A scored balloon dilatation catheter

Abstract

The present invention discloses a scoring balloon dilatation catheter, which belongs to the technical field of interventional treatment instruments, and comprises: a catheter; a balloon connected to the distal end of the catheter and capable of radial expansion relative to the catheter; a scoring mechanism, comprising a connecting rod assembly fixed at one end on the catheter, and a scoring member connected to the other end of the connecting rod assembly; the connecting rod assembly has a folded state of being folded to the outer wall of the balloon and an expanded state of being expanded outward relative to the outer wall of the balloon under the thrust during balloon expansion and the tension during contraction; when the connecting rod assembly is in the expanded state, the scoring member extends outward in the radial direction of the balloon. This scoring balloon dilatation catheter amplifies the moving distance of the scoring member in the radial direction of the catheter, and can achieve scoring of large outer diameter diseased tissue using a balloon with a small expanded outer diameter; the moving distance and scoring depth of the scoring member can also be controlled by controlling the size of the balloon expansion; in addition, the scoring member is subjected to the thrust of the connecting rod assembly, and the scoring force on the diseased tissue is greater.

Description

Technical Field

[0001] The invention relates to the technical field of interventional treatment instruments, and in particular to a scored balloon dilatation catheter. Background Art

[0002] Balloon dilatation catheters play an important role in the treatment of vascular diseases. Balloon dilatation catheters expand the distal balloon, squeeze the plaque in the blood vessel, stretch the blood vessel wall, and achieve the purpose of reducing vascular stenosis; but they may also be accompanied by complications such as tearing of the vascular endothelium and elastic retraction of the blood vessel. For hard stenotic lesions (such as calcified lesions), it is usually necessary to increase the filling pressure of the balloon to reduce the degree of stenosis and obtain sufficient lumen volume. The increase in filling pressure will increase the stretching effect of the blood vessel wall, resulting in a greater possibility of complications related to vascular injury (such as severe dissection and rebound). For particularly stubborn and hard lesions, the balloon may be filled to close to the bursting pressure, but the plaque still cannot be compressed.

[0003] Cutting Balloon is a special type of balloon that combines micro-cutting technology with balloon expansion. Compared with conventional balloons, cutting balloons have the following advantages: 1. The micro-blades installed on the surface of the balloon can cut the intima with obvious hyperplasia or calcification, and effectively expand hard and narrow fistula blood vessels; 2. Compared with the blunt and disordered expansion of conventional balloons, the cutting balloon can expand evenly and fully at a lower pressure, with less irregular tearing of the vascular intima, thus less damage to the blood vessels, relatively mild inflammatory response, and can also reduce the probability of restenosis of fistula blood vessels.

[0004] The scoring member of the existing scored balloon is usually installed on the surface of the balloon. After the balloon is expanded, the moving distance of the scoring member along the radial direction of the catheter is usually equal to the expanded outer diameter of the balloon. Since the passability of the scored balloon catheter in the blood vessel needs to be considered, the expanded outer diameter of the balloon cannot be designed to be larger. Therefore, the moving distance of the scoring member is small, and the scoring effect of the scoring member on the diseased tissue is poor. Summary of the invention

[0005] In view of this, the present invention provides a scoring balloon dilatation catheter to solve the problems of the existing scoring balloon dilatation catheter having a short moving distance of the scoring member and poor scoring effect on the diseased tissue.

[0006] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0007] A scored balloon dilatation catheter, comprising:

[0008] catheter;

[0009] A balloon connected to the distal end of the catheter and capable of expanding in the radial direction of the catheter;

[0010] The scoring mechanism comprises a connecting rod assembly having one end connected to the catheter and a scoring piece connected to the other end of the connecting rod assembly; the connecting rod assembly has an expanded state in which it is expanded outward relative to the outer wall of the balloon and a collapsed state in which it is collapsed on the outer wall of the balloon under the thrust of the balloon expansion and the tension of the balloon contraction; when the connecting rod assembly is in the collapsed state, the scoring piece is collapsed on the outer wall of the balloon; when the connecting rod assembly is in the expanded state, the scoring piece extends outward in the radial direction of the balloon.

[0011] Furthermore, the notching mechanism also includes a transmission member fixedly connected to the outside of the balloon and movably connected to the connecting rod assembly, and the transmission member moves radially along the catheter as the balloon expands; the balloon drives the connecting rod assembly to switch between the folded state and the expanded state through the transmission member.

[0012] Furthermore, the catheter is fixed with a first fixing member and a second fixing member located at both axial ends of the balloon; the connecting rod assembly is a planar cross connecting rod assembly, and the two fixed fulcrums at one end of the connecting rod assembly are respectively fixed on the first fixing member and the second fixing member, and the two sliding fulcrums at the other end of the connecting rod assembly are both slidably connected to the notched member.

[0013] Further, the connecting rod assembly includes a first connecting rod, a second connecting rod and a third connecting rod, the first connecting rod and the second connecting rod are cross-arranged, and the notched member is fixed on the third connecting rod; one end of the first connecting rod is connected to the first fixing member, one end of the second connecting rod is connected to the second fixing member, and the other end of the first connecting rod and the other end of the second connecting rod are both slidably connected to the third connecting rod.

[0014] Furthermore, one end of the transmission member is slidably connected to the first connecting rod, and the other end of the transmission member is slidably connected to the second connecting rod.

[0015] Furthermore, the transmission member is a transmission rod extending along the length direction of the balloon.

[0016] Further, the transmission member is provided with a first slide groove, the first connecting rod is connected with a first pin, the second connecting rod is connected with a second pin, and the first pin and the second pin are both slidably connected to the first slide groove;

[0017] A portion of the first connecting rod close to the third connecting rod is provided with a second sliding groove extending along the length direction of the first connecting rod, a portion of the second connecting rod close to the third connecting rod is provided with a third sliding groove extending along the length direction of the second connecting rod, and the first connecting rod and the second connecting rod are cross-slidably connected by a third pin passing through the second sliding groove and the third sliding groove;

[0018] The third connecting rod is provided with a fourth sliding groove, the first connecting rod is connected with a fourth pin, the second connecting rod is connected with a fifth pin, and the fourth pin and the fifth pin are both slidably connected to the fourth sliding groove.

[0019] Further, a portion of the first connecting rod close to the first fixing member is provided with a fifth sliding groove extending along the length direction of the first connecting rod, the fifth sliding groove and the second sliding groove are not connected on the first connecting rod, and the first pin is slidably connected to the fifth sliding groove; a portion of the second connecting rod close to the second fixing member is provided with a sixth sliding groove extending along the length direction of the second connecting rod, the sixth sliding groove and the third sliding groove are not connected on the second connecting rod, and the second pin is slidably connected to the sixth sliding groove.

[0020] Furthermore, the cross section of the notched member is L-shaped.

[0021] Furthermore, the scoring mechanisms are provided in number of three or more at even intervals around the circumference of the balloon.

[0022] The technical solution of the present invention has the following advantages: 1. Since the connecting rod assembly can expand outward relative to the outer wall of the balloon under the action of the balloon, the moving distance of the notching member in the radial direction of the catheter is magnified, so that a balloon with a small outer diameter can be used to notch large outer diameter diseased tissue; 2. The moving distance of the notching member in the radial direction of the catheter can be controlled by controlling the size of the balloon expansion, thereby controlling the depth of the notching of the notching member; 3. The notching member is subjected to the thrust of the connecting rod assembly, and the notching force on the diseased tissue is greater. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the scored balloon dilatation catheter in the embodiment of the present invention when the balloon is in a fully expanded state;

[0025] Figure 2 It is a schematic diagram of the three-dimensional structure of the scored balloon dilatation catheter in the embodiment of the present invention when the balloon is in a contracted state;

[0026] Figure 3 It is a schematic structural diagram of a connecting rod assembly of a notching mechanism in an embodiment of the present invention when it is in an expanded state;

[0027] Figure 4 It is a structural schematic diagram of the connecting rod assembly of the notching mechanism in the embodiment of the present invention when it is in a retracted state;

[0028] Figure 5 It is a schematic diagram of the connection relationship between the balloon, the connecting rod assembly, the notched member and the transmission member when the connecting rod assembly is in the expanded state in the embodiment of the present invention;

[0029] Figure 6 Schematic diagram of the structure of the connecting rod assembly in the embodiment of the present invention when it is in the unfolded state.

[0030] Explanation of the accompanying drawings: 1. catheter; 2. balloon; 3. connecting rod assembly; 31. first connecting rod; 311. second slide groove; 312. fifth slide groove; 32. second connecting rod; 321. third slide groove; 322. sixth slide groove; 33. third connecting rod; 331. fourth slide groove; 34. first pin; 35. second pin; 36. third pin; 37. fourth pin; 38. fifth pin; 4. notching member; 5. transmission member; 51. first slide groove; 6. first fixing member; 7. second fixing member; 8. catheter seat. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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 are within the scope of protection of the present invention.

[0032] In the description of this application, it should be understood that the terms "proximal end" and "distal end" used throughout the text refer to near and far relative to the operator. When the present invention is used, the end close to the doctor or operator is the "proximal end", that is, the end where the operator is located, and the end away from the doctor or operator is the "distal end", that is, the end where the balloon is located. The above-mentioned description of the orientation is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0033] In the description of this application, it should be noted that the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0034] like Figure 1-2A scoring balloon dilatation catheter shown includes a catheter 1, a balloon 2, a scoring mechanism and a catheter seat 8. The balloon 2 and the scoring mechanism are connected to the distal end of the catheter 1, and the catheter seat 8 is connected to the proximal end of the catheter 1; the balloon 2 can expand radially relative to the catheter 1. The scoring mechanism includes a connecting rod assembly 3 and a scoring member 4, one end of the connecting rod assembly 3 is fixed to the distal end of the catheter 1, and the scoring member 4 is connected to the other end of the connecting rod assembly 3. Under the thrust of the balloon 2 during expansion and the tension of the balloon 2 during contraction, the connecting rod assembly 3 has an expanded state in which it is expanded outward relative to the outer wall of the balloon 2 and a collapsed state in which it is collapsed relative to the outer wall of the balloon 2; when the connecting rod assembly 3 is in the collapsed state, the scoring member 4 is collapsed relative to the outer wall of the balloon 2; when the connecting rod assembly 3 is in the expanded state, the scoring member 4 extends radially outward along the balloon 2.

[0035] Specifically, the catheter 1 includes an inner tube and an outer tube, the inner tube passes through the inside of the outer tube, the distal end of the balloon 2 is connected to the inner tube, the proximal end of the balloon 2 is connected to the outer tube, the inner tube runs through the balloon 2, the proximal end of the outer tube is connected to the catheter seat 8, and a filling channel that is connected to the inner cavity of the balloon 2 is formed between the inner tube and the outer tube. The catheter seat 8 is a Y-shaped hollow structure, and a balloon filling joint and a guide wire outlet are provided on the catheter seat 8, and the balloon filling joint is connected to the filling channel. The inner cavity of the inner tube is a guide wire cavity for the guide wire to pass through, and the proximal end of the inner tube is connected to the guide wire outlet.

[0036] In some embodiments, the cross section of the scoring member 4 is L-shaped, and the L-shaped scoring member 4 is conducive to improving the passability of the entire scoring balloon 2. The number of scoring mechanisms is three, and each scoring mechanism includes a connecting rod assembly 3 and a scoring member 4; the three scoring members 4 are evenly distributed in the circumferential direction of the balloon 2. In an alternative embodiment, the number of scoring mechanisms can also be four or more, and the angle between any two adjacent scoring members 4 in the circumferential direction is 360 / n, where n is the number of scoring mechanisms or scoring members 4. The scoring members 4 on multiple scoring mechanisms score the diseased tissue at different angles.

[0037] When the above-mentioned notched balloon dilatation catheter is used, the balloon 2 is transported to the narrow diseased blood vessel through the catheter 1, and gas or liquid is transported into the balloon 2 through the balloon filling joint to expand the balloon 2. As the balloon 2 expands, the connecting rod assembly 3 moves from the retracted state retracted to the outer wall of the balloon 2 to the expanded state retracted relative to the outer wall of the balloon 2. The notched member 4 extends radially outwardly from the balloon 2 as the connecting rod assembly 3 is expanded. At this time, the notched member 4 notches the diseased tissue in the blood vessel under the thrust of the connecting rod assembly 3. After the notching is completed, the balloon 2 is evacuated to make the balloon 2 completely shrink. When the balloon 2 shrinks, it drives the connecting rod assembly 3 to move from the expanded state retracted to the retracted state retracted to the outer wall of the balloon 2. At this time, the notched member 4 is also retracted to the outer wall of the balloon 2, and the notched balloon dilatation catheter can be withdrawn.

[0038] This scoring balloon dilatation catheter, because the connecting rod assembly 3 can be expanded outward relative to the outer wall of the balloon 2 under the action of the balloon 2, compared with the method in the prior art where the scoring member 4 is directly fixed to the outer wall of the balloon 2, the moving distance of the scoring member 4 in the radial direction of the catheter 1 is enlarged, and a balloon 2 with a small expanded outer diameter can be used to achieve the scoring of a large outer diameter diseased tissue. Moreover, by controlling the size of the balloon 2 expansion, the moving distance of the scoring member 4 in the radial direction of the catheter 1 can be controlled, and then the depth of the scoring of the scoring member 4 can be controlled. In addition, the scoring member 4 is subjected to the thrust of the connecting rod assembly 3, and the scoring force on the diseased tissue is greater.

[0039] In some embodiments, Figure 1 and Figure 2 As shown, the catheter 1 is fixed with a first fixing member 6 located at the distal end of the balloon 2 and a second fixing member 7 located at the proximal end of the balloon 2. The first fixing member 6 and the second fixing member 7 are located at the tube leg positions at both ends of the balloon 2. The first fixing member 6 and the second fixing member 7 can be specifically a tubular structure that is sleeved and fixed on the outer periphery of the catheter 1. The connecting rod assembly 3 is a plane cross connecting rod assembly. The two fixed fulcrums at one end of the connecting rod assembly 3 are respectively connected to the first fixing member 6 and the second fixing member 7, and the two sliding fulcrums at the other end of the connecting rod assembly 3 are both slidably connected to the notched member 4. In an alternative embodiment, the positions of the fixed fulcrum and the sliding fulcrum of the connecting rod assembly 3 can be replaced. The two fixed fulcrums at one end of the connecting rod assembly 3 are fixed to the notched member 4, and the two sliding fulcrums at the other end of the connecting rod assembly 3 are respectively slidably connected to the first fixing member 6 and the second fixing member 7. The first fixing member 6 and the second fixing member 7 are correspondingly provided with a sliding groove that facilitates the sliding fulcrum of the connecting rod assembly 3 to slide along the axial direction of the catheter 1.

[0040] In some embodiments, Figure 3 and Figure 4 As shown, the connecting rod assembly 3 includes a first connecting rod 31, a second connecting rod 32 and a third connecting rod 33, the first connecting rod 31 and the second connecting rod 32 are cross-arranged, the notched member 4 is fixed on the third connecting rod 33, and the length direction of the third connecting rod 33, the length direction of the notched member 4 and the axial direction of the balloon 2 are all arranged in the same direction. The first connecting rod 31, the second connecting rod 32 and the third connecting rod 33 are all hard rod bodies. One end of the first connecting rod 31 is connected to the first fixing member 6, one end of the second connecting rod 32 is connected to the second fixing member 7, and the other end of the first connecting rod 31 and the other end of the second connecting rod 32 are both slidably connected to the third connecting rod 33. During the expansion process of the balloon 2, the balloon 2 can drive the first connecting rod 31 and the second connecting rod 32 to rotate outward, and the notched member 4 moves outward along the radial direction of the balloon 2 with the third connecting rod 33.

[0041] In some embodiments, Figure 5 and Figure 6As shown, the notching mechanism also includes a transmission member 5 fixedly connected to the outside of the balloon 2 and movably connected to the connecting rod assembly 3, one end of the transmission member 5 is slidably connected to the first connecting rod 31, and the other end of the transmission member 5 is slidably connected to the second connecting rod 32. The transmission member 5 moves along the radial direction of the catheter 1 as the balloon 2 expands, and the balloon 2 drives the connecting rod assembly 3 to switch between the retracted state and the expanded state through the transmission member 5. Specifically, the transmission member 5 is a transmission rod extending along the length direction of the balloon 2, the transmission rod is a hard rod body, the two ends of the transmission rod are respectively slidably connected to the first connecting rod 31 and the second connecting rod 32, and the transmission rod and the third connecting rod 33 are arranged in parallel. In some alternative embodiments, the transmission member 5 is not limited to a rod-shaped transmission rod. For example, the transmission member 5 includes a sheet-like member with a circular or polygonal middle portion and two connecting rods integrally formed at both ends of the sheet-like member. The two connecting rods are slidably connected to the first connecting rod 31 and the second connecting rod 32 respectively, and the sheet-like member in the middle is fixed to the outer wall of the balloon 2. This transmission member 5 is equivalent to a rod-shaped transmission rod. Since the fixed area between the sheet-like member and the surface of the balloon 2 is larger, the expansion pressure of the balloon 2 can be better transmitted to the connecting rod assembly 3, thereby making the notching member 4 have a greater notching force on the diseased tissue. In other alternative embodiments, the transmission member 5 can also be composed of two relatively independent transmission rods fixed to the outer wall of the balloon 2, one of which is slidably connected to the first connecting rod 31, and the other is slidably connected to the second connecting rod 32.

[0042] In some embodiments, Figure 5 and Figure 6As shown, the transmission member 5 is provided with a first slide groove 51, the first connecting rod 31 is connected with a first pin 34, the second connecting rod 32 is connected with a second pin 35, and the first pin 34 and the second pin 35 are both slidably connected to the first slide groove 51. The portion of the first connecting rod 31 close to the third connecting rod 33 is provided with a second slide groove 311 extending along the length direction of the first connecting rod 31, and the portion of the second connecting rod 32 close to the third connecting rod 33 is provided with a third slide groove 321 extending along the length direction of the second connecting rod 32. The first connecting rod 31 and the second connecting rod 32 are cross-slidably connected by a third pin 36 passing through the second slide groove 311 and the third slide groove 321. The third connecting rod 33 is provided with a fourth slide groove 331 extending along the length direction of the third connecting rod 33, the end of the first connecting rod 31 connected to the third connecting rod 33 is provided with a fourth pin 37, the end of the second connecting rod 32 connected to the third connecting rod 33 is provided with a fifth pin 38, and the fourth pin 37 and the fifth pin 38 are both slidably connected to the fourth slide groove 331. During the expansion process of the balloon 2, the transmission member 5 moves synchronously with the balloon 2, the first pin 34 and the second pin 35 slide along the first slide groove 51, the third pin 36 slides along the second slide groove 311 and the third slide groove 321 at the same time, the fourth pin 37 and the fifth pin 38 slide along the fourth slide groove 331, the angle between the first connecting rod 31 and the second connecting rod 32 and the catheter 1 gradually increases, and the distance between the fourth pin 37 and the fifth pin 38 gradually shortens, thereby pushing the notching member 4 to move away from the balloon 2, thereby increasing the moving distance of the notching member 4 in the radial direction of the catheter 1.

[0043] like Figure 6 As shown, the portion of the first connecting rod 31 close to the first fixing member 6 is provided with a fifth slide groove 312 extending along the length direction of the first connecting rod 31, the fifth slide groove 312 and the second slide groove 311 are not connected on the first connecting rod 31, and the first pin 34 is slidably connected to the fifth slide groove 312; the portion of the second connecting rod 32 close to the second fixing member 7 is provided with a sixth slide groove 322 extending along the length direction of the second connecting rod 32, the sixth slide groove 322 and the third slide groove 321 are not connected on the second connecting rod 32, and the second pin 35 is slidably connected to the sixth slide groove 322. Such a configuration can make the sliding cooperation between the first connecting rod 31 and the second connecting rod 32 and the transmission rod smoother.

[0044] In summary, the scoring balloon dilatation catheter provided by the embodiment of the present invention has a larger moving distance of the scoring member 4 in the radial direction of the catheter 1 than the method in the prior art where the scoring member 4 is directly fixed to the outer wall of the balloon 2, because the connecting rod assembly 3 can be expanded outward relative to the outer wall of the balloon 2 under the action of the balloon 2, and a balloon 2 with a small expanded outer diameter can be used to score large outer diameter diseased tissue. Moreover, the moving distance of the scoring member 4 in the radial direction of the catheter 1 can be controlled by controlling the size of the balloon 2 expansion, thereby controlling the depth of the scoring of the scoring member 4. In addition, the scoring member 4 is subjected to the thrust of the connecting rod assembly 3, and the scoring force on the diseased tissue is greater.

[0045] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A scored balloon dilatation catheter, characterized in that: include: Catheter (1); A balloon (2) connected to the distal end of the catheter (1) and capable of expanding in the radial direction of the catheter (1); The scoring mechanism comprises a connecting rod assembly (3) connected to the catheter (1) at one end, and a scoring member (4) connected to the other end of the connecting rod assembly (3); the connecting rod assembly (3) has an expanded state in which it is expanded outward relative to the outer wall of the balloon (2) and a collapsed state in which it is collapsed to the outer wall of the balloon (2) under the thrust of the balloon (2) when it is expanded and the tension of the balloon (2) when it is collapsed; when the connecting rod assembly (3) is in the collapsed state, the scoring member (4) is collapsed to the outer wall of the balloon (2); when the connecting rod assembly (3) is in the expanded state, the scoring member (4) extends outward along the radial direction of the balloon (2); The notching mechanism further comprises a transmission member (5) fixedly connected to the outside of the balloon (2) and movably connected to the connecting rod assembly (3); the transmission member (5) moves radially along the catheter (1) as the balloon (2) expands; the balloon (2) drives the connecting rod assembly (3) to switch between the folded state and the expanded state via the transmission member (5).

2. The scored balloon dilatation catheter according to claim 1, characterized in that: The catheter (1) is fixed with a first fixing member (6) and a second fixing member (7) located at two axial ends of the balloon (2); the connecting rod assembly (3) is a planar cross connecting rod assembly, and the two fixed fulcrums at one end of the connecting rod assembly (3) are respectively connected to the first fixing member (6) and the second fixing member (7), and the two sliding fulcrums at the other end of the connecting rod assembly (3) are both slidably connected to the notched member (4).

3. The scored balloon dilatation catheter according to claim 2, characterized in that: The connecting rod assembly (3) comprises a first connecting rod (31), a second connecting rod (32) and a third connecting rod (33); the first connecting rod (31) and the second connecting rod (32) are cross-arranged, and the notched member (4) is fixed to the third connecting rod (33); one end of the first connecting rod (31) is connected to the first fixing member (6), one end of the second connecting rod (32) is connected to the second fixing member (7), and the other end of the first connecting rod (31) and the other end of the second connecting rod (32) are both slidably connected to the third connecting rod (33).

4. The scored balloon dilatation catheter according to claim 3, characterized in that: One end of the transmission member (5) is slidably connected to the first connecting rod (31), and the other end of the transmission member (5) is slidably connected to the second connecting rod (32).

5. The scored balloon dilatation catheter according to claim 1, characterized in that: The transmission member (5) is a transmission rod extending along the length direction of the balloon (2).

6. The scored balloon dilatation catheter according to claim 4, characterized in that: The transmission member (5) is provided with a first slide groove (51), the first connecting rod (31) is connected with a first pin (34), the second connecting rod (32) is connected with a second pin (35), and the first pin (34) and the second pin (35) are both slidably connected to the first slide groove (51); A portion of the first connecting rod (31) close to the third connecting rod (33) is provided with a second sliding groove (311) extending along the length direction of the first connecting rod (31), and a portion of the second connecting rod (32) close to the third connecting rod (33) is provided with a third sliding groove (321) extending along the length direction of the second connecting rod (32), and the first connecting rod (31) and the second connecting rod (32) are cross-slidably connected by a third pin (36) passing through the second sliding groove (311) and the third sliding groove (321); The third connecting rod (33) is provided with a fourth sliding groove (331), the first connecting rod (31) is connected with a fourth pin (37), the second connecting rod (32) is connected with a fifth pin (38), and the fourth pin (37) and the fifth pin (38) are both slidably connected to the fourth sliding groove (331).

7. The scored balloon dilatation catheter according to claim 6, characterized in that: A portion of the first connecting rod (31) close to the first fixing member (6) is provided with a fifth sliding groove (312) extending along the length direction of the first connecting rod (31), the fifth sliding groove (312) and the second sliding groove (311) are not connected on the first connecting rod (31), and the first pin (34) is slidably connected to the fifth sliding groove (312); a portion of the second connecting rod (32) close to the second fixing member (7) is provided with a sixth sliding groove (322) extending along the length direction of the second connecting rod (32), the sixth sliding groove (322) and the third sliding groove (321) are not connected on the second connecting rod (32), and the second pin (35) is slidably connected to the sixth sliding groove (322).

8. The scored balloon dilatation catheter according to claim 1, characterized in that: The cross section of the notched member (4) is L-shaped.

9. The scored balloon dilatation catheter according to claim 1, characterized in that: The notch mechanisms are arranged at three or more locations at even intervals around the circumference of the balloon (2).

Images