Balloon dilatation catheter and blood vessel dilatation equipment

Abstract

The invention discloses a balloon dilatation catheter and a blood vessel dilatation device. The balloon dilatation catheter comprises an inner tube, an outer tube, a catheter base and a balloon, and a guide wire is arranged in the inner tube in a penetrating mode; the outer pipe is sleeved on the inner pipe; a first inlet and a second inlet are formed in the guide pipe seat, the first inlet is communicated with the inner pipe, and the second inlet is communicated with the outer pipe; the multiple balloons are sequentially arranged on the inner tube in a sleeving mode, and the interiors of the balloons are communicated with the outer tube. First grooves are uniformly distributed in the side surface of the balloon; when the balloon dilatation catheter is used, media are introduced into the balloons through the second connectors to enable the balloons to be filled and expanded, the flat portions, adjacent to the first grooves, of the balloons form occipital portions, the adjacent balloons make contact with each other to form the second grooves, the occipital portions can exert pressure on diseased regions to conduct dilatation, and therefore the diseased regions can be dilated. The first grooves and the second grooves which are evenly distributed can buffer stress borne by the released blood vessel during expansion, blood vessel injuries and interlayers are reduced, and meanwhile the treatment safety of a patient is guaranteed.

Description

Technical Field

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

[0002] The global burden of cardiovascular disease has been increasing over the past two decades. Studies have shown that in 2019, the number of people suffering from cardiovascular disease worldwide reached 523 million, and the number of deaths from cardiovascular disease reached 18.6 million. Among different types of cardiovascular diseases, the number of deaths due to atherosclerotic cardiovascular disease has accounted for more than 60% of the total number of deaths from cardiovascular disease. Atherosclerosis begins when the vascular endothelium is damaged by mechanical stress or biochemical stimulation, which in turn induces a large number of white blood cells in the blood to migrate to the damaged endothelium, where they transform into foam cells and are responsible for engulfing fatty substances. At the same time, smooth muscle cells enter the endothelium of the arterial wall from the middle layer 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, etc.) accumulate here and eventually form patchy deposits, namely atheroma or atherosclerotic plaques. As the plaques gradually grow and protrude into the arterial duct, they can cause narrowing or blockage of the arterial duct, affecting normal blood flow.

[0003] Percutaneous angioplasty (PTA) using a balloon dilatation catheter has become one of the important means of treating atherosclerotic diseases. This treatment method uses an inflated high-pressure balloon to stretch the blood vessel wall and break atherosclerotic plaques to reduce the tension of the blood vessel wall and expand the diameter of the narrowed blood vessel. However, when using ordinary balloon dilatation catheters to dilate the narrowed part of the artery, it often causes the vascular endothelium in the narrowed area to tear, resulting in varying degrees of vascular dissection. In severe cases, stents may even need to be implanted to remedy the situation.

[0004] Based on the shortcomings of ordinary balloon dilatation catheters, existing balloon dilatation catheters have constructed a wire constraint structure on the outside of the ordinary balloon. In the expanded and filled state, the wire constraint structure will segment the balloon into a series of occipitals and grooves to dilate the blood vessels at the diseased site. However, the metal wire and balloon of the constrained balloon dilatation catheter are independent of each other, and the two are not tightly combined. When it is used to expand vascular stents or severely calcified blood vessels, there is a risk that the metal wire will be hooked by the stent or the diseased site during withdrawal during clinical surgery, which may cause the balloon to detach from the metal constraint structure or even cause breakage. This limits the application of constrained balloon dilatation catheters to a certain extent. Summary of the invention

[0005] In view of this, the purpose of the present invention is to overcome the deficiencies in the related art. The present invention provides a balloon dilatation catheter and a vascular dilatation device.

[0006] The present invention provides the following technical solutions:

[0007] A balloon dilatation catheter comprises an inner tube, an outer tube, a catheter seat and a balloon.

[0008] The inner tube is used to pass a guide wire; the outer tube is sleeved on the inner tube; the catheter seat is provided with a first entrance and a second entrance, the first entrance is connected to the inner tube, and the second entrance is connected to the outer tube; a plurality of balloons are provided, each of which is sequentially sleeved on the end of the inner tube away from the catheter seat, two adjacent balloons are connected by docking through a connecting component, and the balloon close to the outer tube is connected to 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 of the above technical solution, rounded corners are provided on the two end surfaces of the balloon perpendicular to the axis of the inner tube, the rounded corners on the end surfaces of two adjacent balloons are spliced ​​to form a second groove, and the first groove and the second groove are connected to form a diversion channel.

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

[0011] As a further improvement of 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 of the above technical solution, an extending direction of the first groove is parallel to the axis of the inner tube.

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

[0014] As a further improvement of 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 of the above technical solution, a plurality of marking rings are provided on the inner tube.

[0016] As a further improvement of the above technical solution, there are specifically two marking rings, which are respectively arranged in the two balloons on the two sides.

[0017] As a further improvement of 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 away from the other balloons.

[0018] As a further improvement of the above technical solution, the connecting assembly includes a first connecting tube and a second connecting tube, and the first connecting tube and the second connecting tube are respectively arranged at two ends of the corresponding balloon; the first connecting tube of the balloon can penetrate into the second connecting tube of the adjacent balloon.

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

[0020] As a further improvement of 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 of the above technical solution, a stress tube is provided on the catheter seat, and the stress tube is fixedly connected to the catheter seat and the outer tube at the same time.

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

[0023] As a further improvement of the above technical solution, the plurality of balloons are integrally formed by a mold or are sequentially connected and butt-jointed by connection components.

[0024] As a further improvement of the above technical solution, the catheter seat is provided with a plurality of second inlets, the number of the second inlets corresponds to the number of the balloons, a corresponding passage is formed with the balloons through the multi-lumen catheter, and the second inlets are connected one-to-one with the balloons through the corresponding passage.

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

[0026] Compared with the related art, the beneficial effects of the present invention are:

[0027] The balloon dilatation catheter provided by the present invention is intended to improve the safety and efficiency of the treatment process. During use, the doctor first accurately inserts the balloon dilatation catheter into the patient's blood vessel. Once the balloon dilatation catheter is moved to the designated location that needs treatment, the next step is to connect the second interface to a dedicated filling device. Through this interface, the doctor can accurately control the medium to enter the balloon, so that the balloon gradually expands and expands in the blood vessel.

[0028] When the balloon is in a fully expanded state, the part of the balloon adjacent to the first groove will form an obvious pillow structure. This pillow can accurately act on the lesion site, and by applying a certain pressure, it will cause a tiny tear in the lesion site, thereby achieving an effective expansion effect. At the same time, the first groove spaced apart from the pillow effectively releases the stress on the blood vessel wall during balloon expansion, preventing the further expansion of the tear and the formation of a 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 effects.

[0029] In addition, it is worth noting that the first groove on the outer wall of the balloon is pre-designed and formed without additional assembly structure. This design feature can significantly reduce the risk of the balloon getting stuck if the balloon dilatation catheter needs to be withdrawn during clinical surgery, reflecting the safety and reliability of the use of the balloon dilatation catheter.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A schematic structural diagram of a balloon dilatation catheter from one perspective in one embodiment of the present invention is shown;

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

[0034] Figure 3 Shows Figure 2 The enlarged schematic diagram of point A in the middle;

[0035] Figure 4 A schematic diagram of the structure of a balloon in one embodiment of the present invention is shown;

[0036] Figure 5 It shows a schematic structural diagram of a balloon in an expanded state in one embodiment of the present invention;

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

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

[0039] Description of main component symbols:

[0040] 110-inner tube; 111-marking ring; 112-tip; 120-outer tube; 130-catheter seat; 131-first entrance; 132-second entrance; 133-stress tube; 200-balloon; 210-first groove; 220-occipital; 230-rounded corner; 231-second groove; 300-connecting assembly; 310-first connecting tube; 320-second connecting tube. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] Example 1

[0047] Combination Figure 1 , Figure 4 As shown, this embodiment provides a balloon dilatation 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 pass 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; the balloon 200 is provided in plurality, each of the balloons 200 is sleeved in sequence on the end of the inner tube 110 away from the catheter seat 130, two adjacent balloons 200 are connected by docking through a connecting assembly 300, and the balloon 200 close to 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 a tip 112 is provided at the end of the inner tube 110 away from the catheter seat 130, so as to facilitate the passage of the catheter in the blood vessel without damaging the inner wall of the blood vessel.

[0049] The balloon dilatation catheter provided in this embodiment is intended to improve the safety and efficiency of the treatment process. During use, the doctor first accurately inserts the balloon dilatation catheter into the patient's blood vessel. Once the balloon dilatation catheter is moved to the designated location that needs treatment, the next step is to connect the second interface to a dedicated filling device. Through this interface, the doctor can accurately control the medium to enter the balloon 200, so that the balloon 200 gradually expands and expands in the blood vessel.

[0050] When the balloon 200 is in a fully expanded state, the portion of the balloon 200 adjacent to the first groove 210 will form an obvious pillow 220 structure. This pillow 220 can accurately act on the lesion site, and by applying a certain pressure, a tiny tear is generated in the lesion site, thereby achieving an effective expansion effect. At the same time, the first groove 210 spaced apart from the pillow 220 effectively releases the stress on the blood vessel wall during balloon expansion, preventing the further expansion of the tear and forming a vascular dissection, thereby reducing the 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 effects.

[0051] In addition, 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 can significantly reduce the risk of the balloon 200 being entangled with the stent or the lesion if the balloon dilatation catheter needs to be withdrawn during clinical surgery, and also avoids the potential safety hazard of small parts being left in the patient's body. This undoubtedly further improves the safety and reliability of the present 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, this ensures that the groove direction is consistent with the blood flow direction during balloon dilatation treatment, thereby avoiding excessive scouring of the blood vessel wall by the blood flow and reducing 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, fillets 230 are provided on the two end surfaces of the balloon 200 that are perpendicular to the axis of the inner tube 110, and the fillets 230 on the end surfaces of the two adjacent balloons 200 are spliced ​​to form a second groove 231, and the first groove 210 and the second groove 231 are connected to form a diversion channel; by providing fillets 230 on the two end surfaces of the balloon 200, on the one hand, the first groove 210 spaced apart from the pillow 220 and the second groove 231 formed when the balloon is expanded can effectively release the stress on the blood vessel wall when the balloon is expanded, and further improve 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 connected to form a diversion channel, which can enable the blood in the corresponding blood vessel to continue to flow through the diversion channel when the embodiment penetrates into the corresponding blood vessel to perform an expansion action and maintain the expansion shape, thereby avoiding complete blockage of the blood in the blood vessel, avoiding blood blockage in the expanded blood vessel due to excessively long treatment time, and 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 are relatively expanded and approached, the stability of the second groove 231 can be ensured.

[0055] Specifically, during the design process, the width of the first groove 210 is precisely set within a reasonable range, that is, between 0.5 mm and 30 mm. This range is selected to meet the specific needs of different application scenarios, ensuring that it can effectively achieve its intended function while maintaining the stability and safety of the structure. At the same time, the depth of the first groove 210 is designed to be between 1% and 50% of the diameter of the balloon 200. Such a depth design takes into account the deformation characteristics of the balloon 200 during the expansion process, and also ensures that the groove can form sufficient accommodation space or a specific geometric shape on the surface of the balloon 200 to achieve a specific treatment or intervention effect.

[0056] Similarly, for the second groove 231, its width is also set within a wide range of 0.5 mm to 30 mm. Such design flexibility allows flexible application on balloons 200 of different sizes and specifications to meet 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. Such a design helps to achieve harmonious coexistence between the groove and the balloon 200, which not only ensures the effectiveness of the groove, but also avoids unnecessary damage to the structure of the balloon 200 due to excessive depth.

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

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

[0059] In some embodiments, two marking rings 111 are specifically provided, which are respectively arranged between the two balloons 200 on the outermost sides and the inner tube 110; by arranging the marking rings 111 between the two balloons 200 on the outermost sides and the inner tube 110, it is convenient for medical staff to quickly confirm the arrangement position of each balloon 200 through the positions of the two marking rings 111, thereby improving the diagnostic efficiency of medical staff.

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

[0061] In some embodiments, the plurality of balloons 200 are integrally formed by a mold or are sequentially connected and butted together by a connecting assembly 300, which is convenient for production and processing, and can effectively ensure the sealing when adjacent balloons 200 are connected.

[0062] In some embodiments, the connection assembly 300 includes a first connection tube 310 and a second connection tube 320, and the first connection tube 310 and the second connection tube 320 are respectively arranged at the two ends of the corresponding balloon 200; the first connection tube 310 of the balloon 200 can be inserted into the second connection tube 320 of the adjacent balloon 200; through the installation of the first connection tube 310 and the second connection tube 320, it is convenient to improve the docking installation efficiency of the two adjacent balloons 200. In some embodiments, the first connection tube 310 and the second connection tube 320 are fixedly connected to avoid the problem of medium leakage due to the gap between the adjacent balloons 200 when they are connected, so as to ensure the reliability of the use of this embodiment; specifically, the two corresponding first connection tubes 310 and the second connection 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 may also be produced in one piece by means of a mold, so as to improve the production efficiency of the present 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 arranged at the end of the inner tube 110 away from the balloon 200, so that the guide wire can remain straight and pass through the inner tube 110 from the first inlet 131, and then enter the patient's body, which is convenient for medical staff to quickly exchange different types of guide wires.

[0065] Specifically, the second inlet 132 of the catheter adapter 130 is opened at an angle to the first inlet 131, thereby reducing the interference effect on the opening of the inner tube 110 when the medium is introduced into the outer tube 120 through the second inlet 132, and facilitating the insertion of the guide wire into the inner tube 110 by medical personnel. Figure 6As shown, the first inlet 131 may also be disposed at the end of the outer tube 120 close to the side of the balloon 200. The advantage of this design is that balloon catheters of different specifications can be quickly replaced, thereby expanding the scope of application of this embodiment.

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

[0067] In some embodiments, the balloon 200 is made of nylon (PA) because it has high strength and low compliance, and is suitable for expansion in extremely narrow blood vessels. At the same time, nylon also has good thermal stability and chemical stability; of course, in other embodiments of the present invention, the balloon 200 can also be made of other materials such as polyethylene terephthalate, polyether block polyamide, polyurethane, etc., to ensure the normal expansion and contraction of the balloon 200.

[0068] In some embodiments, there are multiple second inlets 132 on the catheter seat 130, and the number of the second inlets 132 corresponds to the number of the balloons 200. A corresponding passage is formed with the balloon 200 through a multi-lumen catheter. The second inlets 132 are connected to the balloon 200 one-to-one through the corresponding passage, so that the corresponding balloon 200 can be driven to expand by introducing a medium into the corresponding second inlet 132, thereby realizing accurate control of multiple balloons 200.

[0069] The cross-sectional shape of the balloon 200 is as follows: Figure 7 As shown, this design is carefully planned to optimize the performance and effect of the balloon 200 in a specific medical application. Regarding the shape of the first groove 210, its design flexibility is reflected in a variety of possible forms to meet different usage requirements. Specifically, the first groove 210 can be designed to be composed of two circumscribed arcs. This shape is conducive to the smooth transition between the guide groove and the surrounding structure, reducing the resistance during the expansion or contraction of the balloon 200, and improving the smoothness of the overall operation.

[0070] In addition, the first groove 210 can also be selected to be a concave arc groove. This design not only conforms to the principles of fluid mechanics, but can also provide more uniform support when the balloon 200 is inflated. The area of ​​the circle is the largest when the cross-sectional circumference of the balloon 200 remains unchanged. This means that the concave arc groove is more likely to form a groove with a large volume, allowing more blood to flow through during expansion therapy.

[0071] In addition, in order to meet the needs of certain specific application scenarios, the first groove 210 can also be designed as a rectangular groove. The shape of the rectangular groove is simple and clear, easy to process and manufacture, and its geometric shape 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 use environment, functional requirements and manufacturing process of the balloon 200, and ensures the adaptability and reliability of the balloon 200 in different medical scenarios by providing a variety of optional forms.

[0073] Example 2

[0074] The present invention also provides a vasodilation device for penetrating and dilating blood vessels at diseased sites of patients as needed, including the balloon dilation catheter described in Example 1. The vasodilation device has all the beneficial effects of the balloon dilation catheter and will not be described in detail here.

[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0076] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A balloon dilatation catheter, characterized in that: include: an inner tube, wherein a guide wire is inserted into the inner tube; An outer tube, sleeved on the inner tube; A catheter seat, wherein the catheter seat is provided with a first inlet and a second inlet, wherein the first inlet is communicated with the inner tube, and the second inlet is communicated with the outer tube; A plurality of balloons are provided, each of which is sleeved on the end of the inner tube away from the catheter seat, and the interior of the balloon is connected to the outer tube; and a plurality of first grooves are evenly distributed on the side of the balloon.

2. The balloon dilatation catheter according to claim 1, characterized in that: The two end surfaces of the balloon perpendicular to the axis of the inner tube are provided with rounded corners, the rounded corners on the end surfaces of two adjacent balloons are spliced ​​to form a second groove, and the first groove and the second groove are butted to form a guide channel.

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

4. The balloon dilatation catheter according to claim 2, 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 diameter of the balloon.

5. The balloon dilatation catheter according to claim 1, characterized in that: An extending direction of the first groove is parallel to an axis of the inner tube.

6. The balloon dilatation catheter according to claim 5, characterized in that: The cross-sectional shape of the first groove is an inwardly concave arc groove, a rectangular groove, or a groove formed by splicing two circumscribed arcs.

7. The balloon dilatation catheter according to claim 5, 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.

8. The balloon dilatation catheter according to claim 1, characterized in that: The plurality of balloons are integrally formed by a mold or are connected and formed in sequence by connecting components.

9. The balloon dilatation catheter according to claim 1, characterized in that: There are multiple second inlets on the catheter seat, and the number of the second inlets corresponds to the number of the balloons. The outer tube is provided with passages corresponding to the balloons, and the second inlets are connected to the balloons through the corresponding passages.

10. A vasodilator device, characterized in that: Comprising the balloon dilatation catheter according to any one of claims 1 to 9.

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