Suction catheter and suction system

Abstract

The utility model relates to the field of medical instruments, and discloses a suction catheter and a suction system.The suction catheter comprises a suction pipe, a filtering part and a tightening part, and the suction pipe comprises a suction inlet, a pipe cavity and a suction outlet; the filtering piece is arranged in the pipe cavity; the tightening piece is located on the side, opposite to the suction outlet, of the filtering piece and comprises a tightening body, the tightening body protrudes inwards relative to the axis of the suction pipe in the radial direction of the suction pipe to form a tightening channel, and the tightening channel communicates with the pipe cavity. The tightening piece is arranged on the side, opposite to the filtering piece, of the suction pipe, and the tightening body of the tightening piece is arranged in a protruding mode, so that in the process that thrombus is sucked into the pipe cavity, the thrombus locally entering the pipe cavity is captured, the risk that the thrombus falls off is reduced, and in the process that the suction catheter is withdrawn or negative pressure disappears, the tightening body has the limiting and anti-escape effects on the thrombus; the suction resistance of the suction catheter is reduced, and the anti-falling effect of the suction catheter is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of medical devices, and particularly relates to an aspiration catheter and an aspiration system. BACKGROUND

[0002] In a cardiovascular intervention operation, the cleaning of a blood clot is a key link. In a working process of a traditional aspiration catheter, the blood clot is prone to fall off or escape, causing operation risks and poor effects. Therefore, an aspiration catheter capable of effectively preventing the blood clot from falling off and escaping is needed. CONTENT OF THE UTILITY MODEL

[0003] Embodiments of the present application provide an aspiration catheter and an aspiration system, which can improve the blood clot fall-off and escape prevention effect.

[0004] In one aspect, some embodiments of the present application provide an aspiration catheter, comprising an aspiration pipe, a filter and a tightening member, the aspiration pipe comprising a suction inlet, a pipe cavity and a suction outlet which are distributed successively in an axial direction of the aspiration pipe; the filter is arranged in the pipe cavity; the tightening member is connected to the aspiration pipe and located on a side of the filter away from the suction outlet, the tightening member comprises a tightening body, the tightening body is convex inward along a radial direction of the aspiration catheter to form a tightening channel, and the tightening channel is in communication with the pipe cavity.

[0005] In some embodiments of the present application, the tightening body comprises a first end and a second end, and along a first direction, the tightening channel has a tapering trend, and the first end is arranged between the second end and the filter, wherein the first direction extends from the first end to the second end.

[0006] In some embodiments of the present application, the tightening member is arranged at the suction inlet, and along an axial direction of the tightening channel, the second end is located on a side of the suction inlet away from the filter, and along the first direction, an outer diameter of the tightening body has a tapering trend.

[0007] In some embodiments of the present application, the tightening body comprises a connecting portion and a tightening portion which are successively arranged along an axial direction of the tightening channel, the connecting portion is arranged between the tightening portion and the filter, and the connecting portion is connected to the aspiration pipe; the tightening portion comprises the first end and the second end, and along the first direction, an outer diameter of the tightening portion has a tapering trend, and the first end is connected to the connecting portion.

[0008] In some embodiments of the present application, the connecting portion is arranged in the pipe cavity.

[0009] In some embodiments of the present application, the tightening body comprises a first end and a second end, and the tightening channel has a diverging trend in a first direction extending from the first end to the second end; a side of the tightening body is connected to the suction tube, and the first end is located between the second end and the filter along an axial direction of the tightening channel.

[0010] In some embodiments of the present application, the tightening body comprises a connecting portion and a tightening portion successively arranged along an axial direction of the tightening channel, the tightening portion is arranged between the connecting portion and the filter, the connecting portion is arranged in the lumen and connected to the suction tube in an overlapping manner; the tightening portion comprises the first end and the second end, and an inner diameter of the tightening portion has a diverging trend in the first direction, the second end is connected to the connecting portion, and a side of the connecting portion opposite to the second end is flush with the suction port along the axial direction.

[0011] In some embodiments of the present application, an included angle between an inner wall of the tightening body and an axis of the tightening channel ranges from 1 degree to 10 degrees.

[0012] In some embodiments of the present application, the tightening body comprises a connecting portion and a tightening portion, the connecting portion is at least partially arranged in the lumen, and the connecting portion is connected between the suction tube and the tightening portion; the tightening portion comprises a plurality of claw portions, the claw portions protrude inward relative to the connecting portion along a radial direction of the tightening channel, and the plurality of claw portions are spaced apart along a circumferential direction of the connecting portion.

[0013] In some embodiments of the present application, the tightening body is continuously arranged along a circumferential direction of the tightening channel.

[0014] In some embodiments of the present application, a material of the tightening body comprises a metal material.

[0015] In another aspect, the present application also provides a suction system comprising the above-mentioned suction catheter.

[0016] The suction catheter and the suction system of the embodiments of the present application set the tightening member on a side of the suction tube opposite to the filter, and the tightening body of the tightening member protrudes outward, so that the blood clots locally entering the lumen are captured during the suction of the blood clots into the lumen, and the risk of the blood clots falling off is reduced. During the withdrawal of the suction catheter or the disappearance of the negative pressure, the tightening body limits the free blood clots from escaping, reduces the suction resistance of the suction catheter, and improves the anti-falling effect of the suction catheter. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced. Those drawings can help the ordinary skilled in the art to obtain other drawings without any creative effort.

[0018] Figure 1 A structural schematic diagram of a suction catheter provided by some embodiments of the present application;

[0019] Figure 2 A sectional view of the suction catheter of Figure 1

[0020] Figure 3 A sectional view of the tightening member in Figure 2

[0021] Figure 4 Another structural schematic diagram of a suction catheter provided by some embodiments of the present application;

[0022] Figure 5 A sectional view of the suction catheter of Figure 4

[0023] Figure 6 A sectional view of the tightening member in Figure 5

[0024] Figure 7 A sectional schematic diagram of a suction tube of a suction catheter of some embodiments of the present application;

[0025] Figure 8 An end surface structural schematic diagram of the suction tube in Figure 2 Figure 5 Figure 7 An end surface structural schematic diagram of the suction tube in

[0026] Figure 9 An end surface structural schematic diagram of the suction tube in Figure 2 Figure 5 Figure 7 An end surface structural schematic diagram of the suction tube in

[0027] Explanation of reference signs:

[0028] 100, suction tube; 101, suction inlet; 102, suction outlet; 103, tube cavity; 110, filter member; 200, tightening member; 201, tightening body; 202, tightening channel; 203, tightening portion; 204, connecting portion; 210, first end; 213, claw portion; 220, second end; 230, inner wall; A, included angle; L, axis; X, axial direction; Y, radial direction;

[0029] 300, power assembly; 302, impeller mechanism; 301, outflow window. DETAILED DESCRIPTION ​​​​​​​​

[0030] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "include" and "have" and any variations thereof used in the specification and claims of the present application and the above description of drawings are intended to cover the non-exclusive inclusion.

[0032] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0033] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0034] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0035] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0036] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse"

[0037] "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right"

[0038] "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise"

[0039] The orientation or positional relationship indicated by "axial X", "radial Y", "circumferential", and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0040] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connecting", "fixing", and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] The current thrombus aspiration treatment scheme mainly uses aspiration catheter to restore or improve the hemodynamic function of the patient. There are many ways to generate negative pressure by aspiration catheter, mainly divided into needle cylinder negative pressure aspiration, impeller negative pressure aspiration, or local negative pressure generated by fluid according to Bernoulli equation, etc. Among them, for the way of generating local negative pressure by fluid, blood cells are damaged during treatment, there is a risk of hemolysis, and the patient may have hematuria.

[0042] Through the treatment mode of needle cylinder aspiration and extracorporeal negative pressure pump aspiration, the thrombus is shaped and moved from the distal end to the proximal end of the aspiration catheter under the action of negative pressure, and there will be some residual thrombus in the path from the distal end to the proximal end. Therefore, when the aspiration catheter is withdrawn from the body, a certain negative pressure ability is needed to be slightly maintained outside the body to prevent the thrombus in the tube from falling off during the withdrawal of the catheter. When the thrombus moves from the distal end to the proximal end, if the negative pressure control is not accurate (such as the local pressure is too high), it may cause the thrombus to break and form microembolus to be scattered to other parts with blood flow.

[0043] In view of this, the present application provides an aspiration catheter which is connected with a tightening member through an aspiration tube, and the tightening body of the tightening member is protrudingly arranged, so as to realize clamping when the thrombus is sucked and limiting when the aspiration catheter is withdrawn, improve the thrombus anti-falling effect in the aspiration catheter, and thus improve the safety.

[0044] Figure 1 A structural schematic view of an aspiration catheter provided for some embodiments of the present application is shown in the figure; Figure 2 The aspiration catheter is Figure 1 A sectional view of the aspiration catheter.

[0045] As Figure 1 And Figure 2As shown, some embodiments of the present application provide an aspiration catheter, comprising an aspiration tube 100, a filter 110 and a tightening member 200, the aspiration tube 100 comprises an aspiration inlet 101, a lumen 103 and an aspiration outlet 102 which are arranged in sequence along an axial direction X of the aspiration catheter; the filter 110 is arranged in the lumen 103; the tightening member 200 is connected to the aspiration tube 100 and arranged on a side of the filter 110 which is away from the aspiration outlet 102, the tightening member 200 comprises a tightening body 201 and a tightening channel 202 which is formed by the tightening body 201 and protrudes inwardly relative to the axial direction X of the aspiration tube 100 along a radial direction Y of the aspiration catheter, and the tightening channel 202 is in communication with the lumen 103.

[0046] It can be understood that the aspiration tube 100 is arranged to extend along the axial direction X. The aspiration tube 100 is flexible, and can follow the shape of a blood vessel when the aspiration catheter is inserted into the blood vessel.

[0047] The aspiration tube 100 comprises the aspiration inlet 101, the lumen 103 and the aspiration outlet 102. During the thrombus aspiration process, thrombus and blood enter the lumen 103 from the aspiration inlet 101, the thrombus is retained in the lumen 103 by the filter 110, and the blood flows out of the aspiration outlet 102 and back to the body by passing through the filter 110.

[0048] Exemplarily, the aspiration tube 100 can have one aspiration inlet 101 or multiple aspiration inlets 101. The aspiration tube 100 can have one aspiration outlet 102 or multiple aspiration outlets 102.

[0049] Exemplarily, the lumen 103 can have one section or multiple sections arranged in sequence. In one example, the multiple sections of the lumen 103 can have the same or different hardness corresponding to the multiple sections of the aspiration tube 100. For example, the hardness of the multiple sections of the aspiration tube 100 can increase continuously from the aspiration inlet 101 to the aspiration outlet 102.

[0050] Exemplarily, the material of the aspiration tube 100 can include polyether block amide (PEBAX), thermoplastic polyurethane elastomer (TPU), nylon, etc.

[0051] Exemplarily, the aspiration catheter has a distal end and a proximal end which are opposite along the axial direction X. The distal end can be the end away from the operator, and the proximal end can be the end close to the operator. In one example, the aspiration inlet 101 of the aspiration tube 100 is located at the distal end, and the aspiration outlet 102 of the aspiration tube 100 is located at the proximal end.

[0052] In the present application, the aspiration catheter further comprises the filter 110 which is arranged in the lumen 103 to separate the thrombus and the blood, and retain the thrombus in the lumen 103.

[0053] Exemplarily, the filter 110 can be a mesh filter, a cage filter, an umbrella filter, a flat filter, etc. The filter 110 can be connected to the suction tube 100 by integration, buckling, a luer joint, etc.

[0054] Exemplarily, the filter 110 includes an inner buckle, an outer buckle and a filter screen, the inner buckle is connected with the filter screen, the outer buckle is connected with the suction tube 100 and the filter screen, the inner buckle is buckled with the outer buckle, and the filter screen can be easily replaced. It can be understood that the above connection modes are only part of examples, and other forms of implementation are also within the protection scope of the present application, and the present application does not make a detailed description here.

[0055] In the present application, the suction catheter further includes a tightening member 200, which is used to capture the thrombus entering the lumen 103 locally and limit the free thrombus in the lumen 103.

[0056] In some embodiments of the present application, the tightening member 200 can be connected outside the suction tube 100 or at least partially connected inside the suction tube 100. Exemplarily, at least part of the tightening member 200 is placed in the lumen 103. In one example, the tightening member 200 is completely placed in the lumen 103, or part of the tightening member 200 is placed in the lumen 103 and part of the tightening member 200 is placed outside the lumen 103.

[0057] In some embodiments of the present application, the tightening member 200 has a certain rigidity, exemplarily, the rigidity of the tightening member 200 is greater than the rigidity of the suction tube 100. In some examples, the material of the tightening member 200 can be metal material, nylon, polyethylene terephthalate (PET), polycarbonate (PC), etc. In other examples, a modified coating can be added to the inner wall of the tightening member 200 to improve the smoothness of the inner wall of the tightening member 200, so as to facilitate the smooth passage of the thrombus.

[0058] In some embodiments of the present application, the tightening member 200 includes a tightening body 201 and a tightening channel 202, at least part of the tightening body 201 protrudes inwardly relative to the axis of the suction tube 100 along the radial direction Y. The tightening channel 202 penetrates the tightening body 201 along the axial direction X and communicates with the lumen 103. At least part of the radial Y dimension of the tightening channel 202 is smaller than the radial Y dimension of the lumen 103.

[0059] Exemplarily, the tightening body 201 is entirely arranged to protrude inwardly, or part of the tightening body 201 protrudes inwardly and part of the tightening body 201 is embedded with the suction tube 100, or part of the tightening body 201 protrudes inwardly and part of the tightening body 201 is recessed outwardly.

[0060] As an example, the thrombus enters into the suction inlet 101, passes through the tightening member 200 into the lumen 103, is filtered out by the filter 110, and is discharged into the body from the suction outlet 102. When the thrombus partially enters the tightening channel 202, the tightening body 201 captures the thrombus and has a certain gripping force on the thrombus, preventing the thrombus from falling out of the suction catheter; when the suction catheter has no suction force, when the thrombus moves to the tightening channel 202, due to the smaller size of the at least partial inner diameter of the tightening channel 202, the tightening body 201 has a limiting resistance to the thrombus, thereby preventing the thrombus from escaping.

[0061] By arranging the tightening member 200 on the side of the suction pipe 100 away from the filter 110, the tightening body 201 of the tightening member 200 is protrudingly arranged, so that during the suction of the thrombus into the lumen 103, the thrombus has a tightening effect, reducing the risk of thrombus falling off, and during the withdrawal of the suction catheter or the disappearance of the negative pressure, the tightening body 201 has a limiting anti-escape effect on the thrombus, reducing the suction resistance of the suction catheter and improving the anti-falling effect of the suction catheter.

[0062] In some embodiments of the present application, the tightening body 201 includes a first end 210 and a second end 220, and the tightening channel 202 has a tapering trend in a first direction, and the first end 210 is arranged between the second end 220 and the filter 110, wherein the first direction extends from the first end 210 to the second end 220.

[0063] The first end 210 and the second end 220 of the tightening body 201 are oppositely arranged along the axial direction X, and the tightening channel 202 forms an opening through the first end 210 and the second end 220. That is, the first direction is the extension direction from the proximal end to the distal end, and the tightening channel 202 has a tapering trend from the proximal end to the distal end.

[0064] The tapering trend of the tightening channel 202 makes the tightening body 201 have a continuously inward protruding trend relative to the axis of the suction pipe 100. Wherein the inner diameter size of the first end 210 is smaller than the inner diameter size of the second end 220.

[0065] The tapering of the tightening channel 202 realizes the continuously protruding arrangement of the tightening body 201 relative to the axis of the suction pipe 100, which reduces the resistance, thereby reducing the wear of the inner wall of the tightening body, and makes the blood flow more stable, and at the same time, it is more conducive to the thrombus entering the suction catheter.

[0066] In some embodiments of the present application, the tightening member 200 is arranged at the suction inlet 101, and along the axial direction X of the tightening channel 202, the second end 220 is located on the side of the suction inlet 101 away from the filter 110, and the outer diameter of the tightening body 201 has a tapering trend in the first direction.

[0067] The tightening member 200 is arranged at the suction port 101, so that the thrombus passes through the tightening channel 202 and enters the lumen 103.

[0068] In some embodiments of the present application, the tapering trend of the outer diameter of the tightening body 201 is such that the wall thickness of the tightening body 201 from the first end 210 to the second end 220 can be equal or tapering.

[0069] In the present application, the arrangement of the tightening member 200 at the suction port 101 can reduce the influence on the length of the filter 110, and the second end 220 is located at the side of the suction port 101 away from the filter 110, so that at least part of the tightening channel 202 is arranged outside the lumen 103. By tapering the tightening body 201 from close to the filter 110 to far away from the filter 110, the damage to the blood vessel caused by the suction catheter during the process of entering the blood vessel is reduced.

[0070] In other embodiments of the present application, the tightening channel 202 has a tapering trend in the first direction, and the outer diameter of the tightening body 201 has a tapering trend, or the outer diameter of the tightening body 201 has no tapering trend, i.e. the outer wall of the tightening body 201 is equidistantly arranged relative to the axis of the tightening channel.

[0071] Figure 3 For Figure 2 the cross-sectional view of the tightening member 200.

[0072] As Figures 1 to 3 shown, in some embodiments of the present application, the tightening body 201 includes a connecting portion 204 and a tightening portion 203 arranged successively along the axial direction X of the tightening channel 202, the connecting portion 204 is arranged between the tightening portion 203 and the filter 110, and the connecting portion 204 is connected to the suction tube 100; the tightening body 201 includes a first end 210 and a second end 220, and the outer diameter of the tightening portion 203 has a tapering trend from the first end 210 to the second end 220, and the first end 210 is connected to the connecting portion 204.

[0073] Exemplarily, the connecting portion 204 is arranged straight along the axial direction X, and at least part of the connecting portion 204 is arranged in a stacked manner with the suction tube 100.

[0074] Exemplarily, the connecting portion 204 can be arranged inside or outside the lumen 103.

[0075] In one example, the connecting portion 204 is arranged inside the lumen 103 and overlaps with the suction tube 100; or, part of the connecting portion 204 is arranged inside the lumen 103 and overlaps with the suction tube 100, and the other part is arranged outside the suction tube 100 and suspended.

[0076] In another example, the connecting part 204 is placed inside the lumen 103, and the tightening part 203 is suspended outside the suction tube 100. The first end 210 of the tightening part 203 is flush with the suction port 101, that is, the end face of the tightening part 203 is flush with the suction port 101.

[0077] In some examples, the connecting part 204 can be connected to the tightening part 203 by means of bonding, snapping, or other methods, or the tightening body 201 can be integrally formed.

[0078] For example, along the axial direction X, the length of the connecting portion 204 may be less than the length of the tightening portion 203, or greater than or equal to the length of the tightening portion 203.

[0079] For example, the side of the connecting portion 204 facing away from the tightening portion 203 abuts against the filter element 110. This ensures that the filter element 110 has sufficient arrangement space, guarantees the effective working length of the filter element 110, and thus guarantees the filtration effect.

[0080] The tightening part 203 is connected to the suction tube 100 via the connecting part 204, which improves the connection reliability of the tightening part 203 and facilitates the setting of the tightening part 203 extending out of the suction port 101.

[0081] In some embodiments of this application, the connecting portion 204 is placed within the lumen 103. This reduces the maximum radial Y dimension of the aspiration catheter, facilitating its entry into the blood vessel.

[0082] Figure 4 Another schematic diagram of the aspiration catheter provided in some embodiments of this application; Figure 5 for Figure 4 A cross-sectional view of the suction catheter.

[0083] like Figure 4 and Figure 5 As shown, in some other embodiments of this application, the tightening body 201 includes a first end 210 and a second end 220. Along a first direction, the tightening channel 202 has a gradually expanding trend, wherein the first direction extends from the first end 210 to the second end 220. The periphery of the tightening body 201 is connected to the suction tube 100. Along the axial direction X of the tightening channel 202, the first end 210 is located between the second end 220 and the filter element 110.

[0084] The first end 210 and the second end 220 of the tightening body 201 are arranged opposite each other along the axial direction X, and the tightening channel 202 passes through the first end 210 and the second end 220 to form an opening.

[0085] The tightening body 201 can be placed entirely inside the cavity 103, or partly inside the cavity 103 and partly suspended outside the cavity 103.

[0086] The constricting channel 202 has a diverging trend, that is, the constricting channel 202 has a diverging trend from the suction outlet 102 to the suction inlet 101. The inner diameter of the first end 210 is smaller than the inner diameter of the second end 220. That is, the constricting channel 202 has a diverging trend from the proximal end to the distal end.

[0087] Exemplarily, the outer diameter of the constricting body 201 can have a diverging trend or a converging trend or extend straight along the first direction.

[0088] By setting the constricting channel 202 of the constricting body 201 to diverge from the side close to the filter 110 to the side away from the filter 110, the side of the constricting channel 202 of the constricting body 201 close to the filter 110 is convex inward relative to the suction tube axis, which not only has the effect of preventing the thrombus in the lumen 103 from escaping, but also guides the thrombus entering the lumen 103 by the diverging trend of the inner wall of the constricting body 201, facilitating the suction of the thrombus.

[0089] Figure 6 For Figure 5 A sectional view of the constricting member 200.

[0090] As Figures 4 to 6 shown, in one specific embodiment of the present application, the constricting body 201 includes a connecting portion 204 and a constricting portion 203 distributed along the axial direction X of the constricting channel 202 in sequence, the constricting portion 203 is arranged between the connecting portion 204 and the filter 110, the connecting portion 204 is arranged in the lumen 103 and overlaps with the suction tube 100; the constricting portion 203 includes a first end 210 and a second end 220, and the inner diameter of the constricting portion 203 has a diverging trend along the first direction, the second end 220 is connected with the connecting portion 204, and the side of the connecting portion 204 away from the second end 220 is arranged flush with the suction inlet 101 along the axial direction X.

[0091] Exemplarily, the connecting portion 204 is arranged straight along the axial direction X and overlaps with the suction tube 100.

[0092] In some examples, the connecting portion 204 can be connected with the constricting portion 203 by bonding, clamping or the like, or the constricting body 201 is integrally formed.

[0093] Exemplarily, along the axial direction X, the length of the connecting portion 204 can be smaller than the length of the constricting portion 203 or greater than or equal to the length of the constricting portion 203.

[0094] For example, the side of the constricting portion 203 away from the connecting portion 204 abuts against the filter 110. So that the filter 110 has enough arrangement space, ensuring the effective working length of the filter 110, and further ensuring the filtering effect. Exemplarily, the first end 210 is completely aligned with the suction inlet 101 along the axial direction X, both of which are in the same plane or height, without protrusion or depression.

[0095] By gradually expanding from the tightening portion 203, the connection portion 204 is firmly connected with the suction pipe 100, and the first end 210 of the tightening body 201 is flush with the suction inlet 101, which reduces the impact on the length of the filter 110 and reserves sufficient space for the arrangement of the filter 110.

[0096] In another embodiment of the present application, along the axial direction X of the tightening channel 202, the tightening member 200 is located between the suction inlet 101 and the filter 110, and the first end 210 has a spacing from the suction inlet 101. The tightening member 200 is arranged between the suction inlet 101 and the filter 110, which can provide support force for the suction pipe 100.

[0097] As shown in Figures 1 to 6 In some embodiments of the present application, the included angle A between the inner wall 230 of the tightening body 201 and the axis L of the tightening channel 202 ranges from 1 degree to 10 degrees.

[0098] Exemplarily, the inner wall 230 of the tightening body 201 encloses the tightening channel 202. In one example, the inner wall 230 is formed between the first end 210 and the second end 220, forming a gradually changing trend of the tightening channel 202.

[0099] In some examples, the inner wall 230 forms a gradually tapering or expanding trend of the tightening channel 202.

[0100] As an example, the included angle A between the inner wall 230 and the axis L can range from 2 degrees to 8 degrees, for example, the included angle A between the inner wall 230 and the axis L is 2 degrees, 5 degrees, 6 degrees, or 8 degrees.

[0101] The angle range of the inner wall 230 between 1 degree and 10 degrees is beneficial for the suction of thrombus, controls the suction resistance, and reduces the loss of suction pressure.

[0102] Further, in some technical solutions, the suction pipe 100 is not provided with the tightening member 200, and under the rated speed, the pressure difference between the suction inlet 101 and the suction outlet 102 of the suction conduit is tested, and the pressure difference is about 50 Kpa. In the present application, the pressure difference between the suction inlet 101 and the suction outlet 102 of the suction conduit formed by installing the tightening member 200 with the included angle A between the inner wall 230 and the axis L of 5 degrees to the suction pipe 100 is tested, and the pressure difference generated by the gradually tapering and gradually expanding structures of the tightening channel 202 is similar to the pressure difference without the tightening member 200, and the maximum difference is only 0.03%.

[0103] In the related art, a one-way valve is arranged in the lumen of the suction tube, and the one-way valve is arranged between the suction port and the filter, which is used to prevent the thrombus from escaping into the lumen, but increases the resistance of the thrombus entering the lumen. Therefore, the arrangement of the tightening member 200 of the present application reduces the influence of the pressure difference and flow generated by the suction catheter compared with the one-way valve structure, and also has an anti-escape effect on the thrombus.

[0104] In one embodiment, the length of the tightening member 200 along the axial direction of the tightening channel 202 is less than 1 / 20 of the length of the suction tube 100, so that the shorter the tightening member 200 is, the longer the effective length of the filter 110 is. As an example, the length of the tightening member 200 is 1mm-20mm.

[0105] Figure 7 A cross-sectional view of a suction tube 100 of a suction catheter according to some embodiments of the present application.

[0106] As shown in FIG. 1, in one embodiment, the tightening body 201 is arranged in the lumen 103, and the tightening body 201 protrudes from the suction tube 100 along the axial direction X. Figure 7 As shown in FIG. 1, in one embodiment, the tightening body 201 is arranged in the lumen 103, and the tightening body 201 protrudes from the suction tube 100 along the axial direction X.

[0107] As shown in FIG. 1, in one embodiment, the tightening body 201 is arranged in the lumen 103, and the tightening body 201 protrudes from the suction tube 100 along the axial direction X.

[0108] Figure 8 As shown in FIG. 1, in one embodiment, the tightening body 201 is arranged in the lumen 103, and the tightening body 201 protrudes from the suction tube 100 along the axial direction X. Figure 2 Figure 5 As shown in FIG. 1, in one embodiment, the tightening body 201 is arranged in the lumen 103, and the tightening body 201 protrudes from the suction tube 100 along the axial direction X. Figure 7 As shown in FIG. 1, in one embodiment, the tightening body 201 is arranged in the lumen 103, and the tightening body 201 protrudes from the suction tube 100 along the axial direction X.

[0109] Figure 8 As shown in FIG. 1, in one embodiment, the tightening body 201 is arranged in the lumen 103, and the tightening body 201 protrudes from the suction tube 100 along the axial direction X.

[0110] As shown in FIG. 1, in one embodiment, the tightening body 201 is arranged in the lumen 103, and the tightening body 201 protrudes from the suction tube 100 along the axial direction X.

[0111] As shown in FIG. 1, in one embodiment, the tightening body 201 is arranged in the lumen 103, and the tightening body 201 protrudes from the suction tube 100 along the axial direction X.

[0112] As shown in FIG. 1, in one embodiment, the tightening body 201 is arranged in the lumen 103, and the tightening body 201 protrudes from the suction tube 100 along the axial direction X.

[0113] As shown in FIG. 1, in one embodiment, the tightening body 201 is arranged in the lumen 103, and the tightening body 201 protrudes from the suction tube 100 along the axial direction X.

[0114] ​​The plurality of claw portions 213 are connected to the suction pipe 100 through the connecting portion 204, improving the connection firmness of the tightening body 201.

[0115] The suction resistance of the suction catheter is reduced through the spacing between adjacent claw portions 213, improving the suction efficiency of the thrombus, and the blood flow is increased through the spacing between the claw portions 213, reducing the risk of thrombus blocking the lumen 103.

[0116] Figure 9 For Figure 2 or Figure 5 or Figure 7 An end surface structure diagram of the suction pipe 100.

[0117] As Figure 2 , Figure 5 , Figure 7 and Figure 9 In some embodiments of the present application, the tightening body 201 is continuously arranged along the circumference of the tightening channel 202.

[0118] Exemplarily, along the circumference, the tightening body 201 is in a closed structure or has an opening. That is, the tightening body 201 can be an open ring or a closed ring.

[0119] In one example, the connecting portion 204 and the tightening portion 203 of the tightening body 201 are continuously arranged along the axial direction X.

[0120] The continuous arrangement of the tightening body 201 improves the overall strength of the tightening body 201, reduces the risk of extrusion deformation of the thrombus on the tightening portion 203, and improves the service life and reliability.

[0121] In some embodiments of the present application, the tightening body 201 is in a closed ring shape. Reducing manufacturing difficulty and manufacturing cost.

[0122] In some embodiments of the present application, the material of the tightening body 201 includes a metal material.

[0123] Exemplarily, the metal material can include platinum-iridium alloy, platinum alloy, stainless steel, nickel-titanium alloy, etc.

[0124] Has sufficient structural strength to avoid deformation, reduces wear of the tightening member 200 after long-term use, and improves service life.

[0125] In some embodiments of the present application, the tightening body 201 and the suction pipe 100 are laminated and bonded along the radial direction Y of the suction pipe 100.

[0126] Exemplarily, the bonding can be achieved by using adhesive, resin, etc.

[0127] As an example, the adhesive can be epoxy resin, polyurethane adhesive, hot melt adhesive, etc.

[0128] In the present application, the adhesion is conducive to reducing the influence on the diameter of the suction pipe 100 and facilitating the connection with the suction pipe 100.

[0129] As shown in the drawings, in some embodiments of the present application, the suction catheter further comprises a power assembly 300 installed on the suction outlet 102, the power assembly 300 comprising an impeller mechanism 302 and an outflow window 301, the outflow window 301 being opened on the impeller mechanism 302 and communicating with the suction pipe 100. Figures 1 to 5

[0130] Exemplarily, the impeller mechanism 302 is driven by a high-speed rotation of a micro motor, and the impeller mechanism 302 usually adopts a centrifugal or axial flow structure. Among them, the centrifugal impeller can centrifugally separate the thrombus fragments, reducing the risk of blockage.

[0131] In one example, the outflow window 301 is arranged in a spiral or radial shape, matching the rotation direction of the impeller mechanism, for guiding the blood to be discharged at high speed.

[0132] The embodiments of the present application also provide a suction system comprising the suction catheter of the above-mentioned embodiments.

[0133] Exemplarily, the suction system further comprises a delivery sheath, and the suction catheter passes through the delivery sheath to reach the designated position. In the process of the suction catheter sucking the thrombus, the outflow window is exposed outside the delivery sheath.

[0134] The above is merely a specific implementation of the present application, and those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-mentioned system, module and unit can refer to the corresponding process in the foregoing method embodiments, which will not be described here. It should be understood that the protection scope of the present application is not limited to this, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed in the present application, and these modifications or replacements should be covered within the protection scope of the present application.​

Claims

1. A suction catheter, characterized in that, include: A suction tube includes an inlet, a lumen, and an outlet that are sequentially distributed along its own axial direction; A filter element is disposed within the cavity; A tightening member is connected to the suction tube and located on the side of the filter element facing away from the suction outlet. The tightening member includes a tightening body, which protrudes inward along the radial direction of the suction tube relative to the axis of the suction tube to form a tightening channel, which communicates with the lumen.

2. The aspiration catheter according to claim 1, characterized in that, The tightening body includes a first end and a second end. Along a first direction, the tightening channel has a tapering trend, and the first end is disposed between the second end and the filter element, wherein the first direction extends from the first end to the second end.

3. The aspiration catheter according to claim 2, characterized in that, The tightening member is disposed at the inlet along the axial direction of the tightening channel, with the second end located on the side of the inlet facing away from the filter element, and the outer diameter of the tightening body gradually decreasing along the first direction.

4. The aspiration catheter according to claim 3, characterized in that, The tightening body includes a connecting part and a tightening part that are successively distributed along the axial direction of the tightening channel. The connecting part is placed between the tightening part and the filter element, and the connecting part is connected to the suction tube. The tightening portion includes a first end and a second end. Along the first direction, the outer diameter of the tightening portion has a gradually narrowing trend. The first end is connected to the connecting portion.

5. The aspiration catheter according to claim 4, characterized in that, The connecting part is placed inside the cavity.

6. The aspiration catheter according to claim 1, characterized in that, The tightening body includes a first end and a second end. Along a first direction, the tightening channel has a gradually expanding trend, wherein the first direction extends from the first end to the second end. The periphery 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.

7. The aspiration catheter according to claim 6, characterized in that, The tightening body includes a connecting part and a tightening part that are successively distributed along the axial direction of the tightening channel. The tightening part is placed between the connecting part and the filter element. The connecting part is placed inside the cavity and overlaps with the suction tube. The tightening part includes a first end and a second end. Along the first direction, the inner diameter of the tightening part has a gradually expanding trend. The second end is connected to the connecting part, and the side of the connecting part facing away from the second end is flush with the suction port along the axial direction.

8. The aspiration catheter according to any one of claims 1 to 7, characterized in that, The angle between the inner wall of the tightening body and the axis of the tightening channel is between 1 degree and 10 degrees.

9. The aspiration catheter according to claim 1, characterized in that, The tightening body includes a connecting part and a tightening part, the connecting part being at least partially placed inside the cavity, and the connecting part connecting the suction tube and the tightening part; The tightening portion includes a plurality of claws that protrude inward relative to the connecting portion along the radial direction of the tightening channel, and the plurality of claws are distributed at intervals along the circumference of the connecting portion.

10. The aspiration catheter according to claim 1, characterized in that, The tightening body is continuously arranged along the circumference of the tightening channel.

11. The aspiration catheter according to claim 1, characterized in that, The material of the tightening body includes metal.

12. A suction system, characterized in that, Includes the suction catheter according to any one of claims 1 to 11.

Images