Balloon catheter
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LIFETECH SCI (SHENZHEN) CO LTD
- Filing Date
- 2024-12-31
- Publication Date
- 2026-06-30
Smart Images
Figure CN122297883A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical device technology, and in particular to a balloon catheter. Background Technology
[0002] Interventional therapy is a rapidly developing emerging discipline that integrates imaging diagnosis and clinical treatment. It has now become one of the three pillars of clinical medicine, alongside traditional internal medicine and surgery. An aortic occlusion balloon is a medical consumable used to control and block blood flow, typically in surgical or emergency situations. Applications of aortic occlusion balloons include, but are not limited to: abdominal aortic balloon occlusion, resuscitation endovascular aortic balloon occlusion (REBOA), traumatic cardiac arrest prevention, and interventional closure of congenital heart disease.
[0003] Among these applications, abdominal aortic balloon occlusion is primarily used to reduce intraoperative bleeding and improve surgical safety. For example, during a cesarean section, a balloon catheter is inserted into the abdominal aorta via femoral artery puncture, and blood flow is blocked by inflating the balloon during the procedure, thereby reducing bleeding. Percutaneous aortic valve balloon occlusion: This is an interventional procedure used to treat aortic valve disease, improving clinical symptoms and survival rates by inflating the balloon. Resuscitation endovascular aortic balloon occlusion is used for early anti-shock treatment, by placing and inflating a balloon in the aorta to stop blood flow to distal sites while maintaining blood supply to vital organs. Prevention of traumatic cardiac arrest: Aortic balloon occlusion can serve as a life-saving measure, especially important in areas with limited medical resources. Interventional closure of congenital heart disease: In the treatment of some congenital heart diseases, balloons are used to close abnormal blood vessels or cardiac structures. These applications demonstrate the diverse uses of aortic occlusion balloons in various medical scenarios, from reducing surgical bleeding to emergency hemostasis and the treatment of cardiovascular diseases.
[0004] However, when using aortic occlusion balloons, potential risks must be considered, such as damage to distal organs caused by prolonged blood flow occlusion. When using existing occlusion balloons, if some blood flow needs to be released, the balloon will be deflated appropriately. However, after the balloon is deflated, there is no part of the balloon that fits against the blood vessel, which can easily lead to displacement or excessive blood flow. Summary of the Invention
[0005] To address the aforementioned shortcomings, this invention provides a balloon catheter.
[0006] This invention provides a balloon catheter, the balloon catheter comprising:
[0007] catheter;
[0008] A balloon is positioned at or near the distal end of the catheter.
[0009] A limiting member is provided on the outside of the balloon, and at least a portion of the limiting member is capable of radial movement or radial deformation to drive the balloon to move radially inward.
[0010] In the balloon catheter of this embodiment of the invention, when the limiting member drives the balloon to move radially inward, the coverage area of the limiting member on the balloon is less than 1 / 3 of the surface area of the balloon.
[0011] In the balloon catheter of this invention, the limiting element includes an elastic filament or a flexible thread; and / or, the balloon is a compliant balloon or a supercompliant balloon.
[0012] In the balloon catheter of this embodiment of the invention, after the balloon is inflated, at least a portion of the limiting member can move radially to drive at least a portion of the limiting member to move radially inward, thereby forming a liquid channel in the balloon, so that blood can flow through the liquid channel at both ends of the balloon; the liquid channel is straight; or, the liquid channel is curved.
[0013] In the balloon catheter of this embodiment of the invention, the balloon can form one or more liquid channels; the limiting member includes elastic wires, and the number of elastic wires is arranged in correspondence with the number of liquid channels.
[0014] In the balloon catheter of this invention, the limiting member includes an elastic wire, and the number of the elastic wires includes a plurality of elastic wires. The plurality of elastic wires enable the balloon to form a plurality of liquid channels, and each liquid channel is evenly spaced along the circumference of the balloon.
[0015] In the balloon catheter of this embodiment of the invention, the balloon catheter further includes:
[0016] The control mechanism includes a distal end of the limiting member connected to the distal end of the catheter, and the limiting member connected to the control mechanism. The control mechanism can drive the limiting member to move, so that the portion of the limiting member corresponding to the balloon can move or deform radially, thereby driving the balloon to move radially inward.
[0017] In the balloon catheter of this embodiment of the invention, the control mechanism includes:
[0018] Control components;
[0019] The movable component is connected to the control component and to the proximal end of the limiting component. The movable component can move along the axial direction of the catheter under the action of the control component, so that the movable component drives the limiting component to move, thereby enabling the portion of the limiting component corresponding to the balloon to move or deform radially, thereby driving the balloon to move radially inward.
[0020] In the balloon catheter of this embodiment of the invention, the control element includes a knob, which is threadedly connected to the movable element.
[0021] In the balloon catheter of this embodiment of the invention, the balloon catheter includes a control component and a movable component. The control component is provided with a first position mark, a second position mark, and a third position mark, which are sequentially arranged along the axial direction of the balloon catheter. When the movable component moves to the first position mark, the limiting component is in a non-tensioned state. When the movable component moves to the second position mark, the limiting component is in a first tensioned state. When the movable component moves to the third position mark, the limiting component is in a second tensioned state, and the first tensioned state is different from the second tensioned state.
[0022] The balloon catheter provided in this embodiment of the invention allows at least a portion of the limiting member to move radially, thereby driving the balloon to move radially inward. Therefore, the physician can adjust the limiting member to contact the balloon and deform it according to the actual situation. This ensures that a portion of the balloon remains firmly attached to the blood vessel, reducing the risk of balloon displacement and preventing the balloon from losing its function of dilating blood vessels or blocking aneurysms due to displacement, thus improving the stability and reliability of balloon implantation. Furthermore, it allows another portion of the balloon to no longer be tightly attached to the blood vessel wall, creating a gap to form a fluid channel, allowing a small amount of blood to flow between the two ends of the balloon. This ensures blood supply to distal organs, avoids organ necrosis or exacerbating damage caused by ischemia-reperfusion, reduces surgical complications, relieves pressure on patients and physicians, and increases the success rate of the surgery.
[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the disclosure of the embodiments of the present invention. Attached Figure Description
[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of the structure of a balloon catheter at an angle according to an embodiment of the present invention;
[0026] Figure 2 This is a schematic diagram of the balloon catheter provided in one embodiment of the present invention from another angle;
[0027] Figure 3 This is a schematic diagram of a balloon catheter located in a blood vessel according to an embodiment of the present invention;
[0028] Figure 4 This is a schematic diagram of the structure of a balloon catheter at an angle according to an embodiment of the present invention;
[0029] Figure 5 This is a schematic diagram of the balloon catheter provided in one embodiment of the present invention from another angle;
[0030] Figure 6 This is a partial structural diagram of a balloon catheter at one angle provided in an embodiment of the present invention;
[0031] Figure 7 This is a schematic diagram of the balloon catheter provided in one embodiment of the present invention from another angle;
[0032] Figure 8 This is a partial structural diagram of a balloon catheter at one angle provided in an embodiment of the present invention;
[0033] Figure 9 This is a schematic diagram of the balloon catheter provided in one embodiment of the present invention from another angle;
[0034] Figure 10 This is a schematic diagram of the structure of a balloon catheter provided in an embodiment of the present invention;
[0035] Figure 11 This is a partial schematic diagram of an angle of a balloon catheter provided in an embodiment of the present invention;
[0036] Figure 12 This is a schematic diagram of the structure of a balloon catheter provided in an embodiment of the present invention;
[0037] Figure 13 yes Figure 12 A partial schematic diagram;
[0038] Figure 14 This is a partial schematic diagram of an angle of a balloon catheter provided in an embodiment of the present invention;
[0039] Figure 15 This is a partial schematic diagram of an angle of a balloon catheter provided in an embodiment of the present invention;
[0040] Figure 16 This is a schematic diagram of the balloon catheter provided in one embodiment of the present invention from another angle.
[0041] Explanation of reference numerals in the attached figures:
[0042] 100. Balloon catheter;
[0043] 10. Catheter; 11. Fluid cavity; 12. Guidewire lumen;
[0044] 20. Balloon; 21. Fluid channel;
[0045] 30. Limiting component; 31. First part; 32. Second part;
[0046] 40. Injection seat; 50. Control mechanism; 51. Control component; 52. Moving component; 60. Guide tube seat;
[0047] 200, blood vessel; 300, aneurysm. Detailed Implementation
[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0049] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0050] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.
[0051] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.
[0052] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0053] It should be noted that for balloon catheters, the end of the balloon catheter closer to the operator is generally called the "proximal end," and the end farther from the operator is called the "distal end." The "proximal end" and "distal end" of any component of the balloon catheter are defined based on this principle. "Axial direction" generally refers to the length of the balloon catheter during delivery, while "radial direction" generally refers to the direction perpendicular to its "axial direction." The "axial direction" and "radial direction" of any component of the balloon catheter are defined based on this principle.
[0054] Please see Figures 1 to 3 This application provides a balloon catheter 100. The balloon catheter 100 can dilate narrowed sections within a conduit, such as a blood vessel 200, restoring the inner diameter of the blood vessel 200 to near-normal levels. The balloon catheter 100 can also seal ruptured aneurysms 300 within the blood vessel 200, i.e., stop the bleeding from the ruptured aneurysm 300. The blood vessel 200 may include at least one of the following: aortic arch, thoracic aorta, abdominal aorta, etc. Those skilled in the art should understand that the use of blood vessel 200 as an example is merely illustrative and not intended to limit the invention. The solutions of this invention are applicable to various human or animal conduits. Human conduits may include, for example, digestive tract conduits or blood vessels. Various improvements and modifications based on the teachings of this invention are within the protection scope of this invention.
[0055] Please see Figure 2 , Figure 4 and Figure 5 In some embodiments, the balloon catheter 100 includes a catheter 10, a balloon 20, and a limiting member 30. The balloon 20 is disposed at or near the distal end of the catheter 10. The limiting member 30 is disposed outside the balloon 20, and at least a portion of the limiting member 30 is capable of radial movement or radial deformation to drive the balloon 20 to move radially inward.
[0056] In the balloon catheter 100 of the above embodiment, after the balloon 20 is inflated and adheres to the blood vessel wall, the blood flow can be blocked, and the blood vessel 200 cannot supply blood to the distal organ. Since at least a portion of the limiting member 30 can move radially to drive the balloon 20 to move radially inward, the balloon 20 can form a liquid channel 21 while partially adhering to the blood vessel 200. This allows blood to flow between the two ends of the balloon 20 through the liquid channel 21. Thus, the balloon 20 can completely or partially block the blood flow in the blood vessel 200 according to actual needs, ensuring that blood can still flow in the blood vessel 200 while the balloon 20 expands the blood vessel 200 or achieves the blocking function. Specifically, doctors can adjust the positioning device 30 to contact the balloon 20 and deform the balloon 20 according to the actual situation. This allows a portion of the balloon 20 to remain firmly attached to the blood vessel 200, reducing the risk of balloon 20 displacement and preventing it from losing its function of dilating the blood vessel 200 or blocking the aneurysm 300 due to displacement, thus improving the stability and reliability of balloon 20 implantation. Simultaneously, another portion of the balloon 20 is no longer firmly attached to the blood vessel wall, leaving a gap to form a fluid channel 21. This allows a small amount of blood to flow between the two ends of the balloon 20, ensuring blood supply to distal organs, preventing organ necrosis or exacerbating damage caused by ischemia-reperfusion, reducing surgical complications, relieving pressure on patients and doctors, and increasing the success rate of the surgery.
[0057] Please see Figure 1 and Figure 2 Exemplarily, the balloon 20 is expandable and encloses an inner cavity (not shown). The catheter 10 is provided with a fluid cavity 11, which communicates with the inner cavity. The balloon catheter 100 also includes an infusion seat 40, to which the catheter 10 is connected. The connection between the catheter 10 and the infusion seat 40 can be, but is not limited to, at least one of the following: laser welding, thermoforming welding, or adhesive bonding. When a fluid such as gas or liquid is introduced into the fluid cavity 11 through the infusion seat 40, the fluid enters the inner cavity and creates inflation pressure, thereby inflating the balloon 20, increasing its volume and cross-sectional dimensions, ensuring that the balloon 20 can be effectively inflated, and providing a sealing or expansion function.
[0058] Please see Figure 2 For example, the catheter 10 also has a guidewire lumen 12, through which a guidewire can be inserted to guide the balloon 20 into the blood vessel 200. The guidewire lumen 12 is independent of the fluid lumen 11 and they are not connected to each other to prevent fluid in the fluid lumen 11 from leaking into the guidewire lumen 12. This facilitates efficient inflation of the balloon 20 and ensures that the balloon 20 can be stably maintained in a preset shape after inflation to achieve the expansion or occlusion function.
[0059] For example, balloon 20 is a compliant or supercompliant balloon, meaning it is made of compliant or supercompliant materials. Thus, once balloon 20 expands to a predetermined diameter and volume, its diameter and volume can continuously increase with increasing inflation pressure. Using compliant or supercompliant materials, balloon 20 can deform according to the shape of the blood vessel 200, ensuring good adhesion and allowing it to better adhere to the vessel 200. This prevents pressure buildup within the vessel 200, which could lead to blood leakage between the vessel 200 and balloon 20, achieving a good expansion or occlusion effect. Using compliant or supercompliant materials also reduces pressure on the vessel wall; when balloon 20 over-inflates, its shape changes, extending towards areas of lower resistance.
[0060] Specifically, the material of the balloon 20 can be at least one of polyurethane (PU), thermoplastic elastomer (TPE), and thermoplastic rubber (TPR). PU has better stability, chemical resistance, resilience, and mechanical properties, and exhibits less compression deformation; TPE and TPR, as thermoplastic structures, have superior physical properties and structural stability. Of course, the material of the balloon 20 is not limited to these; it can also be other compliant or supercompliant materials.
[0061] In other embodiments, the balloon 20 may also be a semi-compliant balloon, wherein once the balloon 20 expands to a predetermined diameter and volume, the increase in diameter and volume of the semi-compliant balloon is small as the inflation pressure continues to increase.
[0062] In some embodiments, when the limiting member 30 moves the balloon 20 radially inward, the coverage area of the limiting member 30 on the balloon 20 is less than 1 / 3 of the surface area of the balloon 20. Thus, when the limiting member 30 moves the balloon 20 radially inward, the balloon 20 has good compliance properties, allowing it to both partially adhere to the blood vessel 200 and easily form a fluid channel 21 to allow blood to flow between the two ends of the balloon 20.
[0063] In some embodiments, the limiting member 30 includes an elastic wire or a flexible thread. Thus, the limiting member 30 has a simple structure and is lightweight. For example, the limiting member 30 includes an elastic wire with good elasticity and elastic recovery capability, enabling the limiting member 30 to both drive the balloon 20 to move radially inward and smoothly return to a state where there is no interaction between the limiting member 30 and the balloon 20 when blood does not need to be connected at both ends of the balloon 20, thereby completely blocking blood flow within the blood vessel 200.
[0064] For example, the limiting member 30 includes an elastic wire, which may be a nickel-titanium alloy wire. Nickel-titanium alloy wire has good elasticity and strong elastic recovery ability, good plasticity, and long service life. In addition to having a unique shape memory function, it also has excellent characteristics such as wear resistance, corrosion resistance, high damping and superelasticity.
[0065] Please see Figure 2 , Figure 4 and Figure 5 In some embodiments, after the balloon 20 is inflated, at least a portion of the limiting member 30 is capable of radial movement to drive a portion of the balloon 20 radially inward, thereby forming a liquid channel 21 in the balloon 20, allowing blood to flow through the liquid channel 21 at both ends of the balloon 20. The shape of the liquid channel 21 can be any suitable shape. For example, please refer to... Figure 5 The liquid channel 21 is linear, and the limiting component 30 has a simple structure, making it easy and convenient to manufacture. For another example, please refer to... Figures 6 to 9 The fluid channel 21 is curved, and the blood flow is slower when flowing in the curved fluid channel 21, making it easier to control the blood flow.
[0066] The number of liquid channels 21 and limiting members 30 can be designed according to actual needs, and each can include one or more. For example, the balloon 20 can form one or more liquid channels 21; the limiting member 30 includes elastic wires, the number of which corresponds to the number of liquid channels 21. In this way, as many liquid channels 21 as possible can be formed with as few elastic wires as possible, and the structure of the balloon catheter 100 is simple. For example, please refer to... Figure 5 The number of elastic filaments includes two, and the number of liquid channels 21 includes two, with each elastic filament enabling the balloon 20 to form one liquid channel 21. See also... Figure 10 The number of elastic filaments includes three, and the number of liquid channels 21 includes three. Each elastic filament enables the balloon 20 to form a liquid channel 21.
[0067] Please see Figure 10In some embodiments, the number of elastic wires is multiple, enabling the balloon 20 to form multiple liquid channels 21, each liquid channel 21 being evenly spaced along the circumference of the balloon 20. Because the liquid channels 21 are evenly spaced along the circumference of the balloon 20, the scouring force or pressure exerted on the balloon 20 by the blood flow through the liquid channels 21 can be balanced as much as possible, thereby minimizing the probability of the balloon 20 shifting within the blood vessel 200. Furthermore, because the liquid channels 21 are evenly spaced along the circumference of the balloon 20, after the balloon 20 is inflated, it can deform more uniformly under the combined action of the multiple elastic wires, enabling the balloon 20 to form liquid channels 21 while also ensuring that a portion of the balloon 20 reliably adheres to the blood vessel 200, further reducing the risk of balloon shifting. In other embodiments, the liquid channels 21 may also be non-uniformly spaced along the circumference of the balloon 20.
[0068] Please see Figure 1 and Figure 11 In some embodiments, the balloon catheter 100 further includes a control mechanism 50. The distal end of the limiting member 30 is connected to the distal end of the catheter 10. The limiting member 30 is connected to the control mechanism 50, and the control mechanism 50 can drive the limiting member 30 to move, so that the portion of the limiting member 30 corresponding to the balloon 20 can move or deform radially, thereby driving the balloon 20 to move radially inward. After the balloon 20 is inflated, operating the control mechanism 50 can cause the limiting member 30 to apply force to the balloon 20, so that the portion of the balloon 20 in contact with the limiting member 30 moves radially inward. For example, after the balloon 30 is inflated or before it is not inflated, the distal end of the limiting member 30 is closer to the distal end of the balloon catheter 100 than the distal end of the balloon 20. The distal end of the limiting member 30 is connected to the distal end of the catheter 10, including at least one of the following situations: the distal end of the limiting member 30 is connected to the distal end of the catheter 10; the distal end of the limiting member 30 is connected to a region of the catheter 10 near the distal end.
[0069] Please see Figure 11In some embodiments, the control mechanism 50 includes a control element 51 and a movable element 52. The movable element 52 is tractively connected to the control element 51 and connected to the proximal end of the limiting element 30. The movable element 52 can move along the axial direction of the catheter 10 under the action of the control element 51, so that the movable element 52 drives the limiting element 30 to move, thereby allowing the portion of the limiting element 30 corresponding to the balloon 20 to move radially or deform radially, thereby driving the balloon 20 to move radially inward. In this way, the doctor can operate the control element 51 according to the actual situation, so that the limiting element 30 drives the balloon 20 to move and the portion of the balloon 20 in contact with the limiting element 30 moves radially inward. A part of the balloon 20 can still be tightly attached to the blood vessel 200, reducing the risk of balloon 20 displacement; another part of the balloon 20 is no longer tightly attached to the blood vessel wall, leaving a gap, allowing a small amount of blood flow to circulate at both ends of the balloon 20, ensuring blood supply to distal organs, reducing surgical complications, relieving pressure on patients and doctors, and increasing the success rate of surgery.
[0070] Please see Figure 11 In some embodiments, the control element 51 includes a knob, which is threadedly connected to the movable element 52. Thus, rotating the knob allows the movable element 52 to move axially along the conduit 10, thereby moving the limiting element 30. This causes the limiting element 30 to move the portion of the balloon 20 in contact with the limiting element 30 radially inward. Furthermore, because the knob is threadedly connected to the movable element 52, the movable element 52 can be reliably locked at any position within the threaded connection area between the knob and the movable element 52. This eliminates the need for an additional locking mechanism, ensuring the relative position between the limiting element 30 and the balloon 20 is maintained at the desired position, making operation convenient and easy to control.
[0071] In other embodiments, the control mechanism 50 can also be any other suitable structure. For example, the connection method between the control element 51 and the movable element 52 includes at least one of the following: integral molding connection, adhesive connection, etc. The control element 51 can move along the axial direction of the conduit 10 to drive the movable element 52 to move along the axial direction of the conduit 10, thereby causing the limiting element 30 to drive the portion of the balloon 20 in contact with the limiting element 30 to move radially inward. Alternatively, one of the control element 51 and the movable element 52 can be omitted.
[0072] Please see Figure 2 and Figure 5 For example, the limiting member 30 has a non-tensioned state and a tensioned state. Figure 2 As shown, when the limiting member 30 is in a non-tensioned state, the limiting member 30 does not apply radial force to the balloon 20, and the balloon 20 does not form a liquid channel 21; as Figure 5As shown, when the limiting member 30 is in the tensioned state, it applies radial force to the balloon 20, forming a liquid channel 21 within the balloon 20. By operating the control member 51, the limiting member 30 can be switched between a non-tensioned state and a tensioned state. The tensioned state can include one, two, or more. When there are at least two tensioned states, the cross-sectional area of the liquid channel 21 differs for each tensioned state. Thus, the limiting member 30 can be controlled to the desired tensioned state according to actual needs, thereby controlling the cross-sectional area of the liquid channel 21 to meet the requirements of different application scenarios. The non-tensioned state can include one, two, or more, without limitation.
[0073] Please see Figure 12 For example, the elastic wire includes a first portion 31 and a second portion 32, the first portion 31 and the second portion 32 are connected, the first portion 31 is disposed outside the balloon 20, the distal end of the first portion 31 is connected to the catheter 10, the first portion 31 is used to contact the balloon 20 to drive the portion of the balloon 20 in contact with the first portion 31 to move inward; the second portion 32 extends from the proximal end of the first portion 31 to the proximal end of the catheter 10.
[0074] Please see Figure 11 , Figures 13 to 16 In some embodiments, the balloon catheter 100 includes a control element 51 and a movable element 52. The control element 51 is provided with a first position indicator 511, a second position indicator 512, and a third position indicator 513, which are sequentially arranged along the axial direction of the balloon catheter 100. When the movable element 52 moves to the first position indicator 511, the limiting element 30 is in a non-tensioned state; when the movable element 52 moves to the second position indicator, the limiting element 30 is in a first tensioned state; when the movable element 52 moves to the third position indicator, the limiting element 30 is in a second tensioned state. The first tensioned state is different from the second tensioned state. Thus, the operator can quickly and accurately switch the limiting element 30 to the desired state simply by operating the control element 51, which facilitates precise adjustment of the state of the limiting element 30 according to actual needs and helps improve the success rate of the surgery. For example, when the limiting member 30 is in a non-tensioned state, the limiting member 30 does not apply radial force to the balloon 20, and the balloon 20 does not form a liquid channel 21; when the limiting member 30 is in a first tensioned state and a second tensioned state, the balloon 20 can form a liquid channel 21 in both states, and the cross-sectional area of the liquid channel 21 formed in the first tensioned state is larger than the cross-sectional area of the liquid channel 21 formed in the second tensioned state. For example, when the movable member 52 moves to such a position... Figure 11 When in the position shown, the limiting member 30 is in a non-tensioned state, and the shape of the balloon 20 is as follows. Figure 2 As shown. When the moving part 52 moves to the position shown... Figure 14When the position shown is such that the limiting member 30 is in the first tensioned state, the shape of the balloon 20 is as follows: Figure 5 As shown. When the moving part 52 moves to the position shown... Figure 15 As shown, the limiting member 30 is in the second tensioned state, and the shape of the balloon 20 is as follows. Figure 16 As shown.
[0075] Please see Figure 12 In some embodiments, the balloon catheter 100 further includes a catheter seat 60, which is connected to the proximal end of the catheter 10. The catheter seat 60 can serve as a functional interface and has at least one of the following functions: for connecting a hemostatic valve, for adding contrast agent, for allowing guidewire entry, etc.
[0076] In use, the balloon catheter 100 of this embodiment can inflate the supercompliant balloon 20 to fit the blood vessel wall according to actual needs, thus blocking blood flow and preventing blood from flowing to distal organs. Then, the doctor can operate a rotating knob to move the movable component 52 from the proximal end to the distal end, thereby pulling the elastic wire fixed to the movable component 52. This causes the elastic wire to tighten, compressing the already inflated supercompliant balloon 20 and causing it to deform. Part of the balloon 20 is no longer tightly attached to the blood vessel wall, leaving a gap that allows a small amount of blood to flow to the distal organ, ensuring blood supply to the distal organ. This also reduces the risk of balloon 20 displacement, reduces surgical complications, reduces pressure on both the patient and the doctor, and increases the success rate of the surgery.
[0077] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," "mechanical coupling," and "coupling" 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 can refer to the internal communication of two components or the interaction between two components. Mechanical coupling or coupling of two components includes direct coupling and indirect coupling, such as a direct fixed connection or a connection through a transmission mechanism. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0078] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0079] The foregoing disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described above. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.
[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific method step, feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific method steps, features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0081] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A balloon catheter, characterized by, The balloon catheter includes: catheter; A balloon is positioned at or near the distal end of the catheter. A limiting member is provided on the outside of the balloon, and at least a portion of the limiting member is capable of radial movement or radial deformation to drive the balloon to move radially inward.
2. The balloon catheter of claim 1, wherein, When the limiting member drives the balloon to move radially inward, the coverage area of the limiting member on the balloon is less than 1 / 3 of the surface area of the balloon.
3. The balloon catheter of claim 1, wherein, The limiting element includes an elastic filament or a flexible thread; and / or, the balloon is a compliant balloon or a supercompliant balloon.
4. The balloon catheter according to claim 1, characterized in that, After the balloon is inflated, at least a portion of the limiting member can move radially to drive a portion of the balloon to move radially inward, thereby forming a liquid channel in the balloon, allowing blood to flow through the liquid channel to both ends of the balloon; the liquid channel is straight; or, the liquid channel is curved.
5. The balloon catheter according to claim 4, characterized in that, The balloon can form one or more liquid channels; the limiting member includes elastic wires, and the number of elastic wires is set in accordance with the number of liquid channels.
6. The balloon catheter according to claim 4, characterized in that, The limiting member includes elastic wires, and the number of elastic wires includes multiple elastic wires. The multiple elastic wires enable the balloon to form multiple liquid channels, and each liquid channel is evenly spaced along the circumference of the balloon.
7. The balloon catheter according to claim 1, characterized in that, The balloon catheter also includes: The control mechanism includes a distal end of the limiting member connected to the distal end of the catheter, and the limiting member connected to the control mechanism. The control mechanism can drive the limiting member to move, so that the portion of the limiting member corresponding to the balloon can move or deform radially, thereby driving the balloon to move radially inward.
8. The balloon catheter according to claim 7, characterized in that, The control mechanism includes: Control components; The movable component is connected to the control component and to the proximal end of the limiting component. The movable component can move along the axial direction of the catheter under the action of the control component, so that the movable component drives the limiting component to move, thereby enabling the portion of the limiting component corresponding to the balloon to move or deform radially, thereby driving the balloon to move radially inward.
9. The balloon catheter according to claim 8, characterized in that, The control component includes a knob, which is threadedly connected to the movable component.
10. The balloon catheter according to claim 1, characterized in that, The balloon catheter includes a control component and a movable component. The control component has a first position indicator, a second position indicator, and a third position indicator, which are sequentially arranged along the axial direction of the balloon catheter. When the movable component moves to the first position indicator, the limiting component is in a non-tensioned state. When the movable component moves to the second position indicator, the limiting component is in a first tensioned state. When the movable component moves to the third position indicator, the limiting component is in a second tensioned state. The first tensioned state and the second tensioned state are different.