Suction catheter

Abstract

The embodiment of the utility model provides a suction catheter, and relates to the field of medical instruments. The catheter head end is provided with an annular suction port, a part of the port structure of the annular suction port is sunken towards the near end of the catheter head end, so that the annular suction port forms a concave port part, and therefore, when the annular suction port of the catheter head end is in irregular contact with thrombus, the thrombus can be sucked out of the catheter head end, and the thrombus can be sucked out of the catheter head end. A certain cutting effect and a certain wrapping effect are generated on thrombus, gathering of negative pressure suddenly generated by the thrombus during suction starting at the annular suction end opening is reduced, the annular suction end opening equivalently has an irregular contact face, the situation that the head end of the catheter is blocked can be avoided in the suction process, and the thrombus suction efficiency is improved. And therefore, the thrombus can be greatly prevented from blocking the suction catheter, and the suction efficiency and the suction success are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medical apparatus and instruments, and particularly relates to a suction catheter. BACKGROUND

[0002] The thrombus suction catheter is a kind of neurointerventional instrument, is a kind of fast, safe, efficient thrombectomy technology, and has an important position in neurointerventional science.

[0003] In prior art, the head end port of the thrombus suction catheter is flat, in the process of suction, thrombus under the pressure of blood vessel accelerates to impact the head end of the suction catheter, thrombus coagulation block can be gathered at the head end of the thrombus suction catheter, plugging the head end of the suction catheter occurs, leading to the condition of difficult or impossible suction. SUMMARY

[0004] The utility model provides a kind of suction catheter, which can avoid plugging the head end of the suction catheter in the process of suction, improve suction efficiency and suction success.

[0005] Embodiments of the utility model can be implemented as follows:

[0006] In a first aspect, the utility model provides a catheter head end, the catheter head end has annular suction port, part port structure of the annular suction port is recessed towards the proximal end direction of the catheter head end, to make the annular suction port form concave port portion.

[0007] In optional implementation, at least two part port structures of the annular suction port are recessed towards the proximal end direction of the catheter head end, to make the annular suction port form at least two concave port portions and at least two convex port portions.

[0008] In optional implementation, two part port structures of the annular suction port are recessed towards the proximal end direction of the catheter head end, to make the annular suction port form two concave port portions and two convex port portions.

[0009] Wherein, two concave port portions are distributed with interval, two convex port portions are distributed with interval, and two concave port portions are symmetrically distributed.

[0010] In optional implementation, the annular suction port is annular circular chamfer structure.

[0011] In optional implementation, the proximal end port of the catheter head end has annular plane, and the distal end port of the catheter head end is annular suction port.

[0012] In a second aspect, the utility model provides a kind of suction catheter, including suction pipe, catheter seat and the catheter head end of the aforementioned implementation mode, the proximal end of the suction pipe and the catheter seat connect, and the distal end of the suction pipe and the proximal end of the catheter head end connect.

[0013] In optional implementation mode, the suction catheter further includes a visualization ring, which is arranged at the distal end of the suction pipe.

[0014] In optional implementation mode, the visualization ring has a distal end annular portion, which is parallel to the annular suction port.

[0015] In optional implementation mode, the distance between the visualization ring and the annular suction port is 0.5-2mm.

[0016] In optional implementation mode, the suction pipe is a multi-layer composite pipe structure, which has a PTFE layer, a metal wire coiled spring layer, a metal wire braided layer and a high polymer material outer pipe arranged in sequence from inside to outside.

[0017] The hardness of the high polymer material outer pipe gradually decreases from the proximal end of the high polymer material outer pipe to the distal end of the high polymer material outer pipe.

[0018] The suction catheter of the utility model embodiment has the following advantages, for example:

[0019] The utility model provides a kind of catheter head end, can be applicable to suction catheter, this catheter head end has annular suction port, and part of port structure of annular suction port is recessed to the proximal end direction of catheter head end, to make annular suction port form concave port part, therefore, the annular suction port of this catheter head end when contact with thrombus, will present irregular contact, produce certain cutting effect and wrapping effect to thrombus, reduce the aggregation of negative pressure suddenly generated when thrombus is suctioned at annular suction port, and annular suction port is equivalent to have irregular contact surface, can avoid the situation of plugging catheter head end in the process of suction, to further can greatly avoid the occurrence of thrombus to plug suction catheter, improve suction efficiency and suction success.

[0020] The utility model provides a kind of suction catheter, which includes a suction pipe, a catheter seat and the above-mentioned catheter head end, the proximal end of the suction pipe is connected with the catheter seat, and the distal end of the suction pipe is connected with the proximal end of the catheter head end. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. 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 on the premise of the drawings.

[0022] Figure 1 The first perspective view of the suction catheter provided in the embodiments of the present application is shown.

[0023] Figure 2 The second perspective view of the suction catheter provided in the embodiments of the present application is shown.

[0024] Figure 3 The first perspective view of the partial structure of the suction catheter provided in the embodiments of the present application is shown.

[0025] Figure 4 The second perspective view of the partial structure of the suction catheter provided in the embodiments of the present application is shown.

[0026] Figure 5 The first state of the catheter head entering the blood vessel is shown.

[0027] Figure 6 The second state of the catheter head entering the blood vessel is shown.

[0028] Figure 7 The catheter head suctioning the thrombus and the existing flat suction catheter head suctioning the thrombus are shown.

[0029] Icon: 100-catheter head; 111-ring suction port; 1111-concave port part; 1112-convex port part; 200-suction tube; 300-catheter seat; 400-development ring; 401-distal ring part; 10-simulated blood vessel; 20-thrombus; 30-flat suction catheter head. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical scheme in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the application.

[0032] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0033] In the description of the application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the product of the application when it is usually placed, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the application.

[0034] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] It should be noted that the features in the embodiments of the application can be combined with each other without conflict.

[0036] Thrombus is a small mass formed on the surface of blood flow at the peeling or repairing site of the inner surface of the blood vessels in the cardiovascular system. In variable flow dependent patterns, thrombus is composed of insoluble fibrin, deposited platelets, accumulated white blood cells and trapped red blood cells. In human blood vessels, through deposition, atherosclerotic plaques, clots and other obstructions, these obstructions can block or interrupt blood flow.

[0037] When the above obstructions occur in the blood vessels, local tissue ischemia can occur, which can cause serious sequelae such as stroke, myocardial infarction, pulmonary embolism, deep vein thrombosis of lower extremity, etc. The incidence is extremely high and is the main cause of death, and shows a trend of youth.

[0038] Currently, the main clinical methods for clearing arterial and venous thrombosis include thrombolysis and mechanical thrombectomy. Thrombus aspiration is a type of mechanical thrombectomy. Thrombus aspiration catheters, as neurointerventional devices, are a rapid, safe, and efficient thrombectomy technique, playing an important role in neurointerventional medicine. Compared to stent thrombectomy, direct aspiration reduces direct cutting and traction of the vascular endothelium, requires less surgical time, and is less expensive. Currently, direct aspiration thrombectomy is on par with stent thrombectomy in treating acute ischemic stroke caused by occlusion of the anterior circulation large vessels.

[0039] In the prior art, the thrombus aspiration catheter consists of a catheter hub and a suction tube. The tip of the thrombus aspiration catheter has a flat end (which can be understood as the end having an annular plane, i.e., the existing thrombus aspiration catheter has a flat end). During the aspiration process, larger thrombi are accelerated to the tip of the aspiration catheter under the suction force and vascular pressure. The thrombus clots will accumulate at the tip of the thrombus aspiration catheter, causing blockage of the tip of the aspiration catheter, resulting in difficulty or inability to aspirate.

[0040] Alternatively, it can be understood that the thrombus in the blood vessel is accompanied by a certain degree of hardening and clots. When the existing thrombus aspiration catheter is used for negative pressure aspiration, the hardened thrombus and clots suddenly come into contact with the tip of the thrombus aspiration catheter, which produces an aggregation effect and blocks the tip of the aspiration catheter. As a result, the thrombus in the blood vessel cannot be completely aspirated out of the body, affecting the progress of the operation.

[0041] Furthermore, when dealing with severely tortuous blood vessels, the permeability of thrombus aspiration catheters is of paramount importance. However, the flat tip of existing aspiration catheters can scrape against the vessel wall. In tortuous vessels, the flat tip of the thrombus aspiration catheter may even come into contact with the vessel wall on one side, forming a perpendicular contact with the tortuous vessel. Forcibly pushing the tip of the thrombus aspiration catheter will cause it to fold into an irregular cross-section (non-circular cross-section), damaging the inner wall of the vessel. This can even prevent the thrombus aspiration catheter from being pushed to the lesion site, or cause the soft segment of the tip of the thrombus aspiration catheter to bend and lose its function.

[0042] In view of this, please refer to Figures 1-7 The catheter tip 100 and aspiration catheter provided in the embodiments of this utility model can solve this problem, and will be described in detail below.

[0043] Please refer to this first. Figures 1-3 This utility model provides an aspiration catheter, which includes an aspiration tube 200, a catheter seat 300, and a catheter tip 100. The proximal end of the aspiration tube 200 is connected to the catheter seat 300, and the distal end of the aspiration tube 200 is connected to the proximal end of the catheter tip 100. This aspiration catheter has good passage in blood vessels and has a good aspiration effect.

[0044] Specifically, the catheter head 100 can be suitable for an aspiration catheter, the catheter head 100 has a ring-shaped suction port 111, part of the port structure of the ring-shaped suction port 111 is recessed towards the proximal end of the catheter head 100, so that the ring-shaped suction port 111 forms a concave port portion 1111.

[0045] Therefore, when the catheter head 100 is in contact with the thrombus 20, the ring-shaped suction port 111 will present irregular contact, the ring-shaped suction port 111 forms a concave port portion 1111, and the ring-shaped suction port 111 also forms a convex port portion 1112, which will first contact the thrombus 20, so that there is a gap between the thrombus 20 and the concave port portion 1111, and the thrombus 20 will not completely block the ring-shaped suction port 111, causing the thrombus to be completely aspirated out of the body. The situation that the thrombus cannot be completely aspirated into the body, and at the same time, the thrombus 20 will be gradually eroded and become smaller during the aspiration of the aspiration catheter.

[0046] In addition, this irregular contact will also have a certain cutting effect on the thrombus 20, that is, the convex port portion 1112 can cut the thrombus 20.

[0047] As can be seen, the catheter head 100 in the embodiment can reduce the situation that the negative pressure suddenly generated when the thrombus 20 is started to aspirate is gathered at the ring-shaped suction port 111, at the same time, the ring-shaped suction port 111 is equivalent to having an irregular contact surface, which can avoid the situation that the catheter head 100 is blocked during the aspiration process, thereby greatly avoiding the thrombus 20 from blocking the aspiration catheter, and improving the aspiration efficiency and aspiration success.

[0048] In addition, the contact area of the ring-shaped suction port 111 with the thrombus 20 will be larger than the contact area of the existing flat port aspiration catheter head 30 with the thrombus 20, and the aspiration of the aspiration catheter in the embodiment is stronger.

[0049] In the embodiment, the catheter head 100 is in a tubular structure, the proximal end port of the catheter head 100 has a ring-shaped plane, the distal end port of the catheter head 100 is a ring-shaped suction port 111, the proximal end port of the catheter head 100 is equivalent to a flat port shape, and the proximal end port of the catheter head 100 can be fixed by laser welding and the distal end of the suction tube 200.

[0050] It should be noted that in the present application, the terms "proximal end" and "distal end" are medical field terms, specifically, "distal end" means the end far from the operator during the operation process, and "proximal end" means the end close to the operator during the operation process, in addition, it should be noted that "distal end" can also be understood as "head end".

[0051] Specifically, the catheter seat 300 is a connecting piece made of a high polymer material (for example, a nylon material, and can also be a polypropylene PP, a polycarbonate PC, a polyethylene PE, etc.). One end of the catheter seat 300 is connected to the proximal end of the suction pipe 200 using a cured glue, and the other end of the catheter seat 300 is a standard size of a 6% standard luer female joint. The other end of the catheter seat 300 is an important part of connecting the suction catheter to the outside, and the negative pressure suction device is connected through the other end of the catheter seat 300 to transmit the pressure to the catheter head end 100, thereby realizing the suction operation of the thrombus 20.

[0052] It should be noted that in the present embodiment, the suction pipe 200 is a multi-layer composite pipe structure, and the suction pipe 200 is sequentially distributed with a PTFE layer, a metal wire wound spring layer, a metal wire woven layer, and a high polymer material outer pipe (for example, an outer pipe made of a nylon material) from inside to outside.

[0053] The friction coefficient of the PTFE layer is only 0.04, which can ensure that the thrombus 20 has good passability in the suction pipe 200. The metal wire wound spring layer has good support and flexibility, so that the suction catheter has bending resistance in the tortuous blood vessel. The metal wire woven layer is a grid-shaped woven mesh pipe interwoven by platinum-iridium alloy woven wires and stainless steel woven wires. The platinum-iridium alloy woven wires have good developing effect, which provides good realization effect for the path of the catheter in the blood vessel. The stainless steel woven wires have high strength and high toughness, which can make the woven mesh pipe maintain the circular pipe shape of the suction pipe 200 under torque and tension, and are not easy to bend and break. The grid structure of the grid-shaped woven mesh pipe can distribute the torque to the entire grid-shaped woven mesh pipe.

[0054] The hardness of the high polymer material outer pipe gradually decreases in the direction from the proximal end of the high polymer material outer pipe to the distal end of the high polymer material outer pipe. The low-hardness distal end of the high polymer material outer pipe is beneficial to the advancement of the suction catheter in the tortuous blood vessel, and the high-hardness proximal end of the high polymer material outer pipe is beneficial to the transmission of the pushing force, so that the suction catheter reaches the thrombus 20 position.

[0055] Please continue to refer to Figure 4 and combine Figure 3 At least two part port structures of the annular suction port 111 are recessed in the direction of the proximal end of the catheter head end 100, so that the annular suction port 111 forms at least two concave port portions 1111 and at least two convex port portions 1112.

[0056] Specifically, in the present embodiment, two part port structures of the annular suction port 111 are recessed in the direction of the proximal end of the catheter head end 100, so that the annular suction port 111 forms two concave port portions 1111 and two convex port portions 1112. The two concave port portions 1111 are spaced apart, and the two convex port portions 1112 are spaced apart.

[0057] It can be understood that the circumferential direction of the annular suction port 111 is sequentially distributed with one concave port portion 1111, one convex port portion 1112, one concave port portion 1111, and one convex port portion 1112.

[0058] Among them, the two concave port portions 1111 are symmetrically distributed, and the symmetrically distributed two concave port portions 1111 here can be understood as being symmetrically distributed about a first symmetry line, which is perpendicular to the axis of the catheter head end 100. It should be noted that the catheter head end 100 has a circular tube structure except for the structure of the annular suction port 111, and the axis of the circular tube structure can be understood as the axis of the catheter head end 100.

[0059] Therefore, from the perspective of Figure 3 , the catheter head end 100 is equivalent to having a C-shaped tube mouth.

[0060] But in this embodiment, the two convex port portions 1112 can be asymmetrically distributed, as shown in Figure 3 , the distance from the rightmost part of the convex port portion 1112 on the upper side (equivalent to the vertex of the convex port portion 1112) to the proximal end of the catheter head end 100 is a first distance, and the distance from the rightmost part of the convex port portion 1112 on the lower side (equivalent to the vertex of the convex port portion 1112) to the proximal end of the catheter head end 100 is a second distance. The first distance is less than the second distance.

[0061] Of course, in other embodiments, as shown in 7, while the two concave port portions 1111 are symmetrically distributed about the first symmetry line, the two convex port portions 1112 can be symmetrically distributed about a second symmetry line, which is symmetrically perpendicular to the axis of the catheter head end 100, and can also be perpendicular to the first symmetry line.

[0062] Of course, in other embodiments, the three part port structures of the annular suction port 111 can also be recessed towards the proximal end of the catheter head end 100, so that the annular suction port 111 forms three concave port portions 1111 and three convex port portions 1112.

[0063] In order to facilitate the understanding of the position and direction of travel of the suction catheter head end 100 in the blood vessel, the suction catheter further comprises a developing ring 400, which is arranged at the distal end of the suction tube 200. At the same time, the catheter head end 100 can be sleeved outside the distal end of the suction tube 200 and connected with the distal end of the suction tube 200, and the catheter head end 100 can cover the developing ring 400. The developing ring 400 can be an open circular ring structure.

[0064] In the embodiment, the developing ring 400 has a distal annular portion 401 which is parallel to the annular suction port 111, so that the position and direction of the suction catheter head 100 in the blood vessel can be clearly distinguished in the X-ray image.

[0065] The proximal end of the developing ring 400 is flat, i.e. the end face of the proximal end of the developing ring 400 is an annular plane, and the distal end face of the developing ring 400 is an annular curved surface.

[0066] The distance between the developing ring 400 and the annular suction port 111 can be 0.5-2 mm, for example, the distance between the developing ring 400 and the annular suction port 111 can be 0.5 mm or 2 mm or 1.2 mm.

[0067] In order to avoid damage to the blood vessel by the annular suction port 111, in the embodiment, the annular suction port 111 has a circular chamfer structure.

[0068] In addition, it should be noted that the annular suction port 111 in the embodiment can be understood as a ring structure, the distal end of the annular suction port 111 has two concave port portions 1111 and two convex port portions 1112, the proximal end of the annular suction port 111 is connected to the remaining pipe structure of the catheter head 100 except the annular suction port 111, the inner diameter of the remaining pipe structure of the catheter head 100 except the annular suction port 111 is equal to the inner diameter of the proximal end of the annular suction port 111, and the inner diameter of the proximal end of the annular suction port 111 can be understood as the inner diameter of the catheter head 100.

[0069] In addition, in order to facilitate the manufacture of the catheter head 100 in the embodiment, a catheter head 100 manufacturing method is also provided, specifically, the C-shaped pipe opening of the catheter head 100 can be manufactured by artificial cutting, and the catheter head 100 provided in the embodiment can be manufactured by a circular pipe structure (which can be understood as a circular hose). The circular hose is cut into a flat structure at one end and a C-shaped pipe opening at the other end to manufacture a head with a C-shaped opening (equivalent to the catheter head 100), and the length of the head with the C-shaped opening can be 8-10 mm.

[0070] The cut head with the C-shaped opening is sleeved on the distal end of the suction pipe 200 through the flat structure of the one end and completely covers the developing ring, the distance between the developing ring 400 and the annular suction port 111 is 0.5-2 mm, the distal annular portion 401 is parallel to the annular suction port 111, the support mandrel is sleeved in the suction pipe 200, the protective sleeve is sleeved on the head with the C-shaped opening, the suction pipe 200 and the head with the C-shaped opening are firmly welded by using a laser welding machine, and finally the protective sleeve is removed to complete the connection of the catheter head 100 and the suction pipe 200.

[0071] Please continue to refer to Figure 5 and Figure 6 Because the suction catheter provided in the embodiment has a C-shaped nozzle, it has better passability in the blood vessel than the suction catheter with a flat nozzle in the prior art.

[0072] Of course, Figure 5 and Figure 6 The blood vessels in the above can be understood as the simulation blood vessel 10.

[0073] Specifically, when encountering a tortuous structure of the blood vessel, the suction catheter is rotated so that the upper convex port portion 1112 first contacts the blood vessel wall. During the contact process, because the upper convex port portion 1112 and the lower convex port portion 1112 are distributed with the concave port portion 1111, the upper convex port portion 1112 is prone to deformation under force, that is, the head end of the upper convex port portion 1112 farthest end will naturally bend, driving the deflection of the soft head end of the entire catheter, so as to quickly pass through the tortuous part.

[0074] In the simulation blood vessel 10, the suction catheter with a C-shaped nozzle can pass through the C5-C7 section of the blood vessel smoothly or with light rotation of the suction catheter, while the existing suction catheter with a flat nozzle needs to be rotated and adjusted multiple times to pass through the C5-C7 section of the blood vessel with the flat nozzle, or is stuck in the C5-C7 section, the rear end is pushed to fold, and cannot be pushed through. Therefore, the suction catheter provided in the embodiment has excellent force value transmission and blood vessel passability.

[0075] In addition, according to the formula P=F / S, P is the suction pressure, S is the suction contact area, and F is the suction force. When the suction pressure P is constant, the suction force F will also increase accordingly when the suction contact area S of the catheter head end 100 increases.

[0076] Please refer to Figure 7 The catheter head end 100 in the embodiment and the flat nozzle suction catheter head end 30 in the prior art contact the thrombus 20 in the simulation blood vessel 10. The catheter head end 100 in the embodiment has a C-shaped nozzle, which increases the contact area between the catheter head end 100 and the thrombus 20.

[0077] Specifically, in the case where the inner diameter of the catheter head end 100 provided in the embodiment and the inner diameter of the flat nozzle suction catheter head end 30 in the prior art are both 1.80 mm, the suction contact area of the catheter head end 100 provided in the embodiment is 3.2 m 2 , and the suction contact area between the flat nozzle suction catheter head end 30 in the prior art and the thrombus 20 is 2.54 m 2 Therefore, the suction force of the catheter head end 100 of the suction catheter in the embodiment is greater than that of the flat nozzle suction catheter head end 30 in the prior art.

[0078] In summary, the catheter head 100 has an annular suction port 111, part of the port structure of the annular suction port 111 is recessed towards the proximal end of the catheter head 100, so that the annular suction port 111 forms a concave port part 1111.

[0079] Therefore, the annular suction port 111 of the catheter head 100 will present irregular contact when in contact with the thrombus 20, produce a certain cutting effect and wrapping effect on the thrombus 20, reduce the aggregation of the negative pressure suddenly generated when the thrombus 20 starts to be sucked at the annular suction port 111, the annular suction port 111 is equivalent to having an irregular contact surface, which can avoid the situation of blocking the catheter head 100 during the suction process, thereby greatly avoiding the thrombus 20 from blocking the suction catheter, improving the suction efficiency and suction success.

[0080] The suction catheter comprises a suction pipe 200, a catheter seat 300 and the catheter head 100 described above, the proximal end of the suction pipe 200 is connected with the catheter seat 300, and the distal end of the suction pipe 200 is connected with the proximal end of the catheter head 100, the suction catheter has all the functions of the catheter head 100 described above, specifically, the suction catheter has a unique C-shaped pipe opening structure design, which can better adapt to the bending and turning of the blood vessel, at the same time, the suction capacity is enhanced, and the thrombus 20 or other foreign matters can be effectively removed.

[0081] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An aspiration catheter, comprising: The suction catheter comprises a suction tube (200), a catheter seat (300) and a catheter head end, the proximal end of the suction tube (200) is connected with the catheter seat (300), and the distal end of the suction tube (200) is connected with the proximal end of the catheter head end; The catheter head end has a ring-shaped suction port (111), and part of the port structure of the ring-shaped suction port (111) is recessed towards the proximal end of the catheter head end, so that the ring-shaped suction port (111) forms a concave port part (1111); The suction catheter further comprises a developing ring (400), which is arranged at the distal end of the suction tube (200); the developing ring (400) has a distal end ring-shaped part (401), which is parallel to the ring-shaped suction port (111); The suction tube (200) is a multi-layer composite tube structure, and the suction tube (200) sequentially comprises a PTFE layer, a metal wire coiled spring layer, a metal wire woven layer and a high polymer material outer tube from inside to outside; The hardness of the high polymer material outer tube gradually decreases from the proximal end of the high polymer material outer tube to the distal end of the high polymer material outer tube.

2. The suction conduit of claim 1, wherein, At least two part port structures of the ring-shaped suction port (111) are recessed towards the proximal end of the catheter head end, so that the ring-shaped suction port (111) forms at least two concave port parts (1111) and at least two convex port parts (1112).

3. The suction conduit of claim 2, wherein, Two part port structures of the ring-shaped suction port (111) are recessed towards the proximal end of the catheter head end, so that the ring-shaped suction port (111) forms two concave port parts (1111) and two convex port parts (1112). The two concave port parts (1111) are spaced apart, the two convex port parts (1112) are spaced apart, and the two concave port parts (1111) are symmetrically distributed.

4. The suction conduit of claim 1, wherein, The ring-shaped suction port (111) has a ring-shaped circular chamfer structure.

5. The suction conduit of claim 1, wherein, The proximal end port of the catheter head end has a ring-shaped plane, and the distal end port of the catheter head end is a ring-shaped suction port (111).

6. The suction conduit of claim 1, wherein, The distance between the developing ring (400) and the ring-shaped suction port (111) is 0.5-2 mm.

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