Balloon dilatation catheter

Abstract

The application discloses a balloon dilatation catheter, and relates to the technical field of interventional treatment instruments, which comprises a catheter, a balloon, a plurality of constraint bearings, a conducting wire and a scoring device. The constraint bearing comprises a bearing inner ring fixedly connected with the catheter and a bearing outer ring sleeved on the outer periphery of the bearing inner ring and capable of rotating circumferentially relative to the bearing inner ring. The conducting wire is a rigid body and is connected to the bearing outer rings of the plurality of constraint bearings. The scoring device can move radially along the catheter along with the expansion of the balloon to score the tissue outside the balloon. The conducting wire is arranged in the central through hole of the scoring device. The conducting wire can transmit the torque applied to the proximal end to the scoring device at the distal end to drive the circumferential rotation of the scoring device. In this way, the circumferential position of the scoring device can be adjusted by rotating the bearing outer ring of the proximal constraint bearing, so that the scoring device can extrude and score the plaques at different circumferential positions of the inner wall of the blood vessel in the multiple scoring processes, and the expansion effect of the balloon dilatation catheter on the stenosis of the blood vessel is improved.

Description

Technical Field

[0001] This invention relates to the field of interventional therapy device technology, and specifically to a balloon dilation catheter. Background Technology

[0002] In interventional treatment of arterial occlusion, an expandable scoring balloon is typically used to dilate the blocked artery. The protrusions on the periphery of the scoring balloon are used to compress the plaque on the inner wall of the artery, thereby restoring arterial patency and improving blood flow.

[0003] In existing balloon dilation catheters, one or more scoring elements are fixedly disposed around the periphery of the scoring balloon. When the scoring balloon inflates, the externally protruding scoring elements can locally compress and score plaque on the vascular wall. Because the catheter is made of a relatively soft polymer material, it is difficult to rotate the scoring balloon at a corresponding angle by twisting the catheter externally. Therefore, existing scoring balloons have poor scoring effect on vascular wall plaque.

[0004] Therefore, how to improve the scoring effect of the scoring balloon is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a balloon dilation catheter to solve the problems of existing balloon dilation catheters, such as difficulty in rotating the scoring balloon and poor scoring effect on plaque on the vascular wall.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0007] A balloon dilation catheter, comprising: catheter; A balloon, connected to the distal end of the catheter, and capable of radial expansion relative to the catheter; Multiple constraint bearings are all sleeved on the outer periphery of the catheter. The multiple constraint bearings include a distal constraint bearing located at the distal end of the balloon and multiple proximal constraint bearings located at the proximal end of the balloon. Both the distal constraint bearing and the proximal constraint bearing include an inner bearing ring fixedly connected to the catheter and an outer bearing ring connected to the outer periphery of the inner bearing ring and capable of circumferentially rotating relative to the inner bearing ring. The conductive wire is a rigid body. The distal end of the conductive wire is fixedly connected to the outer ring of the distal constraint bearing, and the proximal end of the conductive wire is movably connected to the outer ring of multiple proximal constraint bearings. A scoring element is located on the outer periphery of the balloon. The scoring element has a central through hole that extends through both ends axially. The scoring element can move radially along the catheter as the balloon expands to score the tissue outside the balloon. The conduction wire passes through the central through hole and is fixedly connected to the scoring element. The conduction wire can transmit the torque applied to its proximal end to the scoring element to drive the scoring element to rotate circumferentially around the balloon.

[0008] Furthermore, the constrained bearing also includes a plurality of balls disposed between the inner ring and the outer ring of the bearing, the plurality of balls creating a gap between the inner ring and the outer ring of the bearing.

[0009] Furthermore, the notched part is made of shape memory alloy material.

[0010] Furthermore, multiple scoring elements and conductive wires are arranged circumferentially along the catheter, with the multiple scoring elements evenly spaced circumferentially around the outer periphery of the balloon, and each scoring element connected to one conductive wire.

[0011] Furthermore, the outer ring of the bearing is provided with multiple mounting through holes; the distal end of the conductive wire is fixedly connected to the mounting through hole of the outer ring of the distal constraint bearing, and the proximal end of the conductive wire is movably inserted through the mounting through hole of the outer ring of the proximal constraint bearing.

[0012] Furthermore, the proximal end of the conductive wire is connected to a plug with an outer diameter larger than the outer diameter of the mounting through hole. The plug is used to restrict the conductive wire from sliding out of the mounting through hole of the proximal constraint bearing located at the nearest end.

[0013] Furthermore, the conduction wire has a central channel inside, the proximal opening of the central channel is blocked by the occlusion head, the distal opening of the central channel is located on the conduction wire at the distal end of the balloon, and the portion of the conduction wire at the proximal end of the balloon also has a radial through hole communicating with the central channel. The radial through hole and the central channel allow blood to flow at both ends of the balloon.

[0014] Furthermore, there is at least one distal constraint bearing and at least two proximal constraint bearings.

[0015] Furthermore, the outer circumference of the outer ring of the proximal constraint bearing located at the nearest end is provided with scale lines.

[0016] The catheter 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 is connected to the inner tube, and the proximal end of the balloon is connected to the outer tube. The inner tube extends through the balloon. The space between the outer tube and the inner tube is the balloon inflation cavity, and the inner lumen of the inner tube is the guidewire lumen through which the guidewire passes.

[0017] Furthermore, the proximal end of the catheter is connected to a catheter seat, which has an internal hollow structure. The catheter seat is provided with a balloon inflation / deflation port communicating with the balloon inflation chamber and a guidewire port communicating with the guidewire chamber. The proximal end of the inner tube is connected to the guidewire port.

[0018] The balloon dilation catheter provided by the present invention has the following advantages: by sleeved around the outer periphery of the catheter with a distal constraint bearing located at the distal end of the balloon and a proximal constraint bearing located at the proximal end of the balloon, and connecting a guide wire between the outer rings of the distal constraint bearing and the proximal constraint bearing, and the guide wire being fixedly inserted through the central through hole of the scoring element, since the guide wire itself is a rigid body, the torque applied to the proximal end of the guide wire can be transmitted to the scoring element at the distal end of the guide wire, thereby driving the scoring element to rotate circumferentially around the balloon. When using this balloon dilation catheter, the balloon is initially in a contracted state. Once the balloon reaches the lesion site, it is inflated. As the balloon expands, it drives the peripheral scoring element to move radially outward, scoring the plaque on the vessel wall. When it is necessary to adjust the circumferential scoring position of the scoring element on the vessel wall, the balloon is depressurized, and the outer ring of the proximal constraint bearing located at the catheter's proximal end is rotated. The applied torque to this outer ring is transmitted to the peripheral scoring element of the balloon via a rigid conductive wire, causing the scoring element to rotate circumferentially around the vessel wall. The balloon is then inflated again, and the inflation again drives the scoring element to score different circumferential positions on the vessel wall. This process is repeated several times, allowing the peripheral scoring element to score plaque at different circumferential positions on the vessel wall, greatly improving the dilation effect of the scoring element on vascular stenosis symptoms during balloon angioplasty. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the balloon on the balloon dilation catheter in an embodiment of the present invention when the balloon is inflated. Figure 2 This is a front view of the balloon on the balloon dilation catheter in an embodiment of the present invention when the balloon is inflated. Figure 3 for Figure 2 A sectional view; Figure 4 This is a three-dimensional structural diagram of the balloon on the balloon dilation catheter in the embodiment of the present invention when it is in a depressurized state; Figure 5 This is a front view of the balloon on the balloon dilation catheter in the embodiment of the present invention when the balloon is in a depressurized state; Figure 6 for Figure 5 A sectional view; Figure 7 for Figure 6 Enlarged view of point A in the middle; Figure 8 This is a three-dimensional structural diagram of the proximal constraint bearing in an embodiment of the present invention; Figure 9 This is a right view of the proximal constraint bearing in an embodiment of the present invention; Figure 10 This is a three-dimensional structural diagram of the conductive wire in an embodiment of the present invention; Figure 11 This is a cross-sectional view of the conductive wire in an embodiment of the present invention; Figure 12 This is a diagram showing the effect of vascular scribing after the scribing component of the balloon dilation catheter in an embodiment of the present invention has scribed the inner wall of the blood vessel once; Figure 13 This is a diagram showing the effect of two scoring operations performed on the inner wall of a blood vessel by the scoring component of the balloon dilation catheter in an embodiment of the present invention. Figure 14 This is a diagram showing the effect of four scoring operations performed on the inner wall of a blood vessel by the scoring component of the balloon dilation catheter in an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached diagram: 1. Catheter; 1a. Balloon inflation chamber; 1b. Guidewire chamber; 11. Inner tube; 12. Outer tube; 2. Balloon; 3a. Distal restraint bearing; 3b. Proximal restraint bearing; 31. Inner ring of bearing; 32. Outer ring of bearing; 321. Mounting through hole; 322. Scale line; 33. Ball; 4. Conductor wire; 41. Occluder; 42. Central channel; 43. Radial through hole; 5. Score; 6. Catheter seat; 6a. Balloon inflation / deflation interface; 6b. Guidewire orifice; 7. Blood vessel; 7a. First score groove; 7b. Second score groove; 7c. Third score groove; 7d. Fourth score groove. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this application, it should be understood that the terms "proximal" and "distal" throughout refer to near and far relative to the operator. In use, the end closer to the doctor or operator is the "proximal" end, i.e., the end where the operator is located, and the end farther from the doctor or operator is the "distal" end, i.e., the end where the balloon is located. The above descriptions of orientation are for ease of description and simplification only, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this application.

[0024] In the description of this application, it should be noted that the terms "installation," "connection," and "linking" should be interpreted broadly, referring to direct connection, indirect connection through an intermediate medium, or internal connection between two components. Those skilled in the art can understand the specific meaning of these terms in the invention based on the specific circumstances.

[0025] like Figures 1 to 6 The illustrated balloon dilation catheter includes a catheter 1, a balloon 2, multiple constraint bearings, a guide wire 4, a scoring element 5, and a catheter seat 6. The balloon 2 is connected to the distal end of the catheter 1 and is capable of radial expansion relative to the catheter 1. Multiple constraint bearings are sleeved on the outer periphery of the catheter 1, including a distal constraint bearing 3a located at the distal end of the balloon 2 and multiple proximal constraint bearings 3b located at the proximal end of the balloon 2. The guide wire 4 connects between the outer rings 32 of the distal constraint bearings 3a and the multiple proximal constraint bearings 3b, which constrain the path of the guide wire 4. The scoring element 5 is located on the outer periphery of the balloon 2 and is fixedly connected to the guide wire 4.

[0026] like Figure 1 , Figure 2 , Figure 3 and Figure 7As shown, catheter 1 includes an inner tube 11 and an outer tube 12. The inner tube 11 passes through the interior of the outer tube 12. The distal end of balloon 2 is fixedly connected to the inner tube 11, and the proximal end of balloon 2 is fixedly connected to the outer tube 12. The inner tube 11 extends through the balloon 2. The space between the outer tube 12 and the inner tube 11 is the balloon inflation chamber 1a. The inner lumen of the inner tube 11 is the guidewire lumen 1b through which the guidewire passes. Catheter seat 6 is connected to the proximal end of catheter 1. Catheter seat 6 has a hollow internal structure. Catheter seat 6 is provided with a balloon inflation / deflation port 6a communicating with the balloon inflation chamber 1a and a guidewire port 6b communicating with the guidewire lumen 1b. The proximal end of the inner tube 11 is fixedly connected to the guidewire port 6b of catheter seat 6. In use, catheter 1 is guided by guidewire to the narrow position in the blood vessel. The filling medium can enter the inner lumen of balloon 2 through balloon inflation / deflation port 6a and balloon inflation chamber 1a to inflate balloon 2. After balloon 2 is inflated, its radial expansion can drive the scoring element 5 to score calcified tissue or plaque in the blood vessel.

[0027] like Figure 1 and Figure 7 As shown, the distal constraint bearing 3a and the proximal constraint bearing 3b have the same structure. Both the distal constraint bearing 3a and the proximal constraint bearing 3b include an inner bearing ring 31 and an outer bearing ring 32. The inner bearing ring 31 is fixedly connected to the outer circumference of the conduit 1, and the outer bearing ring 32 is sleeved and connected to the outer circumference of the inner bearing ring 31. The outer bearing ring 32 can maintain relative axial fixation and relative circumferential rotation with the inner bearing ring 31. A conductive wire 4 connects the outer bearing ring 32 of the distal constraint bearing 3a and the outer bearing rings 32 of the multiple proximal constraint bearings 3b.

[0028] like Figures 6 to 9 As shown, in some embodiments, both the distal restraint bearing 3a and the proximal restraint bearing 3b further include a plurality of balls 33 disposed between the inner ring 31 and the outer ring 32. The balls 33 allow the outer ring 32 to rotate circumferentially relative to the inner ring 31 without disengaging from it. Simultaneously, the balls 33 create a gap between the inner ring 31 and the outer ring 32. This gap allows blood flow between the two ends of the distal restraint bearing 3a or the proximal restraint bearing 3b, reducing the impact of the distal restraint bearing 3a or the proximal restraint bearing 3b on blood flow within the blood vessels. In alternative embodiments, the distal restraint bearing 3a and the proximal restraint bearing 3b can be sliding bearings without balls. In this case, the inner ring 31 is a sliding bearing, and the outer ring 32 is a sleeve fitted around the outer circumference of the sliding bearing.

[0029] like Figures 1 to 6As shown, in some embodiments, the number of distal restraint bearings 3a is one, and the number of proximal restraint bearings 3b is three. Each proximal restraint bearing 3b includes at least one proximal restraint bearing 3b located near the proximal end of the balloon 2, and another proximal restraint bearing 3b located at the closest end and capable of manual operation. In alternative embodiments, the number of distal restraint bearings 3a may be more than one, and the number of proximal restraint bearings 3b may be two or more.

[0030] like Figures 1 to 6 As shown, the conductive wire 4 is a rigid body. The distal end of the conductive wire 4 is fixedly connected to the outer ring 32 of the distal constraint bearing 3a, and the proximal end of the conductive wire 4 is movably connected along the axial direction of the conduit 1 to the outer ring 32 of multiple proximal constraint bearings 3b. The scoring element 5 is located on the outer periphery of the balloon 2. The scoring element 5 has a central through hole (not shown) that extends through both ends axially. The scoring element 5 can move radially along the conduit 1 as the balloon 2 expands to score the calcified tissue or plaques on the outside of the balloon 2. The conductive wire 4 passes through the central through hole of the scoring element 5 and is bonded and fixed to the scoring element 5. The conductive wire 4 can transmit the torque applied to its proximal end to the scoring element 5 to drive the scoring element 5 to rotate circumferentially around the balloon 2.

[0031] like Figures 1 to 6 As shown, the balloon 2 is spindle-shaped when inflated. The notched elements 5 are attached only to the outer periphery of the middle portion of the balloon 2, but are not fixedly connected to the outer wall of the balloon 2. Three notched elements 5 are evenly spaced around the circumference of the balloon 2, and the length direction of the three notched elements 5 extends along the axial direction of the balloon 2. It can be understood that the number of notched elements 5 on the outer periphery of the balloon 2 is not limited to three, and can be other numbers.

[0032] In some embodiments, the scoring element 5 is specifically made of shape memory alloy material. Under cryogenic conditions, the scoring element 5 is flat to conform to the surface of the balloon 2, resulting in a smaller overall outer diameter of the balloon dilation catheter for easier delivery. When the balloon 2 inflates within the blood vessel, the scoring element 5 on its periphery heats up upon contact with the vessel wall. Triggered by body temperature, the scoring element 5 deforms into a preset raised scoring shape, compressing the calcified tissue or plaque on the vessel wall and scoring it. When the balloon 2 deflates and contracts, the scoring element 2 disengages from the vessel wall tissue and automatically returns to its flat shape due to its shape memory function, allowing the balloon dilation catheter to be withdrawn from the blood vessel. This improves the repeatability and withdrawal safety of the balloon dilation catheter. Specifically, the cross-section of the scoring element 5 in the preset raised scoring shape can be triangular or other shapes.

[0033] like Figures 1 to 6As shown, in some embodiments, three conductive wires 4 are arranged circumferentially along the conduit 1, with each notch 5 connected to one conductive wire 4. It is understood that the number of conductive wires 4 is not limited to three, and the number of conductive wires 4 is adaptively set according to the number of notches 5.

[0034] like Figure 7 , Figure 8 and Figure 9 As shown, in some embodiments, the outer ring 32 of the bearing is provided with multiple mounting through holes 321; the distal end of the conductive wire 4 is bonded and fixed to the mounting through hole 321 of the outer ring 32 of the distal constraint bearing 3a, and the proximal end of the conductive wire 4 is axially movable through the mounting through hole 321 of the outer ring 32 of the bearing. A sealing head 41 with an outer diameter larger than the mounting through hole 321 is connected to the proximal end of the conductive wire 4. The sealing head 41 is used to restrict the conductive wire 4 from sliding out of the mounting through hole 321 of the outer ring 32 of the proximal constraint bearing 3b located at the nearest end. A scale line 322 is provided on the outer periphery of the outer ring 32 of the proximal constraint bearing 3b located at the nearest end. The scale line 322 is used to indicate the rotation angle.

[0035] like Figures 1 to 6 , Figure 10 and Figure 11 As shown, the distal end of the conduction wire 4 can bend in accordance with the radial expansion of the balloon 2. When the balloon 2 is inflated, the portion of the conduction wire 4 located on the periphery of the balloon 2 bends into a bent shape that matches the shape of the balloon 2; when the balloon 2 is depressurized, the conduction wire 4 returns to a straight shape as a whole.

[0036] like Figures 1 to 6 , Figure 10 and Figure 11 As shown, in some embodiments, the conduction wire 4 is a hollow tube structure with a central channel 42 inside. The proximal end of the central channel 42 is blocked, and the distal opening of the central channel 42 is located at the distal end of the conduction wire 4. The portion of the conduction wire 4 located near the proximal end of the balloon 2 also has a radial through-hole 43 communicating with the central channel 42. The radial through-hole 43 communicates with the central channel 42, allowing blood flow between both ends of the balloon 2 in its inflated state without causing complete vascular blockage. This provides sufficient surgical time for balloon dilation, allowing subsequent operations such as rotating the scoring element 5 and repeatedly inflating and deflating the balloon 2 to be performed within a safe surgical timeframe.

[0037] The procedure for using this type of balloon dilation catheter in balloon angioplasty is as follows: Before the catheter 1 is inserted into the blood vessel, the balloon 2 is in a depressurized state, and the scoring part 5 outside the balloon 2 is in a flat state that fits the surface of the balloon 2.

[0038] Catheter 1 is inserted into a blood vessel via a guidewire. When balloon 2 at the distal end of catheter 1 reaches the location of plaque and calcified lesions on the inner wall of the blood vessel, balloon 2 is inflated until it is fully inflated. At this point, the balloon dilates the catheter as follows: Figures 4 to 6 As shown, the balloon 2 in its inflated state drives the peripheral scoring element 5 to move radially outward. Upon contact with the calcified tissue or plaque on the vessel wall, the scoring element 5 heats up and deforms into a preset raised scoring shape triggered by body temperature. The scoring element 5 compresses the calcified tissue or plaque on the vessel wall, thus scoring the calcified tissue or plaque. At this time, the scoring effect of the balloon dilation catheter on the vessel wall is as follows: Figure 12 As shown, Figure 12 The three recesses are the first grooves 7a left by the first scoring of the three scoring parts 5 on the inner wall tissue of the blood vessel 7.

[0039] When it is necessary to adjust the circumferential notch position of the notching element 5 on the vascular endothelial tissue, first depressurize balloon 2 to put it in a depressurized state. At this time, the balloon dilation catheter is in the following state: Figures 4 to 6 As shown, in this state, the outer ring 32 of the proximal constraint bearing 3b located at the nearest end of catheter 1 is rotated. The applied torque on the outer ring 32 is transmitted to the scoring element 5 on the periphery of balloon 2 through the rigid conductive wire 4, causing the scoring element 5 to rotate a certain angle around the circumference of the blood vessel wall. Then, balloon 2 is inflated again. When balloon 2 is inflated, the scoring element 5 again compresses and scores different positions on the circumferential surface of the plaque on the blood vessel wall. At this time, the scoring effect of the balloon dilation catheter on the blood vessel wall is as follows: Figure 13 As shown, Figure 13 relatively Figure 12 The three newly added recesses are the second grooves 7b left by the three scoring parts 5 in the second scoring of the inner wall tissue of the blood vessel 7.

[0040] Repeating this process several times allows the scoring element 5 on the periphery of the balloon 2 to repeatedly score different circumferential locations on the plaque on the inner wall of the blood vessel. Figure 14 The image shows the effect of four scoring operations performed on the inner wall of a blood vessel using a scoring tool for a balloon dilation catheter. The scoring grooves left on the inner wall of the blood vessel 7 by the four scoring operations are groove 7a (first scoring), groove 7b (second scoring), groove 7c (third scoring), and groove 7d (fourth scoring).

[0041] After scoring is completed, balloon 2 is depressurized and the balloon dilation catheter is removed from the body.

[0042] The balloon dilation catheter provided by this invention comprises a distal restraint bearing 3a located at the distal end of the balloon 2 and a proximal restraint bearing 3b located at the proximal end of the balloon 2, sleeved around the outer periphery of the catheter 1. A transmission wire 4 is connected between the outer ring 32 of the distal restraint bearing 3a and the outer ring 32 of the proximal restraint bearing 3b, and the transmission wire 4 is fixedly inserted through the central through hole of the scoring member 5. Since the transmission wire 4 itself is a rigid body, the torque applied to the proximal end of the transmission wire 4 can be transmitted to the scoring member 5 at the distal end of the transmission wire 4. Therefore, in use, the balloon 2 can be depressurized first, and then the distal restraint bearing 3b can be rotated. The outer ring 32 of a proximal constraint bearing 3b at the proximal end drives multiple scoring elements 5 on the periphery of balloon 2 to rotate around the circumference of the blood vessel wall at a certain angle via multiple conduction wires 4. Then, balloon 2 is inflated. When balloon 2 is inflated and expanded, it drives the scoring elements 5 to compress and score plaques at different circumferential positions on the blood vessel wall. Repeatedly, the scoring elements 5 on the periphery of balloon 2 can compress and score plaques at different circumferential positions on the blood vessel wall, which greatly improves the dilation effect of scoring elements 5 on vascular stenosis symptoms during vascular balloon angioplasty.

[0043] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A balloon dilation catheter, characterized in that, include: Catheter (1); A balloon (2) is connected to the distal end of the catheter (1) and is capable of radial expansion relative to the catheter (1); Multiple constraint bearings are sleeved on the outer periphery of the catheter (1). The multiple constraint bearings include a distal constraint bearing (3a) located at the distal end of the balloon (2) and multiple proximal constraint bearings (3b) located at the proximal end of the balloon (2). Both the distal constraint bearing (3a) and the proximal constraint bearing (3b) include a bearing inner ring (31) fixedly connected to the catheter (1) and a bearing outer ring (32) connected to the outer periphery of the bearing inner ring (31) and capable of circumferentially rotating relative to the bearing inner ring (31). The conductive wire (4) is a rigid body. The distal end of the conductive wire (4) is fixedly connected to the outer ring (32) of the distal constraint bearing (3a), and the proximal end of the conductive wire (4) is movably connected to the outer ring (32) of the proximal constraint bearings (3b). The distal end of the conductive wire (4) can bend in accordance with the radial expansion of the balloon (2). The scoring element (5) is located on the outer periphery of the balloon (2). The scoring element (5) has a central through hole that extends through both ends in the axial direction. The scoring element (5) can move radially along the catheter (1) as the balloon (2) expands to score the tissue outside the balloon (2). The conduction wire (4) passes through the central through hole and is fixedly connected to the scoring element (5). The conduction wire (4) can transmit the torque applied to its proximal end to the scoring element (5) to drive the scoring element (5) to rotate circumferentially around the balloon (2).

2. The balloon dilation catheter according to claim 1, characterized in that, The constrained bearing also includes a plurality of balls (33) disposed between the inner ring (31) and the outer ring (32) of the bearing, the plurality of balls (33) creating a gap between the inner ring (31) and the outer ring (32).

3. The balloon dilation catheter according to claim 1, characterized in that, The etched part (5) is made of shape memory alloy material.

4. The balloon dilation catheter according to claim 1, characterized in that, Multiple of the scoring elements (5) and the conductive wires (4) are arranged circumferentially along the catheter (1). Multiple scoring elements (5) are evenly spaced circumferentially around the outer periphery of the balloon (2), and each scoring element (5) is connected to a conductive wire (4).

5. The balloon dilation catheter according to claim 1, characterized in that, The outer ring (32) of the bearing is provided with a plurality of mounting through holes (321); the distal end of the conductive wire (4) is fixedly connected to the mounting through hole (321) of the outer ring (32) of the distal constraint bearing (3a), and the proximal end of the conductive wire (4) is movably inserted through the mounting through hole (321) of the outer ring (32) of the proximal constraint bearing (3b).

6. The balloon dilation catheter according to claim 5, characterized in that, The proximal end of the conductive wire (4) is connected to a plug (41) with an outer diameter larger than the mounting through hole (321). The plug (41) is used to restrict the conductive wire (4) from sliding out of the mounting through hole (321) of one of the proximal constraint bearings (3b) located at the nearest end.

7. The balloon dilation catheter according to claim 6, characterized in that, The conduction wire (4) has a central channel (42) inside. The proximal opening of the central channel (42) is blocked by the occlusion head (41). The distal opening of the central channel (42) is located on the conduction wire (4) at the distal end of the balloon (2). The portion of the conduction wire (4) located at the proximal end of the balloon (2) also has a radial through hole (43) communicating with the central channel (42). The radial through hole (43) and the central channel (42) allow blood to flow at both ends of the balloon (2).

8. The balloon dilation catheter according to claim 1, characterized in that, At least one distal constraint bearing (3a) is provided, and at least two proximal constraint bearings (3b) are provided.

9. The balloon dilation catheter according to claim 8, characterized in that, The outer circumference of the outer ring (32) of the proximal constraint bearing (3b) located at the nearest end is provided with scale lines (322).

10. The balloon dilation catheter according to claim 1, characterized in that, The catheter (1) includes an inner tube (11) and an outer tube (12). The inner tube (11) passes through the inside of the outer tube (12). The distal end of the balloon (2) is connected to the inner tube (11), and the proximal end of the balloon (2) is connected to the outer tube (12). The inner tube (11) passes through the balloon (2). The space between the outer tube (12) and the inner tube (11) is the balloon inflation chamber (1a). The inner lumen of the inner tube (11) is the guidewire lumen (1b) through which the guidewire passes. The proximal end of the catheter (1) is connected to a catheter seat (6). The catheter seat (6) has an internally hollow structure. The catheter seat (6) is provided with a balloon inflation / deflation port (6a) communicating with the balloon inflation chamber (1a) and a guidewire port (6b) communicating with the guidewire lumen (1b). The proximal end of the inner tube (11) is connected to the guidewire port (6b).

Images