CN215505061U

CN215505061U - Balloon guide catheter

Info

Publication number: CN215505061U
Application number: CN202121642982.6U
Authority: CN
Inventors: 孙权权; 叶萍; 张一�
Original assignee: Shanghai Achieva Medical Suzhou Co ltd
Current assignee: Shanghai Achieva Medical Suzhou Co ltd
Priority date: 2021-07-19
Filing date: 2021-07-19
Publication date: 2022-01-14
Anticipated expiration: 2031-07-19

Abstract

The utility model provides a balloon guide catheter, which comprises a catheter seat, a catheter connected with the catheter seat and a balloon arranged at the far end of the catheter, wherein the catheter comprises an outer tube and an inner tube which are coaxially arranged; the pipe diameter of the outer pipe balloon section is smaller than that of the outer pipe guide section, the outer diameter of the inner pipe balloon section is smaller than that of the inner pipe guide section, and the inner diameter of the inner pipe balloon section is the same as that of the inner pipe guide section; the outer diameter of the product can be reduced on the premise of not reducing the inner cavity of the inner tube, so that the balloon guide catheter can be matched with an 8F blood vessel sheath; and the size of the gap between the inner tube balloon section and the outer tube balloon section is ensured, and the integral conveying performance of the balloon guide catheter is not influenced.

Description

Balloon guide catheter

Technical Field

The utility model relates to the field of medical instruments, in particular to a balloon guiding catheter.

Background

In the intravascular treatment of acute cerebral apoplexy, the temporary blocking of near-end blood flow is realized through the balloon guide catheter, the broken thrombus generated in the stent thrombus taking process can be prevented from being flushed to a far end by the forward blood flow to cause far-end vascular embolism, and meanwhile, the pressure gradient of direct thrombus suction can be obviously improved by using the balloon guide catheter, namely the escape of far-end embolus can be reduced by the balloon guide catheter, the operation time is shortened, and the suction and the withdrawal of an auxiliary thrombus taking instrument are realized, so that the one-time recanalization rate of thrombus taking operation is greatly improved, and the balloon guide catheter is more and more important for successful operation and good healing.

In the existing thrombus removal operation, on one hand, in order to improve the thrombus capture efficiency, the inner cavity of the balloon guide catheter is usually expected to be larger, and the key is to improve the one-time recanalization rate; on the other hand, the higher the position reached by the balloon catheter in the cerebral vessels, the better the occlusion of the proximal blood flow and the suction effect of the thrombus. Therefore, a double combination of a large lumen and a high position is more clinically needed for balloon guide catheters.

However, the larger the inner cavity is, the requirement that a sufficient pressure relief gap is reserved between the inner tube and the outer tube is met, and the pressure relief gap can be realized only by increasing the tube diameter of the outer tube or reducing the wall thicknesses of the inner tube and the outer tube, but the increase of the tube diameter of the outer tube is inevitably required to be matched with a vascular sheath with a larger diameter, if the vascular sheath with the larger diameter is used for puncture, a puncture opening is larger and needs to be sutured, and the pain of a patient is increased; reducing the wall thickness of the inner and outer tubes inevitably affects the delivery performance of the balloon-guided catheter, resulting in less than optimal placement.

In view of the above, there is a need to provide a new balloon guide catheter to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a balloon guiding catheter, which reduces the outer diameter of a product on the premise of not reducing an inner cavity, can be matched with an 8F vascular sheath for use, ensures the space of a cavity and ensures that a balloon can smoothly relieve pressure.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme: a balloon guide catheter comprises a catheter seat, a catheter connected with the catheter seat and a balloon arranged at the far end of the catheter, wherein the catheter comprises an outer tube and an inner tube which are coaxially arranged, a cavity communicated with the balloon is formed between the inner tube and the outer tube, the outer tube comprises an outer tube guide section and an outer tube balloon section connected with the far end of the outer tube guide section, and the inner tube comprises an inner tube guide section and an inner tube balloon section corresponding to the outer tube balloon section; a gap is formed between the near end of the inner tube balloon section and the near end of the outer tube balloon section, the pipe diameter of the outer tube balloon section is smaller than that of the outer tube guiding section, the outer diameter of the inner tube balloon section is smaller than that of the inner tube guiding section, and the inner diameter of the inner tube balloon section is the same as that of the inner tube guiding section.

As a further improved technical scheme of the utility model, the outer diameter of the inner tube balloon section is 95-97% of the outer diameter of the inner tube guide section.

As a further improved technical scheme, the proximal end of the inner tube balloon section is positioned at the proximal end side of the outer tube balloon section along the axial direction of the catheter.

As a further improved technical scheme of the utility model, the balloon is connected with the outer tube balloon section, and the outer tube balloon section and the inner tube balloon section are in closed connection at the far ends.

As a further improved technical scheme, the proximal end of the balloon is connected with the distal end of the outer tube balloon section, and the distal end of the balloon is connected with the distal end of the inner tube balloon section.

As a further improved technical scheme of the utility model, along the circumferential direction of the catheter, part of the outer tube guide section is fixedly connected with the inner tube guide section.

As a further improvement of the present invention, at least a portion of the outer tube at the distal end includes a reinforcing layer.

As a further improved technical scheme of the utility model, the reinforcement layer is a spring coil or a woven mesh.

As a further improved technical scheme of the utility model, along the radial direction of the inner tube, the inner tube comprises an inner lubricating layer, a spring coil layer positioned at the periphery of the inner lubricating layer and an inner tube polymer outer layer positioned at the periphery of the spring coil layer, and a braided net is arranged between the inner tube polymer outer layer corresponding to at least part of the inner tube guide section and the spring coil layer.

As a further improved technical scheme of the utility model, the inner diameter of the inner pipe is 2.18 mm-2.24 mm.

As a further improved technical scheme of the utility model, the diameter of the round wire forming the spring coil layer is 0.0005 inches to 0.002 inches; or the flat wire forming the spring coil layer has a thickness of 0.0005 inches to 0.002 inches and a width of 0.001 inches to 0.004 inches.

As a further improved technical scheme of the utility model, the round wire or the flat wire forming the spring coil layer is made of stainless steel.

As a further improved technical solution of the present invention, the pitch of the spring coil layer corresponding to the inner tube guiding section is 0.0015 to 0.006 inches, and the pitch of the spring coil layer corresponding to the inner tube balloon section is 0.001 to 0.004 inches.

The utility model has the beneficial effects that: the balloon guide catheter has the advantages that the far end of the outer tube is contracted inwards to form the outer tube balloon section, and the outer diameter of the inner tube balloon section at the far end of the inner tube is reduced, so that on one hand, the outer diameter of the balloon adhered to the outer tube balloon section is the same as that of the outer tube guide section, the outer diameter of a product can be reduced on the premise of not reducing the inner cavity of the inner tube, and the balloon guide catheter can be matched with an 8F vascular sheath; on the other hand, the size of the gap between the inner tube balloon section and the outer tube balloon section is ensured, so that the balloon can be smoothly decompressed, and meanwhile, the integral conveying performance of the balloon guide catheter cannot be influenced.

Drawings

Fig. 1 is a cross-sectional view of a catheter in a first embodiment of the utility model.

Fig. 2 is a cross-sectional view of a catheter in a second embodiment of the utility model.

Fig. 3 is a sectional view taken along the line a-a in fig. 2.

Detailed Description

The present invention will be described in detail with reference to the embodiments shown in the drawings, and reference is made to fig. 1 to 3, which are preferred embodiments of the present invention. It should be noted that these embodiments are not intended to limit the present invention, and those skilled in the art should be able to make functional, methodical, or structural equivalents or substitutions according to these embodiments without departing from the scope of the present invention.

The words expressing the position and the direction described in the utility model all take an instrument operator as reference, one end close to the instrument operator is a near end, and the other end far away from the instrument operator is a far end; in addition, unless expressly stated or limited otherwise, the term "coupled" is intended to be inclusive, i.e., that a connection may be direct or indirect via intermediate media, fixed or movable, or detachable or integral. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1-2, the present invention provides a balloon catheter (not numbered) for temporarily blocking proximal blood flow during intravascular treatment of acute stroke.

The balloon guide catheter comprises a catheter seat (not shown), a catheter 1 connected with the catheter seat and a balloon 2 arranged at the far end of the catheter 1, wherein the catheter 1 comprises an outer tube 11 and an inner tube 12 which are coaxially arranged, and a cavity 13 which is communicated with the balloon 2 and has a closed far end is formed between the inner tube 12 and the outer tube 11.

Specifically, the cavity 13 may be a liquid through cavity or a gas through cavity, but is not limited thereto.

The catheter seat is Y-shaped, and the main cavity of the catheter seat is communicated with the inner cavity of the inner tube 12 and can be used for the passing of matched instruments such as a micro catheter, a bracket, a suction catheter, an intermediate catheter, a guide wire and the like. The side lumen of the catheter hub is in communication with the cavity 13 for inflating and retracting the balloon 2.

The structure of the catheter hub, the connection structure between the catheter hub and the catheter 1, etc. can follow the prior art, and are not described herein again.

Specifically, the outer tube 11 includes an outer tube guiding section 111 located at a proximal end, and an outer tube balloon section 112 connected to a distal end of the outer tube guiding section 111, the inner tube 12 includes an inner tube guiding section 121 and an inner tube balloon section 122 corresponding to the outer tube balloon section 112, a tube diameter of the outer tube balloon section 112 is smaller than a tube diameter of the outer tube guiding section 111, an outer diameter of the inner tube balloon section 122 is smaller than an outer diameter of the inner tube guiding section 121, and an inner diameter of the inner tube balloon section 122 is the same as an inner diameter of the inner tube guiding section 121, on one hand, the outer tube balloon section 112 is in a concave state by reducing the tube diameter of the outer tube balloon section 112, an outer diameter of the balloon 2 adhered to the outer tube balloon section 112 is the same as the outer diameter of the outer tube guiding section 111, so that the outer diameter of the catheter 1 can be ensured even if the inner lumen of the inner tube 12 is increased, or the outer diameter of the product can be reduced without reducing the inner lumen of the inner tube, the balloon guide catheter can be matched with an 8F blood vessel sheath, namely the common blood vessel sheath in the market; on the other hand, the outer diameter of the inner balloon section 122 is reduced, so that the size of the gap between the inner balloon section 122 and the outer balloon section 112 is ensured, the balloon 2 can be smoothly decompressed, meanwhile, the wall thickness of the inner balloon section 122 is reduced, but the wall thickness of the outer balloon section 112 is unchanged, the supporting performance of the outer balloon section 112 is sufficient, and the overall conveying performance of the balloon guide catheter is not affected.

It is understood that the tube diameter includes an inner diameter and an outer diameter, and the tube diameter of the outer tube balloon section 112 being smaller than the tube diameter of the outer tube guiding section 111 includes the outer diameter of the outer tube balloon section 112 being smaller than the outer diameter of the outer tube guiding section 111 and the inner diameter of the outer tube balloon section 112 being smaller than the inner diameter of the outer tube guiding section 111. That is, the outer tube balloon section 112 is formed by reducing the distal end of the outer tube 11 by retraction.

Further, the outer diameter of the inner tube balloon section 122 is 95% -97% of the outer diameter of the inner tube guide section 121.

Further, along the axial direction of the catheter 1, a gap is formed between the proximal end of the inner balloon section 122 and the proximal end of the outer balloon section 112, so that liquid injected into the cavity 13 through a syringe can smoothly enter and exit between the outer balloon section 112 and the inner balloon section 122 to inflate and retract the balloon 2.

In one embodiment, the proximal end of the inner balloon section 122 is located at the proximal end side of the outer balloon section 112, and the distance between the proximal end of the inner balloon section 122 and the proximal end of the outer balloon section 112 accounts for 5% -75% of the length of the inner balloon section, so as to ensure that the liquid injected into the cavity 13 by the syringe can smoothly enter and exit between the outer balloon section 112 and the inner balloon section 122 to fill and retract the balloon 2.

Further, the length of the inner tube balloon section 122 is 15 mm-80 mm.

In one embodiment, when the length of the inner tube balloon section 122 is 20mm, the distance between the proximal end of the inner tube balloon section 122 and the proximal end of the outer tube balloon section 112 is 25% of the length of the inner tube balloon section, i.e., the distance between the proximal end of the inner tube balloon section 122 and the proximal end of the outer tube balloon section 112 is 5 mm.

Further, from inside to outside along the radial direction of the inner tube 12, the inner tube 12 includes an inner lubrication layer 123, a spring coil layer 124 located at the outer periphery of the inner lubrication layer 123, an inner tube polymer outer layer 126 located at the outer periphery of the spring coil layer 124, a woven mesh 125 is provided between the inner tube polymer outer layer 126 and the spring coil layer 124 corresponding to at least a part of the inner tube guide section 121, and the spring coil layer 124 and the woven mesh 125 are added into the inner tube 12, so that the bending resistance and flexibility of the inner tube 12 are enhanced, and the delivery performance of the catheter 1 is ensured, so that the balloon guide catheter can reach a position farther from a blood vessel, that is, the requirement of the balloon guide catheter being in a high position is met.

Further, the inner diameter of the inner tube 12 is 2.18mm to 2.24mm, preferably, the inner diameter of the inner tube 12 is 2.21mm, and the balloon guide catheter can be used with the existing commercial 6F intermediate catheter 1Navien and suction catheter 1Sofia with the largest inner cavity of 2.13mm, namely, the balloon guide catheter in the utility model can be matched with all existing 6F intermediate catheters and suction catheters.

In the utility model, the inner tube guiding section 121 adopts a spring coil layer 124 and a structure that at least part of the inner tube guiding section is provided with a woven mesh 125, the woven mesh 125 can improve the hardness of the inner tube 12 so as to improve the conveying performance of the balloon guiding catheter, the spring coil layer can improve the bending resistance of the inner tube 12, so that the balloon guiding catheter can keep a large inner cavity of 2.21mm of the inner tube, the flexibility and the bending resistance of the balloon guiding catheter can be better, a product can reach a farther blood vessel position in an operation, and the requirements of the large inner cavity and the high position of the balloon guiding catheter are met.

Meanwhile, the mesh grid 125 is not arranged on the inner tube balloon section 122, which provides a possibility for the distal diameter-changing process of the inner tube 12, that is, the outer diameter of the inner tube balloon section 122 is smaller than that of the inner tube guiding section 121 as long as the mesh grid is not arranged on the inner tube balloon section 122.

In one embodiment, the spring coil layer 124 is formed from round wire having a diameter of 0.0005 inches to 0.002 inches.

In another embodiment, the spring coil layer 124 is formed from flat wire, such as stainless steel flat wire, having a thickness of 0.0005 inches to 0.002 inches and a width of 0.001 inches to 0.004 inches.

Further, the round wire or the flat wire forming the spring coil layer 124 is made of stainless steel. Of course, this is not a limitation.

Further, the pitch of the spring coil layer 124 corresponding to the inner tube guide section 121 is between 0.0015 inch and 0.006 inch, and the pitch of the spring coil layer 124 corresponding to the inner tube balloon section 122 is between 0.001 inch and 0.004 inch.

In one embodiment, the pitch of the spring coil layer 124 decreases from the proximal end to the distal end, increasing the flexural strength of the inner tube 12. Of course, the pitch of the spring coil layer 124 may be constant from the proximal end to the distal end in other embodiments.

Further, the braided mesh 125 is formed by braiding nickel titanium wires, the PPI of the braided mesh is 50-90 meshes per inch, and the hardness of the inner tube 12 can be enhanced and improved, so that the pushing capacity of the balloon guide catheter is improved.

Further, the knitting density of the knitted mesh 125 gradually increases from the proximal end to the distal end, so that the hardness of the balloon guide catheter segment gradually decreases from the proximal end to the distal end, the pushing performance and the ability of passing through a blood vessel of the balloon guide catheter segment can be improved, and the requirement of high in place can be met.

Further, the distance between the mesh grid 125 and the distal end of the inner tube 12 is 20mm to 80mm, and it is understood that the distance between the mesh grid 125 and the distal end of the inner tube 12 is related to the length of the inner tube balloon segment 122.

Further, the material of the inner tube polymer outer layer 126 is made of thermoplastic polyurethane, block polyether amide elastomer and polyamide. The material of the inner lubricating layer 123 is polytetrafluoroethylene.

Referring to fig. 1, in this embodiment, the balloon 2 is connected to the outer side of the outer tube balloon section 112, and the distal end of the outer tube balloon section 112 and the inner tube balloon section 122 are connected in a closed manner at the distal end.

Specifically, the proximal end and the distal end of the balloon 2 are adhered to the outer periphery of the outer tube balloon section 112 by cured adhesive, and the outer tube balloon section 112 is provided with a through hole, so that the cavity 13 is communicated with the balloon 2.

Further, the length of the outer tube balloon section 112 is 10 mm-30 mm, the length of the balloon 2 is 12 mm-15 mm, and the distance between the balloon 2 and the far end of the catheter 1 is 1.5 mm-3 mm.

Further, the outer tube 11 comprises an outer tube polymer layer with a hydrophilic coating, the hydrophilic coating is located at the far end of the outer tube 11, and the length of the hydrophilic coating is 50 mm-300 mm, so that friction force and pushing force during conveying can be reduced, and the balloon guide catheter is convenient to place.

Specifically, the outer tube polymer skin material is comprised of a thermoplastic polyurethane, a block polyetheramide elastomer, and a polyamide.

The hydrophilic coating can be made of hydrophilic polymer coatings such as polyethylene glycol, polyvinylpyrrolidone and zwitterions.

Further, the distal end of the inner balloon section 122 protrudes outside the distal end of the outer balloon section 112, and the balloon guide catheter further includes a visualization ring 3 disposed at the distal end of the inner balloon section 122, so that the balloon guide catheter can be accurately positioned in the blood vessel.

It is understood that the distal end of the catheter 1 mentioned above refers to the distal end of the inner tube, and the distance from the balloon 2 to the distal end of the catheter 1 is 1.5mm to 3mm, i.e. the distance from the balloon 2 to the distal end of the inner tube 12 is 1.5mm to 3 mm.

The developing ring 3 is made of barium sulfate, bismuth trioxide or bismuth carbonate.

Referring to fig. 2, there is shown a catheter 1' according to a second embodiment of the present invention, which differs from the first embodiment in that: the near end of the sacculus 2 ' is connected with the far end of the outer tube sacculus section 112 ', the far end of the sacculus 2 ' is connected with the far end of the inner tube sacculus section 122, the sacculus 2 ' is closely attached to the inner tube sacculus section 122, namely, the far end of the catheter 1 ' only has the sacculus 2 ' and the inner tube 12, and does not have the outer tube 11 ', and the material of the sacculus 2 ' is silica gel with high compliance, the compliance of the far end of the catheter 1 ' is high, and the far end of the catheter can reach higher positions of blood vessels more easily, so that the requirement of high position is met.

Specifically, the distal end of the outer tube balloon section 112 ' is of an open structure, that is, the distal end of the cavity 13 has an opening, and the cavity 13 is directly communicated with the balloon 2 ', and at this time, a through hole for communicating the cavity 13 with the balloon 2 ' does not need to be designed.

In this embodiment, the length of the outer tube balloon segment 112 ' is 3-8 mm, and the proximal end of the balloon 2 ' is adhered to the outer tube balloon segment 112 '.

Along the circumferential direction of the catheter 1 ', a part of the outer tube guide section 111 ' is fixedly connected with the inner tube guide section 121, so that the inner tube 12 and the outer tube 11 ' do not generate relative displacement, and at the same time, the filling and retracting of the balloon 2 ' are not affected, i.e., except for the fixedly connected part of the outer tube guide section 111 ' and the inner tube guide section 121, the rest of the outer tube guide section 111 ' and the inner tube guide section 121 are not in contact with each other to form at least a part of the cavity 13, so that the balloon 2 ' can be filled and retracted.

Specifically, as shown in fig. 3, in the radial direction of the catheter 1 ', a part of the outer tube guide section 111 ' and a part of the inner tube guide section 121 have fixed connection points, and the rest of the outer tube guide section 111 ' and the inner tube guide section 121 are not in contact with each other to form at least a part of the cavity 13.

Specifically, the distal end of the outer tube guiding section 111 ' has at least two recesses 113 spaced apart along the circumference of the outer tube 11 ', and the fixed connection between the outer tube 11 ' and the inner tube 12 is realized by connecting the recesses 113 and the inner tube 12.

Further, at least a portion of the outer tube 11 at the distal end includes a reinforcing layer, which enhances the rigidity of the structure of the distal end of the outer tube, thereby preventing the outer tube 11 'from being deflated during pressure relief, and at the same time, the outer tube 11' can have better bending resistance and flexibility.

Specifically, the reinforcing layer is disposed on the outer tube balloon section 112 'and the outer tube guiding section 111' partially close to the outer tube balloon section 112 ', so as to further reinforce the strength of the distal end of the outer tube 11'. Of course, this is not a limitation.

Specifically, the reinforcement layer is a spring coil or a woven mesh.

In one embodiment, the reinforcement layer is a spring coil, and the spring coil may be formed of a stainless steel round wire or a flat wire. Specifically, the diameter of the round wire forming the spring coil ranges from 0.0005 inch to 0.002 inch, and the thickness of the flat wire forming the spring coil ranges from 0.0005 inch to 0.002 inch and the width ranges from 0.001 inch to 0.004 inch.

The pitch of the spring coil at the outer tube guide section 111 'ranges from 0.0015 inches to 0.0060 inches, the pitch of the spring coil at the outer tube balloon section 112' ranges from 0.001 inches to 0.004 inches, and the pitch of the spring coil decreases from the proximal end to the distal end in order.

Further, the distance between the balloon 2 'and the far end of the inner tube 12 is 1.5-3 mm, and the developing ring 3 is positioned on the far end side of the balloon 2'.

The second embodiment of the present invention is the same as the first embodiment except for the above differences, and thus, the description thereof is omitted.

In summary, in the balloon guide catheter of the present invention, the distal end of the outer tube 11 is contracted and changed into the outer tube balloon section 112, and the outer diameter of the inner tube balloon section 122 at the distal end of the inner tube 12 is reduced, on one hand, the outer diameter of the balloon 2 adhered to the outer tube balloon section 112 is the same as the outer diameter of the outer tube guide section 111, so that the outer diameter of the product can be reduced without reducing the inner cavity of the inner tube, so that the balloon guide catheter can be matched with an 8F vascular sheath; on the other hand, the size of the gap between the inner tube balloon section 122 and the outer tube balloon section 112 is ensured, so that the balloon 2 can be smoothly decompressed, and meanwhile, the overall conveying performance of the balloon guide catheter cannot be influenced.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. A balloon guide catheter comprises a catheter seat, a catheter connected with the catheter seat and a balloon arranged at the far end of the catheter, wherein the catheter comprises an outer tube and an inner tube which are coaxially arranged, a cavity communicated with the balloon is formed between the inner tube and the outer tube, the outer tube comprises an outer tube guide section and an outer tube balloon section connected with the far end of the outer tube guide section, and the inner tube comprises an inner tube guide section and an inner tube balloon section corresponding to the outer tube balloon section; the method is characterized in that: a gap is formed between the proximal end of the inner tube balloon section and the proximal end of the outer tube balloon section; the pipe diameter of the outer pipe balloon section is smaller than that of the outer pipe guide section, the outer diameter of the inner pipe balloon section is smaller than that of the inner pipe guide section, and the inner diameter of the inner pipe balloon section is the same as that of the inner pipe guide section.

2. The balloon guide catheter of claim 1, wherein: the outer diameter of the inner tube balloon section is 95% -97% of the outer diameter of the inner tube guiding section.

3. The balloon guide catheter of claim 1, wherein: the proximal end of the inner tube balloon section is located on the proximal side of the outer tube balloon section in the axial direction of the catheter.

4. The balloon guide catheter of claim 1, wherein: the balloon is connected with the outer tube balloon section, and the outer tube balloon section and the inner tube balloon section are connected in a closed mode at the far end.

5. The balloon guide catheter of claim 1, wherein: the proximal end of the balloon is connected to the distal end of the outer tube balloon section and the distal end of the balloon is connected to the distal end of the inner tube balloon section.

6. The balloon guide catheter of claim 5, wherein: and along the circumferential direction of the catheter, part of the outer pipe guide section is fixedly connected with the inner pipe guide section.

7. The balloon guide catheter of claim 5, wherein: at least a portion of the outer tube at the distal end includes a reinforcement layer.

8. The balloon guide catheter of claim 7, wherein: the enhancement layer is a spring coil or a woven mesh.

9. The balloon guide catheter of claim 1, wherein: along the radial direction of the inner pipe, the inner pipe comprises an inner lubricating layer, a spring coil layer positioned on the periphery of the inner lubricating layer, an inner pipe polymer outer layer positioned on the periphery of the spring coil layer, and a braided net is arranged between the inner pipe polymer outer layer corresponding to at least part of the inner pipe guide section and the spring coil layer.

10. The balloon guide catheter of claim 1, wherein: the inner diameter of the inner pipe is 2.18 mm-2.24 mm.

11. The balloon guide catheter of claim 9, wherein: the diameter of the round wire forming the spring coil layer is 0.0005 inches to 0.002 inches; or the flat wire forming the spring coil layer has a thickness of 0.0005 inches to 0.002 inches and a width of 0.001 inches to 0.004 inches.

12. The balloon guide catheter of claim 9, wherein: the pitch of the spring coil layer corresponding to the inner tube guide section is 0.0015 to 0.006 inches, and the pitch of the spring coil layer corresponding to the inner tube balloon section is 0.001 to 0.004 inches.