Balloon microcatheter for treating cerebral vascular stenosis

Abstract

The application discloses a balloon microcatheter for treating cerebral vascular stenosis and particularly relates to the technical field of medical devices, which comprises a guide wire and a catheter body sleeved outside the guide wire, a balloon is arranged on the catheter body, an expansion assembly for inflating the balloon is arranged on the catheter body, a stent is sleeved on the balloon, and a fixing assembly is arranged on the balloon; when the catheter body moves in the blood vessel, the fixing assembly fixes the stent on the balloon, and the fixing assembly is far away from the stent when the balloon expands. The balloon microcatheter for treating cerebral vascular stenosis has the advantages that the fixing assembly is arranged to abut against both ends of the stent, the fixing assembly is far away from the stent when the balloon expands, the fixing assembly can increase the stability between the stent and the balloon without affecting the support of the stent, the catheter is prevented from being punctured again during the operation, and the success rate of the operation is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a balloon microcatheter for treating cerebral vascular stenosis. Background Art

[0002] It is well known that cerebral vascular stenosis is one of the leading causes of stroke and other cerebrovascular diseases. Cerebral vascular stenosis is primarily caused by atherosclerosis, a disease that leads to lipid and calcification deposits on the vascular lining, narrowing the vessel lumen and obstructing blood flow to the brain. Traditionally, treatments for cerebral vascular stenosis include medication and surgery. Medication primarily includes antiplatelet and anticoagulant drugs to prevent thrombosis and promote blood flow. However, medication is limited in effectiveness for severely narrowed or completely occluded vessels. Surgical treatments include intracranial and extracranial vascular bypass grafting (ECBG) and carotid endarterectomy. While these procedures can directly address vascular stenosis, they carry high surgical risks and require a high level of patient fitness. In recent years, interventional therapies have become increasingly important in the treatment of cerebral vascular stenosis. Interventional therapies offer the advantages of minimal invasiveness and rapid recovery, primarily including intravascular stent implantation and balloon angioplasty. Stent implantation involves implanting a metal stent into the narrowed vessel segment to support the vessel wall and prevent re-stenosis.

[0003] For example, the Chinese patent document with the authorization announcement number CN112807553A and the announcement date of 2021-05-18, entitled "A Balloon Microcatheter", includes a catheter, a balloon, a developing ring, a catheter seat, a first outer tube, a second outer tube and a filling joint; the catheter is composed of a coaxial outer tube and an inner tube, the inner lumen of the catheter is a guidewire lumen, and the reinforcing rib structure on the catheter separates the annular channel between the inner tube and the outer tube into a first filling chamber and a second filling chamber, and a developing ring is fixedly connected to the catheter; the balloon is fixedly connected to the distal end of the catheter, and the inner lumen of the balloon is connected to both the first filling chamber and the second filling chamber. The advantages of this invention: preoperative balloon preparation makes exhaust easier and more thorough, shortens preoperative preparation time, avoids the problem of air embolism or poor balloon development effect; improves the problem of bending of the balloon and inner tube, and reduces the risk of excessive embolism caused by the "banana effect"; the balloon with a blocked filling channel can be retracted under a lower negative pressure, accelerates the balloon retraction process, and reduces the accident rate.

[0004] The deficiency of the existing technology is that during stent implantation, the stent is placed on a balloon, which enters the blood vessel through a catheter. When the balloon is placed at the location of blood vessel stenosis, the balloon is inflated to expand the stent, thereby achieving the purpose of supporting the blood vessel. However, when the balloon drives the stent through the tortuous position of the blood vessel, due to the connection method between the stent and the balloon, the stent and the balloon are prone to relative movement, and cannot accurately reach the location of blood vessel stenosis. The stent needs to be re-placed for surgery, which increases the risk of surgery. Summary of the Invention

[0005] The purpose of the present invention is to provide a balloon microcatheter for treating cerebral vascular stenosis to solve the above-mentioned deficiencies in the prior art.

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

[0007] A balloon microcatheter for treating cerebral vascular stenosis comprises a guidewire and a catheter body sleeved over the guidewire, a balloon disposed on the catheter body, an expansion assembly for inflating the balloon, a stent sleeved on the balloon, and a fixing assembly disposed on the balloon;

[0008] When the catheter body moves inside a blood vessel, the fixing component fixes the stent on the balloon. When the balloon expands, the fixing component moves away from the stent.

[0009] In the above-mentioned balloon microcatheter for treating cerebral vascular stenosis, the fixing assembly includes a plurality of abutments elastically arranged on the catheter body, and the abutments abut against the stent.

[0010] The above-mentioned balloon microcatheter for treating cerebral vascular stenosis is provided with a third through hole on the catheter body, a slider is provided in the sliding seal of the third through hole, and the abutment is located on the movement stroke of the slider.

[0011] The above-mentioned balloon microcatheter for treating cerebral vascular stenosis is provided with a sleeve on the catheter body, and a buffer component is provided on the sleeve.

[0012] In the above-mentioned balloon microcatheter for treating cerebral vascular stenosis, the buffer component includes a first sphere and a second sphere, and the first sphere is arranged outside the second sphere.

[0013] The above-mentioned balloon microcatheter for treating cerebral vascular stenosis is provided with a ventilation cavity in the catheter body, the second sphere is connected to the ventilation cavity, and a ventilation component is provided between the first sphere and the second sphere.

[0014] The above-mentioned balloon microcatheter for treating cerebral vascular stenosis, wherein the ventilation component includes a first through hole and a second through hole, wherein the first through hole and the second through hole are both provided on the sleeve, the first through hole is connected to the second sphere, and the second through hole is connected to the first sphere and the first through hole;

[0015] A blocking plate is slidably provided in the first through hole. The blocking plate has a first position for blocking the first through hole and the second through hole, and a second position for connecting the first through hole and the second through hole.

[0016] In the above-mentioned balloon microcatheter for treating cerebral vascular stenosis, the blocking plate is provided with air guide holes.

[0017] In the above-mentioned balloon microcatheter for treating cerebral vascular stenosis, a fixing block is provided on the blocking plate, a sliding groove is provided on the first through hole, and an elastic sheet is provided between the fixing block and the sliding groove.

[0018] The above-mentioned balloon microcatheter for treating cerebral vascular stenosis is provided with a catheter base on the catheter body, a Y-shaped connector on the catheter base, an inner cavity on the Y-shaped connector, and the inner cavity is connected to the ventilation cavity.

[0019] In the above technical solution, the present invention provides a balloon microcatheter for treating cerebral vascular stenosis, in which a fixing component is provided to abut the two ends of the stent, and when the balloon is inflated, the fixing component is away from the stent, so that the fixing component does not affect the support of the stent while increasing the stability between the stent and the balloon, thereby avoiding re-puncture of the catheter during the operation as much as possible and increasing the success rate of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0022] Figure 2 A schematic cross-sectional view of a catheter body according to another embodiment of the present invention during the process of entering a blood vessel;

[0023] Figure 3 for Figure 2 A magnified schematic diagram of the local structure at center A;

[0024] Figure 4 for Figure 3 A magnified schematic diagram of the local structure at point B in the middle;

[0025] Figure 5 A schematic cross-sectional view of a fully erected support provided by another embodiment of the present invention;

[0026] Figure 6 for Figure 5 A magnified schematic diagram of the local structure at point C in the middle;

[0027] Figure 7 for Figure 6 A magnified schematic diagram of the local structure at point D in the middle;

[0028] Figure 8 A schematic cross-sectional view of the air guide hole connecting the first through hole and the second through hole provided in another embodiment of the present invention;

[0029] Figure 9 for Figure 8 A magnified schematic diagram of the local structure at point E in the middle;

[0030] Figure 10 for Figure 9 Enlarged schematic diagram of the local structure at point F in the middle.

[0031] Description of reference numerals:

[0032] 1. Catheter body; 2. Guidewire cavity; 3. Stent; 4. Abutment; 401. First section; 402. Second section; 5. Axial groove; 6. Sleeve; 7. First sphere; 8. Second sphere; 9. Vent cavity; 10. Vent; 11. First through hole; 12. Second through hole; 13. Blocking plate; 14. Air guide hole; 15. Slider; 16. Slide; 17. Fixing block; 18. Elastic sheet; 19. Catheter base; 20. Y-type connector; 21. Inner cavity; 22. Screw cap; 24. Third through hole; 25. Balloon. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] In the description of the present invention, it should be understood that the terms "center", "length", "width", "degrees", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] Reference Figure 1-10 An embodiment of the present invention provides a balloon microcatheter for treating cerebral vascular stenosis, comprising a guidewire and a catheter body 1 sleeved on the outside of the guidewire, wherein a balloon 25 is provided on the catheter body 1, and an expansion component for inflating the interior of the balloon 25 is provided on the catheter body 1, a stent 3 is sleeved on the balloon 25, and a fixing component is provided on the balloon 25; when the catheter body 1 moves inside the blood vessel, the fixing component fixes the stent 3 on the balloon 25, and when the balloon 25 expands, the fixing component moves away from the stent 3.

[0036] Specifically, when treating cerebral vascular stenosis, after establishing access by puncturing the femoral artery, a guide catheter is introduced to the vicinity of the lesion, a guide wire (not shown) is introduced through the guide catheter, a guide wire lumen 2 is arranged in the catheter body 1, the guide wire lumen 2 penetrates through the catheter body 1, the guide wire lumen 2 is matched with the guide wire in radial size, the guide wire introduces the catheter body 1 into the blood vessel, a balloon 25 is arranged on the catheter body 1, a stent 3 is sleeved on the outer surface of the balloon 25, the stent 3 is made of metal material and is not retracted after being forced to stand up, the stent 3 is expanded, and the outer diameter is the same as the normal inner diameter of the blood vessel, the balloon 25 in the contracted state is guided by the guide wire to the stenosis area in the blood vessel, a plurality of air vents 10 are arranged on the catheter body 1, an expansion assembly is arranged on the catheter body 1 to inflate the balloon 25, the expansion assembly inflates the balloon 25 through the air vents 10 to make it expand, the balloon 25 expands and supports the stent 3 at the stenosis of the blood vessel, the stent 3 and the balloon 25 jointly apply force to the stenosis of the blood vessel, so that the blood vessel adapts to the shape of the balloon 25 and the stent 3, after the gas in the balloon 25 is removed, the balloon 25 is retracted, the balloon 25 can be withdrawn from the stent 3 by moving the catheter body 1, after the catheter body 1 exits the blood vessel, the stent 3 still supports in the diseased blood vessel, so that the stenosis area of the blood vessel cannot be restored, thereby ensuring the patency of the blood vessel, which is prior art and will not be described herein. One of the core innovations of the embodiment of the present application is that a fixing assembly is arranged on the balloon 25, the fixing assembly is distributed at both ends of the balloon 25, when the stent 3 is stood up, the fixing assembly is away from the stent 3, that is, the fixing assembly releases the fixation of the stent 3 when the balloon 25 is stood up, in the operation of treating cerebral vascular stenosis, the catheter body 1 needs to reach the stenosis of the blood vessel with the balloon 25 and the stent 3, during which there are tortuous blood vessels, since the fixing mode of the stent 3 and the balloon 25 is only sleeving, when passing through the tortuous blood vessels, the blood vessels apply force to the stent 3 and the balloon 25, so that the balloon 25 and the stent 3 have the possibility of displacement, therefore, when the catheter body 1 slides in the blood vessel, the stent 3 is fixed on the balloon 25 by the fixing assembly, so as to avoid the movement between the balloon 25 and the stent 3 as much as possible, so that when the balloon 25 is positioned to the blood vessel lesion area, the stent 3 is accurately positioned to the blood vessel lesion area, thereby supporting the stenosis of the blood vessel, reducing the probability of position deviation of the stent 3 and the balloon 25, thereby increasing the success rate of the operation.

[0037] Preferably, the fixing assembly includes a plurality of abutments 4 elastically arranged on the catheter body 1, and the abutments 4 abut against the stent 3. Specifically, the abutment 4 includes a first section 401 and a second section 402, and preferably there are four abutments 4, which are respectively arranged on the catheter body 1 at both ends of the stent 3 to fix the stent 3. An axial groove 5 is provided on the catheter body 1, and the abutment 4 is made of elastic material as a whole, so that the abutment 4 can rotate around the position connected to the axial groove 5, and the connection position (the connection area between the first section 401 and the catheter body 1) will be deformed and force will be stored during the rotation of the abutment 4. There is an obtuse angle between the first section 401 and the second section 402. When the first section 401 is rotated to be perpendicular to the catheter body 1, the distance between the two abutments 4 away from each other at one end in the radial direction is adapted to the normal blood vessel inner diameter (and the abutment 4 itself can be bent to adjust to the blood vessel diameter). The radial size of the tube is adapted), during the process of the catheter body 1 entering the blood vessel, the second section 402 abuts against the outer wall of the stent 3, and when the balloon 25 reaches the stenosis of the blood vessel, the balloon 25 is inflated, and the stent 3 is expanded during the expansion of the balloon 25. During the expansion of the stent 3, its edge position will drive the abutment 4 to swing away from the stent 3 and accumulate force for the abutment 4 itself. When the stent 3 is further expanded, the abutment 4 will move away from the stent 3. At this time, the elastic force of the abutment 4 itself is released to achieve automatic resetting of the abutment 4. At this time, the abutment 4 abuts against the balloon 25. When the balloon 25 is deflated, the abutment 4 will also rotate in the direction of the balloon 25, so that the abutment 4 and the catheter body 1 can exit the blood vessel together.

[0038] As another embodiment of the present invention, a third through hole 24 is provided on the catheter body 1, and a slider 15 is provided in the sliding seal in the third through hole 24, and the abutment 4 is located on the movement stroke of the slider 15. Specifically, the slider 15 is provided in the third through hole 24, and the third through hole 24 is connected to the axial groove 5 and the vent 10. The length of the slider 15 is greater than the length of the axial groove 5, so that the slider 15 does not separate from the axial groove 5, and the radial dimension of the connection position of the vent 10 and the third through hole 24 is smaller than the radial dimension of the slider 15, so that the slider 15 does not enter the vent 10. The force required to inflate the balloon 25 is smaller than the force required for the slider 15 to push the abutment 4 to rotate. The effect of such a setting is that when the catheter body 1 reaches the narrow part of the blood vessel, the end of the vent 10 close to the guidewire cavity 2 is inflated, and the gas will generate an extrusion force on the slider 15, causing the slider 15 to slide in the direction close to the abutment 4, causing the slider 15 to abut against the abutment 4, thereby causing the abutment 4 to move away from the stent 3. , and the resist 4 changes from an inclined state to a vertical state. When the resist 4 is in a vertical state, the end thereof away from the axial groove 5 abuts against the inner wall of the blood vessel (the resist 4 itself is made of elastic material and can be bent to adapt to blood vessels of different sizes). After the expansion of the blood vessel is completed, the pressure on the balloon 25 is released, and the force of the gas on the slider 15 disappears. At this time, the elastic force of the resist 4 is released to realize automatic resetting of the resist 4. The benefits brought by the resist 4 in this process are: first, it abuts against the bracket 3 to fix the position of the bracket 3; second, it drives the resist 4 away from the bracket 3 to realize passive unlocking of the bracket 3; third, when the resist 4 is transferred from the inclined state to the vertical state, it abuts against the inner wall of the blood vessel to realize flexible positioning of the balloon 25, thereby improving the stability of the balloon 25 during expansion.

[0039] As another embodiment provided by the present invention, the catheter body 1 is provided with a sleeve 6, and the sleeve 6 is provided with a buffer assembly. Specifically, the sleeve 6 is sleeved on the catheter body 1, and preferably two sleeves 6 are located at both ends of the catheter body 1 relative to the stent 3. The sleeve 6 is provided with a buffer assembly. When the balloon 25 is inflated, the balloon 25 can be expanded. Since the expansion of the balloon 25 exerts a force on the blood vessel, there is a possibility that the balloon 25 will expand rapidly and rupture the blood vessel. The buffer assembly allows the balloon 25 to be slowly inflated, further ensuring the safety of the operation.

[0040] Preferably, the buffer assembly includes a first sphere 7 and a second sphere 8, the first sphere 7 is arranged outside the second sphere 8; a ventilation cavity 9 is provided in the catheter body 1, the second sphere 8 is connected to the ventilation cavity 9, and a ventilation assembly is provided between the first sphere 7 and the second sphere 8. Specifically, that is, in this embodiment, the balloon 25 is divided into an inner and outer layer, the two ends of the first sphere 7 are respectively fixed to the two sleeves 6, and the two ends of the second sphere 8 are also fixed to the two sleeves 6. The first sphere 7 completely covers the outer surface of the second sphere 8, and the ventilation cavity 9 is provided in the catheter body 1. Its radius is larger than the diameter of the guidewire cavity 2 and is not connected to the guidewire cavity 2. The vent 10 connects the ventilation cavity 9 and the second sphere 8. A ventilation assembly is provided between the first sphere 7 and the second sphere 8. When the first sphere 7 and the second sphere 8 reach the narrowed part of the blood vessel, they are inflated through the ventilation cavity 9, and the gas is discharged from the vent 1 0 enters the second sphere 8. During the inflation process, the second sphere 8 will drive the first sphere 7 and the bracket 3 to prop up. When the second sphere 8 reaches the maximum expansion volume, the second sphere 8 inflates the first sphere 7 through the ventilation component, so that the first sphere 7 reaches the maximum expansion volume. At this time, the outer wall of the bracket 3 is in close contact with the inner wall of the blood vessel. The purpose of this setting is that the second sphere 8 inflates the first sphere 7, which buffers the expansion speed of the first sphere 7 and makes the blood vessel more evenly stressed. At the same time, when the second sphere 8 is full, it can be used as a stage observation to determine whether to continue to inflate the first sphere 7.

[0041] Preferably, the ventilation assembly includes a first through hole 11 and a second through hole 12, the first through hole 11 and the second through hole 12 are both arranged on the sleeve 6, the first through hole 11 is connected to the second sphere 8, and the second through hole 12 is connected to the first sphere 7 and the first through hole 11; a blocking plate 13 is slidingly arranged in the first through hole 11, and the blocking plate 13 has a first position for blocking the first through hole 11 and the second through hole 12, and the blocking plate 13 has a second position for connecting the first through hole 11 and the second through hole 12. Specifically, the radial dimensions of the first through hole 11 and the second through hole 12 are smaller than the radial dimensions of the vent 10, the first through hole 11 penetrates the sleeve 6 in the axial direction, the first sphere 7 and the second sphere 8 are connected through the first through hole 11 and the second through hole 12, a blocking plate 13 is provided in the first through hole 11 for sliding sealing, the blocking plate 13 is approximately L-shaped, the length of its horizontal section is greater than the length of its vertical section, and the vertical section of the blocking plate 13 is provided with an inclined surface toward the abutment 4 in the direction close to the abutment 4, the horizontal section of the blocking plate 13 is slidably provided in the first through hole 11, and when the catheter body 1 enters the blood vessel, the blocking plate 13 is in the first position, at which time the blocking plate 13 is vertically The segment is at a certain distance from the end face of the sleeve 6, and the horizontal segment of the blocking plate 13 blocks the second through hole 12, that is, only the second sphere 8 can be expanded by inflation. When the second sphere 8 is fully inflated, an existing linear drive component is used to control the blocking plate 13 to switch from the first position to the second position. At this time, the horizontal segment of the blocking plate 13 exposes the second through hole 12, that is, while the second sphere 8 is inflated, the gas can inflate the first sphere 7 through the second through hole 12, thereby realizing the sequential inflation of the second sphere 8 and the first sphere 7. When the blood vessel expansion is completed, the blocking plate 13 is in the second position, and the first sphere 7 and the second sphere 8 can be depressurized at the same time.

[0042] In order to facilitate the switching of the blocking plate 13 between the first position and the second position, preferably, a fixing block 17 is provided on the blocking plate 13, a sliding groove 16 is provided on the first through hole 11, and an elastic sheet 18 is provided between the fixing block 17 and the sliding groove 16; and an air guide hole 14 is provided on the blocking plate 13. Specifically, the slide groove 16 is opened on the inner wall of the first through hole 11, the fixed block 17 is a protruding structure on the blocking plate 13, and the elastic sheet 18 is also made of elastic material, that is, after it is elastically deformed by pressure, it has the ability to automatically recover. The air guide hole 14 is approximately L-shaped, and the horizontal section of the air guide hole 14 is parallel to the first through hole 11, and the vertical section is parallel to the second through hole 12. The elastic force provided by the resisting member 4 itself is greater than the force required for the elastic sheet 18 to deform. The effect of such a setting is that when the second sphere 8 reaches the maximum expansion volume, it continues to be inflated so that the blocking plate 13 is under pressure, which drives the fixed block 17 to move toward the resisting member 4 and forces the elastic sheet 18 to undergo elastic deformation and accumulate force. When the blood vessel expansion is completed, the second sphere 8 is depressurized. At this time, the elastic force of the elastic sheet 18 is released, so that the blocking plate 1 3 moves toward the direction of the second sphere 8 to achieve automatic reset of the blocking plate 13. At this time, the gas inside the first sphere 7 has not yet been released. To solve this problem, the elastic force of the resisting member 4 is released at this time to achieve the reverse rotation of the resisting member 4. Since in this process, the stent 3 supports the blood vessel and does not return, that is, the stent 3 remains inside the blood vessel, the abutting effect of the stent 3 will be reduced. At this time, the resisting member 4 will further rotate in the reverse direction, that is, the reverse rotation angle of the resisting member 4 will be greater than the previous forward rotation angle, which will cause the resisting member 4 to abut against the vertical section of the blocking plate 13 and force the blocking plate 13 to move further toward the direction of the second sphere 8, that is, the two ends of the air guide hole 14 connect the first sphere 7 with the second sphere 8, thereby completing the passive pressure relief of the first sphere 7, so as to facilitate the extraction of the balloon 25 from the blood vessel.

[0043] To sum up, the abutment 4 has the following advantages: first, it abuts against the stent 3 to improve the stability of the stent 3 during transportation; second, it abuts against the blood vessel to achieve flexible positioning of the balloon 25; third, it drives the air guide hole 14 to connect the first through hole 11 and the second through hole 12 to achieve passive pressure relief of the first sphere 7.

[0044] In order to facilitate the introduction of the catheter body 1 into the blood vessel and to facilitate the inflation of the ventilation cavity 9, a catheter base 19 is provided on the catheter body 1, and a Y-shaped connector 20 is provided on the catheter base 19. The Y-shaped connector 20 is provided with an inner cavity 21, and the inner cavity 21 is connected to the ventilation cavity 9. Specifically, the proximal end of the catheter body 1 is provided with a catheter base 19, and the catheter body 1 is sleeved in the catheter base 19. The catheter base 19 is provided with a Y-shaped connector 20, that is, the Y-shaped connector 20 and the catheter base 19 form an angle, and the inner cavity 21 is provided in the Y-shaped connector 20, and the inner cavity 21 is connected to the ventilation cavity 9. A screw cap 22 is provided at the end of the Y-shaped connector 20, and the screw cap 22 is threadedly connected to the Y-shaped connector 20. When the device is used, the screw cap 22 is unscrewed, and the expansion assembly inflates the ventilation cavity 9 through the inner cavity 21. The entering gas causes the first sphere 7 and the second sphere 8 to expand.

[0045] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A balloon microcatheter for treating cerebral vascular stenosis, comprising a guidewire and a catheter body sleeved on the outside of the guidewire, a balloon provided on the catheter body, an expansion assembly provided on the catheter body for inflating the interior of the balloon, and a stent sleeved on the balloon, characterized in that: The balloon is provided with a fixing component; When the catheter body moves inside the blood vessel, the fixing component fixes the stent on the balloon, and when the balloon is expanded, the fixing component moves away from the stent; The fixing assembly includes a plurality of abutments elastically arranged on the catheter body, and the abutments abut against the bracket; The catheter body is provided with a third through hole, a slider is provided in the third through hole for sliding sealing, and the abutment is located on the movement stroke of the slider.

2. The balloon microcatheter for treating cerebral vascular stenosis according to claim 1, characterized in that: A sleeve is provided on the catheter body, and a buffer component is provided on the sleeve body.

3. The balloon microcatheter for treating cerebral vascular stenosis according to claim 2, characterized in that: The buffer assembly includes a first sphere and a second sphere, wherein the first sphere is disposed outside the second sphere.

4. The balloon microcatheter for treating cerebral vascular stenosis according to claim 3, characterized in that: A ventilation cavity is provided in the catheter body, the second sphere is connected to the ventilation cavity, and a ventilation component is provided between the first sphere and the second sphere.

5. The balloon microcatheter for treating cerebral vascular stenosis according to claim 4, characterized in that: The catheter body is provided with a catheter base, the catheter base is provided with a Y-shaped connector, the Y-shaped connector is provided with an inner cavity, and the inner cavity is connected to the ventilation cavity.

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