Medical catheter

Abstract

The application provides a medical catheter, comprising: a catheter seat comprising a first communication interface and a second communication interface; a tube body, an inside of the tube body being provided with a suction channel and a liquid channel, a proximal end of the suction channel being in communication with the first communication interface, a distal end of the suction channel being open at a distal end of the tube body, a proximal end of the liquid channel being in communication with the second communication interface, and a distal end of the liquid channel being in communication with the distal end of the suction channel. By using the medical catheter, the thrombus suction efficiency is improved, and the medical catheter is suitable for removing thrombus of various shapes and textures.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a medical catheter. BACKGROUND

[0002] Vascular embolism has always been a serious threat to human health, especially cerebral vascular embolism, which is easy to cause patients to have limb dysfunction, even loss of labor capacity and inability to take care of themselves.

[0003] At present, mechanical thrombectomy is a common method for treating vascular embolism, that is, a cutting stent or a braided stent is used to capture the thrombus. However, this method has a series of problems: for example, it can produce microthrombi and cause distal vascular embolism; the stent is easy to cause endothelial injury in the process of release and thrombectomy, and even cause complications such as vascular spasm and dissection; the establishment of a guide catheter, an intermediate catheter, and a microcatheter is required for the delivery of the stent, and the delivery of the thrombectomy stent, which will prolong the operation time to a certain extent.

[0004] Catheter aspiration technology can improve the recanalization rate and shorten the recanalization time. Since aspiration thrombectomy does not need to pass through the thrombus, and does not need to operate at the distal end of the microcatheter and microguide wire, the use of aspiration technology is safe and effective, and the complications related to the instrument are lower than those of stent thrombectomy, and the treatment cost is also lower than that of stent thrombectomy.

[0005] However, the current aspiration technology also has certain defects. The components and forms of thrombus are different, including soft and fragile fresh thrombus rich in red blood cells, white thrombus rich in fibrin with high hardness, and even calcified thrombus and cardiogenic thrombus. The volume of different thrombi also varies, which will affect the aspiration effect and even directly cause the catheter to be unable to aspirate the thrombus out of the body. Therefore, the aspiration catheter in the prior art often has low aspiration efficiency due to small catheter diameter, large thrombus load, and hard thrombus texture, and the thrombus cannot be aspirated out of the body through the aspiration catheter, which seriously affects the treatment effect. This disadvantage is more obvious in the treatment of intracranial vascular embolism. First, due to the tortuous and small intracranial blood vessels, the inner cavity of the aspiration catheter is also correspondingly small, which directly affects the thrombus aspiration efficiency. In addition, due to the tortuous and small intracranial blood vessels, the aspiration catheter is difficult to reach the distal embolism site, and the catheter has poor positioning rate, which reduces the thrombus aspiration efficiency and also makes the intracranial vascular embolism often need to be treated by stent thrombectomy after aspiration to achieve good prognosis.

[0006] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0007] In view of the problems in the prior art, the present application aims to provide a medical catheter, which improves the thrombus suction efficiency and is suitable for removing thrombus of various shapes and textures.

[0008] The medical catheter provided by the present application comprises:

[0009] A catheter seat comprising a first communication interface and a second communication interface;

[0010] A tube body, an inner portion of the tube body being provided with a suction channel and a liquid channel, a proximal end of the suction channel being in communication with the first communication interface, a distal end of the suction channel being open at a distal end of the tube body, a proximal end of the liquid channel being in communication with the second communication interface, and a distal end of the liquid channel being in communication with the distal end of the suction channel.

[0011] In some embodiments, the suction channel and the liquid channel are straight channels extending along an axial direction of the tube body; or the suction channel is a straight channel extending along an axial direction of the tube body, and the liquid channel is a spiral channel.

[0012] In some embodiments, the tube body comprises an outer layer and an inner layer located inside the outer layer, and the suction channel and the liquid channel are both formed in the inner layer.

[0013] In some embodiments, the tube body further comprises a reinforcing layer located between the outer layer and the inner layer, and the reinforcing layer comprises at least one of a hypotube, a braided layer and a spiral layer.

[0014] In some embodiments, the tube body comprises an outer layer and an inner layer located inside the outer layer, the suction channel is formed in the inner layer, a reinforcing layer is arranged between the outer layer and the inner layer, and the liquid channel is formed in the reinforcing layer.

[0015] In some embodiments, the liquid channel is spirally arranged around the inner layer to form a spiral channel.

[0016] In some embodiments, the reinforcing layer comprises a braided layer and / or a spiral layer, the braided layer and / or the spiral layer are obtained by combining a hollow tube and a braided wire, and the liquid channel is an inner cavity of the hollow tube.

[0017] In some embodiments, the reinforcing layer comprises a braided layer, and the number of braided nodes per unit inch of the braided layer decreases sequentially from the proximal end to the distal end; and / or, the reinforcing layer comprises a spiral layer, and the number of spirals per unit inch of the spiral layer decreases sequentially from the proximal end to the distal end.

[0018] In some embodiments, a distal end of the tube body is provided with a developing component, and a distal end of the hollow tube is fixed to the developing component.

[0019] In some embodiments, the distal end of the hollow tube is provided with a liquid outlet hole, the liquid outlet hole is in communication with the suction channel, the developing component is provided with a developing component opening, and the developing component opening is in communication with the liquid outlet hole.

[0020] In some embodiments, the outer diameter of the tube body gradually decreases from the proximal end to the distal end; and / or, the hardness of the proximal end of the outer layer is greater than the hardness of the distal end of the outer layer.

[0021] In some embodiments, the radial dimension of the cross section of the suction channel is 0.03-0.14 inches, the radial dimension of the cross section of the liquid channel is 0.014-0.056 inches, and the outer diameter of the medical catheter is 0.07-0.17 inches.

[0022] In some embodiments, the distal end of the liquid channel is provided with a liquid outlet hole, the liquid outlet hole is in communication with the suction channel, the aperture of the liquid outlet hole is 0.002-0.01 inches, and the liquid pressure flowing out of the liquid outlet hole is 2-7 MPa.

[0023] In some embodiments, the cross section of the suction channel is a cashew shape, a fan shape or an arc shape, and the cross section of the liquid channel is a circular shape.

[0024] The medical catheter provided by the present application has the following advantages:

[0025] The medical catheter of the present application contains both a suction channel and a liquid channel. When a thrombus with a large load or a hard texture is sucked into the distal end of the suction channel, the liquid channel can provide high-speed fluid to impact the thrombus, so that the sucked thrombus is broken and deformed to change its shape, and the thrombus can be diluted, so that it is easier to be sucked out of the body through the suction channel. Therefore, the size of the thrombus that can be sucked by the medical catheter is not limited by the size of the inner diameter of the catheter, and the thrombus cannot be sucked out of the body due to the influence of the shape and structural components of the thrombus. The medical catheter of the present application can improve the success rate of thrombus suction, significantly improve the treatment effect, and expand the indication range. At the same time, the present application can reduce the requirement for the inner diameter of the suction channel, and thus a smaller outer diameter of the catheter can be set, so that the medical catheter is easier and more smoothly pushed to the distal end, and the pushing performance of the medical catheter is improved. Further, the medical catheter of the present application is additionally provided with a reinforcing layer, and the liquid channel can be opened in the reinforcing layer, so that the medical catheter can still have good bending resistance and oval resistance while being able to inject fluid and suck thrombus. BRIEF DESCRIPTION OF DRAWINGS

[0026] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments with reference to the following drawings.

[0027] Figure 1 is the schematic diagram of the overall structure of the medical catheter of the first embodiment of the present application;

[0028] Figure 2 is the schematic diagram of the layered tube of the medical catheter of the first embodiment of the present application;

[0029] Figure 3 is the schematic diagram of the cross section of the medical catheter of the first embodiment of the present application at the distal end liquid outlet hole;

[0030] Figure 4 is the schematic diagram of the use of the medical catheter of the first embodiment of the present application;

[0031] Figure 5 shows the schematic diagram of the use of the medical catheter of the first embodiment of the present application in partial enlargement;

[0032] Figure 6 is the schematic diagram of the overall structure of the medical catheter of the second embodiment of the present application;

[0033] Figure 7 is the schematic diagram of the layered tube of the medical catheter of the second embodiment of the present application;

[0034] Figure 8 is the schematic diagram of the cross section of the connection of the distal end of the spiral hollow tube and the developing component of the medical catheter of the second embodiment of the present application;

[0035] Figure 9 is the schematic diagram of the use of the medical catheter of the second embodiment of the present application;

[0036] Figure 10 is the schematic diagram of the use of the medical catheter of the second embodiment of the present application in partial enlargement.

[0037] Reference signs:

[0038] 10 medical catheter 1023 developing component

[0039] 101 catheter seat 1023a developing component opening hole

[0040] 101a second communication interface 102a outer layer

[0041] 101b first communication interface 102b reinforcing layer

[0042] 102 tube 1024 braided wire

[0043] 1021 suction channel 102c inner layer

[0044] 1022 liquid channel 103 blood vessel

[0045] 1022a liquid outlet hole 104 thrombus DETAILED DESCRIPTION

[0046] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings; however, the example embodiments can be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the specification. Any of the terms "and", "or", and "and / or" as used herein can either mean "and", or "or" or both "and" and "or". The term "between" as used herein should be interpreted as "and / or". Although the terms "first", "second", "third", etc. can be used herein to describe various example features, these features should not be limited by these terms since such terms are used only to distinguish one feature from another. The term "radial dimension" as used herein refers to the distance between the two most distant points in a cross section, for example, the diameter in the case of a circular cross section.

[0047] In the present disclosure, "proximal end" and "distal end" are relative to the operator, "proximal end" refers to the end close to the operator, and "distal end" refers to the end away from the operator, i.e. the end close to the surgical site, for example, in Figure 1 In the present disclosure, the proximal end of the tube body is the left end, and the distal end is the right end. "Axial" refers to the axial direction of the tube body, i.e. the horizontal direction from left to right in the perspective view of Figure 1 In the present disclosure, the proximal end of the tube body is the left end, and the distal end is the right end. "Axial" refers to the axial direction of the tube body, i.e. the horizontal direction from left to right in the perspective view of

[0048] To solve the technical problems in the prior art, the present disclosure provides a medical catheter, comprising a catheter seat and a tube body, the catheter seat is located on the proximal end side of the tube body, and the catheter seat comprises a first communication interface and a second communication interface. The inside of the tube body is provided with a suction channel and a liquid channel, the proximal end of the suction channel is in communication with the first communication interface, the proximal end of the liquid channel is in communication with the second communication interface, the distal end of the suction channel is open at the distal end of the tube body, and the distal end of the liquid channel is in communication with the suction channel. The first communication interface can provide negative pressure for the suction channel, so that the suction channel can suck thrombus, the second communication interface can provide liquid input for the liquid channel, and the position where the liquid channel communicates with the suction channel can spray high-speed fluid to impact the thrombus, so that the sucked thrombus is broken and deformed to change its shape, and the thrombus can be diluted, so as to be suitable for being sucked out of the body through the suction channel.

[0049] Therefore, this medical catheter is not limited by the size of its inner diameter and is not hindered by the morphology and structural composition of the thrombus, thus improving the success rate of thrombus aspiration and making it suitable for removing thrombi of various shapes and textures. Furthermore, this invention reduces the requirements for the inner diameter of the aspiration channel, allowing for a smaller outer diameter of the catheter, making it easier and smoother to push the medical catheter to the distal end, thereby improving the catheter's delivery performance.

[0050] The structure of the medical catheter in a specific embodiment is described below with reference to the accompanying drawings. It is understood that the drawings and the following description are merely examples and are not intended to limit the scope of protection of this invention.

[0051] Figures 1 to 5 The specific structure and usage of the medical catheter 10 according to the first embodiment of the present invention are shown. Figure 1 As shown, in the first embodiment of the present invention, the medical catheter 10 includes a catheter seat 101 and a tube body 102. The catheter seat 101 is a Y-shaped seat located on the proximal side of the tube body 102. The catheter seat 101 includes a first connecting interface 101b and a second connecting interface 101a. The tube body 102 has an aspiration channel 1021 and a liquid channel 1022 inside. The proximal end of the aspiration channel 1021 is connected to the first connecting interface 101b, and the distal end of the aspiration channel 1021 opens at the distal end of the tube body 102. The proximal end of the liquid channel 1022 is connected to the second connecting interface 101a, and the distal end of the liquid channel 1022 is provided with a liquid outlet 1022a, which is connected to the aspiration channel 1021.

[0052] The first connecting interface 101b can provide negative pressure to the suction channel 1021, allowing the suction channel 1021 to aspirate the thrombus 104. The second connecting interface 101a can provide liquid input to the liquid channel 1022. A high-speed fluid can be ejected from the liquid channel 1022, which connects to the suction channel 1021, to impact the thrombus 104, causing it to break and deform, thus changing its shape. The fluid can also dilute the thrombus, making it suitable for extraction through the suction channel 1021. Therefore, this medical catheter 10 is not limited by the inner diameter of the catheter and will not be unable to extract the thrombus 104 due to its shape or structural composition, thereby improving the success rate of thrombus 104 aspiration and making it suitable for removing thrombi 104 of various shapes and textures.

[0053] like Figure 1As shown, in this embodiment, the tube body 102 is formed as a double-lumen tube, the suction channel 1021 and the liquid channel 1022 are straight channels extending along the axial direction of the tube body 102, and the suction channel 1021 and the liquid channel 1022 respectively extend through the tube body 102 along the axial direction. The distal end of the tube body 102 is provided with a developing component 1023 indicating the position of the distal end of the tube body 102, which is, for example, a developing ring, or a developing strip or other shapes.

[0054] In this embodiment, the outer diameter of the tube body 102 gradually decreases from the proximal end to the distal end, so as to gradually improve the flexibility of the tube body 102 from the proximal end to the distal end, and can improve the ability of the tube body 102 to access the small blood vessels 103 (such as the intracranial distal small blood vessels 103). As shown, Figure 2 As shown, the tube body 102 comprises, from outside to inside, an outer layer 102a, a reinforcing layer 102b and an inner layer 102c. The proximal end hardness of the outer layer 102a is greater than the distal end hardness, and preferably gradually decreases from the proximal end to the distal end, for example, gradually decreases from 72D to 55A. By the greater hardness of the proximal end of the outer layer 102a, the bending resistance and pushing performance of the proximal end of the tube body 102 are ensured, and by the smaller hardness of the distal end of the outer layer 102a, the flexibility of the distal end of the tube body 102 is improved, so that the tube body 102 is more easily to reach the tortuous lesion blood vessels 103. The material of the outer layer 102a can be TPU (thermoplastic polyurethane elastomer rubber), Nylon, Pebax and other medical polymer materials. The reinforcing layer 102b can include one or more layers of material. The reinforcing layer 102b can improve the bending resistance, oval resistance and other capabilities of the tube body 102, and also can realize the transition of the overall hardness of the tube body 102 from the proximal end to the distal end, and even improve the tensile resistance and other properties of the catheter. The multi-layer material of the reinforcing layer 102b can include one or more of braided layer, spiral layer, hypotube. The hypotube is a long metal tube with micro-engineering features on the entire tube. The surface of the hypotube can be engraved with patterns. The braided wire 1024 or hypotube used in the braided layer and / or spiral layer can use stainless steel, nickel-titanium and other metal materials, or LCP (liquid crystal polymer), PI (polyimide), aramid, polyester and other medical polymer materials.

[0055] As shown, Figure 2As shown, the embodiment takes the spiral layer as an example. In the spiral layer, one or more braided wires are spirally wound outside the inner layer 102c to form a spiral structure, and the number of spirals per unit inch of the spiral structure decreases from the proximal end to the distal end, so as to improve the hardness of the proximal end and the flexibility of the distal end, ensure the bending resistance and pushing performance of the proximal end of the tube body 102, and easily reach the tortuous lesion blood vessel 103 by improving the flexibility of the distal end of the tube body 102. Similarly, when the reinforcing layer 102b includes a hypotube, the hardness of the hypotube decreases from the proximal end to the distal end. When the reinforcing layer 102b includes a braided layer, the PPI (number of braided nodes per unit inch) of the braided structure decreases from the proximal end to the distal end. These two ways can also ensure the bending resistance and pushing performance of the proximal end of the tube body 102, and make the tube body 102 easily reach the tortuous lesion blood vessel 103.

[0056] The material of the inner layer 102c can be a medical polymer material with high pressure resistance such as Pebax (nylon elastomer), PET (polyethylene terephthalate), or a medical polymer material with low friction coefficient such as PTFE (polytetrafluoroethylene), FEP (fluoroethylene propylene copolymer), HDPE (high density polyethylene), POM (polyoxymethylene), so as to reduce the frictional resistance when the delivery instrument or the suction thrombus 104 is used. For example, Figure 3 As shown, the suction channel 1021 and the liquid channel 1022 are both arranged in the inner layer 102c. The cross section of the suction channel 1021 is fan-shaped, and the cross section of the liquid channel 1022 is circular. A liquid outlet hole 1022a is arranged at the distal end of the suction channel 1021 and the distal end of the liquid channel 1022, and the liquid outlet hole 1022a is in communication with the suction channel 1021 and the liquid channel 1022 at the same time. In Figure 3In the shown cross section, the cross section of the liquid outlet hole 1022a is an axisymmetric figure, the angle between the two sides and the central axis is α, the size of the angle α can be determined according to the inner diameter of the liquid channel 1022, the required speed when the liquid rushes out of the liquid outlet hole 1022a, etc. The distance between the liquid outlet hole 1022a of the liquid channel 1022 and the farthest end of the liquid channel 1022 is 0.01 inch-0.03 inch, or it can also be set at the farthest end of the liquid channel 1022. The hole diameter of the liquid outlet hole 1022a is smaller than the inner diameter of the liquid channel 1022a, so that the liquid has a higher speed when passing through the liquid outlet hole 1022a from the liquid channel 1022a. The liquid outlet hole 1022a is connected to the suction channel 1021, the radial dimension of the cross section of the suction channel is 0.03 inch-0.14 inch. The radial dimension of the cross section of the liquid channel 1022 is 0.014 inch-0.056 inch. The outer diameter of the medical catheter is 0.07 inch-0.17 inch. The hole diameter of the liquid outlet hole 1022a can be 0.002 inch-0.01 inch, and the liquid pressure flowing out of the liquid outlet hole is 2Mpa-7Mpa. The sizes listed here are only examples, and the present application is not limited thereto. In other embodiments, the distance between the liquid outlet hole 1022a and the farthest end of the liquid channel 1022, the inner diameter of the suction channel 1021, the inner diameter of the liquid channel 1022, the outer diameter and the hole diameter of the liquid outlet hole 1022a can be selected and set as needed.

[0057] The following will be described in conjunction with Figure 4 and Figure 5The method of using the medical catheter 10 in this embodiment is described in detail. After the long sheath or guiding catheter enters the human body through the femoral artery, the medical catheter 10 of this embodiment, together with the microcatheter and guidewire, is used to reach the occlusion position of the blood vessel 103 via a coaxial alternating ascending technique. The microcatheter and guidewire are then withdrawn, and the second connecting port 101a is connected to an external liquid, which can be physiological saline, heparinized physiological saline, thrombolytic drugs, etc. The first connecting port 101b is connected to an external negative pressure source (such as a suction pump, syringe, etc.). The external negative pressure source continuously generates negative pressure on the suction channel 1021 through the first connecting port 101b, and the suction channel 1021 absorbs the thrombus 104 to its distal end. Simultaneously, external fluid flows into the liquid channel 1022 through the second connecting interface 101a, continuously generating fluid pressure. After being throttled by the distal outlet 1022a, the fluid is sprayed at high pressure and high speed from the liquid channel 1022 through the outlet 1022a to the distal end of the suction channel 1021. It impacts the thrombus 104 that has been sucked into the suction channel 1021 by the external negative pressure, causing the sucked thrombus 104 to break and deform instantly. The thrombus 104 becomes small and is easily extracted from the body by the negative pressure in the suction channel 1021 after being diluted by the liquid. Meanwhile, a portion of the thrombus 104, which is larger than the inner diameter of the suction channel 1021, located in the blood vessel 103 will be stuck at the distal end of the tube 102. This portion of the thrombus 104 will be deformed and broken by the high-speed, high-pressure external fluid, and then extracted from the body through the suction channel 1021 under negative pressure. This process is repeated until all the thrombus 104 in the occluded blood vessel 103 is extracted from the body, thus achieving the therapeutic goal of opening the occluded blood vessel 103.

[0058] Figures 6 to 10 The specific structure and usage of the medical catheter 10 according to the second embodiment of the present invention are shown. Figure 6 As shown, in the second embodiment, the medical catheter 10 includes a catheter seat 101 and a tube body 102. The catheter seat 101 is a Y-shaped seat located on the proximal side of the tube body 102. The tube body 102 includes a suction channel 1021 and a spiral channel. The suction channel 1021 is a straight channel extending along the axial direction of the tube body 102 and penetrating the tube body 102 along the axial direction. The liquid channel 1022 is a spiral channel, and the liquid channel 1022 spirally penetrates the tube wall of the tube body 102. The spiral structure of the spiral channel also penetrates the tube body 102 along the axial direction.

[0059] like Figure 6As shown, the catheter seat 101 comprises a first communication interface 101b and a second communication interface 101a. The proximal end of the suction channel 1021 is in communication with the first communication interface 101b, and the suction channel 1021 is provided with negative pressure through the first communication interface 101b to achieve thrombus suction. The distal end of the suction channel 1021 is open at the distal end of the tube body 102. The proximal end of the liquid channel 1022 is in communication with the second communication interface 101a, and liquid can be injected into the liquid channel 1022 through the second communication interface 101a. The distal end of the liquid channel 1022 is provided with a liquid outlet hole 1022a, which is in communication with the suction channel 1021, and the hole diameter of the liquid outlet hole 1022a is smaller than the inner diameter of the liquid channel 1022, so that the liquid throttles and has a higher speed when passing through the liquid outlet hole 1022a from the liquid channel 1022, so that the liquid in the liquid channel 1022 can enter the distal end of the suction channel 1021 at high speed and high pressure through the liquid outlet hole 1022a to impact and dilute the thrombus. The distal end of the tube body 102 is provided with a developing component 1023, which can be a developing ring or other shapes such as a developing strip.

[0060] In this embodiment, the outer diameter of the tube body 102 gradually decreases from the proximal end to the distal end, so as to gradually increase the flexibility of the tube body 102 from the proximal end to the distal end, and can improve the ability of the catheter to access small blood vessels 103 (such as intracranial distal small blood vessels 103). As shown in the figure, the outer diameter of the tube body 102 gradually decreases from the proximal end to the distal end, and the outer diameter of the tube body 102 at the distal end is smaller than the outer diameter of the tube body 102 at the proximal end. Figure 6As shown, the tube body 102 comprises an outer layer 102a, a reinforcing layer 102b and an inner layer 102c arranged from outside to inside. The proximal end hardness of the outer layer 102a is greater than the distal end hardness, and preferably gradually decreases from the proximal end to the distal end, for example gradually decreases from 72D to 55A. The lower hardness of the proximal end of the outer layer 102a ensures the bending resistance and push performance of the proximal end of the tube body 102, while the higher hardness of the distal end of the outer layer 102a improves the flexibility of the distal end of the tube body 102, so that the tube body 102 is easier to reach the tortuous lesion blood vessel 103. The material of the outer layer 102a can be TPU (thermoplastic polyurethane elastomer rubber), Nylon, Pebax, etc. Medical polymer materials. The reinforcing layer 102b can include one or more layers of material. The reinforcing layer 102b can improve the bending resistance, oval resistance, etc. of the tube body 102, while also achieving the transition of the overall hardness of the tube body 102 from the proximal end to the distal end, and even improve the tensile resistance, etc. of the tube body 102. The multi-layer material of the reinforcing layer 102b can include one or more of a braided layer, a spiral layer, and a hypotube. The surface of the hypotube can be engraved with a pattern. The braided wire 1024 used in the braided layer and / or spiral layer or the hypotube can use stainless steel, nickel-titanium, etc. Metal materials, or LCP (liquid crystal polymer), PI (polyimide), aramid, polyester, etc. Medical polymer materials.

[0061] When the reinforcing layer 102b includes a spiral layer, at least one braided wire is spirally wound on the outside of the inner layer 102c to form a spiral structure, and the PPI (number of spirals per unit inch) of the spiral structure decreases from the proximal end to the distal end to improve the hardness of the proximal end and the flexibility of the distal end, ensure the bending resistance and push performance of the proximal end of the tube body 102, and make the tube body 102 easy to reach the tortuous lesion blood vessel 103. Similarly, when the reinforcing layer 102b includes a hypotube, the hardness of the hypotube decreases from the proximal end to the distal end. When the reinforcing layer 102b includes a braided layer, the number of braided nodes per unit inch of the braided structure decreases from the proximal end to the distal end. Both of these methods can ensure the bending resistance and push performance of the proximal end of the tube body 102, and make the tube body 102 easy to reach the tortuous lesion blood vessel 103.

[0062] As Figure 7As shown, the reinforcing layer 102b in this embodiment comprises a spiral layer formed by helically winding a hollow tube and a braided wire 1024 outside the inner layer 102c. The liquid channel 1022 is formed inside the hollow tube, so that the liquid channel 1022 is helically wound outside the inner layer 102c. The number of spirals per inch of the spiral layer decreases from the proximal end to the distal end, so as to improve the stiffness of the proximal end and the flexibility of the distal end of the tube body 102. The material of the hollow tube can be the same as or different from that of the braided wire 1024, such as stainless steel, nickel-titanium, or LCP (liquid crystal polymer), PI (polyimide), aramid, polyester, and other medical polymer materials. In another embodiment, the reinforcing layer 102b can also comprise a combination of a braided layer formed by braiding the braided wire and a spiral layer formed by helically winding the hollow tube, for example, the hollow tube is helically wound outside the inner layer 102c, the braided wire is braided to form a braided layer, the braided layer is wrapped outside the spiral-shaped hollow tube, and the number of braided nodes per inch of the braided layer decreases from the proximal end to the distal end, so as to improve the stiffness of the proximal end and the flexibility of the distal end of the tube body 102.

[0063] As shown in Figure 8 The developing component 1023 is a developing ring. The developing ring is provided with a developing component opening 1023a. The distal end of the hollow tube is in communication with the developing component opening 1023a on the developing component 1023, that is, the distal end liquid outlet hole 1022a of the hollow tube is fixed on the developing component opening 1023a and is in communication with the suction channel 1021. Thus, when a continuous high-speed fluid is injected into the hollow tube through the second communication interface 101a, the distal end liquid outlet hole 1022a of the hollow tube is fixed on the developing component 1023, so that the phenomenon of instability due to the small stiffness of the outer layer 102a at the distal end does not occur, and the effect of thrombus 104 removal is not affected by the instability of the distal end of the tube body 102. The inner diameter of the hollow tube is 0.014-0.04 inches, and the outer diameter is 0.03-0.056 inches. The inner diameters of the liquid outlet hole 1022a and the suction channel 1021 can be the same as those in the first embodiment, but are not limited thereto, and other values can be used according to clinical needs. The material of the inner layer 102c can be Pebax (nylon elastomer), PET (polyethylene terephthalate), and other medical polymer materials with high pressure resistance, or PTFE (polytetrafluoroethylene), FEP (fluoroethylene propylene copolymer), HDPE (high-density polyethylene), POM (polyoxymethylene), and other medical polymer materials with low friction coefficient, so as to reduce the frictional resistance when the delivery device or the suction thrombus 104 is used.

[0064] The following will be described in detail Figure 9 and Figure 10The use method of the medical catheter 10 of the embodiment is specifically introduced. After the long sheath or guide catheter enters the human body through the femoral artery, the medical catheter 10 of the embodiment is used to reach the occlusion position of the blood vessel 103 by the coaxial alternating ascending technology of the microcatheter and the guide wire, the microcatheter and the guide wire are withdrawn, the second communication interface 101a is connected with the external liquid, and the external liquid can be normal saline, heparinized normal saline, thrombolytic drugs and the like. The first communication interface 101b is connected with an external negative pressure source (such as a suction pump, a syringe and the like). The external negative pressure source continuously generates negative pressure through the first communication interface 101b to the suction channel 1021, and the suction channel 1021 absorbs the thrombus 104 to the distal end thereof. At the same time, the external fluid flows into the liquid channel 1022 through the second communication interface 101a, and continuously generates fluid pressure, and the fluid is jetted from the liquid channel 1022 to the distal end of the suction channel 1021 through the liquid outlet hole 1022a at high pressure and high speed after throttling of the liquid outlet hole 1022a at the distal end, and impacts the thrombus 104 sucked into the suction channel 1021 by the external negative pressure, so that the thrombus 104 sucked in instantaneously breaks and deforms, and the thrombus 104 becomes small and is easily sucked out of the body by the negative pressure in the suction channel 1021 after being diluted by the liquid. At the same time, the part of the thrombus 1021 with a larger inner diameter than the suction channel 1021 in the blood vessel 103 is clamped at the distal end of the pipe body 102, and this part of the thrombus 104 is deformed and broken by the high-speed and high-pressure external fluid, and is sucked out of the body by the suction channel 1021 through the negative pressure, and the reciprocating operation is continued until the thrombus 104 in the occluded blood vessel 103 is completely sucked out of the body, so as to achieve the treatment purpose of opening the occluded blood vessel 103.

[0065] The above is a further detailed description of the present application in combination with a specific preferred embodiment, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, some simple deductions or replacements can be made without departing from the concept of the present application, and all of them should be regarded as falling within the protection scope of the present application.

Claims

1. A medical catheter, characterized in that, The medical catheter comprises: a catheter seat comprising a first communication interface and a second communication interface; a catheter body, an inner part of the catheter body being provided with a suction channel and a liquid channel, a proximal end of the suction channel being in communication with the first communication interface, a distal end of the suction channel being open at a distal end of the catheter body, a proximal end of the liquid channel being in communication with the second communication interface, and a distal end of the liquid channel being in communication with the distal end of the suction channel; the catheter body comprising an inner layer and a reinforcing layer, the reinforcing layer being located outside the inner layer, the reinforcing layer being obtained by combining a hollow tube and a braided wire, the liquid channel being an inner cavity of the hollow tube, and the liquid channel being spirally arranged around the inner layer to form a spiral channel; wherein a developing component is arranged at the distal end of the catheter body, and a distal end of the hollow tube is fixed to the developing component.

2. The medical catheter of claim 1, wherein, The suction channel is a straight channel extending along an axial direction of the catheter body.

3. The medical catheter of claim 2, wherein, The catheter body further comprises an outer layer, and the reinforcing layer is located between the outer layer and the inner layer, and the suction channel is arranged in the inner layer.

4. The medical catheter of claim 3, wherein, The reinforcing layer comprises at least one of a braided layer and a spiral layer, and the braided layer and / or the spiral layer is obtained by combining the hollow tube and the braided wire.

5. The medical catheter of claim 4, wherein, The number of braided nodes per unit inch of the braided layer decreases from the proximal end to the distal end; and / or, the number of spirals per unit inch of the spiral layer decreases from the proximal end to the distal end.

6. The medical catheter of claim 1, wherein, A liquid outlet hole is arranged at the distal end of the hollow tube, the liquid outlet hole being in communication with the suction channel, and a developing component opening is arranged on the developing component, the developing component opening being in communication with the liquid outlet hole.

7. The medical catheter of claim 3, wherein, An outer diameter of the catheter body gradually decreases from the proximal end to the distal end; and / or, a hardness of the proximal end of the outer layer is greater than a hardness of the distal end of the outer layer.

8. The medical catheter of claim 1, wherein, A radial dimension of a cross section of the suction channel is 0.03 inch-0.14 inch, a radial dimension of a cross section of the liquid channel is 0.014 inch-0.056 inch, and an outer diameter of the medical catheter is 0.07 inch-0.17 inch.

9. The medical catheter of claim 1, wherein, A liquid outlet hole is arranged at the distal end of the liquid channel, the liquid outlet hole being in communication with the suction channel, a hole diameter of the liquid outlet hole is 0.002 inch-0.01 inch, and a liquid pressure flowing out of the liquid outlet hole is 2 Mpa-7 Mpa.

10. The medical catheter of claim 1, wherein, The cross section of the suction channel is a cashew shape, a fan shape or an arc shape, and the cross section of the liquid channel is a circular shape.

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