Cutting balloon catheter

Abstract

The present application relates to a kind of cutting balloon catheter, it includes catheter, balloon, spiral guide rail, cutting piece and adjusting piece, catheter is provided with the first cavity for guide wire and the second cavity for gas or liquid, balloon is sleeved in the outer periphery of catheter distal end, balloon interior is communicated with the second cavity, spiral guide rail is attached and wound in the outside of balloon, cutting piece is slidably connected on spiral guide rail, adjusting piece is telescopically connected between cutting piece and catheter proximal end along catheter axis, balloon and spiral guide rail all have radial shrinkage state and expansion state, spiral guide rail can expand along with the expansion of balloon, shrink along with the shrinkage of balloon, when balloon and spiral guide rail are in expansion state, make adjusting piece elongation or shrinkage, cutting piece has the tendency of sliding along spiral guide rail, cutting piece is cut vascular lesion plaque while sliding along spiral guide rail.The cutting balloon catheter of the present application can realize more efficient, safe cutting vascular lesion plaque.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, and particularly relates to a cutting balloon catheter. BACKGROUND

[0002] The conventional cutting balloon will have multiple longitudinally arranged blades outwardly braced at the same time to cut the soft plaque and the intima of the blood vessel to a certain extent, so that the balloon is easier to open. The cutting content of the conventional cutting balloon is limited, the repeated cutting effect is affected by the balloon expansion performance, and high-efficiency and accurate cutting in the required range cannot be achieved, which is easy to cause damage to the intima of the blood vessel. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a cutting balloon catheter capable of achieving more efficient cutting of vascular lesion plaques.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is:

[0005] A cutting balloon catheter comprises:

[0006] A catheter provided with a first cavity for passing a guide wire and a second cavity for passing a gas or a liquid, the first cavity and the second cavity respectively extending along the axial direction of the catheter;

[0007] A balloon sleeved on the outer periphery of the distal end of the catheter, the interior of the balloon being in communication with the second cavity;

[0008] A spiral guide rail attached and wound on the outside of the balloon, the proximal end of the spiral guide rail being fixedly connected with the proximal end of the balloon, and the distal end of the spiral guide rail being fixedly connected with the distal end of the balloon.

[0009] A cutting member slidably connected to the spiral guide rail,

[0010] An adjusting member telescopically connected between the cutting member and the proximal end of the catheter along the axial direction of the catheter,

[0011] The balloon and the spiral guide rail both have a radially contracted state and an expanded state, the spiral guide rail can expand with the expansion of the balloon and contract with the contraction of the balloon,

[0012] When the balloon and the spiral guide rail are in the expanded state and the adjusting member is elongated or contracted, the cutting member has a tendency to slide along the spiral guide rail, and the cutting member cuts the lesion plaque in the blood vessel while sliding along the spiral guide rail.

[0013] The present application is a variable-diameter spiral guide rail mounted on the balloon surface of a balloon dilatation catheter, and a cutting element on the spiral guide rail is controlled by an adjusting element to rotate along the spiral guide rail around the circumference of the balloon while moving towards the distal end or the proximal end of the balloon in the axial direction, so as to accurately control the cutting range according to the size of the lesion site, realize the controllability of the soft plaque cutting position in the axial direction of the blood vessel, and realize efficient removal of the vascular lesion plaque through repeated cutting back and forth.

[0014] The balloon of the cutting balloon catheter of the present application is inflated by introducing gas or liquid into the balloon, and the balloon is inflated by increasing the pressure, and the balloon is deflated by reducing the pressure by pumping the liquid or gas in the balloon. The outer diameter of the balloon can be adjusted at any time by increasing and decreasing the pressure, so that the outer diameter of the spiral guide rail thereon is adjusted to an appropriate size, and the cutting depth of the cutting element is more suitable for the lesion site, thereby effectively reducing the damage to the inner wall of the blood vessel.

[0015] Preferably, the adjusting element comprises a first part and a second part, the first part is attached to the outside of the spiral guide rail, the first part is in a hypodermic tube structure that can be extended in the axial direction of the catheter, the second part is rotatably sleeved on the outside of the catheter, the second part is in a spring ring structure, the proximal end of the first part is fixedly connected with the distal end of the second part, the distal end of the first part is fixedly connected with the cutting element, the proximal end of the second part is rotatably connected with the proximal end of the catheter, the first part further has a radial contraction state and an expansion state, and can expand with the expansion of the spiral guide rail and contract with the contraction of the spiral guide rail, when the second part rotates in one direction, the first part is in a spiral spring state, driving the cutting element to slide along the spiral guide rail towards the proximal end of the balloon, when the second part rotates in the other direction, the first part is in a spiral spring state, the distal end of the adjusting element is elongated, driving the cutting element to slide along the spiral guide rail towards the distal end of the balloon.

[0016] In the present application, the distal end of the spiral guide rail is fixedly connected with the distal end of the balloon, and the proximal end of the spiral guide rail is fixedly connected with the proximal end of the balloon.

[0017] According to some specific embodiments, the proximal end of the spiral guide rail is provided with a first fixing ring, the distal end of the spiral guide rail is provided with a second fixing ring, the first fixing ring is fixedly sleeved on the proximal end of the balloon, and the second fixing ring is fixedly sleeved on the distal end of the balloon.

[0018] For example, in some embodiments, when the second part rotates clockwise, the first part is driven to spiral up clockwise like a coil spring, the cutting member is driven to slide along the spiral rail and move towards the proximal end of the balloon; when the second part rotates counterclockwise, the first part is driven to spiral down counterclockwise like a coil spring, the distal end of the adjusting member is elongated, and the cutting member is driven to slide along the spiral rail and move towards the distal end of the balloon.

[0019] Further, the first part has a radially contracted state and an expanded state, which can expand with the expansion of the spiral rail and contract with the contraction of the spiral rail, avoiding the interference of the adjusting member with the balloon expansion.

[0020] According to some specific embodiments, the adjusting member further comprises an operating ring, which is rotatably sleeved on the proximal end of the catheter, and the proximal end of the second part is fixedly connected with the operating ring, which is more convenient to operate.

[0021] According to some specific embodiments, the first part and the second part are integrally formed or connected by welding.

[0022] Preferably, the cutting member comprises an annular seat sleeved outside the spiral rail and a cutting part arranged on the annular seat, the annular seat, the balloon and the catheter are coaxial, and the annular seat has a radially contracted state and an expanded state, which can expand with the expansion of the spiral rail and contract with the contraction of the spiral rail. The annular seat can provide a certain radial support force while cutting, so that the cutting force can be transmitted to the soft plaque of the lesion.

[0023] Further preferably, a plurality of the cutting parts are distributed along the circumference of the annular seat, which is beneficial to improve the cutting efficiency.

[0024] Further preferably, the cutting part is arranged obliquely relative to the axis of the catheter, and the oblique direction is substantially the same as the spiral winding direction of the spiral rail.

[0025] Further preferably, the annular seat is in a wave shape formed by the wave crests and troughs connected in sequence in the circumferential direction, which can realize rapid diameter change.

[0026] Still further preferably, a cutting part is arranged on one side of the trough between two adjacent wave crests, and the side is obliquely arranged relative to the axis of the catheter, and the oblique direction is substantially the same as the spiral winding direction of the spiral rail.

[0027] Further preferably, the inner surface of the annular seat is provided with a limiting clamping groove, and the spiral rail is embedded in the limiting clamping groove.

[0028] Further preferably, the cross section of the cutting part is triangular or wedge-shaped.

[0029] Preferably, the spiral guide rail comprises a plurality of guide rails arranged at intervals on the outside of the balloon, and the spiral winding directions of the plurality of guide rails are the same.

[0030] Further preferably, the proximal ends of the plurality of spiral guide rails are fixed at intervals on the first fixing ring, and the distal ends of the plurality of spiral guide rails are fixed at intervals on the second fixing ring.

[0031] According to some embodiments, the inner surface of the annular seat is arranged with a plurality of limiting clamping grooves, each of the guide rails is embedded in one of the limiting clamping grooves, so that the stability of the distal end structure of the cutting balloon catheter is improved, and the cutting stability is ensured.

[0032] Further preferably, the number of the guide rails is 2-5, and further preferably 2-3.

[0033] Further preferably, the number of winding turns of the spiral guide rail in the circumferential direction of the balloon is 0.8-2, which can achieve rapid diameter change.

[0034] The spiral guide rail, the first part and the annular seat used in the application all have a memory function, and can be restored to the initial state when the balloon is contracted.

[0035] Preferably, the cutting balloon catheter further comprises a catheter seat arranged at the proximal end of the catheter, the catheter seat has a main channel and a branch channel, the included angle between the main channel and the branch channel is an acute angle, the proximal end of the main channel is connected to the outside, the distal end of the main channel is connected to the proximal end of the first cavity, and the main channel and the first cavity are coaxial, the proximal end of the branch channel is connected to the outside, and the distal end of the branch channel is connected to the second cavity.

[0036] The proximal end opening of the main channel is a guide wire port. The proximal end opening of the branch channel is a pressure increasing and releasing port, which can be connected to a pressure increasing and releasing device.

[0037] Preferably, when the balloon changes from an expanded state to a contracted state, the balloon rotates axially to form a plurality of coiled petals.

[0038] Thanks to the above technical solutions, the application has the following advantages compared with the prior art:

[0039] The present application installs the variable diameter spiral guide rail outside the balloon, installs the cutting member on the guide rail, controls the cutting member on the spiral guide rail through the adjusting member, and makes the cutting member rotate along the spiral guide rail around the circumference of the balloon while moving to the distal end or the proximal end along the axial direction of the balloon, so that the cutting range can be accurately controlled according to the size of the lesion site, the soft plaque cutting position in the axial direction of the blood vessel can be controlled, the blood vessel lesion plaque can be efficiently removed through repeated cutting back and forth, the cutting balloon catheter structure of the present application is compact, stable, convenient to use and high in safety. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0041] Figure 1 The structure schematic diagram of the cutting balloon catheter of the embodiment in the balloon contraction state;

[0042] Figure 2 The structure schematic diagram of the cutting balloon catheter of the embodiment in the balloon expansion state;

[0043] Figure 3 The structure schematic diagram of the distal end part of the cutting balloon catheter of the embodiment;

[0044] Figure 4 The structure schematic diagram of the cutting member and the adjusting member of the cutting balloon catheter of the embodiment;

[0045] Figure 5 The local structure schematic diagram of the cutting member and the adjusting member of the cutting balloon catheter of the embodiment;

[0046] Figure 6 The structure schematic diagram of the cutting member of the cutting balloon catheter of the embodiment in the contraction state;

[0047] Figure 7 The structure schematic diagram of the cutting member and the balloon of the cutting balloon catheter of the embodiment in the contraction state;

[0048] Figure 8 The structure schematic diagram of the cutting member of the cutting balloon catheter of the embodiment in the expansion state;

[0049] Figure 9 The structure schematic diagram of the cutting member and the balloon of the cutting balloon catheter of the embodiment in the expansion state;

[0050] Figure 10Structure schematic view of the cutting member and the spiral guide rail connection of the cutting balloon catheter of the embodiment;

[0051] Figure 11 is a partial enlarged view of Figure 10

[0052] Figure 12 Structure schematic view of the cutting balloon catheter of the embodiment in a blood vessel;

[0053] Figure 13 Operation schematic view of the cutting balloon catheter of the embodiment in use;

[0054] In the above figures:

[0055] 1, catheter; 2, balloon; 3, spiral guide rail; 31, first fixing ring; 31, second fixing ring; 41, annular seat; 411, limiting clamping groove; 42, cutting part; 51, first part; 52, second part; 53, operation ring; 6, catheter seat; 61, main channel; 62, branch channel; 7, guide wire; 8, blood vessel; 9, soft plaque of lesion. DETAILED DESCRIPTION

[0056] Hereinafter, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0057] In the description of the present application, it is understood that the distal end refers to the end of the instrument or component far away from the operator, the proximal end refers to the end of the instrument or component close to the operator; the axial direction refers to the direction parallel to the center line of the distal end and the proximal end of the instrument or component, the radial direction refers to the direction perpendicular to the axial direction; the inner and outer are defined as the position relative to the center of the instrument or component, wherein the inner is the position close to the center of the instrument or component, and the outer is the position away from the center of the instrument or component. The above orientation words are only for the convenience of describing the embodiments of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0058] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "fixed" and the like should be understood broadly, for example, can be fixedly connected, can be detachably connected, or can be integrated. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0059] In the description of the present application, multiple refers to two or more. ​

[0060] The components of the cutting balloon catheter of the present application can be made of materials conventionally used in the art.

[0061] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity, the elements and settings of particular examples in the following description are set forth by way of illustrations. Of course, they are merely examples and are not intended to limit the present application.

[0062] The embodiments of the present application will be described in detail below with reference to the drawings.

[0063] As shown in the drawings, Figures 1-13 The present embodiment provides a cutting balloon catheter and a method of using the same, which includes a catheter 1, a balloon 2, a cutting member and an adjusting member.

[0064] The catheter 1 is provided with a first cavity for passing a guide wire 7 and a second cavity for passing a gas or liquid, which extend along the axial direction of the catheter 1. The balloon 2 is sleeved on the outer periphery of the distal end of the catheter 1, and the interior of the balloon 2 is in communication with the second cavity. The cutting balloon catheter further includes a catheter hub 6 provided on the proximal end of the catheter 1, which has a main passage 61 and a branch passage 62. The included angle between the main passage 61 and the branch passage 62 is an acute angle. The proximal end of the main passage 61 is in communication with the outside, and the distal end of the main passage 61 is in communication with the proximal end of the first cavity, and the main passage 61 is coaxial with the first cavity. The proximal end of the branch passage 62 is in communication with the outside, and the distal end of the branch passage 62 is in communication with the second cavity. The proximal end opening of the main passage 61 is a guide wire port, and the proximal end opening of the branch passage 62 is a pressure relief port, which can be in communication with a pressure relief device. In the present embodiment, the catheter hub 6 is Y-shaped. The balloon 2 has an expanded state and a contracted state. The balloon 2 is expanded by being pressurized by passing a gas or liquid into the balloon 2, and the balloon 2 is contracted by being depressurized by sucking the liquid or gas in the balloon 2. In the present embodiment, when the balloon 2 changes from the expanded state to the contracted state, the balloon 2 rotates axially to form a plurality of coiled petals.

[0065] A helical guide rail 3 is attached and wound on the outside of the balloon 2. The helical guide rail 3 has a radially contracted state and an expanded state, and can expand with the expansion of the balloon 2 and contract with the contraction of the balloon 2. The proximal end of the helical guide rail 3 is fixedly provided with a first fixed ring 31, and the distal end is fixedly provided with a second fixed ring 32. The first fixed ring 31 is fixedly sleeved on the proximal end of the balloon 2, and the second fixed ring 32 is fixedly sleeved on the distal end of the balloon 2. The helical guide rail 3 includes a plurality of guide rails spaced apart on the outside of the balloon 2, and the helical winding directions of the plurality of guide rails are the same. In the present embodiment, the helical guide rail 3 includes four tracks, and each guide rail has one winding turn in the circumferential direction of the balloon 2.

[0066] The cutting member is slidably connected to the helical guide rail 3. The adjusting member is telescopically connected between the cutting member and the proximal end of the catheter 1 along the axial direction of the catheter 1. When the balloon 2 and the helical guide rail 3 are in the expanded state, the adjusting member is elongated or contracted, the cutting member has a tendency to slide along the helical guide rail 3, and the cutting member cuts the plaque 9 of the vascular lesion while sliding along the helical guide rail 3.

[0067] In the embodiment, the cutting member includes an annular seat 41 sleeved outside the helical guide rail 3 and a cutting part 42 arranged on the annular seat 41. The annular seat 41, the balloon 2 and the catheter 1 are coaxial. The annular seat 41 has a radial contraction state and an expansion state, and can expand with the expansion of the helical guide rail 3 and contract with the contraction of the helical guide rail 3. The annular seat 41 has a wave shape formed by the connection of mutually staggered wave crests and troughs in the circumferential direction. The cutting part 42 is arranged on one side of the trough between two adjacent wave crests. The side is inclined relative to the axis of the catheter 1, and the inclination direction is substantially the same as the helical winding direction of the helical guide rail 3. The inclination direction of the cutting part 42 on the side is also substantially the same as the helical winding direction of the helical guide rail 3. The cross section of the cutting part 42 is triangular or wedge-shaped. The inner surface of the annular seat 41 is provided with limiting clamping grooves 411. The helical guide rail 3 is embedded in the limiting clamping grooves 411. The number of limiting clamping grooves 411 is the same as the number of guide rails. Each guide rail is embedded in a corresponding limiting clamping groove 411.

[0068] In the embodiment, the adjusting member includes a first part 51 telescopically arranged outside the helical guide rail 3 along the axial direction of the catheter 1 and a second part 52 sleeved outside the catheter 1. The first part 51 has a hypotube structure, and the second part 52 has a spiral structure. The proximal end of the first part 51 is fixedly connected to the distal end of the second part 52. The distal end of the first part 51 is fixedly connected to the cutting member. The proximal end of the second part 52 is rotatably connected to the proximal end of the catheter 1. The first part 51 has a radial contraction state and an expansion state, and can expand with the expansion of the helical guide rail 3 and contract with the contraction of the helical guide rail 3. The cutting balloon catheter further includes an operating ring 53 rotatably sleeved on the proximal end of the catheter 1. The proximal end of the second part 52 is fixedly connected to the operating ring 53. The cutting balloon catheter further includes the operating ring 53 rotatably sleeved on the proximal end of the catheter 1. The proximal end of the second part 52 is fixedly connected to the operating ring 53. The adjusting member can be driven to work by rotating the operating ring 53.

[0069] When the operating ring 53 is rotated clockwise, the second part 52 rotates clockwise, and the first part 51 is wound like a spring and is tightened clockwise, and the cutting member slides along the spiral guide rail 3 and approaches the proximal end of the balloon 2; when the operating ring 53 is rotated counterclockwise, the second part 52 rotates counterclockwise, and the first part 51 is wound like a spring and is loosened counterclockwise, and the adjusting member is elongated, and the cutting member slides along the spiral guide rail 3 and approaches the distal end of the balloon 2.

[0070] In this embodiment, the spiral guide rail 3, the first part 51 and the annular seat 41 all have a memory function and can be restored to the initial state when the balloon 2 is contracted.

[0071] The preparation method of the cutting balloon catheter in this embodiment is as follows:

[0072] A) After the balloon is folded according to the memory, the spiral guide rail 3 is installed on the outer circumferential surface of the balloon, so that the spiral guide rail 3 can smoothly change the diameter under the action of the balloon pressure, and the spiral guide rail 3 after changing the diameter can be attached to the outer circumferential vascular lesion tissue;

[0073] B) The cutting member, the first part 51, the second part 52 and the operating ring 53 are connected by welding;

[0074] C) The distal end of the catheter 1 passes through the operating ring 53, the second part 52, the first part 51 and the cutting member in sequence, and then the balloon of step A) is installed at the distal end of the catheter 1, and the cutting member is installed on the spiral guide rail 3 through the limiting clamping groove 411.

[0075] The use method of the cutting balloon catheter in this embodiment is as follows:

[0076] 1) The distal end of the cutting balloon catheter is sent to the lesion site along the guide wire 7;

[0077] 2) The balloon 2 is pressurized, the balloon 2 is expanded, and the spiral guide rail 3, the annular seat 41 and the first part 51 are expanded;

[0078] 3) The cutting member is slid along the guide rail by rotating the operating ring 53 counterclockwise and / or clockwise, and the soft plaque 9 is cut;

[0079] 4) After cutting, the balloon 2 is contracted by negative pressure, and the spiral guide rail 3, the annular seat 41 and the first part 51 are contracted, and the cutting balloon catheter is withdrawn along the guide wire 7.

[0080] The above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A cutting balloon catheter, characterized by: The cutting balloon catheter comprises: a catheter provided with a first cavity for a guide wire to pass through and a second cavity for gas or liquid to pass through, the first cavity and the second cavity respectively extend along the axial direction of the catheter; a balloon sleeved on the outer periphery of the distal end of the catheter, the interior of the balloon communicates with the second cavity; a spiral rail attached and wound on the exterior of the balloon, the proximal end of the spiral rail is fixedly connected with the proximal end of the balloon, and the distal end of the spiral rail is fixedly connected with the distal end of the balloon, the balloon and the spiral rail both have a contracted state and an expanded state, the spiral rail can expand along with the expansion of the balloon and contract along with the contraction of the balloon, a cutting member slidably connected on the spiral rail, the cutting member comprises an annular seat sleeved on the exterior of the spiral rail and a cutting part arranged on the annular seat, the annular seat, the balloon and the catheter are coaxial, the annular seat has a radial contracted state and an expanded state, and can expand along with the expansion of the spiral rail and contract along with the contraction of the spiral rail, an adjusting member telescopically connected between the cutting member and the proximal end of the catheter along the axial direction of the catheter, when the balloon and the spiral rail are in the expanded state, the cutting member has a tendency to slide along the spiral rail when the adjusting member is elongated or contracted, the cutting member cuts the plaque of the lesion in the blood vessel while sliding along the spiral rail, the adjusting member comprises a first part and a second part, the first part is attached and sleeved on the exterior of the spiral rail, the first part has a hypotube structure capable of telescopically extending along the axial direction of the catheter, the second part is rotatably sleeved on the exterior of the catheter, the second part has a spring ring structure, the proximal end of the first part is fixedly connected with the distal end of the second part, the distal end of the first part is fixedly connected with the cutting member, and the proximal end of the second part is rotatably connected with the proximal end of the catheter, the first part also has a radial contracted state and an expanded state, and can expand along with the expansion of the spiral rail and contract along with the contraction of the spiral rail, when the second part is rotated in a direction, the first part is spirally tightened like a coil spring, and drives the cutting member to slide along the spiral rail towards the proximal end of the balloon, when the second part is rotated in another direction, the first part is spirally relaxed like a coil spring, and drives the cutting member to slide along the spiral rail towards the distal end of the balloon.

2. The cutting balloon catheter of claim 1, wherein: The proximal end of the spiral rail is provided with a first fixing ring, and the distal end of the spiral rail is provided with a second fixing ring, the first fixing ring is fixedly sleeved on the proximal end of the balloon, and the second fixing ring is fixedly sleeved on the distal end of the balloon.

3. The cutting balloon catheter of claim 1, wherein: The adjusting member further comprises an operating ring rotatably sleeved on the proximal end of the catheter, and the proximal end of the second part is fixedly connected with the operating ring. And / or, the first part and the second part are integrally formed by a wire or connected by welding.

4. The cutting balloon catheter of claim 1, wherein: The cutting portions are arranged along the circumference of the annular seat; The annular seat is in a wave shape with staggered peaks and valleys in the circumferential direction; The cutting portions are arranged obliquely relative to the axis of the catheter, and the oblique direction is substantially the same as the spiral winding direction of the spiral guide rail; The inner surface of the annular seat is provided with a limiting slot, and the spiral guide rail is embedded in the limiting slot; The cross section of the cutting portion is triangular or wedge-shaped.

5. The cutting balloon catheter of claim 1, wherein: The spiral guide rail comprises a plurality of guide rails arranged on the outside of the balloon, and the spiral winding directions of the guide rails are the same.

6. The cutting balloon catheter of claim 5, wherein: The number of the guide rails is 2-5; The number of the spiral winding turns of the spiral guide rail in the circumferential direction of the balloon is 0.8-2.

7. The cutting balloon catheter of claim 1, wherein: The cutting balloon catheter further comprises a catheter seat arranged at the proximal end of the catheter, the catheter seat has a main channel and a branch channel, the included angle between the main channel and the branch channel is an acute angle, the proximal end of the main channel is connected to the outside, the distal end of the main channel is connected to the proximal end of the first cavity, and the main channel and the first cavity are coaxial, the proximal end of the branch channel is connected to the outside, and the distal end of the branch channel is connected to the second cavity.

8. The cutting balloon catheter of claim 1, wherein: When the balloon changes from the expanded state to the contracted state, the balloon rotates axially to form a plurality of coiled petals.

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