Intracranial balloon aspiration catheter

Abstract

The invention provides an intracranial balloon suction catheter, wherein an outer tube is sleeved on the outside of an inner tube, and the distal end of the inner tube extends out of the distal end of the outer tube; the proximal end of the balloon is connected to the distal end of the outer tube, and the distal end of the balloon is connected to the distal end of the inner tube, and a reinforcement layer is located between the inner tube and the outer tube, and its length is adapted to the length of the outer tube; catheter seats are correspondingly connected to the proximal ends of the inner tube and the outer tube, and the catheter seat is provided with at least a suction port corresponding to the inner cavity of the inner tube and a liquid supply port corresponding to the reinforcement layer; in response to supplying a filling medium into the liquid supply port, the filling medium passes through a filling channel to fill the balloon and then supports it on the inner wall of the blood vessel, and the balloon is located at the portion of the distal end of the inner tube extending out of the outer tube, thereby reducing the size of the distal end of the suction catheter, facilitating the suction catheter to extend into the blood vessel, and enabling the suction catheter to enter the further distal end of the blood vessel, and when the balloon is filled, the distal end of the suction catheter is supported by the balloon so that the diameter of the blood vessel can be increased, thereby increasing the suction force of the suction catheter.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to an intracranial balloon aspiration catheter. Background Art

[0002] The balloon aspiration catheter is a special intravascular treatment device that combines the occlusion function of a balloon with the aspiration function of an aspiration catheter. During the procedure, the balloon is placed at the distal end of the aspiration catheter and the blood flow is blocked by inflating the balloon, thereby creating a relatively closed environment and improving the aspiration efficiency.

[0003] In existing balloon aspiration catheters, the balloon is located at the distal end of the aspiration catheter to block blood flow. This design method increases the size of the distal end of the aspiration catheter, affecting the balloon aspiration catheter's entry into the target blood vessel, making it impossible to effectively aspirate thrombi, thereby affecting the surgical effect.

[0004] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, and the present invention provides an intracranial balloon aspiration catheter.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] An intracranial balloon aspiration catheter, characterized by comprising:

[0008] An inner tube, the inner tube is made of elastic material, an outer tube is sleeved on the outer portion of the inner tube, and a distal end of the inner tube extends out of a distal end of the outer tube;

[0009] A reinforcing layer, the reinforcing layer is located between the inner tube and the outer tube, the length of the reinforcing layer matches the length of the outer tube, and a filling channel is provided in the reinforcing layer;

[0010] A balloon, wherein the proximal end of the balloon is correspondingly connected to the filling channel, and the distal end of the balloon is connected to the distal end of the inner tube;

[0011] The inner tube and the outer tube are connected to the proximal ends thereof with catheter seats, and the catheter seats have at least a suction port corresponding to the inner cavity of the inner tube and a liquid supply port corresponding to the reinforcement layer;

[0012] In response to the filling medium being supplied to the liquid supply port, the filling medium passes through the filling channel to inflate the balloon and then supports it on the inner wall of the blood vessel.

[0013] Preferably, the reinforcement layer comprises a first layer and a second layer which are sleeved with each other, and a filling channel corresponding to the liquid supply port and the inner cavity of the balloon is provided between the first layer and the second layer.

[0014] Preferably, the filling channel is a flexible pipe, and no less than two flexible pipes are evenly distributed about the circumference of the reinforcement layer.

[0015] Preferably, at least two flexible strips are supported between the first layer and the second layer, and the length of the flexible strips is adapted to the length of the reinforcing layer so as to form a filling channel between two adjacent flexible strips.

[0016] Preferably, a plurality of the flexible strips are correspondingly distributed on the elastic membrane sleeve.

[0017] Preferably, the diameter of the distal end of the suction catheter is smaller than the diameter of the proximal end.

[0018] Preferably, the distal end of the catheter seat corresponds to the proximal end of the outer tube, the proximal end of the catheter seat is a suction port, the liquid supply port is arranged in the middle of the catheter seat, and the inner tube extends along the inner cavity of the catheter seat to the proximal side of the liquid supply port and is sealed and connected to the inner wall of the catheter seat.

[0019] Preferably, the inner tube is slidably and sealingly connected to the catheter seat, so that the axial length of the balloon can be adjusted by the length of the inner tube extending beyond the distal end of the outer tube.

[0020] Preferably, quick connectors are correspondingly provided at the proximal ends of the liquid supply port and the suction port.

[0021] Preferably, the distal ends of the outer tube and the inner tube are both provided with developing rings.

[0022] Beneficial effects: The balloon is located at the part of the inner tube that extends out of the outer tube at the distal end, which reduces the size of the distal end of the suction catheter, facilitates the suction catheter to enter the blood vessel, and allows the suction catheter to enter the farther end of the blood vessel. When the balloon is inflated, the distal end of the suction catheter is supported by the balloon so that the caliber of the blood vessel can be increased, thereby increasing the suction force of the suction catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0024] Figure 1 A simplified structural diagram of a suction catheter in a specific embodiment provided by the present invention;

[0025] Figure 2 A simplified structural diagram of a suction catheter in a balloon-filled state according to a specific embodiment of the present invention;

[0026] Figure 3 for Figure 1 The enlarged schematic diagram at A in the middle;

[0027] Figure 4 for Figure 1 The enlarged schematic diagram of point B in the middle;

[0028] Figure 5 A schematic diagram of the distribution of the filling tubes in a specific embodiment provided by the present invention;

[0029] Figure 6 A schematic diagram of the distribution of the flexible strips in a specific embodiment provided by the present invention;

[0030] Figure 7 A schematic diagram of the distribution of the arc-shaped plates in a specific embodiment provided by the present invention;

[0031] Figure 8 A simplified structural diagram of a balloon elongated along the axial direction in a specific embodiment provided by the present invention;

[0032] Fig. 9 for Figure 8 Enlarged schematic diagram at point C in the middle.

[0033] In the figure: 1, catheter seat; 2, liquid supply port; 3, suction port; 4, outer tube; 5, reinforcement layer; 6, inner tube; 7, balloon; 8, developing ring; 9, sealing ring;

[0034] 501, first layer; 502, second layer; 503, filling tube; 504, flexible strip; 505, elastic membrane sleeve; 506, arc plate; 507, elastic rod; 508, elastic wire. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0036] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0038] The “proximal end” referred to in the present disclosure refers to the end closer to the operator, and the “distal end” refers to the end farther from the operator.

[0039] like Figure 1 As shown, the present invention provides an intracranial balloon 7 suction catheter, comprising an inner tube 6, a balloon 7, and a reinforcing layer 5, wherein the inner tube 6 and the outer tube 4 are both made of elastic materials, specifically PU material, the outer tube 4 is sleeved on the outside of the inner tube 6, and the outer surface of the outer tube 4 is provided with a hydrophilic coating.

[0040] In an optional embodiment, the outer tube 4 is formed by seamlessly connecting a plurality of polymer materials of different hardnesses, and along the proximal end to the distal end of the outer tube 4 are polyamide (PA), polyetheramide block copolymer (PEBAX), polyurethane (TPU) and polyolefin elastomer (POE), respectively. Furthermore, the Shore hardness of polyamide and polyetheramide block copolymer varies in the range of 25D to 74D, and the material hardness of the outer tube 4 gradually decreases from the proximal end to the distal end and transitions smoothly; the Shore hardness of the polyurethane (TPU) and polyolefin elastomer (POE) at the distal end of the outer tube 4 is 30A to 62A.

[0041] The inner tube 6 is made of etched polytetrafluoroethylene (e-PTFE) at the proximal end and high-density polyethylene (HDPE) at the distal end. The two inner tube 6 materials are seamlessly connected, the wall thickness of one side is 0.035mm, and the inner diameter of the inner tube 6 is 0.055in. On the one hand, it can adapt to the shape and curvature of the blood vessel and reduce the mechanical stimulation and damage of the catheter to the blood vessel; on the other hand, it plays a supporting role to prevent the balloon 7 from squeezing in the direction of the suction catheter when it is filled.

[0042] The distal end of the inner tube 6 extends out of the distal end of the outer tube 4. A balloon 7 is provided at the portion of the inner tube 6 extending out of the distal end of the outer tube 4. The balloon 7 is a compliant balloon 7 made of polyurethane (TPU). Its shape and size are compact and flat before expansion, similar to an uninflated balloon. The proximal end of the balloon 7 is bonded to the distal end of the filling channel by medical glue, and the distal end of the balloon 7 is bonded to the distal end of the inner tube 6 by medical glue. The rated filling diameter of the balloon 7 after inflation is 10 mm.

[0043] The proximal end of the balloon 7 is connected to the distal end of the outer tube 4, and the distal end of the balloon 7 is connected to the distal end of the inner tube 6, so that the distal outer diameter of the suction catheter can be smaller, thereby improving the smoothness of the suction catheter being inserted into the blood vessel. The reinforcing layer 5 is located between the inner tube 6 and the outer tube 4, and its length is adapted to the length of the outer tube 4. The proximal ends of the inner tube 6 and the outer tube 4 are correspondingly connected with a catheter seat 1, and the catheter seat 1 is bonded and fixed to the inner tube 6 and the outer tube 4 by medical glue. A diffusion stress interface is provided at the distal end of the catheter seat 1, and the diffusion stress interface is fixed to the catheter seat 1 by an "inverted" manner. The outer surface of the distal end of the outer tube 4 is provided with a polyvinyl pyrrolidone (PVP) hydrophilic coating, which is achieved by UV light curing.

[0044] like Figure 2 As shown, the catheter seat 1 has at least a suction port 3 corresponding to the inner cavity of the inner tube 6 and a liquid supply port 2 corresponding to the reinforcement layer 5. The suction port 3 and the liquid supply port 2 are distributed in a Y shape with the catheter seat 1. In response to liquid supply to the liquid supply port 2, liquid is supplied at the liquid supply port 2 through a liquid supply device, and the filling medium is supplied from between the reinforcement layers 5 to the distal end into the balloon 7, so that the balloon 7 is supported on the inner wall of the blood vessel after being filled.

[0045] like Figure 3 As shown, the distal ends of the outer tube 4 and the inner tube 6 are both provided with a developing ring 8. The developing material barium sulfate (BaSO4) content is 40wt%, the outer wall of the inner tube 6 extending out of the distal end of the outer tube 4 is set as a conical surface, and the distal end of the outer tube 4 is provided with a conical head corresponding to the balloon 7, and the balloon 7 is fixed to the end surface of the filling channel or the conical head by medical glue, so as to improve the compliance of the outer tube 4 when inserted into the blood vessel.

[0046] In an optional embodiment, at least one concentrically distributed convex ring is provided on the outer wall of the conical head to improve the stability of the connection with the balloon 7.

[0047] Correspondingly, the distal end of the balloon 7 is fixed to the inner tube 6 by medical glue, and a smooth end surface is provided at the distal end of the inner tube 6 to improve the compliance of the inner tube 6 when it is inserted into the blood vessel.

[0048] like Figure 4 As shown, the reinforcing layer 5 includes a first layer 501 and a second layer 502 which are nested with each other. A filling channel corresponding to the liquid supply port 2 and the inner cavity of the balloon 7 is provided between the first layer 501 and the second layer 502. The filling channel is a filling tube 503 for supplying the filling medium to the balloon 7.

[0049] In another optional embodiment, the first layer 501 and the second layer 502 are both braided layers. Specifically, the proximal ends of the first layer 501 and the second layer 502 use 8 strands of 0.002-inch stainless steel double-strand round wire, which are woven in a variable density in a two-up-two-down weaving manner. The PPI varies from the proximal end to the distal end of the braided segment in the range of 70 to 100, and the braiding density at the proximal end of the braided segment is greater than that at the distal end of the braided segment.

[0050] The distal ends of the first layer 501 and the second layer 502 are coil spring segments, which adopt a 0.002-inch nickel-titanium round wire double coil spring variable pitch design. The braided segment and the coil spring segment can be "butted" or "overlapped".

[0051] In an optional embodiment, a gap is provided between the first layer 501 and the second layer 502, and the filling channel is a flexible tube, the material of which is the same as that of the balloon 7 or the inner tube, to ensure the stability of both during expansion and contraction. No less than two flexible pipes are evenly distributed about the circumference of the reinforcing layer 5. The far end of the filling channel is fixedly connected to the proximal end of the balloon 7 to ensure that the filling medium can be smoothly transported into the balloon 7. When the balloon 7 needs to be expanded, the doctor will inject an appropriate amount of filling medium into the balloon 7 through the filling channel of the balloon 7. As the medium is injected, the balloon 7 will gradually expand and unfold, and its size can be adjusted as needed.

[0052] When the balloon 7 is not filled, the diameter of the distal end of the suction catheter is smaller than the diameter of the proximal end, which reduces the diameter of the distal end of the suction catheter and facilitates the suction catheter to enter the more distal end of the blood vessel. When the balloon 7 is filled, the diameter of the distal end of the suction catheter becomes larger, increasing the suction force of the suction catheter.

[0053] like Figure 5 As shown, the distal end of the catheter seat 1 corresponds to the proximal end of the outer tube 4, the proximal end of the catheter seat 1 is the suction port 3, the liquid supply port 2 is arranged in the middle of the catheter seat 1, and there is an angle between the liquid supply port 2 and the suction port 3, the diffusion stress tube is connected to the distal end of the catheter seat 1, and the diffusion stress tube is used to improve the torque resistance of the outer tube 4 and the inner tube 6 to prevent the outer tube 4 and the inner tube 6 from being broken; the proximal end of the inner tube 6 passes through the diffusion stress tube and is connected to the catheter seat 1, and the inner tube 6 is connected to the guide hole; the outer tube 4 is sleeved on the outside of the inner tube 6, and the proximal end of the outer tube 4 is connected to the diffusion stress tube, and the inner tube 6 extends along the inner cavity of the catheter seat 1 to the proximal side of the liquid supply port 2, and is sealed and connected to the inner wall of the catheter seat 1, thereby forming a supply channel for the filling medium between the inner wall of the catheter seat 1 and the outer wall of the inner tube 6.

[0054] The catheter seat 1 is made of polyethylene terephthalate-1,4-cyclohexanedimethanol (PCTG). The liquid supply port 2 and the suction port 3 are integrally formed, the diffusion stress tube is made of polyolefin (PO), a step corresponding to the outer tube 4 is provided on the inner wall of the distal end of the catheter seat 1, and a step corresponding to the inner tube 6 is provided on the proximal side of the liquid supply port 2 of the catheter seat 1, and the inner tube 6 and the outer tube 4 are fixedly connected to the catheter seat 1 by medical glue.

[0055] like Figure 6As shown, the present application provides an alternative solution for a filling channel. Specifically, there is a gap between the first layer 501 and the second layer 502, and at least two flexible strips 504 are supported between the first layer 501 and the second layer 502. The length of the flexible strip 504 is adapted to the length of the reinforcing layer 5. The material of the flexible strip 504 can be PU material. The support of the flexible strip 504 can avoid the first layer 501 and the second layer 502 from being close to each other, so that a filling channel is formed between two adjacent flexible strips 504.

[0056] In this embodiment, the first layer 501 and the second layer 502 are fixed to the flexible strip 504 by medical adhesive, thereby being elastically fixed to the outside of the inner tube 6 .

[0057] In this embodiment, the number of flexible strips 504 is preferably 4-6, and the plurality of flexible strips 504 are correspondingly distributed on the elastic film sleeve 505. The elastic film sleeve 505 has a certain elastic force, and is thus fixed to the second layer 502 by sleeve connection. The material of the elastic film sleeve 505 can be the same as that of the balloon 7, and the elastic film sleeve 505 and the flexible strips 504 are fixed by medical adhesive.

[0058] In an optional embodiment, the diameter of the distal end of the suction catheter is smaller than the diameter of the proximal end. Specifically, the outer wall of the outer tube 4 can be set to a conical surface with a smaller distal end and a larger proximal end, and the outer diameter of the distal end of the outer tube 4 is 2.70 mm.

[0059] like Figure 7 As shown, the present application provides another alternative solution for the filling channel, specifically, there is a gap between the first layer 501 and the second layer 502, and a support sleeve is provided between the first layer 501 and the second layer 502, the support sleeve includes two groups of arc structures corresponding to the outer wall of the second layer 502, each arc structure includes an elastic rod 507 and a plurality of spaced arc plates 506, the arc plates 506 and the elastic rod 507 are both made of PU material, between the two groups of arc structures, the two arc plates 506 corresponding to the circumference of the suction catheter are fixed by elastic wire 508, the elastic wire 508 can be made of PU material, so that the two arc structures embrace the second layer, and the supporting capacity of the suction catheter is improved by the hollow arc structure, and the hollow gap between the two groups of arc structures can be used as a filling channel.

[0060] The outer diameter of the elastic rod 507 and the elastic wire 508 is not greater than the thickness of the arc plate 506. The arc plate 506, the elastic rod 507 and the elastic wire 508 are integrally formed. The arc angle of the arc plate 506 is 90-120 degrees, the length of the arc plate 506 is 3-10 mm, and the interval between two adjacent arc plates 506 is 5-10 mm, thereby forming a hollow sleeve structure corresponding to the second layer 502.

[0061] The arc plate 506 is fixed to the first layer 501 and the second layer 502 by medical glue.

[0062] In an optional embodiment, quick connectors are correspondingly provided at the proximal ends of the liquid supply port 2 and the suction port 3 .

[0063] like Figure 8 As shown, the intracranial balloon 7 suction catheter includes an inner tube 6, a balloon 7, and a reinforcing layer 5, wherein the inner tube 6 and the outer tube 4 are both made of elastic materials, specifically PU material, the outer tube 4 is sleeved on the outside of the inner tube 6, and the outer surface of the outer tube 4 is provided with a hydrophilic coating.

[0064] The distal end of the inner tube 6 extends out of the distal end of the outer tube 4, and a balloon 7 is provided at the portion of the inner tube 6 extending out of the distal end of the outer tube 4. The balloon 7 is a compliant balloon 7. The proximal end of the balloon 7 is bonded to the filling channel by medical glue, and the distal end of the balloon 7 is bonded to the distal end of the inner tube 6 by medical glue, so that the distal outer diameter of the suction catheter can be made smaller, thereby improving the smoothness of the suction catheter being inserted into the blood vessel. The reinforcement layer 5 is located between the inner tube 6 and the outer tube 4, and its length is adapted to the length of the outer tube 4. A catheter seat 1 is correspondingly connected to the proximal ends of the inner tube 6 and the outer tube 4, and the catheter seat 1 is bonded and fixed to the inner tube 6 and the outer tube 4 by medical glue. The catheter seat 1 has at least a suction port 3 corresponding to the inner cavity of the inner tube 6 and a liquid supply port 2 corresponding to the reinforcement layer 5. The suction port 3 and the liquid supply port 2 are distributed in a Y shape with the catheter seat 1. In response to liquid being supplied to the liquid supply port 2, liquid is supplied at the liquid supply port 2 through a liquid supply device, and the filling medium is supplied to the balloon 7 from the filling channel between the reinforcement layers 5 to the distal end, so that the balloon 7 is supported on the inner wall of the blood vessel after being filled.

[0065] The distal ends of the outer tube 4 and the inner tube 6 are both provided with a developing ring 8 for displaying the specific position of the suction catheter in the blood vessel.

[0066] In this embodiment, the axial length of the balloon 7 can be adjusted. Specifically, the inner tube 6 is slidably and sealingly connected to the catheter seat 1, so that the axial length of the balloon 7 can be adjusted by the length of the inner tube 6 extending from the distal end of the outer tube 4. The effective length of the balloon 7 can be adjusted between 10mm-30mm.

[0067] In this embodiment, the filling channel is preferably formed by a flexible strip 504, and the flexible strip 504, the first layer 501 and the second layer 502 are connected as a whole by glue. The first layer 501 is then fixed to the outer tube 4 by glue, so that the reinforcing layer 5 will not slip with the inner tube 6 when the outer tube 4 is pulled.

[0068] like Fig. 9 As shown, an annular groove is provided on the inner wall of the proximal end of the catheter seat 1, and a sealing ring 9 is provided in the annular groove. The sealing ring 9 and the outer wall of the inner tube 6 are slidably sealed so that the inner tube 6 can be axially pulled and pulled. In this embodiment, a quick interface is correspondingly provided at the proximal end of the inner tube 6 for connecting with a suction device to achieve suction.

[0069] In an optional embodiment, the diameter of the distal end of the suction catheter is smaller than the diameter of the proximal end, the balloon 7 is arranged on the distal end and is integrated with the suction catheter. The part of the suction catheter corresponding to the outer tube 4 is composed of a three-layer structure. The inner tube 6 is made of PU material to reduce the friction between the catheter and the blood and reduce the risk of vascular damage; the reinforcement layer 5 adopts a mesh woven structure to enhance the radial support and negative pressure flattening resistance of the catheter; the outer layer is a polymer layer, and the polymer material has the characteristics of biocompatibility, which ensures the good compatibility of the catheter with human tissue and reduces the risk of infection and rejection.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. An intracranial balloon aspiration catheter, characterized in that: include: An inner tube, the inner tube is made of elastic material, an outer tube is sleeved on the outer portion of the inner tube, and a distal end of the inner tube extends out of a distal end of the outer tube; A reinforcing layer, the reinforcing layer is located between the inner tube and the outer tube, the length of the reinforcing layer matches the length of the outer tube, and a filling channel is provided in the reinforcing layer; A balloon, wherein the proximal end of the balloon is correspondingly connected to the filling channel, and the distal end of the balloon is connected to the distal end of the inner tube; The inner tube and the outer tube are connected to the proximal ends thereof with catheter seats, and the catheter seats have at least a suction port corresponding to the inner cavity of the inner tube and a liquid supply port corresponding to the reinforcement layer; In response to supplying a filling medium into the liquid supply port, the filling medium passes through the filling channel to fill the balloon and then supports it on the inner wall of the blood vessel; The reinforcing layer comprises a first layer and a second layer which are sleeved with each other, and a filling channel which is correspondingly connected to the liquid supply port and the inner cavity of the balloon is provided between the first layer and the second layer; There is a gap between the first layer and the second layer, and a support sleeve is provided between the first layer and the second layer, the support sleeve includes two groups of arc structures corresponding to the outer wall of the second layer, and each arc structure includes an elastic rod and a plurality of arc plates distributed at intervals; Between the two groups of arc structures, two arc plates corresponding to each other in the circumferential direction of the suction catheter are fixed by elastic wires, so that the two arc structures embrace the second layer, and the hollow gap between the two groups of arc structures is used as a filling channel.

2. The intracranial balloon aspiration catheter according to claim 1, characterized in that: The diameter of the distal end of the suction catheter is smaller than the diameter of the proximal section.

3. The intracranial balloon aspiration catheter according to claim 1, characterized in that: The distal end of the catheter seat corresponds to the proximal end of the outer tube, the proximal end of the catheter seat is a suction port, the liquid supply port is arranged in the middle of the catheter seat, the inner tube extends along the inner cavity of the catheter seat to the proximal side of the liquid supply port, and is sealed and connected to the inner wall of the catheter seat.

4. The intracranial balloon aspiration catheter according to claim 3, characterized in that: The inner tube is connected to the catheter seat in a sliding and sealing manner, so that the axial length of the balloon can be adjusted by the length of the inner tube extending out of the distal end of the outer tube.

5. The intracranial balloon aspiration catheter according to claim 1, characterized in that: The proximal ends of the liquid supply port and the suction port are correspondingly provided with quick connectors.

6. The intracranial balloon aspiration catheter according to claim 1, characterized in that: The distal ends of the outer tube and the inner tube are both provided with developing rings.

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