Thrombus aspiration catheter and catheter body

Abstract

The thrombus aspiration catheter comprises an aspiration pipe, a filtering piece and an outflow channel, the aspiration pipe comprises a pipe wall and a pipeline defined by the pipe wall, the pipe wall comprises a body part and protruding ribs arranged in a protruding mode towards the axis of the pipeline, and at least two protruding ribs extend in the direction of a connecting line from the near end to the far end of the aspiration pipe; a groove is formed between every two adjacent protruding ribs. The filtering piece is connected with the suction pipe and located in the pipeline, and at least part of the filtering piece is opposite to the groove; the outflow channel is connected with the near end of the suction pipe and provided with an outflow window communicating the inside and the outside of the pipeline. According to the thrombus suction catheter, the catheter wall comprises the body part and the protruding ribs, and the grooves are formed between the adjacent protruding ribs, so that when thrombus is sucked into a pipeline and gathered at the filter part, blood can pass through the gaps at the grooves between the thrombus and the catheter wall, and the probability that the thrombus blocks the pipeline at the filter part is reduced; and the thrombus containing capacity in the suction pipe is improved.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, and in particular relates to thrombus aspiration catheters and catheter bodies. Background Technology

[0002] The main treatments for thrombotic diseases include anticoagulation, antithrombotic, and thrombolytic drug therapy, as well as interventional surgery. During interventional surgery, a stent can be used to directly remove the thrombus, but this method cannot guarantee complete removal of the thrombus, and residual thrombus may remain. Alternatively, mechanical structures or high-speed water jets can be used to cut the thrombus attached to the surface of the blood vessel, and the fragments can be suctioned out. However, this method may damage red blood cells or the blood vessel wall during the fragmentation process, and the fragments may also be displaced to other parts of the patient's body, affecting patient safety.

[0003] Currently, to avoid residual thrombi and injury to patients during thrombus fragmentation, negative pressure aspiration can be used to remove thrombi from the patient's body. Aspiration structures typically include an aspiration catheter and a filter located inside the catheter. The aspiration catheter collects thrombi within the filter while aspirating blood. However, thrombus buildup at the filter can block the aspiration catheter, preventing further thrombus aspiration and significantly affecting the amount of thrombi collected. Utility Model Content

[0004] This application provides a thrombus aspiration catheter and tube body, which are designed to reduce the probability of thrombus clogging the tube at the filter element.

[0005] The first aspect of this application provides a thrombus aspiration catheter, including an aspiration tube, a filter element, and an outflow channel. The aspiration tube includes a tube wall and a conduit formed by the tube wall. The tube wall includes a body portion and protruding ribs that protrude toward the axis of the conduit. At least two protruding ribs extend along the line connecting the proximal end to the distal end of the aspiration tube, and a groove is formed between adjacent two protruding ribs. The filter element is connected to the aspiration tube and located inside the conduit, and is at least partially opposite to the groove. The outflow channel is connected to the proximal end of the aspiration tube, and an outflow window communicating with the inside and outside of the conduit is provided on the outflow channel.

[0006] According to an embodiment of the first aspect of this application, the filter includes a cone-shaped mesh bag with an opening at the distal end and a bottom at the proximal end; the opening is connected to a suction tube to confine any blood clots entering the suction tube within the mesh bag.

[0007] According to the embodiment of the first aspect of this application, the inner surface of the main body forms a first reference circumferential surface, and the top of a plurality of protruding ribs facing the axis of the pipeline forms a second reference circumferential surface. The diameter D1 of the first reference circumferential surface and the diameter D2 of the second reference circumferential surface satisfy the formula 0.8 < D2 / D1 < 1.

[0008] According to the embodiment of the first aspect of this application, the inner surface of the main body is enclosed to form a first reference circumferential surface, the diameter of the first reference circumferential surface is D1; ​​the number of protruding ribs is N, the width of the protruding ribs in the circumferential direction of the suction tube is L, and the protruding ribs satisfy the formula L*N / (π*D1)≤0.35.

[0009] According to an embodiment of the first aspect of this application, the cross-sectional shape of the protruding rib in the axial direction of the vertical suction tube is at least one of a triangle, a rectangle, a semicircle, and a trapezoid.

[0010] According to an embodiment of the first aspect of this application, the protruding rib extends in a straight or spiral direction.

[0011] According to an embodiment of the first aspect of this application, the protruding rib extends in a spiral direction, and the angle between the tangential direction of the protruding rib and the axial direction is less than 30°.

[0012] According to an embodiment of the first aspect of this application, the pipe wall includes a support structure and a covering layer, the covering layer being located on the side of the support structure facing the pipe and / or the side away from the pipe, and the hardness of the support structure being greater than the hardness of the covering layer.

[0013] According to an embodiment of the first aspect of this application, the support structure is in the form of a grid, or the support structure includes at least one support rib extending in a spiral direction and surrounding the pipeline.

[0014] According to the embodiments of the first aspect of this application, all protruding ribs are composed of a covering layer, or, part of the protruding ribs are composed of a supporting structure and the other part is composed of a covering layer.

[0015] According to an embodiment of the first aspect of this application, it further includes: a distal tube connected to the distal end of the aspiration tube; and / or, the thrombus aspiration catheter further includes a one-way valve connected to the tube wall and located within the tube, the one-way valve being located at the distal end of the filter element; and / or, the filter element includes a mesh and a plurality of mesh openings formed by the mesh.

[0016] A second aspect of this application provides a pipe body, including a pipe wall and a pipeline formed by the pipe wall. The pipe wall includes a body portion and protruding ribs protruding toward the axis of the pipeline. At least two protruding ribs extend along the line connecting the proximal end to the distal end of the pipe body, and a groove is formed between adjacent two protruding ribs.

[0017] The thrombus aspiration catheter of this application includes an outflow channel, a suction tube, and a filter. When thrombi and blood are drawn into the tubing from the distal end of the suction tube, the filter intercepts the thrombus within the tubing, while the blood, after passing through the filter, flows back into the patient's blood vessel through an outflow window in the outflow channel, thereby reducing blood loss during thrombus aspiration. By including a main body and protruding ribs extending towards the axis of the tubing in the tube wall, with grooves formed between adjacent ribs, when the thrombus is drawn into the tubing and converges at the filter, the gap between the thrombus and the tube wall, along with the grooves, allows blood to pass through, thereby reducing the probability of thrombi clogging the tubing at the filter and increasing the thrombus capacity of the suction tube. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a thrombus aspiration catheter according to some embodiments of this application;

[0020] Figure 2 A schematic longitudinal cross-sectional view of an example thrombus aspiration catheter is shown.

[0021] Figure 3 A schematic cross-sectional view of an example thrombus aspiration catheter at section AA is shown.

[0022] Figure 4 An example is shown. Figure 3 A magnified view of the thrombus aspiration catheter at position B;

[0023] Figure 5 Another example is shown Figure 3 A magnified view of the thrombus aspiration catheter at position B;

[0024] Figure 6 This shows yet another example. Figure 3 A magnified view of the thrombus aspiration catheter at position B;

[0025] Figure 7 Another example is shown. Figure 3 A magnified view of the thrombus aspiration catheter at position B;

[0026] Figure 8 An example is shown. Figure 2 A magnified schematic diagram of the thrombus aspiration catheter at position C.

[0027] Figure label:

[0028] 10. Thrombus aspiration catheter;

[0029] 100. Suction tube; 110. Tube wall; 111. Body; 112. Protruding rib; 113. Groove; 114. Support structure; 115. Covering layer; 120. Pipeline;

[0030] 200. Filter components;

[0031] 300. Outflow channel; 310. Outflow window; 320. Impeller;

[0032] 400. Check valve;

[0033] x, first direction; y, first reference circumferential surface; z, second reference circumferential surface. Detailed Implementation

[0034] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0036] To address the technical problems mentioned in the background art, the applicant proposes a thrombus aspiration catheter, comprising an aspiration tube, a filter element, and an outflow channel. The aspiration tube includes a tube wall and a conduit formed by the tube wall. The tube wall includes a body portion and protruding ribs extending toward the axis of the conduit. At least two protruding ribs extend along the line connecting the proximal and distal ends of the aspiration tube, and a groove is formed between adjacent two protruding ribs. The filter element is connected to the aspiration tube and located within the conduit, and is at least partially opposite to the groove. The outflow channel is connected to the proximal end of the aspiration tube, and an outflow window communicating with the inside and outside of the conduit is provided on the outflow channel.

[0037] In this application, the proximal end refers to the end facing the operator or physician, and the distal end refers to the end away from the operator or physician.

[0038] The thrombus aspiration catheter of this application includes an outflow channel, a suction tube, and a filter. When thrombi and blood are drawn into the tubing from the distal end of the suction tube, the filter traps the thrombus within the tubing, while the blood, after passing through the filter, flows back into the patient's blood vessel through an outflow window in the outflow channel, thereby reducing blood loss during thrombus aspiration. By including a main body and protruding ribs extending along the axis of the tubing in the tube wall, with grooves formed between adjacent ribs, when the thrombus is drawn into the tubing and converges at the filter, the gap between the thrombus and the tube wall, along with the grooves, allows blood to pass through, thus reducing the probability of thrombi clogging the tubing at the filter and increasing the thrombus capacity of the suction tube.

[0039] The thrombus aspiration catheter provided in the embodiments of this application will be described below with reference to the accompanying drawings. It should be noted that in the drawings, the direction extending along the line connecting the proximal and distal ends of the thrombus aspiration catheter, and pointing from the distal end to the proximal end, is the first direction, denoted as x. In the drawings, for ease of drawing, the dimensions are not necessarily proportional to the actual dimensions.

[0040] Figure 1 This is a schematic diagram of the structure of a thrombus aspiration catheter according to some embodiments of this application; Figure 2 A schematic longitudinal cross-sectional view of an example thrombus aspiration catheter is shown. Figure 3 A schematic cross-sectional view of an example thrombus aspiration catheter at section AA is shown.

[0041] Combination Figures 1 to 3As can be seen, in order to solve the technical problems involved in the background art, the applicant proposes a thrombus aspiration catheter 10, including an aspiration tube 100, a filter element 200, and an outflow channel 300. The aspiration tube 100 includes a tube wall 110 and a conduit 120 formed by the tube wall 110. The tube wall 110 includes a body portion 111 and protruding ribs 112 protruding towards the axis of the conduit 120. At least two protruding ribs 112 extend along the line connecting the proximal end to the distal end of the aspiration tube 100 (x direction in the figure), and a groove 113 is formed between adjacent two protruding ribs 112. The filter element 200 is connected to the aspiration tube 100 and is located inside the conduit 120. The outflow channel 300 is connected to the proximal end of the aspiration tube 100, and the outflow channel 300 is provided with an outflow window 310 communicating with the inside and outside of the conduit 120.

[0042] It should be noted that, for ease of drawing and description, the x-direction in the figure is a straight line, but in reality, the suction tube 100 has a certain degree of flexibility to facilitate its insertion into blood vessels. In fact, the extension direction of the central axis of the suction tube 100 can also be curved.

[0043] In the direction of the line connecting the proximal and distal ends of the suction tube 100, the protruding rib 112 can extend in a straight line, a curve, or a spiral. The protruding rib 112 can extend from one end of the suction tube 100 to the other end, or it can be located only in a section of the suction tube 100.

[0044] In some embodiments, an impeller 320 is also provided in the outflow channel 300. When the impeller 320 rotates, it drives blood and thrombi from the distal end of the suction tube 100 into the tubing 120. The filter element 200 intercepts the thrombi in the tubing, and the blood flows back into the patient's blood vessel through the outflow window 310 on the outflow channel 300 after passing through the filter element 200.

[0045] The thrombus aspiration catheter 10 provided in this application includes an outflow channel 300, a suction tube 100, and a filter element 200. When thrombi and blood are aspirated into a second tubing from the distal end of the suction tube, the filter element 200 intercepts the thrombus within the second tubing, while the blood, after passing through the filter element, flows back into the patient's blood vessel through an outflow window 310 on the outflow channel 300, thereby reducing the patient's blood loss during thrombus aspiration. The tube wall 110 includes a body portion 111 and protruding ribs 112 extending towards the axis of the tubing 120, with grooves 113 formed between adjacent protruding ribs 112.

[0046] During use, the filter element 200 and the blood clot filtered by the filter element 200 will tend to move towards the proximal outlet of the suction tube 100 under the action of blood. At this time, the blood clot will accumulate at the connection between the filter element 200 and the tube wall 110 on the side near the proximal outlet of the suction tube 100. When the blood clot accumulates to a certain extent, it may cause the suction tube 100 to become blocked.

[0047] The thrombus aspiration catheter 10 provided in this application, by setting protruding ribs 112, allows blood to pass through the gap at the groove 113 between the thrombus and the catheter wall 110 when the thrombus is drawn into the tube 120 and converges at the filter element 200. This reduces the probability of the thrombus clogging the tube 120 at the filter element 200. The negative pressure suction force of the impeller 320 can still continue to aspirate distal thrombi through this gap until the filter screen is full, increasing the thrombus capacity of the aspiration tube 100. In addition, the setting of protruding ribs 112 also helps to improve the structural strength of the corresponding part of the tube wall 110, improve the tube wall 110's resistance to negative pressure deformation, and make the tube wall 110 less prone to bending during use.

[0048] After describing the overall structure of the thrombus aspiration catheter 10, the following will describe several implementation methods of the aspiration tube 100 with reference to the attached figures. Figure 4 An example is shown. Figure 3 A magnified view of the thrombus aspiration catheter at position B; Figure 5 Another example is shown Figure 3 A magnified view of the thrombus aspiration catheter at position B; Figure 6 This shows yet another example. Figure 3 A magnified view of the thrombus aspiration catheter at position B; Figure 7 Another example is shown. Figure 3 A magnified schematic diagram of the thrombus aspiration catheter at position B.

[0049] Combination Figures 1 to 7 It can be seen that, in some optional embodiments, the cross-sectional shape of the protruding rib 112 in the axial direction of the vertical suction tube 100 is triangular (e.g., Figure 4 As shown), rectangle (as shown) Figure 5 (as shown), semicircle, trapezoid (as shown) Figure 6 (as shown) and other polygons (such as) Figure 7 At least one of the following (shown). In this embodiment, the cross-sectional shape of the protruding rib 112 in the axial direction of the vertical suction tube 100 is illustrated as rectangular.

[0050] It should be noted that the cross-sectional shape of the suction tube 100 is always axisymmetric. The suction tube 100 has a central axis, and the extension direction of the central axis is the first direction x in the figure. The cross-sectional shape of the suction tube 100 can be circular or other axisymmetric shapes. In this embodiment, an approximate circular cross-sectional shape of the suction tube 100 is used as an example. Since the suction tube 100 is a cylindrical structure, it has two circumferential surfaces: the outer circumferential surface of the outer wall and the inner circumferential surface of the inner wall. The axial direction of the suction tube 100 refers to the direction of the extension of the central axis, the circumferential direction refers to the circumferential direction of the outer perimeter of the cylinder, and the radial direction refers to the direction through the central axis in the radial plane, usually also referring to a straight line along the diameter or radius, or a straight line perpendicular to the central axis. The radial dimension generally refers to the radius or diameter of the axisymmetric part, and the circumferential dimension generally refers to the circumference of the axisymmetric part. It can be understood that in this application, the axial, circumferential, radial, and circumferential surfaces of other components can refer to the aforementioned description of the suction tube 100.

[0051] In some embodiments, the protruding ribs 112 extend in a straight or helical direction. Multiple protruding ribs 112 are arranged around the conduit 120.

[0052] In some embodiments, the protruding rib 112 extends in a helical direction, and the angle between the tangential direction of the protruding rib and the axial direction is less than 30°.

[0053] In some optional embodiments, the inner surface of the body portion 111 encloses a first reference circumferential surface y, and the top of a plurality of protruding ribs 112 facing the axis of the pipeline encloses a second reference circumferential surface z. The diameter D1 of the first reference circumferential surface y and the diameter D2 of the second reference circumferential surface z satisfy the formula 0.8 < D2 / D1 < 1.

[0054] Since the body portion 111 is arranged around the pipe 120, the body portion 111 includes an inner surface facing the pipe 120 and an outer surface facing away from the pipe 120. The first reference circumferential surface y is formed by the inner surface of the body portion 111. Because there is a gap between two adjacent protruding ribs 112, the second reference circumferential surface z is not a solid circumferential surface, but a virtual circumferential surface formed by connecting the top surfaces of multiple protruding ribs 112 with the central axis of the suction tube as the center.

[0055] It should be noted that when the cross-sectional shape of the protruding rib 112 is triangular or semi-circular, its top facing the axis of the pipeline is a single edge. When the cross-sectional shape of the protruding rib 112 is rectangular or trapezoidal, its top facing the axis of the pipeline is a plane or a small arc surface.

[0056] In some embodiments, the protruding rib 112 is smaller in the radial dimension than the minimum size of the thrombus. Since the height of the protruding rib 112 is equal to the depth of the groove 113, it can also be understood that the depth of the groove 113 is less than the minimum width of the thrombus, so that when the thrombus converges at the filter element 200, the thrombus will not pass through the groove 113 and cause the thrombus to escape.

[0057] The thrombus aspiration catheter 10 provided in this application ensures that the diameter D1 of the first reference circumferential surface y and the diameter D2 of the second reference circumferential surface z satisfy the formula 0.8 < D2 / D1 < 1, so that the size of the protruding rib 112 is within a suitable size range, thereby reducing the probability of thrombus blockage or thrombus escape when the depth of the groove 113 is too small or too large.

[0058] In some optional embodiments, the number of protruding ribs 112 is N, the width of the protruding ribs 112 in the circumferential direction of the suction tube 100 is L, and the protruding ribs 112 satisfy the formula L*N / (π*D1)≤0.35.

[0059] Where π*D1 refers to the perimeter of the first reference circumference surface y, and L*N refers to the sum of the widths of all protruding ribs 112 on the suction tube 100. Therefore, the formula L*N / (π*D1) refers to the ratio of the sum of the widths of all protruding ribs 112 to the perimeter of the first reference circumference surface y. It is easy to understand that the larger the value of L*N / (π*D1), the smaller the width of the groove 113, and the better the effect of preventing thrombus escape. The smaller the value of L*N / (π*D1), the larger the width of the groove 113, and the lower the probability of thrombus blockage at the filter element 200 causing blood stasis.

[0060] In some embodiments, the width of the groove 113 is smaller than the minimum size of the thrombus.

[0061] The thrombus aspiration catheter 10 provided in this application reduces the probability of thrombus blockage when the width of the groove 113 is too small by ensuring that the protruding rib 112 satisfies the formula L*N / (π*D1)≤0.35.

[0062] Figure 8 An example is shown. Figure 2 A magnified schematic diagram of the thrombus aspiration catheter at position C. Figure 8 The filters are not displayed.

[0063] Combination Figure 8 It is understood that, in some optional embodiments, the pipe wall 110 includes a support structure 114 and a cover layer 115. The cover layer 115 is located on the side of the support structure 114 facing the pipe 120 and / or on the side away from the pipe 120. The hardness of the support structure 114 is greater than the hardness of the cover layer 115. That is, the cover layer 115 is located on at least one side of the support structure 114, inside or outside.

[0064] In this embodiment, all protruding ribs 112 are composed of a covering layer 115, or a portion of the protruding ribs 112 is composed of a supporting structure 114 and another portion is composed of a covering layer 115. In this embodiment, all protruding ribs are composed of a covering layer 115, which can also be understood as the supporting structure 114 being completely located within the body portion 111, or the body portion 111 being completely composed of the supporting structure 114.

[0065] In some embodiments, the support structure 114 is made of stainless steel or nickel-titanium alloy to improve the maneuverability and support of the suction tube 100 and prevent the suction tube 100 from collapsing due to excessive negative pressure.

[0066] In some embodiments, the material of the covering layer 115 includes medical polymer materials, such as polytetrafluoroethylene, block polyetheramide resin, thermoplastic polyurethane rubber, etc. The covering layer 115 located inside the support structure 114 has a lower coefficient of friction than the support structure 114, which reduces friction with blood and prevents thrombus formation on the inner surface of the suction tube 100. The covering layer 115 located outside the support structure 114 has good biocompatibility and physical properties, avoiding adverse reactions in patients. The covering layer 115 located outside the support structure 114 also has a chamfered taper design at its distal opening to prevent the distal end of the suction tube 100 from scratching blood vessels.

[0067] In this embodiment, the example is provided by having a cover layer 115 on both the inner and outer sides of the support structure 114. The materials of the cover layers 115 located on the inner and outer sides of the support structure 114 can be different. For example, the material of the cover layer 115 located on the inner side of the support structure 114 can be polytetrafluoroethylene (PTFE), thereby reducing friction between the inner cover layer 115 and blood, and lowering the risk of thrombus formation inside the suction tube 100. The material of the cover layer 115 located on the outer side of the support structure 114 can be a medical polymer material, such as block polyetheramide resin, thermoplastic polyurethane elastomer, or nylon, which can improve the biocompatibility between the outer cover layer 115 and human tissue, and simultaneously improve the physical properties of the tube wall 110, reducing damage to human tissue when the suction tube 100 is inserted into the human body. Furthermore, an etched layer can be formed on the surface of the inner cover layer 115. The etched layer can increase the composite strength between the inner and outer cover layers 115, reducing the risk of cracking of the inner and outer cover layers 115.

[0068] In some embodiments, the cover layer 115 is connected to the support structure 114 by soft fusion welding.

[0069] In some embodiments, the support structure 114 is in the form of a mesh, and the support structure 114 may be woven from multiple metal wires.

[0070] In other embodiments, the support structure 114 includes at least one support rib (not shown), which extends in a helical direction and surrounds the tubing. The thrombus aspiration catheter 10 provided in this application, by using a composite material for the tube wall 110, ensures both maneuverability and support of the aspiration tube 100, while also possessing a certain axial stiffness and radial flexibility, allowing it to twist when pushed. Furthermore, it makes the surface of the aspiration tube 100 biocompatible, preventing thrombus formation on the surface of the aspiration tube 100 and avoiding adverse reactions in patients.

[0071] After describing several implementations of the aspiration tube 100, the following will describe several implementations of other components of the thrombus aspiration catheter 10 in conjunction with the accompanying drawings.

[0072] Combination Figures 1 to 3 It is understood that, in some optional embodiments, the thrombus aspiration catheter 10 further includes a one-way valve 400, which is connected to the tube wall 110 and located within the tube 120, at the distal end of the filter element 200. The one-way valve 400 ensures that blood and thrombi can only enter the tube 120 from the distal end and cannot flow out from it. The one-way valve 400 effectively prevents thrombi from flowing back into the body. When the impeller 320 stops operating or under other special circumstances, the one-way valve 400 effectively prevents the reverse flow of blood and thrombi within the tube 120.

[0073] The one-way valve 400 can be a bioprosthetic valve, a mechanical valve, or other structure that only allows unidirectional flow. When the one-way valve 400 is a bioprosthetic valve, the number of valves in the one-way valve 400 can be 2 or 3. The opening and closing threshold of the one-way valve 400 is between blood pressure and the negative pressure generated by the rotation of the impeller 320; that is, when the impeller 320 rotates, the valve of the one-way valve 400 opens, and when the impeller 320 stops, the valve of the one-way valve 400 closes, and blood pressure cannot force open the valve of the one-way valve 400. The one-way valve 400 is fixed in the pipeline 120 by mechanical connection or adhesive bonding.

[0074] In some implementations, combined Figure 2 As can be seen, the filter element 200 includes a conical mesh bag with an opening at the distal end and a bottom at the proximal end. The opening of the mesh bag connects to the suction tube to confine any blood clots entering the suction tube within the mesh bag. The mesh opening of the mesh bag is smaller than the minimum size of a blood clot. Depending on the specific application, the mesh opening size can be between 0.1 mm. 2 -16mm 2 between.

[0075] In some embodiments, the filter element 200 is positioned opposite at least a portion of the groove 113. Possible scenarios include: in the axial direction of the suction tube 100, the groove 113 extends completely from the proximal end to the distal end of the suction tube 100, while the filter element 200 is positioned opposite only a segment of the groove 113; or, in the axial direction of the suction tube 100, the groove 113 extends only to a segment of the suction tube 100, and the filter element 200 is completely contained within that segment of the suction tube 100 containing the groove 113; or, in the axial direction of the suction tube 100, the groove 113 extends only to a segment of the suction tube 100, and the groove 113 is located at either the proximal or distal end of the filter element 200, but the groove 113 and filter element 200 still partially overlap in the radial direction of the suction tube 100. In all the above scenarios, when collecting blood clots, the groove 113 of the filter element 200 can allow blood to pass through, reducing the probability of blood clots clogging the tubing at the filter element 200.

[0076] In some embodiments, the material of the filter element 200 includes polyethylene terephthalate or polypropylene.

[0077] In other embodiments, the filter element 200 may also be a sheet-like filter.

[0078] In some embodiments, the thrombus aspiration catheter 10 may further include a distal tube (not shown), which is connected to the distal end of the aspiration tube 100. Different sizes of distal tubes can be used depending on the location of the thrombus, allowing the thrombus aspiration catheter 10 to accommodate thrombi of various locations and sizes. The distal tube and the aspiration tube 100 are detachably connected via clips or other means.

[0079] In some embodiments, the distal end of the aspiration tube 100 is further provided with a radiopaque ring (not shown), the radiopaque ring being made of a radiopaque material, such as metal. During intervention, the user can determine the position of the radiopaque ring using external devices, thereby inferring the position of the aspiration tube 100.

[0080] In addition, this application also provides a pipe body, including a pipe wall and a pipeline formed by the pipe wall. The pipe wall includes a body portion and protruding ribs protruding toward the axis of the pipeline. At least two protruding ribs extend along the line connecting the proximal end to the distal end of the pipe body, and a groove is formed between adjacent two protruding ribs.

[0081] The tube in this embodiment can be used in the suction tube 100 of the above embodiment, or it can be used in other scenarios, such as irrigation tubes, drainage tubes, gastric tubes, etc.

[0082] The tube in this embodiment can produce the same technical effect as the suction tube 100 in the thrombus aspiration catheter 10 described above, and will not be described again here.

[0083] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A thrombus aspiration catheter, characterized in that, include: A suction tube, the suction tube including a tube wall and a channel formed by the tube wall, the tube wall including a body portion and protruding ribs protruding toward the axis of the channel, at least two of the protruding ribs extending along the line connecting the proximal end to the distal end of the suction tube, and a groove forming between two adjacent protruding ribs. A filter element is connected to the suction tube and located within the tube, and is at least partially opposite the groove position; An outflow channel is connected to the proximal end of the suction tube, and the outflow channel is provided with an outflow window that connects the inside and outside of the tube.

2. The thrombus aspiration catheter according to claim 1, characterized in that, The filter element includes a cone-shaped mesh bag with an opening at the distal end and a bottom at the proximal end; the opening is connected to the suction tube to confine any blood clots entering the suction tube within the mesh bag.

3. The thrombus aspiration catheter according to claim 1, characterized in that, The inner surface of the main body forms a first reference circumferential surface, and the top of the plurality of protruding ribs facing the axis of the pipeline forms a second reference circumferential surface. The diameter D1 of the first reference circumferential surface and the diameter D2 of the second reference circumferential surface satisfy the formula 0.8 < D2 / D1 < 1.

4. The thrombus aspiration catheter according to claim 1, characterized in that, The inner surface of the main body forms a first reference circumferential surface with a diameter of D1; the number of protruding ribs is N, the width of the protruding ribs in the circumferential direction of the suction tube is L, and the protruding ribs satisfy the formula L*N / (π*D1)≤0.

35.

5. The thrombus aspiration catheter according to claim 1, characterized in that, The cross-sectional shape of the protruding rib in the direction perpendicular to the suction tube is at least one of triangle, rectangle, semicircle and trapezoid.

6. The thrombus aspiration catheter according to claim 1, characterized in that, The protruding ribs extend in a straight line or a spiral direction.

7. The thrombus aspiration catheter according to claim 6, characterized in that, The protruding rib extends in a spiral direction, and the angle between the tangent direction of the protruding rib and the axial direction is less than 30°.

8. The thrombus aspiration catheter according to claim 1, characterized in that, The pipe wall includes a support structure and a covering layer. The covering layer is located on the side of the support structure facing the pipe and / or on the side away from the pipe. The hardness of the support structure is greater than that of the covering layer.

9. The thrombus aspiration catheter according to claim 8, characterized in that, The support structure is in the form of a grid, or the support structure includes at least one support rib extending in a spiral direction and surrounding the pipeline.

10. The thrombus aspiration catheter according to claim 8, characterized in that, The protruding ribs are all composed of the covering layer, or a portion of the protruding ribs are composed of the supporting structure and another portion is composed of the covering layer.

11. The thrombus aspiration catheter according to claim 1, characterized in that, Also includes: The distal tube is connected to the distal end of the suction tube; And / or, the thrombus aspiration catheter further includes a one-way valve, which is connected to the tube wall and located within the tube, and the one-way valve is located at the distal end of the filter element.

12. A tube body, characterized in that, The device includes a pipe wall and a conduit formed by the pipe wall. The pipe wall includes a body portion and protruding ribs that protrude toward the axis of the conduit. At least two of the protruding ribs extend along a line connecting the proximal and distal ends of the pipe body, and a groove is formed between two adjacent protruding ribs.

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