A balloon dilatation catheter

Abstract

The present invention provides a balloon dilatation catheter, belonging to the technical field of balloon dilatation catheters; the balloon dilatation catheter comprises a catheter body, wherein a balloon body for dilating a stenotic site is provided at the distal end of the catheter body, and an operating handle for filling and releasing a filling medium into the balloon body is provided at the proximal end; a flow channel for blood flow is formed on the balloon body and / or between the balloon body and the outer side wall of the catheter body along the axial extension direction of the catheter body; during operation, the balloon body is inflated to treat the stenotic site, and the blood flow in the stenotic site continues to flow through the flow channel; the balloon dilatation catheter is mainly used to solve the technical problems in the prior art of insufficient distal blood supply caused by blood flow blockage during balloon expansion, and insufficient contact time between the balloon and the blood vessel wall affecting the drug transfer effect.

Description

Technical Field

[0001] The invention belongs to the technical field of balloon dilatation catheters, and particularly relates to a balloon dilatation catheter. Background Art

[0002] Balloon dilatation catheters are widely used in dilatation and angioplasty surgeries to treat vascular stenosis. They are generally composed of a balloon, a catheter, a catheter seat, and other parts. The balloon is usually made of polymer materials and has good elasticity and pressure resistance; the catheter rod is used to deliver the balloon to the lesion site and usually has a certain degree of flexibility and rigidity to ensure smooth delivery in blood vessels or other lumens; the catheter seat is used to connect a syringe or other pressure device to inject liquid or gas into the balloon.

[0003] The working principle of the balloon dilatation catheter is to insert the balloon dilatation catheter into the narrow part of the human blood vessel through interventional technology, and then inject a certain amount of liquid or gas into the balloon to expand the balloon, and use the expansion force of the balloon to expand the narrow lumen, thereby achieving the purpose of expanding the inner diameter of the lumen and improving the patency of the lumen.

[0004] In order to prevent the blood vessels from narrowing again after the balloon is withdrawn, paclitaxel, rapamycin and other drugs that can treat blood vessel stenosis and inhibit restenosis can be sprayed on the surface of the balloon, or corresponding drugs with therapeutic effects can be sprayed on its surface according to the actual use of the balloon, so that the drugs can be released to the blood vessel wall in contact with it when the balloon is expanded, thereby achieving the corresponding therapeutic purpose.

[0005] The balloon of an existing endovascular dilatation catheter typically has a frustum-shaped end and a cylindrical straight section when inflated. When the balloon is inflated and dilates the blood vessel, the straight section of the balloon fully contacts the vessel wall at the site of the stenotic lesion, completely blocking blood flow within the vessel. After dilatation is complete, the balloon is depressurized and blood circulation resumes. If blood flow is blocked for too long, it can lead to insufficient blood supply to the distal vessels, causing clinical manifestations such as dizziness, nausea, vomiting, and confusion, as well as damage to distal tissues such as the brain, and in severe cases, death. However, if the duration of balloon dilatation is too short, especially when the stenosis is severe or the lesion at the site of the stenosis has abnormal characteristics such as calcification, the treatment effect is not ideal. In other words, the surgery cannot be performed according to the ideal dilatation time, and the desired dilatation effect cannot be achieved. Furthermore, the drugs sprayed on the surface of existing endovascular dilatation catheters cannot completely block blood flow for a long time, resulting in insufficient contact time between the balloon and the vessel wall, which prevents the drug from being fully transferred to the vessel wall, significantly reducing the treatment effect.

[0006] Therefore, it is necessary to provide an improved technical solution to the above-mentioned deficiencies in the prior art. Summary of the Invention

[0007] The purpose of the present invention is to provide a balloon dilatation catheter to solve the technical problems in the prior art of insufficient distal blood supply caused by blood flow blockage during balloon expansion and insufficient contact time between the balloon and the blood vessel wall affecting the drug transfer effect.

[0008] In order to achieve the above objectives, the balloon dilatation catheter of the present invention provides the following technical solutions:

[0009] A balloon dilatation catheter comprises a catheter body, wherein a balloon for dilating a stenotic site is provided at the distal end of the catheter body, and an operating handle for filling or releasing a filling medium into the balloon is provided at the proximal end. A flow channel for blood flow is formed on the balloon body and / or between the balloon body and the outer wall of the catheter body along the axial extension direction of the catheter body. During operation, the balloon body is inflated to treat the stenotic site, and blood flow in the stenotic site continues to flow through the flow channel.

[0010] As a further optimized technical solution, the balloon body is a circular ring structure, which is sleeved on the outside of the catheter body, and the gap between the inner wall of the circular ring structure and the outer wall of the catheter body constitutes the flow channel.

[0011] As a further optimized technical solution, at least one group of support channels for filling the balloon body is axially arranged between the balloon body and the catheter body. Each group of support channels includes a plurality of channel splits arranged at intervals along the circumference of the catheter body. Each of the channel splits is connected to the medium channel on the catheter body for supplying the filling medium to flow.

[0012] As a further optimized technical solution, the balloon body further includes a diversion cavity, which is arranged outside the catheter body, and the gap between the inner wall of the annular structure and the outer wall of the diversion cavity constitutes the flow channel.

[0013] As a further optimized technical solution, the balloon body is a plurality of spaced and coaxially arranged circular ring structures, the innermost circular ring structure is sleeved on the outside of the catheter body, and the gap between any two adjacent circular ring structures and the gap between the inner wall of the innermost circular ring structure and the outer wall of the catheter body form the flow channel.

[0014] As a further optimized technical solution, at least one group of support channels for filling the balloon is axially arranged between the balloon body and the catheter body and between adjacent circular ring structures. Each group of support channels includes a plurality of channel splits arranged at intervals along the circumference of the catheter body, and each of the channel splits is connected to the medium channel on the catheter body for supplying the filling medium to flow.

[0015] As a further optimized technical solution, the catheter body includes at least an outer protective layer and an inner guide layer, and the medium channel is arranged between the outer protective layer and the inner guide layer.

[0016] As a further optimized technical solution, the number of channel segments in each group of the supporting channels is the same.

[0017] As a further optimized technical solution, the channel segments in each group of the support channels are arranged in an axially aligned manner.

[0018] As a further optimized technical solution, a quick exchange port is provided on the catheter body.

[0019] Beneficial effects: The present invention forms a flow channel for blood flow between the balloon body and the outer wall of the catheter body and / or on the balloon body along the axial extension direction of the catheter body. During the treatment of stenosis during surgery, after the balloon body is expanded, the blood flow in the stenosis will flow normally through the flow channel, and blood flow blockage will no longer occur, thereby eliminating the limitations of the existing balloon catheter in terms of expansion time, which is conducive to achieving a more ideal treatment effect, and can effectively avoid various abnormal symptoms caused by blood flow blockage when the balloon body is filled, reduce the risk during clinical surgery, significantly improve the overall safety of the surgery, and provide more reliable protection for the patient's life and health. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings and the accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. Among them:

[0021] Figure 1 Schematic diagram of the overall structure and cross-section of the catheter body of Example 1 of the balloon dilatation catheter of the present invention;

[0022] Figure 2 Schematic diagram of the three-dimensional structure of the balloon body of Example 1 of the balloon dilatation catheter of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of an end face of the balloon body of Example 1 of the balloon dilatation catheter of the present invention;

[0024] Figure 4 Schematic diagram of perforations on the catheter body of balloon dilatation catheter embodiment 1 of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the balloon dilatation catheter embodiment 1 of the present invention, in which the channel is separated and connected to the catheter body and the balloon body;

[0026] Figure 6 Schematic diagram of the three-dimensional structure of the balloon body of Example 2 of the balloon dilatation catheter of the present invention;

[0027] Figure 7 This is a schematic diagram of an end face structure of a balloon body of Example 2 of a balloon dilatation catheter of the present invention;

[0028] Figure 8 Schematic diagram of the three-dimensional structure of the balloon body of Example 3 of the balloon dilatation catheter of the present invention;

[0029] Figure 9 This is a schematic diagram of an end face structure of a balloon body of Example 4 of a balloon dilatation catheter of the present invention;

[0030] Figure 10 Schematic diagram of the three-dimensional structure of the balloon body of Example 6 of the balloon dilatation catheter of the present invention;

[0031] Figure 11 This is a schematic diagram of the structure of an end face of the balloon body of Example 7 of the balloon dilatation catheter of the present invention;

[0032] Figure 12 Schematic diagram of the overall structure and cross-section of the catheter body of Example 8 of the balloon dilatation catheter of the present invention.

[0033] In the figure: 1. Catheter body; 101. Medium channel; 102. Outer protective layer; 103. Inner guide layer; 104. Quick exchange port; 105. Perforation; 106. Tip; 2. Balloon body; 201. Diversion cavity; 3. Operating handle; 4. Flow channel; 5. Channel split. DETAILED DESCRIPTION

[0034] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 are within the scope of protection of the present invention.

[0035] In the description of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixedly connected or detachably connected; they can be directly connected or indirectly connected through an intermediate component. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. In addition, the term "proximal end" refers to the end close to the operator, and "distal end" refers to the end away from the operator.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0037] The shapes and sizes of the components in the drawings do not reflect the actual proportions of the products, and are only intended to illustrate the contents of the present invention.

[0038] The present invention provides a balloon dilatation catheter having a flow channel 4 formed between the balloon body 2 and the outer wall of the catheter body 1 and / or on the balloon body along the axial extension of the catheter. This allows blood to flow through the flow channel 4 when the balloon body 2 is inflated to treat a stenotic site, effectively preventing the problem of insufficient blood supply to distal vessels caused by prolonged blood flow blockage. Furthermore, the balloon body 2 can be kept in contact with the vessel wall for a desired extended period of time, ensuring that the therapeutic drug sprayed on the outside of the balloon body 2 is fully transferred to the vessel wall, enhancing the therapeutic effect. For a specific implementation scheme, please refer to the examples below.

[0039] Example 1

[0040] like Figure 1 、 Figure 2 、 Figure 3 As shown, the balloon dilatation catheter includes a catheter body 1, a balloon body 2 and an operating handle 3.

[0041] The distal end of the catheter body 1 has an integral tip 106. This elongated tip 106 guides the catheter body 1 within the blood vessel. It accurately guides the catheter body 1 along the vessel's path, helping the surgeon more precisely deliver the balloon 2 to the target stenosis. This prevents the catheter body 1 from blindly advancing within the vessel, minimizing unnecessary contact and damage to the vessel wall and improving the accuracy and efficiency of the surgical procedure.

[0042] The tube body of the catheter body 1 includes an outer protective layer 102 and an inner guiding layer 103. The outer protective layer 102 is typically made of one or more materials selected from nylon, polyethylene, polytetrafluoroethylene, and polyurethane, effectively preventing the catheter body 1 from being corroded by intravascular substances, thereby extending the service life of the catheter body 1. At the same time, the surface of the outer protective layer 102 is typically coated with a hydrophilic coating to improve the permeability of the catheter body 1 in the blood vessels and reduce damage to the blood vessels. The inner guiding layer 103 is typically made of one or more materials selected from polyethylene, nylon, and polytetrafluoroethylene. Its smooth inner surface allows other surgical instruments such as guide wires to pass through the catheter body 1 and be precisely guided within the blood vessels. In other embodiments, a support layer braided with metal wire can also be provided between the outer protective layer 102 and the inner guiding layer 103 to ensure the shape stability of the catheter body 1. A gap is provided between the outer protective layer 102 and the inner guiding layer 103, which serves as a medium channel 101 for the filling medium that fills the balloon body 2. The distal end of the medium channel 101 extends to no more than the distal end of the balloon body 2. Therefore, the distal end of the outer protective layer 102 extends to no more than the distal end of the balloon body 2. This can make the diameter of the distal end of the catheter body 1 smaller and more convenient for moving toward the distal end of the blood vessel.

[0043] The operating handle 3 is located at the proximal end of the catheter body 1. Its main function is to connect to a syringe, pressure pump, or other medium-filling and discharging device. Before the operation begins, the doctor uses the operating handle 3 to inject a filling medium, such as saline solution or contrast agent, into the balloon body 2. For example, using saline solution as an example, the doctor pushes the syringe piston connected to the operating handle 3, causing the saline solution to flow into the balloon body 2 along the medium channel 101 within the catheter body 1, causing the balloon body 2 to gradually fill and expand, thereby opening the narrowed area of ​​the blood vessel. After the operation is completed, the doctor reverses the operating handle 3 to extract the filling medium from the balloon body 2, causing the balloon body 2 to retract, facilitating the smooth withdrawal of the catheter from the blood vessel.

[0044] The balloon body 2 is arranged at the distal end of the catheter body 1 and is used to dilate the narrow part in the blood vessel. In this embodiment, the balloon body 2 is a ring structure, which is sleeved on the outside of the catheter body 1. A group of support channels for filling the balloon body 2 are arranged axially between the balloon body 2 and the catheter body 1. The support channels include three channel segments 5 arranged evenly spaced along the circumference of the catheter body 1. One end of each channel segment 5 passes through the perforation 105 on the outer protective layer 102 (for details, please refer to Figure 4 、 Figure 5 ) is directly connected to the medium channel 101 on the catheter body 1 for the flow of filling medium, and the other end is connected to the annular balloon body 2. In this way, the gap between the inner sidewall of the annular structure and the outer sidewall of the catheter body 1, extending along the axial direction of the catheter body 1, constitutes the flow channel 4 for blood flow.

[0045] Furthermore, a hydrophilic coating is provided on the outside of the balloon body 2 to improve the permeability of the balloon body 2 in the blood vessel and reduce damage to the blood vessel.

[0046] During the operation, the doctor uses interventional technology to insert the balloon dilatation catheter into the narrowed part of the blood vessel through the peripheral blood vessels. The contrast agent is injected into the balloon body 2 as a filling medium through the operating handle 3, and the balloon body 2 gradually fills and expands to open the narrowed blood vessel. At this time, the blood flow in the blood vessel can continue to circulate through the flow channel 4 between the balloon body 2 and the outer wall of the catheter body 1, ensuring the blood supply to the distal tissue of the blood vessel. With the existence of the flow channel 4, the blood supply to the distal tissue will no longer be affected by the treatment time. Even if it is to ensure that the drug outside the balloon body 2 is fully absorbed, appropriately extending the support time of the balloon body 2 will not cause adverse effects on the patient, thereby improving the treatment effect and safety of the operation. After the operation, the doctor extracts the contrast agent in the balloon body 2 through the operating handle 3, causing the balloon body 2 to retract, and then withdraws the balloon dilatation catheter from the body.

[0047] Example 2

[0048] like Figure 6 、 Figure 7As shown, the catheter body 1 of this embodiment is basically the same as that of Example 1 in structure and material, but differs in the design of the balloon body 2. In this embodiment, the balloon body 2 not only includes a circular ring structure sleeved on the outside of the catheter body 1, but also includes a diversion cavity 201. The diversion cavity 201 is a thin-walled cylindrical shape that fits tightly on the outside of the catheter body 1. The diversion cavity 201 is connected to the medium channel 101 on the catheter body 1, and the channel split 5 is indirectly connected to the catheter body 1 through the diversion cavity 201. In this way, when the balloon body 2 is filled, the filling medium in the medium channel 101 first flows into the diversion cavity 201 through the perforation 105 on the outer protective layer 102, and then flows from the diversion cavity 201 into the channel split 5, and finally reaches the circular ring structure outside the balloon body 2.

[0049] In this embodiment, the gap between the outer wall of the flow-guiding cavity 201 of the balloon body 2 and the inner wall of the annular structure, extending along the axial direction of the catheter body 1 , constitutes a flow channel 4 for blood flow to pass through.

[0050] During the operation, when the balloon dilatation catheter reaches the stenosis site, the doctor inflates the balloon body 2 through the operating handle 3. Due to the presence of the diversion cavity 201, the blood flow can pass through the flow channel 4 more smoothly.

[0051] Example 3

[0052] like Figure 8 As shown, the catheter body 1 of this embodiment is basically the same as that of Example 1 in structure and material, but still differs in the design of the balloon body 2. At the same time, there is also a difference in the number of support channels. In this embodiment, the balloon body 2 is two spaced coaxial ring structures. The innermost ring structure is sleeved on the outside of the catheter body 1. Two groups of support channels for filling the balloon body 2 are arranged axially between the balloon body 2 and the catheter body 1 and between adjacent ring structures. Each group of support channels includes three channel splits 5 arranged circumferentially along the catheter body 1. Each channel split 5 is directly connected to the medium channel 101 on the catheter body 1 for the flow of the filling medium. In this way, the gap between the two adjacent ring structures and the gap between the inner sidewall of the innermost ring structure and the outer sidewall of the catheter body 1 form a flow channel 4 extending along the axial direction of the catheter body 1, which is used to supply blood flow.

[0053] During the operation, when the balloon dilatation catheter reaches the stenosis, the doctor inflates the balloon body 2 through the operating handle 3. The outer wall of the outermost circular structure of the balloon body 2 supports the stenosis in the blood vessel. The blood flows through the flow channel 4 on the balloon body 2 and between the balloon body 2 and the outer wall of the catheter body 1, and the blood flow will not be blocked.

[0054] Example 4

[0055] like Figure 9 As shown, the catheter body 1 of this embodiment is basically the same as that of Example 3 in structure and material, except that the design of the balloon body 2 is different from that of Example 3. In this embodiment, the balloon body 2 not only includes two annular structures sleeved on the outside of the catheter body 1, but also includes a diversion cavity 201. The diversion cavity 201 is a thin-walled cylindrical shape that fits tightly against the outside of the catheter body 1. The diversion cavity 201 is connected to the medium channel 101 on the catheter body 1, and the channel split 5 is indirectly connected to the catheter body 1 through the diversion cavity 201. In this way, when the balloon body 2 is filled, the filling medium in the medium channel 101 first flows into the diversion cavity 201 through the perforation 105 on the outer protective layer 102, and then flows from the diversion cavity 201 into the channel split 5, and finally reaches all the annular structures of the balloon body 2.

[0056] During the operation, when the balloon dilatation catheter reaches the stenotic area, the doctor inflates the balloon body 2 through the operating handle 3. The outer wall of the outermost circular structure of the inflated balloon body 2 supports the stenotic area in the blood vessel, and the blood flows through the flow channel 4 on the balloon body 2 without blocking the blood flow.

[0057] Example 5

[0058] The structure and material of the catheter body 1 of this embodiment are substantially the same as those of Example 3, except that the design of the balloon body 2 differs from that of Example 3. In this embodiment, the balloon body 2 comprises three coaxially spaced ring structures, with the innermost ring structure sheathed on the outside of the catheter body 1. Three groups of support channels for filling the balloon body 2 are axially arranged between the innermost ring structure of the balloon body 2 and the catheter body 1, as well as between any two adjacent ring structures. Each group of support channels comprises three channel segments 5 spaced circumferentially along the catheter body 1. Each channel segment 5, facing one end of the catheter body 1, directly connects to a medium channel 101 on the catheter body 1 for the flow of the filling medium. Thus, the gaps between any two adjacent ring structures and the gap between the inner sidewall of the innermost ring structure and the outer sidewall of the catheter body 1 form a flow channel 4 extending along the axial direction of the catheter body 1, which is used to allow blood to flow through.

[0059] Furthermore, in other embodiments, there may be more than three circular ring structures.

[0060] During the operation, when the balloon dilatation catheter reaches the stenosis, the doctor inflates the balloon body 2 through the operating handle 3. The outer wall of the outermost circular structure of the inflated balloon body 2 supports the stenosis in the blood vessel. The blood flows through the flow channel on the balloon body 2 and between the balloon body 2 and the outer wall of the catheter body 1, and the blood flow will not be blocked.

[0061] Example 6

[0062] like Figure 10 As shown, the catheter body 1 and balloon body 2 of this embodiment are essentially identical in structure and material to those of Example 1, but differ in the number of support channels. In this embodiment, three groups of support channels for filling balloon body 2 are axially disposed between balloon body 2 and catheter body 1. These support channels comprise five channel segments 5 spaced circumferentially along the catheter body 1. Each channel segment 5 has one end directly connected to the medium channel 101 on the catheter body 1 for the flow of filling medium through a perforation 105 in the outer protective layer 102, and the other end connected to the annular balloon body 2. In other words, the number of channel segments 5 within each group of support channels is identical, ensuring uniform and stable filling of balloon body 2.

[0063] Furthermore, to ensure smooth blood flow in the flow channel 4, the channel segments 5 in each group of supporting channels are arranged in an axially aligned manner. In other embodiments, the number of channel segments 5 in each group of supporting channels may be different and / or the channel segments 5 in each group of supporting channels may not be arranged in an axially aligned manner.

[0064] Example 7

[0065] like Figure 11 As shown, the structure and materials of the catheter body 1 and balloon body 2 of this embodiment are basically the same as those of Example 2, but there is a difference in the design of the number of support channels. In this embodiment, each set of support channels includes two channel segments 5 spaced apart along the circumference of the catheter body 1. The channel segments 5 are indirectly connected to the catheter body 1 through the diversion cavity 201. In this way, when the balloon body 2 is filled, the filling medium in the medium channel 101 first flows into the diversion cavity 201 through the perforations 105 in the outer protective layer 102, then flows from the diversion cavity 201 into the channel segments 5, and finally reaches the annular structure outside the balloon body 2.

[0066] Example 8

[0067] like Figure 12 As shown, the balloon body 2 of this embodiment can be substantially the same in structure and material as the balloon body 2 of any of the above-mentioned embodiments. The difference lies in the structure of the catheter body 1. In this embodiment, the catheter body 1 is provided with a quick exchange port 104. This facilitates the rapid replacement of instruments or media within the catheter during surgery, improving surgical efficiency. For example, if a guidewire needs to be replaced during surgery, the doctor can conveniently complete the operation through the quick exchange port 104.

[0068] During surgery, once the balloon dilatation catheter reaches the stenosis, the doctor inflates the balloon 2 using the operating handle 3. The presence of the diversion cavity 201 allows blood to flow more smoothly through the flow channel 4. If instruments or media need to be replaced during surgery, the doctor can conveniently complete the operation through the quick exchange port 104, making the entire surgical process more efficient and smoother.

[0069] It will be understood that the above description is merely exemplary and the embodiments of the present application do not limit this.

[0070] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A balloon dilatation catheter, characterized in that: The invention comprises a catheter body (1), wherein a balloon body (2) for dilating a stenotic site is provided at the distal end of the catheter body (1), and an operating handle (3) for filling or releasing a filling medium into the balloon body (2) is provided at the proximal end. A flow channel (4) for blood flow to pass through is formed between the balloon body (2) and the outer wall of the catheter body (1) along the axial extension direction of the catheter body (1). When in operation, the balloon body (2) is filled to treat the stenotic site, and the blood flow in the stenotic site continues to flow through the flow channel (4); The balloon body (2) is a circular ring structure, which is sleeved on the outside of the catheter body (1), and the gap between the inner wall of the circular ring structure and the outer wall of the catheter body (1) constitutes the flow channel (4); The balloon body (2) is a plurality of spaced and coaxially arranged circular ring structures, the innermost circular ring structure being sleeved on the outside of the catheter body (1), and the gap between any two adjacent circular ring structures and the gap between the inner side wall of the innermost circular ring structure and the outer side wall of the catheter body (1) forming the flow channel (4); At least one group of support channels for filling the balloon body (2) is provided axially between the balloon body (2) and the catheter body (1) and between adjacent annular structures. Each group of support channels includes a plurality of channel segments (5) arranged at intervals along the circumference of the catheter body (1). Each of the channel segments (5) is connected to a medium channel (101) on the catheter body (1) for supplying a filling medium.

2. The balloon dilatation catheter according to claim 1, characterized in that The balloon body (2) further comprises a flow guiding cavity (201), wherein the flow guiding cavity (201) is arranged outside the catheter body (1), and the gap between the inner side wall of the annular structure and the outer side wall of the flow guiding cavity (201) constitutes the flow channel (4).

3. The balloon dilatation catheter according to claim 1, characterized in that The catheter body (1) comprises at least an outer protective layer (102) and an inner guide layer (103), and the medium channel (101) is arranged between the outer protective layer (102) and the inner guide layer (103).

4. The balloon dilatation catheter according to claim 1, characterized in that The number of channel segments (5) in each group of support channels is the same.

5. The balloon dilatation catheter according to claim 4, characterized in that: The channel segments (5) in each group of the supporting channels are arranged in an axially aligned manner.

6. The balloon dilatation catheter according to claim 1 or 2, characterized in that: The catheter body (1) is provided with a quick exchange port (104).

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