A cutting balloon dilatation catheter

Abstract

The invention discloses a cutting balloon dilatation catheter, which relates to the technical field of medical devices and comprises a balloon and a metal grid, wherein the metal grid comprises at least two wave segments, each wave segment forms a circular ring, and different wave segments are connected by straight segments; the invention also comprises a cutting assembly, which is embedded in the metal grid and adapted to the shape of the metal grid. A developing material is sprayed on the metal grid, so that the working position of the metal grid can be monitored at any time, or a developing material is also welded at the welding position of the metal grid and the cutting assembly for positioning observation. The metal grid formed by the wave segments and the straight segments itself has good retraction properties, so that the retraction is no longer dependent on the retraction of the balloon, and the retraction property improves the passability. The cutting assembly can be separately processed by being embedded in the metal grid, so that the processing difficulty is reduced and the replaceability is increased.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a cutting balloon dilatation catheter. Background Art

[0002] Percutaneous transluminal angioplasty refers to percutaneous puncture of blood vessels, inserting a balloon dilatation catheter through a guide catheter, dilating the diseased blood vessels and improving blood flow in the narrowed parts of the blood vessels. In some calcified or fibrotic vascular lesions, it is difficult for ordinary balloon dilatation catheters to dilate the lesions until blood flow is restored. Clinically, cutting balloons are usually used to dilate such lesions. The cutting blades or cutting wires installed on the surface of the balloons are used to cut the blood vessel walls to improve blood flow.

[0003] However, the cutting balloons currently used in the market have poor retraction (retraction refers to the ability of the balloon to conform to and fit the wall of the blood vessel or narrow channel when expanding). Especially in angioplasty, because good retraction can ensure that the balloon can evenly and appropriately expand the narrow area, while minimizing damage to the blood vessel wall or over-expansion, after the cutting balloon is depressurized, if the retraction is poor, it is easy to cause damage to the blood vessel wall, especially the cutting balloon with a blade, which has a greater risk of damage, and the cutting balloon has poor permeability (permeability refers to the ability of the balloon catheter to pass through narrow or twisted blood vessels) and is not easy to reach the calcified lesions of tortuous blood vessels. At present, there is a clinical need for a cutting balloon with excellent retraction and the ability to smoothly reach the location of tortuous calcified lesions to solve the expansion of calcified lesions in tortuous blood vessels, while avoiding damage to the blood vessels by the cutting blades. Summary of the invention

[0004] In order to solve the problem of poor reentry, the present invention discloses a cutting balloon dilatation catheter, comprising a balloon, and further comprising:

[0005] A metal grid is wrapped around the outside of the balloon, and the metal grid includes at least two wave segments, each wave segment forms a closed loop, and adjacent wave segments are connected by straight segments.

[0006] The cutting component is embedded in the metal grid and adapted to the shape of the metal grid.

[0007] Furthermore, the wave section includes short rod one and short rod two, and short rod one and short rod two form a V shape. The straight section includes a long rod, and both ends of the straight section are connected to short rod one and short rod two in adjacent wave sections. Short grooves are opened on the outside of short rod one and short rod two, and a long groove is opened on the outside of the long rod, and the cutting assembly is embedded in the short groove and the long groove.

[0008] Furthermore, the cutting assembly includes a short knife 1, a long knife and a short knife 2, and the two ends of the long knife are V-shaped grooves. The short knife 1 and the short knife 2 are fixedly installed in the V-shaped groove of the long knife, so that the cutting edge at the top remains continuous. Through the above technical solution, the metal grid surrounded by the wavy segment and the straight segment itself has good retraction, so that the retraction is no longer dependent on the retraction of the balloon. The better retraction improves the passability. The cutting assembly can be embedded in the metal grid and processed separately, which reduces the difficulty of processing and increases the replaceability; the short groove and the long groove can make the fixation between the cutting assembly and the metal grid more stable, and the V-shaped grooves are set at both ends of the long knife, so that the entire cutting assembly can cut a triangular opening, which greatly improves the cutting effect.

[0009] Furthermore, the wave section includes a short rod one and a short rod two, short grooves are provided on the inner sides of the short rod one and the short rod two, a short through groove is provided on the short groove, the width of the short through groove is smaller than the width of the short groove, and a step is formed on the bottom surface of the short groove; the straight section includes a long rod, the two ends of the long rod are connected to the short rod one and the short rod two of the adjacent wave sections, a long groove is provided on the inner side of the long rod, a long through groove is provided in the long groove, the width of the long through groove is smaller than the width of the long groove, and a step is formed on the bottom surface of the long groove; the lower end of the cutting component is stuck in the long groove and the short groove, and the upper end of the cutting component is exposed outside the metal grid.

[0010] Furthermore, the cutting assembly includes a short knife 1, a long knife and a short knife 2, the two ends of the long knife are V-shaped grooves, and the short knife 1 and the short knife 2 are fixedly installed in the V-shaped groove of the long knife, so that the cutting edge at the top remains continuous; the lower ends of the short knife 1, the long knife and the short knife 2 are fixedly installed with a base, the width of the base is greater than the width of the short knife 1, the long knife and the short knife 2, the base is stuck in the long groove and the short groove, and the short knife 1, the long knife and the short knife 2 are exposed to the outside of the metal grid. Through the above technical solution, the cutting assembly is installed on the inner side of the metal grid, and passes through the short through groove and the long through groove from the inside to the outside of the metal grid, which can ensure that the embedded cutting assembly is not easy to fall off during use, and even if the connection is loose, it can be maintained through the pressure between the balloon and the metal grid, thereby improving the safety of use.

[0011] Furthermore, an elastic long rod is fixedly mounted on the base, the elastic long rod is located on the base below the long knife, the upper part of the elastic long rod is fixedly connected to the step at the bottom of the long groove, when the balloon is not expanded, the elastic long rod is in a natural state, the short knife 1, the long knife, and the short knife 2 are all located inside the metal mesh frame and are not exposed. Through the above technical solution, the elastic long rod connects the cutting assembly and the metal mesh frame, when the balloon is not expanded, the entire cutting assembly is located inside the metal mesh frame, so it will not cause unnecessary damage to the blood vessel when moving, and when the balloon is expanded, the elastic long rod is first compressed to push out the cutting assembly for cutting, which plays a good protective role.

[0012] Furthermore, the wave section includes short rod one and short rod two, and short rod one and short rod two form a V shape. The straight section includes a long rod, and the two ends of the straight section are connected to the short rod one and short rod two of the adjacent wave section. Short through grooves are provided on short rod one and short rod two, and a long through groove is provided on the long rod. The cutting assembly includes short knife one, long knife and short knife two, and the two ends of the long knife are V-shaped grooves. Short knife one and short knife two are fixedly installed in the V-shaped groove of the long knife so that the cutting edge at the top remains continuous; short knife one, long knife and short knife two are installed in the short through groove and the long through groove.

[0013] Furthermore, an elastic short rod 1 is fixedly mounted on one end of the short knife, and an elastic short rod 2 is fixedly mounted on the second end of the short knife. The elastic short rod 1 and the elastic short rod 2 are tilted from close to the balloon to away from the balloon. The short knife 1 and the short knife 2 are located near one end of the balloon, and the end of the elastic short rod 1 away from the balloon is connected to an end of the short rod, and the end of the elastic short rod 2 away from the balloon is connected to the second end of the short rod, and they are not exposed in the metal grid in a natural state.

[0014] Furthermore, the width of the long through-groove is greater than that of the long blade, and the width of the short through-groove is greater than that of the short blade 1 and the short blade 2. The long blade is in a multi-section curved shape. When the balloon is expanded, the two ends of the long blade are squeezed toward the middle, and the degree of curvature of the long blade increases. Through the above technical solution, elastic parts are designed at both ends of the cutting assembly for connection so that the middle part can be retracted into the metal grid without damaging the blood vessel when the balloon is not expanded. At the same time, the two ends will be squeezed toward the middle. The curved shape of the long blade can make the curvature more obvious, so that the cutting is more intensive, which can achieve both protection and improve the cutting effect.

[0015] Furthermore, the developing material is sprayed on the metal grid.

[0016] Further, developing materials are installed on the metal grid and the cutting assembly.

[0017] Furthermore, the wave section includes a short rod 1 and a short rod 2, the short rod 1 and the short rod 2 form a V shape, and a plurality of inclined knives 2 are inlaid on the short rod 1 and the short rod 2.

[0018] Furthermore, the straight section comprises a long rod; a plurality of inclined knives are inlaid on the long rod.

[0019] The beneficial effects of the present invention compared with the prior art are:

[0020] (1) Through the technical solution of the present invention, the metal grid surrounded by the wavy segments and the straight segments has good retraction properties, so that the retraction is no longer dependent on the retraction of the balloon. The better retraction properties improve the passability. The cutting components can be embedded in the metal grid and can be processed separately, which reduces the processing difficulty and increases the replaceability. The short grooves and the long grooves can make the fixation between the cutting component and the metal grid more stable. The V-grooves are set at both ends of the long knife, so that the entire cutting component can cut a triangular opening, which greatly improves the cutting effect.

[0021] (2) Through the technical solution of the present invention, the cutting assembly is installed on the inner side of the metal grid, and passes through the short through-groove and the long through-groove from the inner side to the outer side of the metal grid. This can ensure that the embedded cutting assembly is not easy to fall off during use. Even if the connection is loose, the pressure between the balloon and the metal grid can maintain the connection, thereby improving the safety of use.

[0022] (3) Through the technical solution of the present invention, the elastic long rod connects the cutting assembly and the metal grid. When the balloon is not expanded, the entire cutting assembly is located on the inner side of the metal grid, so it will not cause unnecessary damage to the blood vessels when moving. When the balloon is expanded, the elastic long rod is first compressed to push out the cutting assembly for cutting, which plays a good protective role.

[0023] (4) Through the technical solution of the present invention, elastic parts are designed at both ends of the cutting assembly for connection so that the middle part can be retracted into the metal grid when the balloon is not expanded without damaging the blood vessels. At the same time, the two ends will be squeezed toward the middle. The long knife is curved to make the curve more obvious, so that the cutting is more intensive, which not only plays a protective role but also improves the cutting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the cooperation between the metal grid and the balloon of the present invention.

[0025] Figure 2 This is an expanded view of the metal grid of Example 1 of the present invention.

[0026] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0027] Figure 4 This is an expanded view of the metal grid of the second embodiment of the present invention.

[0028] Figure 5 This is an exploded view of the metal grid according to the second embodiment of the present invention.

[0029] Figure 6 for Figure 5 Enlarged view of point B in the middle.

[0030] Figure 7 It is a cross-sectional exploded view of the straight section and the cutting assembly in the second embodiment of the present invention.

[0031] Figure 8 This is an expanded view of the metal grid of Example 3 of the present invention.

[0032] Fig. 9 for Figure 8 Enlarged view of point C in the middle.

[0033] Fig.10This is a schematic diagram of the position of the elastic long rod in Example 3 of the present invention.

[0034] Fig.11 It is a cross-sectional exploded view of the straight section and the cutting assembly in the third embodiment of the present invention.

[0035] Fig.12 This is a partial exploded view of the metal grid of Example 4 of the present invention.

[0036] Fig.13 This is a schematic diagram of a cutting assembly according to a fourth embodiment of the present invention.

[0037] Fig.14 This is an expanded view of the metal grid of Example 5 of the present invention.

[0038] Figure numbers: 1-wave section; 2-straight section; 3-cutting assembly; 4-balloon; 101-short rod one; 102-short groove; 103-short through groove; 104-short rod two; 201-long rod; 202-long groove; 203-long through groove; 301-short knife one; 302-long knife; 303-short knife two; 304-base; 305-elastic long rod; 306-elastic short rod one; 307-elastic short rod two; 308-inclined knife one; 309-inclined knife two. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0040] Embodiment 1: Figure 1-Figure 3A cutting balloon dilatation catheter shown includes a balloon 4, the outer side of the balloon 4 is wrapped with a metal grid, and the metal grid is made of elastic metal, such as nickel-titanium alloy, stainless steel or cobalt-chromium alloy with shape memory effect; nickel-titanium alloy is used in this embodiment, and the metal grid includes at least two wave segments 1, each wave segment 1 forms a closed circular ring, and adjacent wave segments 1 are connected by straight segments 2. In this embodiment, three straight segments 2 are connected between two wave segments 1. The wave segment 1 can be M-shaped, W-shaped, N-shaped, V-shaped and other shapes. Whether it is an angle or an arc bend, it falls within the protection scope of this case. For the convenience of display, three V-shapes are used in this embodiment. The straight section 2 can also be set at multiple positions. The straight section 2 can be fixed between two wave crests between two wave sections 1, or between two wave troughs, or between wave crests and wave troughs. In this embodiment, the straight section 2 is fixed between wave crests and wave crests; the side of the metal grid close to the axis is the inner side, and the side away from the axis is the outer side. The metal grid is sprayed with developing material, and the working position of the metal grid can be monitored at any time. In other embodiments, the developing material is installed on the welding of the metal grid and the cutting assembly 3 for positioning and observation.

[0041] In the present embodiment, a cutting assembly 3 is installed on the metal grid, and the cutting assembly 3 is embedded in the metal grid. The embedding is performed by welding in the present embodiment, and gluing can be used in other embodiments, and it is adapted to the shape of the metal grid; the wave section 1 includes a short rod 101 and a short rod 104, and the short rod 101 and the short rod 104 form a V shape, and the straight section 2 includes a long rod 201, and a short groove 102 is provided on the outer side of the short rod 101 and the short rod 104, and a long groove 202 is provided on the outer side of the long rod 201, and the cutting assembly 3 is embedded in the short groove 102 and the long groove 202.

[0042] In this embodiment, the cutting assembly 3 includes a short knife 1 301, a long knife 302 and a short knife 2 303. Both ends of the long knife 302 are V-shaped grooves. The short knife 1 301 and the short knife 2 303 are fixedly installed in the V-shaped groove of the long knife 302, so that the cutting edge at the top remains continuous. The size of the short knife 1 301 and the size of the short knife 2 303 are adapted to the size of the short groove 102. The bottoms of the short knife 1 301 and the short knife 2 303 are placed in the short groove 102 and then welded. The long knife 302 and the long groove 202 are connected in the same way. The blade of the long knife 302 is located in the middle of the top, and the blades of the short knife 1 301 and the short knife 2 303 are located on one side of the top. In this way, the three can be connected to form a continuous blade, which can cut a triangle. Mouth (the triangular mouth refers to the opening where three cutting lines converge to one point). In this embodiment, the expansion of the balloon 4 will squeeze the expansion of the wave segment. When not squeezed, it can automatically retract. The metal grid surrounded by the wave segment 1 and the straight segment 2 itself has good retraction properties, so that the retraction no longer depends on the retraction of the balloon 4. The better retraction property improves the passability. The cutting component 3 is embedded in the metal grid, so that the cutting component and the metal grid can be processed separately, reducing the processing difficulty and increasing the replaceability. The short groove 102 and the long groove 202 are set to make the fixation between the cutting component 3 and the metal grid more stable. V-grooves are set at both ends of the long knife 302, so that the entire cutting component 3 can cut a triangular mouth, which greatly improves the cutting effect.

[0043] Embodiment 2: Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 A cutting balloon dilatation catheter shown includes a balloon 4, the outer side of the balloon 4 is wrapped with a metal grid, and the metal grid is made of elastic metal, such as nickel-titanium alloy, stainless steel or cobalt-chromium alloy with shape memory effect; nickel-titanium alloy is used in this embodiment, and the metal grid includes at least two wave segments 1, each wave segment 1 forms a closed circular ring, and adjacent wave segments 1 are connected by straight segments 2. In this embodiment, three straight segments 2 are connected between two wave segments 1. The wave segment 1 can be M-shaped, W-shaped, N-shaped, V-shaped and other shapes. Whether it is an angle or an arc bend, it falls within the protection scope of this case. For the convenience of display, three V-shapes are used in this embodiment. The straight section 2 can also be set at multiple positions. Between two wave sections 1, a straight section 2 can be fixed between two wave crests, or between two wave troughs, or between wave crests and wave troughs. In this embodiment, a straight section 2 is fixed between wave crests and wave crests; the side of the metal grid close to the axis is the inner side, and the side away from the axis is the outer side. The developing material is sprayed on the metal grid, and the working position of the metal grid can be monitored at any time. In other embodiments, the developing material is installed on the metal grid and the cutting assembly 3 for positioning and observation.

[0044] In the present embodiment, a cutting assembly 3 is installed on the metal grid, and the cutting assembly 3 is embedded in the metal grid. In the present embodiment, welding is used for embedding, and in other embodiments, gluing can be used and adapted to the shape of the metal grid; the wave section 1 includes a short rod 101 and a short rod 2 104, and a short groove 102 is provided on the inner side of the short rod 101 and the short rod 2 104, and a short through groove 103 is provided on the short groove 102, and the width of the short through groove 103 is smaller than the width of the short groove 102, and a step is formed at the bottom of the short groove 102; the straight section 2 includes a long rod 201, and a long groove 202 is provided on the inner side of the long rod 201, and a long through groove 203 is provided in the long groove 202, and the width of the long through groove 203 is smaller than the width of the long groove 202, and a step is formed at the bottom of the long groove 202.

[0045] In this embodiment, the cutting assembly 3 includes a short knife 1 301, a long knife 302 and a short knife 2 303. Both ends of the long knife 302 are V-shaped grooves. The short knife 1 301 and the short knife 2 303 are fixedly installed in the V-shaped groove of the long knife 302. The blade of the long knife 302 is located in the middle of the top, and the blades of the short knife 1 301 and the short knife 2 303 are located on one side of the top. In this way, the three can be connected to form a continuous blade and can cut a triangular opening (a triangular opening refers to an opening where three cutting lines converge to one point).

[0046] The lower ends of the short knife 1 301, the long knife 302, and the short knife 2 303 are fixed with a base 304. The width of the base 304 is greater than the width of the short knife 1 301, the long knife 302, and the short knife 2 303, and is adapted to the width of the short groove 102 and the long groove 202. The width of the short knife 1 301 and the short knife 2 303 is just adapted to the width of the short through groove 103, and the long knife 302 is adapted to the width of the long through groove 203. The cutting assembly 3 is installed from the inner side of the metal grid, and the base 304 is stuck on the steps at the bottom of the long groove 202 and the short groove 102 (such as Figure 7 , for the convenience of display, an exploded view is shown here), the short knife 1 301, the long knife 302, and the short knife 2 303 are exposed to the outside of the metal grid and fixed by welding. The cutting assembly 3 is installed on the inner side of the metal grid, and passes through the short through-slot 103 and the long through-slot 203 from the inside to the outside of the metal grid, which can ensure that the embedded cutting assembly 3 is not easy to fall off during use, and even if the connection is loose, it can be maintained by the pressure between the balloon 4 and the metal grid, which improves the safety of use.

[0047] Embodiment 3: During the movement of the balloon 4, the cutting assembly 3 often does not shrink enough to cause damage to the blood vessels, and the effect of improving the retractability is limited. Through the solution of this embodiment, the cutting assembly 3 can be retracted into the metal grid to form protection during the movement. Figure 1 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 As shown, the difference from the second embodiment is that the metal grid and the cutting assembly 3 are not welded at all positions.

[0048] In this embodiment, four elastic long rods 305 are fixedly mounted on the base 304, two on each side. The elastic long rods 305 are located on the base 304 at the lower side of the long knife 302. The upper part of the elastic long rods 305 is fixedly connected to the step at the bottom of the long groove 202. That is, the base 304 slides in the long groove 202, and the long knife 302 slides in the long through groove 203. The elastic long rods 305 are located between the base 304 and the step of the long groove 202, and their function is equivalent to a spring (such as Fig.11 , Fig.11 (For the convenience of display, an explosion diagram is shown) When the balloon 4 is not expanded, the elastic long rod 305 is in a natural state, the short knife 301, the long knife 302, and the short knife 303 are all located in the metal grid and not exposed, and are located close to the balloon 4. The elastic long rod 305 connects the cutting component 3 and the metal grid. The elastic force of the elastic long rod 305 is less than the elastic force of the metal grid. When the balloon 4 is not expanded, the entire cutting component 3 is located on the inner side of the metal grid, so it will not cause unnecessary damage to the blood vessels when moving. When the balloon is expanded, the elastic long rod 305 is first compressed to push out the cutting component 3 for cutting, which plays a good protective role.

[0049] Working principle: In the natural state, the metal grid and the balloon 4 are both in the smallest state. At this time, driven by the elastic long rod 305, the entire cutting assembly 3 is hidden in the metal grid, and the movement process will not damage the blood vessels. When it reaches the top working position, the balloon 4 is inflated, and the elastic long rod 305 is squeezed first. The elastic force of the elastic long rod 305 is less than the elastic force of the metal grid, so the elastic long rod 305 is squeezed first to expose the cutting assembly 3, and then the balloon 4 squeezes the entire metal grid from the inside, and the metal grid is stretched open and starts to work. After the work is completed, the metal grid can shrink and lose the squeezing of the balloon 4. The elastic long rod 305 returns to its original position and hides the cutting assembly 3 again.

[0050] Embodiment 4: During the movement of the balloon 4, the cutting assembly 3 often does not shrink enough to cause damage to the blood vessel, and the effect of improving the retractability is limited. Through the solution of this embodiment, the cutting assembly 3 can be retracted into the metal grid to form protection during the movement. Figure 1 , Fig.12 , Fig.13A cutting balloon dilatation catheter shown includes a balloon 4, the outer side of the balloon 4 is wrapped with a metal grid, and the metal grid is made of elastic metal, such as nickel-titanium alloy, stainless steel or cobalt-chromium alloy with shape memory effect; nickel-titanium alloy is used in this embodiment, and the metal grid includes at least two wave segments 1, each wave segment 1 forms a closed circular ring, and adjacent wave segments 1 are connected by straight segments 2. In this embodiment, three straight segments 2 are connected between two wave segments 1. The wave segment 1 can be M-shaped, W-shaped, N-shaped, V-shaped and other shapes. Whether it is an angle or an arc bend, it falls within the protection scope of this case. For the convenience of display, three V-shapes are used in this embodiment. The straight section 2 can also be set at multiple positions. Between two wave sections 1, a straight section 2 can be fixed between two wave crests, or between two wave troughs, or between wave crests and wave troughs. In this embodiment, a straight section 2 is fixed between wave crests and wave crests; the side of the metal grid close to the axis is the inner side, and the side away from the axis is the outer side. The developing material is sprayed on the metal grid, and the working position of the metal grid can be monitored at any time. In other embodiments, the developing material is installed on the metal grid and the cutting assembly 3 for positioning and observation.

[0051] In the present embodiment, a cutting assembly 3 is installed on the metal grid, and the cutting assembly 3 is embedded in the metal grid. The embedding is performed by welding in the present embodiment, and gluing can be used in other embodiments, and it is adapted to the shape of the metal grid; the wave section 1 includes a short rod 101 and a short rod 104, and the short rod 101 and the short rod 104 form a V shape, and the straight section 2 includes a long rod 201, and the short rod 101 and the short rod 104 are provided with short through grooves 103, and the long rod 201 is provided with a long through groove 203.

[0052] In this embodiment, the cutting assembly 3 includes a short knife 1 301, a long knife 302 and a short knife 2 303. Both ends of the long knife 302 are V-shaped grooves. The short knife 1 301 and the short knife 2 303 are fixedly installed in the V-shaped groove of the long knife 302. The blade of the long knife 302 is located in the middle of the top, and the blades of the short knife 1 301 and the short knife 2 303 are located on one side of the top. In this way, the three can be connected to form a continuous blade and can cut a triangular opening (a triangular opening refers to an opening where three cutting lines converge to one point).

[0053] In this embodiment, an elastic short rod 1 306 is fixedly mounted on the end of the short knife 1 301, and an elastic short rod 2 307 is fixedly mounted on the end of the short knife 2 303. The elastic short rod 1 306 and the elastic short rod 2 307 are tilted from close to the balloon 4 to away from the balloon 4. The short knife 1 301 and the short knife 2 303 are located near one end of the balloon 4. The end of the elastic short rod 1 306 away from the balloon 4 is connected to the end of the short rod 1 101, and the end of the elastic short rod 2 307 away from the balloon 4 is connected to the end of the short rod 2 104, and they are not exposed in the metal grid in a natural state; the width of the long through groove 203 is greater than that of the long knife 302, and the width of the short through groove 103 is greater than that of the short knife 1 301 and the short knife 2 303. The long knife 302 is a multi-section curved shape. When the balloon 4 expands, the two ends of the long knife 302 are squeezed toward the middle and move away from the balloon 4 at the same time, and the degree of curvature of the long knife 302 increases. Elastic parts are designed at both ends of the cutting assembly 3 for connection so that the middle part can be retracted into the metal grid when the balloon 4 is not expanded without damaging the blood vessels. At the same time, the two ends will be squeezed toward the middle. The long knife 302 is curved to make the curve more obvious, so that the cutting is more intensive, which not only plays a protective role, but also can improve the cutting effect.

[0054] Working principle: The balloon 4 is not expanded before use, so the elastic short rod 1 306 and the elastic short rod 2 307 drive the cutting assembly 3 in the metal grid. When it moves to the working position, the balloon 4 expands and first squeezes the elastic short rod 1 306 and the elastic short rod 2 307. The elastic force of the elastic short rod 1 306 and the elastic short rod 2 307 is smaller than that of the metal grid, so the entire cutting assembly 3 is driven to be exposed to the outside of the metal grid. Then the metal grid expands and cuts. During the process, the long knife 302 will be squeezed on both sides. The curved shape of the long knife 302 becomes larger, and curved knife marks can be cut. The cutting density will also be improved. The balloon 4 will return to its original state after contraction.

[0055] Embodiment 5: Figure 1 , Fig.14As shown, a cutting balloon dilatation catheter includes a balloon 4, the outer side of the balloon 4 is wrapped with a metal grid, the metal grid is made of elastic metal, such as nickel-titanium alloy, stainless steel or cobalt-chromium alloy with shape memory effect; nickel-titanium alloy is used in this embodiment, and the metal grid includes at least two wave segments 1, each wave segment 1 forms a closed circular ring, and adjacent wave segments 1 are connected by straight segments 2. In this embodiment, three straight segments 2 are connected between two wave segments 1. The wave segment 1 can be M-shaped, W-shaped, N-shaped, V-shaped and other shapes. Whether it is an angle or an arc bend, it falls within the protection scope of this case. For the convenience of display, three V-shapes are used in this embodiment. The straight section 2 can also be set at multiple positions. The straight section 2 can be fixed between two wave crests between two wave sections 1, or between two wave troughs, or between wave crests and wave troughs. In this embodiment, the straight section 2 is fixed between wave crests and wave crests; the side of the metal grid close to the axis is the inner side, and the side away from the axis is the outer side. The metal grid is sprayed with developing material, and the working position of the metal grid can be monitored at any time. In other embodiments, the developing material is installed on the welding of the metal grid and the cutting assembly 3 for positioning and observation.

[0056] In this embodiment, a cutting assembly 3 is installed on the metal grid, and the cutting assembly 3 is embedded in the metal grid. In this embodiment, welding is used for embedding, and in other embodiments, gluing can be used and adapted to the shape of the metal grid; the wave section 1 includes a short rod 101 and a short rod 104, and the short rod 101 and the short rod 104 form a V shape, and the straight section 2 includes a long rod 201; the cutting assembly 3 includes a plurality of inclined knives 1 308, and the inclined knives 1 308 are embedded in the long rod 201, and a plurality of inclined knives 2 309 are embedded in the short rod 101 and the short rod 2 104, and the inclined knives 1 308 and the long rod 201 can be at any angle; the inclined knives 2 309 and the short rod 1 101, as well as the inclined knives 2 309 and the short rod 2 101 can be at any angle, and incisions in different directions can be cut.

Claims

1. A cutting balloon dilatation catheter, comprising a balloon (4), characterized in that: Also includes: A metal grid, the balloon (4) is wrapped with the metal grid outside, the metal grid comprises at least two wave segments (1), each wave segment (1) forms a closed loop, and adjacent wave segments (1) are connected by straight segments (2); a cutting assembly (3), the cutting assembly (3) is embedded in the metal grid and is adapted to the shape of the metal grid; The wave section (1) comprises a short rod 1 (101) and a short rod 2 (104), the short rod 1 (101) and the short rod 2 (104) forming a V-shape, the straight section (2) comprises a long rod (201), the short rod 1 (101) and the short rod 2 (104) are provided with short grooves (102) on the outside, and the long rod (201) is provided with a long groove (202) on the outside, and the cutting assembly (3) is embedded in the short groove (102) and the long groove (202); The cutting assembly (3) comprises a short knife (301), a long knife (302) and a short knife (303), both ends of the long knife (302) are V-shaped grooves, and the short knife (301) and the short knife (303) are fixedly installed in the V-shaped grooves of the long knife (302) so that the cutting edge at the top remains continuous; The short groove (102) is provided with a short through groove (103), the width of the short through groove (103) is smaller than the width of the short groove (102), and a step is formed on the bottom surface of the short groove (102); the straight section (2) comprises a long rod (201), the inner side of the long rod (201) is provided with a long groove (202), the long through groove (203) is provided in the long groove (202), the width of the long through groove (203) is smaller than the width of the long groove (202), and a step is formed on the bottom surface of the long groove (202); the lower end of the cutting component (3) is stuck on the steps of the long groove (202) and the short groove (102), and the upper end of the cutting component (3) is exposed outside the metal grid; A base (304) is fixedly mounted at the lower ends of the short knife (301), the long knife (302) and the short knife (303); the width of the base (304) is greater than the width of the short knife (301), the long knife (302) and the short knife (303); the base (304) is stuck in the long groove (202) and the short groove (102); the short knife (301), the long knife (302) and the short knife (303) are exposed outside the metal grid; An elastic long rod (305) is fixedly mounted on the base (304). The elastic long rod (305) is located on the base (304) below the long knife (302). The upper portion of the elastic long rod (305) is fixedly connected to a step at the bottom of the long groove (202). When the balloon (4) is not expanded, the elastic long rod (305) is in a natural state, and the short knife (301), the long knife (302), and the short knife (303) are all located in the metal grid and are not exposed.

2. A cutting balloon dilatation catheter according to claim 1, characterized in that: The developing material is sprayed on the metal grid.

3. A cutting balloon dilatation catheter according to claim 1, characterized in that: The developing material is mounted on the metal grid and the cutting assembly (3).

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