CN117064490A - suction catheter - Google Patents

Abstract

The application is suitable for the technical field of medical appliances, and provides a suction catheter. The suction catheter comprises a proximal portion and a distal portion arranged on one side of the proximal portion, the distal portion comprises a guide assembly and a steering assembly, the steering assembly is arranged between the guide assembly and the proximal portion, the guide assembly comprises a guide outer tube, the steering assembly comprises a steering outer tube, the guide outer tube is communicated with the steering outer tube, the elastic modulus of the guide outer tube is larger than that of the steering outer tube, the proximal portion is provided with a proximal passage, and the proximal passage is communicated with the steering outer tube. The suction catheter of the application is not only convenient for the distal end part of the suction catheter to smoothly pass through the bifurcation of the blood vessel, but also reduces the damage of the distal end part of the suction catheter to the inner wall of the blood vessel, thereby being beneficial to the recovery of patients.

Description

Suction catheter

Technical Field

The application belongs to the technical field of medical instruments, and particularly relates to a suction catheter.

Background

The cerebral apoplexy is commonly called as "apoplexy" or "cerebral infarction", and is an acute cerebrovascular disease in which cerebral tissue is damaged due to the fact that blood cannot be normally supplied to the brain due to sudden rupture of cerebral nerve blood vessels or blood vessel blockage, and comprises ischemic stroke and hemorrhagic stroke, wherein the ischemic stroke is the disease with the highest incidence rate of the cerebral apoplexy at present.

The most common treatment for ischemic stroke is intracranial arterial thrombosis, which is performed by accessing an intracranial vessel through a femoral artery access using a suction catheter to aspirate thrombus from the intracranial vessel. Intracranial blood vessels are complex and fragile blood vessel parts of human bodies, the inner walls of the blood vessels are fragile, and the bifurcation of the blood vessels is more; when the distal end portion of the suction catheter moves to the bifurcation of the intracranial vessel, the distal end portion of the suction catheter may collide with the inner wall of the vessel bifurcation, in which case the distal end portion of the suction catheter may damage the inner wall of the vessel and be difficult to enter into the target vessel, in order to enable the distal end portion of the suction catheter to be inserted into the target vessel, it is necessary to continuously push the suction catheter to insert toward the distal end of the vessel, but with the insertion of the suction catheter, the distal end portion of the suction catheter may push the inner wall of the vessel in contact therewith to move away from the vessel bifurcation. In this process, the distal end portion of the aspiration catheter is likely to cause damage to the inner wall of the blood vessel, and even adverse events such as rupture of the blood vessel, dissection and the like may occur, so that serious complications are caused, and even if the distal end portion of the aspiration catheter is likely to not complete steering, the steering and in-place of the aspiration catheter can be completed only through experience of a doctor and the assistance of other surgical instruments, so that not only the golden window period of the operation is wasted, but also new risks are increased to the operation due to the use of various surgical instruments.

Disclosure of Invention

The embodiment of the application aims to provide a suction catheter, which aims to solve the technical problem that the suction catheter in the prior art is not easy to pass through at the bifurcation of a blood vessel.

In order to achieve the above object, according to one aspect of the present application, there is provided a suction catheter including a proximal portion and a distal portion provided at one side of the proximal portion, the distal portion including a guide assembly and a steering assembly, the steering assembly being provided between the guide assembly and the proximal portion, the guide assembly including a guide outer tube, the steering assembly including a steering outer tube, the guide outer tube being in communication with the steering outer tube, the guide outer tube having an elastic modulus greater than that of the steering outer tube, the proximal portion having a proximal passage, the proximal passage being in communication with the steering outer tube.

Optionally, the guiding assembly further comprises a guiding inner tube, the guiding outer tube is sleeved on the outer peripheral surface of the guiding inner tube, the steering assembly further comprises a steering inner tube, the steering outer tube is sleeved on the outer peripheral surface of the steering inner tube, and the steering inner tube is communicated with the guiding inner tube.

Optionally, the guide assembly further comprises an expansion ring, the expansion ring is coaxial with the guide inner tube and embedded in the guide inner tube, and the outer diameter of the expansion ring is larger than the inner diameter of the guide inner tube, so that an expansion plane is formed on the outer peripheral surface of the guide outer tube.

Optionally, the end face, far away from the end of the steering inner tube, on the expansion ring is located on one side, close to the steering inner tube, of the end face, far away from the end of the steering inner tube, on the guiding inner tube, so that a guiding inclined plane, located on one side, far away from the steering assembly, of the expansion plane is formed on the outer peripheral surface of the guiding outer tube, and the guiding inclined plane gradually inclines towards the direction, close to the guiding inner tube, from one end, close to the expansion plane, to one end, far away from the expansion plane.

Optionally, the inner wall surface of the guide inner tube is formed as a flaring slope on a side of the expansion ring away from the steering inner tube, the flaring slope gradually sloping in a direction approaching the guide outer tube from an end approaching the expansion ring to an end departing from the expansion ring.

Optionally, the steering assembly further comprises a reinforced elastic ring, the reinforced elastic ring is sleeved on the outer peripheral surface of the steering inner tube, and the steering outer tube is sleeved on the outer peripheral surface of the reinforced elastic ring.

Optionally, the proximal portion includes a proximal inner tube and a proximal outer tube, the proximal outer tube is sleeved on an outer peripheral surface of the proximal inner tube, the proximal outer tube is communicated with the steering outer tube, the proximal outer tube is formed as a proximal passage, and the proximal inner tube is communicated with the steering inner tube.

Optionally, the guiding assembly further comprises a balloon and a trachea, the balloon is sleeved on the outer peripheral surface of the guiding inner tube, the guiding outer tube is sleeved on the outer peripheral surface of the balloon, the first end of the trachea is communicated with the balloon, and the second end of the trachea sequentially extends out of the suction catheter through a gap between the steering inner tube and the steering outer tube and a gap between the proximal inner tube and the proximal inner tube.

Optionally, the suction catheter further comprises a stabilizing component, the stabilizing component is arranged on one side, far away from the guiding component, of the steering component, the stabilizing component comprises a stabilizing outer tube, a first end of the stabilizing outer tube is communicated with the steering outer tube, a second end of the stabilizing outer tube is communicated with the proximal end channel, the elastic modulus of the stabilizing outer tube is greater than that of the steering outer tube, and the maximum outer diameter of the stabilizing outer tube is greater than or equal to that of the steering outer tube.

Optionally, the stabilizing assembly further comprises a stabilizing inner tube, wherein the stabilizing inner tube is communicated with the steering inner tube and the proximal inner tube, and the stabilizing outer tube is sleeved on the outer peripheral surface of the stabilizing inner tube; the stabilizing assembly further comprises a supporting ring which is coaxial with the stabilizing inner tube and embedded in the stabilizing inner tube, and the outer diameter of the supporting ring is larger than or equal to the inner diameter of the stabilizing inner tube; or, the stabilizing assembly further comprises a stabilizing reinforcing ring, the stabilizing reinforcing ring is sleeved on the outer peripheral surface of the stabilizing inner tube, and the stabilizing outer tube is sleeved on the outer peripheral surface of the stabilizing reinforcing ring.

The suction catheter provided by the application has the beneficial effects that: compared with the prior art, when the thrombus in the intracranial vessel of a patient needs to be sucked, an operating doctor inserts the distal end part of the suction catheter into the intracranial vessel of the patient through the pushing force of the proximal end part applied to the suction catheter, then the operating doctor can control the steering of the distal end part by manipulating the proximal end part, along with the continuous insertion of the suction catheter, the distal end part moves to the bifurcation of the intracranial vessel, according to corresponding image data, the operating doctor pushes the distal end part to insert towards the target vessel according to actual requirements, under the guiding action of the guiding outer tube, the end face of the guiding outer tube, which is far away from one end of the steering outer tube, contacts with the wall of the target vessel, then the operating doctor continuously pushes the distal end part to insert towards the vessel, and because the elastic modulus of the steering outer tube is smaller than that of the guiding outer tube, the pushing force applied to the distal end part by the steering outer tube can be absorbed by the steering outer tube, at the moment, the pushing force applied to the inner wall of the vessel by the guiding outer tube can be weakened, and meanwhile, under the bending steering action of the steering outer tube, the pushing force absorbed by the steering outer tube can be converted into the bending force, so that the steering outer tube can be started, under the condition that the bending direction of the steering outer tube, the steering outer tube is turned towards the direction of the target vessel, and the direction of the end face of the end of the guiding outer tube can be smoothly inserted towards the target vessel, and the suction tube can be smoothly and turned towards the direction of the inside of the target vessel. By adopting the suction catheter, the distal end part of the suction catheter can smoothly pass through the vascular bifurcation, and the damage of the distal end part of the suction catheter to the inner wall of the blood vessel is reduced, so that the recovery of a patient is facilitated.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a suction catheter with a guide assembly, a steering assembly, and a stabilizing assembly according to an embodiment of the present application;

FIG. 2 is a schematic view of a suction catheter with a guide assembly and a steering assembly according to an embodiment of the present application;

FIG. 3 is a schematic cross-sectional view of a distal portion with a steering assembly, and a stabilizing assembly provided in accordance with an embodiment of the present application, with the balloon in a contracted state;

FIG. 4 is a schematic cross-sectional view of a distal portion with a steering assembly, and a stabilizing assembly provided in accordance with an embodiment of the present application, with the balloon in an inflated state;

FIG. 5 is a schematic structural view of a reinforced elastic ring according to an embodiment of the present application;

FIG. 6 is an enlarged schematic view of FIG. 1 at A;

FIG. 7 is a schematic front view of a proximal portion provided by an embodiment of the present application;

FIG. 8 is a schematic structural view of a stability reinforcing ring according to an embodiment of the present application;

FIG. 9 is a schematic view of a distal portion with a steering assembly, and a stabilizing assembly provided in accordance with an embodiment of the present application in a contracted state of the balloon and at a vascular bifurcation;

FIG. 10 is a schematic view of a distal portion with a guide assembly, a steering assembly, and a stabilizing assembly provided in an embodiment of the present application with a balloon in an inflated state and in a vessel to be inserted;

reference numerals related to the above figures are as follows:

100. a proximal portion; 110. a proximal outer tube; 120. a proximal inner tube; 130. a proximal reinforcing ring; 200. a distal end portion; 210. a guide assembly; 211. a guide outer tube; 2111. expanding the plane; 2112. a guide slope; 212. a guide inner tube; 2121. flaring inclined plane; 213. an expansion ring; 214. a balloon; 215. an air pipe; 220. a steering assembly; 221. turning to an outer tube; 222. a steering inner tube; 223. reinforcing the elastic ring; 230. a stabilizing assembly; 231. stabilizing the outer tube; 232. stabilizing the inner tube; 233. a bracing ring; 234. stabilizing the reinforcing ring.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. Embodiments of the application and features of the embodiments may be combined with each other without conflict. The application will be described in detail below with reference to the drawings in connection with embodiments.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1 to 4 and 9, in order to solve the above problems, according to an aspect of the present application, an embodiment of the present application provides a suction catheter including a proximal portion 100 and a distal portion 200 provided at one side of the proximal portion 100, the distal portion 200 including a guide assembly 210 and a steering assembly 220, the steering assembly 220 being provided between the guide assembly 210 and the proximal portion 100, the guide assembly 210 including a guide outer tube 211, the steering assembly 220 including a steering outer tube 221, the guide outer tube 211 being in communication with the steering outer tube 221, the guide outer tube 211 having an elastic modulus greater than that of the steering outer tube 221, the proximal portion 100 having a proximal passage, the proximal passage being in communication with the steering outer tube 221.

In the embodiment of the present application, the outer steering tube 221 and the outer guiding tube 211 are coaxially arranged, the outer guiding tube 211 may be made of Pebax (chinese name: polyether block polyamide) with high elastic modulus or TPU (english full name: thermoplastic Urethanes, chinese name: thermoplastic polyurethane) with high elastic modulus, the outer steering tube 221 is made of TPU with low elastic modulus, and the elastic modulus of the outer guiding tube 211 is greater than the elastic modulus of the outer steering tube 221; the end face of the guide outer tube 211 near the end of the outer tube 221 is fixedly connected with the end face of the outer tube 221 near the end of the guide outer tube 211.

When a thrombus in an intracranial vessel of a patient needs to be sucked, an operator inserts a distal end portion 200 of a suction catheter into the intracranial vessel of the patient by a pushing force applied to a proximal end portion 100 of the suction catheter, then the operator can control the steering of the distal end portion 200 by manipulating the proximal end portion 100, and with the continuous insertion of the suction catheter, the distal end portion 200 will move to a bifurcation of the intracranial vessel, according to corresponding image data, the operator pushes the distal end portion 200 toward the target vessel to be inserted according to actual requirements, under the guiding action of the guiding outer tube 211, an end surface of the guiding outer tube 211 far from one end of the steering outer tube 221 will be in contact with a wall of the target vessel, then the operator will continue to push the distal end portion 200 toward the vessel to be inserted, and since the elastic modulus of the steering outer tube 221 is smaller than that of the guiding outer tube 211, the pushing force applied to the distal end portion 200 by the steering outer tube 221 will be absorbed by the steering outer tube 221, and at this time, the pushing force applied to the inner wall of the vessel by the guiding outer tube 211 will be weakened, and under the bending steering action of the steering outer tube 221, the pushing force absorbed by the steering outer tube 221 will be converted into a bending force, so that the end surface of the steering outer tube 221 will be smoothly turned toward the end surface of the target vessel to be smoothly extended toward the end of the target vessel to be inserted. By adopting the suction catheter in the application, the distal end 200 of the suction catheter can conveniently and smoothly pass through the bifurcation of the blood vessel, and simultaneously, the damage of the distal end 200 of the suction catheter to the inner wall of the blood vessel is reduced, thereby being beneficial to the recovery of patients.

Referring to fig. 3, 4 and 9, the guide assembly 210 in the present embodiment further includes a guide inner tube 212, the guide outer tube 211 is sleeved on the outer circumferential surface of the guide inner tube 212, the steering assembly 220 further includes a steering inner tube 222, the steering outer tube 221 is sleeved on the outer circumferential surface of the steering inner tube 222, and the steering inner tube 222 is communicated with the guide inner tube 212.

In the embodiment of the application, the guiding inner tube 212 is coaxially arranged with the guiding outer tube 211, the steering inner tube 222 is coaxially arranged with the guiding inner tube 212, the guiding inner tube 212 is made of PTFE (Polytetrafluoroethylene) material, the guiding outer tube 211 is fixedly sleeved on the periphery of the guiding inner tube 212 by adopting a thermoplastic process, the end face of the guiding inner tube 212, which is far away from the steering inner tube 222, is flush with the end face of the guiding outer tube 211, which is far away from the steering outer tube 221, the end face of the guiding inner tube 212, which is near to the steering inner tube 222, is flush with the end face of the guiding outer tube 211, which is near to the steering outer tube 221, and the guiding inner tube 212 not only provides a supporting function for the guiding outer tube 211, but also strengthens the integral strength of the guiding assembly 210; the steering inner pipe 222 is made of PTFE material, the steering inner pipe 222 and the guiding inner pipe 212 are made of the same pipe, the steering outer pipe 221 is fixedly sleeved on the periphery of the steering inner pipe 222, the end face, close to one end of the guiding inner pipe 212, of the steering inner pipe 222 is flush with the end face, close to one end of the guiding outer pipe 211, of the steering outer pipe 221, the end face, close to one end of the proximal end 100, of the steering inner pipe 222 is flush with the end face, close to one end of the proximal end 100, of the steering outer pipe 221, and the steering inner pipe 222 not only provides a supporting function for the steering outer pipe 221, but also strengthens the integral strength of the steering assembly 220.

As an alternative in this embodiment, the guide outer tube 211 may be made of a material such as W, baSO, for example, by adding metal powder or a corresponding metal compound to the guide outer tube 211 during the process of manufacturing the guide outer tube 211, so as to strengthen the elastic modulus of the guide outer tube 211.

Referring to fig. 3 and 4, as an alternative to the embodiment of the present application, the guide assembly 210 further includes an expansion ring 213, the expansion ring 213 being coaxial with the guide inner tube 212 and embedded in the guide inner tube 212, the expansion ring 213 having an outer diameter larger than an inner diameter of the guide inner tube 212 such that an expansion plane 2111 is formed on an outer circumferential surface of the guide outer tube 211.

In this alternative, the expanding ring 213 is a developing ring, and the developing ring is fixedly embedded in the inner guide tube 212, and the developing ring may be located in the inner guide tube 212 entirely or in part in the inner guide tube 212; the outer diameter of the expansion plane 2111 is larger than that of the outer guide tube 211 by the expansion ring 213, so that the moment of inertia of the guide assembly 210 is enhanced, the bending strength of the guide assembly 210 is enhanced, the guide assembly 210 is prevented from bending and deforming under the condition of being pressed, and the guide function of the guide assembly 210 is ensured.

Referring to fig. 3 and 4, as an alternative in the embodiment of the present application, the end surface of the expansion ring 213, which is far from the steering inner tube 222, is located on the side of the guide inner tube 212, which is far from the steering inner tube 222, such that a guide slope 2112, which is located on the side of the expansion plane 2111, which is far from the steering assembly 220, is formed on the outer circumferential surface of the guide outer tube 211, and the guide slope 2112 is gradually inclined toward the direction approaching the guide inner tube 212 from the end near the expansion plane 2111 to the end far from the expansion plane 2111.

In this alternative, the expansion ring 213 is located at an intermediate position of the guide inner tube 212, although in other embodiments, the expansion ring 213 may be located at other positions inside the guide inner tube 212; the guide ramp 2112 is further provided to facilitate smooth insertion of the guide assembly 210 into the target vessel, further reducing damage to the vessel interior wall caused by the guide outer tube 211.

Referring to fig. 3 and 4, as an alternative to the embodiment of the present application, the outer edge of the guide outer tube 211, which is remote from the end face of the outer tube 221, is formed as a rounded edge. The outer edge thus designed further reduces the damage to the vessel inner wall caused by the guide outer tube 211.

Referring to fig. 3 and 4, as an alternative to the embodiment of the present application, the inner wall surface of the guide inner tube 212 is formed as a flaring slope 2121 on the side of the expansion ring 213 away from the steering inner tube 222, the flaring slope 2121 being gradually sloped toward the guide outer tube 211 from the end near the expansion ring 213 to the end far from the expansion ring 213.

In this alternative, the angle between the flared surface 2121 and the inner wall surface of the guide inner tube 212 is in the range of 1 ° -3 °, and the suction efficiency of the suction catheter is improved by increasing the inner diameter of the guide inner tube 212 away from the port of the steering inner tube 222 to enhance the suction capacity of the suction catheter and to smoothly suck a larger volume of thrombus into the suction catheter.

Referring to fig. 3, 4 and 5, as an alternative way in the embodiment of the present application, the steering assembly 220 further includes a reinforcing elastic ring 223, the reinforcing elastic ring 223 is sleeved on the outer circumferential surface of the steering inner tube 222, and the steering outer tube 221 is sleeved on the outer circumferential surface of the reinforcing elastic ring 223.

In this alternative manner, the reinforced elastic ring 223 is coaxially arranged with the steering inner tube 222, the reinforced elastic ring 223 is a double-layer spring ring, the double-layer spring ring is fixedly sleeved on the outer circumferential surface of the steering inner tube 222, the steering outer tube 221 is fixedly sleeved on the outer circumferential surface of the double-layer spring ring by adopting a thermoplastic process, the end surface of the double-layer spring ring, which is close to one end of the guide assembly 210, is flush with the end surface of the steering inner tube 222, which is close to one end of the guide assembly 210, and the end surface of the double-layer spring ring, which is close to one end of the proximal end 100, is flush with the end surface of the steering inner tube 222, which is close to one end of the proximal end 100; the reinforced elastic ring 223 reinforces the overall strength of the steering assembly 220, prevents the steering assembly 220 from collapsing in the steering inner tube 222 during bending, and ensures the normal development of the pumping operation. Of course, in other embodiments, the reinforcing elastomeric ring 223 may be a belleville spring, a coil spring, or other higher strength spring ring.

Referring to fig. 1 to 3, 4, 6 and 7, the proximal portion 100 in the present embodiment includes a proximal inner tube 120 and a proximal outer tube 110, the proximal outer tube 110 is sleeved on the outer peripheral surface of the proximal inner tube 120, the proximal outer tube 110 is in communication with a steering outer tube 221, the proximal outer tube 110 is formed as a proximal passage, and the proximal inner tube 120 is in communication with a steering inner tube 222.

In the embodiment of the present application, the proximal inner tube 120 and the steering inner tube 222 are coaxially disposed, the proximal outer tube 110 and the proximal inner tube 120 are coaxially disposed, the proximal outer tube 110 may be made of Pebax or TPU, the proximal inner tube 120 is made of PTFE, the proximal inner tube 120 and the steering inner tube 222 are the same tube, the proximal outer tube 110 is fixedly sleeved on the outer peripheral surface of the proximal inner tube 120, the outer diameter of the proximal outer tube 110 is equal to the outer diameter of the steering outer tube 221, the end surface of the proximal outer tube 110 near the end of the steering outer tube 221 is flush with the end surface of the proximal inner tube 120 near the end of the steering inner tube 222, and the end surface of the proximal outer tube 110 far from the end of the steering outer tube 221 is flush with the end surface of the proximal inner tube 120 far from the end of the steering inner tube 222. After the end surface of the guiding outer tube 211 far from the end of the turning outer tube 221 is moved to a required suction position in the blood vessel, the external suction device is communicated with the end of the proximal inner tube 120 far from the end of the turning inner tube 222, and under the suction action of the external suction device, the thrombus in the blood vessel is sucked out through the guiding inner tube 212, the turning inner tube 222 and the proximal inner tube 120 in sequence. The proximal portion 100 is provided not only to lengthen the length of the entire aspiration catheter, but also to provide support for the distal portion 200.

Referring to fig. 3, 4, 6 and 7, as an alternative to the embodiment of the present application, the proximal portion 100 further includes a proximal reinforcing ring 130, the proximal reinforcing ring 130 is sleeved on the outer peripheral surface of the proximal inner tube 120, and the proximal outer tube 110 is sleeved on the outer peripheral surface of the proximal reinforcing ring 130. Specifically, the proximal reinforcing ring 130 is coaxially disposed with the proximal inner tube 120, and the proximal reinforcing ring 130 is a common spring ring, so as to enhance the strength of the entire proximal portion 100, avoid collapsing of the proximal inner tube 120 during the pushing force applied to the proximal portion 100 by the operator, and in other embodiments, the proximal reinforcing ring 130 may be a spring ring with higher strength; in addition, the end face of the proximal reinforcing ring 130 near the outer tube 221 is flush with the end face of the proximal outer tube 110 near the outer tube 221, and the end face of the proximal reinforcing ring 130 near the outer tube 221 is flush with the end face of the proximal outer tube 110 near the outer tube 221.

Referring to fig. 3, 4, 7, 9 and 10, as an alternative manner in the embodiment of the present application, the guide assembly 210 further includes a balloon 214 and an air tube 215, the balloon 214 is sleeved on the outer circumferential surface of the guide inner tube 212, the guide outer tube 211 is sleeved on the outer circumferential surface of the balloon 214, a first end of the air tube 215 is communicated with the balloon 214, and a second end of the air tube 215 sequentially extends to the outside of the suction catheter through a gap between the steering inner tube 222 and the steering outer tube 221 and a gap between the proximal inner tube 120 and the proximal inner tube 120.

In this alternative, the balloon 214 is coaxially disposed with the inner guide tube 212, the outer surface of the balloon 214 is fixedly connected with the outer circumferential surface of the inner guide tube 212, and the outer surface of the balloon 214 is fixedly connected with the inner wall surface of the outer guide tube 211, so that the balloon 214 can not only stably bring the inner guide tube 212 together to expand or contract, but also can be stably restrained between the inner guide tube 212 and the outer guide tube 211; when thrombus is sucked into the steering inner tube 222 or the proximal inner tube 120 under the suction action of the suction device, the balloon 214 is pressurized through the air tube 215, and at this time, the balloon 214 is inflated and pushes the two opposite inner walls of the guiding inner tube 212 to move in the direction of approaching each other, so that the thrombus in the steering inner tube 222 or the proximal inner tube 120 can be blocked from flowing back into the blood vessel of the patient; when thrombus is sucked out of the suction catheter and thrombus in the blood vessel of the patient needs to be sucked again, the air in the balloon 214 is released through the air tube 215, the balloon 214 is contracted at the moment, the guiding inner tube 212 is restored to the original state by utilizing the self elastic force, and then the thrombus in the blood vessel of the patient can be sucked into the guiding inner tube 212 again by utilizing the suction device and sequentially sucked out of the suction catheter through the steering inner tube 222 and the proximal inner tube 120; the reinforced elastic ring 223 is arranged in the gap between the steering inner tube 222 and the steering outer tube 221, the air tube 215 can pass through the gap between the reinforced elastic ring 223, the near-end reinforced ring 130 is arranged between the near-end inner tube 120 and the near-end outer tube 110, the air tube 215 can pass through the gap between the near-end reinforced ring 130, and the air tube 215 is arranged in the gap between the steering inner tube 222 and the steering outer tube 221 and the gap between the near-end inner tube 120 and the near-end outer tube 110.

Referring to fig. 7, as an alternative to the embodiment of the present application, there are at least two air tubes 215, each air tube 215 is disposed at intervals around the circumference of the guide inner tube 212, a first end of each air tube 215 is communicated with the balloon 214, and a second end of each air tube 215 extends outside the suction catheter sequentially through a gap between the steering inner tube 222 and the steering outer tube 221 and a gap between the proximal inner tube 120 and the proximal inner tube 120.

In this alternative, two air tubes 215 are provided, and two air tubes 215 are disposed opposite each other centering on the axis of the guide inner tube 212, although in other embodiments, three, four, or more air tubes 215 may be provided. The plurality of air tubes 215 are provided to increase the inflation speed of the balloon 214 and the deflation speed of the balloon 214.

Referring to fig. 1, 3 and 4, the suction catheter in this embodiment further includes a stabilizing assembly 230, the stabilizing assembly 230 is disposed on a side of the steering assembly 220 away from the guide assembly 210, the stabilizing assembly 230 includes a stabilizing outer tube 231, a first end of the stabilizing outer tube 231 is communicated with the steering outer tube 221, a second end of the stabilizing outer tube 231 is communicated with the proximal passage, an elastic modulus of the stabilizing outer tube 231 is greater than an elastic modulus of the steering outer tube 221, and a maximum outer diameter of the stabilizing outer tube 231 is greater than or equal to an outer diameter of the steering outer tube 221.

In the embodiment of the present application, the stabilizing outer tube 231 is coaxially arranged with the steering inner tube 222, the stabilizing outer tube 231 may be made of Pebax with high elastic modulus or TPU with high elastic modulus, and the elastic modulus of the stabilizing outer tube 231 is greater than that of the steering outer tube 221; the end face of the stabilizing outer tube 231, which is close to the end of the steering outer tube 221, is fixedly connected with the end face of the steering outer tube 221, which is far away from the end of the guiding outer tube 211, and the end face of the stabilizing outer tube 231, which is close to the end of the proximal outer tube 110, is fixedly connected with the end face of the proximal outer tube 110, which is close to the end of the stabilizing outer tube 231.

After the end surface of the guide outer tube 211, which is far from the end of the outer tube 221, is brought into contact with the wall of the target vessel, the operator continues to push the distal end portion 200 into the intracranial vessel, and since the elastic modulus of the outer tube 221 is smaller than that of the guide outer tube 211, the pushing force of the proximal end portion 100 applied to the distal end portion 200 is absorbed by the outer tube 221, and at this time, the pushing force of the outer tube 211 applied to the inner wall of the vessel is weakened, and at the same time, the pushing force absorbed by the outer tube 221 is converted into a bending force by the bending and steering action of the outer tube 221 and the stabilizing pushing action of the stabilizing outer tube 231, so that the end surface of the outer tube 211, which is far from the outer tube 221, can be turned and extended into the target vessel, and with the continuous insertion of the aspiration catheter, the outer tube 211 and the outer tube 221 are sequentially and smoothly inserted into the target vessel. The provided stabilizing assembly 230 not only plays a role in pushing and supporting, but also ensures that the steering assembly 220 has enough arch when being bent, thereby ensuring that the guiding outer tube 211 can smoothly pass through the vascular bifurcation and be inserted into a target blood vessel, improving the passing rate and passing speed, simultaneously blocking blood and thrombus at one side of the stabilizing assembly 230 far away from the steering assembly 220 from flowing to the end position of the guiding outer tube 211 far away from one end of the steering outer tube 221, reducing the flow velocity of the blood and thrombus at the end position of the guiding outer tube 211 far away from one end of the steering outer tube 221, and greatly improving the suction efficiency and suction speed.

Referring to fig. 3 and 4, as an alternative to the embodiment of the present application, the stabilizing assembly 230 further includes a stabilizing inner tube 232, and a stabilizing outer tube 231 is sleeved on the outer circumferential surface of the stabilizing inner tube 232, and the stabilizing inner tube 232 is communicated with the steering inner tube 222 and is communicated with the proximal inner tube 120.

In this alternative, the stabilizing inner tube 232 and the stabilizing outer tube 231 are coaxially arranged, the stabilizing inner tube 232 is made of PTFE, the stabilizing inner tube 232 and the steering inner tube 222 are made of the same tube, the stabilizing outer tube 231 is fixedly sleeved on the outer circumferential surface of the stabilizing inner tube 232, the end face, close to one end of the steering inner tube 222, of the stabilizing inner tube 232 is flush with the end face, close to one end of the steering outer tube 221, of the stabilizing outer tube 231, and the end face, close to one end of the proximal inner tube 120, of the stabilizing inner tube 232 is flush with the end face, close to one end of the proximal outer tube 110, of the stabilizing outer tube 231. The provision of the stabilizing inner tube 232 not only provides support for the stabilizing outer tube 231, but also enhances the overall strength of the stabilizing assembly 230.

Referring to fig. 3 and 4, as an alternative to the embodiment of the present application, the stabilizing assembly 230 further includes an expanding ring 233, wherein the expanding ring 233 is coaxial with the stabilizing inner tube 232 and embedded in the stabilizing inner tube 232, and an outer diameter of the expanding ring 233 is equal to or larger than an inner diameter of the stabilizing inner tube 232.

In this alternative, the spreader ring 233 is a developing ring, which is fixedly embedded in the stabilizing inner tube 232; the provided stay ring 233 forms a stay plane having an outer diameter equal to or larger than the outer diameter of the outer stabilizing tube 231 on the outer circumferential surface of the outer stabilizing tube 231, thereby enhancing the moment of inertia of the entire stabilizing assembly 230 and further enhancing the bending strength of the entire stabilizing assembly 230. In addition, in the case where the end face of the spreader ring 233 near the end of the steering inner tube 222 is located on the side of the stabilizing inner tube 232 near the proximal inner tube 120 near the end of the steering inner tube 222, a slope on the side of the spreader plane away from the proximal end 100 is formed on the outer peripheral surface of the stabilizing outer tube 231, the slope being gradually inclined in the direction approaching the stabilizing inner tube 232 from the end near the spreader plane to the end far from the spreader plane. Specifically, the strut ring 233 may be located at the middle position of the stabilizing inner tube 232, and the formed inclined plane plays a guiding role, so that the stabilizing assembly 230 can move smoothly in the blood vessel, and the damage of the stabilizing outer tube 231 to the inner wall of the blood vessel is reduced. Of course, when the inner diameter of the blood vessel is smaller or the size of the super-selected blood vessel corner is smaller, and the condition is mild, the support ring 233 may not be provided in the stabilizing inner tube 232, and at this time, the outer diameter of the stabilizing outer tube 231 remains unchanged along the axial direction of the stabilizing outer tube 231 and is the same as the outer diameter of the steering outer tube 221.

Referring to fig. 3, 4 and 8, as an alternative to the embodiment of the present application, the stabilizing assembly 230 further includes a stabilizing reinforcement ring 234, the stabilizing reinforcement ring 234 is sleeved on the outer peripheral surface of the stabilizing inner tube 232, and the stabilizing outer tube 231 is sleeved on the outer peripheral surface of the stabilizing reinforcement ring 234.

In this alternative, the stabilizing reinforcement ring 234 is coaxially disposed with the stabilizing inner tube 232 and may be the same component as the proximal reinforcement ring 130, where the stabilizing reinforcement ring 234 is a common spring ring to enhance the overall strength of the stabilizing assembly 230, to avoid collapse of the stabilizing inner tube 232 during the pushing force applied to the distal end 200 by the operator, although in other embodiments, the stabilizing reinforcement ring 234 may be a spring ring with a higher strength; in addition, the end face of the stabilizing reinforcement ring 234 near the end of the outer tube 221 is flush with the end face of the stabilizing outer tube 231 near the end of the outer tube 221, and the end face of the stabilizing reinforcement ring 234 far from the end of the outer tube 221 is flush with the end face of the stabilizing outer tube 231 far from the end of the outer tube 221.

In summary, implementing the suction catheter provided by this embodiment has at least the following beneficial technical effects: when a thrombus in an intracranial vessel of a patient needs to be sucked, an operator inserts a distal end portion 200 of a suction catheter into the intracranial vessel of the patient by a pushing force applied to a proximal end portion 100 of the suction catheter, then the operator can control the steering of the distal end portion 200 by manipulating the proximal end portion 100, and with the continuous insertion of the suction catheter, the distal end portion 200 will move to a bifurcation of the intracranial vessel, according to corresponding image data, the operator pushes the distal end portion 200 toward the target vessel to be inserted according to actual requirements, under the guiding action of the guiding outer tube 211, an end surface of the guiding outer tube 211 far from one end of the steering outer tube 221 will be in contact with a wall of the target vessel, then the operator will continue to push the distal end portion 200 toward the vessel to be inserted, and since the elastic modulus of the steering outer tube 221 is smaller than that of the guiding outer tube 211, the pushing force applied to the distal end portion 200 by the steering outer tube 221 will be absorbed by the steering outer tube 221, and at this time, the pushing force applied to the inner wall of the vessel by the guiding outer tube 211 will be weakened, and under the bending steering action of the steering outer tube 221, the pushing force absorbed by the steering outer tube 221 will be converted into a bending force, so that the end surface of the steering outer tube 221 will be smoothly turned toward the end surface of the target vessel to be smoothly extended toward the end of the target vessel to be inserted. By adopting the suction catheter in the application, the distal end 200 of the suction catheter can conveniently and smoothly pass through the bifurcation of the blood vessel, and simultaneously, the damage of the distal end 200 of the suction catheter to the inner wall of the blood vessel is reduced, thereby being beneficial to the recovery of patients.

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.

Claims (10)

1. A suction catheter, characterized in that the suction catheter comprises a proximal portion (100) and a distal portion (200) arranged at one side of the proximal portion (100), the distal portion (200) comprises a guide assembly (210) and a steering assembly (220), the steering assembly (220) is arranged between the guide assembly (210) and the proximal portion (100), the guide assembly (210) comprises a guide outer tube (211), the steering assembly (220) comprises a steering outer tube (221), the guide outer tube (211) is communicated with the steering outer tube (221), the elastic modulus of the guide outer tube (211) is larger than that of the steering outer tube (221), and the proximal portion (100) is provided with a proximal passage which is communicated with the steering outer tube (221).

2. The aspiration catheter according to claim 1, wherein the guide assembly (210) further comprises a guide inner tube (212), the guide outer tube (211) is sleeved on the outer circumferential surface of the guide inner tube (212), the steering assembly (220) further comprises a steering inner tube (222), the steering outer tube (221) is sleeved on the outer circumferential surface of the steering inner tube (222), and the steering inner tube (222) is communicated with the guide inner tube (212).

3. The aspiration catheter according to claim 2, wherein the guide assembly (210) further comprises an expansion ring (213), the expansion ring (213) being coaxial with the guide inner tube (212) and embedded within the guide inner tube (212), the expansion ring (213) having an outer diameter larger than an inner diameter of the guide inner tube (212) such that an expansion plane (2111) is formed on an outer circumferential surface of the guide outer tube (211).

4. A suction catheter according to claim 3, wherein an end face of the expansion ring (213) away from the turning inner tube (222) is located on a side of the guide inner tube (212) away from the turning inner tube (222), such that a guide inclined surface (2112) on a side of the expansion plane (2111) away from the turning assembly (220) is formed on an outer peripheral surface of the guide outer tube (211), the guide inclined surface (2112) being inclined gradually from an end near the expansion plane (2111) to an end far from the expansion plane (2111) toward a direction near the guide inner tube (212).

5. The aspiration catheter according to claim 4, wherein an inner wall surface of the guide inner tube (212) is formed as a flaring bevel (2121) on a side of the expansion ring (213) away from the steering inner tube (222), the flaring bevel (2121) being gradually inclined toward a direction approaching the guide outer tube (211) from an end approaching the expansion ring (213) to an end away from the expansion ring (213).

6. The aspiration catheter according to any one of claims 2 to 5, wherein the steering assembly (220) further comprises a reinforcing elastic ring (223), the reinforcing elastic ring (223) is sleeved on the outer circumferential surface of the steering inner tube (222), and the steering outer tube (221) is sleeved on the outer circumferential surface of the reinforcing elastic ring (223).

7. The aspiration catheter according to claim 6, wherein the proximal portion (100) comprises a proximal inner tube (120) and a proximal outer tube (110), the proximal outer tube (110) being sleeved on the outer circumferential surface of the proximal inner tube (120), the proximal outer tube (110) being in communication with the steering outer tube (221), the proximal outer tube (110) being formed as the proximal channel, the proximal inner tube (120) being in communication with the steering inner tube (222).

8. The aspiration catheter according to claim 7, wherein the guide assembly (210) further comprises a balloon (214) and an air tube (215), the balloon (214) is sleeved on the outer circumferential surface of the guide inner tube (212), the guide outer tube (211) is sleeved on the outer circumferential surface of the balloon (214), a first end of the air tube (215) is communicated with the balloon (214), and a second end of the air tube (215) sequentially extends out of the aspiration catheter through a gap between the steering inner tube (222) and the steering outer tube (221) and a gap between the proximal inner tube (120) and the proximal inner tube (120).

9. The aspiration catheter according to claim 7, further comprising a stabilizing assembly (230), the stabilizing assembly (230) being provided on a side of the steering assembly (220) remote from the guiding assembly (210), the stabilizing assembly (230) comprising a stabilizing outer tube (231), a first end of the stabilizing outer tube (231) being in communication with the steering outer tube (221), a second end of the stabilizing outer tube (231) being in communication with the proximal channel, the elastic modulus of the stabilizing outer tube (231) being greater than the elastic modulus of the steering outer tube (221), the largest outer diameter of the stabilizing outer tube (231) being greater than or equal to the outer diameter of the steering outer tube (221).

10. The aspiration catheter according to claim 9, wherein the stabilization assembly (230) further comprises a stabilization inner tube (232), the stabilization inner tube (232) being in communication with the steering inner tube (222) and with the proximal inner tube (120), the stabilization outer tube (231) being sleeved on an outer circumferential surface of the stabilization inner tube (232);

the stabilizing assembly (230) further comprises an expanding ring (233), the expanding ring (233) is coaxial with the stabilizing inner tube (232) and embedded in the stabilizing inner tube (232), and the outer diameter of the expanding ring (233) is larger than or equal to the inner diameter of the stabilizing inner tube (232); or alternatively, the first and second heat exchangers may be,

the stabilizing assembly (230) further comprises a stabilizing reinforcing ring (234), the stabilizing reinforcing ring (234) is sleeved on the outer peripheral surface of the stabilizing inner tube (232), and the stabilizing outer tube (231) is sleeved on the outer peripheral surface of the stabilizing reinforcing ring (234).