Suction device

Abstract

The application provides a suction device, comprising a suction catheter, a support removal member, an extension catheter and a suction device, the suction catheter has a suction cavity, a suction outlet communicated to the proximal end of the suction cavity and a suction inlet communicated to the distal end of the suction cavity, the support removal member is located in the suction cavity and can be probed out of the suction inlet and can perform removal operation on a thrombus after being probed out of the suction inlet; the suction device is used for generating negative pressure in the suction cavity, the suction device is connected to the suction catheter or the suction device is connected to the support removal member and is communicated with the suction cavity through the support removal member, the suction inlet is used for sucking the thrombus through the negative pressure of the suction cavity; the extension catheter is connected between the suction catheter and the suction device or between the support removal member and the suction device. The suction device can make large thrombus be broken into small pieces and then be sucked into the suction cavity through the suction inlet by the arrangement of the support removal member, the suction efficiency is improved, and the thrombus can be cleaned in the blood vessel.

Description

Technical Field

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

[0002] Among AMI patients undergoing primary percutaneous coronary intervention (PCI), 5%-10% of patients still fail to achieve effective perfusion of distal myocardial tissue even after the infarct-related artery is opened, and may even suffer cardiac death or other adverse cardiac reactions. Acute ST-segment elevation myocardial infarction (STEMI) is primarily caused by rupture of unstable atherosclerotic plaques and acute thrombosis leading to luminal occlusion, resulting in necrosis of the corresponding myocardium. Emergency primary percutaneous coronary intervention (PCI) plays an important role in opening infarct-related vessels and restoring distal myocardial perfusion. During emergency PCI procedures, some patients still experience "slow blood flow" or "no reflow." One of the main reasons is distal microvascular embolism caused by fresh thrombus or plaque detachment during conventional balloon dilatation and stent implantation, which seriously affects the immediate treatment effect and long-term prognosis of STEMI patients. Therefore, during emergency PCI, the use of assistive devices that may reduce thromboembolism to clear intracoronary thrombi, improve myocardial perfusion, and enhance clinical efficacy has attracted considerable attention. Thrombus aspiration catheters are currently the most commonly used thrombus removal devices in clinical practice, and their value in emergency PCI is gradually gaining recognition.

[0003] In actual clinical applications, since the thrombus is adhered to the blood vessel wall, when only the negative pressure generated by the thrombus aspiration device is used to aspirate the thrombus in the coronary artery, the aspiration efficiency is relatively low, and larger thrombi are difficult to aspirate completely. Summary of the Invention

[0004] The purpose of the present invention is to provide a suction device, which aims to solve the technical problems in the existing technology of thrombus removal, which is a method of thrombus removal that only uses negative pressure to absorb thrombi, that is, the thrombus removal efficiency is relatively low and larger thrombi are difficult to be completely aspirated.

[0005] The present invention is achieved in that a suction device comprises:

[0006] A suction catheter having a suction cavity, a suction port connected to the proximal end of the suction cavity, and a suction port connected to the distal end of the suction cavity;

[0007] a support and removal member, located in the suction cavity and capable of bending together with the suction catheter, and capable of protruding from the suction port, and capable of removing the thrombus after protruding from the suction port;

[0008] An aspirator is used to generate negative pressure in the aspiration chamber. The aspirator is connected to the aspiration catheter, or the aspirator is connected to the support removal member and communicates with the aspiration chamber through the support removal member. The aspiration inlet is used to aspirate thrombus through the negative pressure of the aspiration chamber.

[0009] Furthermore, the support removal member includes a removal component passing through the suction chamber and a controller connected to the proximal end of the removal component. The controller is used to control the removal component to perform a removal operation and has a control state for limiting the movement of the removal component and an unlocking state for releasing the restriction on the removal component.

[0010] Furthermore, the removal assembly includes a support rod connected to the controller and a screw connected to the distal end of the support rod and used to remove the thrombus. When the controller is in an unlocked state, the screw can extend out of the suction port and remove the thrombus through reciprocating motion.

[0011] Furthermore, the screwing member is provided with a spiral groove in its circumference.

[0012] Furthermore, the removal assembly further includes a screw-type connection member circumferentially spirally protruding from the screw-type connection member.

[0013] Furthermore, the rod diameter of the support rod gradually increases from the distal end to the proximal end.

[0014] Furthermore, the suction device also includes an extension catheter connected to the proximal end of the suction catheter, the extension catheter is connected to the extraction port at its distal end, and is connected to the aspirator at its proximal end.

[0015] Furthermore, the suction catheter also has a guide cavity isolated from the suction cavity and used for passing the guide wire, and an entry port connected to the proximal end of the guide cavity and used for the guide wire to pass through the guide cavity. The guide cavity and the suction cavity are overlapped in the extension direction of the suction catheter and are staggered in a direction perpendicular to the extension direction of the suction catheter.

[0016] Furthermore, the suction catheter includes a tubular suction portion, a tubular guide portion located at the distal end of the suction portion and having an outer diameter smaller than the outer diameter of the suction portion, and a connecting portion for connecting the distal end of the suction portion with the proximal end of the guide portion, the suction cavity is provided in the suction portion, the guide cavity is provided in the guide portion, a step structure is formed at the connection between the suction portion and the connecting portion, the step structure has an oblique surface, the suction inlet is opened on the oblique surface, the central axis of the suction portion and the guide portion are parallel to or coincide with each other, and the penetration port and the suction inlet are located on both sides of the connecting portion.

[0017] Furthermore, the suction catheter has at least a tubular middle layer, an outer layer covering the outside of the middle layer, and a tubular inner layer arranged inside the middle layer. The middle layer is one or more of a spring tube, a braided tube or a sea wave tube. The density of the middle layer gradually decreases from the distal end to the proximal end. The inner layer is arranged to form the suction cavity, and the inner layer has a smooth inner wall surface.

[0018] The technical effect of the present invention compared with the prior art is that the suction catheter of the suction device of the present invention can extend in the blood vessel. After the suction catheter moves to the diseased area and the suction inlet is aligned with the thrombus, the support and removal component can remove the thrombus by protruding out of the suction inlet, so that the thrombus is cut off or broken from the blood vessel wall, and the thrombus is able to fall off the blood vessel wall and break into small pieces. At this time, the aspirator performs suction on the suction chamber to generate negative pressure in the suction chamber. The thrombus is sucked into the suction chamber under the action of the negative pressure and is extracted. The setting of the support and removal component enables larger thrombi to be sawed into small pieces and then sucked into the suction chamber from the suction inlet, thereby improving the suction efficiency and allowing the thrombus to be cleaned up in the blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 is a three-dimensional structural diagram of a suction device provided by an embodiment of the present invention;

[0021] Figure 2 This is a diagram of an application scenario of the suction device provided by an embodiment of the present invention;

[0022] Figure 3 is a diagram of the working state of the suction device provided by an embodiment of the present invention, wherein the support and removal member is located in the suction chamber;

[0023] Figure 4 is a diagram of the working state of the suction device provided by an embodiment of the present invention, wherein the support and removal member protrudes out of the suction inlet;

[0024] Figure 5 is a three-dimensional structural diagram of a suction catheter provided by an embodiment of the present invention;

[0025] Figure 6 is a cross-sectional view of a suction catheter provided by an embodiment of the present invention;

[0026] Figure 7 is a three-dimensional structural diagram of a support removal member provided by an embodiment of the present invention;

[0027] Figure 8a This is a schematic structural diagram of an embodiment of the present invention in which the middle layer is a metal spring;

[0028] Figure 8b This is a schematic structural diagram of an embodiment of the present invention in which the middle layer is a metal spring;

[0029] Figure 8c This is a schematic structural diagram of an embodiment of the present invention in which the middle layer is a metal spring;

[0030] Figure 9a It is a screwing member in an embodiment provided by an embodiment of the present invention;

[0031] Figure 9b It is a screwing member in another embodiment provided by an embodiment of the present invention;

[0032] Description of reference numerals:

[0033] 10. Suction catheter; 101. Suction cavity; 102. Suction port; 103. Suction port; 104. Beveled surface; 11. Guide portion; 111. Guide cavity; 112. Penetration port; 12. Suction portion; 121. Middle layer; 122. Outer layer; 123. Inner layer; 13. Connecting portion; 14. Catheter hub; 15. Stress relief tube; 16. Luer connector; 20. Support and removal member; 21. Removal assembly; 211. Support rod; 212. Screw; 2121. Spiral groove; 213. Screwed member; 22. Controller; 30. Marking ring; 60. Aspirator; 71. Blood vessel; 72. Thrombus; 80. Guidewire DETAILED DESCRIPTION

[0034] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0035] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features indicated. Therefore, a feature designated as "first," "second," or "third" may explicitly or implicitly include one or more of such features.

[0036] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0037] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0038] The embodiment of the present invention provides a suction device for aspirating thrombus 72, please refer to Figure 1 and Figure 2 The suction device includes a suction catheter 10, a support removal member 20 connected to the suction catheter 10, an aspirator 60 for providing suction power to the suction catheter 10, and a marker ring 30 provided on the suction catheter 10. Along the extension direction of the suction catheter 10, the direction close to the operating end is referred to as proximal, and the direction away from the operating end is referred to as distal.

[0039] Please refer to Figure 6 and Figure 7 The suction catheter 10 has a suction chamber 101, a suction port 103 connected to the proximal end of the suction chamber 101, and a suction port 102 connected to the distal end of the suction chamber 101. Figure 2 and Figure 3The support and removal member 20 is located in the suction chamber 101 and can be extended from the suction port 102. After extending from the suction port 102, the thrombus 72 can be removed. The suction catheter 10 is preferably tubular and extends into the blood vessel 71. The suction port 103 can also be connected to a drug delivery device, which can deliver drugs into the suction chamber 101 so that the drugs enter the blood vessel 71 through the suction port 102 to achieve a therapeutic effect. The support and removal member 20 can move and bend along with the suction catheter 10 within the blood vessel 71. In this case, the support and removal member 20 can increase the support force for the movement of the suction catheter in the blood vessel 71. The support and removal member 20 can also be inserted into the suction chamber 101 and reach the suction port 102 after the suction catheter 10 reaches the lesion site. The removal operation is achieved by the reciprocating movement of the support and removal member 20 between the distal and proximal ends. The reciprocating movement of the support and removal member 20 can be achieved manually by pulling or pushing, or by mechanical drive. The removal operation can be achieved by sawing the thrombus 72 horizontally from one side or the middle to achieve the detachment of the thrombus 72 from the blood vessel wall, or by continuously inserting and pulling out to crush the thrombus 72 to achieve the detachment of the thrombus 72 from the blood vessel wall. The proximal end of the suction catheter 10 is connected to the catheter seat 14, and the support removal member 20 is connected to the catheter seat 14. The catheter seat 14 is made of hard and transparent polycarbonate and is used to expand the suction port 103 of the suction cavity 101 into a bell mouth. Please refer to Figure 1 、 Figure 5 and Figure 6 Preferably, a stress relief tube 15 is connected between the catheter adapter 14 and the suction catheter 10 , and the stress relief tube 15 is made of elastic material. The support removal member 20 is connected to the suction catheter 10 through a Luer connector 16 .

[0040] The aspirator 60 is connected to the aspiration catheter 10 and is used to generate negative pressure in the aspiration chamber 101. The aspiration port 102 is used to aspirate the thrombus 72 by the negative pressure in the aspiration chamber 101. When the aspirator 60 is aspirating, the aspiration catheter 10 is operated to cause the aspiration port 102 to reciprocate between the proximal and distal ends of the lesion to ensure that the thrombus 72 in the lesion is aspirated completely, thereby achieving a therapeutic effect.

[0041] See also Figure 2 and Figure 3The suction catheter 10 of the suction device of the embodiment of the present invention can extend in the blood vessel 71. After the suction catheter 10 moves to the lesion site and the suction port 102 is aligned with the thrombus 72, the support and removal member 20 can remove the thrombus 72 by protruding out of the suction port 102, so that the thrombus 72 is cut off or broken from the wall of the blood vessel 71, and the thrombus 72 is able to fall off from the wall of the blood vessel 71 and break into small pieces. At this time, the aspirator 60 performs a suction operation on the suction chamber 101 to generate negative pressure in the suction chamber 101. The thrombus 72 is sucked into the suction chamber 101 under the action of the negative pressure and is extracted. The setting of the support and removal member 20 enables larger thrombi 72 to be sawed into small pieces and then sucked into the suction chamber 101 from the suction port 102, thereby improving the suction efficiency and enabling the thrombus 72 to be cleaned up in the blood vessel 71. Before the vacuum device performs the suction operation on the suction chamber 101 , the support removal member 20 can be removed from the suction chamber 101 to increase the space available in the suction chamber 101 , thereby improving the suction efficiency of the thrombus 72 .

[0042] Please refer to Figure 7 Furthermore, the support and removal member 20 includes a removal assembly 21 that passes through the suction chamber 101 and a controller 22 connected to the proximal end of the removal assembly 21. The controller 22 is used to control the removal assembly 21 to perform the removal operation and has a control state that restricts the movement of the removal assembly 21 and an unlocked state that releases the restriction on the removal assembly 21. The support and removal member 20 achieves the reciprocating motion of the removal assembly 21 through the controller 22. The controller 22 is connected to the suction catheter 10. This ensures that the position of the suction catheter 10 in the suction chamber 101 is relatively fixed when the controller 22 is in the control state, preventing the support and removal member 20 from shaking in the suction chamber 101, which ultimately affects the suction effect.

[0043] See also Figure 2 、 Figure 3 and Figure 7 Furthermore, the removal assembly 21 includes a support rod 211 connected to the controller 22 and a screw 212 connected to the distal end of the support rod 211 and used to remove the thrombus 72. The user can rotate the screw 212 to make it easier to insert the screw 212 into the thrombus 72, thereby preventing the thrombus 72 from moving and becoming difficult to insert into the thrombus 72. The screw 212 can be slidably connected or transferably connected to the support rod 211. When the user rotates the screw 212, the support rod 211 does not rotate, or when the user operates the screw 212 to reciprocate, the support rod 211 does not move. The screw 212 can also be fixedly connected to the support rod 211, and the operator controls the movement of the screw 212 by operating the support rod 211.

[0044] Please refer to Figure 9aIn one embodiment, the screw member 212 is provided with a spiral groove 2121 in its circumference. The spiral groove 2121 acts as a screw thread. The user rotates the screw member 212 so that the screw member 212 is screwed into the thrombus 72, and then pulls back the screw member 212. At this time, the spiral groove 2121 increases the friction force on the surface of the screw member 212, and the thrombus 72 partially trapped in the spiral groove 2121 is brought out to achieve the crushing function.

[0045] Please refer to Figure 9b In another embodiment, the removal assembly 21 further includes a threaded member 213 circumferentially helically projecting from the screw member 212. The threaded member 213 rotates as the screw member 212 rotates. In this case, the removal assembly 21 acts as a screw. When the screw member 212 penetrates the thrombus 72, the threaded member 213 can cut through and remove the thrombus 72 around the screw member 212, thereby achieving a better crushing effect than the spiral groove 2121. The threaded member 213 can be a spring, that is, the screw member 212 is inserted into the spring to facilitate assembly.

[0046] In another embodiment, the screw member 212 has retractable elasticity, wherein when the controller 22 is in a control state, the screw member 212 is compressed and in a contracted state with an elastic restoring force, and when the controller 22 is in an unlocked state, the screw member 212 is in a released state in which the elastic restoring force is released so that its distal end reciprocates under the action of the elastic restoring force. When the screw member 212 is in a compressed state, its distal end is located at the extraction port 102, and when it is in a released state, its distal end can protrude out of the extraction port 102 and remove the thrombus 72 through reciprocating motion. When the controller 22 switches from the control state to the unlocked state, the external force on the screw member 212 is removed and the screw member 212 extends under the action of its own elastic restoring force, that is, its distal end protrudes out of the extraction port 102 and moves toward the thrombus 72 to rub against the thrombus 72. The distal end of the screw member 212 is preferably connected to a sawing head for bearing weight. During the movement toward the distal end, the sawing head stretches the screw member 212 due to the action of the inertia of the movement, so that it has an elastic restoring force toward the proximal end. Under the action of this elastic restoring force toward the proximal end, the sawing head retracts to a compressed state, thereby achieving a reciprocating motion of the screw member 212. The removal assembly 21 performs the removal operation by a plurality of reciprocating motions. During the removal operation of the removal assembly 21, the sawing head rubs against the thrombus 72, causing the thrombus 72 to fall off the wall of the blood vessel 71. The support rod 211 is made of stainless steel to improve the support and pushing ability of the catheter. The screw member 212 can be optionally a coil spring. The coil spring can prevent the distal end of the suction catheter 10 from being folded when passing through a tortuous blood vessel 71 .

[0047] The suction device further includes an extension catheter connected to the proximal end of the suction catheter 10 and a switch valve provided on the extension catheter.

[0048] In one embodiment, the extension catheter is connected to the suction catheter 10 at its distal end and communicates with the suction port 103, and is communicated with the aspirator 60 at its proximal end. The switch valve has an open state for connecting the suction chamber 101 with the aspirator 60 and a closed state for disconnecting the suction chamber 101 from the suction chamber 101. The extension catheter facilitates the user to operate the aspirator 60 without being affected by the use environment of the suction port 103. When the support removal member 20 completes the removal operation, the user switches the switch valve to the open state, at which time the aspirator 60 can perform a suction operation on the suction chamber 101. When the suction operation is completed, the user switches the switch valve to the closed state to disconnect the aspirator 60 from the suction operation.

[0049] In another embodiment, the aspiration chamber 101 includes at least a first circulation chamber formed by the outer wall of the removal assembly 21 and the inner wall of the aspiration chamber 101, and a second circulation chamber disposed within the removal assembly 21. The removal assembly 21 defines a second communication port connected to the proximal end of the second circulation chamber, and a first communication port connected to the second circulation chamber and spaced apart from the second communication port. The aspirator 60 is connected to the removal assembly 21 and communicates with the second communication port. In this embodiment, the removal assembly 21 can perform aspiration operations simultaneously with the aspiration catheter 10, thereby improving the efficiency of aspirating the thrombus 72. The extension tube is connected to both the aspiration port 103 and the communication port at its distal end, and to the aspirator 60 at its proximal end. The on-off valve connects the aspiration chamber 101 to the aspirator 60 when open, and disconnects the aspiration chamber 101 from the aspirator 60 when closed. When the support removal member 20 completes the removal operation, the user switches the switch valve to the open state, and the aspirator 60 is able to perform suction operations on the first flow chamber and the second flow chamber at the same time. When the suction operation is completed, the user switches the switch valve to the closed state to disconnect the aspirator 60 from the suction operations on the first flow chamber and the second flow chamber.

[0050] In this embodiment, preferably, the removal component 21 can perform suction operation simultaneously with the removal operation, so as to suction the broken blood clots produced in the process of sawing the thrombus 72 in advance, so as to avoid the blood clots being dispersed during the removal operation and the subsequent suction process of the suction catheter 10 being unable to remove the blood clots completely.

[0051] In another embodiment, please refer to Figure 1The extension tube 40 is connected to the support and removal member 20. The extension tube 40 is connected to the second communication port at its distal end and to the aspirator 60 at its proximal end. The switch valve 50 connects the second flow cavity to the aspirator 60 when it is open, and disconnects the aspiration cavity 101 from the second communication cavity when it is closed. When the support and removal member 20 is performing a removal operation, the user switches the switch valve 50 to the open state. At this time, the aspirator 60 can perform a suction operation on the second flow cavity during the sawing of the thrombus 72. When the removal operation is completed, the support and removal member 20 is withdrawn and the extension tube is connected to the aspiration catheter 10 so that the extension tube is connected to the aspiration cavity 101. The user switches the switch valve 50 to the closed state to disconnect the aspiration cavity 101 from the aspiration operation of the aspirator 60.

[0052] Preferably, see Figure 7 The diameter of the support rod 211 gradually increases from the distal end to the proximal end, so that the proximal end of the support rod 211 is harder, and can provide better support force for the suction catheter 10 when the support removal member 20 and the suction catheter 10 are simultaneously extended into the blood vessel 71, and its distal end is softer, so that it can bend and deform to adapt to the direction of the blood vessel 71.

[0053] Please refer to Figures 1 to 6Furthermore, the suction catheter 10 includes a tubular suction portion 12, a tubular guide portion 11 located at the distal end of the suction portion 12 and having an outer diameter smaller than that of the suction portion 12, and a connecting portion 13 for connecting the distal end of the suction portion 12 with the proximal end of the guide portion 11. Thus, the suction catheter 10 also has a guide lumen 111, which is isolated from the suction lumen 101 and is used to pass the guide wire 80, and a penetration port 112, which is connected to the proximal end of the guide lumen 111 and is used for the guide wire 80 to pass through the guide lumen 111. The suction lumen 101 is provided in the suction portion 12, and the guide lumen 111 is provided in the guide portion 11. The guide lumen 111 and the suction lumen 101 are overlapped in the extension direction of the suction catheter 10 and are offset in a direction perpendicular to the extension direction of the suction catheter 10. The penetration port 112 is preferably opened on the side wall of the guide portion 11, in which case the guide lumen 111 is L-shaped. The existing guide lumen 111 is usually arranged on one side of the radial direction of the suction lumen 101 to facilitate the insertion of the guide wire 80 and drive the suction catheter 10 to move in the blood vessel 71. However, this will increase the overall outer diameter of the suction catheter 10. If the overall outer diameter of the suction catheter 10 is to be reduced so that it can pass through the thinner blood vessel 71, it can only be achieved by reducing the inner diameter of the suction lumen 101. However, this will reduce the amount of blood clots 72 aspirated, affecting the aspiration effect. The present invention sets the guide lumen 111 at the distal end of the suction lumen 101. After the guide wire 80 is inserted into the guide lumen 111, the movement of the tip of the guide suction catheter 10 is driven to move the suction portion 12 in the blood vessel 71. In this way, the overall outer diameter of the suction catheter 10 can be reduced without reducing the inner diameter of the suction lumen 101 to accommodate the need to pass through the thinner blood vessel 71. The distal end of the guide wire 80 is bent to adapt to the L-shaped direction of the guide lumen 111.

[0054] The suction port 102 may be optionally provided on the side wall of the suction portion 12, so that when the thrombus 72 is small and adheres to the inner wall of the blood vessel 71, the suction catheter 10 can pass through the blood vessel 71 so that the suction port 102 directly faces the thrombus 72 for suction, or when the thrombus 72 is large, the suction catheter 10 can be inserted into and pass through the thrombus 72 so that the suction port 102 enters the lesion site for suction. Figure 6 The connection between the suction portion 12 and the guide portion 11 forms a stepped structure with an oblique surface 104. The suction port 102 is located on the oblique surface 104. The oblique surface 104 increases the area of ​​the suction port 102, thereby increasing the suction area and amount of the thrombus 72. The oblique surface 104 also allows the suction port 102 to face both the distal end and the inner wall of the blood vessel 71. This allows the suction port 102 to be aligned with the thrombus 72 regardless of its size, simplifying the operation and improving the suction effect. Furthermore, the oblique surface 104 guides the passage of the suction portion 12.

[0055] Optionally, the central axis of the suction portion 12 coincides with the central axis of the guide portion 11, allowing the guide portion 11 to move within the middle of the blood vessel 71 and prevent thrombus 72 on the inner wall of the blood vessel 71 from obstructing the movement of the suction catheter 10. Alternatively, the guide portion 11 can be located at the distal edge of the suction portion 12, i.e., the sidewall surface of at least one side of the guide portion 11 is flush with the sidewall surface of the suction portion 12 on that side. This allows the operator to rotate the suction catheter 10 to cause the guide portion 11 to rotate within the blood vessel 71, avoiding thrombus 72 accumulated on one side of the inner wall of the blood vessel 71 and passing through the gap on the opposite side. Preferably, the penetration port 112 and the suction port 102 are located on either side of the connecting portion 13.

[0056] Please refer to Figures 1 to 6 Marker ring 30 can be made of a metal material with poor X-ray transparency, allowing the user to locate the aspirated blood vessel 71 or determine its status by observing its position. Marker ring 30 can be made of gold, platinum, tantalum, tungsten, or a polymer material doped with another metal with poor X-ray transparency, such as barium sulfate or bismuth oxide. In embodiments of the present invention, marker ring 30 can be positioned on guide portion 11 to mark the travel status and orientation of the tip of aspiration catheter 10, on aspiration portion 12 to indicate the specific layout of aspiration catheter 10, or on support and removal member 20 to indicate the status of the removal operation.

[0057] Please refer to Figure 6 Preferably, the softness of the suction catheter 10 gradually decreases from the distal end to the proximal end, that is, the distal end of the suction catheter 10 is softer so as to facilitate bending and deformation to adapt to the complex direction of the blood vessel 71, and the distal end is harder so as to provide greater support force to promote the movement of the distal end. In this embodiment, the suction cavity 101 includes an inner layer 123, a middle layer 121 and an outer layer 122 from the inside to the outside, wherein the inner layer 123 is made of one or more smooth materials such as polytetrafluoroethylene, polyetherketone or high-density polyethylene to facilitate blood circulation. The middle layer 121 is composed of a metal spring, a braided structure or a metal sawn sea wave tube, so that the softness of the suction catheter 10 can be adjusted by setting its structural density. The greater the structural density, the greater the deformability, that is, the greater the softness, and the smaller the structural density, the greater the deformability, that is, the greater the hardness, wherein, please refer to Figure 8a The metal spring consists of 1 to 18 wires, and its density gradually decreases from the distal end to the proximal end. Please refer to Figure 8b The braided structure is made of 16-strand flat wire or 32-strand round wire in a two-fold manner. The braiding density gradually becomes sparse from the distal end to the proximal end. Please refer to Figure 8cThe hypotube is a metal sawn hypotube, with the sawing density gradually decreasing from the distal end to the proximal end. The outer layer 122 can be made of one or more of polyamide, polyurethane, or polyolefin materials of varying hardness. Through process formulation, the flexibility of the outer layer 122 is gradually reduced from the distal end to the proximal end. Preferably, the outer layer 122 has multiple sections of variable diameter, and the outer diameter of the suction catheter 10 gradually increases from the distal end to the proximal end. In this way, the suction catheter 10 can improve the flexibility of its distal end, thereby improving its ability to pass through the curved blood vessel 71, and improve the pushing ability of the proximal end.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A suction device, characterized in that: include: A suction catheter having a suction cavity, a suction port connected to the proximal end of the suction cavity, and a suction port connected to the distal end of the suction cavity; a support and removal member, located in the suction cavity and capable of bending together with the suction catheter, and capable of protruding from the suction port, and capable of removing the thrombus after protruding from the suction port; The support and removal member includes a removal component that passes through the suction chamber and a controller connected to the proximal end of the removal component. The controller is used to control the removal component to perform a removal operation and has a control state that restricts the movement of the removal component and an unlocked state that releases the restriction on the removal component. The removal component includes a support rod connected to the controller and a screw connected to the distal end of the support rod and used to remove the thrombus. When the controller is in the unlocked state, the screw can protrude from the suction port and remove the thrombus through reciprocating motion. The screw member has retractable elasticity, wherein when the controller is in the control state, the screw member is compressed and in a contracted state with elastic restoring force, and when the controller is in the unlocked state, the screw member is in a released state in which the elastic restoring force is released so that the distal end thereof reciprocates under the action of the elastic restoring force. When the screw member is in the compressed state, the distal end thereof is located at the extraction port, and when the screw member is in the released state, the distal end thereof can protrude from the extraction port and remove the thrombus by reciprocating motion. An aspirator is used to generate negative pressure in the aspiration chamber. The aspirator is connected to the aspiration catheter, or the aspirator is connected to the support removal member and communicates with the aspiration chamber through the support removal member. The aspiration inlet is used to aspirate thrombus through the negative pressure of the aspiration chamber.

2. The suction device according to claim 1, wherein The screwing member is provided with a spiral groove in its circumference.

3. The suction device according to claim 1, wherein The removal assembly further includes a screw connection member circumferentially spirally protruding from the screw member.

4. The suction device according to claim 1, wherein The rod diameter of the support rod gradually increases from the distal end to the proximal end.

5. The suction device according to claim 1, wherein The suction device further comprises an extension tube connected to the proximal end of the suction tube. The distal end of the extension tube is in communication with the extraction port, and the proximal end of the extension tube is in communication with the aspirator.

6. The suction device according to claim 1, wherein The suction catheter also has a guide cavity isolated from the suction cavity and used for passing a guide wire, and an entry port connected to the proximal end of the guide cavity and used for allowing the guide wire to pass through the guide cavity. The guide cavity and the suction cavity are overlapped in the extension direction of the suction catheter and are staggered in a direction perpendicular to the extension direction of the suction catheter.

7. The suction device according to claim 6, characterized in that The suction catheter includes a tubular suction portion, a tubular guide portion located at the distal end of the suction portion and having an outer diameter smaller than the outer diameter of the suction portion, and a connecting portion for connecting the distal end of the suction portion with the proximal end of the guide portion. The suction cavity is provided in the suction portion, the guide cavity is provided in the guide portion, a step structure is formed at the connection between the suction portion and the connecting portion, the step structure has an oblique surface, the suction inlet is opened on the oblique surface, the central axis of the suction portion and the guide portion are parallel to or coincide with each other, and the penetration port and the suction inlet are located on both sides of the connecting portion.

8. The suction device according to claim 1, wherein The suction catheter has at least a tubular middle layer, an outer layer covering the outside of the middle layer, and a tubular inner layer arranged inside the middle layer. The middle layer is one or more of a spring tube, a braided tube or a sea wave tube. The density of the middle layer gradually decreases from the distal end to the proximal end. The inner layer surrounds the suction cavity and has a smooth inner wall surface.

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