Balloon catheter

Abstract

The application discloses a balloon catheter, which comprises a tube assembly and a first balloon, wherein the surface of the tube assembly is provided with a first flow guide opening and a second flow guide opening; the surface of the first balloon is provided with perfusion holes; the first flow guide opening and the second flow guide opening are located inside a first filling cavity to extrude air in the first filling cavity along the perfusion holes by liquid circulation flow. When the number of perfusion holes on the surface of the first balloon is small, the liquid inflow is greater than the liquid outflow, which is beneficial to the filling of the liquid in the balloon and the discharge of the internal air, but the air exhaust efficiency is relatively low. With the continuous injection of liquid, the internal pressure of the balloon increases, at this time, the second flow guide opening can be used for liquid outflow to guide part of the liquid out of the balloon, thereby avoiding the damage of the balloon caused by excessive pressure. If the number of perfusion holes is large, the liquid outflow may be greater than the liquid inflow, which affects the filling of the liquid in the balloon and causes the air to be difficult to discharge. At this time, the second flow guide opening can be used for liquid inflow to increase the liquid inflow and promote the discharge of the air in the balloon.

Description

Technical Field

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

[0002] Infusion balloon catheters are commonly used devices for treating severe stenosis or occlusion of blood vessels caused by atherosclerosis and other conditions. However, due to the complex internal structure of the infusion lumen, if air is not completely expelled before use, residual gas may enter the bloodstream during the procedure due to balloon inflation or pressure changes, forming an air embolism and potentially causing serious clinical complications. Utility Model Content

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a balloon catheter capable of expelling air from the balloon catheter through circulating fluid.

[0004] According to a first aspect embodiment of the present application, the balloon catheter includes a tube body assembly and a first balloon. The surface of the tube body assembly is provided with a first flow port and a second flow port. The hollow first balloon is sleeved on the tube body assembly and defines a first filling cavity on the outer periphery of the tube body assembly. The surface of the first balloon is provided with an infusion hole communicating with the first filling cavity. The first filling cavity of the first balloon is connected to the outside through the infusion hole. The first flow port and the second flow port are located inside the first filling cavity. The first flow port is used to guide liquid into the first filling cavity, and the second flow port is used to guide liquid out or into the first filling cavity, so that the air in the first filling cavity is squeezed out of the first filling cavity along the infusion hole through the liquid circulation.

[0005] The balloon catheter according to the embodiments of this application has at least the following beneficial effects: When the number of infusion holes on the surface of the first balloon is small, the inflow volume exceeds the outflow volume, which is beneficial for the inflation of the balloon and the expulsion of internal air, but the air venting efficiency is relatively low. As liquid is continuously injected, the internal pressure of the balloon increases. At this time, the second guide port can be used for liquid outflow, thereby exporting some liquid and avoiding balloon damage due to excessive pressure. If the number of infusion holes is large, the outflow volume may exceed the inflow volume, affecting the inflation of the balloon and making it difficult to expel air. In this case, the second guide port can be used for liquid inflow, thereby increasing the inflow volume and promoting the expulsion of air from the balloon.

[0006] According to some embodiments of this application, the first flow guide and the second flow guide are located on opposite sides of the first filling cavity along the axial direction of the tube assembly, and the injection hole and the second flow guide are located on the same side of the first filling cavity.

[0007] According to some embodiments of this application, the balloon catheter further includes a second balloon, which is spaced apart from the first balloon. The hollow second balloon is sleeved on the tube assembly and defines a second filling cavity on the outer periphery of the tube assembly. The surface of the tube assembly is provided with a first filling port, which is located inside the second filling cavity and communicates with the second filling cavity.

[0008] According to some embodiments of this application, the first drainage port is located on the side of the first filling cavity away from the second balloon, and the second drainage port and the infusion hole are located on the side of the first filling cavity close to the second balloon.

[0009] According to some embodiments of this application, the tube assembly includes a first tube, the first tube having a first inlet for introducing liquid into the second filling chamber, the interior of the first tube having a first filling channel, and the first inlet communicating with the first filling port through the first filling channel.

[0010] According to some embodiments of this application, the first tube body is provided with a second inlet, the second inlet is used to place the guidewire of the balloon catheter, and the interior of the first tube body is provided with a guidewire channel, the guidewire channel penetrates the first tube body and communicates with the second inlet.

[0011] According to some embodiments of this application, the tube assembly further includes a second tube, which is sleeved outside the first tube. The second tube has a third inlet for introducing liquid into the first filling cavity. The interior of the second tube has a liquid inlet channel, and the third inlet is connected to the first guide port through the liquid inlet channel.

[0012] According to some embodiments of this application, the second tube body is provided with an inlet and outlet for discharging or introducing liquid into the first filling cavity, and the interior of the second tube body is provided with a liquid channel, and the inlet and outlet are connected to the second guide port through the liquid channel.

[0013] According to some embodiments of this application, the balloon catheter further includes a third balloon disposed inside the first balloon and defining a third filling cavity on the outer periphery of the tube assembly. The surface of the tube assembly is provided with a second filling port communicating with the third filling cavity, and the second filling port is used to guide liquid into the third filling cavity.

[0014] According to some embodiments of this application, the balloon catheter further includes a first protective sleeve that covers the outside of the folded first balloon, the first protective sleeve being made of a blood-soluble material.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] The present application will be further illustrated below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments illustrated in the following drawings are exemplary and are only used to explain the present application, and should not be construed as limiting the present application.

[0017] Figure 1 This is a schematic diagram of the structure of the balloon catheter according to an embodiment of this application; Figure 2 This is a cross-sectional view of the first tube body in the balloon catheter of this application embodiment; Figure 3 This is a cross-sectional view of the first and second tubes after the second tube is sleeved on the first tube in the balloon catheter of this application embodiment; Figure 4 This is a schematic diagram of the structure of the balloon catheter after the third balloon is installed in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of the balloon catheter after the first and second protective sleeves are installed according to an embodiment of this application.

[0018] Figure label: 101. The first tube body; 102. The second tube body; 201. Second balloon; 202. First inlet; 203. First inflation channel; 204. Second inflation cavity; 205. First inflation port; 206. Second inlet; 207. Guidewire channel; 301. First balloon; 302. Infusion port; 303. Third inlet; 304. First filling chamber; 305. Liquid inlet channel; 306. First guide port; 307. Inlet / outlet; 308. Liquid channel; 309. Second guide port; 401. Third balloon; 402. Third filling chamber; 403. Second filling port; 501. First protective sleeve; 502. Second protective sleeve; 503. Developing layer. Detailed Implementation

[0019] The embodiments of this application are described in detail below with reference to 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 this application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be understood that the terms "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0021] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] In the description of this application, the use of terms such as "one embodiment," "some embodiments," "an example," "some instances," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. 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.

[0024] This application provides a balloon catheter, which includes a tubing assembly and a first balloon 301. The balloon catheter of this application delivers medication to the patient's affected area via the first balloon 301. Furthermore, the first balloon 301 is disposed within the tubing assembly; when the tubing assembly enters the patient's blood vessel, it also carries the first balloon 301 into the patient's blood vessel. It is understood that if the first balloon 301 used for delivering medication contains air, air can easily be introduced into the blood vessel during medication delivery; therefore, the air inside the first balloon 301 must be purged before the balloon catheter is used.

[0025] In the prior art, air is expelled from the first balloon 301 by drawing negative pressure in the atmosphere or in a liquid. When drawing negative pressure to expel air in the atmosphere, because the surface of the first balloon 301 needs to be provided with an infusion hole 302 for infusing the drug solution, air from the atmosphere will still enter the first balloon 301 along the infusion hole 302, making it difficult to completely expel the air from the first balloon 301. When drawing negative pressure to expel air in a liquid, as the balloon catheter is removed from the liquid and brought into the atmosphere, air will also enter the first balloon 301 along the infusion hole 302, making it difficult to completely expel the air from the first balloon 301.

[0026] Therefore, this application employs a liquid circulation method to expel the air from the first balloon 301, ensuring the effective air expulsion of the first balloon 301. Specifically, liquid circulates into and out of the first balloon 301, and during this circulation process, the gas inside the first balloon 301 is continuously squeezed out of the first balloon 301 until the first balloon 301 is completely emptied of air.

[0027] It is worth noting that this application uses liquid circulation to allow air inside the first balloon 301 to be discharged through the infusion holes 302. Therefore, when the number of infusion holes 302 on the surface of the first balloon 301 is small, it is easier to ensure that the inflow of liquid into the first balloon 301 is greater than the outflow, thus filling the first balloon 301 with liquid and facilitating the discharge of air. However, due to the small number of infusion holes 302, the air discharge efficiency of the first balloon 301 is low. The liquid injected into the first balloon 301 needs to have a relatively high pressure to discharge air, and there is a risk of excessive pressure inside the first balloon 301, which could even lead to rupture. In this case, this application provides an additional liquid outlet structure inside the first balloon 301 to alleviate the pressure on the first balloon 301.

[0028] Similarly, when there are a large number of infusion holes 302 on the surface of the first balloon 301, the outflow rate of the first balloon 301 may be greater than the inflow rate. In this case, it is difficult to fill the first balloon 301 with liquid through injection, and the air inside the first balloon 301 cannot be emptied. In this situation, the present application provides an additional liquid inflow structure inside the first balloon 301 to improve the liquid inflow capacity of the first balloon 301, so that the inflow volume of the first balloon 301 is greater than the outflow volume of the infusion holes 302, which facilitates the filling of the first balloon 301 with liquid and the expulsion of the air inside the first balloon 301.

[0029] Specifically, a second flow port 309 is provided inside the first balloon 301, which can be used for both fluid discharge and fluid inlet. When the number of infusion holes 302 on the surface of the first balloon 301 is small, the second flow port 309 serves an additional function of fluid discharge; when the number of infusion holes 302 on the surface of the first balloon 301 is large, the second flow port 309 serves an additional function of fluid inlet. The second flow port 309 can ensure that the first balloon 301 efficiently discharges air and ensures the effect of air evacuation, thereby improving the adaptability of the tubing components in the balloon catheter of this application.

[0030] The contents of this application are described in detail below with reference to specific embodiments. It should be noted that the following description is merely illustrative and not a specific limitation of this application.

[0031] like Figure 1 As shown, in some examples, the balloon catheter includes a tube body assembly and a first balloon 301. The surface of the tube body assembly is provided with a first inlet 306 and a second inlet 309. The first inlet 306 is used for fluid inlet, while the second inlet 309 is used for fluid inlet or outlet. When the number of infusion holes 302 on the surface of the first balloon 301 is small, the second inlet 309 functions as an outlet; when the number of infusion holes 302 on the surface of the first balloon 301 is large, the second inlet 309 functions as an inlet.

[0032] Furthermore, the first balloon 301 is hollow and is fitted around the outer periphery of the tube assembly, thereby forming a first filling cavity 304 around the outer periphery of the tube assembly. Simultaneously, the surface of the first balloon 301 is also provided with an infusion port 302. The first filling cavity 304 of the first balloon 301 communicates with the outside through the infusion port 302, allowing the medication inside the first balloon 301 to reach the patient's affected area along the infusion port 302 for treatment.

[0033] Specifically, during the process of air expulsion from the first balloon 301, external saline solution continuously enters the first balloon 301. As the liquid continuously occupies the first filling cavity 304, the air originally inside the first filling cavity 304 is expelled. Understandably, the air expelled during this process is exited from the first balloon 301 along the infusion port 302. When the first filling cavity 304 contains a certain amount of liquid, the liquid can be exited from the first filling cavity 304 along the second guide port 309 and / or the infusion port 302. When the liquid introduction and exit processes occur simultaneously, the liquid inside the first balloon 301 forms a circulating flow, thereby continuously expelling the air from the first filling cavity 304 until all the air in the first filling cavity 304 is expelled.

[0034] Simultaneously, during the perfusion process, the drug enters the first filling cavity 304 along the first inlet 306 and / or the second inlet 309, and then reaches the affected area from the first filling cavity 304 along the perfusion port 302. Drugs that inhibit vascular endothelial growth, such as lenvatinib or statins, can be used for perfusion to reduce the proliferation of vascular smooth muscle cells, thereby inhibiting the growth of the abdominal aortic aneurysm.

[0035] It is understandable that, in order to ensure that the liquid can act on the first filling cavity 304 through the first guide port 306 and the second guide port 309, both the first guide port 306 and the second guide port 309 are located inside the first filling cavity 304.

[0036] In some examples, the flow area of ​​the second guide port 309 is significantly smaller than that of the first guide port 306. For instance, the flow area of ​​the second guide port 309 is 1 / 4 to 1 / 2 of that of the first guide port 306. This ensures that the flow rate of liquid entering the balloon is greater than the flow rate of liquid exiting the balloon, thereby creating and maintaining a stable back pressure inside the balloon that is higher than the external environment. This back pressure provides the necessary power for the liquid to flow fully within the balloon to completely replace and expel the gas. Furthermore, by limiting the maximum pressure relief rate of the liquid, the pressure inside the balloon can be constrained within a safe range, effectively preventing balloon collapse due to excessively low pressure and balloon damage due to excessively high pressure. Thus, complete gas expulsion and balloon structural protection are achieved simultaneously.

[0037] In some examples, where the second guide port 309 is used for liquid discharge, in order to prevent the liquid entering the first filling cavity 304 along the first guide port 306 from being directly discharged from the first filling cavity 304 along the second guide port 309 before filling the first filling cavity 304, the first guide port 306 and the second guide port 309 are spaced apart, so that the liquid is discharged from the first filling cavity 304 along the second guide port 309 after filling the first filling cavity 304.

[0038] Specifically, the first flow guide 306 and the second flow guide 309 are located on opposite sides of the first filling cavity 304 along the axial direction of the tube assembly.

[0039] Furthermore, the infusion port 302 also needs to be located away from the first guide port 306 to prevent liquid entering the first filling cavity 304 along the first guide port 306 from being directly discharged from the first filling cavity 304 through the infusion port 302 before filling the first filling cavity 304 is filled. Therefore, the infusion port 302 and the second guide port 309 are located on the same side of the first filling cavity 304 to ensure a sufficiently large distance between the first guide port 306 and the infusion port 302. It is understandable that when there are many infusion ports 302, the positions of each infusion port 302 may be distributed throughout the entire first balloon 301. In this case, it is not necessary to restrict the infusion ports 302 to be far away from the first guide port 306.

[0040] like Figure 1 As shown, in some examples, the balloon catheter also includes a second balloon 201, which is spaced apart from the first balloon 301. When the second balloon 201 and the first balloon 301 expand in the blood vessel, the second balloon 201 can block blood flow, creating a relatively closed space between them, facilitating the infiltration of medication into the affected area within this space. Specifically, of the second balloon 201 and the first balloon 301, the first balloon 301 is closer to the operator, and the second balloon 201 is further away from the operator.

[0041] Furthermore, the second balloon 201 is hollow and fitted onto the tubing assembly, thus defining a second filling cavity 204 around the outer periphery of the tubing assembly. Understandably, when the second balloon 201 blocks blood flow by expansion, the volume of the second filling cavity 204 needs to increase. To control the volume of the second filling cavity 204, the surface of the tubing assembly is provided with a first filling port 205. The first filling port 205 is located inside and communicates with the second filling cavity 204, allowing liquid to enter the second filling cavity 204 under the guidance of the first filling port 205, thereby increasing the volume of the second filling cavity 204.

[0042] In some examples, since the target location that the drug solution needs to reach is between the first balloon 301 and the second balloon 201, the infusion port 302 needs to face the space between the first balloon 301 and the second balloon 201.

[0043] In some examples, the target location where the drug solution needs to reach is the contact position between the first balloon 301 and the tumor blood vessel wall. For example, along the length of the first balloon 301, several infusion holes 302 are opened in its circumferential direction to accurately deliver the drug to the tumor.

[0044] Specifically, the infusion port 302 is located on the side of the first inflation cavity 304 closer to the second balloon 201. Since the infusion port 302 and the second drainage port 309 are located on the same side of the first inflation cavity 304, and the first drainage port 306 and the second drainage port 309 are located on opposite sides of the first inflation cavity 304, the second drainage port 309 is also located on the side of the first inflation cavity 304 closer to the second balloon 201. However, the first drainage port 306 is located on the side of the first inflation cavity 304 away from the second balloon 201.

[0045] like Figure 1 and Figure 2 As shown, in some examples, the tube assembly includes a first tube 101 with a first inlet 202 located at the end of the tube assembly closer to the operator, allowing the operator to introduce fluid into the second filling cavity 204 along the first inlet 202, thereby causing the second balloon 201 to expand to block blood flow.

[0046] Furthermore, the first tube 101 has a first filling channel 203 inside, and the first inlet 202 is connected to the first filling port 205 through the first filling channel 203. During the expansion of the second balloon 201, the liquid enters the first filling channel 203 from the first inlet 202, reaches the first filling port 205, and is then introduced into the second filling chamber 204 from the first filling port 205.

[0047] In some examples, the first tube body 101 is provided with a second inlet 206, which is located at the end of the tube body assembly closer to the operator, facilitating the operator to place a guidewire along the second inlet 206. It is understood that the guidewire is used to guide the balloon catheter of this application into a blood vessel.

[0048] Furthermore, the first tube body 101 has a guidewire channel 207 inside, which penetrates the first tube body 101. Specifically, the guidewire channel 207 penetrates both the end of the balloon catheter closest to the operator and the end furthest from the operator. It can be understood that the guidewire channel 207 connects to the second inlet 206. During the insertion of the guidewire into the first tube body 101, the guidewire is inserted into the guidewire channel 207 from the second inlet 206 and penetrates the first tube body 101.

[0049] As can be seen, the first tube 101 has at least two mutually isolated cavities inside, which are used for introducing liquid and setting guide wires respectively. Since the cavities are spaced apart from each other, the operation of the guide wire and the process of introducing liquid are carried out relatively independently.

[0050] like Figure 1 and Figure 3As shown, in some examples, the tubing assembly further includes a second tubing 102, which is fitted over the first tubing 101. The second tubing 102 has a third inlet 303 located at the end of the tubing assembly closer to the surgeon, allowing the surgeon to introduce liquid or medication for venting into the first filling cavity 304 through the third inlet 303, thereby completing the venting or infusion of medication into the first balloon 301.

[0051] Furthermore, the second tube 102 is provided with a liquid inlet channel 305, and the third inlet 303 is connected to the first guide port 306 through the liquid inlet channel 305. During the liquid inlet process of the first balloon 301, the liquid enters the liquid inlet channel 305 from the third inlet 303, reaches the first guide port 306, and is then introduced into the first filling chamber 304 from the first guide port 306.

[0052] In some examples, the second tube 102 is also provided with an inlet / outlet 307, which is located at the end of the tube assembly closer to the surgeon, so that liquid can be introduced or exported from the end closer to the surgeon during the degassing of the first balloon 301.

[0053] Furthermore, the second tube 102 has a liquid channel 308 inside, and the inlet / outlet 307 is connected to the second guide port 309 through the liquid channel 308. When the number of infusion holes 302 on the surface of the first balloon 301 is small, the second guide port 309 functions as a liquid outlet, with the liquid first entering the liquid channel 308 along the second guide port 309, and then finally exiting the balloon catheter from the inlet / outlet 307. When the number of infusion holes 302 on the surface of the first balloon 301 is large, the second guide port 309 functions as a liquid inlet, with the liquid entering the liquid channel 308 from the inlet / outlet 307, and then entering the first balloon 301 from the second guide port 309.

[0054] As can be seen, the interior of the second tube 102 is provided with at least three mutually isolated cavities, two of which correspond to the first guide port 306 and the second guide port 309 respectively, and the other cavity is used to accommodate the first tube 101. Since the cavities are spaced apart from each other, the first guide port 306 and the second guide port 309 independently perform the guiding work.

[0055] like Figure 4 As shown, in some examples, the balloon catheter further includes a third balloon 401 disposed inside the first balloon 301 and forming a third filling cavity 402 around the outer periphery of the tube assembly. It is understood that the third filling cavity 402 is located inside the first filling cavity 304.

[0056] The third filling chamber 402, filled with liquid, occupies the internal space of the first filling chamber 304. When the first balloon 301 deflates, only a small amount of liquid needs to be introduced into the first filling chamber 304 to fill it, thus completing the deflation. Furthermore, when the first balloon 301 infuses medication into the affected area, only a small amount of medication needs to be introduced into the first filling chamber 304 to ensure the medication flows to the affected area. Therefore, the design of the third balloon 401 and the third filling chamber 402 conserves medication and the liquid used for deflation.

[0057] It is understood that the surface of the tube assembly may be additionally provided with a second filling port 403 that connects to the third filling chamber 402 and is used to guide liquid into the third filling chamber 402.

[0058] like Figure 5 As shown, in some examples, because this application uses liquid circulation to expel air from the first balloon 301, after the air in the first balloon 301 is expelled, the first balloon 301 is still full of liquid, making it difficult to enter the blood vessel. At this time, it is necessary to aspirate most of the liquid in the first balloon 301, thereby reducing the volume of the first balloon 301. However, a small amount of liquid will still remain inside the first balloon 301, ensuring that this small amount of liquid occupies the space inside the first balloon 301. In principle, the small amount of liquid inside the first balloon 301 can prevent air from the external environment from entering the interior of the first balloon 301 through the infusion port 302, thus preventing air from entering the interior of the first balloon 301.

[0059] However, during the process of extracting liquid from the first balloon 301, it is difficult to strictly prevent air from entering the first balloon 301 along the infusion port 302. Therefore, in actual operation, the operator can squeeze the first balloon 301 by hand to expel some of the liquid inside. The position and pressure of the hand are easier to control, which is more conducive to preventing air from entering the first balloon 301. Understandably, during the hand squeezing process, the liquid inside the first balloon 301 can be discharged through the first guide port 306 and / or the second guide port 309.

[0060] Furthermore, the balloon catheter also includes a first protective sleeve 501 and a second protective sleeve 502. When the volume of the first balloon 301 decreases, the first balloon 301 needs to be folded. To ensure that the first balloon 301 maintains a small volume, the first protective sleeve 501 covers the outside of the folded first balloon 301 to facilitate the entry of the first balloon 301 into the patient's blood vessel. Similarly, the second balloon 201 also needs to reduce its volume to enter the patient's blood vessel, and the second protective sleeve 502 covers the outside of the folded second balloon 201.

[0061] Specifically, the first protective sleeve 501 and the second protective sleeve 502 are made of blood-soluble materials, such as polyethylene glycol, polylactic acid-glycolic acid copolymer, etc. When the balloon catheter enters the blood vessel, the first protective sleeve 501 and the second protective sleeve 502 gradually dissolve into the blood, which facilitates the expansion of the volume of each balloon, thereby enabling it to perform its function.

[0062] In some examples, the tube assembly includes a contrast layer 503 for human angiography. The contrast layer 503 is located inside the first balloon 301 and the second balloon 201.

[0063] In addition, the shape of each balloon in this application can be set according to actual needs, such as using a cone-shaped balloon, a step-shaped balloon, etc.

[0064] In actual implementation, when the number of infusion holes 302 on the surface of the first balloon 301 is small, the inflow of liquid into the first balloon 301 is greater than the outflow, which facilitates the filling of the first balloon 301 with liquid and helps to expel the air inside the first balloon 301. However, the efficiency of air expulsion from the first balloon 301 is relatively low. As liquid enters the first balloon 301, the pressure inside the first balloon 301 becomes relatively high. At this time, the second guide port 309 acts as an outlet, allowing some liquid to be discharged from the first balloon 301 along the second guide port 309, preventing damage to the first balloon 301 due to the high pressure inside the first balloon 301. When the number of infusion holes 302 on the surface of the first balloon 301 is large, the outflow of liquid from the first balloon 301 is likely to exceed the inflow, which is not conducive to filling the first balloon 301 with liquid and makes it difficult to expel the air inside the first balloon 301. At this time, the second guide port 309 acts as an inlet, increasing the inflow of liquid into the first balloon 301 and facilitating the expulsion of air from the first balloon 301. After the air inside the first balloon 301 is expelled, the operator manually squeezes the balloon to release some of the liquid. This manual squeezing helps control the pressure point and intensity on the first balloon 301, while retaining some liquid inside to prevent air from re-entering. After the volume of the first balloon 301 is reduced by manual squeezing, a first protective sleeve 501 is placed over its outer surface to maintain its volume, facilitating its insertion into the patient's blood vessels.

[0065] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A balloon catheter, characterized in that, include: A tube assembly, wherein the surface of the tube assembly is provided with a first flow guide port and a second flow guide port; The first balloon, which is hollow, is sleeved on the tube assembly and defines a first inflation cavity on the outer periphery of the tube assembly. The surface of the first balloon is provided with an infusion hole that communicates with the first inflation cavity. The first inflation cavity of the first balloon communicates with the outside through the infusion hole. The first guide port and the second guide port are located inside the first filling cavity. The first guide port is used to guide liquid into the first filling cavity, and the second guide port is used to guide liquid out of or into the first filling cavity, so that the air in the first filling cavity is squeezed out of the first filling cavity along the injection hole through the liquid circulation flow.

2. The balloon catheter according to claim 1, characterized in that, The first flow guide port and the second flow guide port are located on opposite sides of the first filling cavity along the axial direction of the tube assembly, and the injection hole and the second flow guide port are located on the same side of the first filling cavity.

3. The balloon catheter according to claim 2, characterized in that, The balloon catheter further includes a second balloon, which is spaced apart from the first balloon. The hollow second balloon is sleeved on the tube assembly and defines a second filling cavity on the outer periphery of the tube assembly. The surface of the tube assembly is provided with a first filling port, which is located inside the second filling cavity and communicates with the second filling cavity.

4. The balloon catheter according to claim 3, characterized in that, The first drainage port is located on the side of the first filling cavity away from the second balloon, and the second drainage port and the infusion port are located on the side of the first filling cavity closer to the second balloon.

5. The balloon catheter according to claim 3, characterized in that, The tube assembly includes a first tube, which has a first inlet for introducing liquid into the second filling chamber. The first tube has a first filling channel inside, and the first inlet is connected to the first filling port through the first filling channel.

6. The balloon catheter according to claim 5, characterized in that, The first tube body is provided with a second inlet, which is used to place the guidewire of the balloon catheter. The first tube body is provided with a guidewire channel inside, which passes through the first tube body and is connected to the second inlet.

7. The balloon catheter according to claim 5, characterized in that, The tube assembly also includes a second tube, which is sleeved outside the first tube. The second tube has a third inlet for introducing liquid into the first filling cavity. The interior of the second tube has a liquid inlet channel, and the third inlet is connected to the first guide port through the liquid inlet channel.

8. The balloon catheter according to claim 7, characterized in that, The second tube is provided with an inlet and outlet for discharging or introducing liquid into the first filling cavity. The interior of the second tube is provided with a liquid channel, and the inlet and outlet are connected to the second guide port through the liquid channel.

9. The balloon catheter according to claim 1, characterized in that, The balloon catheter further includes a third balloon disposed inside the first balloon and defining a third filling cavity on the outer periphery of the tube assembly. The surface of the tube assembly is provided with a second filling port communicating with the third filling cavity. The second filling port is used to guide liquid into the third filling cavity.

10. The balloon catheter according to claim 3, characterized in that, The balloon catheter also includes a first protective sleeve that covers the outside of the folded first balloon, and the first protective sleeve is made of a blood-soluble material.

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