A catheter for interventional liver cancer surgery via the radial artery approach

Abstract

This invention belongs to the field of medical device technology. Addressing the problems of poor catheter support and safety hazards in current catheters, this invention provides a novel catheter for interventional liver cancer surgery via the radial artery approach, comprising multiple sequentially connected catheter segments. Each catheter segment includes an elastic tube, and a support body and a restraint mechanism disposed within the elastic tube, with the support body and restraint mechanism connected. The support body in this invention provides axial and radial support to both ends of the elastic tube. At the vascular bend in the catheter segment, the internal restraint mechanism, when compressed by the vessel wall, causes a change in the volume of its internally packed, deformable components, thereby deforming the support body and reducing its internal support strength. This reduces the overall rigidity of the catheter segment at the vascular bend, allowing the catheter segment to conform to the lateral curvature of the vessel. Simultaneously, the deformed support body provides axial support to the elastic tube, preventing occlusion of the elastic tube lumen at the vascular bend.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a catheter for interventional liver cancer surgery via the radial artery approach. Background Technology

[0002] Transarterial chemoembolization (TACE) is a common interventional procedure for treating intermediate-to-advanced liver cancer. Chemotherapy drugs and embolic agents are injected directly into the tumor's blood vessels via a catheter. This process cuts off the tumor's blood supply and nutrition, causing ischemia and necrosis. Compared to the traditional femoral artery approach, transradial approach liver cancer interventional surgery offers greater patient comfort post-surgery, allowing patients to get out of bed immediately and maintain independent living, thus avoiding the need for bed rest and is widely used.

[0003] Patent CN223366063U discloses a novel catheter for interventional liver cancer surgery via the radial artery approach. The catheter includes a tube body with an injection head connected to one end and an insertion head connected to the other. A hollow septum is formed inside the tube wall, and an air injection tube is located within the hollow septum. A support tube is connected to one side of the injection head, and the support tube is connected to the air injection tube through a connecting hole. When the catheter moves, an air bladder can be squeezed by hand, causing air inside the bladder to be injected into the hollow septum through the support tube. Because the septum is divided by a septum ring, the support tube fills the space sequentially from the space closest to the insertion head. When the air in each space is saturated, the air compresses the fan-shaped diaphragm of the conical septum, causing it to open and form a passage to fill the next space. The injection of gas into the hollow septum provides support to the catheter body, preventing excessive twisting or bending during its movement within the blood vessel.

[0004] The aforementioned technical solution uses a septum to divide the hollow septum into multiple inflatable chambers. The inflatable balloon can only inflate each chamber sequentially, preventing doctors from selectively supporting a particular segment. Therefore, inflating the chambers at the bends in the blood vessel increases the catheter's bending stiffness, making it unable to conform to the lateral curvature of the blood vessel. Excessive pressure on the blood vessel can damage it, posing a safety hazard. Furthermore, the inflation of each chamber relies on the conical diaphragm, and the chambers near the balloon only open when the pressure is too high. This means that when the balloon inflation pressure is too high, the proximal chambers will over-inflate; when the balloon inflation pressure is insufficient, the distal chambers will fail to inflate due to insufficient pressure. Consequently, the support force distribution throughout the catheter is uneven, resulting in poor support performance. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems of poor support effect and safety hazards of existing catheters.

[0006] To achieve the above objectives, the technical approach of this invention is as follows: A novel catheter for interventional hepatocellular carcinoma surgery via the radial artery approach is provided, comprising multiple catheter segments connected sequentially. Each catheter segment includes an elastic tube, and a support body and a restraint mechanism disposed within the elastic tube, wherein the support body and the restraint mechanism are connected. The support body in this invention provides axial and radial support to both ends of the elastic tube, improving the bending strength of the elastic tube and preventing bending deformation. Furthermore, in the catheter segment at the vascular bend, the internal restraint mechanism, when compressed by the vascular wall, causes a change in the volume of its internally filled compressible deformation component (e.g., hydrogel or aerogel). This volume change causes deformation of the support body, reducing its internal support and thus lowering the overall rigidity of the catheter segment at the vascular bend. This allows the catheter segment at this location to conform to the lateral bending of the blood vessel. Simultaneously, the deformed support body provides axial support to the elastic tube, preventing occlusion of the elastic tube lumen at the vascular bend.

[0007] Based on the above technical concept, the technical solution adopted by this invention is as follows: A catheter for interventional hepatocellular carcinoma surgery via the radial artery approach, comprising multiple sequentially connected catheter segments; each catheter segment includes: The elastic tube has a double-layer structure, with elastic membranes at both ends inside, and each elastic membrane and the inner wall of the elastic tube form an installation cavity; The support body is located inside the elastic tube, with both ends located in the mounting cavity on the same side; The restraint mechanism is located inside the elastic tube, with both ends located in the mounting cavity on the same side and connected to the support.

[0008] In the above technical solution, the constraint mechanism preferably includes: A tubular capsule is positioned at the center of an elastic tube and is pre-filled with a pressure-deformable component. Two constraint components are respectively set in the corresponding mounting cavities and connected to the tubular capsule.

[0009] Further limitations on the above technical solution include the following constraining components: Multiple constraint capsules are arranged in a circular pattern at equal intervals within the corresponding mounting cavity, and the interior of the constraint capsules is pre-filled with a pressure-induced volume deformation component. Multiple connecting tubes, one end of each connecting tube is connected to the corresponding constraint capsule, and the other end passes through the elastic membrane and is connected to the tubular capsule.

[0010] Further specifying the above technical solution, the support body includes: Multiple radial support ribs are sleeved with the cylindrical bladder body, with both ends located in the mounting cavity on the same side; Two axial support units are located in their respective mounting cavities, and each axial support unit is connected to the end of the constraint assembly and the radial support rib on the same side.

[0011] Further defining the above technical solution, the axial support unit includes multiple equally spaced arc-shaped support rods arranged circumferentially. The arc-shaped support rods are intersected with the constraint capsule, and both ends of each arc-shaped support rod are connected to the corresponding constraint capsule. The center of each arc-shaped support rod is connected to the end of the corresponding radial support rib.

[0012] To further define the above technical solution, the radial support ribs are inclinedly arranged inside the elastic tube.

[0013] To further define the above technical solution, the elastic membrane is a circular sheet structure.

[0014] Beneficial effects: I. This invention employs a combined design of multiple catheter segments so that the bending strength of the catheter segment located at the vascular bend automatically changes during catheter movement, while the strength of the catheter segments at other locations remains unchanged. In other words, the catheter in this application can adaptively reduce the bending strength of key nodes according to the vascular direction without damaging the vascular wall. The overall device has high safety in use, and the adaptive change in strength of the catheter segment at the vascular bend ensures the overall support of the catheter.

[0015] II. This invention, through the combined design of an elastic tube, a support body, and a constraint mechanism, can provide axial and radial support to both ends of the elastic tube, improving its bending strength and preventing bending deformation. Furthermore, in the catheter segment at the vascular bend, the internal constraint mechanism, when compressed by the vascular wall, causes a change in the volume of its internally filled, compressed volume deformable components, such as hydrogel or aerogel. This, in turn, causes deformation of the support body at the vascular bend, reducing its internal support and thus lowering the overall rigidity of the catheter segment at the vascular bend. This allows the catheter segment to conform to the lateral bending of the vascular vessel. Simultaneously, the deformed support body provides axial support to the elastic tube, preventing occlusion of the elastic lumen at the vascular bend.

[0016] Third, the present invention, through the combined design of a cylindrical bladder and a constraint bladder, can provide support for the catheter during its movement, preventing the catheter from bending and becoming blocked. Furthermore, at the bends in the blood vessels, the hydrogel or aerogel pre-filled in the bladder can shrink in volume, causing the overall support structure to automatically loosen, thereby automatically reducing the support of the support structure. No manual adjustment by medical staff is required, and the entire catheter can adapt to changes according to the direction of the blood vessel during use.

[0017] Fourth, through the combined design of radial support ribs and axial support units, this invention can provide axial and radial support for the elastic tube during catheter movement, resulting in good overall catheter support. When the radial support ribs or axial support units move to the bend of the blood vessel, the radial support ribs switch from an inclined state to a radially parallel state under the action of the constraint mechanism, or the axial support units loosen and shake under the action of the constraint mechanism, causing the radial support ribs to move as a whole. In this way, the radial support ribs or axial support units at the bend of the blood vessel reduce the radial or axial support force on the elastic tube under the action of the constraint mechanism, thereby reducing the overall support strength of the support body.

[0018] Fifth, the present invention, through the combined design of elastic membrane and radial support ribs, facilitates the deformation and movement of radial support ribs when the structure of the support changes, and can prevent the liquid passing through the central through hole of the catheter segment from entering the cavity formed between the elastic block and the elastic membrane, thus avoiding drug waste. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a catheter for interventional liver cancer surgery via the radial artery approach, provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the duct node structure; Figure 3 This is a cross-sectional view of the catheter segment; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 Figure 2 Disassembly diagram of the device shown; Figure 6 for Figure 5 Disassembly diagram of the central support structure and constraint mechanism; Figure 7 This is a schematic diagram of the structure of an elastic tube; Figure 8 This is a half-sectional view of the elastic tube; Figure 9 for Figure 2 Disassembly diagram of the device shown when it is bent. Figure 10 for Figure 9 Disassembled diagram of the support body and constraint mechanism in the device shown; Figure 11 This is a schematic diagram of the structure of a catheter for interventional liver cancer surgery via the radial artery approach, provided in Embodiment 2 of the present invention; Figure 12 for Figure 2 A schematic diagram of the device shown; Among them, 1. Catheter joint; 11. Elastic tube; 11a. Cavity; 12. Support body; 12a. Radial support rib; 12b. Arc-shaped support rod; 13. Restraint mechanism; 13a. Tubular capsule; 13b. Restraint capsule; 13c. Connecting tube; 14. Elastic membrane; 2. Heater. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0022] In the description of this invention, it should be understood that the terms "length direction," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and 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. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention based on the specific circumstances.

[0024] Example 1 This embodiment provides a catheter for interventional hepatocellular carcinoma surgery via the radial artery approach, such as... Figures 1 to 10 ,as well as Figure 12 As shown, it includes multiple catheter segments connected end to end; these multiple catheter segments are connected in sequence to form a catheter with a smooth outer surface, avoiding damage to the inner wall of the blood vessel.

[0025] Each catheter segment includes an elastic tube 11, a support 12, a restraint mechanism 13, and two elastic membranes 14.

[0026] The elastic tube 11 has a double-layer structure, including an inner tube and an outer tube. The two ends of the inner tube are fixedly connected to the ends of the outer tube, forming an annular cavity. The elastic tube 11 provided by this invention is made of a medical-grade elastic material; for example, this medical-grade elastic material is polyether block amide. Preferably, the outer diameter of the elastic tube 11 is ≤5Fr, the inner diameter of the elastic tube 11 is between 0.97 mm and 1.1 mm, and the length is between 15 mm and 20 mm.

[0027] Two elastic membranes 14 are located inside the annular cavity and at both ends of the elastic tube 11. Specifically, the elastic membranes 14 are annular sheet structures and are fixedly connected to the inner tube and the outer tube respectively. In this way, each elastic membrane 14 and the elastic block 11 form a mounting cavity 11a, which is used to mount the support body 12 and the constraint mechanism 13.

[0028] It should be noted that the elastic membrane 14 provided in this embodiment of the invention is made of a highly elastic medical material, for example, medical silicone rubber or thermoplastic polyurethane.

[0029] The support body 12 includes multiple radial support ribs 12a and two axial support units.

[0030] Multiple radial constraint support ribs 12a are inclinedly disposed in the cavity formed between the inner tube and the outer tube, and both ends of each radial constraint support rib 12a pass through the elastic membrane 14 on the same side and are located in the mounting cavity 11a. The radial support ribs 12a provided by the present invention are made of elastic medical metal material, for example, nickel-titanium alloy wire. Preferably, the diameter of the radial constraint support ribs 12a is 0.2 mm.

[0031] Two axial support units are located in corresponding mounting cavities 11a. Specifically, each axial support unit includes multiple circumferentially arranged and spaced arc-shaped support rods 12b. The center of each arc-shaped support rod 12b is fixedly connected to the end of the corresponding radial support rib 12a, and each arc-shaped support rod 12b is fixedly connected to the constraint mechanism 13 so as to cooperate with the constraint mechanism 3 to provide support for the elastic block 11.

[0032] The arc-shaped support rod 12b provided by the present invention is made of a rigid material. For example, the rigid material is titanium-aluminum-vanadium alloy or medical stainless steel. Furthermore, the present invention does not limit the fixed connection method between the arc-shaped support rod 12b and the radial support rib 12a. For example, the fixed connection method is welding through a T-shaped connecting block.

[0033] The restraint mechanism 13 includes a tubular capsule 13a and two restraint components.

[0034] Specifically, the tubular capsule 13a is located between the inner tube and the outer tube, at the center of the outer tube. The tubular capsule 13a is pre-filled with a pressure-deformable component. The pressure-deformable portion does not intersect with the radial support ribs 12a, but rather contacts them. In actual use, the tubular capsule 13a is sleeved with each radial support rib 12a, with both ends of each radial support rib 12a located in the corresponding mounting cavity 11a, and the middle portion of the radial support rib 12a located inside the tubular capsule 13a. Preferably, the pressure-deformable component is a hydrogel or aerogel.

[0035] Hydrogels and aerogels are both existing technologies. Specifically, a hydrogel is a three-dimensional hydrophilic polymer network filled with a large amount of water. When not under pressure, the osmotic pressure inside the hydrogel is balanced with the elastic contractile force of the polymer network. When under pressure, the balance is disrupted, the water is forced to flow out, and the overall volume of the hydrogel decreases.

[0036] Aerogels are three-dimensional networks with a framework of nanoparticles or polymer chains, filled with air, and have an ultra-high porosity of over 99%. When compressed, the internal gas can escape rapidly, the pore walls bend but do not break, and the volume shrinks significantly. After the pressure is released, the aerogel can quickly rebound to its original size.

[0037] Two constraint components are respectively disposed in the corresponding mounting cavities and are fixedly connected to the cylindrical capsule 13a. The constraint components include: multiple constraint capsules 13b and multiple connecting tubes 13c.

[0038] Multiple constraint capsules 13b are arranged in a circular pattern at equal intervals within the corresponding mounting cavity 11a, and the constraint capsules 13b are arranged intersecting with the arc-shaped support rods 12b. The two ends of each arc-shaped support rod 12b are fixedly connected to the corresponding constraint capsule 13b. Each constraint capsule 13b is pre-filled with hydrogel or aerogel, similar to the cylindrical capsule 13a. The portion of the pressure-deformed volume does not insert into the arc-shaped support rod 12b, but is in contact with the arc-shaped support rod 12b.

[0039] One end of each connecting tube 13c is fixedly connected to the corresponding constraint capsule 13b, and the other end passes through the elastic membrane 14 and is fixedly connected to the tubular capsule 13a.

[0040] Taking the example that the interior of the tubular capsule 13a and each constraint capsule 13b is pre-filled with hydrogel, the use of the catheter for interventional liver cancer surgery via the radial artery approach provided in this embodiment of the invention includes the following three situations: Scenario 1: The catheter is advanced in the straight end of the blood vessel; During the catheter's passage through the blood vessel, since the tubular capsule 13a and each restraint capsule 13b are pre-filled with hydrogel and are not compressed by the inner wall of the blood vessel, the volume and rigidity of each restraint capsule 13b remain unchanged. Therefore, the positions of each arc-shaped support rod 12b remain unchanged, thereby keeping each radial support rib 12a in an inclined state. At this time, the radial support rib 12a provides radial support to the elastic tube 11, and the arc-shaped support rod 12b, together with the restraint capsule 13b, provides radial support to the elastic tube 11.

[0041] Scenario 2: The tubular capsule 13a in a certain duct segment 1 advances to the bend of the blood vessel; When the tubular capsule 13a in a catheter segment 1 moves to the bend of the blood vessel, the inner wall of the blood vessel at the bend compresses the tubular capsule 13a. Since the hydrogel is filled with a large amount of water, the hydrogel shrinks in volume after being compressed, and the water inside the hydrogel is squeezed out. This significantly reduces the overall compressive strength of the tubular capsule 13a and increases its flexibility, so as to conform to the side wall of the blood vessel. As the overall volume of the hydrogel shrinks and the water is discharged, the compression and fixation effect of the hydrogel on the central part of the radial support rib 12a is reduced. This allows the central part of the radial support rib 12a to move inside the tubular capsule 13a, which reduces the rigidity at the center of the catheter segment 1, so that the catheter segment 1 at this point can conform to the side bend of the blood vessel. At the same time, the arc-shaped support rods 12b at both ends provide radial support to the two ends of the elastic block 11 to prevent the internal occlusion of the catheter segment 1.

[0042] Case 3: The restraint capsule 13b at the front end of a certain catheter segment 1 advances to the bend of the blood vessel. When a constraint capsule 13ba in a catheter segment 1 moves to the bend in the blood vessel, the inner wall of the blood vessel at the bend compresses the constraint capsule 13b. The water inside the hydrogel in each constraint capsule 13b is squeezed out, causing the hydrogel to shrink in volume. The water inside the constraint capsule 13b increases the overall softness of the constraint capsule 13b. At this time, the constraint of the constraint capsule 13b on the arc-shaped support rod 12b is reduced, allowing the arc-shaped support rod 12b to move inside the installation cavity 11a. This reduces the radial support strength of the arc-shaped support rod 12b on the elastic block 11, so that the constraint capsule 13b at this point conforms to the lateral bend of the blood vessel. At the same time, as the arc-shaped support rod 12b moves, the radial support rib 12a gradually changes from an inclined state to a radially parallel state, thereby reducing the overall bending strength of the catheter segment 1, so that the catheter segment 1 bends and deforms, thus passing through the bend in the blood vessel.

[0043] Example 2 Based on Example 1, the difference from Example 1 is as follows: Figure 11As shown, the catheter for interventional surgery of liver cancer via radial artery approach provided in this embodiment of the invention can also be used in conjunction with an existing heater 2 to heat the elastic tube 11 in each catheter segment 1, so that the temperature of the elastic block 11 is close to the human body temperature. In this way, during the insertion of the catheter into the human body, the catheter segment 1 can avoid irritation to the blood vessel contact site, and the elastic tube 11 can be softened, so that the catheter segment 11 can be bent, allowing the catheter to enter the patient's body more smoothly.

[0044] It should be noted that the heater 2 provided in this embodiment of the invention is prior art, and this embodiment of the invention does not make any improvements to it.

[0045] Application Cases Taking the radial artery approach for hepatocellular carcinoma interventional surgery as an example, the use of the device provided in this embodiment of the invention includes the following steps: S1: Preoperative preparation; S2: Radial artery puncture; specifically, locate the point of strongest radial artery pulsation by palpation, puncture with a radial artery puncture needle, insert a guidewire after seeing blood return, and then insert a radial artery sheath; S3: Catheter angiography and pathway establishment; S4: Superselective tumor-feeding artery cannulation; this step includes the following steps: S401: Insert the catheter to the tumor target vessel via superselective delivery; Specifically, during the passage of the catheter through the blood vessel, the radial support rib 12a provides radial support to the elastic tube 11, and the arc-shaped support rod 12b, combined with the constraint capsule 13b, provides radial support to the elastic tube 11. When the tubular capsule 13a in a catheter segment 1 moves to the bend of the blood vessel, the inner wall of the blood vessel at the bend compresses the tubular capsule 13a. Since the hydrogel is filled with a large amount of water, the hydrogel shrinks in volume after being compressed, and the water inside the hydrogel is squeezed out, which increases the overall softness of the tubular capsule 13a. This reduces the fixation of the radial support rib 12a. At this time, the compression and fixation effect of the hydrogel on the central part of the radial support rib 12a is reduced, so that the central part of the radial support rib 12a can move inside the tubular capsule 13a. This reduces the rigidity at the center of the catheter segment 1, so that the catheter segment 1 at this point can conform to the lateral bend of the blood vessel. At the same time, the arc-shaped support rods 12b at both ends provide radial support to the two ends of the elastic block 11 to prevent the catheter segment 1 from being blocked inside.

[0046] When the restraint capsule 13ba in a catheter segment 1 moves to the bend of the blood vessel, the inner wall of the blood vessel at the bend compresses the restraint capsule 13b. Similarly, the water inside the hydrogel of the restraint capsule 13b is squeezed out after being compressed, causing the hydrogel to shrink in volume. The water inside the restraint capsule 13b increases the overall softness of the restraint capsule 13b. At this time, the restraint of the restraint capsule 13b on the arc-shaped support rod 12b is reduced, allowing the arc-shaped support rod 12b to move inside the installation cavity 11a. This reduces the radial support strength of the arc-shaped support rod 12b on the elastic block 11, so that the restraint capsule 13b at this point conforms to the lateral bend of the blood vessel. At the same time, as the arc-shaped support rod 12b moves, the radial support rib 12a gradually changes from an inclined state to a radially parallel state, thereby reducing the overall bending strength of the catheter segment 1, so that the catheter segment 1 bends and deforms, thus passing through the bend of the blood vessel. S402: After confirming the correct location, begin interventional treatment for liver cancer; S5: After treatment, remove the microcatheter, angiography catheter and radial artery sheath, apply pressure to the patient's wrist to stop bleeding, apply pressure bandage, and help the patient return to the ward.

[0047] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A catheter for a radial artery approach to liver cancer intervention surgery, characterized by, It includes multiple catheter nodes (1) connected in sequence; each catheter node (1) includes: The elastic tube (11) has a double-layer structure and elastic membranes (14) are respectively provided at both ends inside. Each elastic membrane (14) and the inner wall of the elastic tube (11) form an installation cavity (11a). The support (12) is disposed inside the elastic tube (11), and both ends are located in the mounting cavity (11a) on the same side; The constraint mechanism (13) is located inside the elastic tube (11), with both ends located in the mounting cavity (11a) and connected to the support body (12).

2. The catheter for interventional liver cancer surgery via radial artery approach according to claim 1, characterized in that, The constraint mechanism (13) includes: A tubular capsule (13a) is located at the center of the elastic tube (11) and is pre-filled with a pressure-deformable component. Two constraint components are respectively disposed in the corresponding mounting cavity (11a) and connected to the tubular capsule (13a).

3. The catheter for interventional liver cancer surgery via radial artery approach according to claim 2, characterized in that, The constraint components include: Multiple constraint capsules (13b) are arranged in a circular pattern at equal intervals in the corresponding mounting cavity. The interior of the constraint capsules (13b) is pre-filled with a pressure-deformation component. Multiple connecting tubes (13c), one end of each connecting tube (13c) is connected to the corresponding constraint capsule (13b), and the other end passes through the elastic membrane (14) and is connected to the tubular capsule (13a).

4. The catheter for interventional liver cancer surgery via radial artery approach according to claim 3, characterized in that, The support (12) includes: Multiple radial support ribs (12a) are sleeved with the cylindrical capsule (13a), and their two ends are located in the mounting cavity on the same side; Two axial support units are located in their respective mounting cavities, and each axial support unit is connected to the end of the constraint assembly and the radial support rib (12a) on the same side.

5. A catheter for interventional liver cancer surgery via radial artery approach according to claim 4, characterized in that, The axial support unit includes multiple equally spaced arc-shaped support rods (12b) arranged in a circular pattern. The arc-shaped support rods (12b) are intersected with the constraint capsule (13b). Both ends of each arc-shaped support rod (12b) are connected to the corresponding constraint capsule (13b). The center of each arc-shaped support rod (12b) is connected to the end of the corresponding radial support rib (12a).

6. The catheter for interventional hepatocellular carcinoma surgery via radial artery approach according to claim 4, characterized in that, The radial support rib (12a) is inclinedly disposed inside the elastic tube (11).

7. The catheter for interventional liver cancer surgery via radial artery approach according to claim 1, characterized in that, The elastic membrane (14) has a circular sheet structure.

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