CN115350382B

CN115350382B - Cutting balloon dilation catheter

Info

Publication number: CN115350382B
Application number: CN202210984138.4A
Authority: CN
Inventors: 刘朝生; 张志军; 杨武锋
Original assignee: Guangdong Bomai Medical Technology Co Ltd
Current assignee: Guangdong Bomai Medical Technology Co Ltd
Priority date: 2022-08-18
Filing date: 2022-08-18
Publication date: 2023-06-06
Anticipated expiration: 2042-08-18
Also published as: CN115350382A

Abstract

The invention discloses a cutting balloon dilation catheter, which comprises a catheter piece, a balloon and a cutting assembly, wherein the catheter piece comprises an outer tube and an inner tube, and the inner tube is arranged in an inner cavity of the outer tube in a penetrating way; the balloon is arranged on the inner tube in a surrounding manner, is connected with the distal end of the outer tube, is communicated with the inner cavity of the outer tube and is used for dilating blood vessels; the cutting assembly comprises a driving assembly and a plurality of cutting knives, the plurality of cutting knives are arranged in an array manner, and the driving assembly is used for driving the cutting knives to stretch out and draw back. The balloon is conveyed to a narrow lesion, the balloon is inflated to expand a blood vessel, after the blood vessel is expanded, the balloon is deflated, the cutting balloon expanding catheter is pushed continuously, the outer tube is conveyed to the lesion, the cutting assembly is aligned to the lesion to be cut, and the cutting knife is driven to extend out of the lesion of the blood vessel through controlling the driving assembly. The blood vessel is expanded in advance through the saccule, and then the cutting assembly is conveyed to the lesion, so that the capability of passing through the tortuous blood vessel is improved, and the damage risk of the cutting assembly to the normal blood vessel is reduced.

Description

Cutting balloon dilation catheter

Technical Field

The application relates to the technical field of medical instruments, in particular to a cutting balloon dilation catheter.

Background

Vascular intervention is an important treatment mode for carrying out vascular stenosis blood circulation reconstruction treatment. In vascular interventions, balloon catheters are often used as the main vascular interventional instrument. For some intravascular stenotic lesions, such as calcification, plaque or fibrosis, the traditional balloon catheter cannot effectively dilate the stenotic lesion, and has poor passing ability when treating the stenotic lesion, and is generally subjected to pretreatment by other instruments. To address this problem, some medical device companies have developed special balloon types such as cuts, scores, and the like.

However, the existing cutting balloon has a larger diameter after being folded due to the existence of the blade and the blade base and the special folding mode, so that the cutting balloon has poorer passing capability when treating the narrow lesions and is generally required to be pretreated by other instruments; meanwhile, the blade is made of stainless steel, is fixed on the balloon and has high overall hardness.

Content of the application

Because the traditional balloon catheter cannot effectively dilate a stenotic lesion, the traditional balloon catheter has poor passing ability when treating the stenotic lesion and is generally required to be pretreated by other instruments. Based on this, it is necessary to provide a cutting balloon dilation catheter that improves the dilation ability of the cutting balloon dilation catheter against blood vessels and the ability to overstretch in stenotic lesions, while having safe cutting ability, reducing the risk of injury to normal blood vessels during surgery.

The specific technical scheme is as follows:

in one aspect, the present application relates to a cutting balloon dilation catheter comprising a catheter member, a balloon, and a cutting assembly, the catheter member comprising an outer tube and an inner tube, the inner tube passing through a lumen of the outer tube; the balloon is arranged on the inner tube in a surrounding manner, is connected with the distal end of the outer tube, is communicated with the inner cavity of the outer tube and is used for dilating a blood vessel; the cutting assembly comprises a driving assembly and a plurality of cutting knives, wherein the driving assembly and the plurality of cutting knives are arranged on the outer tube, the plurality of cutting knives are arranged in an array mode, and the driving assembly is used for driving the cutting knives to stretch out and draw back.

When the cutting balloon dilation catheter is used, the balloon is conveyed to the narrow lesion, gas or liquid is conveyed into the balloon through the inner cavity of the outer tube, so that the balloon is filled to dilate a blood vessel, after the blood vessel is dilated, the gas or liquid in the balloon is pumped out, the balloon is deflated, the cutting balloon dilation catheter is pushed continuously, the outer tube is conveyed to the lesion, the cutting assembly is aligned to the lesion to be cut, and the cutting knife is driven to extend out of the lesion of the blood vessel through controlling the driving assembly. Through setting up the sacculus at the front end of cutting sacculus inflation pipe, aerify and deflate, can expand the blood vessel in advance, after the vasodilatation is accomplished, carry the cutting assembly to pathological change department again, improve the ability through tortuous blood vessel, and reduce the damage risk of cutting assembly to normal blood vessel. In addition, the manner in which the cutting blade is attached to the outer tube has a smaller overall volume in the folded or collapsed condition of the balloon and greater ability to pass through the stenotic lesion than in the prior art where the cutting blade is attached directly to the outer circumference of the balloon.

The technical scheme is further described as follows:

in one embodiment, the drive assembly includes a helical coil and an elastic member;

when the spiral coil is electrified, the cutting knife is sucked, so that the elastic piece is in a compressed state;

when the spiral coil is powered off, the cutting knife is loosened, and the elastic piece drives the cutting knife to extend outwards along the radial direction of the outer tube.

Through setting up helical coil cooperation elastic component, produce the electromagnetic field when helical coil circular telegram, can hold the cutting knife, the elastic component has elastic potential energy, and when cutting sacculus expansion pipe transported this moment, the cutting assembly is in the state of retracting, avoids the damage of cutting knife to normal blood vessel. When the cutting assembly is transported to the lesion site, the spiral coil is de-energized, the electromagnetic field is stopped, and the elastic member elastically recovers to drive the cutting blade to pop out to cut the vascular lesion site. After the cutting is completed, the cutting knife can be retracted by electrifying again, so that the subsequent movement of the cutting saccule dilating catheter in the blood vessel is facilitated.

In one embodiment, the cutter comprises a plurality of blades, the plurality of blades are wound on the outer tube to form an annular cutter, and the driving assembly is used for driving the plurality of blades to stretch and retract. This cutting knife is through setting up a plurality of blade of locating the outer tube around for the circumference of outer tube equally distributes the blade, is convenient for to the omnidirectional cutting of vasculopathy department, and overall structure is simple reasonable, and the cutting effect is good.

In one embodiment, the blade has a height of 0.5-5mm and a length of 1-50mm.

In one embodiment, the blade is provided with a blade edge and a blade back, and a plurality of medicine collecting bins which can be filled with medicines are formed on part or all of the blade edge.

In one embodiment, the medicine collecting bin is triangular in shape, and the vertex angle of the triangle is arranged on one side, close to the knife back, of the knife edge.

In one embodiment, each of the blades is formed at opposite ends thereof with guide slopes each extending from an end of the back toward a middle portion of the blade edge.

In one embodiment, the cutting balloon dilation catheter further comprises a bag-shaped membrane, wherein the bag-shaped membrane is of an open-end structure, and an opening of the bag-shaped membrane is connected to the outer tube and covers the blade. The blade is wrapped by the bag-shaped film, so that the damage risk to normal blood vessels in the transfer process is greatly reduced, the safety is improved, and the loss of medicines in the medicine collecting bin in the transfer process can be prevented.

In one embodiment, the bag-shaped film is provided with a plurality of cutting lines, and at least one cutting line is arranged along the direction of the blade. The bag-shaped film can be easily cut through the cutting lines when the driving assembly drives the cutting knife to extend out, and the structure is simple and reasonable.

In one embodiment, the cutting balloon dilation catheter further comprises a catheter hub connected to the proximal ends of the outer tube and the inner tube, the catheter hub comprising a guidewire lumen, a filling lumen and an electrical connector, the guidewire lumen being in communication with the lumen of the inner tube for guiding a guidewire into the lumen of the inner tube, the filling lumen being in communication with the lumen of the outer tube and the balloon for inflation and deflation of the balloon, the electrical connector being in electrical connection with the drive assembly for controlling the drive assembly to be powered on and off. The catheter seat is arranged to facilitate the operation of the cutting balloon dilation catheter positioned in the blood vessel to be controlled outside, and the catheter seat is provided with the guide wire cavity to facilitate the movement of the guide wire in the blood vessel to be controlled outside. Through set up the filling chamber with the inner chamber intercommunication of outer tube on the catheter seat, be convenient for at the inflation and the bleeder of external control sacculus, simple structure is reasonable, and it is convenient to use. Through setting up the electric joint on the catheter seat, be convenient for at external control drive assembly, simple structure is reasonable, and it is convenient to use.

Drawings

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

FIG. 1 is a schematic view of the overall structure of an exemplary cutting balloon dilation catheter;

FIG. 2 is a schematic view showing a partial structure of a cutting balloon dilation catheter according to an embodiment;

FIG. 3 is a schematic diagram of a prior art cutting blade cutting lesions;

FIG. 4 is a schematic view of a cutter cutting a lesion according to an embodiment;

FIG. 5 is a schematic view of an embodiment blade;

FIG. 6 is a schematic view of a bag-like film according to an embodiment;

FIG. 7 is a schematic cross-sectional view of an embodiment cutting assembly retracted;

FIG. 8 is a schematic cross-sectional view of an embodiment of a cutting assembly when extended.

Reference numerals illustrate: 10. cutting the balloon dilation catheter; 100. a conduit member; 110. an outer tube; 120. an inner tube; 122. a tip outlet; 200. a balloon; 300. a cutting assembly; 310. a drive assembly; 312. a spiral coil; 314. an elastic member; 320. a cutting knife; 322. a blade; 3222. a blade; 3224. a knife back; 3226. a medicine collecting bin; 3228. a guide slope; 400. a bag-like film; 410. cutting lines; 500. a marker ring; 600. a catheter holder; 610. a guidewire lumen; 620. filling the cavity; 630. an electrical connector; 700. a medicament.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

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

The term "proximal" generally refers to the end of the corresponding member that is proximal to the operator and "distal" refers to the end of the corresponding member that is distal to the operator.

Referring to fig. 1 and 2, one embodiment provides a cutting balloon dilation catheter 10 comprising a catheter member 100, a balloon 200, and a cutting assembly 300, the catheter member 100 comprising an outer tube 110 and an inner tube 120, the inner tube 120 being disposed through a lumen of the outer tube 110; the balloon 200 is arranged on the inner tube 120 in a surrounding manner, is connected with the distal end of the outer tube 110, the balloon 200 is communicated with the inner cavity of the outer tube 110, and the balloon 200 is used for dilating a blood vessel; the cutting assembly 300 includes a driving assembly 310 and a plurality of cutting knives 320 disposed on the outer tube 110, the plurality of cutting knives 320 are arranged in an array, and the driving assembly 310 is used for driving the cutting knives 320 to stretch and retract.

When the cutting balloon dilation catheter 10 is used, the balloon 200 is conveyed to a narrow lesion, gas or liquid is conveyed into the balloon 200 through the inner cavity of the outer tube 110, so that the balloon 200 is inflated to dilate a blood vessel, after the blood vessel is dilated, the gas or liquid in the balloon 200 is pumped out, the balloon 200 is deflated, the cutting balloon dilation catheter 10 is pushed continuously, the outer tube 110 is conveyed to the lesion, the cutting assembly 300 is aligned to the lesion to be cut, and the driving assembly 310 is controlled to drive the cutting knife 320 to extend out of the lesion of the blood vessel. Through setting up sacculus 200 at the front end of cutting sacculus inflation pipe 10, aerify and deflate, can expand the blood vessel in advance, after the blood vessel expansion is accomplished, carry cutting assembly 300 again to pathological change department, improve the ability through tortuous blood vessel, and reduce cutting assembly 300 to the damage risk of normal blood vessel. In addition, the manner in which the cutting blade is attached to the outer tube has a smaller overall volume in the folded or collapsed condition of the balloon and greater ability to pass through the stenotic lesion than in the prior art where the cutting blade is attached directly to the outer circumference of the balloon.

Because the cutter 320 is directly disposed on the outer tube 110, the outer diameter of the device is small after the cutter 320 is contracted, and the cutter 320 has a small volume, the device can easily pass through a narrow place and can effectively improve the capability of the cutting balloon dilation catheter 10 provided by the embodiment for passing through tortuous vessels.

Referring to fig. 1 and 2, in some embodiments, the cutting blade 320 is made of a stainless steel material that is magnetically permeable. The drive assembly 310 includes a helical coil 312 and an elastic member 314; when the spiral coil 312 is electrified, the cutter 320 is sucked, so that the elastic piece 314 is in a compressed state; when the spiral coil 312 is powered off, the cutter 320 is released, and the elastic member 314 drives the cutter 320 to extend. By arranging the spiral coil 312 and matching with the elastic piece 314, an electromagnetic field is generated when the spiral coil 312 is electrified, the cutting knife 320 can be sucked, the elastic piece 314 has elastic potential energy, and at the moment, when the cutting balloon dilation catheter 10 is transported, the cutting assembly 300 is in a retracted state, so that the damage of the cutting knife 320 to a normal blood vessel is avoided. When the cutting assembly 300 is transported to the lesion, the helical coil 312 is de-energized, the electromagnetic field is stopped, and the elastic member 314 elastically resumes to drive the cutting blade 320 to eject outwardly, cutting the vascular lesion. After the cut is completed, the cutting blade 320 may be again energized to retract, facilitating subsequent movement of the cutting balloon dilation catheter 10 within the vessel.

Specifically, the helical coil 312 is disposed on the outer wall of the outer tube 110 to facilitate driving the cutter 320. The elastic member 314 is a spring.

Referring to fig. 1 and 2, in some embodiments, the cutter 320 includes a plurality of blades 322, the plurality of blades 322 are wound around the outer tube 110 to form a ring cutter 320, and the driving assembly 310 is configured to drive the plurality of blades 322 to retract. This cutting knife 320 is through setting up a plurality of blade 322 of locating outer tube 110 around for the circumference of outer tube 110 equally distributes blade 322, can cut calcification, plaque or the fibrous region of different positions on the pathological change vascular wall, and overall structure is simple reasonable, and the cutting effect is good.

Preferably, the cutter 320 includes four blades 322, the four blades 322 are uniformly distributed along the circumference of the outer tube 110, and the included angle between the centers of the adjacent blades 322 is 90 °. The cutter blades 320 are provided with four groups of cutter blades 320 which are uniformly spaced along the axial direction of the outer tube 110. When the cutting knife 320 stretches out to the vascular lesion, plaque on the vascular lesion can be better attached through the setting of the plurality of groups of cutting knives 320, and the cutting effect is improved.

It is understood that the cutter 320 includes other numbers of blades 322, such as, but not limited to, 2, 3, 5, 6, 7, 8, 9, 10 blades 322.

It is understood that the number of the sets of the cutter 320 may be other, for example, but not limited to, 2 sets, 3 sets, 5 sets, 6 sets, 7 sets, 8 sets, 9 sets, and 10 sets.

Specifically, the plurality of blades 322 are disposed at intervals along the axial direction and the circumferential direction of the outer tube 110 to form an array arrangement, and the plurality of blades 322 may also be disposed at intervals along oblique lines.

In the prior art, the conventional cutting knife is a large blade, and as shown in fig. 3, the conventional cutting knife cannot adaptively change the curvature along with the curved surface of the lesion, so that only a part of the lesion can be cut off, and even if the cutting knife is used for cutting for a plurality of times, the satisfactory effect cannot be achieved. Through setting up a plurality of cutting knives 320 array arrangement setting in this application, as shown in fig. 4, because the angle between a plurality of cutting knives 320 can follow the crooked shape self-adaptation transform of pathological change department, consequently, each cutting knife 320 can attach each crooked position at pathological change department for can laminate more when cutting pathological change, the cutting effect is better, reaches good treatment, and can effectively avoid the excessive cutting to pathological change department, avoid the emergence of complications such as perforation, restenosis, and can be applicable to bigger pathological change angle.

In a preferred embodiment, the material of the cutter 320 in this embodiment is an alloy, however, in other embodiments, the material of the cutter 320 in this embodiment may be a material with high hardness such as pure metal, plastic, or ceramic.

Referring to fig. 5, in some embodiments, the height of the blade 322 in this embodiment ranges from 0.5 mm to 5mm, and the length of the cutter ranges from 1 mm to 50mm.

In a preferred embodiment, the number of blades 322 in this embodiment is determined based on the length of the balloon 200.

In a preferred embodiment, the material of balloon 200 in this embodiment is a semi-compliant or non-compliant material.

In a preferred embodiment, the material of the catheter member 100 in this embodiment is nylon, and in other embodiments, the material of the catheter member 100 in this embodiment may be polyether block polyamide, a multi-layer braided tube, a metal spiral cut tube, or the like.

Referring to fig. 5, in some embodiments, blade 322 is provided with a blade edge 3222 and a blade back 3334, with some or all of blade edge 3222 having a plurality of drug reservoirs 3226 filled with drug 700.

Referring to fig. 5, in some embodiments, the drug-collecting reservoir 3226 is triangular in shape, and the apex angle of the triangle is provided on the side of the blade edge 3222 adjacent to the back 3224.

Referring to fig. 5, in some embodiments, each blade 322 is formed with guide ramps 3228 at opposite ends, each extending from an end of back 3224 toward a middle portion of edge 3222.

Specifically, the drug collecting bin 3226 is arranged on the blade, the blade 322 is exposed along with the expansion of the balloon 200 to contact thrombus or plaque, and the drug collecting bin 3226 has the function of storing the drug 700, so that the drug 700 is released in the cutting process when the blade 322 reaches the thrombus or plaque, the drug 700 can accurately reach the lesion, the purpose of directional drug administration is realized, the drug 700 can be prevented from falling off to the blood vessel in the conveying process of the balloon 200 in a human body, side effects are generated on the human body, the drug 700 can directly reach the lesion, and the use amount of the drug 700 is reduced.

Referring to fig. 6 and 7, in some embodiments, the cutting balloon dilation catheter 10 further comprises a pouch membrane 400, the pouch membrane 400 having an open-ended structure, the opening of the pouch membrane 400 being connected to the outer tube 110 and being covered by the blade 322. By arranging the bag-shaped film 400 to wrap the blade 322, the damage risk to normal blood vessels in the transfer process is greatly reduced, the safety is improved, and the loss of the medicine 700 in the medicine collecting bin 3226 in the transfer process can be prevented.

Referring to fig. 6 and 8, in some embodiments, the pouch film 400 is provided with a plurality of cut lines 410, at least one cut line 410 being disposed along the direction of the blade 322. The cutting line 410 is arranged, so that the bag-shaped film 400 can be easily cut when the driving component 310 drives the cutting knife 320 to extend, and the structure is simple and reasonable.

Specifically, the cutting lines 410 intersect at a midpoint that is suitably disposed above the blade 322. Preferably, the cutting lines 410 are provided with four, and the four cutting lines 410 are disposed to intersect to form a rice shape.

Referring to fig. 1, in some embodiments, the cutting balloon dilation catheter 10 further includes a plurality of marker rings 500, the plurality of marker rings 500 being disposed on either side of the cutting assembly 300 and balloon 200, respectively, the marker rings 500 being used for positioning of the cutting assembly 300 and balloon 200 in a blood vessel. By providing a plurality of marker rings 500, the positions of the cutting assembly 300 and the balloon 200 can be marked under the action of X-rays, so that the position of the cutting blade 320 relative to the lesion can be accurately determined, and the treatment effectiveness and accuracy can be improved.

Referring to fig. 1, in some embodiments, the cutting balloon dilation catheter 10 further comprises a catheter hub 600, the catheter hub 600 being connected to the proximal ends of the outer tube 110 and the inner tube 120, the catheter hub 600 comprising a guidewire lumen 610, an inflation lumen 620, and an electrical connector 630, the guidewire lumen 610 being in communication with the lumen of the inner tube 120 for guiding a guidewire into the lumen of the inner tube 120. The cutting balloon dilation catheter 10 which is positioned in a blood vessel is convenient to work at the outside control by arranging the catheter seat 600, the movement of the guide wire in the blood vessel is convenient to control at the outside by arranging the guide wire cavity 610 on the catheter seat 600, the inflation cavity 620 communicated with the inner cavity of the outer tube 110 is convenient to inflate and deflate at the outside control balloon 200 by arranging the electric connector 630 on the catheter seat 600, and the driving assembly 310 is convenient to control at the outside, and has simple and reasonable structure and convenient use.

Specifically, the present application provides a method of using a cutting balloon dilation catheter 10 comprising the steps of:

the cutting balloon dilation catheter 10 is shown in fig. 1 in its pre-use state, with all blades 322 constrained by a tubular body (not shown), and the spring in its compressed state;

after preparation before operation, the electric connector 630 is connected with the electromagnetic controller, and is electrified, the spiral coil 312 generates an electromagnetic field to suck the blade 322, the tip of the cutting balloon dilation catheter 10 is penetrated into a guide wire, and the guide wire penetrates out along the lumen of the inner tube 120 and penetrates out of the guide wire cavity 610 of the catheter seat 600;

referring to fig. 1, it is determined whether the balloon 200 reaches the lesion site by the marker ring 500 on the inner tube 120;

after reaching the designated position, balloon 200 is inflated or liquid is inflated through inflation lumen 620, the inflated balloon 200 can expand the diameter of the vascular lesion, deflation and re-inflation are repeated several times to expand the diameter of the blood vessel, and then deflation and pushing the cutting balloon inflation catheter 10 to place the blade 322 at the lesion;

then, when the power is turned off, the magnetic field is removed, and the blade 322 moves toward the wall of the blood vessel due to the fact that the blade 322 is not subjected to the magnetic field and is subjected to the elastic force of the elastic member 314, and at this time, the blade 322 cuts the bag-shaped membrane 400 and cuts into the lesion of the blood vessel, referring to fig. 2;

then, when the power is applied and the magnetic field is generated, the blade 322 is compressed by the magnetic field, the elastic member 314 moves toward the center of the guide tube, and the blade 322 is tightly attached to the outer tube 110; then powering off, repeating the powering on and powering off steps, and cutting the lesion for a plurality of times;

after the cutting is completed, the current is applied, the magnetic field is generated, the blade 322 is compressed by the magnetic field, the elastic member 314 can be compressed by the guiding catheter, the blade 322 can be prevented from contacting the blood vessel, and then the cutting balloon dilation catheter 10 is withdrawn, so that the operation is completed.

Specifically, the present application also provides another method of using a cutting balloon dilation catheter 10 for a drug 700 carried by a blade 322, comprising the steps of:

the cutting balloon dilation catheter 10 body is shown in fig. 1 in its pre-use condition, all blades 322 being constrained by a tubular body (not shown), the resilient member 314 being in a compressed state;

then, the power is cut off, the magnetic field disappears, the blade 322 moves towards the blood vessel wall because the blade 322 is not subjected to the magnetic field and is subjected to the elasticity of the elastic piece 314, at the moment, the blade 322 cuts the bag-shaped membrane 400 and cuts into the lesion site of the blood vessel, and meanwhile, the medicine 700 on the medicine collecting bin 3226 is released to the lesion site to play a therapeutic role, and referring to fig. 2;

then, when the power is applied and a magnetic field is generated, the blade 322 is compressed due to the magnetic field, the elastic piece 314 is compressed, the blade 322 moves towards the center of the catheter, and the blade 322 is tightly attached to the catheter; then cutting off the power, repeating the steps, and cutting the lesion for a plurality of times;

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. A cutting balloon dilation catheter comprising:

a catheter member (100), wherein the catheter member (100) comprises an outer tube (110) and an inner tube (120), and the inner tube (120) is arranged in an inner cavity of the outer tube (110) in a penetrating manner;

the balloon (200) is arranged on the inner tube (120) in a surrounding mode and is connected with the distal end of the outer tube (110), the balloon (200) is communicated with the inner cavity of the outer tube (110), and the balloon (200) is used for dilating blood vessels; and

the cutting assembly (300) comprises a driving assembly (310) and a plurality of cutting knives (320) which are arranged on the outer tube (110), the plurality of cutting knives (320) are arranged in an array manner, and the driving assembly (310) is used for driving the cutting knives (320) to stretch out and draw back;

the drive assembly (310) includes a helical coil (312) and an elastic member (314);

-said helical coil (312), when energized, attracts said cutter (320) to place said elastic member (314) in compression;

when the spiral coil (312) is powered off, the cutter (320) is loosened, and the elastic piece (314) drives the cutter (320) to extend outwards along the radial direction of the outer tube (110).

2. The cutting balloon dilation catheter of claim 1 wherein the cutting blade (320) comprises a plurality of blades (322), the plurality of blades (322) being wound around the outer tube (110) to form a ring-shaped cutting blade (320), the drive assembly (310) being configured to drive the plurality of blades (322) to telescope.

3. The cutting balloon dilation catheter of claim 1 wherein the blade (322) has a height of 0.5-5mm and the blade (322) has a length of 1-50mm.

4. The cutting balloon dilation catheter of claim 2 wherein the blade (322) has a blade edge and a blade back, some or all of the blade edge having drug-collecting reservoirs (3226) open to be filled with drugs (700).

5. The cutting balloon dilation catheter of claim 4 wherein the drug-collecting cartridge is triangular in shape and a vertex of the triangle is disposed on a side of the blade adjacent the back of the knife.

6. The cutting balloon dilation catheter of claim 4 wherein each of the blades (322) is formed with a guide ramp at opposite ends, the guide ramps each extending from an end of the blade back toward a middle portion of the blade edge.

7. The cutting balloon dilation catheter of claim 4 further comprising a bag-like membrane (400), the bag-like membrane (400) being of open-ended configuration, an opening of the bag-like membrane (400) being connected to the outer tube (110) and being covered outside the blade (322).

8. The cutting balloon dilation catheter according to claim 7 wherein the bag-like membrane (400) is provided with a plurality of cut lines (410), at least one of the cut lines (410) being arranged in the direction of the blade (322).

9. The cutting balloon dilation catheter according to any one of claims 1-8 further comprising a catheter hub (600), the catheter hub (600) being connected to proximal ends of the outer tube (110) and the inner tube (120), the catheter hub (600) comprising a guidewire lumen (610), an inflation lumen (620) and an electrical connector (630), the guidewire lumen (610) being in communication with the inner lumen of the inner tube (120) for guiding a guidewire into the inner lumen of the inner tube (120), the inflation lumen (620) being in communication with the inner lumen of the outer tube (110) and the balloon (200) for inflation and deflation of the balloon (200), the electrical connector (630) being in electrical connection with the drive assembly (310) for controlling the drive assembly (310) to be powered off.