Suction device

Abstract

The application relates to a suction device. The device comprises a catheter which encloses a suction cavity; a support member which is fixedly connected with the catheter and is provided with a positioning structure; and a cutting member which is fixedly connected with the catheter or the support member at a distal end and is located outside the catheter at a proximal end. With the axial direction and the radial direction of the catheter as references, a reference straight line which extends in the axial direction exists in the suction cavity. The cutting member comprises an elastic cutting part which can be arranged around the reference straight line. The cutting part is movably connected with the support member through the positioning structure and is positioned in the axial direction by the positioning structure. When the proximal end of the cutting member is pushed or pulled, the cutting part expands or shrinks in the radial direction in the suction cavity. In this way, the cutting part cuts the thrombus to increase the flowability of the thrombus in the suction cavity, thereby ensuring that the thrombus is smoothly sucked out of the catheter. In the process of cutting the thrombus by the cutting member, the catheter does not need to be withdrawn from the body, so that the time for multiple withdrawals and inputs of the catheter can be eliminated, thereby improving the thrombus suction efficiency.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a suction device. Background Technology

[0002] Aspiration devices are interventional treatments used to treat vascular occlusion caused by thrombosis. During thrombectomy, the catheter of the aspiration device is inserted into the blood vessel via a guide instrument. The distal end of the catheter reaches the location of the blockage, while the proximal end is usually equipped with a negative pressure device such as a suction pump or a negative pressure injector. This device generates negative pressure inside the catheter to effectively capture and aspirate the thrombus, thus rapidly clearing the thrombus and restoring vascular patency, reducing tissue ischemia time, and lowering the risk of complications. Compared to traditional thrombolytic therapy, aspiration avoids the reperfusion injury caused by thrombolysis, thereby protecting surrounding healthy tissue. Compared to traditional open surgery, aspiration has the advantages of being less invasive, having a faster recovery time, and requiring a shorter hospital stay.

[0003] Due to limitations in physical principles, the negative pressure energy generated by a negative pressure device is finite (no more than one atmosphere). During the use of the aspiration device, when the thrombus load is large and has high viscosity and toughness, the thrombus usually blocks the inside of the catheter, making it impossible to aspirate. The operator typically needs to remove the catheter, clear it, and then reinsert it for thrombus aspiration. This prolongs the surgical procedure and reduces the efficiency of thrombus aspiration. Summary of the Invention

[0004] One technical problem addressed by this application is how to improve the suction efficiency of the aspiration device for thrombi.

[0005] A suction device, comprising:

[0006] The catheter forms a suction cavity;

[0007] The support member is fixedly connected to the conduit and is provided with a positioning structure; and

[0008] The cutting element has its distal end fixedly connected to the catheter or the support and its proximal end located outside the catheter. With the axial and radial directions of the catheter as a reference, there exists a reference straight line extending along the axial direction within the suction cavity. The cutting element includes an elastic cutting portion that can be arranged around the reference straight line. The cutting portion is movably connected to the support through the positioning structure, and the positioning structure positions the cutting portion in the axial direction. When the proximal end of the cutting element is pushed or pulled, the cutting portion can expand or contract in the radial direction within the suction cavity.

[0009] In one embodiment, the support member is embedded in the conduit and extends a predetermined length parallel to the axial direction. Multiple positioning structures are provided and spaced apart along the axial direction. A groove is formed in the inner wall of the suction cavity. The cutting part is at least partially received in the groove in its natural state.

[0010] In one embodiment, the catheter includes a first layer and a second layer of different materials, the first layer passing through the second layer and forming the suction cavity, and the support member being sandwiched between the first layer and the second layer.

[0011] In one embodiment, the positioning structure is a positioning cavity, and the cutting part is fitted with the positioning cavity with a clearance and sleeved on the support member.

[0012] In one embodiment, at least one of the following schemes is also included:

[0013] The cutting section is spiral-shaped; or

[0014] The reference line is the central axis of the catheter.

[0015] In one embodiment, the cutting member further includes a connecting portion extending along the axial direction. The cutting portions are annular and there are multiple cutting portions. The multiple cutting portions are spaced apart along the axial direction and connected in series by the connecting portion. The connecting portion is connected to the ends of the multiple cutting portions to drive the cutting portions to contract or expand.

[0016] In one embodiment, the plane containing the cutting portion is set at an acute angle to the axial direction.

[0017] In one embodiment, the planes containing the plurality of cut portions are parallel to each other.

[0018] In one embodiment, the cutting member further includes a reinforcing portion connected between two adjacent cutting portions and capable of being located within the suction cavity.

[0019] In one embodiment, at least one end of the reinforcing part is fixedly connected to a movable member, and the movable member is movably connected to the cutting part.

[0020] One technical advantage of one embodiment of this application is that, given that the cutting part can repeatedly contract or expand radially along the catheter within the aspiration chamber, it repeatedly cuts and breaks up large thrombi into smaller ones. This reduces the adhesion between the thrombus and the catheter, as well as the cohesion within the thrombus, thereby increasing the fluidity of the thrombus within the aspiration chamber and ensuring that the thrombus is smoothly extracted from the aspiration chamber to the outside of the catheter under negative pressure. During the process of cutting the thrombus, there is no need to withdraw the catheter from the body, thus eliminating the time spent on multiple catheter withdrawals and infusions, thereby further improving the thrombus aspiration efficiency. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of a suction device provided in one embodiment.

[0022] Figure 2 for Figure 1 A three-dimensional cross-sectional view of the suction device shown.

[0023] Figure 3 for Figure 1 A schematic diagram of the planar cross-sectional structure of the suction device shown.

[0024] Figure 4 for Figure 1 A three-dimensional structural diagram of the support component in the suction device shown.

[0025] Figure 5 for Figure 1 The diagram shows a partial three-dimensional structure of the suction device, including the first layer, the cutting component, and the support component.

[0026] Figure 6 for Figure 5 A schematic diagram of its decomposed structure.

[0027] Figure 7 for Figure 1 The diagram shows a partial three-dimensional structure of the suction device, including the cutting component and the support component.

[0028] Figure 8 for Figure 7 A schematic diagram of the planar structure.

[0029] Figure 9 A partial three-dimensional structural diagram of a suction device, including a cutting element and a support element, provided for another embodiment.

[0030] Figure 10 for Figure 9 A schematic diagram of the planar structure.

[0031] Figure 11 This is a partial three-dimensional structural diagram of a suction device, including a cutting element and a support element, provided in another embodiment.

[0032] Figure 12 for Figure 11 A schematic diagram of the planar structure.

[0033] Reference numerals: suction device 10, conduit 100, suction chamber 110, groove 120, first layer 131, second layer 132, third layer 133, support member 200, positioning structure 210, positioning cavity 211, cutting member 300, cutting part 310, connecting part 320, reinforcing part 330, moving part 340, interval area 350, operating handle 400, vacuum channel 410, push-pull channel 420, sealing member 500. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0035] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0036] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0040] See Figure 1 , Figure 2 and Figure 3This application provides an aspiration device 10 for aspirating thrombi in one embodiment. The aspiration device 10 includes a catheter 100, a support 200, a cutting component 300, an operating handle 400, and a sealing component 500. The catheter 100 has an aspiration chamber 110 for aspirating thrombi. The operating handle 400 is connected to the proximal end of the catheter 100. The operating handle 400 has a vacuum channel 410 and a push-pull channel 420, which are interconnected. The vacuum channel 410 is also interconnected with the aspiration chamber 110. The vacuum channel 410 and the aspiration chamber 110 can be coaxially arranged, meaning their extension directions are the same; the extension directions of the vacuum channel 410 and the push-pull channel 420 can be at an acute angle. The sealing component 500 cooperates with the push-pull channel 420 and seals it. The support member 200 is fixedly connected to the conduit 100. The cutting member 300 passes through the seal 500 and the push-pull channel 420, and the distal end of the cutting member 300 can extend to the distal end of the conduit 100, so that the distal end of the cutting member 300 is fixedly connected to the conduit 100 and / or the support member 200. The proximal end of the cutting member 300 is located outside the push-pull channel 420, so that the operator can exert a push-pull action on the cutting member 300 by holding the proximal end of the cutting member 300.

[0041] See Figure 1 , Figure 2 and Figure 3 The negative pressure device can be set at the end of the vacuum channel 410. When the negative pressure device generates negative pressure, the negative pressure will be conducted to the suction chamber 110 through the vacuum channel 410. Under the action of the negative pressure in the suction chamber 110, the thrombus in the blood vessel will enter the suction chamber 110 and flow out of the suction chamber 110 to the outside of the catheter 100. In this way, the suction device 10 can perform the suction effect on the thrombus, and finally achieve the purpose of restoring blood vessel patency. Since the cutting element 300 is inserted into the sealing element 500, and the sealing element 500 is tightly fitted outside the cutting element 300, the gap between the sealing element 500 and the cutting element 300 is eliminated, preventing the push-pull channel 420 from communicating with the outside through the gap between the sealing element 500 and the cutting element 300; at the same time, the sealing element 500 seals the push-pull channel 420, preventing the push-pull channel 420 from communicating with the outside through the gap between the sealing element 500 and the operating handle 400. In this way, the push-pull channel 420 and the cutting element 300 will not affect the negative pressure in the suction chamber 110, ensuring that the thrombus in the blood vessel flows out through the suction chamber 110 to the outside of the catheter 100 under the action of sufficient vacuum suction force.

[0042] See Figure 4 , Figure 5 and Figure 6In some embodiments, the cutting element 300 is curved, such that the curved portion of the cutting element 300 forms a cutting portion 310. At least the cutting portion 310 of the cutting element 300 is elastic. A reference straight line extending axially along the conduit 100 exists within the suction cavity 110. In its natural state, the cutting portion 310 surrounds this reference straight line. For example, the reference straight line can be the central axis of the conduit 100, or it can be a straight line parallel to the central axis of the conduit 100. The support member 200 is provided with a positioning structure 210, with the axial and radial directions of the conduit 100 as references. The cutting portion 310 is movably connected to the support member 200 through the positioning structure 210, and the positioning structure 210 provides axial positioning for the cutting portion 310. When the proximal end of the cutting element 300 is pushed or pulled, the cutting portion 310 can expand or contract radially within the suction cavity 110. For example, when a tensile force is applied to the proximal end of the cutting element 300, the cutting portion 310 will radially contract, causing it to gradually move radially closer to the support member 200. When the cutting portion 310 is radially contracting, the tensile force can be removed, allowing the cutting portion 310 to gradually move radially away from the support member 200 under its own elastic force. This allows the cutting portion 310 to return to its original shape and radially expand. Alternatively, a pushing force can be applied to the proximal end of the pushing / pulling element 300, causing the cutting portion 310 to quickly return to its original shape and radially expand under the combined action of its own elastic force and the pushing / pull. The cutting element 300 here is elastic and can be heat-set, allowing it to be naturally curved. When the proximal end of the cutting element 300 is subjected to tensile force, the cutting portion 310 will radially contract, and when the tensile force is removed, the cutting portion 310 can spontaneously return to its natural state.

[0043] In this embodiment, the positioning structure 210 is a separate component and needs to be mounted on the support member 200. In other embodiments, the support member 200 includes the positioning structure 210, which can be directly set and formed on the support member 200.

[0044] Therefore, when a thrombus forms in the aspiration chamber 110, a pulling force can be applied to the proximal end of the cutting element 300, thereby cutting the thrombus radially through the cutting part 310. When a pushing force is applied to the proximal end of the cutting element 300, the cutting element 300 will expand radially from a contracted state, also cutting the thrombus. Thus, by repeatedly pushing and pulling the proximal end of the cutting element 300, the cutting part 310 will undergo multiple radial expansions and contractions, thereby cutting the thrombus multiple times. This will cut large thrombi into multiple smaller pieces, reducing the adhesion between the thrombus and the catheter 100, and also reducing the cohesion within the thrombus. This will increase the fluidity of the thrombus in the aspiration chamber 110, ensuring that the thrombus is drawn out of the aspiration chamber 110 under negative pressure and exits the catheter 100. This effectively prevents thrombi remaining in the catheter 100 from blocking the aspiration chamber 110, ensuring that thrombi in the blood vessel are quickly discharged through the aspiration chamber 110.

[0045] See Figure 3 , Figure 4 and Figure 5 In some embodiments, the support member 200 is embedded within the conduit 100. The support member 200 may be linear and extend along the axial direction of the conduit 100 for a predetermined length; for example, the length of the support member 200 may be approximately equal to the length of the conduit 100. Multiple positioning structures 210 are provided, spaced apart along the axial direction of the conduit 100. A groove 120 is recessed on the inner wall surface of the suction cavity 110, and obviously, the groove 120 communicates with the suction cavity 110. The cutting portion 310 is at least partially contained within the groove 120 in its natural state; for example, the cutting portion 310 may be completely contained within the groove 120 in its natural state. By embedding the support member 200 within the catheter 100, and ensuring that the cutting portion 310 is at least partially housed within the groove 120 in its natural state, the space occupied by the support member 200 and the cutting portion 310 within the suction chamber 110 can be reduced. This maximizes the effective volume of the suction chamber 110, thereby increasing the amount of thrombus aspirated per unit time and improving the efficiency of the suction device 10 in aspirating thrombi. Consequently, the time required for thrombus aspiration surgery is reduced, minimizing the adverse effects on the patient caused by prolonged thrombus aspiration. Furthermore, with the volume of the suction chamber 110 remaining constant, the cutting portion 310 can fully utilize the space of the groove 120, thereby reducing the weight and volume of the catheter 100 and reasonably increasing its flexibility. During the process of implanting the catheter 100 into the blood vessel, the catheter 100 can be quickly deformed to adapt to the shape of the blood vessel, allowing the catheter 100 to be implanted into the blood vessel quickly. This can be understood as improving the catheter 100's permeability in the body, which can also reduce the time of thrombectomy and reduce the adverse effects on the patient caused by prolonged thrombectomy.

[0046] In other embodiments, when the negative pressure and the volume of the suction chamber 110 are sufficiently large, the support 200 can be directly attached to the inner wall of the suction chamber 110, and the cutting portion 310 can be entirely located within the suction chamber 110. In fact, when the cutting portion 310 is located within the suction chamber 110, during the flow of the thrombus within the suction chamber 110, the thrombus collides with the cutting portion 310, causing the cutting portion 310 to impact and cut the thrombus. This can reasonably increase the fluidity of the thrombus within the suction chamber 110, ensuring that the thrombus in the blood vessel is quickly discharged through the suction chamber 110. It can be understood that when the groove 120 is provided on the catheter 100, in its natural state, a portion of the cutting portion 310 can be located within the groove 120, thus reasonably increasing the effective volume of the suction chamber 110; the other portion of the cutting portion 310 is located within the suction chamber 110, so the portion of the cutting portion 310 within the suction chamber 110 impacts and cuts the thrombus, thereby improving the fluidity of the thrombus. Therefore, by reasonably controlling the volume of the cutting part 310 within the groove 120 and the suction chamber 110, a good balance can be achieved between increasing the effective volume of the suction chamber 110 and improving the fluidity of the thrombus.

[0047] See Figure 3 and Figure 4 In some embodiments, the catheter 100 includes a first layer 131, a second layer 132, and a third layer 133 made of different materials. The first layer 131 forms a suction cavity 110. The second layer 132 is fitted over the first layer 131, and the third layer 133 is fitted over the second layer 132, such that the second layer 132 is located between the first layer 131 and the third layer 133. The first layer 131 can be made of metal or polymer material. The second layer 132 can be a braided layer, and the third layer 133 can provide good protection for the second layer 132. A support member 200 is sandwiched between the first layer 131 and the second layer 132, which allows the support member 200 to be well positioned radially in the catheter 100. The support member 200 can be fixedly connected to the first layer 131 and / or the second layer 132 by adhesive or heat fusion.

[0048] In this embodiment, the groove 120 can penetrate the first layer 131 radially, which allows the cutting part 310 to be better housed in the tube wall of the conduit 100, avoiding occupying the space of the suction chamber 110, thereby increasing the suction efficiency; in other embodiments, the groove 120 can be set on the inner surface of the first layer 131 and does not penetrate the first layer 131 radially.

[0049] See Figure 3 and Figure 4In some embodiments, the positioning structure 210 can be a positioning cavity 211. Obviously, the positioning cavity 211 is a virtual structure. The cutting part 310 is clearance-fitted with the positioning cavity 211 and sleeved on the support member 200. This allows the cutting part 310 to slide relative to the positioning cavity 211 along its extension direction, thereby allowing the cutting member 300 to adapt to the radial expansion or contraction caused by the cutting part 310. The positioning cavity 211 can be a groove structure, i.e., a circumferentially non-closed structure; or it can be a hole structure, making it a circumferentially closed structure. In other embodiments, the positioning structure 210 can also be a solid structure, as long as it can achieve axial positioning of the cutting part 310 and movable connection with the support member 200.

[0050] See Figure 6 , Figure 7 and Figure 8 In some embodiments, the cutting portion 310 can be spatially spiral-shaped, making it similar to a spring structure. In this case, when the groove 120 is present on the conduit 100, the groove 120 is also spatially spiral-shaped. This simplifies the manufacturing cost of the cutting portion 310 and the entire cutting component 300, reduces the assembly difficulty and time between the cutting component 300 and the conduit 100, thereby improving the assembly efficiency of the entire suction device 10 and ultimately reducing the manufacturing cost of the entire suction device 10.

[0051] See Figure 9 and Figure 10In some embodiments, the cutting element 300 further includes a connecting portion 320, which may be linear and extend axially along the conduit 100. The connecting portion 320 is connected to the end of the cutting portion 310, and any two adjacent cutting portions 310 are connected through the connecting portion 320. Specifically, the cutting element 300 may be a wire structure. The cutting element 300 extends along an axial direction, passes through the positioning cavity 211 on the support member 200, then circles around to form a cutting portion 310, and then passes through the same positioning cavity 211 again, continuing to extend along the same axial direction to another positioning cavity 211 to form another cutting portion 310. The portion of the cutting element 300 extending along the axial direction forms the connecting portion 320. When a push-pull force is applied to the proximal end of the cutting element 300, the push-pull force acting on the cutting element 300 can be transmitted to the cutting portion 310 through the connecting portion 320, thereby causing the connecting portion 320 to drive the cutting portion 310 to produce radial contraction or expansion. The cutting portion 310 is annular, for example, it can be roughly circular. When the cutting portion 310 expands radially, its diameter increases; when it contracts radially, its diameter decreases. Alternatively, the cutting portion 310 can be elliptical, etc. Multiple cutting portions 310 are arranged at intervals along the axial direction of the catheter 100 and connected in series by the connecting portion 320. When a pushing or pulling force is applied to the proximal end of the cutting element 300, the multiple cutting portions 310 can simultaneously contract and expand radially, thereby enabling them to simultaneously cut the thrombus and improve the thrombus-breaking ability of the cutting element 300.

[0052] See Figure 10 In some embodiments, the roughly circular cutting section 310 is positioned at an acute angle α to the axial direction. This can be understood as the cutting section 310 being inclined relative to the catheter 100 rather than perpendicular to it. Thus, during the radial contraction and expansion of the cutting section 310, the force exerted on the thrombus can be decomposed into radial and axial forces. The radial force generates a radial shear force along the radial direction of the catheter 100 on the thrombus; the axial force generates a thrust along the axial direction of the catheter 100 on two adjacent small thrombus fragments after cutting, causing them to move away from each other or tend to move away from each other. This effectively reduces the cohesion within the thrombus, thereby increasing the fluidity of the thrombus within the aspiration chamber 110, further ensuring that the thrombus in the blood vessel is quickly discharged through the aspiration chamber 110. In other embodiments, the cutting section 310 may be perpendicular to the axial direction of the catheter 100.

[0053] See Figure 10In some embodiments, for the generally circular cutting portions 310, the planes on which the multiple cutting portions 310 are located can be parallel to each other. This can reduce the manufacturing difficulty and cost of the cutting component 300, and improve the force balance of the cutting component 300, avoiding the jamming phenomenon that occurs during the radial expansion and radial contraction of each cutting portion 310, and ensuring that the cutting portion 310 can effectively cut and break up the thrombus under the action of push and pull forces.

[0054] See Figure 11 and Figure 12 In some embodiments, for the generally circular cutting portion 310, the cutting member 300 may further include a reinforcing portion 330, which is connected between two adjacent cutting portions 310 and can be located within the suction chamber 110. During the radial expansion and radial contraction of the cutting portion 310, the reinforcing portion 330 can move closer to or further away from the support member 200, so that the reinforcing portion 330 also has a cutting effect on the thrombus. It can be understood that, based on the small thrombus block formed by the radial cutting of the cutting portion 310 along the catheter 100, the reinforcing portion 330 can continue to cut the small thrombus block along the axial direction of the catheter 100, thereby cutting the small thrombus block into a smaller thrombus block, which can further reduce the cohesion within the thrombus and the adhesion between the thrombus and the inner wall of the suction chamber 110, thereby further improving the fluidity of the thrombus within the suction chamber 110.

[0055] In some embodiments, for a generally circular cut portion 310, for two axially adjacent reinforcing portions 330, each reinforcing portion 330 is connected to a different cut portion 310. This avoids the situation where two reinforcing portions 330 are provided on the same cut portion 310, ensuring that one cut portion 310 is connected to one reinforcing portion 330. This can be simply understood as two adjacent reinforcing portions 330 being spaced a large distance apart. See [reference needed] Figure 12 The spacer region 350 between two adjacent reinforcing portions 330 along the central axis is approximately equal to the distance between two adjacent cutting portions 310. This avoids the reinforcing portions 330 restricting or interfering with the radial expansion and contraction of the cutting portions 310, ensuring that the cutting portions 310 can effectively cut and break up the thrombus under the action of pushing and pulling forces.

[0056] In some embodiments, the reinforcing part 330 is a V-shaped structure; in other embodiments, the reinforcing part 330 may also be a straight structure, a W-shaped structure, etc.

[0057] In some embodiments, see Figure 11At least one end of the reinforcing part 330 is fixedly connected to a movable member 340, which is movably connected to the cutting part 310, thereby enabling the reinforcing part 330 to move relative to the cutting part 310 and preventing the reinforcing part 330 from restricting the radial expansion and radial contraction of the cutting part 310.

[0058] It is understood that thrombi can include soft thrombi and hard thrombi. Soft thrombi have relatively low viscosity, while hard thrombi have relatively high viscosity. During the use of the aspiration device 10, when the aspiration chamber 110 draws in soft thrombi from the blood vessel, or when the drawn-in hard thrombi do not obstruct the aspiration chamber 110, it is not necessary to push or pull the cutting element 300. The cutting part 310 remains in its natural state and is housed in the groove 120 of the catheter 100, preventing the cutting part 310 from entering the aspiration chamber 110 and occupying the flow space of the thrombus, thereby improving the aspiration efficiency. When the aspiration chamber 110 draws in hard thrombi from the blood vessel and obstructs the aspiration chamber 110, the cutting element 300 can be repeatedly pushed and pulled, causing the cutting part 310 to cut the thrombus, improving its flowability and ultimately increasing the aspiration efficiency.

[0059] During the process of cutting the thrombus with the cutting element 300, there is no need to remove the catheter 100 from the body. This eliminates the time spent on multiple removals and infusions of the catheter 100, thereby further improving the efficiency of thrombus aspiration.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A suction device, characterized in that, include: The catheter forms a suction cavity; The support component is fixedly connected to the conduit and is provided with a positioning structure; and The cutting element has its distal end fixedly connected to the catheter or the support and its proximal end located outside the catheter. With the axial and radial directions of the catheter as a reference, there exists a reference straight line extending along the axial direction within the suction cavity. The cutting element includes an elastic cutting portion that can be arranged around the reference straight line. The cutting portion is movably connected to the support through the positioning structure, and the positioning structure positions the cutting portion in the axial direction. When the proximal end of the cutting element is pushed or pulled, the cutting portion can expand or contract in the radial direction within the suction cavity.

2. The suction device according to claim 1, characterized in that, The support member is embedded in the conduit and extends a set length parallel to the axial direction. Multiple positioning structures are provided and spaced apart along the axial direction. A groove is formed on the inner wall surface of the suction cavity. The cutting part is at least partially housed in the groove in its natural state.

3. The suction device according to claim 2, characterized in that, The catheter includes a first layer and a second layer made of different materials. The first layer passes through the second layer and forms the suction cavity. The support is sandwiched between the first layer and the second layer.

4. The suction device according to claim 1, characterized in that, The positioning structure is a positioning cavity, and the cutting part is fitted with the positioning cavity with a clearance and sleeved on the support member.

5. The suction device according to claim 1, characterized in that, It also includes at least one of the following options: The cutting section is spiral-shaped; or The reference line is the central axis of the catheter.

6. The suction device according to claim 1, characterized in that, The cutting component further includes a connecting portion extending along the axial direction. The cutting portions are annular and there are multiple cutting portions. The multiple cutting portions are spaced apart along the axial direction and connected in series by the connecting portion. The connecting portion is connected to the ends of the multiple cutting portions to drive the cutting portions to contract or expand.

7. The suction device according to claim 6, characterized in that, The plane containing the cutting section is set at an acute angle to the axial direction.

8. The suction device according to claim 6, characterized in that, The planes containing the multiple cutting portions are parallel to each other.

9. The suction device according to claim 6, characterized in that, The cutting component also includes a reinforcing part, which is connected between two adjacent cutting parts and can be located within the suction cavity.

10. The suction device according to claim 9, characterized in that, At least one end of the reinforcing part is fixedly connected to a movable member, and the movable member is movably connected to the cutting part.

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