Suction catheter

Abstract

The invention provides a suction catheter, an expandable part is arranged at the far end of the suction catheter, and the expandable part comprises a first expandable layer, an expandable assembly and a second expandable layer which are sequentially arranged from inside to outside. When the interior of the expandable assembly is subjected to expansion force, the expandable assembly can expand outwards in the radial direction of the suction catheter, and the first expandable layer and the second expandable layer expand outwards to deform or expand along with expansion of the expandable assembly, so that the inner cavity diameter of the far end of the suction catheter is increased. By the adoption of the thrombus aspiration catheter, the far end of the aspiration catheter can expand outwards when being stressed, so that the stent is pulled into the aspiration catheter more easily, and the risk of thrombus escape is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a suction catheter. Background Art

[0002] There are many existing thrombus removal technologies, including stent implantation and thrombectomy, thrombectomy only by aspiration (such as A Direct Dspiration First Dass Technique, ADAPT technology), and stent and aspiration catheter combination thrombectomy. Stent and aspiration catheter combination thrombectomy technologies include Solumbra technology, stent-assisted vacuum-locked extraction technology (Stentriever assisted vacuum-locked extraction, SAVE technology), and aspiration-Retriever Technique for Stroke (ARTS technology).

[0003] When the Solumbra technique is used for surgery, the main process includes the following: (1) using a three-axis access device to advance the microcatheter to the distal end of the thrombus; (2) implanting the stent into the thrombus; (3) after the stent is combined with the thrombus (3-5 minutes), remove the microcatheter; (4) advance the aspiration catheter to the proximal edge of the thrombus; (5) turn on the vacuum device to aspirate the thrombus through the aspiration catheter; (6) pull the stent into the aspiration catheter.

[0004] When using the SAVE technology, the main process includes the following: (1) using a three-axis access device to advance the microcatheter to the distal end of the thrombus; (2) unfolding the stent so that 1 / 3 of the stent is combined with the thrombus and 2 / 3 is located at the distal end of the thrombus; (3) removing the microcatheter; (4) advancing the aspiration catheter to the proximal edge of the thrombus so that the thrombus is embedded between the tip of the aspiration catheter and the proximal end of the stent; (5) turning on the vacuum to start aspiration through the aspiration catheter; (6) removing the aspiration catheter and stent system through the large-caliber sheath.

[0005] The ARTS technique mainly includes the following steps: (1) using a three-axis access device to push the microcatheter to the distal end of the thrombus; (2) implanting the stent into the thrombus; (3) removing the microcatheter after the stent combines with the thrombus (3-5 minutes); (4) pushing the aspiration catheter to the proximal edge of the thrombus; (5) pushing the outer sheath as far as possible to the distal end; (6) if a balloon catheter is used at the outer sheath, inflate the balloon; (7) pulling the stent into the aspiration catheter until resistance is detected; and (8) removing the aspiration catheter and stent system through the large-caliber sheath.

[0006] Compared with SAVE technology and ARTS technology, Solumbra technology has a simpler operation process and is conducive to saving surgical process time. However, the disadvantage of Solumbra technology is that when the stent is pulled back into the suction catheter, the resistance may increase, causing damage to the suction catheter, and then there is a risk of thrombus rupture and distal thrombus entering the distal blood vessel. SAVE technology and ARTS technology avoid pulling the entire stent and thrombus into the suction catheter, but instead pull the stent and suction catheter back into the large-caliber sheath as a whole. Using this method, the stent does not need to be retracted to the inner diameter of the suction catheter, reducing the risk of thrombus escape. However, the disadvantage of SAVE technology and ARTS technology is that when the suction catheter and stent are pulled into the large-caliber sheath and contact the tip of the large-caliber sheath, there is a risk of thrombus escape. Specifically, when using SAVE technology or ARTS technology for intracranial thrombectomy, the doctor cannot pull the stent into the suction catheter, but pulls the stent and suction catheter back through the large-caliber sheath usually located in the carotid artery. This means that the stent and aspiration catheter system must move several inches after completing intracranial thrombectomy, which may cause the clot to escape and damage the blood vessel. Summary of the invention

[0007] In view of the problems in the prior art, an object of the present invention is to provide a suction catheter, the distal end of which can expand outward when subjected to force, so that the stent can be pulled into the interior of the catheter more easily.

[0008] An embodiment of the present invention provides a suction catheter, wherein an expandable portion is disposed at a distal end of the suction catheter, and the expandable portion includes a first expandable layer, an expandable component, and a second expandable layer which are sequentially disposed from inside to outside.

[0009] In some embodiments, the first expandable layer is a first elastic film, and / or the second expandable layer is a second elastic film.

[0010] In some embodiments, the hardness of the first expandable layer and the second expandable layer are both less than or equal to 25D.

[0011] In some embodiments, the first expandable layer and the second expandable layer are both made of thermoplastic polyurethane, thermoplastic polyethylene, polyamide, polyimide, elastic polyurethane, nylon, polyethylene terephthalate, polytetrafluoroethylene, perfluoroethylene propylene copolymer and / or polyetheretherketone.

[0012] In some embodiments, the expandable portion includes an expanded state and a contracted state; in the contracted state, the first expandable layer and the second expandable layer are at least partially folded; in the expanded state, the expandable component expands radially outward along the suction catheter, and the first expandable layer and the second expandable layer unfold as the expandable component expands.

[0013] In some embodiments, the material of the expandable component comprises nickel titanium alloy.

[0014] In some embodiments, the material of the expandable component further comprises a radiopaque material, wherein the radiopaque material is a combination of one or more of platinum-iridium alloy, platinum-nickel alloy, platinum-tungsten alloy, platinum, tungsten, tantalum, tungsten-tantalum alloy and gold.

[0015] In some embodiments, the expandable component is annular, and a plurality of openings and / or a plurality of grooves distributed along the circumferential direction are formed on the surface of the expandable component, and the plurality of openings and / or the plurality of grooves extend along the circumferential direction or the axial direction.

[0016] In some embodiments, the expandable assembly includes a plurality of helical elements.

[0017] In some embodiments, the size of the expandable component satisfies one or more of the following conditions:

[0018] The expandable component has a thickness between 0.001 inches and 0.005 inches;

[0019] The expandable component has an outer diameter between 0.03 inches and 0.3 inches;

[0020] The expandable member has a length between 0.1 inches and 0.73 inches.

[0021] In some embodiments, the expandable portion further comprises a balloon, wherein the balloon is located between the first expandable layer and the expandable component and is connected to the proximal end of the suction catheter through a lumen.

[0022] In some embodiments, the first expandable layer is fixedly connected to the balloon and / or the expandable component.

[0023] The suction catheter provided by the present invention has the following advantages:

[0024] When the aspiration catheter of the present invention is used in the Solumbra technique, the distal end of the aspiration catheter can expand outward when subjected to force, making it easier for the stent to be pulled into the interior of the aspiration catheter, thereby preventing the stent, hard thrombus and / or large thrombus from damaging the aspiration catheter during the withdrawal of the stent, thereby reducing the risk of thrombus escape. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0026] Figure 1 is a schematic structural diagram of a suction catheter according to a first embodiment of the present invention;

[0027] Figure 2 is a perspective view of an expandable assembly according to a first embodiment of the present invention;

[0028] Figure 3 is a front view of an expandable assembly according to a first embodiment of the present invention;

[0029] Figure 4 is a schematic diagram of the expansion of the expandable assembly according to the second embodiment of the present invention;

[0030] Figure 5 is a schematic diagram of the expansion of the expandable assembly according to the third embodiment of the present invention;

[0031] Figure 6 is a schematic diagram of the expansion of the expandable assembly according to the fourth embodiment of the present invention;

[0032] Figure 7 is a schematic diagram of the expansion of the expandable assembly according to the fifth embodiment of the present invention;

[0033] Figure 8 is a front view of an expandable assembly according to a fifth embodiment of the present invention;

[0034] Fig. 9 is a perspective view of an expandable assembly according to a sixth embodiment of the present invention;

[0035] Fig.10 is a perspective view of an expandable assembly according to a seventh embodiment of the present invention;

[0036] Fig.11 4 is a schematic structural diagram of a suction catheter according to a second embodiment of the present invention.

[0037] Reference numerals:

[0038] 10 Main body 51 Opening

[0039] 20 expandable portion 52 connecting portion

[0040] 1 Inner layer 53 spiral element

[0041] 2 First reinforcement layer 54 groove

[0042] 3 Second reinforcement layer 6 First elastic membrane

[0043] 4 Outer sheath 7 Second elastic membrane

[0044] 5 Expandable component 8 Balloon DETAILED DESCRIPTION

[0045] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments described herein; on the contrary, these embodiments are provided so that the present invention will be comprehensive and complete and the concepts of the example embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated descriptions will be omitted. "Or" and "or" in the specification may both mean "and" or "or". Although the terms "upper", "lower", "between", etc. may be used in this specification to describe different exemplary features and elements of the present invention, these terms are used herein only for convenience, such as according to the directions of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the present invention. Although "first" or "second" etc. are used in this specification to represent certain features, they are only used to represent the function, and are not used as a limitation on the number and importance of specific features. In the present invention, for a component, "distal end" refers to the end away from the operator, and "proximal end" refers to the end close to the operator. For example, in Figure 1 In the perspective of FIG. 1 , the right side of the suction catheter is the distal end, and the left side is the proximal end. The "axial direction" in the present invention refers to the axial direction of the suction catheter, for example, Figure 1 In the perspective of the present invention, the left and right directions are the axial direction, and the "radial direction" of the present invention refers to the radial direction of the suction catheter, for example, the diameter direction in a cross section of the suction catheter perpendicular to the axial direction. The inner side and the outer side in the present invention are relative to the axis of the catheter, the side close to the axis is the inner side, and the side away from the axis is the outer side.

[0046] The present invention provides a suction catheter, wherein the distal end of the suction catheter is provided with an expandable portion, and the expandable portion includes a first expandable layer, an expandable component, and a second expandable layer, which are sequentially arranged from the inside to the outside. When the interior of the expandable component is subjected to an expansion force, it can expand outward along the radial direction of the expandable component, and the first expandable layer and the second expandable layer can expand and deform or unfold outward with the expansion of the expandable component, so that the distal end of the suction catheter expands outward as a whole, increasing the inner cavity diameter of the distal end of the suction catheter. By adopting the present invention, there is no need to use a large-caliber sheath of the SAVE technology or the ARTS technology, and even if the Solumbra technology is used, the stent can be more easily recovered, and it is beneficial to save surgical process time. Specifically, the distal end of the suction catheter can expand outward when subjected to force, so that the stent can be more easily pulled into the interior of the suction catheter, avoiding the situation where the stent, hard thrombus and / or large thrombus damage the suction catheter during the withdrawal process, and reducing the risk of thrombus escape.

[0047] Combine the following Figures 1 to 11The structure of the suction catheter of a specific embodiment of the present invention is specifically described. It is to be understood that the following description is only for example and is not intended to limit the scope of protection of the present invention.

[0048] like Figure 1 As shown, the suction catheter includes a tube body, and the tube body includes a main body 10 and an expandable portion 20 located at the distal end of the main body 10. The expandable portion 20 includes a first expandable layer, an expandable component 5 and a second expandable layer arranged in sequence from the inside to the outside. The expandable portion 20 includes an expanded state and a contracted state; in the contracted state, the first expandable layer and the second expandable layer are at least partially folded or contracted. In the expanded state, the interior of the expandable component 5 can expand outward along the radial direction of the suction catheter when subjected to an expansion force, and the first expandable layer and the second expandable layer expand outwardly and deform or unfold with the expansion of the expandable component 5, so that the distal end of the suction catheter expands outward as a whole, increasing the inner cavity diameter of the distal end of the suction catheter. The expansion force can be achieved by an auxiliary device, a treatment device and / or by a balloon incorporated into the design. By adopting the present invention, in the Solumbra technology, the distal end of the aspiration catheter can expand outward when subjected to force, making it easier for the stent to be pulled into the interior of the aspiration catheter, thereby avoiding the situation where the stent, hard thrombus and / or large thrombus damage the aspiration catheter during the withdrawal of the stent, thereby reducing the risk of thrombus escape.

[0049] like Figure 1As shown, the main body 10 includes an inner layer 1, a reinforcement layer and an outer sheath 4 arranged in sequence from the inside to the outside. The inner layer 1 can be made of PTFE (polytetrafluoroethylene), FEP (perfluoroethylene propylene copolymer), TPE (thermoplastic elastomer) and / or PEEK (polyetheretherketone) materials, and the inner surface has a small friction force, which is convenient for pushing the component through. The thickness of the inner layer 1 can be 0.00025 inches-0.001 inches, for example, 0.00075 inches, but the present invention is not limited to this. The reinforcement layer includes a first reinforcement layer 2 and a second reinforcement layer 3, and the second reinforcement layer 3 is located outside the first reinforcement layer 2. In this embodiment, the first reinforcement layer 2 is a coil layer, which has good flexibility, kink resistance and burst strength. The first reinforcement layer 2 can be made of nickel-titanium alloy material or stainless steel material. The thickness of the first reinforcement layer 2 can be 0.0015 inches-0.004 inches, for example, 0.002 inches. The second reinforcement layer 3 is a braided layer, which has good kink resistance, tensile strength and burst strength. The second reinforcement layer 3 is woven with 8 or 16 braided wires, with 60-120 braided nodes per inch, made of stainless steel or nickel-titanium alloy, with a braided wire height of 0.0007 inches to 0.002 inches, for example, 0.001 inches, and a width of 0.001 inches to 0.004 inches, for example, 0.003 inches. The braiding form of each braided node is 1x1, 2x1, 2x2, and these different variations can be freely combined. The outer sheath 4 is a flexible outer sheath, which can be made of thermoplastic polyurethane material, has good flexibility and burst strength, and its thickness is, for example, 0.003 inches. The hardness of the outer sheath 4 is preferably less than or equal to 25D.

[0050] The first expandable layer and the second expandable layer are both made of flexible materials so as to be movable relative to the expandable component 5. Figure 1As shown, in this embodiment, the first expandable layer is a first elastic membrane 6, and the second expandable layer is a second elastic membrane 7. In the contracted state, the first elastic membrane 6 and the second elastic membrane 7 are at least partially folded, and in the expanded state, the first elastic membrane 6 and the second elastic membrane 7 expand outward with the expansion of the expandable component 5, so that the distal end of the suction catheter expands outward as a whole, increasing the inner cavity diameter of the distal end of the suction catheter. The hardness of the first elastic membrane 6 and the second elastic membrane 7 is less than or equal to 25D, and they can be made of thermoplastic polyurethane (TPU), thermoplastic polyethylene (TPE), polyamide, polyimide, elastic polyurethane, nylon, polyethylene terephthalate (PET), polytetrafluoroethylene, perfluoroethylene propylene copolymer and / or polyetheretherketone, or can be made of other flexible materials with a hardness less than or equal to 25D. The first elastic membrane 6 is connected to the distal end of the inner layer 1, and the second elastic membrane 7 is connected to the distal end of the outer sheath 4, and the first elastic membrane 6 and the second elastic membrane 7 are positioned around the expandable component 5. When the expandable component 5 expands outward, the excess material of the first elastic membrane 6 expands naturally, and the second elastic membrane 7 remains unchanged or partially expands accordingly. The setting of the first elastic membrane and the second elastic membrane enables the suction catheter in the Solumbra technology to expand outward when the thrombus is removed and the stent is withdrawn. The first elastic membrane 6 and the second elastic membrane 7, that is, the distal end can expand but not expand outward, so that the stent is easier to pull into the suction catheter, avoiding the situation where the stent, hard thrombus and / or large thrombus damage the suction catheter during the withdrawal process of the stent, and reducing the risk of thrombus escape.

[0051] In this embodiment, the length of the first elastic membrane 6 and the second elastic membrane 7 is between 0.3 inches and 59 inches. The diameter of the expanded cross-section of the first elastic membrane 6 and the second elastic membrane 7 is between 0.03 inches and 0.3 inches. The burst strength of the first elastic membrane 6 and the second elastic membrane 7 needs to be greater than 200psi. The excess material of the first elastic membrane 6 can be folded inside the suction catheter, or combined with the second elastic membrane 7 at a specific position so that the inner cavity of the suction catheter remains open in the contracted state, and the first elastic membrane 6 can still expand outward when expanded. The excess material of the second elastic membrane 7 can be unfixed, or combined with the first elastic membrane 6 at a specific position to fold it. If the excess material of the second elastic membrane 7 is unfixed or non-folded, the second elastic membrane 7 must be made of flexible material and easy to move relative to the blood vessel when in contact with the blood vessel to avoid being restricted by the blood vessel and affecting the passing performance of the catheter.

[0052] Figures 2 to 10The structures of the expandable components 5 of several embodiments of the present invention are shown. The structures shown here are only examples and are not intended to limit the scope of protection of the present invention.

[0053] like Figure 2 and Figure 3 As shown, in the first embodiment, the expandable component 5 is annular, and the surface of the expandable component 5 is formed with a plurality of openings 51 distributed along the circumferential direction, and the expandable component 5 also includes a connecting portion 52 surrounding the openings 51. By providing a structure with a plurality of openings 51, when the expandable component 5 is subjected to an expansion force, the expandable component 5 can be expanded outward as a whole through the deformation of the openings 51. The circumferential length of the opening 51 increases while the axial length decreases, so that the overall axial length of the expandable component 5 is also shortened. Figure 4 FIG. 2 is a schematic diagram of the structure of an expandable component 5 of a second embodiment, wherein a plurality of openings 51 are arranged circumferentially and in multiple rows axially, and the openings 51 are approximately Z-shaped. Figure 5 and Figure 6 Shown are schematic structural diagrams of the expandable components 5 of the third embodiment and the fourth embodiment. Figure 5 The opening 51 in the housing extends in the axial direction, Figure 6 The opening 51 in the housing extends in the circumferential direction.

[0054] like Figure 7 and Figure 8 FIG. 5 is a schematic diagram of the structure of an expandable component 5 of the fifth embodiment. The expandable component 5 includes a plurality of spiral elements 53, and the number of the spiral elements 53 can be selected according to the length. Fig. 9 As shown, it is a schematic diagram of the structure of the expandable component 5 of the sixth embodiment. Among them, the surface of the expandable component 5 is formed with a plurality of grooves 54 distributed in the circumferential direction, and the expandable component 5 can expand outward as a whole through the expansion deformation of the grooves 54. The plurality of grooves 54 can extend circumferentially or axially. Connecting parts 52 are formed between the grooves 54. The maximum expansion degree of the expandable component 5 can be controlled by the design of the connecting part 52, the interaction between the expandable component 5 and the patient's blood vessels, the structural design of the expandable component 5 and / or the mutual influence between the expandable component 5 and the balloon. Fig.10 , which is a schematic structural diagram of an expandable component 5 according to a seventh embodiment, wherein the expandable component 5 comprises connecting parts 52, and openings 51 are formed between the connecting parts 52. A plurality of openings 51 may be discretely distributed on the surface of the expandable component 5.

[0055] Considering that the doctor may need to use the suction catheter multiple times and must remove the suction catheter from the patient's body. After the expansion force is eliminated, the expandable component 5 can shrink radially inward, so that after the expansion force is eliminated, the expandable component 5 can return to its original shape. In this embodiment, the expandable component 5 adopts a shape memory metal material, such as nickel-titanium alloy. The expandable component 5 can be obtained by a combination of low-density metal and high-density metal (such as platinum-iridium) to improve visibility under radiation fluoroscopy. The combination with high-density metal can include catheter coatings, metal platings, markers, other radiopaque components and any combination of the above. For example, the expandable component 5 includes nickel-titanium alloy material and radiopaque material, and the radiopaque material is a combination of one or more of platinum-iridium alloy, platinum-nickel alloy, platinum-tungsten alloy, tungsten, tantalum, tungsten-tantalum alloy or gold, and the density of the radiopaque material is higher than the density of the nickel-titanium alloy material.

[0056] In this embodiment, the dimensions of the expandable component 5 satisfy: the thickness of the expandable component 5 is between 0.001 inches and 0.005 inches; the inner diameter of the expandable component 5 is between 0.02 inches and 0.2 inches; the outer diameter of the expandable component 5 is between 0.03 inches and 0.3 inches, where the outer diameter refers to the range of change of the outer diameter of the expandable component from the initial shape to the expanded state; the length of the expandable component 5 is between 0.1 inches and 0.73 inches, where the length refers to the length of the expandable component in the axial direction of the suction catheter.

[0057] like Fig.11As shown, it is a schematic diagram of the structure of the suction catheter of the second embodiment of the present invention. The difference between the second embodiment and the first embodiment is that the expandable part 20 also includes a balloon 8, which is located between the first expandable layer and the expandable component 5, is an annular balloon, and is connected to the proximal end of the suction catheter through a separate lumen (not shown in the figure), so that the doctor can manually operate the expandable component 5 at any time during the operation, rather than relying solely on the external expansion force. The hardness of the balloon 8 is less than or equal to 25D, and it can be made of thermoplastic polyurethane (TPU), thermoplastic polyethylene (TPE), polyamide, polyimide, elastic polyurethane, nylon, polyethylene terephthalate (PET) or other flexible materials with a hardness less than or equal to 25D. The material of the balloon 8 must be soft enough so that it can move relative to the expandable component 5. The length of the balloon 8 is between 10mm and 1500mm, the diameter of the expanded section is between 1mm and 10mm, and the burst strength must be greater than 200psi. The balloon 8 may be doped with radiopaque material to improve visibility under radiofluoroscopy. In order to ensure that the inner cavity does not shrink when the balloon 8 is inflated, the first elastic membrane 6 needs to be fixedly connected to the balloon 8 and / or the expandable component 5 so that when the balloon 8 is manually inflated, the first elastic membrane 6 expands outward in the same direction.

[0058] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A suction catheter, characterized in that: The distal end of the suction catheter is provided with an expandable portion, and the expandable portion includes a first expandable layer, an expandable component and a second expandable layer which are sequentially arranged from the inside to the outside.

2. The suction catheter according to claim 1, characterized in that The first expandable layer is a first elastic film, and / or the second expandable layer is a second elastic film.

3. The suction catheter according to claim 1, characterized in that The hardness of the first expandable layer and the second expandable layer are both less than or equal to 25D.

4. The suction catheter according to claim 1, characterized in that The first expandable layer and the second expandable layer are both made of thermoplastic polyurethane, thermoplastic polyethylene, polyamide, polyimide, elastic polyurethane, nylon, polyethylene terephthalate, polytetrafluoroethylene, perfluoroethylene propylene copolymer and / or polyetheretherketone.

5. The suction catheter according to claim 1, characterized in that The expandable portion includes an expanded state and a contracted state; in the contracted state, the first expandable layer and the second expandable layer are at least partially folded; in the expanded state, the expandable component expands radially outward along the suction catheter, and the first expandable layer and the second expandable layer unfold as the expandable component expands.

6. The suction catheter according to claim 1, characterized in that The material of the expandable component includes nickel-titanium alloy.

7. The suction catheter according to claim 6, characterized in that The material of the expandable component also includes a radiopaque material, and the radiopaque material is a combination of one or more of platinum-iridium alloy, platinum-nickel alloy, platinum-tungsten alloy, platinum, tungsten, tantalum, tungsten-tantalum alloy and gold.

8. The suction catheter according to claim 1, characterized in that The expandable component is annular, and a plurality of openings and / or a plurality of grooves distributed along the circumferential direction are formed on the surface of the expandable component, and the plurality of openings and / or the plurality of grooves extend along the circumferential direction or the axial direction.

9. The suction catheter according to claim 1, characterized in that: The expandable assembly includes a plurality of helical elements.

10. The suction catheter according to claim 1, characterized in that The size of the expandable component satisfies one or more of the following conditions: The expandable component has a thickness between 0.001 inches and 0.005 inches; The expandable component has an outer diameter between 0.03 inches and 0.3 inches; The expandable member has a length between 0.1 inches and 0.73 inches.

11. The suction catheter according to claim 1, characterized in that The expandable portion further includes a balloon, which is located between the first expandable layer and the expandable component and is connected to the proximal end of the suction catheter through a lumen.

12. The suction catheter according to claim 11, characterized in that The first expandable layer is fixedly connected to the balloon and / or the expandable component.

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