Balloon catheter and blood vessel dilation device

Abstract

This invention discloses a balloon dilation catheter and vascular dilation device. The balloon dilation catheter includes an inner tube, an outer tube, a catheter seat, and a balloon. A guide wire is inserted into the inner tube. The outer tube is fitted onto the inner tube. The catheter seat has a first inlet and a second inlet, with the first inlet communicating with the inner tube and the second inlet communicating with the outer tube. A plurality of balloons are provided, each balloon sequentially fitted onto the inner tube, with the interior of the balloon communicating with the outer tube. First grooves are evenly distributed on the side of the balloon. In use, the balloon dilation catheter provided by this invention allows a medium to be introduced into the balloon through a second interface to inflate the balloon. The flat portion of the balloon adjacent to the first groove forms the occipital region, and the contact between adjacent balloons forms the second groove. The occipital region applies pressure to the lesion site for dilation, while the evenly distributed first and second grooves buffer the stress experienced during vascular dilation, reducing vascular damage and dissection while ensuring the safety of patient treatment.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a balloon dilation catheter and vascular dilation device. Background Technology

[0002] The global burden of cardiovascular disease has been increasing over the past two decades. Studies show that in 2019, the number of people suffering from cardiovascular disease worldwide reached 523 million, and the number of deaths caused by cardiovascular disease reached 18.6 million. Among different types of cardiovascular disease, deaths from atherosclerotic cardiovascular disease account for more than 60% of all cardiovascular disease deaths. Atherosclerosis begins with damage to the vascular intima under mechanical stress or biochemical stimulation, which induces a large number of white blood cells in the blood to migrate to the damaged intima. In the intima, they transform into foam cells and are responsible for engulfing fatty substances. At the same time, smooth muscle cells enter the arterial intima from the media of the arterial wall and begin to proliferate. Fat-laden cells, smooth muscle cells, and other substances (such as connective tissue, cholesterol crystals, and calcium) accumulate here and eventually form plaque-like deposits, namely atherosclerotic plaques. As the plaques gradually enlarge and protrude into the arterial channels, they can cause narrowing or blockage of the arteries, affecting normal blood flow.

[0003] Percutaneous transluminal angioplasty (PTA) using balloon dilatation catheters has become an important treatment for atherosclerotic diseases. This procedure uses an inflated, high-pressure balloon to stretch the blood vessel wall and break up atherosclerotic plaques, thereby reducing vessel wall tension and widening the narrowed blood vessel lumen. However, when using ordinary balloon dilatation catheters to dilate the narrowed area of ​​the artery, it often causes tearing of the intima in the narrowed area, leading to varying degrees of vascular dissection, and in severe cases, even requiring stent implantation for repair.

[0004] Due to the shortcomings of conventional balloon dilation catheters, existing balloon dilation catheters incorporate a wire restraint structure on the outside of the balloon. In the inflated state, this wire restraint structure segments the balloon into a series of occipital regions and grooves to dilate the vessel at the lesion site. However, in this restraint-type balloon dilation catheter, the wire and balloon are independent and not tightly integrated. When used to dilate vascular stents or severely calcified lesions, there is a risk during clinical procedures that the wire may become entangled in the stent or lesion during withdrawal, potentially causing the balloon to detach from the restraint structure or even break. This limits the application of restraint-type balloon dilation catheters to some extent. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to overcome the shortcomings of related technologies, and the present invention provides a balloon dilation catheter and a vascular dilation device.

[0006] This invention provides the following technical solution:

[0007] A balloon dilation catheter includes an inner tube, an outer tube, a catheter seat, and a balloon.

[0008] The inner tube is used to insert a guide wire; the outer tube is sleeved on the inner tube; the catheter seat is provided with a first inlet and a second inlet, the first inlet communicating with the inner tube and the second inlet communicating with the outer tube; a plurality of balloons are provided, each balloon being sequentially sleeved on the end of the inner tube away from the catheter seat, adjacent balloons being connected by a connecting assembly, and the balloon closer to the outer tube communicating with the outer tube; a plurality of first grooves are evenly distributed on the side of the balloon relative to the axis of the inner tube.

[0009] As a further improvement to the above technical solution, the two end faces of the balloon perpendicular to the axis of the inner tube are provided with rounded corners, and the rounded corners on the end faces of two adjacent balloons are spliced ​​together to form a second groove, and the first groove and the second groove are joined together to form a flow channel.

[0010] As a further improvement to the above technical solution, the number of rounded corners of the balloon is set to 1 to 3.

[0011] As a further improvement to the above technical solution, the width of the second groove is set between 0.5 mm and 30 mm, and the depth of the second groove is set between 1% and 50% of the balloon diameter.

[0012] As a further improvement to the above technical solution, the extension direction of the first groove is parallel to the axis of the inner tube.

[0013] As a further improvement to the above technical solution, the cross-sectional shape of the first groove is an inwardly concave arc-shaped groove, a rectangular groove, or a groove formed by splicing two externally tangent circular arcs.

[0014] As a further improvement to the above technical solution, the width of the first groove can be set between 0.5 mm and 30 mm, and the depth can be set between 1% and 50% of the balloon diameter.

[0015] As a further improvement to the above technical solution, the inner tube is provided with multiple marking rings.

[0016] As a further improvement to the above technical solution, the marking ring is specifically provided in two parts, which are respectively set in the two outermost balloons.

[0017] As a further improvement to the above technical solution, the marking ring is aligned with the interface between the rounded corner and the side of the end of the corresponding balloon that is away from the other balloons.

[0018] As a further improvement to the above technical solution, the connecting component includes a first connecting tube and a second connecting tube, the first connecting tube and the second connecting tube being respectively disposed at both ends of the corresponding balloon; the first connecting tube of the balloon can be inserted into the second connecting tube of the adjacent balloon.

[0019] As a further improvement to the above technical solution, the first connecting pipe and the second connecting pipe are fixedly connected.

[0020] As a further improvement to the above technical solution, the opening direction of the first inlet coincides with the axial direction of the inner tube.

[0021] As a further improvement to the above technical solution, the catheter seat is provided with a stress tube, which is fixedly connected to both the catheter seat and the outer tube.

[0022] As a further improvement to the above technical solution, the balloon is made of nylon (PA) material.

[0023] As a further improvement to the above technical solution, a plurality of the balloons are integrally formed by a mold or sequentially connected by connecting components.

[0024] As a further improvement to the above technical solution, the catheter seat has multiple second inlets, the number of which corresponds to the number of balloons. A multi-lumen catheter and the balloons form corresponding pathways, and the second inlets and the balloons are connected one-to-one through the corresponding pathways.

[0025] The present invention also provides a vascular dilation device, comprising a balloon dilation catheter as described in any one of the above-described embodiments.

[0026] Compared with related technologies, the advantages of this invention are:

[0027] The balloon dilation catheter provided by this invention aims to improve the safety and efficiency of the treatment process. During use, the physician first precisely inserts the balloon dilation catheter into the patient's blood vessel. Once the balloon dilation catheter is moved to the designated treatment location, the next step is to connect a second interface to a dedicated filling device. Through this interface, the physician can precisely control the introduction of media into the balloon, causing the balloon to gradually inflate and expand within the blood vessel.

[0028] When the balloon is fully inflated, a distinct occipital structure forms on the portion of the balloon adjacent to the first groove. This occipital structure accurately targets the lesion, applying pressure to create micro-tears at the lesion site, thus achieving effective dilation. Simultaneously, the first groove, spaced apart from the occipital structure, effectively releases the stress on the blood vessel wall during balloon dilation, preventing further tearing and the formation of vascular dissection, thereby reducing potential damage to the blood vessel and the risk of dissection formation. This design ensures the safety of the treatment process and provides patients with better treatment outcomes.

[0029] Furthermore, it is worth noting that the first groove on the outer wall of the balloon is pre-designed and formed without any additional assembly structure. This design feature significantly reduces the risk of the balloon becoming stuck during clinical surgery if it is necessary to withdraw the balloon dilation catheter, demonstrating the safety and reliability of this balloon dilation catheter.

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This diagram shows a schematic view of the balloon dilation catheter in one embodiment of the present invention.

[0033] Figure 2 This is a partial schematic diagram of a balloon dilation catheter from one perspective in one embodiment of the present invention;

[0034] Figure 3 It shows Figure 2 Enlarged view of point A in the middle;

[0035] Figure 4 This is a schematic diagram of the balloon structure from one perspective in one embodiment of the present invention;

[0036] Figure 5 A schematic diagram of the structure of the balloon in an inflated state according to one embodiment of the present invention is shown;

[0037] Figure 6 A schematic diagram of the balloon dilation catheter from one perspective is shown in another embodiment of the present invention;

[0038] Figure 7 A cross-sectional schematic diagram of the balloon is shown in one embodiment of the present invention.

[0039] Explanation of key component symbols:

[0040] 110-Inner tube; 111-Marker ring; 112-Tip; 120-Outer tube; 130-Catheter seat; 131-First inlet; 132-Second inlet; 133-Stress tube; 200-Balloon; 210-First groove; 220-Occipital region; 230-Rounded corner; 231-Second groove; 300-Connecting assembly; 310-First connecting tube; 320-Second connecting tube. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, 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 invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] Example 1

[0047] Combination Figure 1 , Figure 4 As shown, this embodiment provides a balloon dilation catheter, including an inner tube 110, an outer tube 120, a catheter seat 130, and a balloon 200.

[0048] The inner tube 110 is used to insert a guide wire; the outer tube 120 is sleeved on the inner tube 110; the catheter seat 130 is provided with a first inlet 131 and a second inlet 132, the first inlet 131 is connected to the inner tube 110, and the second inlet 132 is connected to the outer tube 120; a plurality of balloons 200 are provided, each balloon 200 is sequentially sleeved on the end of the inner tube 110 away from the catheter seat 130, two adjacent balloons 200 are connected by a connecting component 300, and the balloon 200 near the outer tube 120 is connected to the outer tube 120; a plurality of first grooves 210 are evenly distributed on the side of the balloon 200 relative to the axis of the inner tube 110, and the end of the inner tube 110 away from the catheter seat 130 is provided with a tip 112, which facilitates the catheter to pass through the blood vessel without damaging the inner wall of the blood vessel.

[0049] The balloon dilation catheter provided in this embodiment is designed to improve the safety and efficiency of the treatment process. During use, the physician first precisely inserts the balloon dilation catheter into the patient's blood vessel. Once the balloon dilation catheter is moved to the designated treatment location, the next step is to connect the second interface to a dedicated filling device. Through this interface, the physician can precisely control the inflow of media into the balloon 200, causing the balloon 200 to gradually inflate and expand within the blood vessel.

[0050] When the balloon 200 is fully inflated, a distinct occipital region 220 is formed on the portion of the balloon 200 adjacent to the first groove 210. This occipital region 220 can accurately target the lesion site, applying pressure to induce micro-tears at the lesion site, thereby achieving effective dilation. Simultaneously, the first groove 210, spaced apart from the occipital region 220, effectively releases the stress on the blood vessel wall during balloon dilation, preventing further tearing and the formation of vascular dissection, thus reducing potential damage to the blood vessel and the risk of dissection formation. This design ensures the safety of the treatment process and provides patients with better treatment outcomes.

[0051] Furthermore, it is worth noting that the first groove 210 on the outer wall of the balloon 200 is pre-designed and formed without any additional assembly structure. This design feature significantly reduces the risk of the balloon 200 becoming entangled with the stent or lesion site if the balloon dilation catheter needs to be withdrawn during clinical surgery, while also avoiding the safety hazard of small parts potentially being left inside the patient's body. This undoubtedly further improves the safety and reliability of the invention.

[0052] In some embodiments, the extension direction of the first groove 210 is parallel to the axis of the inner tube 110. By setting the extension direction of each of the first grooves 210 parallel to the axis of the inner tube 110, it is ensured that the groove direction is consistent with the blood flow direction during balloon dilation treatment, which can avoid excessive scouring of the blood vessel wall by the blood flow and reduce potential damage to the blood vessel. Of course, in other embodiments of the present invention, the first grooves 210 can also be arranged in other forms.

[0053] like Figure 5 As shown, in some embodiments, the balloon 200 has rounded corners 230 on both ends perpendicular to the axis of the inner tube 110. The rounded corners 230 on the ends of two adjacent balloons 200 are joined to form a second groove 231. The first groove 210 and the second groove 231 are joined to form a flow channel. By setting the rounded corners 230 on both ends of the balloon 200, on the one hand, the first groove 210 spaced apart from the occipital region 220 and the second groove 231 formed during balloon expansion can effectively release the stress on the blood vessel wall during balloon expansion, further improving the buffering effect on the stress on the blood vessel wall. On the other hand, through the second groove 231, the first groove 210 and the second groove 231 are joined to form a flow channel, which allows the blood in the blood vessel to continue to flow through the flow channel when the balloon is inserted into the corresponding blood vessel and the expansion action is performed and the expansion shape is maintained. This avoids complete blockage of the blood in the blood vessel and avoids blood blockage of the expanded blood vessel due to excessive treatment time, ensuring patient safety.

[0054] In some embodiments, the number of rounded corners 230 of the balloon 200 is set to 1 to 3, so that when two adjacent balloons 200 expand relative to each other and approach each other, the stability of the second groove 231 can be ensured.

[0055] Specifically, during the design process, the width of the first groove 210 was precisely set within a reasonable range, namely between 0.5 mm and 30 mm. This range was chosen to meet the specific needs of different application scenarios, ensuring that it can effectively achieve its intended function while maintaining structural stability and safety. Simultaneously, the depth of the first groove 210 was designed to be between 1% and 50% of the diameter of the balloon 200. This depth design takes into account the deformation characteristics of the balloon 200 during inflation and ensures that the groove can form sufficient accommodating space or a specific geometric shape on the surface of the balloon 200 to achieve specific therapeutic or interventional effects.

[0056] Similarly, the width of the second groove 231 is also set within a wide range from 0.5 mm to 30 mm. This design flexibility allows for flexible application on balloons 200 of different sizes and specifications, adapting to diverse medical needs. The depth of the second groove 231 also follows the principle of being proportional to the diameter of the balloon 200, that is, its depth is 1% to 50% of the diameter of the balloon 200. This design helps to achieve harmonious coexistence between the groove and the balloon 200, ensuring the effectiveness of the groove while avoiding unnecessary damage to the balloon 200 structure due to excessive depth.

[0057] Combination Figure 2 , Figure 3 As shown, in some embodiments, the inner tube 110 is provided with a plurality of marking rings 111; by providing the marking rings 111 on the inner tube 110, it is easier for doctors to determine the accurate position of the balloon 200 under imaging guidance, and to assist doctors in performing accurate treatment.

[0058] Specifically, the marking ring 111 can be made of platinum-iridium alloy material, which has a good imaging effect under X-ray machine.

[0059] In some embodiments, two marking rings 111 are specifically provided, respectively disposed between the two outermost balloons 200 and the inner tube 110; by disposing the marking rings 111 between the two outermost balloons 200 and the inner tube 110, medical personnel can quickly confirm the arrangement position of each balloon 200 by the position of the two marking rings 111, thereby improving the diagnostic efficiency of medical personnel.

[0060] In some embodiments, the rounded corner 230 of the end of the corresponding balloon 200 away from other balloons 200 is aligned with the interface of the side, so that the marking ring 111 is aligned with the effective expansion surface of the balloon 200, which facilitates the improvement of the accuracy of medical staff in determining the position of the balloon 200.

[0061] In some embodiments, a plurality of balloons 200 are integrally formed by a mold or sequentially connected by a connecting assembly 300, which facilitates production and processing, and effectively ensures the sealing performance when adjacent balloons 200 are connected.

[0062] In some embodiments, the connecting assembly 300 includes a first connecting tube 310 and a second connecting tube 320, which are respectively disposed at both ends of the corresponding balloon 200. The first connecting tube 310 of the balloon 200 can pass through the second connecting tube 320 of the adjacent balloon 200. The installation of the first connecting tube 310 and the second connecting tube 320 facilitates the docking and installation efficiency of the two adjacent balloons 200. In some embodiments, the first connecting tube 310 and the second connecting tube 320 are fixedly connected to avoid the problem of medium leakage due to gaps when the adjacent balloons 200 are connected, thus ensuring the reliability of this embodiment. Specifically, the two corresponding first connecting tubes 310 and second connecting tubes 320 are fixedly connected by welding or bonding, which is convenient to operate and reliable in connection.

[0063] Of course, in other embodiments of the present invention, the plurality of balloons 200 can also be integrally molded by a mold, which can improve the production efficiency of this embodiment while ensuring the sealing effect when adjacent balloons 200 are connected.

[0064] In some embodiments, the opening direction of the first inlet 131 coincides with the axial direction of the inner tube 110, that is, the first inlet 131 is located at the end of the inner tube 110 away from the balloon 200, so that the guide wire can be kept straight and pass through the inner tube 110 from the first inlet 131, and then enter the patient's body, which facilitates medical staff to quickly exchange different types of guide wires.

[0065] Specifically, the second inlet 132 of the catheter hub 130 is at an angle to the opening direction of the first inlet 131, thereby reducing the interference to the opening of the inner tube 110 when the medium is introduced into the outer tube 120 through the second inlet 132, facilitating the insertion of the guide wire into the inner tube 110 by medical personnel. Of course, as... Figure 6As shown, the first inlet 131 can also be located at the end of the outer tube 120 near the side of the balloon 200. The advantage of this design is that balloon catheters of different specifications can be quickly replaced, which expands the applicability of this embodiment.

[0066] In some embodiments, the conduit seat 130 is provided with a stress tube 133, which is fixedly connected to the conduit seat 130 and the outer tube 120 respectively, and can prevent the adhesive structure between the conduit seat 130 and the outer tube 120 from failing due to bending.

[0067] In some embodiments, the balloon 200 is made of nylon (PA), which is suitable for dilation within extremely narrow blood vessels due to its high strength and low compliance. Nylon also possesses good thermal and chemical stability. Of course, in other embodiments of the invention, the balloon 200 may also be made of other materials such as polyethylene terephthalate, polyether block polyamide, or polyurethane to ensure normal expansion and contraction of the balloon 200.

[0068] In some embodiments, the catheter hub 130 has multiple second inlets 132, the number of which corresponds to the number of balloons 200. A multi-lumen catheter forms a corresponding passage with the balloons 200, and the second inlets 132 and the balloons 200 are connected one-to-one through the corresponding passages. This facilitates the inflation of the corresponding balloons 200 by introducing a medium into the corresponding second inlet 132, thereby enabling accurate control of the multiple balloons 200.

[0069] The cross-sectional shape of the balloon 200 is as follows: Figure 7 As shown, this design is meticulously planned to optimize the performance and effectiveness of the balloon 200 in specific medical applications. Regarding the shape of the first groove 210, its design flexibility lies in its various possible forms to meet different usage requirements. Specifically, the first groove 210 can be designed as consisting of two externally tangent arcs. This shape facilitates a smooth transition between the guide groove and the surrounding structure, reduces resistance during the expansion or contraction of the balloon 200, and improves the overall smoothness of operation.

[0070] Alternatively, the first groove 210 can also be a concave arc-shaped groove. This design not only conforms to the principles of fluid dynamics and can provide more uniform support when the balloon 200 is inflated, but also maximizes the area of ​​the circle formed when the cross-sectional perimeter of the balloon 200 remains unchanged. This means that the concave arc-shaped groove is more likely to form a groove with a large volume, allowing more blood flow during dilation treatment.

[0071] Furthermore, to meet the needs of certain specific application scenarios, the first groove 210 can also be designed as a rectangular groove. The rectangular groove has a simple and clear shape, is easy to process and manufacture, and its geometry helps to enhance the anchoring effect of the balloon 200 in the blood vessel.

[0072] In summary, the shape design of the first groove 210 fully considers factors such as the usage environment, functional requirements, and manufacturing process of the balloon 200. By providing a variety of optional shapes, it ensures the adaptability and reliability of the balloon 200 in different medical scenarios.

[0073] Example 2

[0074] The present invention also provides a vascular dilation device for inserting and dilating blood vessels at the lesion site of a patient as needed, including the balloon dilation catheter described in Example 1. The vascular dilation device has all the beneficial effects of the balloon dilation catheter, which will not be described in detail here.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A balloon dilation catheter, characterized in that, include: Inner tube, wherein a guide wire is inserted; The outer tube is fitted onto the inner tube; A catheter hub, wherein the catheter hub is provided with a first inlet and a second inlet, the first inlet communicating with the inner tube and the second inlet communicating with the outer tube; The balloon is provided in multiples, each balloon is sleeved on the end of the inner tube away from the catheter seat, and the interior of the balloon is in communication with the outer tube; a plurality of first grooves are evenly distributed on the side of the balloon, and the extending direction of the first grooves is parallel to the axis of the inner tube. The balloon has rounded corners on both ends of its end face perpendicular to the axis of the inner tube. The rounded corners on the end faces of two adjacent balloons are joined together to form a second groove. The first groove and the second groove are joined together to form a flow channel.

2. The balloon dilation catheter according to claim 1, characterized in that, The number of rounded corners of the balloon is set to 1 to 3.

3. The balloon dilation catheter according to claim 1, characterized in that, The width of the second groove is set between 0.5 mm and 30 mm, and the depth of the second groove is set between 1% and 50% of the balloon diameter.

4. The balloon dilation catheter according to claim 1, characterized in that, The cross-sectional shape of the first groove is an inwardly concave arc-shaped groove, a rectangular groove, or a groove formed by splicing two externally tangent circular arcs.

5. The balloon dilation catheter according to claim 1, characterized in that, The width of the first groove can be set between 0.5 mm and 30 mm, and the depth can be set between 1% and 50% of the balloon diameter.

6. The balloon dilation catheter according to claim 1, characterized in that, Multiple balloons are integrally formed by molding or sequentially connected by connecting components.

7. The balloon dilation catheter according to claim 1, characterized in that, The catheter hub has multiple second inlets, the number of which corresponds to the number of balloons. The outer tube has a passage corresponding to the balloon, and the second inlets are connected to the balloons through the corresponding passages.

8. A vasodilator, characterized in that, Includes the balloon dilation catheter as described in any one of claims 1 to 7.

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