.01 to 0.1.

[0022] In some embodiments of the present application, the hardness of the first connecting segment decreases from the second connecting segment to the first connecting segment.

[0023] In some embodiments of the present application, the suction catheter further includes a one-way valve, which is disposed on a side of the filter element facing away from the outflow window and is at least partially disposed in the inner flow channel.

[0024] In some embodiments of the present application, the suction duct further includes a tightening member, which is connected to the suction tube. The tightening member is located on the side of the filter element facing away from the outflow window. The tightening member includes a tightening body, which protrudes inward along the radial direction of the suction duct relative to the axis of the suction tube to form a tightening channel, and the tightening channel is connected to the internal flow channel.

[0025] In some embodiments of the present application, the tightening body includes a first end and a second end, the tightening channel has a gradual contraction along a first direction, and the first end is arranged between the second end and the filter element, wherein the first direction extends from the first end to the second end.

[0026] In some embodiments of the present application, the tightening member is arranged at the suction inlet, and along the axial direction of the tightening channel, the second end is located on the side of the suction inlet facing away from the filter element, and the outer diameter of the tightening body tends to gradually shrink along the first direction.

[0027] In some embodiments of the present application, the tightening body includes a transition portion and a tightening portion distributed successively along the axial direction of the tightening channel, the transition portion is placed between the tightening portion and the filter element, the transition portion is placed in the internal flow channel, and the transition portion is connected to the suction tube; the tightening portion includes the first end and the second end, along the first direction, the outer diameter of the tightening portion has a gradual shrinking trend, and the first end is connected to the transition portion.

[0028] In some embodiments of the present application, the tightening body includes a first end and a second end, and the tightening channel has a gradual expansion trend along a first direction, wherein the first direction extends from the first end to the second end; the circumferential side of the tightening body is connected to the suction tube, and along the axial direction of the tightening channel, the first end is located between the second end and the filter element.

[0029] In some embodiments of the present application, the suction tube is flexible and bendable, and the suction catheter includes an intervention state. In the intervention state, along the axial direction, the suction tube includes a first suction segment, a second suction segment and a third suction segment arranged in sequence, and the first suction segment, the second suction segment and the third suction segment jointly define a suction channel, the suction inlet is located in the first suction segment, and the suction outlet of the third suction segment is connected to the outflow tube; the angle between the extension direction of the first suction segment and the extension direction of the second suction segment is an acute angle, and the angle between the extension direction of the second suction segment and the extension direction of the third suction segment is an acute angle.

[0030] In some embodiments of the present application, the suction catheter is used to aspirate thrombus. In the interventional state, the suction inlet is located in the pulmonary artery, the suction outlet is located at the junction of the inferior vena cava and the superior vena cava, and the first suction segment, the second suction segment and the third suction segment are at least partially located in the right ventricle and right atrium.

[0031] In some embodiments of the present application, in the interventional state, the suction inlet is located at the pulmonary artery, and the outflow window is located at the junction of the inferior vena cava and the superior vena cava.

[0032] On the other hand, some embodiments of the present application further provide a suction system comprising the above-mentioned suction catheter.

[0033] On the other hand, some embodiments of the present application also provide a thrombectomy training method based on the above-mentioned suction catheter, including: the thrombectomy training method is used to clear the thrombus in the pulmonary artery; the training method is applied to a human model, and a simulated heart and simulated blood vessels are provided inside the human model, and the simulated blood vessels include the femoral vein, superior vena cava, inferior vena cava and pulmonary artery, and a closed circulation 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 a hydrogel is filled into the pulmonary artery to simulate a thrombus; the thrombectomy training method includes the following steps: through femoral vein puncture, the delivery sheath is delivered through the femoral vein, inferior vena cava, right atrium of the simulated heart, and right ventricle of the simulated heart to the thrombus site in the pulmonary artery; the suction catheter is passed along the delivery sheath, so that the suction inlet of the suction catheter reaches the thrombus site in the pulmonary artery, and the outflow window of the suction catheter is placed at the intersection of the inferior vena cava and the superior vena cava; the delivery sheath is withdrawn until the outflow window of the suction catheter is exposed.

[0034] In some embodiments of the present application, the thrombus removal training method further includes: re-pushing the delivery sheath to the suction inlet;

[0035] The suction catheter is withdrawn and the thrombus in the suction catheter is cleared; the suction catheter is pushed along the delivery sheath to the thrombus again; and the delivery sheath is withdrawn again until the outflow window is exposed.

[0036] The aspiration catheter, aspiration system, and thrombectomy training method of the embodiments of the present application achieve ease of use by utilizing a detachable connection at least one of the connections between the first connecting segment, the second connecting segment, and the outflow tube. When the first connecting segment needs to be replaced to accommodate a different blood vessel size, the first and second connecting segments can be detachably connected. When convenient maintenance of the drive assembly is required, the second connecting segment and the drive assembly can be detachably connected.

[0037] In the first aspect of the present disclosure, an intravascular thrombus aspiration catheter is provided, comprising: an internal flow channel, a distal aspiration catheter segment, an intermediate catheter segment and a proximal drive catheter segment, wherein the internal flow channel sequentially connects the distal aspiration catheter segment, the intermediate catheter segment and the proximal drive catheter segment from the distal end to the proximal end of the intravascular thrombus aspiration catheter, wherein the intravascular thrombus aspiration catheter further comprises a suction inlet and an outflow window, and the internal flow channel connects the suction inlet and the outflow window; a filter is provided in the internal flow channel of the intermediate catheter segment; the suction inlet, the filter and the outflow window are sequentially provided from the distal end to the proximal end of the intravascular thrombus aspiration catheter; one or more sections of the internal flow channel of the intermediate catheter segment are configured as a detachable structure, and the suction inlet is provided on the distal aspiration catheter segment.

[0038] Furthermore, in some embodiments, an impeller is provided in the inner flow channel of the proximal driving catheter segment; the impeller is provided at the outflow window, or the outflow window is provided closer to the proximal end of the intravascular thrombus aspiration catheter than the impeller.

[0039] Further, in some embodiments, one or more sections of the internal flow channel of the intermediate catheter segment are configured to be detachable, including: the distal suction catheter segment is detachably connected to the intermediate catheter segment, and / or the intermediate catheter segment is detachably connected to the proximal drive catheter segment.

[0040] Furthermore, in some embodiments, the detachable connection between the distal suction catheter segment and the intermediate catheter segment is a sealed connection with an interference fit.

[0041] Furthermore, in some embodiments, the detachable connection between the distal suction catheter segment and the intermediate catheter segment further includes a threaded connection.

[0042] Furthermore, in some embodiments, the distal suction catheter segment is constructed into a tapered structure that is thin at the distal end and gradually becomes thick at the proximal end.

[0043] Furthermore, in some embodiments, the hardness of the distal end to the proximal end of the distal suction catheter segment changes in a step-like manner, wherein the distal end of the distal suction catheter segment is softer than the proximal end thereof.

[0044] Furthermore, in some embodiments, the above-mentioned distal suction catheter segment also includes a suction distal segment, a suction middle segment and a suction proximal segment, and the above-mentioned suction distal segment, the above-mentioned suction middle segment and the above-mentioned suction proximal segment are connected in sequence from the distal end to the proximal end of the above-mentioned distal suction catheter segment, wherein the hardness of the above-mentioned suction distal segment is 25D, the hardness of the above-mentioned suction middle segment is 35D to 55D, and the hardness of the above-mentioned suction proximal segment is 63D.

[0045] Furthermore, in some embodiments, the distal suction catheter segment is constructed into a multi-layer composite structure, wherein the multi-layer composite structure includes an outer layer, an intermediate layer and an inner layer, the outer layer is constructed to be made of a medical polymer material, the inner layer is constructed to be made of a material with a friction coefficient of 0.01 to 0.1, and the intermediate layer is constructed to be made of a metallic reinforced material.

[0046] Furthermore, in some embodiments, the outer layer is constructed to be made of one or more of pebax, tpu, and nylon, the inner layer is constructed to be made of PTFE, and the middle layer is constructed to be made of nickel-titanium alloy or stainless steel.

[0047] Furthermore, in some embodiments, surfaces of the outer layer and the inner layer in contact with the intermediate layer are constructed with an etching layer.

[0048] Furthermore, in some embodiments, the intermediate layer is configured in a spiral or braided shape, and the intermediate layer is fixed between the inner layer and the outer layer through a reflow process.

[0049] Furthermore, in some embodiments, a developing ring is provided at a position 1 to 10 mm away from the distal end of the distal suction catheter segment.

[0050] Furthermore, in some embodiments, a one-way valve is provided in the inner flow channel of the intermediate conduit section, and the one-way valve is closer to the suction inlet than the filter.

[0051] In a second aspect of the present disclosure, an intravascular thrombus aspiration catheter is provided, the intravascular thrombus aspiration catheter comprising: an inner flow channel, a distal aspiration catheter segment, an intermediate catheter segment, and a proximal drive catheter segment, wherein the inner flow channel sequentially connects the distal aspiration catheter segment, the intermediate catheter segment, and the proximal drive catheter segment from the distal end to the proximal end of the intravascular thrombus aspiration catheter, wherein the intravascular thrombus aspiration catheter further comprises a suction inlet and an outflow window, the inner flow channel connecting the suction inlet and the outflow window; in the intermediate catheter segment, The above-mentioned internal flow channel of the segment is provided with a filter; the above-mentioned internal flow channel of the above-mentioned proximal driving catheter segment is provided with an impeller; the above-mentioned suction inlet, the above-mentioned filter and the above-mentioned outflow window are sequentially provided from the distal end to the proximal end of the above-mentioned intravascular thrombus aspiration catheter; the above-mentioned impeller is provided at the above-mentioned outflow window, or the above-mentioned outflow window is provided at the proximal end of the above-mentioned intravascular thrombus aspiration catheter than the above-mentioned impeller; the above-mentioned distal suction catheter segment is detachably connected to the above-mentioned intermediate catheter segment, and the above-mentioned suction inlet is provided on the above-mentioned distal suction catheter segment.

[0052] Furthermore, in some embodiments, the one-way valve is a biological valve or a mechanical valve.

[0053] Furthermore, in some embodiments, the filter is made of metal material or polymer material, and the filter is constructed into a dense mesh structure or a claw-shaped structure.

[0054] An embodiment of the present application provides a suction catheter, comprising a suction tube and a filter element. The suction tube comprises a tube body, within which a suction channel, a suction inlet, and a suction outlet are formed. The suction inlet and the suction outlet are respectively connected to the suction channel. The filter element is disposed in the suction channel and located between the suction inlet and the suction outlet. In an interventional state, the suction inlet is located at a preset suction position, the suction outlet is located at a preset drainage position, and the tube body extends from the preset suction position through an intermediate transition zone to the preset drainage position.

[0055] According to the implementation scheme of the first aspect of the present 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 in sequence, the first suction section, the second suction section and the third suction section jointly define a suction channel, and 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.

[0056] According to an embodiment of the first aspect of the present application, the axial lengths of the first suction segment, the second suction segment, and the third suction segment are all greater than or equal to 5 mm and less than or equal to 60 mm.

[0057] According to the implementation of the first aspect of the present application, the suction catheter is used to aspirate thrombus, the preset suction position is the pulmonary artery, the preset drainage position is the intersection of the inferior vena cava and the superior vena cava, and the intermediate transition zone is the right ventricle and right atrium.

[0058] According to the embodiment of the first aspect of the present application, it also includes an outflow channel connected to the proximal end of the suction tube, and an outflow window connected to the suction outlet is provided on the outflow channel. In the intervention state, the outflow window is located at a preset drainage position.

[0059] According to an embodiment of the first aspect of the present application, it also includes a first connecting block and a first sleeve that are detachably connected, one of the first connecting block and the first sleeve is located on the outflow channel, and the other is located at the proximal end of the suction tube; a first connecting groove is provided on the first sleeve, and the first connecting groove extends along the maze path. When the first connecting block is connected to the first sleeve, at least part of the first connecting block is located in the maze path.

[0060] According to the implementation scheme of the first aspect of the present application, along the axial direction of the suction pipe, the tube body includes a distal suction pipe and a proximal suction pipe arranged in sequence, the distal suction pipe and the proximal suction pipe jointly define a suction channel, and the suction inlet and the suction outlet are respectively located in the distal suction pipe and the proximal suction pipe; the suction pipe also includes a second sleeve and a third sleeve that are detachably connected, one of the second sleeve and the third sleeve is connected to the proximal end of the distal suction pipe, and the other is connected to the distal end of the proximal suction pipe; the second sleeve is provided with a second connecting block, and the third sleeve is provided with a second connecting groove passing through 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 suction pipe passes through the intermediate transition zone from the preset suction position and is connected to the proximal suction pipe through the second sleeve and the third sleeve, and the proximal suction pipe extends from the intermediate transition zone to the preset drainage position.

[0061] According to an embodiment of the first aspect of the present application, the second sleeve is connected to the distal end of the proximal suction tube, and the third sleeve is connected to the proximal end of the distal suction tube;

[0062] The second connecting block is arranged on the outer circumferential surface of the second sleeve, and the second connecting block includes a first circumferential surface, a first inclined surface and a second inclined surface. The first circumferential surface is spaced apart from the outer circumferential surface of the second sleeve, and the first inclined surface connects the distal end of the first circumferential surface and the outer circumferential surface of the second sleeve; the second inclined surface connects the first circumferential surface and the outer circumferential surface of the second sleeve, and the second inclined surface is located on at least one side of the first circumferential surface in the circumferential direction.

[0063] According to the embodiment of the first aspect of the present application, it further includes a one-way valve, which is arranged in the suction channel and located at the distal end of the filter element.

[0064] An embodiment of the second aspect of the present application provides an interventional device, comprising: a delivery sheath and a suction catheter, a first passage being provided inside the delivery sheath; the suction catheter comprising a suction tube and a filter element, the suction tube comprising a tube body, a suction channel, a suction inlet and a suction outlet being formed inside the tube body, the suction inlet and the suction outlet being respectively connected to the suction channel; the filter element being provided in the suction channel and being located between the suction inlet and the suction outlet; the interventional device comprises an interventional state, in which at least part of the suction catheter is located in the first passage, and the suction outlet extends from the proximal end of the delivery sheath into the first passage and extends from the distal end of the delivery sheath out of the first passage, the suction inlet is located at a preset suction position, the suction outlet is located at a preset drainage position, and the tube body extends from the preset suction position through the intermediate transition zone to the preset drainage position.

[0065] An embodiment of the third aspect of the present application provides a thrombectomy training method, which is based on the aspiration catheter of any of the first aspect embodiments above, and the thrombectomy training method is used to clear a thrombus in the pulmonary artery; the training method is applied to a human model, which is internally provided with a simulated heart and simulated blood vessels, the simulated blood vessels including the femoral vein, superior vena cava, inferior vena cava and pulmonary artery, and a closed circulation 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 a hydrogel is filled into the pulmonary artery to simulate a thrombus; the thrombectomy training method comprises the following steps: through femoral vein puncture, a guide wire and a delivery sheath are sequentially passed through the femoral vein, the inferior vena cava, the right atrium of the simulated heart, and the right ventricle of the simulated heart, and then pushed to a preset aspiration position, which is the pulmonary artery; the guide wire and sheath core are withdrawn, leaving the delivery sheath at the preset aspiration position; the aspiration catheter is pushed along the delivery sheath to the preset aspiration position; the delivery sheath is withdrawn to the preset drainage position so that the delivery sheath exposes the aspiration outlet of the aspiration tube, and the preset drainage position is located at the intersection of the inferior vena cava and the superior vena cava.

[0066] According to the implementation scheme of the first aspect of the present application, it also includes: pushing the delivery sheath to the preset suction position again; withdrawing the suction catheter and cleaning the thrombus in the suction catheter; pushing the suction catheter along the delivery sheath to the preset suction position again; and withdrawing the delivery sheath to the preset drainage position again, so that the delivery sheath exposes the suction outlet of the suction tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0068] FIG1 is a schematic structural diagram of a suction catheter provided in some embodiments of the present application;

[0069] FIG2 is a cross-sectional view of the suction catheter of FIG1 ;

[0070] FIG3 is a schematic structural diagram of the outflow pipe in FIG2 ;

[0071] FIG4 is a schematic diagram of the first sleeve structure of the suction catheter according to an embodiment of the present application;

[0072] FIG5 is a front view of the first sleeve in FIG4 ;

[0073] FIG6 is a schematic structural diagram of the connection assembly in FIG2 ;

[0074] FIG7 is a schematic structural diagram of a connection portion of a suction catheter according to some embodiments of the present application;

[0075] FIG8 is a schematic diagram of another suction catheter according to some embodiments of the present application;

[0076] FIG9 is a schematic diagram of the split body of FIG8;

[0077] FIG10 is a partial cross-sectional view of the first connecting section in FIG9 ;

[0078] FIG11 is a schematic diagram of a one-way valve structure of a suction catheter in some embodiments of the present application;

[0079] FIG12 is a cross-sectional view of a suction catheter according to some embodiments of the present application;

[0080] FIG13 is an enlarged view of the tightening member in FIG12;

[0081] FIG14 is a cross-sectional view of another aspiration catheter provided in some embodiments of the present application;

[0082] FIG15 is an enlarged view of the tightening member in FIG14;

[0083] FIG16 is a schematic cross-sectional view of a suction tube of a suction catheter according to some embodiments of the present application;

[0084] FIG17 is a schematic diagram of an end structure of a suction tube in a suction catheter in some embodiments of the present application;

[0085] FIG18 is a schematic diagram of another end surface structure of a suction tube in a suction catheter in some embodiments of the present application;

[0086] FIG19 is a schematic diagram of the suction catheter in FIG2 in an interventional state;

[0087] FIG20 is a schematic diagram of an interventional state of an aspiration catheter aspirating a thrombus in a pulmonary artery according to some embodiments of the present application;

[0088] FIG. 21 is a flow chart of a thrombus removal training method according to some embodiments of the present application. DETAILED DESCRIPTION

[0089] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0090] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0091] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0092] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0093] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0094] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0095] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", and "thickness" are used interchangeably.

[0096] The directions or positional relationships indicated by “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the embodiments of the present application.

[0097] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0098] In addition, it should be noted that, in the description of the embodiments of this application, unless otherwise explicitly defined, "in vivo" means inside the patient's tissues and organs, and "in vitro" means outside the patient's tissues and organs. Furthermore, in the embodiments of this application, "distal" means the direction away from the physician, and "proximal" means the direction toward the physician.

[0099] Generally, thrombi, especially fresh ones, are like jelly in the body, lacking mechanical strength and easily rupturing. Balloon thrombectomy requires distal blood flow occlusion. To achieve complete thrombectomy, the thrombectomy balloon must adhere to the vessel wall, making it prone to scraping during movement. Stent thrombectomy can easily lead to thrombus rupture and incomplete thrombectomy. Catheter-based negative pressure thrombus aspiration has traditionally involved manual aspiration and the Bernoulli effect, which aspirates the thrombus out of the body. Manual aspiration is unstable, has low suction force, and is clinically ineffective. Aspiration using the Bernoulli effect involves driving a pump to generate pulsed pressure, injecting saline through the catheter and then back-jetting it from the side ports of the catheter tip to flush out the thrombus. The high-speed saline simultaneously creates a localized low-pressure zone, allowing fragmented thrombus particles to be aspirated out of the catheter's discharge port. A drawback of this method is that while the thrombus is aspirated out of the body, blood is also aspirated, resulting in a decrease in the patient's blood volume. In such cases, physicians must exercise caution to ensure that the thrombus is removed without excessively impacting the patient's blood supply. Additional measures may be needed to replace blood or other body fluids to maintain the patient's circulation and vital signs.

[0100] Therefore, an interventional thrombectomy device has been proposed. However, filtering the blood within the patient's body (filtering out the thrombus) and returning the blood directly to the blood vessels can avoid the problems caused by extracorporeal circulation. However, this also causes additional problems. For example, different types of interventional heads need to be customized for different vascular branches. The one-piece design will inevitably lead to higher costs for patients and waste of medical resources. In addition, because it is an interventional filtering thrombectomy, when there are too many thrombi, the device will inevitably face the problem of replacing the filter to clear the accumulated thrombi. The one-piece design also faces higher costs and waste of medical resources.

[0101] In order to solve at least one of the above problems and one or more of other potential problems, an embodiment of the present disclosure proposes a suction catheter, which has multiple sections and at least two adjacent sections are detachably connected to reduce replacement costs and improve operational efficiency.

[0102] FIG1 is a schematic structural diagram of a suction catheter provided in some embodiments of the present application; FIG2 is a longitudinal cross-sectional view of the suction catheter of FIG1 .

[0103] As shown in Figures 1 and 2, some embodiments of the present application provide a suction catheter, which includes a suction tube 100, a filter element 200, and an outflow tube 330. The suction catheter is formed with an inner flow channel extending along the axial direction X and connecting the suction tube 100 and the outflow tube 330. The suction tube 100 is formed with a suction inlet 101, and the outflow tube 330 is formed with an outflow window 310. The inner flow channel connects the suction inlet 101 and the outflow window 310. The filter element 200 is disposed in the inner flow channel 330 and is located between the suction inlet 101 and the outflow window 310. In summary, the working process of the suction catheter is as follows: blood with a thrombus 504 enters the inner flow channel from the suction inlet 101, the thrombus 504 is intercepted by the filter element 200, and the blood passes through the filter element 200 and flows out of the outflow window 310.

[0104] In some application scenarios, as shown in Figures 1 and 2, some embodiments of the present application provide a suction catheter, which is formed with an internal flow channel extending along the axial direction X. The suction catheter includes: a suction tube 100, a filter element 200 and an outflow pipe 330, and the suction tube includes a first connecting section 110 and a second connecting section 120 arranged along the axial direction; the internal flow channel connects the first connecting section 110, the second connecting section 120 and the outflow pipe 330 along the axial direction; the filter element 200 is arranged in the internal flow channel; the suction tube is formed with a suction inlet 101, and the outflow pipe 330 is formed with an outflow window 310, the internal flow channel connects the suction inlet 101 and the outflow window 310, and at least one of the connection points of the first connecting section 110, the second connecting section 120 and the outflow pipe 330 includes a detachable connection.

[0105] It will be understood that the filter element 200 is used to filter substances, such as blood clots, from the liquid entering the inner flow channel through the suction inlet 101. In some implementations, the filter element 200 is located between the suction inlet 101 and the outflow window 310. In other alternative implementations, the filter element 200 is located at the suction inlet 101. In other alternative implementations, the filter element 200 is located at the outflow window 310. The following description will take the filter element 200 located between the suction inlet 101 and the outflow window 310 as an example.

[0106] In some embodiments, the suction inlet 101 is provided in the first connecting section 110 .

[0107] For example, the suction inlet 101 is located at the end of the first connecting section 110 facing away from the second connecting section 120. The end of the second connecting section 120 facing away from the first connecting section 110 is formed with a suction outlet, which is connected to the outflow pipe 330. For example, the internal flow channel includes an outflow channel 301 and a suction channel 103, which are connected. The suction channel 103 passes through the suction pipe 100, and the outflow channel 301 passes through the outflow pipe 330. The suction outlet 102 is connected to the outflow channel 301 in the outflow pipe 330.

[0108] The suction duct can be constructed to be detachable into one or more sections. For example, the first connecting section 110 and the second connecting section 120 are detachably connected, and the second connecting section 120 and the outflow pipe 330 are fixedly connected. Alternatively, the suction duct 100 is detachably connected to the outflow pipe 330 as a whole, that is, the first connecting section 110 and the second connecting section 120 are an integral structure or fixedly connected, and the second connecting section 120 and the outflow pipe 330 are detachably connected. Alternatively, the first connecting section 110 and the second connecting section 120 are detachably connected, and the second connecting section 120 and the outflow pipe 330 are detachably connected. For example, the outflow pipe 330 can form a negative pressure on the suction duct by external power suction or an impeller mechanism 320. The following description will take the drive assembly 300 using the impeller mechanism 320 as an example.

[0109] Illustratively, the filter element 200 can be disposed within the suction tube 100 or within the outflow tube 330. In one example, the filter element 200 is disposed within the suction channel 103 and between the suction inlet 101 and the suction outlet 102. For example, the filter element 200 is disposed within the internal flow channel corresponding to the first connecting section 110, or the filter element 200 is disposed within the internal flow channel corresponding to the second connecting section 120. Alternatively, the filter element 200 is disposed between the first connecting section 110 and the second connecting section 120.

[0110] When the suction inlet 101 of the suction catheter reaches the thrombus 504, negative pressure draws the thrombus 504 from the suction inlet 101 into the inner flow channel. The thrombus 504 is collected by the filter element 200, and blood passes through the filter element 200 and flows out from the outflow window 310. While collecting the thrombus 504, blood loss is reduced, thereby reducing the impact of the suction catheter on the patient. The blood is discharged into the body through the outflow window 310 through the suction outlet 102. The convenience of use of the suction catheter is achieved by making at least one of the connections between the first connecting section 110, the second connecting section 120 and the outflow tube 330 detachable. When the first connecting section 110 needs to be replaced to adapt to different blood vessel sizes, the first connecting section 110 and the second connecting section 120 can be detachably connected. When the drive assembly 300 needs to be easily inspected, the second connecting section 120 and the drive assembly 300 can be detachably connected.

[0111] In other words, the inner flow channel connects the distal suction catheter segment (i.e., first connecting segment 110), the intermediate catheter segment (i.e., second connecting segment 120), and the proximal actuation catheter segment (i.e., outflow tube 330) in sequence from the distal end of the suction catheter to the proximal end. The suction inlet 101, the filter element 200, and the outflow window 310 are sequentially provided from the distal end to the proximal end of the suction catheter.

[0112] In the present application, the arrangement of the filter element 200 in the inner flow channel is varied. In one example, the inner flow channel of the middle conduit section is provided with the filter element 200. In some implementations, the filter element 200 is a filter screen.

[0113] It can be understood that the filter is arranged in the internal flow channel corresponding to the intermediate duct segment, which means that the connection position of the filter on the wall surface of the internal flow channel is located on the internal flow channel corresponding to the intermediate duct segment, and the filter can be extended only to the intermediate pipe segment in the axial direction, or it can extend from the intermediate pipe segment to the proximal driving duct segment.

[0114] In some embodiments, one or more sections of the inner flow channel of the intermediate conduit section are configured as a detachable structure.

[0115] Furthermore, in some embodiments of the present application, the driving assembly 300 is detachably connected to the second connecting section 120 .

[0116] For example, the driving assembly 300 can be connected to the second connecting section 120 in one or more detachable connection modes such as snap connection, bolt connection, thread connection, plug connection, etc.

[0117] The detachable connection between the outflow tube 330 and the aspiration tube 100 facilitates maintenance of the drive assembly 300 or replacement and cleaning of the filter 200. The intermediate catheter section is detachably connected to the proximal drive catheter section, facilitating intraoperative replacement of the filter 200 without completely dismantling the thrombus 504 aspiration system, reducing the time required to replace the entire aspiration system and allowing for the reuse of some components, thereby reducing costs.

[0118] In other words, the distal suction catheter section is detachably connected to the intermediate catheter section, and the suction inlet 101 is provided on the distal suction catheter section.

[0119] In one embodiment of the present application, the filter element is disposed in the inner flow channel corresponding to the second connecting section suction pipe.

[0120] Continuing to refer to Figures 1 and 2, in a specific embodiment of the present application, the drive assembly 300 includes an impeller mechanism 320, an outflow window 310 is opened in the circumferential direction Z of the outflow pipe, and along the axial direction X, at least a portion of the impeller mechanism 320 is arranged opposite to the outflow window 310.

[0121] Exemplarily, the outflow pipe 330 and the suction pipe 100 are connected by one or more of a variety of detachable connection methods such as clamping, bolting, threading, plugging, etc.

[0122] In one example, the impeller assembly includes an impeller and a rotating shaft, wherein the impeller is connected to the rotating shaft, and the rotation of the rotating shaft drives the impeller to rotate.

[0123] That is, an impeller is provided in the inner flow channel of the proximal drive conduit section. Exemplarily, the impeller is provided at the outflow window 310, or the outflow window 310 is provided closer to the proximal end of the suction conduit than the impeller, or the outflow window 310 is provided farther from the proximal end of the suction conduit than the impeller.

[0124] The impeller that pumps blood can also be positioned within the inner flow channel of the proximal drive conduit section of the aspiration catheter. Typically, the outflow window 310 is positioned just at the tail of the impeller, that is, close to the impeller that pumps blood. This allows the impeller to more effectively pump blood within the inner flow channel of the aspiration catheter and discharge the blood through the outflow window 310.

[0125] In some embodiments, the outflow window 310 is positioned closer to the proximal end of the suction catheter than the impeller. It should be noted that positioning the outflow window 310 at the impeller, or positioning the outflow window 310 closer to the proximal end of the suction catheter than the impeller, allows the impeller to more effectively perform its suction function at the same power. Conversely, positioning the outflow window 310 closer to the distal end of the suction catheter than the impeller prevents blood from being discharged from the outflow window 310 to the impeller, resulting in a blood stagnation zone and the subsequent formation of a thrombus 504.

[0126] In other words, by making the suction catheter include the outflow channel 301, the suction tube 100 and the filter element 200, when the thrombus 504 and blood are sucked into the suction channel 103 from the distal end of the suction tube 100, the filter element 200 intercepts the thrombus 504 in the suction channel 103, and the blood passes through the filter element 200 and flows back to the patient's blood vessel from the outflow window 310 on the outflow channel 301, thereby reducing the patient's blood loss during the suction process of the thrombus 504.

[0127] In one embodiment, the drive assembly 300 further includes a drive tube 340, and the impeller is located within the outflow channel 301. The drive tube 340 is connected to the proximal end of the outflow channel 301 and contains a rotating shaft for driving the impeller. When the impeller rotates, it drives blood and thrombus 504 from the distal end of the suction tube 100 into the suction channel 103. The filter element 200 intercepts the thrombus 504 within the suction channel 103, while the blood passes through the filter element 200 and flows back into the patient's blood vessels through the outflow window 310 in the outflow channel 301.

[0128] In other words, the proximal drive catheter segment in the suction catheter also includes a flexible drive shaft, i.e., a rotating shaft and a sheath. The flexible drive shaft is arranged inside the proximal drive catheter segment, and the sheath is arranged on the outside of the flexible drive shaft. The proximal drive catheter segment is connected to the extracorporeal motor through the flexible drive shaft and the sheath. The extracorporeal motor can drive the impeller to rotate (high-speed rotation), so that the blood and thrombus 504 in the internal flow channel of the suction catheter enter the internal flow channel from the suction inlet 101 and flow toward the outflow window 310, and finally flow out from the outflow window 310.

[0129] FIG3 is a schematic structural diagram of the outflow tube 330 in FIG2 ; FIG4 is a schematic structural diagram of the first sleeve of the suction catheter according to an embodiment of the present application; and FIG5 is a front view of the first sleeve in FIG4 .

[0130] As shown in Figures 1 to 5, in one embodiment of the present application, the suction tube also includes a first sleeve, which is provided with a first connecting groove; the suction tube also includes a first connecting block, one of the first connecting block and the first sleeve is connected to the outflow pipe, and the other is connected to the second connecting section. When the second connecting section is connected to the outflow pipe, the first connecting block 331 is accommodated in the first connecting groove 131, which is used to limit the movement of the outflow pipe 330 relative to the suction tube 100.

[0131] For example, the first connection block 331 may have a structure such as a prism or a prism. The material of the first connection block 331 may be the same as or different from the material of the outflow tube 330. The first connection block 331 may be connected to the outflow tube 330 by bonding, welding, fastening, or integral molding.

[0132] In some examples, the first connecting groove 131 may penetrate the wall thickness of the first sleeve 130 or be recessed into the outer wall of the first sleeve 130 to a certain depth.

[0133] The first connection block 331 accommodated in the first connection groove 131 can limit the outflow pipe 330 from rotating in the circumferential direction Z or moving in the axial direction X relative to the suction pipe 100 .

[0134] In other words, in some embodiments, the suction catheter further includes a detachably connected first connecting block 331 and a first sleeve 130, one of which is located on the outflow channel 301, and the other is located at the proximal end of the suction tube 100. The first sleeve 130 is provided with a first connecting groove 131, which extends along a labyrinthine path. When the first connecting block 331 is connected to the first sleeve 130, at least a portion of the first connecting block 331 is located within the labyrinthine path.

[0135] For example, the labyrinthine path can be L-shaped, S-shaped, U-shaped, W-shaped, or any other path. The purpose is to prevent the first connecting block 331 from being easily disengaged from the first connecting groove 131 when the first connecting block 331 is connected to the first sleeve 130, thereby preventing the outflow channel 301, i.e., the outflow tube 330, from accidentally separating from the suction tube 100. When the outflow channel 301 and the suction tube 100 need to be separated, the first connecting block 331 can be guided out of the first connecting groove 131 along the labyrinthine path.

[0136] For example, it should be noted that the cross-sectional shapes of the suction tube 100 and the first sleeve 130 are both axisymmetric shapes, and the suction tube 100 and the first sleeve 130 have a central axis, and the extension direction of the central axis is the axial direction X. The cross-sectional shapes of the suction tube 100 and the first sleeve 130 can be circular or other axisymmetric shapes.

[0137] The first sleeve 130 is cylindrical and thus has two circumferential Z-surfaces: the outer circumferential Z-surface of the outer wall, and the inner circumferential Z-surface of the inner wall 630. The axial X direction of the suction tube 100 and the first sleeve 130 refers to the direction of the central axis. The circumferential Z-direction refers to the circumferential direction of the outer periphery of the cylinder. The radial direction refers to the direction passing through the central axis L in a radial plane, and is also generally referred to as a linear direction along a diameter or radius, or a linear direction perpendicular to the central axis L.

[0138] The radial dimension generally refers to the radius or diameter of an axisymmetric part, while the circumferential Z dimension generally refers to the circumference of an axisymmetric part. Since the suction channel 103 is enclosed by the suction tube 100, the radial dimension of the suction channel 103 is equal to the radial dimension of the inner circumference of the suction tube 100. It should be understood that in this application, the axial X, circumferential Z, radial, and circumferential Z dimensions of other components can refer to the aforementioned description of the suction tube 100 and first sleeve 130.

[0139] Furthermore, in one embodiment of the present application, the first connecting groove 131 penetrates the wall thickness of the first sleeve 130, and the first connecting groove 131 includes a first section L1 and a second section L2. The first section L1 extends along the axial direction X, and the second section L2 extends along the circumferential direction Z of the first sleeve 130. The end of the first section L1 facing away from the outflow window is connected to one end of the second section L2; the axial X dimension of the middle part of the second section L2 is smaller than the axial X dimension on both sides of the middle part, and the first connecting block 331 is placed on the side of the middle part of the second section L2 facing away from the first section L1.

[0140] In some embodiments, the labyrinthine path is an L-shaped path, and the first connecting groove 131 includes a first section L1 extending from the proximal end to the distal end of the first sleeve 130 and a second section L2 extending along the circumferential direction Z of the first sleeve 130. One end of the second section L2 is connected to the distal end of the first section L1. When the first connecting block 331 is connected to the first sleeve 130, at least a portion of the first connecting block 331 is located within the second section L2.

[0141] In some embodiments, a first connecting block 331 protrudes from the outer circumference of the outflow channel 301, i.e., the outer wall of the outflow tube 330. The first sleeve 130 is connected to the proximal end of the suction tube 100 by welding, gluing, or threading. The first section L1 and the second section L2 are arranged in an L-shape. When the first connecting block 331 is connected to the first sleeve 130, it extends from the first section L1 along the axial direction X into the first connecting groove 131.

[0142] When the first connecting block 331 is located at the junction of the first section L1 and the second section L2, the first connecting block 331 and the first sleeve 130 are rotated along the circumferential direction Z, causing the first connecting block 331 to move from the first section L1 to the second section L2. At this point, the contoured surface of the first sleeve 130 facing the second section L2 restricts the axial movement of the first connecting block 331, thereby achieving the connection between the first sleeve 130 and the first connecting block 331. To separate the first connecting block 331 from the first sleeve 130, the connection process can be reversed.

[0143] In some embodiments, the second section L2 includes a first sub-section L3 and a second sub-section L4, with the first sub-section L3 connecting the second sub-section L4 and the first section L1. The first sleeve 130 is further provided with a boss that protrudes toward the first sub-section L3. In other words, the profile of the second section L2 of the first sleeve 130 is recessed inward of the second section L2, forming the boss located in the first sub-section L3. This allows the width of the first sub-section L3 to be smaller than the width of the second sub-section L4. For example, a portion of the first sub-section L3 is smaller than the width of the second sub-section L4, or the entire width of the first sub-section L3 is smaller than the width of the second sub-section L4.

[0144] By providing the boss, when the first connecting block 331 enters the second subsection L4, the boss can prevent the first connecting block 331 from returning from the second section L2 to the first section L1, thereby reducing the probability of accidental separation of the first connecting block 331 and the first sleeve 130.

[0145] In other embodiments, the first connecting groove 131 may be directly located on the suction pipe 100 .

[0146] In other embodiments, the first connecting groove 131 may be located on the outflow channel 301 , and the first connecting block 331 may be located on the suction pipe 100 .

[0147] In the present application, the suction pipe 100 and the outflow channel 301 are connected via the first connecting block 331 and the first sleeve 130 , so that the suction pipe 100 and the outflow channel 301 can be detachably connected, thereby facilitating flushing and replacement of the filter element 200 and improving the service life of the suction pipe 100 .

[0148] Continuing to refer to FIG. 1 and FIG. 2 , in some optional embodiments of the present application, the first connecting section 110 and the second connecting section 120 are detachably connected.

[0149] For example, the first connecting section 110 and the second connecting section 120 can be connected by one or more of a variety of detachable connection methods such as snap connection, bolt connection, threaded connection, plug-in connection, etc.

[0150] In other words, the suction tube 100 includes a distal suction tube, i.e., a first connecting section 110, and a proximal suction tube, i.e., a second connecting section 120, which are sequentially arranged. The distal suction tube and the proximal suction tube together define the suction channel 103. The proximal suction tube connects the distal suction tube and the outflow channel 301. In other words, the proximal suction tube connects the distal suction tube and the outflow tube 330.

[0151] Furthermore, the distal suction catheter segment at the distal end is replaceable. For example, in some embodiments, the distal suction catheter segment, i.e., the first connecting segment 110, is detachably connected to the intermediate catheter segment, i.e., the second connecting segment 120. In this way, by switching the distal suction catheter segment (changing the distal tube diameter and length), the suction of thrombi 504 with different blood vessel diameters of different patients can be adapted.

[0152] FIG6 is a schematic structural diagram of the connecting assembly 140 in FIG2 . As shown in Figures 2 and 6, in an optional embodiment of the present application, the suction pipe 100 also includes a connecting assembly 140, which includes a second sleeve 141 and a third sleeve 142 arranged along the axial direction X. The second sleeve 141 is connected to the first connecting section 110, and the third sleeve 142 is connected to the second connecting section 120; the second sleeve 141 includes a clamping section 141a and a first sealing section 141b connected along the axial direction X, the first sealing section 141b is arranged on the side of the clamping section 141a facing away from the suction inlet 101, and the clamping section 141a is provided with a plurality of second connecting blocks 143 along the circumferential direction Z of the second sleeve 141; the third sleeve 142 includes a plurality of second connecting grooves 144 arranged along its own circumferential direction Z, the second connecting blocks 143 are placed in the second connecting grooves 144, a portion of the filter element 200 is placed in the third sleeve, and a portion of the filter element 200 abuts against the third sleeve 142 through the first sealing section 141b.

[0153] A plurality of second connection blocks 143 are arranged at intervals around the outer circumference of the second sleeve 141 , and a plurality of second connection grooves 144 corresponding to the second connection blocks 143 are provided on the third sleeve 142 .

[0154] In other words, the suction tube 100 further includes a detachably connected second sleeve 141 and a third sleeve 142. One of the second sleeve 141 and the third sleeve 142 is connected to the distal suction tube, i.e., the proximal end of the first connecting section 110, and the other is connected to the proximal suction tube, i.e., the distal end of the second connecting section 120. The second sleeve 141 is provided with a second connecting block 143, and the third sleeve 142 is provided with a second connecting groove 144 extending through the third sleeve 142. When the second sleeve 141 and the third sleeve 142 are connected, at least a portion of the second connecting block 143 is located within the second connecting groove 144.

[0155] Exemplarily, when the second sleeve 141 and the third sleeve 142 are connected, the second sleeve 141 can be sleeved outside the third sleeve 142, and the third sleeve 142 can also be sleeved outside the second sleeve 141. The second sleeve 141, the third sleeve 142 and the distal suction pipe and the proximal suction pipe can be connected by welding, gluing or threading.

[0156] In one example, the second sleeve 141 is connected to the distal end of the proximal suction pipe, and the third sleeve 142 is connected to the proximal end of the distal suction pipe. The second connecting block 143 is provided on the outer circumference of the second sleeve 141 .

[0157] In one embodiment of the present application, the second connecting block 143 includes a first circumferential surface 143a and a first inclined surface 143b. The first circumferential surface 143a is radially spaced apart from the outer circumferential surface of the second sleeve 141. The first inclined surface 143b connects the distal end of the first circumferential surface 143a and the outer circumferential surface of the second sleeve 141. The first inclined surface 143b serves to transitionally connect the first circumferential surface 143a and the second sleeve 141. This guides the second connecting block 143 as it enters the second connecting groove 144, facilitating insertion.

[0158] When the second sleeve 141 and the third sleeve 142 approach each other, the first inclined surface 143b abuts against the third sleeve 142 and expands the third sleeve 142, so that the radial dimension of the inner circumference of the third sleeve 142 becomes larger until the second connecting block 143 extends into the second connecting groove 144, the first inclined surface 143b separates from the third sleeve 142, and the third sleeve 142 rebounds.

[0159] Furthermore, in some embodiments, the second connecting block 143 further includes a blocking surface 143c, which connects the proximal end of the first circumferential surface 143a and the outer circumferential surface of the second sleeve 141. The blocking surface 143c is perpendicular to the outer circumferential surface of the second sleeve 141. When the second sleeve 141 and the third sleeve 142 move along the axial direction X, the blocking surface 143c abuts against the contour surface of the second connecting groove 144, thereby preventing the second sleeve 141 and the third sleeve 142 from separating or moving along the axial direction X.

[0160] In addition, in some embodiments, the second connecting block 143 further includes a second inclined surface 143d, which connects the first circumferential surface 143a and the outer circumferential surface of the second sleeve 141. The second inclined surface 143d is located on at least one side of the first circumferential surface 143a in the circumferential direction Z. After the second sleeve 141 is connected to the third sleeve 142, the second sleeve 141 and the third sleeve 142 are relatively rotated along the circumferential direction Z so that the second inclined surface 143d abuts against the contour surface of the second connecting groove 144, thereby expanding the third sleeve 142 and increasing the radial dimension of the inner circumferential surface of the third sleeve 142 until the second connecting block 143 leaves the second connecting groove 144. After that, the second sleeve 141 and the third sleeve 142 can be separated along the axial direction X.

[0161] In other embodiments, the second sleeve 141 is connected to the proximal end of the distal suction pipe, and the third sleeve 142 is connected to the distal end of the proximal suction pipe. In this embodiment, the positions of the blocking surface 143c and the first inclined surface 143b are interchanged, which will not be repeated here.

[0162] In other embodiments, the distal suction tube and the proximal suction tube are connected by threads.

[0163] For example, the first sealing section 141b may include a convex portion or a convex portion and a concave portion. The open end of the filter element 200 is connected to the convex portion, which then abuts against the inner circumference of the third sleeve 142, thereby achieving a seal at the connection assembly 140 and ensuring the establishment of negative pressure in the suction channel 103.

[0164] In one example, the first sealing section 141 b includes a convex portion and a concave portion along the axial direction X, wherein the concave portion is disposed between the convex portion and the engaging section 141 a. The open end of the filter element 200 is disposed in the concave portion and extends beyond the convex portion into the second connecting section 120 .

[0165] FIG7 is a schematic structural diagram of the connection portion 210 of the suction catheter according to some embodiments of the present application.

[0166] As shown in Figures 1 to 7, in one embodiment of the present application, the filter element 200 includes a connecting portion 210 and a filter screen disposed on the connecting portion 210, and the connecting portion 210 is connected to the suction pipe 100. The connecting portion 210 and the filter screen are connected as an integral structure, or the connecting portion 210 and the filter screen are detachably connected.

[0167] In another example, the connecting portion 210 is an open ring with an annular cavity 220. Since the open end of the filter screen is prone to unraveling due to cutting, the open end is placed within the annular cavity 220, for example, by gluing. Placing the connecting portion 210 within the recess improves the stability of the open end of the filter screen, reduces the risk of deformation, and reduces the filtering effect on the thrombus 504.

[0168] In some embodiments, the filter screen includes a mesh and a plurality of mesh openings formed by the mesh. The connecting portion 210 is an annular clamp. The mesh is woven from a plurality of mesh wires arranged horizontally and vertically. The mesh wires are welded or bonded to the connecting portion 210, which is then welded or bonded to the suction tube 100. The connecting portion 210 is used to secure the mesh wires, preventing them from falling off, causing the mesh openings to widen and potentially omitting the thrombus 504.

[0169] In some embodiments, the mesh includes a central portion and a peripheral portion surrounding the central portion, with the mesh openings in the peripheral portion having a smaller aperture than the mesh openings in the central portion. Alternatively, the mesh openings gradually decrease in diameter toward the connecting portion 210. By making the mesh openings on the peripheral side denser than the mesh openings in the center, the interaction between the mesh lines on the peripheral side is increased, which can also prevent mesh lines from falling off.

[0170] In some embodiments, the material of the connecting portion 210 includes metal. The material of the filter includes polyethylene terephthalate or polypropylene.

[0171] By designing the suction tube 100 as a split unit, the suction tube 100 can be disassembled for cleaning or replacement of the filter 200 after the suction tube is withdrawn from the body, thereby improving the cleaning efficiency of the suction tube 100. By providing the second sleeve 141 and the third sleeve 142 between the distal suction tube and the proximal suction tube, the distal suction tube and the proximal suction tube can be detachably connected, thereby facilitating flushing and replacement of the filter 200, further improving the service life of the suction tube 100.

[0172] In some other embodiments of the present application, the filter element 200 is connected to at least one of the distal suction tube, the proximal suction tube, the second sleeve 141 and the third sleeve 142 .

[0173] Furthermore, in some embodiments of the present application, the connecting assembly 140 is disposed at an end of the suction tube 100 facing away from the driving assembly 300 .

[0174] Exemplarily, the connecting assembly 140 is connected to the first connecting segment 110 and the second connecting segment 120 , wherein the length of the first connecting segment 110 may be much smaller than the length of the second connecting segment 120 .

[0175] In some examples, the end of the suction tube 100 facing away from the drive assembly 300 includes a certain length range extending from the suction inlet 101 toward the drive assembly 300. For example, the length of the end is D, the length of the suction tube 100 is L, and D / L is less than or equal to the range of 1 / 10 to 1 / 20.

[0176] That is, the connecting assembly 140 is positioned at the end of the first connecting section 110 facing away from the second connecting section 120. Because the connecting assembly 140 reduces the inner diameter of the aspiration tube 100, placing the connecting assembly 140 at the end of the aspiration tube 100 facing away from the drive assembly 300 allows the thrombus 504 to be reshaped only once when drawn into the aspiration tube 100. This avoids a large thrombus 504 undergoing a single reshaping upon entering the first connecting section 110 and a secondary reshaping upon crossing the connecting assembly 140 and entering the filter element 200. This embodiment of the present application achieves a single reshaping of a large thrombus 504, reducing resistance and the risk of occlusion, thereby improving the smoothness of aspiration of the thrombus 504.

[0177] FIG8 is a schematic diagram of another suction catheter according to some embodiments of the present application; FIG9 is a split schematic diagram of FIG8 .

[0178] As shown in Figures 8 and 9, in some optional embodiments of the present application, the first connecting segment 110 and the second connecting segment 120 partially overlap along the axial direction X, and the first connecting segment 110 includes a first body segment 111, a second sealing segment 151 and a first fastening segment 161 arranged in sequence along the axial direction X; the second connecting segment 120 includes a second body segment 121, a second fastening segment 162 and a third sealing segment 152 arranged in sequence along the axial direction X, the third sealing segment 152 is placed in the second sealing segment 151 and is interference connected with the second sealing segment 151, and the second fastening segment 162 is threadedly connected to the first fastening segment 161.

[0179] That is, the detachable connection between the distal aspiration catheter segment, i.e., the first connecting segment 110, and the intermediate catheter segment, i.e., the second connecting segment 120, is a sealed connection with an interference fit. This sealed connection is represented by an interference fit sealing connection portion 150. The detachable connection between the distal aspiration catheter segment and the intermediate catheter segment also includes a threaded connection, represented by a threaded connection portion 160.

[0180] Specifically, the detachable connection between the distal aspiration catheter segment and the intermediate catheter segment is an interference fit, achieving both securement and sealing. Furthermore, additional threads enhance the securement and seal between the two segments. This interchangeable structure (detachable connection) allows physicians to replace distal aspiration catheters of varying lengths, inner diameters, and hardnesses based on clinical needs.

[0181] Furthermore, an example is given of an interference fit sealing connection method and an enhanced fastening method between the distal suction catheter segment and the intermediate catheter segment. The distal suction catheter segment and the intermediate catheter segment of the suction catheter are detachable. The proximal end of the distal suction catheter segment includes a detachable suction segment, which includes a suction segment sealing connection portion, namely a second sealing segment 151, and a suction segment threaded connection portion, namely a first fastening segment 161. The distal end of the intermediate catheter segment includes an intermediate detachable segment, which includes an intermediate segment sealing connection portion, namely a third sealing segment 152, and an intermediate segment threaded connection portion, namely a second fastening segment 162. The suction segment sealing connection portion and the intermediate segment sealing connection portion cooperate to form an interference fit sealing connection portion between the distal suction catheter segment and the intermediate catheter segment. The suction segment threaded connection portion and the intermediate segment threaded connection portion cooperate to form a threaded connection portion 160.

[0182] During the connection process between the first connecting section 110 and the second connecting section 120, the third sealing section 152 is inserted into the second sealing section 151. The outer diameter of the third sealing section 152 is larger than the inner diameter of the second sealing section 151, thereby achieving an interference fit between the third sealing section 152 and the second sealing section 151. When the third sealing section 152 and the second sealing section 151 are inserted into the first fastening section 161 and the second fastening section 162, the first fastening section 161 and the second fastening section 162 are screwed in. During the screwing process, the third sealing end is continuously inserted into the second sealing section 151 until the first fastening section 161 and the second fastening section 162 are screwed into place.

[0183] The threaded connection between first fastening segment 161 and second fastening segment 162 facilitates the insertion and connection of third sealing segment 152 and second sealing segment 151, resulting in a tighter connection and a better sealing effect. Furthermore, the interference fit between third sealing segment 152 and second sealing segment 151 effectively reduces relative rotation of first connecting segment 110 and second connecting segment 120 along circumferential direction Z. This improves the sealing effect of suction channel 103 and provides a good and stable negative pressure environment for aspirating thrombus 504.

[0184] In one example, sealing rings may be provided at the first fastening section 161 and the second fastening section 162 to improve the sealing performance of the end portions.

[0185] In one embodiment, the inner diameter of the second sealing segment 151 gradually expands from the first body segment 111 to the first fastening segment 161, and the outer diameter of the third sealing segment 152 gradually contracts from the second fastening segment 162 to the first body segment 111. The tapered fit between the second sealing segment 151 and the third sealing segment 152 facilitates insertion and removal.

[0186] 8 and 9 , in one embodiment of the present application, the outer diameter of the first body segment 111 has a gradually shrinking trend from the second sealing segment 151 toward the suction inlet 101 .

[0187] That is, the first connecting section 110 of the suction tube 100 has a thin distal end and a thick proximal end, forming a tapered design.

[0188] In some embodiments, the distal suction catheter segment is constructed into a cone-like structure that is thin at the distal end and gradually becomes thick at the proximal end. This facilitates the entry and exit of instruments into blood vessels, reduces frictional resistance, reduces vascular damage, and improves the bending flexibility of the distal end, which is conducive to entering tortuous small blood vessels.

[0189] In other embodiments, the outer diameter of the first body segment 111 of the first connecting segment 110 tends to be thinner at the distal end and thicker at the proximal end, so as to facilitate the suction catheter to enter the blood vessel.

[0190] In some examples, the entire length of the first body segment 111 or a portion of the length from the suction inlet 101 to the second connecting segment 120 has a tapered trend.

[0191] For example, the inner diameter of the first body segment 111 can be variable or non-variable. In one example, the inner diameter of the first body segment 111 is non-variable to reduce the resistance to the entry of the thrombus 504.

[0192] Figure 10 is a partial cross-sectional view of the first connecting segment 110 in Figure 9. As shown in Figures 8 to 10, in other embodiments of the present application, the first connecting segment 110 includes a first body segment 111. The first body segment 111 includes a radially stacked outer layer 111a, an intermediate layer 111b, and an inner layer 111c. The intermediate layer 111b is positioned between the outer layer 111a and the inner layer 111c, and the inner layer 111c encloses and forms the suction channel 103. The outer layer 111a comprises a medical polymer material, the intermediate layer 111b comprises metal, and the friction coefficient of the inner layer 111c is 0.01 to 0.1.

[0193] In other words, the distal suction catheter segment, i.e., the first connecting segment 110, is constructed as a multi-layer composite structure, wherein the multi-layer composite structure includes an outer layer 111a, an intermediate layer 111b, and an inner layer 111c. The outer layer 111a is constructed to be made of a medical polymer material, the inner layer 111c is constructed to be made of a material with a friction coefficient of 0.01 to 0.1, and the intermediate layer 111b is constructed to be made of a metallic reinforced material.

[0194] Regarding the multi-layer composite structure, the inner layer 111c is made of a material with a low friction coefficient to reduce friction with blood and prevent the formation of thrombus 504 on the inner surface of the catheter. For example, it is made of a material with a friction coefficient of 0.01 to 0.1; the middle layer 111b is a metal middle layer 111b, which improves the controllability and support of the distal catheter and prevents the catheter from collapsing due to excessive negative pressure. It can be made of nickel-titanium alloy or stainless steel and processed into a spiral or braided shape; the outer surface of the outer layer 111a has a hydrophilic coating, such as PVP material, which can reduce pushing friction and prevent thrombus 504 from adhering to the tube body.

[0195] Furthermore, in some embodiments, outer layer 111a is made of one or more of PEBAX, TPU, and nylon, inner layer 111c is made of PTFE, and middle layer 111b is made of nickel-titanium alloy or stainless steel. PEBAX stands for polyether block polyamide; TPU stands for thermoplastic polyurethane; and PTFE stands for polytetrafluoroethylene.

[0196] Furthermore, in some embodiments, the surfaces of the outer layer 111a and the inner layer 111c that contact the middle layer 111b are configured with an etching layer. For example, because the inner layer 111c needs to facilitate the entry of the thrombus 504, the material of the inner layer 111c is relatively smooth. To enhance the connection stability between the inner layer 111c and the other layers, the surface of the inner layer 111c facing away from the inner flow channel is etched to form an etching layer, thereby enhancing the connection tightness between the inner layer 111c and the middle layer 111b.

[0197] Furthermore, in some embodiments, the middle layer 111b is configured in a spiral or braided shape, and the middle layer 111b is fixed between the inner layer 111c and the outer layer 111a through a reflow process, wherein the reflow process is a reflow soldering process.

[0198] Furthermore, in some embodiments, the surfaces of the outer layer 111a and the inner layer 111c that contact the intermediate layer 111b are each formed with an etching layer. For example, because the inner layer 111c needs to facilitate the entry of the thrombus 504, the material of the inner layer 111c is relatively smooth. To enhance the connection stability between the inner layer 111c and the other layers, the surface of the inner layer 111c facing away from the inner flow channel is etched to form an etching layer, thereby enhancing the connection tightness between the inner layer 111c and the intermediate layer 111b.

[0199] Furthermore, in some embodiments of the present application, the hardness of the first connecting segment 110 decreases gradually from the second connecting segment 120 to the first connecting segment 110 .

[0200] Furthermore, the hardness of the first body segment 111 decreases from the proximal end to the distal end.

[0201] That is, the hardness of the distal suction catheter segment, i.e., the first connecting segment 110, changes stepwise from the distal end to the proximal end, wherein the distal end of the distal suction catheter segment is softer than the proximal end of the distal suction catheter segment.

[0202] Furthermore, in some embodiments, the distal suction catheter segment is divided into three segments, namely, the distal suction segment 112, the middle suction segment 113 and the proximal suction segment 114, wherein the distal suction segment 112, the middle suction segment 113 and the proximal suction segment 114 are connected in sequence from the distal end of the distal suction catheter segment to the proximal end of the distal suction catheter segment.

[0203] In some embodiments, the hardness of the distal aspiration section 112 is 25D, the hardness of the middle aspiration section 113 is 35D to 55D, and the hardness of the proximal aspiration section 114 is 63D. In some examples, the tolerance of these hardness values ​​is 5D. This ensures that the intravascular thrombus aspiration catheter 504 has excellent pushability, flex resistance, support, and twist control, while also ensuring bending flexibility.

[0204] As shown in FIG. 1 to FIG. 9 , in some embodiments of the present application, a one-way valve 400 may be provided in the suction catheter or no one-way valve may be provided.

[0205] Furthermore, in some optional embodiments of the present application, the one-way valve 400 is disposed on a side of the filter element 200 facing away from the outflow window 310 and is at least partially placed in the inner flow channel.

[0206] In order to prevent the blood from flowing back during the thrombus removal process and causing the thrombus 504 accumulated on the filter element 200 to return to the blood vessel with the blood, thereby endangering the patient's health, a one-way valve 400 is provided in the internal flow channel, and the one-way valve 400 is provided at the distal end of the filter element 200, that is, the one-way valve 400 is closer to the suction inlet 101 than the filter element 200.

[0207] As shown in FIG8 , in some embodiments, a suction inlet 101, a one-way valve 400, a filter element 200, and an outflow window 310 are sequentially arranged from the distal end to the proximal end of the suction catheter. This arrangement sequence allows the thrombus 504 to be effectively gathered at the filter element 200, and the one-way valve 400 is arranged closer to the suction inlet 101, which can effectively intercept the thrombus 504 that may flow back into the blood vessel.

[0208] Among them, the one-way valve 400 can effectively prevent the thrombus 504 from being diverted back into the human body. When the impeller stops rotating or in other special circumstances, the one-way valve 400 can effectively prevent the reverse flow of blood (especially the thrombus 504) inside the internal flow channel of the suction catheter.

[0209] Exemplarily, the one-way valve 400 can be a biological valve or a mechanical valve. The structure of the one-way valve 400 can be a biological valve (two-valve or three-valve), a mechanical valve, or other structure that only allows one-way flow. The valve's opening and closing threshold is between blood pressure and the negative pressure generated by the impeller's rotation. That is, when the impeller rotates, the valve opens; when the impeller stops, the valve closes, preventing blood pressure from opening it. The one-way valve 400 is fixed to the internal flow channel of the intermediate catheter segment by mechanical connection or bonding.

[0210] In other words, the one-way valve 400 is connected to the suction tube 100 and is located in the suction channel 103. The one-way valve 400 is located at the distal end of the filter element 200. The one-way valve 400 is used to prevent blood and thrombus 504 from flowing into the suction channel 103 from the distal end of the suction channel 103, but not from flowing out from the distal end of the suction channel 103.

[0211] FIG11 is a schematic structural diagram of a one-way valve 400 of a suction catheter according to some embodiments of the present application.

[0212] As shown in Figures 1 to 11, in some embodiments, the filter element 200 is connected to the distal suction tube. In one example, a one-way valve 400 can be provided at the suction inlet 101. In this embodiment, the thrombus 504 is confined within the distal suction tube by the filter element 200 and the one-way valve 400, and no thrombus 504 is present in the proximal suction tube. When the suction tube 100 is withdrawn from the body for cleaning, the distal suction tube can be directly replaced, which shortens the cleaning time of the suction tube 100 and thereby improves the suction efficiency of the interventional device.

[0213] In one example, the one-way valve 400 includes a first extension 410 and a second extension 420 along the axial direction X. The inner circumference of the first extension 410 is provided with multiple blocking flaps 430. In a natural state, the gaps 401 between the multiple blocking flaps 430 form a cross shape. The second extension 420 is positioned within the suction channel 103, while the second extension 420 is positioned outside the suction channel 103. When a thrombus 504 passes through, the gap 401 increases, and the side of the blocking flaps 430 facing away from the inner circumference of the first extension 410 extends toward the side closer to the second extension 420, and approaches the inner circumference of the first extension 410.

[0214] In other embodiments, the filter element 200 is connected to the second sleeve 141. In this embodiment, the thrombus 504 is similarly confined within the distal suction tube by the filter element 200 and the one-way valve 400, leaving the proximal suction tube free of thrombus 504. When the suction tube 100 is removed for external cleaning, the thrombus 504 within the distal suction tube can be directly removed after the second sleeve 141 is separated from the third sleeve 142. A simple flushing operation is then required for reassembly and subsequent intervention. Cleaning time for the suction tube 100 is also shortened.

[0215] The filter element 200 is made of metal material or polymer material, wherein the filter element 200 is constructed into a dense mesh structure or a claw-like structure, for example, by laser cutting or weaving.

[0216] In other embodiments, the one-way valve 400 can be disposed at the suction inlet 101. The filter element 200 is connected to the distal end of the distal suction tube and is close to the one-way valve 400. In this embodiment, because the filter element 200 is very close to the one-way valve 400, when the thrombus 504 is drawn into the suction channel 103, it is only squeezed and plasticized once before being collected by the filter element 200.

[0217] When the filter element 200 is farther from the one-way valve 400, the thrombus 504 is drawn into the suction channel 103 and is first squeezed and shaped by the one-way valve 400, and then squeezed and shaped by the mesh of the filter element 200. This multiple squeezing and shaping of the thrombus 504 requires a higher suction force. Therefore, connecting the filter element 200 to the distal end of the distal suction tube, close to the one-way valve 400, can reduce the suction force requirement of the suction catheter.

[0218] Furthermore, in some embodiments of the present application, the distal end of the first connecting section 110 further includes a developing ring 115, which is positioned 1 mm to 10 mm from the distal end of the distal suction catheter section. The supporting structure of developing ring 115 is constructed of platinum alloy, facilitating in vitro determination of catheter position and increasing radial support force on the end face to prevent collapse of the catheter orifice due to excessive negative pressure.

[0219] In addition, regarding the position arrangement of the developing ring 115, when it is set less than 1 mm from the farthest end of the first connecting segment 110, the head end of the first connecting segment 110 will be too hard, and there is a risk of damaging blood vessels or tissues; when it is set more than 10 mm from the farthest end of the first connecting segment 110, the developing ring 115 is too far away from the head end of the first connecting segment 110, making it impossible to accurately position the catheter.

[0220] FIG12 is a cross-sectional view of a suction catheter according to some embodiments of the present application.

[0221] As shown in Figure 12, in another embodiment of the present application, the suction duct also includes a tightening member 600, which is connected to the suction tube 100. The tightening member 600 is located on the side of the filter element 200 facing away from the outflow window. The tightening member 600 includes a tightening body 601, and the tightening body 601 protrudes inward along the radial direction of the suction duct relative to the axis L of the suction tube 100 to form a tightening channel 602, and the tightening channel 602 is connected to the internal flow channel.

[0222] In some embodiments of the present application, the tightening member 600 can be connected to the outside of the suction tube 100 or at least partially connected to the inside of the suction tube 100. For example, at least a portion of the tightening member 600 is placed in the suction channel 103. In one example, the tightening member 600 is completely placed in the suction channel 103, or a portion of the tightening member 600 is placed in the suction channel 103 and a portion is placed outside the suction channel 103.

[0223] In one example, the tightening member 600 may be disposed in the first connecting section 110. When the tightening member 600 is disposed in the suction conduit, no one-way valve is provided in the suction conduit.

[0224] In some embodiments of the present application, the tightening member 600 has a certain degree of rigidity. For example, the rigidity of the tightening member 600 is greater than the rigidity of the aspiration tube 100. In some examples, the tightening member 600 can be made of metal, nylon, polyethylene terephthalate (PET), polycarbonate (PC), etc. In other examples, a modified coating can be added to the inner wall 630 of the tightening member 600 to improve its smoothness, thereby facilitating the smooth passage of the thrombus 504.

[0225] In some embodiments of the present application, the tightening member 600 includes a tightening body 601 and a tightening channel 602. In the radial direction, at least a portion of the tightening body 601 protrudes inward relative to the axis L of the suction tube 100. The tightening channel 602 extends through the tightening body 601 along the axial direction X and communicates with the suction channel 103. At least a portion of the radial dimension of the tightening channel 602 is smaller than the radial dimension of the suction channel 103.

[0226] Illustratively, the tightening body 601 is entirely protruding inward, or a portion of the tightening body 601 protrudes inward and a portion engages with the suction tube 100 , or a portion of the tightening body 601 protrudes inward and a portion is recessed outward.

[0227] For example, a thrombus 504 enters the suction inlet 101, passes through the tightening member 600, and enters the suction channel 103. Blood is filtered out by the filter element 200 and discharged into the body through the suction outlet 102. When the thrombus 504 partially enters the tightening channel 602, the tightening body 601 captures the thrombus 504 and exerts a certain grip on the thrombus 504, preventing the thrombus 504 from falling out of the suction catheter. When the suction catheter loses suction force, when the thrombus 504 moves into the tightening channel 602, the tightening body 601 exerts a limiting resistance on the thrombus 504 due to the smaller inner diameter of at least part of the tightening channel 602, thereby preventing the thrombus 504 from escaping.

[0228] By arranging a tightening piece 600 on the side of the filter element 200 facing away from the outflow window in the suction tube 100, the tightening body 601 of the tightening piece 600 is protruding, so that when the thrombus 504 is sucked into the suction channel 103, the thrombus 504 is tightened, thereby reducing the risk of the thrombus 504 falling off. When the suction catheter is withdrawn or the negative pressure disappears, the tightening body 601 has the function of limiting the thrombus 504 and preventing it from escaping, thereby reducing the suction resistance of the suction catheter and improving the anti-fall-off effect of the suction catheter.

[0229] In some embodiments of the present application, the tightening body 601 includes a first end 610 and a second end 620. Along the first direction, the tightening channel 602 has a gradual contraction trend. The first end 610 is arranged between the second end 620 and the filter element 200, wherein the first direction extends from the first end 610 to the second end 620.

[0230] The first end 610 and the second end 620 of the tightening body 601 are oppositely arranged along the axial direction X, and the tightening channel 602 passes through the first end 610 and the second end 620 to form an opening.

[0231] The gradual contraction of the tightening channel 602 causes the tightening body 601 to continuously bulge inward relative to the axis L of the suction tube 100 . The inner diameter of the first end 610 is smaller than the inner diameter of the second end 620 .

[0232] By gradually converging the tightening channel 602, the tightening body 601 is now continuously protruded relative to the axis L of the suction tube 100 to reduce resistance, thereby reducing wear on the inner wall 630 of the tightening body 601 and making blood flow more stable, while being more conducive to the thrombus 504 entering the suction catheter.

[0233] In some embodiments of the present application, the tightening member 600 is arranged at the suction inlet 101, and along the axial direction X of the tightening channel 602, the second end 620 is located on the side of the suction inlet 101 facing away from the filter element 200, and the outer diameter of the tightening body 601 tends to gradually shrink along the first direction.

[0234] The tightening member 600 is disposed at the suction inlet 101 , so that the thrombus 504 enters the suction channel 103 through the tightening channel 602 .

[0235] In some embodiments of the present application, the tapering trend of the outer diameter of the tightening body 601 allows the wall thickness of the tightening body 601 from the first end 610 to the second end 620 to be equal or tapered.

[0236] In the present application, the tightening member 600 is positioned at the suction inlet 101 to minimize the effect on the length of the filter element 200. The second end 620 is located on the side of the suction inlet 101 facing away from the filter element 200, so that at least a portion of the tightening channel 602 is positioned outside the suction channel 103. By gradually tapering the tightening body 601 from closer to the filter element 200 to farther away from the filter element 200, damage to the blood vessel caused by the suction catheter during entry is reduced.

[0237] In other embodiments of the present application, along the first direction, the tightening channel 602 has a gradual contraction trend, and the outer diameter of the tightening body 601 has a gradual expansion trend, or the outer diameter of the tightening body 601 has no gradual change trend, that is, the outer wall of the tightening body 601 is equidistantly arranged relative to the axis L of the tightening channel 602.

[0238] FIG. 13 is an enlarged view of the tightening member 600 in FIG. 12 .

[0239] As shown in Figures 12 and 13, in some embodiments of the present application, the tightening body 601 includes a transition portion 604 and a tightening portion 603 distributed successively along the axial direction X of the tightening channel 602, the transition portion 604 is placed between the tightening portion 603 and the filter element 200, and the transition portion 604 is connected to the suction tube 100; the tightening body 601 includes a first end 610 and a second end 620, and the outer diameter of the tightening portion 603 has a gradual shrinking trend from the first end 610 to the second end 620, and the first end 610 is connected to the transition portion 604.

[0240] Exemplarily, the transition portion 604 is arranged straight along the axial direction X, and at least a portion of the transition portion 604 is stacked with the suction pipe 100 .

[0241] Exemplarily, the transition portion 604 may be positioned within the suction channel 103 or outside the suction channel 103 .

[0242] In one example, the transition portion 604 is placed in the suction channel 103 and overlaps with the suction pipe 100 ; or, a portion of the transition portion 604 is placed in the suction channel 103 and overlaps with the suction pipe 100 , and the other portion is suspended outside the suction pipe 100 .

[0243] In another example, the transition portion 604 is placed in the suction channel 103, and the tightening portion 603 is suspended outside the suction tube 100. The first end 610 of the tightening portion 603 is flush with the suction inlet 101, that is, the end surface of the tightening portion 603 is flush with the suction inlet 101.

[0244] In some examples, the transition portion 604 can be connected to the tightening portion 603 by bonding, snapping, or the like, or the tightening body 601 can be integrally formed.

[0245] For example, along the axial direction X, the length of the transition portion 604 may be smaller than the length of the tightening portion 603 , or greater than or equal to the length of the tightening portion 603 .

[0246] For example, the side of the transition portion 604 facing away from the tightening portion 603 abuts against the filter element 200, so that the filter element 200 has sufficient arrangement space, ensuring the effective working length of the filter element 200 and further ensuring the filtering effect.

[0247] The tightening portion 603 is connected to the suction pipe 100 via the transition portion 604 , which improves the connection reliability of the tightening portion 603 and facilitates the arrangement of the tightening portion 603 extending out of the suction inlet 101 .

[0248] In some embodiments of the present application, the transition portion 604 is placed in the suction channel 103. This reduces the maximum radial dimension of the suction catheter and facilitates entry into the blood vessel.

[0249] FIG14 is a cross-sectional view of another aspiration catheter provided in some embodiments of the present application.

[0250] As shown in Figure 14, in other embodiments of the present application, the tightening body 601 includes a first end 610 and a second end 620, and the tightening channel 602 has a gradual expansion trend along the first direction, wherein the first direction extends from the first end 610 to the second end 620; the circumferential side of the tightening body 601 is connected to the suction tube 100, and along the axial direction X of the tightening channel 602, the first end 610 is located between the second end 620 and the filter element 200.

[0251] The first end 610 and the second end 620 of the tightening body 601 are oppositely arranged along the axial direction X, and the tightening channel 602 passes through the first end 610 and the second end 620 to form an opening.

[0252] The tightening body 601 may be entirely placed in the suction channel 103 , or partially placed in the suction channel 103 and partially suspended outside the suction channel 103 .

[0253] The tightening channel 602 has a gradually expanding trend, that is, it gradually expands from the suction outlet 102 to the suction inlet 101. The inner diameter of the first end 610 is smaller than the inner diameter of the second end 620. In other words, the tightening channel 602 has a gradually expanding trend from the proximal end to the distal end.

[0254] For example, the outer diameter of the tightening body 601 may be gradually expanding or contracting or extend straight along the first direction.

[0255] By setting the tightening body 601 to gradually expand from the side close to the filter element 200 to the side away from the filter element 200, the tightening channel 602 of the tightening body 601 protrudes inward relative to the axis L of the suction tube 100 on the side close to the filter element 200. In addition to preventing the thrombus 504 in the suction channel 103 from escaping, the inner wall 630 of the tightening body 601 with a gradually expanding trend is used to guide the thrombus 504 entering the suction channel 103, thereby facilitating the suction of the thrombus 504.

[0256] FIG. 15 is an enlarged view of the tightening member 600 in FIG. 14 .

[0257] As shown in Figures 14 and 15, in a specific embodiment of the present application, the tightening body 601 includes a transition portion 604 and a tightening portion 603 distributed successively along the axial direction X of the tightening channel 602, the tightening portion 603 is placed between the transition portion 604 and the filter element 200, the transition portion 604 is placed in the inner flow channel, and is overlapped and connected with the suction pipe 100; the tightening portion 603 includes a first end 610 and a second end 620, and the inner diameter of the tightening portion 603 has a gradual expansion trend along the first direction, the second end 620 is connected to the transition portion 604, and the side of the transition portion 604 facing away from the second end 620 is flush with the suction inlet 101 along the axial direction X.

[0258] Exemplarily, the transition portion 604 is arranged straight along the axial direction X and is stacked with the suction pipe 100 .

[0259] In some examples, the transition portion 604 can be connected to the tightening portion 603 by bonding, snapping, or the like, or the tightening body 601 can be integrally formed.

[0260] For example, along the axial direction X, the length of the transition portion 604 may be smaller than the length of the tightening portion 603 , or greater than or equal to the length of the tightening portion 603 .

[0261] For example, the side of the tightening portion 603 facing away from the transition portion 604 abuts against the filter element 200. This provides sufficient space for the filter element 200, ensuring its effective working length and, therefore, the filtration effect. For example, the first end 610 is completely aligned with the suction inlet 101 along the axial direction X, with both being on the same plane or at the same height, without any protrusions or recesses.

[0262] By gradually expanding from the tightening portion 603 , the transition portion 604 is firmly connected to the suction pipe 100 , and the first end 610 of the tightening body 601 is flush with the suction inlet 101 to reduce the impact on the length of the filter element 200 and reserve sufficient space for the arrangement of the filter element 200 .

[0263] In another embodiment of the present application, along the axial direction X of the tightening channel 602, the tightening member 600 is located between the suction inlet 101 and the filter element 200, with a distance between the first end 610 and the suction inlet 101. The tightening member 600 is placed between the suction inlet 101 and the filter element 200 to provide support for the suction tube 100.

[0264] As shown in FIG. 12 to FIG. 15 , in some embodiments of the present application, an angle A between the inner wall 630 of the tightening body 601 and the axis L of the tightening channel 602 ranges from 1 degree to 10 degrees.

[0265] Exemplarily, the inner wall 630 of the tightening body 601 encloses and forms the tightening channel 602. In one example, the inner wall 630 is formed between the first end 610 and the second end 620, forming a gradual trend of the tightening channel 602.

[0266] In some examples, the inner wall 630 forms a converging or diverging trend that tightens the channel 602 .

[0267] As an example, the angle A between the inner wall 630 and the axis L may range from 2 degrees to 8 degrees. For example, the angle A between the inner wall 630 and the axis L is 2 degrees, 5 degrees, 6 degrees, or 8 degrees.

[0268] The angle of the inner wall 630 ranges from 1 degree to 10 degrees, which is beneficial for drawing in the thrombus 504 , controlling the suction resistance, and reducing the loss of suction pressure.

[0269] Furthermore, in some technical solutions, the suction tube 100 is not equipped with a tightening member 600. At rated speed, the pressure differential between the suction inlet 101 and the suction outlet 102 of the suction tube is tested, resulting in a pressure differential range of approximately 50 kPa. In this application, the pressure differential between the suction inlet 101 and the suction outlet 102 is measured for a suction tube formed by installing a tightening member 600 with an angle A of 5 degrees between the inner wall 630 and the axis L. Testing was conducted with both the converging and diverging configurations of the tightening channel 602. The pressure differentials generated by these two configurations were similar to the pressure differential without the tightening member 600, with the maximum difference being only 0.03%.

[0270] In the related art, a one-way valve 400 is provided in the suction channel 103 of the suction tube 100. The one-way valve 400 is placed between the suction inlet 101 and the filter element 200 to prevent the thrombus 504 that has entered the suction channel 103 from escaping. However, this increases the resistance of the thrombus 504 to entering the suction channel 103. Therefore, compared with the one-way valve 400 structure, the tightening member 600 of the present application reduces the impact of the pressure difference and flow rate generated by the suction catheter, while also preventing the thrombus 504 from escaping.

[0271] In one embodiment, the length of the tightening member 600 along the axial direction X of the tightening channel 602 is less than 1 / 20 of the length of the suction tube 100, so that the shorter the tightening member 600 is, the longer the effective length of the filter element 200 is. As an example, the length of the tightening member 600 is 1 mm to 20 mm.

[0272] FIG16 is a schematic cross-sectional view of a suction tube 100 of a suction catheter according to some embodiments of the present application.

[0273] As shown in FIG. 16 , in one embodiment, the tightening body 601 is placed in the suction channel 103 , and the tightening body 601 protrudes from the suction tube 100 at equal distances along the axial direction X.

[0274] Exemplarily, in a cross section along the axial direction X, the tightening body 601 is in the shape of two opposite rectangles.

[0275] FIG17 is a schematic diagram of an end face structure of the suction tube 100 in the suction catheter according to some embodiments of the present application.

[0276] As shown in Figure 17, in some embodiments of the present application, the tightening body 601 includes a transition portion 604 and a tightening portion 603, the transition portion 604 is at least partially located in the suction channel 103, and the transition portion 604 is connected between the suction tube 100 and the tightening portion 603; the tightening portion 603 includes a plurality of claws 613, and along the radial direction of the tightening channel 602, the claws 613 protrude inward relative to the transition portion 604, and the plurality of claws 613 are distributed at intervals along the circumferential Z direction of the transition portion 604.

[0277] For example, the radial protrusion sizes of the plurality of claws 613 may be the same or different.

[0278] For example, the intervals between the plurality of claw portions 613 along the axial direction X may be the same or different.

[0279] In one example, the transition portion 604 is in the shape of a closed or semi-closed ring.

[0280] In another example, along the circumferential direction Z of the tightening channel 602 , the transition portion 604 may include one or more segments.

[0281] The plurality of claws 613 are connected to the suction tube 100 via the transition portion 604 , thereby improving the connection firmness of the tightening body 601 .

[0282] The intervals between adjacent claws 613 reduce the suction resistance of the suction catheter, thereby improving the suction efficiency of the thrombus 504 . In addition, the fluidity of blood increases due to the intervals between the claws 613 , thereby reducing the risk of the thrombus 504 blocking the suction channel 103 .

[0283] FIG18 is a schematic diagram of another end face structure of the suction tube 100 in the suction catheter in some embodiments of the present application.

[0284] As shown in FIG. 14 to FIG. 18 , in some embodiments of the present application, the tightening body 601 is continuously arranged along the circumferential direction Z of the tightening channel 602 .

[0285] For example, along the circumferential direction Z, the tightening body 601 is a closed structure or has an opening. In other words, the tightening body 601 can be an open ring or a closed ring.

[0286] In one example, the transition portion 604 and the tightening portion 603 of the tightening body 601 are continuously arranged along the axial direction X.

[0287] The continuous arrangement of the tightening body 601 improves the overall strength of the tightening body 601 , reduces the risk of the tightening portion 603 being squeezed and deformed by the thrombus 504 , and improves the service life and reliability.

[0288] In some embodiments of the present application, the tightening body 601 is in a closed ring shape, which reduces manufacturing difficulty and cost.

[0289] In some embodiments of the present application, the material of the tightening body 601 includes a metal material.

[0290] Illustratively, the metal material may include platinum-iridium alloy, platinum alloy, stainless steel, nickel-titanium alloy, and the like.

[0291] The structure has sufficient strength to avoid deformation, reduce wear of the tightening member 600 during long-term use, and increase service life.

[0292] In some embodiments of the present application, the tightening body 601 and the suction tube 100 are laminated and bonded along the radial direction of the suction tube 100 .

[0293] For example, bonding can be achieved by adhesive materials such as glue and resin.

[0294] As an example, the glue may be epoxy resin, polyurethane glue, hot melt glue, etc.

[0295] In the present application, bonding is beneficial to reducing the impact on the diameter of the suction tube 100 and is beneficial to the connection with the suction tube 100 .

[0296] In one embodiment of the present application, the connecting assembly 140 includes a second sleeve 141 and a third sleeve 142. The end of the second sleeve 141 facing away from the third sleeve 142 abuts against the tightening member 600. This reduces the risk of large thrombi 504 entering the aspiration channel 103 and undergoing secondary shaping. The abutment between the second sleeve 141 and the tightening member 600 allows the large thrombus 504 to enter the tightening channel 602 and continuously enter the connecting assembly 140, requiring only a single shaping step before entering the aspiration channel 103, thereby reducing aspiration resistance.

[0297] In one example, the inner diameters of the second sleeve 141 , the third sleeve 142 , and the tightening member 600 are equal.

[0298] FIG19 is a schematic diagram of the suction catheter in FIG2 in an interventional state.

[0299] As shown in Figures 1 to 19, in one embodiment of the present application, the suction tube is flexible and bendable, and the suction catheter includes an intervention state. In the intervention state, the suction inlet 101 is located at a preset suction position 520, the suction outlet 102 is located at a preset drainage position 510, and the suction tube 100 extends from the preset suction position 520 through the intermediate transition zone 530 to the preset drainage position 510.

[0300] The intermediate transition zone 530 refers to an area with specific requirements. In some application scenarios, various parameters in the intermediate transition zone 530, such as flow rate, flow rate, pressure, and pressure differential, periodically fluctuate within a certain range. This is understandable. When the suction catheter is operating, if the suction outlet 102 is located in the intermediate transition zone 530, the suctioned and discharged liquid may cause at least one parameter in the intermediate transition zone 530 to exceed the preset fluctuation range, or may cause the periodic pattern of the intermediate transition zone 530 to change.

[0301] Similarly, if the suction inlet 101 is positioned in the intermediate transition zone 530, blood drawn by the suction catheter may cause at least one parameter of the intermediate transition zone 530 to exceed a preset floating range, or may cause the periodicity of the intermediate transition zone 530 to change. Therefore, the suction catheter provided herein, during suctioning, positions both the suction inlet 101 and the suction outlet 102 away from the intermediate transition zone 530, thereby minimizing the impact of the suction catheter on the intermediate transition zone 530 during operation.

[0302] In some implementations, the suction inlet 101 is configured to be opposite to the preset suction position 520, the suction outlet 102 is configured to be opposite to the preset discharge position 510, and the suction tube 100 between the suction inlet 101 and the suction outlet 102 is configured to be opposite to the intermediate transition zone 530. In some implementations, the entire suction tube 100 between the suction inlet 101 and the suction outlet 102 is configured to be opposite to the intermediate transition zone 530. In other alternative implementations, a portion of the suction tube 100 between the suction inlet 101 and the suction outlet 102 is configured to be opposite to the intermediate transition zone 530.

[0303] In the present application, by reasonably setting the shape and size of the suction catheter, when sucking the target object at the preset suction position 520, the suction outlet 102 can avoid the intermediate transition zone 530, avoid affecting the index parameters of the intermediate transition zone 530, and maintain the stability and periodicity of the intermediate transition zone 530.

[0304] In some implementations, the direction of liquid flow in the suction channel 103 is opposite to the direction of liquid flow outside the tube body. In other alternative implementations, the direction of liquid flow in the suction channel 103 is the same as the direction of liquid flow outside the tube body, or there is an angle between the direction of liquid flow in the suction channel 103 and the direction of liquid flow outside the tube body.

[0305] It can be understood that the suction catheter provided in the present application is suitable for a variety of application scenarios, especially for application scenarios where the liquid flow direction is opposite to the liquid flow direction outside the tube body, or there is an angle between the liquid flow direction in the suction channel 103 and the liquid flow direction outside the tube body, which can effectively reduce the reflux problem caused by conventional suction catheters.

[0306] In some embodiments, the axial X length of the suction tube 100 is 10 mm to 200 mm, and the intervention size of the suction tube 100 is 5F to 30F.

[0307] It can be understood that the suction tube 100 has a certain elasticity, so that when it is in the interventional state, it can bend and extend according to the direction of the blood vessels in the interventional environment until the suction inlet 101 is located at the preset suction position 520 and the suction outlet 102 is located at the preset drainage position 510. The suction tube 100 extends from the preset suction position 520 through the intermediate transition zone 530 to the preset drainage position 510.

[0308] In the interventional state, the suction inlet 101 and the suction outlet 102 of the suction catheter are located at the preset suction position 520 and the preset drainage position 510, respectively. The preset suction position 520 and the preset drainage position 510 are both located outside the intermediate transition zone 530, and the preset suction position 520 and the preset drainage position 510 are located on both sides of the intermediate transition zone 530. This allows the suction inlet 101 to aspirate blood and thrombus 504 at the preset suction position 520, thereby reducing the direct impact of the blood outside the preset suction position 520 on the intermediate transition zone 530, thereby reducing the load of the suction catheter on the intermediate transition zone 530. Furthermore, when the suction outlet 102 discharges blood at the preset drainage position 510, the direct impact of the blood discharged from the preset drainage position 510 on the intermediate transition zone 530 is reduced, thereby further reducing the load of the suction catheter on the intermediate transition zone 530.

[0309] Furthermore, in some embodiments of the present application, the suction catheter includes an interventional state. In the interventional state, along the axial direction X, the suction tube 100 includes a first suction segment 503, a second suction segment 502 and a third suction segment 501 arranged in sequence. The first suction segment 503, the second suction segment 502 and the third suction segment 501 jointly define a suction channel 103. The suction inlet is located in the first suction segment, and the suction outlet of the third suction segment is connected to the outflow tube. The angle between the extension direction of the first suction segment 503 and the extension direction of the second suction segment 502 is an acute angle, and the angle between the extension direction of the second suction segment 502 and the extension direction of the third suction segment 501 is an acute angle.

[0310] In some implementations, the first suction section 503 , the second suction section 502 , and the third suction section 501 form a “Z” shape or other plane or spatial shapes, which is not specifically limited in this application.

[0311] In the intervention state, the first connecting section 110 extends from the preset suction position 520 through the intermediate transition zone 530 and connects to the second connecting section 120 via the second sleeve 141 and the third sleeve 142. The second connecting section 120 extends from the intermediate transition zone 530 to the preset discharge position 510. It can be understood that the first suction section 503, the second suction section 502, and the third suction section 501 are jointly formed by the second connecting section 120 and the first connecting section 110. It can also be understood that the first suction section 503, the second suction section 502, and the third suction section 501 are the specific form of the suction tube 100 in an intervention state, while the second connecting section 120 and the first connecting section 110 are two separate tubes connected by the second sleeve 141 and the third sleeve 142. In the intervention state, at least part of the first suction segment 503 is composed of the first connecting segment 110, at least part of the third suction segment 501 is composed of the second connecting segment 120, and the second suction segment 502 can be composed of any one of the first connecting segment 110 and the second connecting segment 120, or, part of the second suction segment 502 is composed of the first connecting segment 110 and the other part is composed of the second connecting segment 120.

[0312] In some embodiments, the axial X lengths of the first suction segment 503 , the second suction segment 502 , and the third suction segment 501 are all greater than or equal to 5 mm and less than or equal to 60 mm.

[0313] FIG20 is a schematic diagram of an interventional state in which a suction catheter according to some embodiments of the present application is used to aspirate a thrombus 504 in a pulmonary artery 540 .

[0314] As shown in Figures 1 to 20, in some embodiments of the present application, the suction catheter is used to aspirate the thrombus 504. In the interventional state, the suction inlet 101 is located at the pulmonary artery 540, the outflow window is located at the intersection of the inferior vena cava 560 and the superior vena cava 580, and the first suction segment 503, the second suction segment 502 and the third suction segment 501 are at least partially located in the right ventricle 550 and the right atrium 570.

[0315] In some embodiments, the aspiration catheter is used to aspirate thrombus 504. The preset aspiration location 520 is the pulmonary artery 540, the preset drainage location 510 is the intersection of the inferior vena cava 560 and the superior vena cava 580, and the intermediate transition zone 530 is the right ventricle 550 and right atrium 570. When the aspiration catheter is aspirating thrombus 504 in the pulmonary artery 540, the aspiration outlet 102 can remain at the confluence of the superior vena cava 580 and the inferior vena cava 560, while the more flexible aspiration tube 100 bends and extends, sequentially passing through the right atrium 570 and the right ventricle 550, ultimately positioning the distal aspiration inlet 101 in the pulmonary artery 540. This allows blood flowing out of the aspiration channel 103 from the aspiration outlet 102 to first mix with venous blood at the confluence of the superior vena cava 580 and the inferior vena cava 560 before entering the heart, thereby avoiding direct impact on the heart and overloading the right ventricle 550.

[0316] And since the suction inlet 101 and the suction outlet 102 are respectively located at the confluence of the pulmonary artery 540 and the superior vena cava 580 and inferior vena cava 560, the direction of liquid flow in the suction channel 103 is from the pulmonary artery 540 through the right ventricle 550 and the right atrium 570 to the confluence of the superior vena cava 580 and the inferior vena cava 560, and the direction of liquid flow outside the tube body is from the confluence of the superior vena cava 580 and the inferior vena cava 560 through the right atrium 570 and the right ventricle 550 to the pulmonary artery 540. The direction of liquid flow in the suction channel 103 is opposite to the direction of liquid flow outside the suction tube 100.

[0317] Since the suction inlet 101 and the suction outlet 102 avoid the heart in the interventional state, the suctioned blood and the discharged blood are not directly located in the heart chamber, thereby reducing the load on the heart during the operation of the suction catheter.

[0318] Of course, in other embodiments, the preset suction position 520, the preset drainage position 510, and the intermediate transition zone 530 may also be other areas. For example, the intermediate transition zone 530 may be a chamber in the heart, and the preset suction position 520 or the preset drainage position 510 may be another chamber in the heart. Alternatively, the intermediate transition zone 530 may be a vein, and the preset suction position 520 and the preset drainage position 510 may be another vein.

[0319] The suction catheter provided in the present application is configured such that, in the interventional state, the angle between the extension direction of the first suction segment 503 and the extension direction of the second suction segment 502 is an acute angle, and the angle between the extension direction of the second suction segment 502 and the extension direction of the third suction segment 501 is an acute angle, so that the suction tube 100 can bend at least twice and pass through the heart, so that the suction inlet 101 is located at the pulmonary artery 540 and the suction outlet 102 is located at the intersection of the superior and inferior vena cava 560, thereby realizing the function of the suction catheter to aspirate the thrombus 504 in the pulmonary artery 540 and transport the aspirated blood back to the intersection of the superior and inferior vena cava 560.

[0320] By making the axial X lengths of the first suction segment 503 , the second suction segment 502 and the third suction segment 501 greater than or equal to 5 mm and less than or equal to 60 mm, the length of each segment of the suction tube 100 meets the requirement of passing through the heart.

[0321] In some optional embodiments, an outflow window 310 is provided on the outflow channel 301, communicating with the suction outlet 102. In the interventional state, the outflow window 310 is located at a predetermined drainage position 510, enabling the suction catheter to aspirate the thrombus 504 in the pulmonary artery 540 and return the aspirated blood to the junction of the superior and inferior vena cava 560.

[0322] In some embodiments of the present application, the thrombectomy training method using a suction catheter is also applicable to the deep veins of the lower limbs and cerebral blood vessels.

[0323] It should be noted that the proximal side in the present application refers to the side of a component that is closer to the proximal end relative to another component, and the distal side refers to the side of a component that is closer to the distal end relative to another component.

[0324] An embodiment of the present application also provides a suction system, comprising the suction catheter of the above embodiment.

[0325] Specifically, the suction system includes a delivery sheath 10 and a suction catheter. The delivery sheath 10 is provided with a first passage 11. In the interventional state, at least a portion of the suction catheter is located within the first passage 11, and the suction outlet 102 extends from the proximal end of the delivery sheath 10 into the first passage 11 and from the distal end of the delivery sheath 10 out of the first passage 11. The suction inlet 101 is located at a preset suction position 520, and the suction outlet 102 is located at a preset drainage position 510. The tube body extends from the preset suction position 520 through the intermediate transition zone 530 to the preset drainage position 510. When the suction tube 100 extends into the first passage 11 within the delivery sheath 10 along the axial direction X, the central axis of the suction tube 100 is coaxial with the central axis of the delivery sheath 10.

[0326] The suction system further includes a second state and a separated state. In the second state, at least part of the suction catheter is located in the first passage 11, and the outflow window 310 is covered by the delivery sheath 10. In the separated state, the delivery sheath 10 and the suction catheter are relatively separated.

[0327] For example, in the second state, the suction catheter and the delivery sheath 10 are locked by a locking mechanism to prevent displacement during the suction operation. In the separated state, the locking mechanism is opened and the two are released to achieve the withdrawal of the suction catheter.

[0328] During the use of the suction system, the suction system is first in a separated state. The guidewire is first used to insert the delivery sheath 10 from the femoral vein to the designated position. The guidewire is then withdrawn, and the delivery sheath 10 is left in the patient's body. The first passage 11 of the delivery sheath 10 is then used to insert the suction catheter. During the intervention, contrast agents and DSA (digital subtraction angiography) are used to determine the insertion position of the suction catheter until the distal end of the suction tube 100 approaches the thrombus 504. At this point, the suction system is in a second state, and the delivery sheath 10 covers the outflow window 310. The delivery sheath 10 is then withdrawn proximally for a distance, exposing the outflow window 310 from the first passage 11, so that the suction system is in a separated state and begins to aspirate the thrombus 504.

[0329] In the separated state, the filter element 200 intercepts the thrombus 504 within the suction channel 103, while blood passes through the filter element 200 and flows back into the patient's blood vessels through the outflow window 310 on the outflow channel 301. When the suction catheter is filled with thrombus 504, the delivery sheath 10 is first re-advanced a distance distally so that it re-covers the outflow window 310. When the suction system switches back to the second state, the suction catheter is withdrawn from the body to clean the thrombus 504 or replace the suction tube 100. The previous process is then repeated, performing a second insertion of the suction catheter and suctioning the thrombus 504. Once the thrombus 504 is completely aspirated, the suction catheter and delivery sheath 10 are withdrawn, and the wound is sutured.

[0330] It can be understood that the delivery sheath 10 has a certain elasticity, so that when the suction catheter is inserted into the delivery sheath 10, the delivery sheath 10 will be wrapped around the outside of the suction catheter. This application does not specifically limit the cross-section of the delivery sheath 10 in its natural state. Any cross-sectional form of the delivery sheath 10 that can ensure the wrapping effect is within the scope of protection of this application, and this application does not make specific limitations on this.

[0331] The suction tube 100 also has a certain degree of elasticity, and its elasticity is greater than that of the delivery sheath 10. When the suction catheter is aspirating the thrombus 504 in the pulmonary artery 540, the distal end of the delivery sheath 10 and the outflow channel 301 can stay at the confluence of the superior vena cava 580 and the inferior vena cava 560, while the suction tube 100 with greater elasticity bends and extends and passes through the right atrium 570 and the right ventricle 550 in sequence, ultimately positioning the distal suction port of the suction tube 100 at the preset suction position 520, i.e., the pulmonary artery 540. This not only allows the more rigid outflow channel 301 and the delivery sheath 10 to avoid intervening in the heart, thus reducing the difficulty of intervention, but also allows the blood flowing out of the outflow window 310 to first mix with venous blood in the superior vena cava 580 and the inferior vena cava 560 before entering the heart, thereby avoiding direct impact on the heart and causing excessive load on the right ventricle 550.

[0332] The delivery sheath 10 can establish a stable passage after the intervention, so that the suction catheter can be inserted into the designated position through the first passage 11. At this time, the intervention device is in the first state, the outflow window 310 is located outside the first passage 11, and the suction catheter can normally aspirate the thrombus 504. When the thrombus 504 in the suction catheter is full, the suction catheter can be withdrawn from the body for cleaning or replacement, while the delivery sheath 10 remains in the intervention position, which is convenient for the subsequent secondary intervention of the suction catheter. The secondary intervention does not require the re-intervention of the guidewire, which simplifies the process of aspirating the thrombus 504, thereby improving the aspiration efficiency of the intervention device, while reducing the multiple interventions of the guidewire and reducing the probability of hemoptysis in the patient. By first inserting the delivery sheath 10 a distance to the distal end before withdrawing the suction catheter, the suction catheter can accurately return to the previous intervention position when it intervenes again, reducing the positioning steps and further improving the aspiration efficiency of the intervention device.

[0333] FIG. 21 is a flow chart of a thrombus removal training method according to some embodiments of the present application.

[0334] As shown in Figures 1 to 21, some embodiments of the present application provide a suction catheter-based thrombectomy training method, including: the thrombectomy training method is used to remove a thrombus 504 in a pulmonary artery 540; the training method is performed on a human model, wherein the human model has a simulated heart and simulated blood vessels, the simulated blood vessels including a femoral vein, a superior vena cava 580, an inferior vena cava 560, and a pulmonary artery 540, forming a closed circulation loop between the simulated heart and the simulated blood vessels; a colored liquid is injected into the simulated blood vessels to simulate blood, and a hydrogel is filled into the pulmonary artery 540 to simulate a thrombus 504; the thrombectomy training method includes the following steps:

[0335] S1: Through femoral vein puncture, the delivery sheath 10 is delivered to the thrombus 504 of the pulmonary artery 540 through the femoral vein, the inferior vena cava 560, the right atrium 570 of the simulated heart, and the right ventricle 550 of the simulated heart.

[0336] Specifically, through femoral vein puncture, the guide wire and delivery sheath 10 are sequentially passed through the femoral vein, inferior vena cava 560 , right atrium 570 of the simulated heart, and right ventricle 550 of the simulated heart and then pushed to the preset suction position 520 , which is the pulmonary artery 540 .

[0337] It should be understood that, in this application, pushing a component to a preset suction position 520 means that a preset portion of the component is in a preset relative position to the preset suction position 520. For example, pushing a guidewire to the preset suction position 520 may mean pushing the guidewire until its distal end is opposite the preset suction position 520. For another example, pushing the delivery sheath 10 to the preset suction position 520 may mean pushing the delivery sheath 10 until its distal end is opposite the preset suction position 520. Such concepts will not be repeatedly defined below.

[0338] S2: The suction catheter is moved along the delivery sheath 10 so that the suction inlet 101 of the suction catheter reaches the thrombus 504 of the pulmonary artery 540 , and the suction outlet 102 of the suction catheter is placed at the junction of the inferior vena cava 560 and the superior vena cava 580 .

[0339] Specifically, the guide wire and the sheath core are withdrawn, and the delivery sheath 10 is left at the preset suction position 520. The suction catheter is pushed along the delivery sheath 10 to the preset suction position 520. The sheath core can be a dilator.

[0340] S3: withdrawing the delivery sheath 10 until the outflow window 310 is exposed.

[0341] Specifically, the delivery sheath 10 is withdrawn to a preset drainage position 510 , exposing the suction outlet 102 of the suction tube 100 . The preset drainage position 510 is located at the intersection of the inferior vena cava 560 and the superior vena cava 580 , and the outflow window 310 is exposed.

[0342] It is understood that, corresponding to the aforementioned advancement to the preset suction position 520, retracting a component to the preset drainage position 510 means that a preset portion of the component is in a preset relative position to the preset drainage position 510. For example, retracting the delivery sheath 10 to the preset drainage position 510 may involve retracting the delivery sheath 10 until the distal end of the delivery sheath 10 is positioned around the preset drainage position 510, exposing the suction outlet 102 so that the suction outlet 102 is opposite the preset drainage position 510. This concept will not be further defined below.

[0343] In some embodiments of the present application, the thrombus removal training method further includes:

[0344] S4: Push the delivery sheath 10 back to the suction inlet 101. In other words, push the delivery sheath 10 back to the preset suction position 520.

[0345] S5: The suction catheter is withdrawn and the thrombus 504 in the suction catheter is cleared.

[0346] S6: Push the aspiration catheter along the delivery sheath 10 to the thrombus 504 again. In other words, push the aspiration catheter along the delivery sheath 10 to the preset aspiration position 520 again.

[0347] S7: retract the delivery sheath 10 again to expose the outflow window 310. Specifically, retract the delivery sheath 10 again to the preset liquid discharge position 510, so that the delivery sheath 10 exposes the suction outlet 102 of the suction tube 100 and further exposes the outflow window 310.

[0348] The thrombus removal training method provided herein allows the aspiration catheter to be removed from the body for cleaning or replacement when the aspiration catheter is full of thrombus 504, while the delivery sheath 10 remains in the interventional position, facilitating subsequent secondary aspiration catheter intervention. Furthermore, the secondary intervention does not require reintroduction of a guidewire, simplifying the aspiration process for thrombus 504 and thereby improving the aspiration efficiency of the interventional device. This also reduces the need for multiple guidewire insertions, thereby reducing the patient's risk of hemoptysis.

[0349] By moving the delivery sheath 10 a distance distally before withdrawing the suction catheter, the suction catheter can accurately return to the previous insertion position when it is inserted again, reducing the positioning steps and further improving the suction efficiency of the interventional device.

[0350] In the interventional state, the suction inlet 101 and the suction outlet 102 of the suction catheter are located at the preset suction position 520 and the preset drainage position 510, respectively. The preset suction position 520 and the preset drainage position 510 are both located outside the intermediate transition zone 530, and the preset suction position 520 and the preset drainage position 510 are located on both sides of the intermediate transition zone 530. This allows the suction inlet 101 to aspirate blood and thrombus 504 at the preset suction position 520, thereby reducing the direct impact of the blood outside the preset suction position 520 on the intermediate transition zone 530, thereby reducing the load of the suction catheter on the intermediate transition zone 530. Furthermore, when the suction outlet 102 discharges blood at the preset drainage position 510, the direct impact of the blood discharged from the preset drainage position 510 on the intermediate transition zone 530 is reduced, thereby further reducing the load of the suction catheter on the intermediate transition zone 530.

[0351] In addition, the present application also provides a thrombectomy training system, comprising a manikin, a delivery sheath 10, and the aspiration catheter described in the aforementioned embodiment. The manikin houses a simulated heart and simulated blood vessels, including the femoral vein, superior vena cava 580, inferior vena cava 560, and pulmonary artery 540. The simulated heart and blood vessels form a closed circuit. A colored liquid is injected into the simulated blood vessels, while a hydrogel is filled into the pulmonary artery 540 to simulate a thrombus 504.

[0352] The thrombectomy training system includes an intervention state, a second state, and a separation state. In the intervention state, the delivery sheath 10 is punctured through the femoral vein, sequentially passed through the femoral vein, the inferior vena cava 560, the right atrium 570 of the simulated heart, and the right ventricle 550 of the simulated heart, and then pushed to the preset suction position 520, which is the pulmonary artery 540. At least a portion of the suction catheter is located within the first passage 11, and the suction outlet 102 extends from the proximal end of the delivery sheath 10 into the first passage 11 and from the distal end of the delivery sheath 10 out of the first passage 11. The suction inlet 101 is located at the preset suction position 520, and the suction outlet 102 is located at the preset drainage position 510. The suction tube 100 extends from the preset suction position 520 through the intermediate transition zone 530 to the preset drainage position 510.

[0353] In one example, the suction inlet 101 is located at a preset suction position 520 , the outflow window is located at a preset discharge position 510 , and the suction tube 100 extends from the preset suction position 520 through the intermediate transition area 530 to the preset discharge position 510 .

[0354] In the second state, the suction inlet 101 is still located at the preset suction position 520 , and the suction outlet 102 is still located at the preset drainage position 510 . At least a portion of the suction catheter is located in the first passage 11 , and the outflow window 310 is covered by the delivery sheath 10 .

[0355] In the separated state, the distal end of the delivery sheath 10 is located at the preset suction position 520 , the delivery sheath 10 and the suction catheter are relatively separated, and the suction catheter is withdrawn outside the human body model.

[0356] In some optional implementations, the thrombus removal training aspects described in the above embodiments may be used in the thrombus removal training system of this embodiment.

[0357] The thrombectomy training system provided by the present application allows the aspiration catheter to be removed from the body for cleaning or replacement when the aspiration catheter is full of thrombi 504, while the delivery sheath 10 remains in the intervention position. This facilitates subsequent secondary intervention with the aspiration catheter, and the secondary intervention does not require reintroduction of the guidewire, thus simplifying the aspiration process of the thrombus 504 and thereby improving the aspiration efficiency of the interventional device. This also reduces the need for multiple guidewire interventions and the probability of hemoptysis in patients. By re-introducing the delivery sheath 10 a distance distally before withdrawing the aspiration catheter, the aspiration catheter can be accurately returned to the previously inserted position upon reintroduction, reducing the number of positioning steps and further improving the aspiration efficiency of the interventional device. In the interventional state, the suction inlet 101 and the suction outlet 102 of the suction catheter are located at the preset suction position 520 and the preset drainage position 510, respectively. The preset suction position 520 and the preset drainage position 510 are both located outside the intermediate transition zone 530, and the preset suction position 520 and the preset drainage position 510 are located on both sides of the intermediate transition zone 530. This allows the suction inlet 101 to aspirate blood and thrombus 504 at the preset suction position 520, thereby reducing the direct impact of the blood outside the preset suction position 520 on the intermediate transition zone 530, thereby reducing the load of the suction catheter on the intermediate transition zone 530. Furthermore, when the suction outlet 102 discharges blood at the preset drainage position 510, the direct impact of the blood discharged from the preset drainage position 510 on the intermediate transition zone 530 is reduced, thereby further reducing the load of the suction catheter on the intermediate transition zone 530.

[0358] The above description is only a specific embodiment of the present application. Those skilled in the art will clearly understand that for the convenience and brevity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the scope of protection of the present application.

Claims

1. A suction catheter, characterized in that: An inner flow channel extending in the axial direction is formed, and the suction conduit comprises: A suction pipe, the suction pipe comprising a first connecting section and a second connecting section arranged in an axial direction; an outflow pipe, wherein the inner flow channel is connected to the first connecting section, the second connecting section and the outflow pipe along the axial direction; a filter element, the filter element being disposed in the inner flow channel; The suction pipe is formed with a suction inlet, the outflow pipe is formed with an outflow window, the inner flow channel communicates with the suction inlet and the outflow window, and at least one of the connections among the first connecting section, the second connecting section and the outflow pipe includes a detachable connection.

2. The suction catheter according to claim 1, characterized in that The filter element is arranged in the inner flow channel corresponding to the suction pipe.

3. The suction catheter according to claim 1 or 2, characterized in that The outflow pipe is detachably connected to the second connecting section.

4. The suction catheter according to claim 3, characterized in that It also includes a drive assembly, which is at least partially installed in the outflow tube and is used to form a negative pressure in the inner flow channel.

5. The suction catheter according to claim 4, characterized in that The driving assembly includes an impeller mechanism, and the outflow window is opened in the circumference of the outflow pipe; Along the axial direction, at least a portion of the impeller mechanism is disposed opposite to the outflow window.

6. The suction catheter according to claim 5, characterized in that The suction pipe further includes a first sleeve, wherein the first sleeve is provided with a first connecting groove; The suction catheter also includes a first connecting block, one of the first connecting block and the first sleeve is connected to the outflow tube, and the other is connected to the second connecting section. When the second connecting section is connected to the outflow tube, the first connecting block is accommodated in the first connecting groove to limit the movement of the outflow tube relative to the suction tube.

7. The suction catheter according to claim 6, characterized in that The first connecting groove penetrates the wall thickness of the first sleeve, and the first connecting groove includes a first section and a second section, the first section extends along the axial direction, the second section extends along the circumferential direction of the first sleeve, and an end of the first section facing away from the outflow window is connected to one end of the second section; The axial dimension of the middle portion of the second section is smaller than the axial dimensions of both sides of the middle portion, and the first connecting block is placed on the side of the middle portion of the second section facing away from the first section.

8. The suction catheter according to claim 1 or 2, characterized in that: The first connecting section and the second connecting section are detachably connected.

9. The suction catheter according to claim 8, characterized in that The suction pipe further includes a connecting assembly, the connecting assembly including a second sleeve and a third sleeve arranged along the axial direction, the second sleeve is connected to the first connecting section, and the third sleeve is connected to the second connecting section; The second sleeve includes a clamping section and a first sealing section connected along the axial direction, the first sealing section is provided on a side of the clamping section facing away from the suction inlet, and the clamping section is provided with a plurality of second connecting blocks along the circumference of the second sleeve; The third sleeve includes a plurality of second connecting grooves arranged along its circumference, the second connecting block is placed in the second connecting groove, a portion of the filter element is placed in the third sleeve, and a portion of the filter element abuts against the third sleeve through the first sealing section.

10. The suction catheter according to claim 9, characterized in that The connecting assembly is placed at an end of the suction pipe facing away from the outflow pipe.

11. The suction catheter according to claim 8, characterized in that The first connecting section and the second connecting section partially overlap along the axial direction, and the first connecting section includes a first body section, a second sealing section, and a first fastening section sequentially arranged along the axial direction; The second connecting section includes a second body section, a second fastening section and a third sealing section arranged in sequence along the axial direction. The third sealing section is placed in the second sealing section and is interference-connected with the second sealing section. The second fastening section is threadedly connected to the first fastening section.

12. The aspiration catheter according to claim 11, wherein The outer diameter of the first body segment has a gradually decreasing trend from the second sealing segment toward the suction inlet.

13. The aspiration catheter according to claim 8, wherein The first connecting segment includes a first body segment, and the first body segment includes an outer layer, an intermediate layer, and an inner layer stacked in a radial direction, wherein the intermediate layer is disposed between the outer layer and the inner layer; The outer layer comprises a medical polymer material, the middle layer comprises a metal, and the friction coefficient of the inner layer is 0.01 to 0.

1.

14. The aspiration catheter according to claim 8, wherein The hardness of the first connecting segment decreases gradually from the second connecting segment to the first connecting segment.

15. The suction catheter according to claim 1 or 2, characterized in that A one-way valve is also included. The one-way valve is arranged on a side of the filter element facing away from the outflow window and is at least partially placed in the inner flow channel.

16. The suction catheter according to claim 1 or 2, characterized in that It also includes a tightening piece, which is connected to the suction pipe and is located on the side of the filter element facing away from the outflow window. The tightening piece includes a tightening body, which protrudes inwardly along the radial direction of the suction duct relative to the axis of the suction pipe to form a tightening channel, and the tightening channel is connected to the inner flow channel.

17. The aspiration catheter according to claim 16, wherein The tightening body includes a first end and a second end. Along a first direction, the tightening channel has a gradually shrinking trend, and the first end is arranged between the second end and the filter element, wherein the first direction extends from the first end to the second end.

18. The aspiration catheter according to claim 17, wherein The tightening member is arranged at the suction inlet. Along the axial direction of the tightening channel, the second end is located at the side of the suction inlet facing away from the filter element, and the outer diameter of the tightening body is gradually reduced along the first direction.

19. The aspiration catheter according to claim 18, wherein The tightening body includes a transition portion and a tightening portion successively distributed along the axial direction of the tightening channel, the transition portion is disposed between the tightening portion and the filter element, the transition portion is disposed in the inner flow channel, and the transition portion is connected to the suction pipe; The tightening portion includes the first end and the second end. Along the first direction, the outer diameter of the tightening portion has a gradually shrinking trend. The first end is connected to the transition portion.

20. The aspiration catheter according to claim 16, wherein The tightening body comprises a first end and a second end, and the tightening channel has a gradually expanding trend along a first direction, wherein the first direction extends from the first end to the second end; The circumferential side of the tightening body is connected to the suction pipe, and along the axial direction of the tightening channel, the first end is located between the second end and the filter element.

21. The suction catheter according to claim 1 or 2, characterized in that The suction tube is flexible and bendable, and the suction catheter includes an intervention state. In the intervention state, along the axial direction, the suction tube includes a first suction segment, a second suction segment, and a third suction segment arranged in sequence, the first suction segment, the second suction segment, and the third suction segment jointly defining a suction channel, and the suction inlet is located in the first suction segment; An angle between an extension direction of the first suction section and an extension direction of the second suction section is an acute angle, and an angle between an extension direction of the second suction section and an extension direction of the third suction section is an acute angle.

22. The aspiration catheter according to claim 21, wherein The suction catheter is used to aspirate thrombus. In the interventional state, the suction inlet is located in the pulmonary artery, the outflow window is located at the junction of the inferior vena cava and the superior vena cava, and the first suction segment, the second suction segment and the third suction segment are at least partially located in the right ventricle and right atrium.

23. A suction system, characterized in that: A suction catheter comprising the aspiration catheter of any one of claims 1 to 22.

24. A thrombectomy training method based on the aspiration catheter according to any one of claims 1 to 22, characterized in that: include: The thrombectomy training method is used to remove thrombi in pulmonary arteries. The training method is performed on a human model having a simulated heart and simulated blood vessels inside the model. The simulated blood vessels include the femoral vein, the superior vena cava, the inferior vena cava, and the pulmonary artery, forming a closed circulation loop between the simulated heart and the simulated blood vessels. A colored liquid is injected into the simulated blood vessels to simulate blood, and a hydrogel is filled into the pulmonary artery to simulate a thrombus. The thrombectomy training method is characterized in that it comprises the following steps: Through femoral vein puncture, the delivery sheath is delivered to the thrombus site of the pulmonary artery through the femoral vein, inferior vena cava, right atrium of the simulated heart, and right ventricle of the simulated heart; The suction catheter is placed along the delivery sheath so that the suction inlet of the suction catheter reaches the thrombus in the pulmonary artery and the outflow window of the suction catheter is placed at the junction of the inferior vena cava and the superior vena cava; The delivery sheath is withdrawn until the outflow window of the aspiration catheter is exposed.

25. The thrombus removal training method according to claim 24, characterized in that: Also includes: Pushing the delivery sheath back to the suction inlet; withdrawing the suction catheter and clearing the thrombus in the suction catheter; Pushing the suction catheter along the delivery sheath to the thrombus again; The delivery sheath is retracted again until the outflow window is exposed.

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