An aspiration catheter

Abstract

The application provides a suction catheter, which comprises a catheter, a handle connected to a proximal end of the catheter, and a head end connected to a distal end of the catheter, wherein the head end comprises a protective cover and a rotary grinding head arranged inside the protective cover. A cable is arranged in the catheter, extends to a distal end of the head end, and is fixedly connected with the rotary grinding head, and the protective cover is provided with a hollow structure. The cable is configured to drive the rotary grinding head to rotate and break a thrombus entering the protective cover. In the technical scheme, the catheter can be inserted into a blood vessel of a human body, and the handle is used for holding by an operator. The hollow structure of the protective cover allows the thrombus to pass through, and then the rotary grinding head driven to rotate by the cable breaks the thrombus. The size of the thrombus broken by the rotary grinding head is small, so that the broken thrombus is not easy to be blocked when being sucked out, and the rotary grinding head is arranged in the protective cover, so that the blood vessel is not easy to be damaged.

Description

TECHNICAL FIELD

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

[0002] Deep venous thrombosis (DVT) is a disease caused by abnormal coagulation of blood in the deep veins of the lower limbs. Due to the obstruction of blood return, patients may exhibit conditions such as swelling, pain, and dysfunction of the lower limbs. Once the thrombus is detached, it may cause pulmonary embolism (PE), causing impaired gas exchange, leading to pulmonary hypertension and right heart dysfunction. In severe cases, patients may experience difficulty breathing, shock, and even death. DVT can be treated surgically, and thrombectomy surgery mainly uses thrombectomy stents and aspiration catheters. Compared with the use of thrombectomy stents, the use of aspiration catheters has shorter operation time, simpler operation, lower cost, and can avoid secondary thrombus detachment, so it has good application prospects.

[0003] The existing aspiration catheter has the following problems: 1. Catheter easy to block: when dealing with large or high consistency thrombus in the blood vessel, the thrombus is easy to block the distal opening of the catheter, which leads to ineffective aspiration of the thrombus, affects the treatment effect, and increases the risk of operation; the inside of the catheter is blocked; in addition to the distal opening, the inside of the catheter may also be blocked due to the high consistency or complex composition of the thrombus. 2. Injury during operation: during the use of negative pressure aspiration catheter, improper operation or instability of the catheter during operation may cause the catheter to move or rotate in the blood vessel and damage the blood vessel wall. SUMMARY

[0004] The purpose of the present application is to provide an aspiration catheter to improve the problems of thrombus blocking the aspiration catheter and the aspiration catheter damaging the blood vessel.

[0005] Embodiments of the present application are implemented as follows:

[0006] In a first aspect, the embodiments of the present application provide an aspiration catheter, comprising a catheter, a handle connected to the proximal end of the catheter, and a head end connected to the distal end of the catheter, the head end comprising a protective cover and a rotary grinding head arranged inside the protective cover.

[0007] A cable is arranged in the catheter, the cable extends to the distal end of the head end and is fixedly connected with the rotary grinding head, and the protective cover is provided with a hollow structure.

[0008] The cable is configured to drive the rotary grinding head to rotate and break the thrombus entering the protective cover.

[0009] In the technical solution, the catheter can be inserted into the blood vessel of the human body, and the handle is used for the operator to hold. The hollow structure of the protective cover allows the thrombus to pass through, and then the rotary abrasive head driven by the cable breaks the thrombus. The size of the thrombus broken by the rotary abrasive head is small, and the thrombus is not easy to be blocked when being sucked out. Since the rotary abrasive head is arranged in the protective cover, the blood vessel is not easy to be damaged. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0011] Figure 1 A schematic diagram of the suction catheter provided by an embodiment of the present application is shown in the figure.

[0012] Figure 2 A schematic diagram of the head end of the suction catheter provided by an embodiment of the present application is shown in the figure.

[0013] Figure 3 A schematic diagram of the head end of the suction catheter provided by an embodiment of the present application is shown in the figure.

[0014] Figure 4 A schematic diagram of the rotary abrasive head provided by an embodiment of the present application is shown in the figure.

[0015] Figure 5 A schematic diagram of the rotary abrasive head provided by an embodiment of the present application is shown in the figure.

[0016] Figure 6 A schematic diagram of the rotary abrasive head provided by an embodiment of the present application is shown in the figure. Figure 5 A schematic diagram of the rotary abrasive head provided by an embodiment of the present application is shown in the figure.

[0017] Figure 7 A schematic diagram of the rotary abrasive head provided by an embodiment of the present application is shown in the figure.

[0018] Figure 8 A schematic diagram of the rotary abrasive head provided by an embodiment of the present application is shown in the figure. Figure 7 A schematic diagram of the rotary abrasive head provided by an embodiment of the present application is shown in the figure.

[0019] Figure 9 A schematic diagram of the rotary abrasive head provided by an embodiment of the present application is shown in the figure.

[0020] Figure 10 A schematic diagram of the rotary abrasive head provided by an embodiment of the present application is shown in the figure. Figure 9 A schematic diagram of the rotary abrasive head provided by an embodiment of the present application is shown in the figure.

[0021] Figure 11 This is a schematic diagram of the layer structure of the cable provided in an embodiment of this application;

[0022] Figure 12 A schematic diagram of the layered structure of the distal end of the catheter provided in an embodiment of this application;

[0023] Figure 13 A schematic diagram of the outer reinforcing layer of the sodium hypochlorite tube structure;

[0024] Figure 14 This is a schematic diagram of the internal structure of the handle provided in an embodiment of this application;

[0025] Figure 15 An exploded view of the handle in the screw mechanism mounting position provided in an embodiment of this application.

[0026] Icons: 01-Head end; 02-Conduit; 021-Main branch; 022-Side branch; 03-Handle; 04-Protective cover; 05-Grinding head; 50-Cut blade; 050-Connecting part; 051-First cutting blade; 052-Second cutting blade; 053-Third cutting blade; 054-Fourth cutting blade; 501-Horizontal cutting part; 502-Vertical cutting part; 06-Cable; 061-Third metal layer; 062-Second metal layer; 063-First metal layer; 07-Developing ring; 08-Control wire; 09-Inner reinforcing layer; 10-Intermediate reinforcing layer; 11-Outer reinforcing layer; 12-Outer tube; 121-Side hole; 13-Outer shell; 131-Luer interface; 14-Adjusting push-torque; 15-Screw mechanism; 16-Bearing; 17-Inner liner; 18-Small bearing. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0029] This application provides a suction catheter, such as Figure 1 As shown, it includes a catheter 02, with a handle 03 connected to the proximal end and a tip 01 connected to the distal end. Figure 2As shown, the tip 01 includes a protective cover 04 and a rotary burr head 05 disposed inside the protective cover 04. In this application, the proximal and distal ends are determined based on their distance from the handle 03. In the same structure, the end closer to the handle 03 is the proximal end, and the end farther from the handle 03 is the distal end. A cable 06 is disposed inside the catheter 02, extending to the distal end of the tip 01 and fixedly connected to the rotary burr head 05, thus the cable 06 can drive the rotary burr head 05 to rotate. The protective cover 04 is provided with a perforated structure to allow thrombi to pass through. After the thrombus enters the protective cover 04 through the perforated structure, it can be broken up by the rotary burr head 05. Furthermore, the perforated structure on the protective cover 04 is arranged along the circumferential direction of the catheter 02. The aspiration catheter provided in this application has the function of breaking up thrombi, which makes it easier to remove thrombi. Since the rotary burr head 05 connected to the distal end of the catheter 02 is also provided with a protective cover 04, the rotary burr head 05 is less likely to cause damage to blood vessels.

[0030] Furthermore, the cable 06 and the protective cover 04 are structurally locked, allowing the cable 06 to rotate within the protective cover 04 but preventing it from moving back and forth. The grinding head 05 is fixed around the cable 06 and cannot move relative to it; the cable 06 drives the grinding head 05 to rotate coaxially within the protective cover 04. For example, in some optional embodiments, the cable 06 and the protective cover 04 are connected by a bearing; specifically, the cable 06 is connected to the inner ring of the bearing, and the protective cover 04 is connected to the outer ring of the bearing.

[0031] In some implementations, such as Figure 3 and Figure 4 As shown, the cauterization head 05 has cutting blades 50. During the rotation of the cauterization head 05 with the cable 06, the blades can break up the thrombus. Furthermore, the cauterization head 05 has M cutting blades 50, arranged along the circumference of the catheter 02; where M is a positive integer greater than or equal to 2, so that the cable 06 can break up the thrombus at least twice per revolution. Optionally, Figure 3 and Figure 4 The number of cutting blades 50 shown is M = 4. Figure 4 The cutting blade 50 is shown to include a first cutting blade 051, a second cutting blade 052, a third cutting blade 053, and a fourth cutting blade 054. Of course, M can also be a positive integer such as 2, 3, 5, or 6. In embodiments where the number of cutting blades 50 is two or more, the cutting blades 50 are preferably evenly distributed in the circumferential direction of the guide tube 02 to reduce the wobbling of the swirl head 05 during rotation.

[0032] For further details, please continue to see [link / reference]. Figure 3The cutting blade 50 includes a horizontal cutting portion 501 extending along the axial direction of the catheter 02 and a vertical cutting portion 502 extending along the radial direction of the catheter 02. The axial direction of the catheter 02 is the axial direction when the catheter 02 is straight, and the radial direction of the catheter 02 is perpendicular to the axial direction of the catheter 02. One end of the vertical cutting portion 502 is fixedly connected to the proximal end of the horizontal cutting portion 501, and the other end of the vertical cutting portion 502 is fixedly connected to the cable 06. That is, the end of the horizontal cutting portion 501 near the handle 03 is connected to the cable 06 through the vertical cutting portion 502. During the rotation of the cauterization head 05, both the horizontal cutting portion 501 and the vertical cutting portion 502 can achieve the function of breaking up thrombi. In other embodiments, the horizontal cutting portion 501 may not be parallel to the axial direction of the catheter 02, and the vertical cutting portion 502 may not extend along the radial direction of the catheter body.

[0033] In one alternative embodiment, please continue to see Figure 3 At least two horizontal cut sections 501 have unequal lengths along the axial direction of the conduit 02, such as... Figure 3 As shown, the cutting blade 50 includes a first cutting blade 051 and a second cutting blade 052. The lengths of the horizontal cutting portions 501 of the first cutting blade 051 and the horizontal cutting portions 501 of the second cutting blade 052 are not equal. Specifically, the first cutting blade 051 and the second cutting blade 052 are flush on the distal side and not flush on the proximal side. That is, the lengths of the horizontal cutting portions 501 of at least two cutting blades 50 along the axial direction of the catheter 02 are not equal, so that the cauterization head 05 can break up thrombi of different sizes.

[0034] In another alternative embodiment, such as Figure 4 As shown, at least two vertical cut portions 502 have unequal lengths along the radial direction of the conduit 02, such as... Figure 4 As shown, the lengths of the vertical cutting portion 502 of the first cutting blade 051 and the vertical cutting portion 502 of the second cutting blade 052 are not equal; that is, the rotation radii of the first cutting blade 051 and the second cutting blade 052 along the cable 06 are different, which also enables the calcining head 05 to break up thrombi of different sizes.

[0035] In one alternative embodiment of this application, such as Figure 5 , Figure 7 as well as Figure 9 As shown, the rotary grinding head 05 also includes a connecting part 050. The distal ends of the horizontal cutting parts 501 are all connected to the connecting part 050. Since the distal ends of the horizontal cutting parts 501 are all connected to the connecting part 050, the distal ends of the horizontal cutting parts 501 are flush, that is, the distal ends of all the cutting blades 50 are in the same position in the axial direction of the guide tube 02.

[0036] Optional,Figure 5 , Figure 7 as well as Figure 9 As shown, the connecting part 050 includes a hemispherical shell structure 50a so that the connecting part 050 can rotate together with the cable 06.

[0037] Optional, such as Figure 5 and Figure 9 As shown, the connecting part 050 includes a strip structure 50b that connects to the shell structure 50a; one end of the strip structure 50b is connected to the shell structure 50a, and the other end extends in a direction perpendicular to the cable 06 and is connected to the distal end of the horizontal cutting part 501; the arrangement of the strip structure 50b means that the distal end of the horizontal cutting part 501 is recessed in the direction of the cable 06, thus preventing the horizontal cutting part 501 from rotating and cutting the thrombus and hitting the protective cover 04.

[0038] Optional, please continue to see Figure 7 as well as Figure 9 The distal ends of the M horizontal cutting sections 501 are flush (e.g., the distal ends of the horizontal cutting sections 501 of all cutting blades 50 are connected to the connecting section 050). The vertical cutting sections 502 connected to the M horizontal cutting sections 501 are connected to different positions on the cable 06. That is, the lengths of all horizontal cutting sections 501 in the axial direction of the catheter 02 are not the same, which means that all the corresponding vertical cutting sections 502 are not on the same plane. The M vertical cutting sections 502 correspond to M planes perpendicular to the cable 06. Therefore, when the cauterization head 05 rotates, the thrombus in the suction catheter 02 can be broken by the M vertical cutting sections 502 at M plane positions in the axial direction of the catheter 02, forming the effect of M consecutive thrombus breaking. Therefore, the function of strengthening thrombus breaking is achieved by breaking the thrombus multiple times in the axial direction.

[0039] In one alternative embodiment, such as Figure 9 As shown, in embodiments where the lengths of the horizontal cutting portions 501 in the axial direction of the catheter 02 are different, the distal ends of the horizontal cutting portions 501 are flush, and the distance d1 between any two adjacent vertical cutting portions 502 in the axial direction of the cable 06 is equal; correspondingly, the size of the thrombus that each cutting blade 50 can break in the axial direction of the cable 06 gradually increases.

[0040] In another alternative embodiment, such as Figure 9 As shown, in embodiments where the distal ends of the horizontal cutting portions 501 are flush and the lengths of the horizontal cutting portions 501 in the axial direction of the conduit 02 are different, the spacing d2 between two opposing vertical cutting portions 502 in the circumferential direction of the conduit 02 along the axial direction of the conduit 02 can also be equal.

[0041] For example, a first vertical cutting section 502, a second vertical cutting section 502, a third vertical cutting section 502, and a fourth vertical cutting section 502 are sequentially distributed along the circumference of the conduit 02; wherein, the first vertical cutting section 502 and the third vertical cutting section 502 are arranged opposite to each other, and the second vertical cutting section 502 and the fourth vertical cutting section 502 are arranged opposite to each other; the distance between the first vertical cutting section 502 and the second vertical cutting section 502 along the axial direction of the conduit 02 is d1, the distance between the second vertical cutting section 502 and the third vertical cutting section 502 along the axial direction of the conduit 02 is d1, and the distance between the third vertical cutting section 502 and the fourth vertical cutting section 502 along the axial direction of the conduit 02 is d2; where d2 = 2d1.

[0042] In some embodiments, the spacing between any two adjacent vertical cut portions 502 along the axial direction of the cable 06 may be equal, and the spacing between two opposite vertical cut portions 502 along the axial direction of the conduit 02 may also be equal.

[0043] In one optional embodiment of this application, such as Figure 6 and Figure 10 As shown, the swirl head 05 includes multiple cutting blades 50, and the vertical cutting portions 502 of at least two cutting blades 50 have unequal lengths along the radial direction of the guide tube 02 (e.g., Figure 10 As shown, L2 > L1); In some embodiments, the lengths of the vertical cutting portions 502 of all the cutting blades 50 along the radial direction of the conduit 02 are not equal. That is, one end of each of the M vertical cutting portions 502 is fixedly connected to the cable 06, and the other end is at a different distance from the cable 06. Correspondingly, the distances of the horizontal cutting portions 501 connected to the vertical cutting portions 502 from the cable 06 are also different. Thus, the M cutting blades 50 have M horizontal cutting portions 501 forming M rotating surfaces. The thrombus in the suction conduit 02 can be broken by the M horizontal cutting portions 501 on the M rotating surfaces, forming the effect of breaking the thrombus M times in succession, so as to achieve the breaking of thrombi of more sizes.

[0044] Optional, such as Figure 6 and Figure 10 As shown, the lengths of the vertical cut portions 502 increase at equal intervals, meaning the lengths of all the vertical cut portions 502 can form an arithmetic sequence. Optionally, the lengths of the vertical cut portions 502 increase sequentially at equal intervals along the circumferential direction of the guide tube 02. Specifically, refer to... Figure 10The lengths of the vertical cutting portions 502 are L1, L2, L3, and L4, respectively, wherein L4-L3 = L3-L2 = L2-L1. In other embodiments, the lengths of the vertical cutting portions 502 may be set according to other rules or irregularly.

[0045] Optionally, the spacing between two opposite vertical cut portions 502 in the circumferential direction of the conduit 02 along the axial direction of the conduit 02 is equal.

[0046] In one embodiment of this application, the lengths of the horizontal cutting portion 501 and the vertical cutting portion 502 of the cutting blade 50 are set so that they do not affect each other. In an optional embodiment, such as... Figure 5 and Figure 6 As shown, the horizontal cutting portions 501 of the four cutting blades 50 in the cauterization head 05 have equal lengths along the axial direction of the catheter 02, but the vertical cutting portions 502 of the cutting blades 50 have unequal lengths along the radial direction of the catheter 02. Thus, the M cutting blades 50 have M horizontal cutting portions 501 forming M rotating surfaces. The thrombus drawn into the catheter 02 can be broken up by the M horizontal cutting portions 501 on the M rotating surfaces, achieving the effect of M consecutive thrombus fragmentation.

[0047] In another optional embodiment of this application, such as Figure 7 and Figure 8 As shown, the horizontal cutting portions 501 of the four cutting blades 50 in the cauterization head 05 are not equal in length along the axial direction of the conduit 02, but the vertical cutting portions 502 of the cutting blades 50 are equal in length along the radial direction of the conduit 02. This means that all the corresponding vertical cutting portions 502 are not on the same plane. The M vertical cutting portions 502 correspond to M planes perpendicular to the cable 06. Therefore, when the cauterization head 05 rotates, the thrombus drawn into the conduit 02 can be broken up by the M vertical cutting portions 502 at M plane positions along the axial direction of the conduit 02, forming an effect of M consecutive thrombus fragmentation. Thus, the function of enhanced thrombus fragmentation is achieved by multiple fragmentation in the axial direction.

[0048] In another optional embodiment of this application, such as Figure 9 and Figure 10 As shown, the horizontal cutting portions 501 of the four cutting blades 50 in the cauterization head 05 are all of unequal length along the axial direction of the conduit 02, and the vertical cutting portions 502 of the cutting blades 50 are all of unequal length along the radial direction of the conduit 02. Thus, the thrombus aspirated into the conduit 02 can be broken up either by the M horizontal cutting portions 501 on the M rotating surfaces, resulting in the effect of M consecutive thrombus fragmentation, or by the M vertical cutting portions 502, resulting in the effect of M consecutive thrombus fragmentation.

[0049] In some implementations, such asFigure 5 , Figure 7 and Figure 9 As shown, the horizontal cutting section 501 has a cutting surface T, and at least one side of the cutting surface T in the circumferential direction of the catheter 02 has a cutting edge with a wavy, toothed structure. That is, the cutting surface T in the circumferential direction of the catheter 02 may have a cutting edge on one side, or both sides of the cutting surface T in the circumferential direction of the catheter 02 may have cutting edges. In the embodiment where both sides of the cutting surface T in the circumferential direction of the catheter 02 have cutting edges, the atherectomy head 05 can effectively break up the thrombus during both forward and reverse rotation. The wavy, toothed cutting edge has a pointed tip, which can better break up the thrombus during the rotation of the atherectomy head 05. In other embodiments, the cutting edge may also be of other shapes, such as a zigzag shape.

[0050] For example, such as Figure 9 , Figure 10 As shown, one cutting blade 50 is designated as the first cutting blade 051, and the other cutting blade 50 is designated as the second cutting blade 052. The length of the horizontal cutting portion 501 of the first cutting blade 051 is L11, the length of the horizontal cutting portion 501 of the second cutting blade 052 is L21, the length of the vertical cutting portion 502 of the first cutting blade 051 is L12, and the length of the vertical cutting portion 502 of the second cutting blade 052 is L22. Wherein, L11 > L21, and L12 > L22.

[0051] In the embodiments of this application, such as Figure 10 As shown, when the horizontal cutting section 501 of the cutting blade 50 is set to be longer, the vertical cutting section 502 is also set to be longer. This design makes the horizontal cutting section 501 connected to the vertical cutting section 502 the longest, such as when one of the cutting blades 051 (50) is set on the outermost layer; when the vertical cutting section 502 is the shortest, the horizontal cutting section 501 connected to it is also the shortest, such as when another cutting blade 052 (50) is set on the innermost layer. By reasonably matching and configuring the lengths of the vertical cutting section 502 and the horizontal cutting section 501, the rotating surfaces where multiple horizontal cutting sections 501 are located and the rotating planes where multiple vertical cutting sections 502 are located are fully utilized to break up the blood clots sucked into the calcining head 05 multiple times.

[0052] In some implementations, such as Figure 11As shown, the cable 06 includes a first metal layer 063 disposed on the outer layer and a second metal layer 062 disposed on the inner layer; the first metal layer 063 includes N1 first metal wires spirally wound in a first direction, and the second metal layer 062 includes N2 second metal wires spirally wound in a second direction, the first direction and the second direction being opposite. The cable 06 structure provided by this embodiment allows the cable 06 to maintain its flexibility and possess a large torque, enabling it to better drive the rotary atherectomy head 05 to rotate in tortuous blood vessels for more effective thrombus fragmentation.

[0053] In some implementations, N1 = N2, while in other implementations, N1 > N2.

[0054] Furthermore, in some embodiments, the diameter of the first metal wire is equal to the diameter of the second metal wire; in other embodiments, the diameter of the first metal wire may be greater than the diameter of the second metal wire.

[0055] Optionally, such as Figure 11 As shown, the cable 06 also includes a third metal layer 061 located inside the second metal layer 062. The third metal layer 061 contains a third metal wire, and the second metal wire is distributed circumferentially along the third metal wire. That is, the second metal wire in the second metal layer 062 is distributed circumferentially and surrounds the third metal wire inside. Further, in some embodiments, the diameter of the first metal wire can be equal to or larger than the diameter of the third metal wire. Optionally, the diameter of the third metal wire is equal to the diameter of the first metal wire to give the cable 06 better overall torque performance.

[0056] Optionally, when N1 = N2 or N1 < N2, the diameter of the first metal wire in the outer layer is larger than the diameter of the second metal wire in the inner layer, or when the diameter of the first metal wire in the outer layer is equal to the diameter of the second metal wire in the inner layer, N1 > N2, thus giving the cable 06 stronger torque performance.

[0057] Furthermore, the first, second, and third metal wires can be stainless steel structural components, nickel-titanium structural components, or tungsten structural components, and the materials of the first, second, and third metal wires can be the same or different.

[0058] In some implementations, such as Figure 12 , 14 and Figure 15As shown, the handle 03 includes a housing 13 and a bending adjustment knob 14 slidably connected to the housing 13; a developing ring 07 is provided at the distal end of the conduit 02, and a control wire 08 is provided inside the conduit 02. One end of the control wire 08 is fixedly connected to the developing ring 07, and the other end is fixed to the bending adjustment knob 14. Pushing the bending adjustment knob 14 pulls the control wire 08 to bend the distal end of the conduit 02 where the developing ring 07 is located.

[0059] Optionally, in some implementations, such as Figure 15 As shown, the proximal branch 022 of catheter 02 is provided with a Luer interface 131. The Luer interface 131 is connected to a negative pressure suction device to provide negative pressure to the space inside the protective cover 04, thereby realizing the thrombus suction function. Of course, in some other embodiments, the proximal branch 022 of catheter 02 may also adopt other types of interfaces; or the interface may be located at other positions of catheter 02.

[0060] Optionally, in some implementations, such as Figure 15 As shown, the handle 03 also includes a helical mechanism 15 and a bearing 16. The cable 06 extends out of the proximal end of the conduit 02 and is welded to the helical mechanism 15 via the bearing 16. The cable 06 also extends through the handle 03 to the distal end of the conduit 02 and connects to the rotator head 05. The rotation of the helical mechanism 15 can drive the cable 06 to rotate, thereby driving the rotator head 05 to rotate coaxially.

[0061] Furthermore, such as Figure 14 and Figure 15 As shown, the cable 06 leading out from the main branch 021 at the proximal end of the catheter 02 is welded to the spiral mechanism 15 through bearing 16 and small bearing 18. The small bearing 18 seals the proximal opening of the main branch 021 of the catheter 02 and does not affect the rotation of the cable 06. The spiral mechanism 15 is connected to an external electric spiral device. When the spiral mechanism 15 rotates, it can drive the rotator head 05 to rotate coaxially through the cable 06 to crush the thrombus.

[0062] In some implementations, such as Figure 12 and Figure 13 As shown, the conduit 02 includes an inner liner 17, an inner reinforcing layer 09, an intermediate reinforcing layer 10, and an outer tube 12 from the inside out; the inner reinforcing layer 09 and the intermediate reinforcing layer 10 include any one of a braided structure, a spring-wound structure, or a hyaluronic acid tube structure.

[0063] The inner liner 17 can be a PTFE (polytetrafluoroethylene) structural component. PTFE is a self-lubricating polymer material, and the smooth inner lumen reduces the friction between the thrombus and the lumen, lowering the probability of the thrombus getting stuck in the lumen during the procedure. The inner reinforcing layer 09 can be a braided, spring-loaded, or laser-cut thiocyanate tube, and the material can be stainless steel, tungsten wire, or nickel-titanium alloy; thus, it can increase the pressure resistance of the catheter 02 and prevent the catheter 02 from being crushed during thrombus aspiration.

[0064] Furthermore, the imaging ring 07 is fixed at the distal end of the liner 17 to assist the operator in accurately determining the location of the distal end of the catheter 02 under DSA (Digital Subtraction Angiography).

[0065] Furthermore, the intermediate reinforcing layer 10 can be in the form of a braided, spring-wound, or laser-cut sodium hypochlorite tube, and the material can be stainless steel, tungsten wire, or nickel-titanium alloy. Control wires 08 are fixed to the outside of the inner reinforcing layer 09, with the two control wires 08 at 180° angles. The distal ends of the control wires 08 are fixed to the developing ring 07 by welding. That is, a control wire 08 is welded to each of two opposite positions on the circumference of the developing ring 07.

[0066] Two control wires 08, welded to the imaging ring 07, are led out from the proximal side incision and connected to the left and right bending pushers 14 respectively. When the catheter 02 needs to be inserted into the vascular branch, the left / right bending pushers 14 are pushed and pulled according to the angle of the DSA vessel, so that the distal end of the catheter 02 gradually bends to adapt to the curved part of the vessel, and the catheter 02 is pushed smoothly into the target vessel, realizing the guidewire-free operation.

[0067] Furthermore, the material hardness of the outer tube 12 gradually transitions from the proximal end to the distal end; that is, the distal end of the outer tube 12 is softer and the proximal end is harder, so as to facilitate bending of the distal end of the conduit 02. The outer tube 12 can be fabricated using a thermorheological process.

[0068] Optionally, in some embodiments, an outer reinforcing layer 11 is further provided between the intermediate reinforcing layer 10 and the outer tube 12. The outer reinforcing layer 11 is a braided structure, a spring structure, or a hyaluronic acid tube structure, and the material can be stainless steel, tungsten wire, or nickel-titanium alloy. The purpose of the outer reinforcing layer 11 is to further improve the product's torsional control and pushing performance. The absence of an outermost layer is also within the scope of this invention. The accompanying drawings of this embodiment show the structure of the three reinforcing layers: the inner reinforcing layer 09, the intermediate reinforcing layer 10, and the outer reinforcing layer 11. However, in other embodiments, only the inner reinforcing layer 09 and the intermediate reinforcing layer 10 may be provided.

[0069] In some embodiments of this application, such as Figure 13 As shown, the aforementioned hypoecho tube structure is a clockwise spiral grooved structure, divided into three sections with varying pitches. The groove pitch gradually decreases from the handle 03 towards the distal end. Specifically, when the groove spacing is equal, the density of the groove spacing is higher at the distal end and lower at the handle 03. This means the distance between adjacent grooves near the tip of the hypoecho tube decreases, ensuring strong pushability at the proximal end and high flexibility at the distal end, making it easier for the catheter 02 to pass through tortuous blood vessels.

[0070] In some implementations, such as Figure 3 As shown, the outer tube 12 is also provided with an axially extending side hole 121. The side hole 121 has an opening at one end of the outer tube 12 near the head end 01. That is, the catheter 02 is also provided with a side hole 121 for spraying contrast agent. The opening of the side hole 121 is located at the distal end of the catheter 02.

[0071] During the thrombus removal process using the aspiration catheter 02 provided in this embodiment, when the distal end of the catheter 02 approaches the thrombus, the negative pressure provided at the proximal end draws the thrombus to the perforated structure of the protective cover 04. Simultaneously, the burr head 05 rotates at high speed under the drive of the spiral mechanism 15 and the cable 06, breaking up the thrombus and preventing large-diameter or old thrombi from blocking the catheter 02. The broken thrombus is then drawn out of the blood vessel through the catheter 02 under negative pressure, restoring blood flow within the vessel. Contrast agent can be sprayed through the side port 121 of the catheter 02, and the location of the thrombus within the blood vessel and postoperative blood flow can be monitored by DSA. DSA can also accurately determine the location of the distal end of the catheter 02.

[0072] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A suction catheter, characterized in that, It includes a catheter, a handle connected to the proximal end of the catheter, and a head end connected to the distal end of the catheter, the head end including a protective cover and a rotator disposed inside the protective cover; A cable is installed inside the conduit, the cable extends to the distal end of the head end and is fixedly connected to the rotary head, and the protective cover is provided with a hollow structure; The cable is configured to drive the burr head to rotate, which can break up blood clots that enter the protective cover; The cauterization head includes M cutting blades arranged along the circumference of the conduit, where M is a positive integer greater than or equal to 2; each cutting blade includes a horizontal cutting portion extending along the axial direction of the conduit and a vertical cutting portion extending along the radial direction of the conduit, one end of the vertical cutting portion being fixedly connected to the proximal end of the horizontal cutting portion, and the other end of the vertical cutting portion being fixedly connected to the cable; at least two of the horizontal cutting portions have unequal lengths along the axial direction of the conduit; and / or, at least two of the vertical cutting portions have unequal lengths along the radial direction of the conduit; The rotary grinding head also includes a connecting part, and the distal ends of the horizontal cutting parts are all connected to the connecting part; at least two of the horizontal cutting parts have unequal lengths along the axial direction of the conduit; the distal ends of M horizontal cutting parts are flush, and the vertical cutting parts corresponding to the M horizontal cutting parts are connected to different positions on the cable. At least two of the vertical cut portions have unequal lengths along the radial direction of the conduit; One end of each of the M vertical cut sections is fixedly connected to the cable, and the other end is at a different distance from the cable. Let one of the cutting blades be the first cutting blade and the other cutting blade be the second cutting blade; the length of the horizontal cutting portion of the first cutting blade is L11, the length of the horizontal cutting portion of the second cutting blade is L21, the length of the vertical cutting portion of the first cutting blade is L12, and the length of the vertical cutting portion of the second cutting blade is L22, wherein L11 > L21 and L12 > L22.

2. The aspiration catheter according to claim 1, characterized in that, M=4。 3. The aspiration catheter according to claim 1, characterized in that, The spacing between any two adjacent vertical cut portions along the cable axis is equal; and / or, The two vertical cut portions that are opposite each other in the circumferential direction of the catheter are spaced equally along the axial direction of the catheter.

4. The aspiration catheter according to claim 1, characterized in that, The horizontal cutting section has a cutting surface, and the cutting surface on at least one side in the circumferential direction of the conduit has a cutting edge, which has a wavy tooth structure.

5. The aspiration catheter according to claim 1, characterized in that, The cable includes a first metal layer disposed on the outer layer and a second metal layer disposed on the inner layer; the first metal layer includes N1 first metal wires spirally wound in a first direction, and the second metal layer includes N2 second metal wires spirally wound in a second direction, wherein the first direction and the second direction are opposite.

6. The aspiration catheter according to claim 5, characterized in that, The diameter of the first metal wire is equal to the diameter of the second metal wire.

7. The aspiration catheter according to claim 5, characterized in that, The cable also includes a third metal layer located inside the second metal layer, the third metal layer containing a third metal wire, and the second metal wire being distributed circumferentially along the third metal wire.

8. The aspiration catheter according to claim 1, characterized in that, The handle includes a housing and a bending adjustment knob slidably connected to the housing; a radiopaque ring is provided at the distal end of the catheter, and a control wire is provided inside the catheter, one end of which is fixedly connected to the radiopaque ring, and the other end is fixed to the bending adjustment knob, pushing the bending adjustment knob to pull the control wire to bend the distal end of the catheter where the radiopaque ring is located; and / or, The proximal branch of the catheter is provided with a Luer interface, which provides negative pressure to the space inside the protective cover by connecting to a negative pressure suction device; and / or, The handle also includes a helical mechanism and a bearing. The cable extends out of the proximal end of the conduit and is welded to the bearing and the helical mechanism. The rotation of the helical mechanism can drive the cable to rotate, thereby driving the grinding head to rotate coaxially.

9. The aspiration catheter according to claim 1, characterized in that, The conduit comprises, from the inside out, an inner liner, an inner reinforcing layer, an intermediate reinforcing layer, and an outer tube; the inner reinforcing layer and the intermediate reinforcing layer include any one of a braided structure, a spring-wound structure, or a hyaluronic acid tube structure. And / or, an outer reinforcing layer is further provided between the intermediate reinforcing layer and the outer tube, wherein the outer reinforcing layer is a braided structure, a spring-wound structure, or a hyaluronic acid tube structure. And / or, the outer tube is further provided with an axially extending side hole, the side hole having an opening at one end of the outer tube near the head end.

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