Balloon catheter
Patent Information
- Application Number
- CN202522533443.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-28
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-11-28
Smart Images
Figure CN224925197U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of interventional surgical instruments, specifically to a balloon catheter. Background Technology
[0002] Atrial septal defect (ASD), ventricular septal defect (VSD), and patent foramen ovale (PFO) are common congenital heart diseases, and interventional closure is the mainstream treatment method. In interventional closure surgery, accurate preoperative measurement of the defect size is crucial for selecting the appropriate occluder. Currently, the balloon measurement method is commonly used clinically. This involves placing a balloon at the defect site under ultrasound guidance and inflating it. By observing whether the balloon completely blocks the atrial shunt (i.e., the "blood flow cutoff" phenomenon), it is determined whether the balloon is completely aligned with the defect edge, thereby assessing the defect size.
[0003] However, in current congenital heart defect closure procedures, balloon inflation measurement relies on X-ray observation of the "lumbar sign," followed by echocardiography (the gold standard) to assess the fit. This step-by-step approach has two major problems: first, dynamic inflation and ultrasound monitoring are difficult to synchronize in real time, making the procedure complex and time-consuming; second, the step-by-step assessment has a lag, easily leading to insufficient balloon inflation requiring repeated adjustments, or over-inflation causing damage to the defect tissue. Current technology lacks a means to simultaneously provide feedback on the balloon fit under X-ray visualization, urgently requiring an auxiliary method that can preliminarily predict the "blood flow cutoff" phenomenon to reduce operative cycles and lower the surgical risks associated with over-inflation. Utility Model Content
[0004] This application provides a new balloon catheter to facilitate the prediction of "blood flow cutoff phenomenon", thereby reducing intraoperative operation cycles and lowering the surgical risks caused by overfilling.
[0005] One embodiment provides a balloon catheter, comprising:
[0006] catheter;
[0007] A balloon, disposed in the catheter, the balloon being collapsible and inflatable, including a contact segment for contacting tissue structures at the defect site;
[0008] A balloon infusion channel is disposed within the catheter and communicates with the internal cavity of the balloon for infusing a medium into the balloon.
[0009] And a proximal contrast channel, located within the catheter, for delivering contrast agent;
[0010] The proximal angiography channel includes at least one proximal angiography port disposed in the wall of the catheter, the proximal angiography port being located on the proximal outer side of the balloon and configured to allow contrast agent to be sprayed into the contact segment.
[0011] In one embodiment, the exit direction of the proximal angiography port is toward the balloon, and the exit direction forms an exit angle α with the axis of the catheter, wherein the exit angle α is an acute angle.
[0012] In one embodiment, the emission angle α ranges from 10 degrees to 70 degrees.
[0013] In one embodiment, the balloon further includes a first conical transition section disposed at the proximal end of the balloon and adjacent to the contact section.
[0014] In one embodiment, a cone angle β is formed between the generatrix of the first tapered transition section and the axis of the conduit, and the exit angle α is smaller than the cone angle β.
[0015] In one embodiment, the balloon infusion channel includes at least one balloon infusion hole disposed on the wall of the catheter, and the balloon infusion channel communicates with the internal cavity of the balloon through the balloon infusion hole;
[0016] The balloon infusion port includes a first balloon infusion port, which is located near the proximal end of the first tapered transition section of the balloon.
[0017] and / or;
[0018] The balloon also includes a second conical transition section, which is disposed at the distal end of the balloon;
[0019] The balloon infusion port includes a second balloon infusion port, which is located at the distal end of the second conical transition section near the balloon.
[0020] In one embodiment, the balloon infusion channel includes a balloon infusion port, the cross-sectional area of which is larger than the cross-sectional area of the infusion channel;
[0021] Alternatively, the balloon infusion channel may include at least two balloon infusion holes, the sum of the cross-sectional areas of each balloon infusion hole being greater than the cross-sectional area of the infusion channel.
[0022] In one embodiment, the number of proximal angiography holes is multiple;
[0023] The plurality of proximal angiography ports are distributed along the axial direction of the catheter; and / or, the plurality of proximal angiography ports are distributed along the circumferential direction of the catheter.
[0024] In one embodiment, among the plurality of proximal angiography holes, at least two of the proximal angiography holes have a difference in the exit angle α corresponding to their exit directions.
[0025] In one embodiment, the catheter is further provided with a guidewire insertion channel for inserting a guidewire.
[0026] The balloon catheter further includes an interface component connected to the catheter, comprising:
[0027] The balloon infusion interface is connected to the balloon infusion channel and is used to connect the media input device for media input.
[0028] The proximal angiography interface is connected to the proximal angiography channel and is used to connect to the contrast agent input device for contrast agent input.
[0029] And a threading interface, which is connected to the threading channel, for inserting the guide wire.
[0030] According to the balloon catheter of the above embodiment, by setting a proximal angiography port on the proximal side of the balloon and configuring it to spray contrast agent into the contact segment of the balloon, combined with DSA (digital subtraction angiography) technology, it is possible to directly and dynamically observe whether the flow of contrast agent from the proximal end of the balloon through the defect to the distal end of the balloon is blocked by the contact segment of the balloon, thus forming an intuitive "contrast agent cutoff" phenomenon. This makes it easier for the surgeon to make a preliminary prediction of the "blood flow cutoff" phenomenon, which helps to overcome the limitations of over-reliance on ultrasound in related technologies, avoid the difficulty of judging ultrasound images due to interference from factors such as patient position, obesity, and lung gas, and facilitates reducing operation cycles and reducing the surgical risks caused by over-inflation.
[0031] The higher spatial resolution and contrast of DSA improve the accuracy and reliability of balloon occlusion assessment, providing a solid basis for precise selection of occluder models to reduce surgical risks and costs. It also reduces reliance on advanced ultrasound techniques and experience, shortens the learning curve, helps surgeons standardize measurements, and improves surgical success rates in complex anatomy or when ultrasound images are poor. Attached Figure Description
[0032] Figure 1 This is a schematic diagram of a balloon catheter according to one embodiment, wherein the balloon is in an inflated state;
[0033] Figure 2 This is a schematic diagram of the structure of the distal portion of a balloon catheter according to one embodiment;
[0034] Figure 3 This is a schematic diagram of the proximal angiography port portion in one embodiment.
[0035] In the diagram, 10 is the catheter; 11 is the balloon infusion channel; 111 is the balloon infusion port; 1111 is the first balloon infusion port; 1112 is the second balloon infusion port; 12 is the proximal angiography channel; 121 is the proximal angiography port; and 13 is the wire-passing channel. 20. Balloon; 21. Contact section; 22. First conical transition section; 23. Second conical transition section; 30. Interface component; 31. Balloon infusion interface; 32. Proximal angiography interface; 33. Wire threading interface. Detailed Implementation
[0036] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.
[0037] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.
[0038] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).
[0039] The terms "proximal" and "distal" used in this article are conventional medical terms. For the instrument to be operated on, the proximal end is the end closer to the operator, and the distal end is the end furthest from the operator; it is usually the end that enters the patient's body first. For more information on proximal and distal ends, please refer to [link to relevant documentation]. Figure 1 The displayed location.
[0040] In this embodiment, by setting a proximal angiography port 121 on the wall of the catheter 10, located on the proximal side of the balloon 20 and configured to spray contrast agent into the contact segment 21 of the balloon 20, combined with DSA (digital subtraction angiography) technology, it is possible to directly and dynamically observe whether the flow of contrast agent from the proximal end of the balloon 20 through the defect to the distal end of the balloon 20 is blocked by the contact segment 21 of the balloon 20, thus forming an intuitive "contrast agent cutoff" phenomenon. This facilitates the surgeon's preliminary prediction of the "blood flow cutoff" phenomenon, overcoming the limitations of ultrasound dependence in related technologies and solving the problem of ultrasound image interference from factors such as patient position and obesity. This facilitates reducing operation cycles and surgical risks caused by over-inflation. Furthermore, the higher spatial resolution and contrast of DSA improve the accuracy and reliability of judging the balloon 20's contact status, providing a solid basis for the precise selection of the occluder model to reduce surgical risks and costs. At the same time, it reduces the dependence on high-level ultrasound technology and experience, shortens the operation learning curve, helps the surgeon to complete measurements in a standardized manner, and improves the success rate of surgery in complex anatomical scenarios.
[0041] In one embodiment, please refer to Figures 1 to 3 The balloon catheter includes a catheter 10, a balloon 20, a balloon infusion channel 11, and a proximal angiography channel 12.
[0042] Please refer to Figure 1 The catheter 10 can be a medical-grade hollow tubular structure, adapted to the vascular access path of interventional closure surgeries such as atrial septal defects, and can meet the basic functional requirements of guidewire insertion, filling medium perfusion, and contrast agent delivery during the procedure. The balloon 20 is placed in a predetermined area of the catheter 10, such as the distal end of the catheter 10. The balloon 20 can be made of medical-grade elastic polymer material, with the characteristics of being collapsible and inflatable. In the collapsed state, it can smoothly pass through the human vascular cavity to reach the atrial septal defect site. In the inflated state, it can contact the tissue structure at the defect site to complete the dimensional measurement.
[0043] The balloon 20 is provided with a contact section 21 for contacting the tissue structure at the defect site. The contact section 21 can be understood as the core area that fits with the edge of the defect after the balloon 20 is inflated. The shape of the contact section 21 is adapted to the anatomical structure of the atrial septal defect. For example, it can be set as a cylindrical structure to ensure the accuracy of measurement during fitting.
[0044] The balloon infusion channel 11 is located in the internal cavity of the catheter 10 and is connected to the internal cavity of the balloon 20. Through the balloon infusion channel 11, physiological saline, contrast agent diluent and other filling media can be infused into the internal cavity of the balloon 20 to achieve precise control of the inflation degree of the balloon 20.
[0045] Please refer to Figure 2 and Figure 3The proximal angiography channel 12 is independently located within the internal cavity of the catheter 10 and is dedicated to delivering contrast agent. The proximal angiography channel 12 includes at least one proximal angiography port 121 formed in the wall of the catheter 10. The proximal angiography port 121 is located on the proximal outer side of the balloon 20, spaced apart from the proximal end of the balloon 20. The exit direction of the proximal angiography port 121 is configured to spray the contrast agent towards the contact segment 21 of the balloon 20, so that the contrast agent directly reaches the contact segment 21 of the balloon 20 and the area where it aligns with the atrial septal defect. During defect measurement, the operator can observe the defect via DSA imaging. Whether the contrast agent flows through the defect, i.e. whether a "contrast agent cutoff" phenomenon is formed, can be used to preliminarily predict whether a "blood flow cutoff" phenomenon is formed. This allows us to determine whether the contact segment 21 of the balloon 20 is completely attached to the edge of the defect, replacing the traditional method of judging blood flow signals under ultrasound guidance. This not only makes it easier to reduce operation cycles, reduce the subjectivity of operation and the surgical risks caused by over-inflation, but also helps to shorten the operation learning curve, reduce the difficulty of coordinating dynamic inflation and monitoring, help the surgeon to complete the measurement in a standardized manner, and improve the success rate of surgery in scenarios such as complex anatomy or poor ultrasound images.
[0046] In one embodiment, please refer to Figure 2 and Figure 3 The proximal angiography port 121 exits towards the balloon 20, forming an exit angle α with the axis of the catheter 10. This exit angle α is acute (i.e., α < 90°). Designing the exit angle α as acute prevents the contrast agent from being sprayed away from the balloon 20, ensuring the contrast agent stream is precisely directed towards the contact segment 21 of the balloon 20. This concentrates the contrast agent in the area where the contact segment 21 of the balloon 20 meets the defect tissue, improving the targeting and clarity of contrast agent imaging under DSA, and facilitating the operator's quick and accurate assessment of the balloon 20's fit. For example, when the exit angle α is acute, the contrast agent, after exiting from the proximal angiography port 121, will not be sprayed radially along the catheter 10, but will deflect towards the balloon 20, directly covering the contact area between the contact segment 21 of the balloon 20 and the defect, preventing the contrast agent from diffusing into non-target areas and causing imaging interference.
[0047] In one embodiment, the exit angle α between the exit direction of the proximal contrast port 121 and the axis of the catheter 10 ranges from 10° to 70°. This is to ensure that the contrast agent's jet trajectory can maximally cover the contact section 21 of the balloon 20, while avoiding situations where the contrast agent stream is too close to the catheter 10 and unable to diffuse to the contact section 21 due to an excessively small angle, or where the contrast agent stream deviates from the contact section 21 due to an excessively large angle. For example, the exit angle α can be 10°, 20°, 30°, 45°, 60°, or 70°, etc.
[0048] In one embodiment, please refer to Figure 2The balloon 20 also includes a first conical transition section 22, which is located at the proximal end of the balloon 20 and is adjacent to the contact section 21 of the balloon 20. The first conical transition section 22 creates a gradually tapered structure at the proximal end of the balloon 20. This tapered transition structure guides the contrast agent stream to extend more smoothly from the proximal region to the contact section 21, facilitating its alignment with the exit angle of the proximal contrast port 121. This prevents the contrast agent from being blocked by the right angle or stepped structure of the balloon 20, ensuring that the contrast agent effectively reaches the contact section 21 and the area where the defect is located.
[0049] In one embodiment, please refer to Figure 3 The generatrix of the first conical transition section 22 forms a cone angle β with the axis of the catheter 10, and the exit angle α of the proximal contrast port 121 is smaller than the cone angle β. Since there is a gap between the proximal contrast port 121 and the proximal end of the balloon 20, setting the exit angle α to be smaller than the cone angle β ensures that after the contrast agent jet is ejected from the proximal contrast port 121, it smoothly passes through the outer region of the first conical transition section 22 and is sprayed onto the contact section 21 of the balloon 20. This helps to avoid the contrast agent jet hitting the balloon wall of the first conical transition section 22 and rebounding or failing to enter the coverage area of the contact section 21, thus improving the imaging effectiveness.
[0050] In one embodiment, please refer to Figure 1 and Figure 2 The balloon infusion channel 11 includes at least one balloon infusion port 111 formed in the wall of the catheter 10. The balloon infusion channel 11 communicates with the internal cavity of the balloon 20 through the balloon infusion port 111. The balloon infusion port 111 includes a first balloon infusion port 1111, which is positioned near the proximal end of the first conical transition section 22. Positioning the first balloon infusion port 1111 near the proximal end of the first conical transition section 22 allows for a more thorough emptying of the balloon 20 before use. For example, when using the fluid-filled emptying method, the balloon 20 can be held vertically, allowing the air inside to concentrate in the proximal portion and be fully expelled through the first balloon infusion port 1111. This facilitates complete emptying and contraction of the balloon 20, ensuring its smooth entry into the body via interventional procedures, while also preventing residual air from affecting measurement accuracy.
[0051] In one embodiment, please refer to Figure 1 and Figure 2The balloon 20 also includes a second conical transition section 23, which is located at the distal end of the balloon 20. The second conical transition section 23 can also be adjacent to the contact section 21 of the balloon 20. The balloon infusion port 111 includes a second balloon infusion port 1112, which is positioned near the distal end of the balloon 20, corresponding to the second conical transition section 23. The second conical transition section 23 creates a gradually tapered structure at the distal end of the balloon 20. The second balloon infusion port 1112 and the first balloon infusion port 1111 form the infusion structure at both ends of the balloon 20. The medium can be simultaneously infused or expelled from both the proximal and distal ends of the balloon 20, making the inflation and collapse process of the balloon 20 more uniform and efficient. This helps avoid irregularities caused by localized residual medium in the balloon 20, ensuring the fitting accuracy between the contact section 21 of the balloon 20 and the defect edge, and further improving measurement accuracy.
[0052] To facilitate the infusion of the balloon 20 with the filling medium, the total cross-sectional area of the balloon infusion orifices 111 can be greater than the cross-sectional area of the infusion channel 11, thus avoiding excessive restrictions on the infusion flow rate / volume of the filling medium imposed by the specifications of the balloon infusion orifices 111. That is, in some embodiments, if the balloon infusion channel 11 includes only one balloon infusion orifice 111 (such as a first balloon infusion orifice 1111 or a second balloon infusion orifice 1112), then the cross-sectional area of that balloon infusion orifice 111 is greater than the cross-sectional area of the infusion channel 11. In other embodiments, if the balloon infusion channel 11 includes at least two balloon infusion orifices 111 (such as a first balloon infusion orifice 1111 and a second balloon infusion orifice 1112), then the sum of the cross-sectional areas of all the balloon infusion orifices 111 is greater than the cross-sectional area of the infusion channel 11.
[0053] In one embodiment (not shown), the number of proximal angiography holes 121 can be multiple. These holes can be distributed along the axial direction of the catheter 10, or along the circumference of the catheter 10, or simultaneously along both directions. Distributing multiple proximal angiography holes 121 along the axial direction of the catheter 10 can cover areas at different axial positions of the proximal end of the balloon 20, adapting to changes in the position of the contact segment 21 of the balloon 20 under different inflation levels. Distributing multiple proximal angiography holes 121 along the circumference of the catheter 10 allows the contrast agent to be sprayed onto the contact segment 21 of the balloon 20 from multiple circumferential angles, improving the uniformity of contrast agent coverage around the contact segment 21 and avoiding contrast blind spots caused by deviations in the angle of a single angiography hole. For example, two proximal angiography holes 121 can be provided along the axial direction of the catheter 10, corresponding to... Figure 1 The image shows the left and right positions proximal to the balloon 20. Two proximal angiography ports 121 are also provided circumferentially around the catheter 10, corresponding to... Figure 1 The upper and lower positions of the balloon 20 near the proximal end, as shown in the view, form a multi-directional contrast agent spray structure to ensure that the fit between the contact section 21 and the defect is displayed without any blind spots under DSA.
[0054] It is understood that when multiple proximal angiography ports 121 are distributed along the axial direction of the catheter 10, the proximal angiography channel 12 can be constructed as a straight channel arranged along the axial direction of the catheter 10 to communicate with each proximal angiography port 121. When multiple proximal angiography ports 121 are distributed along the circumferential direction of the catheter 10, the proximal angiography channel 12 may include multiple sub-channels, which extend within the catheter 10 and correspondingly connect to each proximal angiography port 121, and the multiple sub-channels converge at the proximal end of the catheter 10.
[0055] In a further embodiment, when there are multiple proximal angiography ports 121, the emission angles α corresponding to the emission directions of at least two proximal angiography ports 121 have a difference, that is, the angles between the emission directions of at least two proximal angiography ports 121 and the axis of the catheter 10 are different. For example, the emission angles α corresponding to the emission directions of each proximal angiography port 121 can be arranged in a stepped distribution. Since the position of the contact segment 21 may slightly shift due to factors such as the anatomical shape of the defect and the degree of inflation of the balloon 20 during the actual inflation process of the balloon 20, proximal angiography ports 121 with different emission angles can eject contrast agent jets with different trajectories, ensuring that at least one jet accurately covers the contact segment 21 and the area where it contacts the defect, which helps improve the tolerance and adaptability of the balloon catheter in different usage scenarios.
[0056] In one embodiment, please refer to Figure 1 and Figure 2 The catheter 10 also has a guidewire insertion channel 13 inside for inserting a guidewire. The guidewire insertion channel 13 can be an independent hollow channel that runs through the entire length of the catheter 10. The inner diameter of the guidewire insertion channel 13 is adapted to the outer diameter of guidewires commonly used in interventional surgery, ensuring that the guidewire can be inserted smoothly and providing guidance and support for the intraoperative positioning and advancement of the balloon catheter. In some embodiments, the balloon infusion channel 11 and the proximal angiography channel 12 can both be located around the guidewire insertion channel 13.
[0057] In one embodiment, please refer to Figure 1 The balloon catheter also includes an interface component 30, which is connected to the catheter 10, such as the proximal end of the catheter 10. The interface component 30 includes a balloon infusion interface 31, a proximal angiography interface 32, and a guidewire insertion interface 33. The balloon infusion interface 31 communicates with the balloon infusion channel 11 and can be connected to a media input device such as a syringe or infusion pump for inflation media input. The proximal angiography interface 32 communicates with the proximal angiography channel 12 and can be connected to a contrast agent input device such as a contrast agent injector or a high-pressure injector for contrast agent input. The guidewire insertion interface 33 communicates with the guidewire insertion channel 13 and is specifically used for guidewire insertion. The guidewire insertion interface 33 can be arranged along the axial direction of the guidewire insertion channel 13, which helps to reduce bending during guidewire insertion and facilitates guidewire insertion. The integrated interface component 30 allows the surgeon to quickly distinguish and operate different functional interfaces during the operation, improving the convenience and efficiency of the surgical procedure.
[0058] It should be noted that the above embodiments, which describe the balloon catheter in conjunction with atrial septal defect detection, are only intended to clearly illustrate the inventive concept of the balloon catheter in this application and do not constitute a limitation on the balloon catheter. In other words, the application scenarios of the balloon catheter in this application are not limited to atrial septal defect detection. It can also be applied to defect detection such as patent ductus arteriosus, ventricular septal defect, and patent foramen ovale; preoperative measurement of pulmonary artery diameter during pulmonary valve implantation; preoperative measurement of vessel diameter at the implantation site during inferior vena cava filter implantation; and other scenarios requiring measurement of the treatment site during the diagnosis and treatment of peripheral vessels. Specific scenarios will not be elaborated here.
[0059] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the ideas presented.
Claims
1. A balloon catheter, characterized in that, include: catheter; A balloon, disposed in the catheter, the balloon being collapsible and inflatable, including a contact segment for contacting tissue structures at the defect site; A balloon infusion channel is disposed within the catheter and communicates with the internal cavity of the balloon for infusing a medium into the balloon. And a proximal contrast channel, located within the catheter, for delivering contrast agent; The proximal angiography channel includes at least one proximal angiography port disposed in the wall of the catheter, the proximal angiography port being located on the proximal outer side of the balloon and configured to allow contrast agent to be sprayed into the contact segment.
2. The balloon catheter as described in claim 1, characterized in that, The proximal angiography port has an exit direction toward the balloon, and the exit direction forms an exit angle α with the axis of the catheter, wherein the exit angle α is an acute angle.
3. The balloon catheter as described in claim 2, characterized in that, The range of the emission angle α is 10 degrees to 70 degrees.
4. The balloon catheter as described in claim 2, characterized in that, The balloon also includes a first conical transition section, which is disposed at the proximal end of the balloon and adjacent to the contact section.
5. The balloon catheter as described in claim 4, characterized in that, The generatrix of the first tapered transition section forms a cone angle β with the axis of the conduit, and the exit angle α is smaller than the cone angle β.
6. The balloon catheter as described in claim 4, characterized in that, The balloon infusion channel includes at least one balloon infusion hole disposed on the wall of the catheter, and the balloon infusion channel communicates with the internal cavity of the balloon through the balloon infusion hole; The balloon infusion port includes a first balloon infusion port, which is located near the proximal end of the first tapered transition section of the balloon. and / or; The balloon also includes a second conical transition section, which is disposed within the balloon. remote; The balloon infusion port includes a second balloon infusion port, which is located at the distal end of the second conical transition section near the balloon.
7. The balloon catheter as described in claim 6, characterized in that, The balloon infusion channel includes a balloon infusion port, the cross-sectional area of which is larger than the cross-sectional area of the infusion channel; Alternatively, the balloon infusion channel may include at least two balloon infusion holes, the sum of the cross-sectional areas of each balloon infusion hole being greater than the cross-sectional area of the infusion channel.
8. The balloon catheter according to any one of claims 2 to 7, characterized in that, The number of proximal angiography ports is multiple; The plurality of proximal angiography ports are distributed along the axial direction of the catheter; and / or, the plurality of proximal angiography ports are distributed along the circumferential direction of the catheter.
9. The balloon catheter as described in claim 8, characterized in that, Among the plurality of proximal angiography ports, at least two of the proximal angiography ports have a difference in the exit angle α corresponding to their exit directions.
10. The balloon catheter according to any one of claims 1 to 7, characterized in that, The catheter also has a threading channel inside for threading a guidewire; The balloon catheter further includes an interface component connected to the catheter, comprising: The balloon infusion interface is connected to the balloon infusion channel and is used to connect the media input device for media input. The proximal angiography interface is connected to the proximal angiography channel and is used to connect to the contrast agent input device for contrast agent input. And a threading interface, which is connected to the threading channel, for inserting the guide wire.