CN112169142A

CN112169142A - Suction catheter

Info

Publication number: CN112169142A
Application number: CN201911304918.4A
Authority: CN
Inventors: 王平; 肖建平; 董壮
Original assignee: Shenzhen Neich Enterprise Co ltd
Current assignee: Shenzhen Neich Enterprise Co ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2021-01-05

Abstract

The invention provides a suction catheter, comprising a suction member and a balloon member, wherein the suction member is provided with a suction cavity; the balloon component is sleeved on the suction component, the inner wall of the balloon component and the outer wall of the suction component are jointly surrounded to form a balloon cavity, the outer wall of the balloon component is provided with at least one circulation groove extending along the extension direction of the suction component, the balloon component has a contraction state when the balloon cavity is not filled with fluid and an expansion state after the fluid is filled into the balloon cavity through the filling opening, the groove walls of the circulation grooves are circumferentially distributed at intervals along the outer wall of the balloon component, and the circulation grooves are kept penetrating from the far end to the near end when the balloon component is in the expansion state. This suction catheter makes when the sacculus component is in the inflation state and its outer wall laminating when the vascular wall through seting up the circulation groove at the outer wall of sacculus component, and blood can continue to flow through the circulation groove that the distance runs through, prevents the condition that the vascular blockage from appearing, guarantees the normal blood supply of myocardium, has reduced the operation risk.

Description

Suction catheter

Technical Field

The invention belongs to the technical field of medical instruments, and particularly relates to an aspiration catheter.

Background

Coronary atherosclerotic heart disease has become the first killer threatening health and life. Rupture of unstable atherosclerotic plaque in coronary arteries can lead to acute thrombosis, occlusion of the coronary artery lumen, interruption of blood flow, and ischemia or necrosis of myocardial cells in the corresponding blood supply area. The key of treating patients with Acute Coronary Syndrome (ACS) is to open relevant infarcted blood vessels rapidly and recover the blood supply of myocardial cells so as to reduce the myocardial infarction area, reduce the risk of complications and prevent sequelae which may appear in the near term and the long term.

Currently, the thrombus is usually aspirated using an aspiration catheter, which is sent to the thrombus site and then withdrawn from the proximal end of the thrombus by negative pressure to reestablish the blood flow dynamics.

However, in the existing suction catheter, when the proximal end of the thrombus is not blocked, the blood flow is large, and the suction catheter sucks a large amount of blood, so that the amount of the thrombus to be sucked is reduced, and the suction effect is influenced; when the proximal end of the thrombus is blocked and the distal end of the thrombus does not have blood flow, normal blood supply of cardiac muscle cannot be ensured, the operation time can be prolonged, and the operation risk is increased.

Disclosure of Invention

The invention aims to provide an aspiration catheter, and aims to solve the technical problems that in the prior art, when the proximal end of a blood vessel is not blocked, the effect of aspirating thrombus is poor, and when the proximal end of the blood vessel is blocked, myocardial blood supply is influenced.

The present invention is achieved by an aspiration catheter comprising:

an aspiration member having an aspiration lumen, an aspiration port communicating to a proximal end of the aspiration lumen for connecting an external device to cause the aspiration lumen to generate negative pressure, an aspiration port communicating to a distal end of the aspiration lumen for aspirating thrombus by the negative pressure of the aspiration lumen;

the balloon component is sleeved on the suction component, the inner wall of the balloon component and the outer wall of the suction component are jointly encircled to form a balloon cavity, the balloon component is provided with an injection port communicated with the balloon cavity, the outer wall of the balloon component is provided with at least one circulation groove extending along the extension direction of the suction component, the balloon component has a contraction state when the balloon cavity is not filled with fluid and an expansion state after the fluid is filled into the balloon cavity through the injection port, the groove walls of the circulation grooves are circumferentially distributed at intervals along the outer wall of the balloon component, and the circulation grooves are kept penetrating from the far end to the near end when the balloon component is in the expansion state.

Furthermore, the balloon component is provided with a plurality of circulation grooves which are arranged at intervals along the circumferential direction of the balloon component and extend in parallel.

Further, the bottom of the circulation groove is an outer wall surface of the suction member.

Further, the balloon member has a cross-section in the shape of a petal.

Furthermore, an avoiding groove is formed in the outer wall surface of the suction component, the balloon component covers the notch of the avoiding groove, and the groove wall of the avoiding groove and the inner wall of the balloon component jointly enclose to form the balloon cavity.

Further, the suction member further comprises a guide cavity which is isolated from the suction cavity and used for passing a guide wire and a penetration opening communicated to the proximal end of the guide cavity and used for the guide wire to penetrate through the guide cavity, the guide cavity and the suction cavity are arranged in an overlapping mode in the extension direction of the suction member and are arranged in a staggered mode in the direction perpendicular to the extension direction of the suction member.

Further, the suction member comprises a tubular suction part and a tubular guide part which is connected to the far end of the suction part and has an outer diameter smaller than that of the suction part, the suction cavity is arranged in the suction part, the guide cavity is arranged in the guide part, a step structure is formed at the connection part of the suction part and the guide part, the step structure is provided with a chamfer, and the suction opening is opened in the chamfer.

Further, the suction member further has a communication chamber provided separately from the suction chamber and an inlet port communicating with a proximal end of the communication chamber and used for introducing a fluid into the communication chamber, a distal end of the communication chamber communicates with the injection port, and the suction catheter further includes a pressurizer connected to the suction member and communicating with the inlet port, the pressurizer being used for quantitatively injecting the fluid into the communication chamber through the inlet port so that the balloon member is switched from the deflated state to the inflated state.

Further, the aspiration catheter further comprises a marker ring coupled to the aspiration member.

Further, the softness of the suction member tapers from the distal end to the proximal end.

Compared with the prior art, the invention has the technical effects that: the suction catheter is provided with the balloon component sleeved on the suction component, when the balloon component is in a contraction state, the outer diameter of the suction catheter is smaller and can extend into a blood vessel, when fluid is injected into the balloon cavity to enable the balloon component to be in an expansion state, the expanded balloon cavity increases the whole outer diameter of the suction catheter, the effect of delaying blood flow and blood flow speed is achieved, the phenomenon that when negative pressure is generated in the suction cavity, the suction amount of thrombus is reduced due to the fact that a large amount of blood is sucked in the suction cavity is prevented, the suction efficiency of the thrombus is improved, the suction catheter enables the blood to continue to flow through the through-flow grooves which are penetrated far and near when the balloon component is in the expansion state and the outer wall of the balloon component is attached to the blood vessel wall through the through-flow grooves which are penetrated far and near is prevented from being blocked, normal blood supply of cardiac muscle is.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a cross-sectional view of a balloon catheter provided in accordance with an embodiment of the present invention, wherein the balloon lumen has a lumen;

fig. 2 is a cross-sectional view of a balloon catheter provided in an embodiment of the present invention, in which a balloon member is not attached to an inner wall of a blood vessel and is provided with a flow channel, and a balloon cavity has a cavity;

fig. 3 is a cross-sectional view of a balloon catheter according to an embodiment of the present invention, in which a balloon member is attached to an inner wall of a blood vessel and has four flow channels, and a balloon cavity has a cavity;

FIG. 4 is a cross-sectional view of a balloon catheter provided in accordance with an embodiment of the present invention, wherein the balloon lumen has two lumens;

fig. 5 is a cross-sectional view of fig. 4.

Description of reference numerals:

10. a suction member; 11. a suction section; 111. a suction lumen; 112. a suction port; 113. a withdrawal port; 114. a position avoiding groove; 115. a communicating cavity; 116. a communication port; 117. an inlet; 12. a guide section; 121. a guide chamber; 122. a penetration opening; 13. a communicating portion; 20. a balloon member; 201. a balloon cavity; 202. an injection port; 21. a circulation tank; 30. a pressurizer; 41. a suction seat; 42. a communication base; 50. a blood vessel; 60. marking ring

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.

Referring to fig. 1, the aspiration catheter of the present embodiment includes an aspiration member 10, a balloon member 20, a pressurizer 30, and a marker ring 60. The suction catheter is proximal to the operating end and distal to the operating end along the extension direction thereof.

Referring to fig. 1 and 4, the suction member 10 has a suction lumen 111, a suction port 113 connected to a proximal end of the suction lumen 111, and a suction port 112 connected to a distal end of the suction lumen 111, the suction port 113 is used for connecting an external device to generate a negative pressure in the suction lumen 111, and the suction port 112 is used for sucking thrombus by the negative pressure in the suction lumen 111. The suction member 10 is preferably tubular to extend into the blood vessel 50. The external device is an aspirator for generating negative pressure in the aspiration lumen 111, and when the aspirator performs aspiration operation, the aspiration port 112 can be reciprocated between the proximal end and the distal end of the lesion by operating the aspiration member 10 to ensure that thrombus in the lesion is aspirated cleanly, thereby achieving therapeutic effect. Wherein the suction member 10 is provided at its suction port 113 with a suction seat 41 for fitting with a suction device. The withdrawal port 113 can also be connected to a drug delivery device which can deliver a drug into the suction lumen 111 such that the drug enters the blood vessel 50 through the withdrawal port 112 for therapeutic action.

Referring to fig. 1 and 4, the balloon member 20 is sleeved on the suction member 10, an inner wall of the balloon member 20 and an outer wall of the suction member 10 together enclose to form a balloon cavity 201, a distal end of the balloon member 20 is hermetically connected to the suction member 10, a proximal end of the balloon member is provided with an injection port 202 communicated with the balloon cavity 201, and an external expansion device can introduce or discharge fluid, which may be gas or liquid, into the balloon cavity 201 through the injection port 202, wherein the liquid may be physiological saline. Referring to fig. 2 and 3, the outer wall of the balloon member 20 is provided with at least one circulation groove 21 extending along the extending direction of the suction member 10, the balloon member 20 has a contracted state when the balloon cavity 201 is not filled with fluid and an expanded state after the balloon cavity 201 is filled with fluid, and when the balloon member 20 is in the expanded state, the circulation groove 21 is kept penetrating from the distal end to the proximal end when the balloon member 20 is in the expanded state. The groove walls of the circulation groove 21 are circumferentially distributed at intervals along the outer wall of the balloon member 20 so that a gap for blood circulation is left between the two groove walls of the circulation groove 21, and the cross section of the circulation groove 21 may be U-shaped, V-shaped, trapezoidal, or the like, including but not limited thereto.

Referring to fig. 3, the outer wall surface of the balloon member 20 can be attached to the inner wall of the blood vessel 50, and the suction member 10 can be fixed in position by the friction force between the balloon member 20 and the inner wall of the blood vessel 50 to prevent displacement in the blood vessel 50, so that the suction port 112 is aligned accurately and stably, and blood can continue to flow through the circulation groove 21. The outer wall surface of the balloon member 20 may be spaced from the inner wall of the blood vessel 50. referring to fig. 2, blood flows between the outer wall surface of the balloon member 20 and the inner wall of the blood vessel 50 and through the circulation grooves 21, and the circulation grooves 21 increase the amount of blood flow that can pass through. Preferably, the balloon member 20 is made of an elastic material, and the outer wall surface of the balloon member 20 is spaced from the inner wall surface of the blood vessel 50 in a state where the balloon member 20 is not elastically deformed, and the balloon member 20 is deformed and expanded after the balloon chamber 201 is pressurized, wherein the elastic deformation amount of the groove wall of the circulation groove 21 is smaller than the deformation amount of the outer wall surface of the balloon member 20, and the user can control the gap between the balloon member 20 and the inner wall surface of the blood vessel 50 by the pressurizer 30 capable of controlling the pressurization amount, thereby achieving the purpose of controlling the blood flow.

The suction catheter of the embodiment of the invention is provided with the balloon component 20 on the suction component 10, when the balloon component 20 is in a contraction state, the outer diameter of the suction catheter is smaller and can extend into the blood vessel 50, when fluid is injected into the balloon cavity 201 to enable the balloon component 20 to be in an expansion state, the expanded balloon cavity 201 increases the whole outer diameter of the suction catheter, the function of delaying the blood flow and the blood flow speed is achieved, when the suction cavity 111 generates negative pressure, the negative pressure in the suction cavity 111 is prevented from being reduced due to too fast blood flow speed, the suction force on thrombus is reduced, the phenomenon that the suction amount on the thrombus is reduced due to the fact that a large amount of blood is sucked can be avoided, and the suction efficiency on the thrombus is improved. The suction catheter has the advantages that the flow grooves 21 are formed in the outer wall of the balloon component 20, so that when the balloon component 20 is in an expansion state, blood can continuously flow or the blood flow can be increased through the flow grooves 21 which are penetrated far and near, the condition that the blood vessel 50 is blocked is prevented, the normal blood supply of cardiac muscle is ensured, and the operation risk is reduced.

Specifically, referring to fig. 3, the balloon member 20 is provided with a plurality of flow grooves 21, and the flow grooves 21 are disposed at intervals along the circumferential direction of the balloon member 20 and extend in parallel to each other. The plurality of flow grooves 21 not only increase the blood flow volume, but also equalize the blood flow volume in the circumferential direction of the balloon member 20, thereby preventing the suction catheter from being squeezed in a certain direction due to an excessive blood flow on one side, and avoiding the situation where the suction port 112 is away from the thrombus.

Alternatively, referring to fig. 2 and 3, the bottom of the circulation groove 21 is spaced from the outer wall of the suction member 10, i.e. the suction chamber 111 has only one chamber, so that the suction chamber 111 surrounds the whole suction member 10, the suction member 10 is evenly stressed in the circumferential direction, and the suction member 10 is located in the middle of the blood vessel 50. Preferably, the ratio of the groove bottom area of the flow-through groove 21 to the groove wall area should be as small as possible to reduce the degree of deformation of the groove bottom of the flow-through groove 21 towards the inner wall of the blood vessel 50. More preferably, the cross section of the balloon member 20 is preferably in the shape of a petal, i.e., the circulation grooves 21 are all approximately V-shaped, so as to prevent the groove bottom or wall of the circulation groove 21 from being elastically deformed to fit the inner wall of the blood vessel 50 in the case of over-pressurization of the balloon cavity 201, and ensure that the circulation groove 21 is always supplied with blood. In the embodiment of the present invention, the side wall of the circulation groove 21 and the outer wall of the balloon member 20 are rounded to eliminate the corner of the balloon member 20, so that the balloon member 20 is not easily broken at the corner, and the smooth wall not only reduces the friction force for blood flow to pass through, but also balances the overall expansion coefficient of the balloon member 20, and facilitates control. The two groove side walls of the circulation groove 21 are cambered surfaces and the arc bulges are opposite, the arrangement is convenient for processing and production, and the situation that the two groove side walls of the circulation groove 21 are attached to each other to block blood circulation due to the expansion of the saccule cavity 201 in the process of plane arrangement can be prevented.

In another embodiment, referring to fig. 5, the bottom of the circulation groove 21 is the outer wall surface of the suction member 10, that is, the balloon member 20 has a plurality of balloon membranes, which respectively form mutually isolated chambers with the outer wall surface of the suction member 10, that is, the balloon cavity 201 has a plurality of mutually isolated chambers, so that not only is the blood flow passing through the circulation groove 21 increased, but also the pressure in each chamber can be adjusted or the respective balloon membranes can be set to different expansion coefficients according to actual needs, so that the balloon member 20 obtains different expansion effects, thereby adapting to the complex diseased environment inside the blood vessel 50. Preferably, the balloon membranes are disposed adjacent to each other, and when the balloon member 20 is in the inflated state, the balloon membranes can abut against the inner wall surface of the blood vessel 50 to position the suction member 10, and the circulation groove 21 can ensure relatively unobstructed blood circulation.

Since the balloon member 20 has a certain thickness, when the suction member 10 passes through the blood vessel 50, the balloon member 20 in the contracted state enlarges the overall outer diameter of the balloon catheter, and when the suction member 10 passes through the thin blood vessel 50, the passage is difficult, please refer to fig. 1 and 4, in the embodiment of the present invention, the suction member 10 is provided with the avoiding groove 114 on the outer wall surface thereof, the balloon member 20 covers the notch of the avoiding groove 114, and the groove wall of the avoiding groove 114 and the inner wall of the balloon member 20 together enclose to form the balloon cavity 201. In this way, the balloon member 20 can be positioned within the clearance groove 114 without affecting the overall outer diameter of the balloon catheter when the balloon member 20 is in the deflated state.

Referring to fig. 1 and 4, further, the suction member 10 includes a tubular suction portion 11 and a guide portion 12 which is tubular and connected to a distal end of the suction portion 11, and has an outer diameter smaller than the outer diameter of the suction portion 11, the suction member 10 further includes a guide cavity 121 which is isolated from the suction cavity 111 and is used for passing a guide wire therethrough, and a penetration hole 122 which is communicated with a proximal end of the guide cavity 121 and is used for allowing the guide wire to penetrate through the guide cavity 121, the suction cavity 111 is disposed in the suction portion 11, the guide cavity 121 is disposed in the guide portion 12, and the guide portion 12 is disposed at a distal end of the suction cavity 111, wherein the guide cavity 121 and the suction cavity 111 are overlapped in an extending direction of the suction member 10 and are staggered in a direction perpendicular to the extending direction of the suction member 10, the penetration hole 122 is preferably disposed at a side wall of the guide portion 12. The conventional guiding lumen 121 is usually disposed at one side of the suction lumen 111 in the radial direction to facilitate the insertion of the guide wire and to move the suction member 10 in the blood vessel 50, but this will increase the outer diameter of the whole suction member 10, and if the outer diameter of the whole suction member 10 is decreased to pass through the thin blood vessel 50, it can only be achieved by decreasing the inner diameter of the suction lumen 111, but this will decrease the suction amount of the thrombus and affect the suction effect. According to the invention, the guide cavity 121 is arranged at the far end of the suction cavity 111, and the guide wire is extended into the guide cavity 121 and then drives the suction part 11 to move in the blood vessel 50 by guiding the movement of the tip of the suction member 10, so that the overall outer diameter of the suction member 10 can be reduced under the condition that the inner diameter of the suction cavity 111 is not reduced, and the passing requirement of a thinner blood vessel 50 is met. The distal end of the guide wire is bent to fit the L-shaped profile of the guide lumen 121.

The suction port 112 may be optionally opened with a side wall of the suction portion 11 so that the suction member 10 can suck the thrombus by passing through the blood vessel 50 so that the suction port 112 is facing the thrombus when the thrombus volume is small and conforms to the inner wall of the blood vessel 50, or so that the suction member 10 sucks the thrombus by inserting into and passing through the thrombus so that the suction port 112 enters the lesion site when the thrombus volume is large. Preferably, referring to fig. 1 and 4, a connection portion of the suction portion 11 and the guide portion 12 forms a step structure having a chamfered surface, and the suction port 112 is opened at the chamfered surface. The area of suction opening 112 has been increased in the setting of scarf, is convenient for increase suction area and the suction volume to the thrombus, and the scarf can also make suction opening 112 simultaneously towards distal end and blood vessel 50 inner wall, and no matter like this the thrombus size homoenergetic is aimed at the thrombus, and operating procedure is simple, and the suction effect is better. In addition, the passage of the chamfer to the suction portion 11 also serves as a guide.

Referring to fig. 1 and 4, the suction member 10 further includes a communication chamber 115 isolated from the suction chamber 111, and an opening 117 communicating with a proximal end of the communication chamber 115 and used for opening a fluid into the communication chamber 115, a distal end of the communication chamber 115 communicates with the injection port 202, the suction member 10 further includes a communication portion 13 connecting the suction portion 11, extending toward the circumferential side and communicating with the opening 117, the pressurizer 30 communicates with the communication chamber 115 through the communication portion 13, the communication portion 13 includes a communication opening 116, and the pressurizer 30 is used for injecting a fluid into the communication portion 13 through a communication seat 42 provided in the communication opening 116, so as to switch the balloon member 20 from the contracted state to the expanded state. The communication chamber 115 is used to communicate the balloon chamber 201 and the pressurizer 30 so that the balloon member 20 can be located at a distal position of the suction member 10. In the present embodiment, one or more communicating portions 13 may be provided, and when there are a plurality of chambers of the balloon cavity 201, please refer to fig. 4, a plurality of communicating portions 13 may be provided, wherein one chamber is communicated with one communicating portion 13, and one communicating portion 13 is connected to one pressurizer 30, so that the plurality of chambers of the balloon member 20 can be selected with different degrees of expansion or pressurization according to the requirement, and the usage environment of the balloon catheter is enriched to adapt to complex clinical applications. Wherein, the pressurizer 30 can be selected as a syringe, and the syringe is marked with scale values for indicating the pressurizing size.

Referring to fig. 1 and 4, further, the suction catheter includes a marker ring 60 connected to the suction member 10. The marker ring 60 may be a metal material with poor X-ray permeability so that the user can conveniently locate the aspiration vessel 50 or judge the action state by observing the position of the marker ring 60, and the marker ring 60 may be made of gold, platinum, tantalum, tungsten or a polymer material doped with other metals with poor X-ray permeability, such as a polymer material doped with barium sulfate, bismuth oxide, and the like. In the embodiment of the present invention, the marker ring 60 may be provided at the guide portion 12 to mark the traveling state and orientation of the tip of the suction member 10, or may be provided at the suction portion 11 at a position near the balloon member 20 to mark the position of the balloon member 20.

Preferably, the softness of the suction member 10 is gradually reduced from the distal end to the proximal end, i.e. the distal end of the suction member 10 is soft to facilitate bending deformation to accommodate the complex course of the blood vessel 50 and hard to provide a large supporting force to advance the distal movement. In this embodiment, the suction chamber 111 comprises an inner layer, a middle layer and an outer layer in sequence from inside to outside, wherein the inner layer is made of one or more of polytetrafluoroethylene, polyetheretherketone or high density polyethylene, which are smooth materials, so as to facilitate the circulation of blood. The middle layer is composed of a metal spring, a braided structure or a metal-cut hypotube, so that the softness of the suction catheter is adjusted by setting the structural density of the suction catheter, the structural density is larger, the deformability is larger, namely the softness is larger, the structural density is smaller, the deformability is larger, namely the hardness is larger, wherein the metal spring is composed of 1 to 18 threads, the density of the metal spring is gradually sparse from the far end to the near end, the braided structure is braided by a mode of pressing 16-strand flat wires or 32-strand round wires into two, the braiding density is gradually sparse from the far end to the near end, the hypotube is a metal-cut hypotube, and the cutting density is gradually sparse from the far end to the near end. The outer layer can be made of one or more of polyamide, polyurethane or polyolefin materials with different hardness, the flexibility of the outer layer is gradually reduced from the far end to the near end through process proportioning, and preferably, the outer layer is multi-section reducing and the outer diameter of the suction catheter is gradually increased from the far end to the near end.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An aspiration catheter, comprising:

2. The suction catheter as claimed in claim 1, wherein the balloon member is provided with a plurality of the circulation grooves which are arranged at intervals in a circumferential direction of the balloon member and extend in parallel.

3. A suction catheter according to claim 1 or 2, characterized in that the trough bottom of the circulation groove is the outer wall surface of the suction member.

4. The suction catheter of claim 2, wherein the balloon member is petal-shaped in cross-section.

5. The suction catheter as claimed in claim 1, wherein the outer wall surface of the suction member is provided with a clearance groove, the balloon member covers the notch of the clearance groove, and the groove wall of the clearance groove and the inner wall of the balloon member jointly enclose the balloon cavity.

6. The aspiration catheter of claim 1, wherein the aspiration member further has a guide lumen provided separately from the aspiration lumen and adapted to pass a guide wire therethrough, and a penetration port communicating with a proximal end of the guide lumen and adapted to allow the guide wire to pass through the guide lumen, the guide lumen and the aspiration lumen being arranged to overlap in an extending direction of the aspiration member and being offset in a direction perpendicular to the extending direction of the aspiration member.

7. The suction catheter of claim 6, wherein the suction member includes a suction portion having a tubular shape and a guide portion having a tubular shape and connected to a distal end of the suction portion and having an outer diameter smaller than an outer diameter of the suction portion, the suction chamber is provided in the suction portion, the guide chamber is provided in the guide portion, a stepped structure is formed at a connection of the suction portion and the guide portion, the stepped structure has a chamfered surface, and the suction port is opened in the chamfered surface.

8. The aspiration catheter of claim 1, wherein the aspiration member further has a communication lumen provided separately from the aspiration lumen and an access port communicating with a proximal end of the communication lumen and adapted to access fluid into the communication lumen, a distal end of the communication lumen communicating with the injection port, the aspiration catheter further comprising a pressurizer connected to the aspiration member and communicating with the access port, the pressurizer adapted to meter fluid into the communication lumen through the access port such that the balloon member is switched from the deflated state to the inflated state.

9. The aspiration catheter of claim 1, further comprising a marker ring coupled to the aspiration member.

10. The aspiration catheter of claim 1, wherein the suction member has a degree of flexibility that tapers from the distal end to the proximal end.