A multi-functional catheter

Abstract

The application provides a multifunctional catheter, comprising a catheter main body and a distal tube with a multi-cavity tube structure. The distal tube comprises a soft end at the proximal end and a functional end at the distal end. The catheter main body and the soft end are provided with a working cavity and a lens cavity. The functional end is further provided with a through hole communicating with the lens cavity. The lens cavity is a circular tube cavity structure extending along the catheter main body and the soft end. The inner wall of the lens cavity is provided with a plurality of accommodation grooves for accommodating photosensitive chips in a lens assembly. The catheter provided by the application can form a space for accommodating photosensitive chips through the plurality of accommodation grooves in the lens cavity, and the lens assembly can be installed without increasing the diameter of the lens cavity, thereby reducing the overall diameter of the catheter to adapt to the more complex bile duct environment relative to the digestive tract.

Description

Technical Field

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

[0002] In minimally invasive surgery, slender instruments are typically inserted through the patient's internal cavities to reach the lesion site for diagnosis and treatment. Because minimally invasive surgery requires high precision and predictability, visualization is particularly important. Therefore, it often relies on slender endoscopic devices or catheters for assistance. These slender catheters, in addition to providing channels for liquid (gas) entry and exit, data transmission, illumination, and directional deflection, also need to provide working channels for the instruments. This makes it difficult to keep their outer diameter small; they generally exceed 5mm. For narrow cavities such as the bile duct or pancreatic duct, direct visualization for diagnosis and treatment is impossible.

[0003] Typically, when examining smaller cavities such as the bile duct or pancreatic duct, a duodenoscope is first inserted through the digestive tract to the vicinity of the duodenal papilla. A guidewire is then inserted through the working channel of the endoscope, and various thin diagnostic and therapeutic instruments are inserted using the guidewire. X-rays are continuously used to assess the internal condition of these cavities and adjust the position of the guidewire and instruments. A duodenoscope cannot enter the bile duct; it only remains outside the duodenal papilla. This surgical approach offers poor visualization, especially when accessing bile duct branches, where the complex biliary environment makes the procedure more challenging.

[0004] After reaching the duodenal papilla through the working channel of a conventional duodenoscope, the choledochoscope continues into the bile duct, essentially acting as a sub-scope of the endoscope. Its outer diameter allows it to pass through the working channel of the duodenoscope, and it also provides channels for the working channel, fluid (gas) entry and exit, data transmission, illumination, and directional deflection. The choledochoscope's own working channel is 1.2 mm, limiting its diagnostic and treatment capabilities to instruments smaller than 1.1 mm. However, existing ERCP catheters typically have an outer diameter of 1.8-2.5 mm, making them unsuitable for the aforementioned choledochoscope. Summary of the Invention

[0005] This application provides a multifunctional catheter to address the problem that existing endoscopes are not suitable for biliary tract surgical environments.

[0006] This application provides a multifunctional catheter, comprising: a catheter body with a multi-lumen structure and a distal tube, the distal tube being connected to the distal end of the catheter body; wherein, the catheter body and the distal tube are provided with a working cavity; the distal end face of the distal tube is provided with a through hole communicating with the working cavity; the catheter body and the distal tube are also provided with a lens cavity, the distal end face of the distal tube being provided with a through hole communicating with the lens cavity;

[0007] The lens cavity is a tubular structure extending along the main body of the guide tube and the distal tube; the inner wall of the lens cavity is provided with multiple accommodating slots to accommodate the photosensitive chip in the lens assembly.

[0008] Optionally, the accommodating slot is a right-angled V-shaped slot; the lens cavity is provided with four accommodating slots to form a rectangular space that can accommodate the photosensitive chip in the lens assembly.

[0009] Optionally, the rectangular space formed by the four accommodating slots is coaxial with the lens cavity.

[0010] Optionally, the distal tube includes a flexible end and a functional end; the flexible end is located at the proximal end of the distal tube, and the functional end is located at the distal end of the distal tube.

[0011] Optionally, the end face of the through hole connecting the functional end to the working cavity is an inclined surface.

[0012] Optionally, the diameter of the working cavity is greater than or equal to 48% of the outer diameter of the soft end, and the diameter of the working cavity is greater than or equal to 45% of the outer diameter of the catheter body.

[0013] Optionally, the catheter body and the soft end are further provided with multiple operating cavities; the functional end is provided with multiple connecting holes that communicate with the operating cavities;

[0014] Each of the operating cavities is provided with a control wire, the distal end of which is fixed in the connection hole of the operating cavity, so that the functional end can be pulled by multiple control wires to make the distal tube bend in a specific direction.

[0015] Optionally, the catheter body includes a reinforcing layer that covers the outer wall of the catheter body and the soft end; the reinforcing layer is a braided mesh structure, including a metal braided mesh in the inner layer and a plastic matrix tube in the outer layer.

[0016] Optionally, the multifunctional catheter further includes a handle connected to the proximal end of the catheter body, the handle having multiple coaxial rotating parts;

[0017] The rotating element is connected to the proximal end of the control wire so as to pull the control wire through the rotating element and control the directional bending of the distal tube.

[0018] Optionally, the handle is also provided with a working cavity inlet, which is a 6% standard Luer connector, and the working cavity inlet is connected to the working cavity.

[0019] Optionally, each of the rotating members is connected to two of the control wires, which are wound in opposite directions on the rotating member shaft to generate a tension that controls the directional bending of the distal tube.

[0020] Optionally, the functional end is a cylindrical structure with an outer diameter equal to that of the soft end, and the hardness of the functional end is greater than that of the soft end.

[0021] Optionally, the outer diameter of the catheter body is less than or equal to 3.7 mm; the diameter of the working cavity is greater than or equal to 1.8 mm.

[0022] As can be seen from the above technical solutions, this application provides a multifunctional catheter, including a catheter body with a multi-lumen structure and a distal tube. The catheter body and the distal tube contain a working cavity and a lens cavity. The distal end face of the distal tube also has a through hole communicating with the lens cavity. The lens cavity is a tubular structure extending along the catheter body and the soft end. Multiple receiving grooves are provided on the inner wall of the lens cavity to accommodate the photosensitive chip in the lens assembly. The catheter provided by this application can form a space to accommodate the photosensitive chip through the multiple receiving grooves in the lens cavity, thereby accommodating the lens assembly without increasing the diameter of the lens cavity, reducing the overall diameter of the catheter, and adapting to the more complex biliary environment compared to the digestive tract. Attached Figure Description

[0023] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a multifunctional catheter according to this application;

[0025] Figure 2 This is a schematic diagram of the cross-sectional structure of the catheter body of this application;

[0026] Figure 3 This is a schematic cross-sectional view of the soft end of this application;

[0027] Figure 4 This is a three-dimensional structural diagram of the handle of this application;

[0028] Figure 5 This is a schematic diagram of a functional end cross-sectional structure according to this application;

[0029] Figure 6 This is a three-dimensional structural diagram of the functional end of this application;

[0030] Figure 7 This is a schematic diagram of another functional end cross-sectional structure of this application;

[0031] Illustration:

[0032] Among them, 1-catheter body; 11-reinforcing layer; 2-distal tube; 21-soft end; 22-functional end; 3-working cavity; 4-operation cavity; 5-control wire; 6-lens cavity; 61-containment groove; 7-handle; 71-rotating component; 72-working cavity inlet; 8-injection cavity. Detailed Implementation

[0033] The embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application as detailed in the claims.

[0034] See Figure 1 This is a schematic diagram of the structure of a multifunctional catheter according to this application. Figure 1 , Figure 2 As can be seen, the multifunctional catheter provided in this application mainly includes: a catheter body 1 and a distal tube 2. Both the catheter body 1 and the distal tube 2 are multi-lumen tube structures. The distal tube 2 is connected to the distal end of the catheter body 1, serving as an extension of the distal end of the catheter body 1. In practical applications, the length of the catheter body 1 should be sufficient to extend from outside the patient's body to the lesion location within the patient's internal cavity; the length of the distal tube 2 should be sufficient to meet the travel requirements at the maximum turning angle of the distal end of the catheter.

[0035] The catheter body 1 and the distal tube 2 are provided with a working cavity 3; the distal end face of the distal tube 2 is provided with a through hole communicating with the working cavity 3; the catheter body 1 and the distal tube 2 are also provided with a lens cavity 6, and the distal end face of the distal tube 2 is provided with a through hole communicating with the lens cavity 6.

[0036] Furthermore, the distal tube 2 includes a soft end 21 located proximally and a functional end 22 located distally. The functional end 22 can be used to mount various endoscopic probes, such as cameras and light sources, and also to connect to a control wire that drives the distal tube 2. The soft end 21 connects the catheter body 1 and the functional end 22. In this embodiment, the hardness of the soft end 21 is less than that of the catheter body 1; the soft end 21 is more easily deformable than the catheter body 1, so that it can smoothly enter the patient's internal cavity under the guidance of the guide wire, and also reduce the resistance of the catheter to the cavity tissue wall, avoiding the catheter scratching the patient's internal tissues.

[0037] It should be noted that the fact that the hardness of the soft end 21 is less than that of the catheter body 1 in this application refers to the fact that the soft end 21 is more easily deformed than the catheter body 1, rather than a difference in the hardness of the materials themselves. Therefore, in practical applications, the fact that the hardness of the soft end 21 is less than that of the catheter body 1 can be achieved by using different materials or by using a deformable structure. When achieving a hardness difference through different materials, the catheter body 1 can be made of hard materials, such as polytetrafluoroethylene (PTFE), polyamide (PA), and polyether block amide (Pebax) plastics; the soft end 21 can be made of soft materials, such as PTFE, polyamide (PA), silicone rubber, polyurethane (PU), and polyether block amide (Pebax) with lower hardness after tempering. When achieving a hardness difference through a deformable structure, the soft end 21 can be configured as a corrugated structure, a thin tube structure, a multi-lumen structure, etc., that are easily deformable.

[0038] In the technical solution provided in this application, such as Figure 3 As shown, the catheter body 1 and the flexible end 21 are provided with a working cavity 3; the functional end 22 is provided with a through hole communicating with the working cavity 3. The working cavity 3 can be used in practical applications to insert auxiliary instruments for further diagnosis and treatment, such as biopsy forceps and laser lithotripsy instruments. It can also be used to deliver medications, flush the cavity, and deliver the fluid within the cavity to the outside of the body. To facilitate the operation of auxiliary instruments, the diameter of the working cavity 3 is greater than or equal to 48% of the outer diameter of the flexible end 21, and the diameter of the working cavity 3 is greater than or equal to 45% of the outer diameter of the catheter body 1.

[0039] In practical applications, a larger diameter of the working cavity 3 obviously provides more space for surgical operations, thus facilitating the procedure. However, due to the limitations imposed by the body's internal cavities, the diameters of the catheter body 1 and the soft end 21 cannot be very large; therefore, the diameter of the working cavity 3 cannot be set very large either. Taking the bile duct and pancreatic duct as examples, the outer diameter of the catheter body 1 is less than or equal to 3.7 mm due to the influence of the inner diameter of the bile duct and pancreatic duct cavities. This parameter must be considered when designing the diameter of the working cavity 3.

[0040] Furthermore, the through-hole end face of the functional end 22 connecting to the working cavity 3 is an inclined surface. This inclined surface reduces resistance as the catheter travels through the digestive tract, facilitating its access to the patient's location. For example, such as... Figure 5 , Figure 6 As shown, the inclination angle of the inclined surface can be 45°. Clearly, the end face of the through hole connecting the working cavity 3 can also be formed by splicing together multiple surfaces with different inclination angles, such as... Figure 7As shown, the transition from the lens cavity 6 to the working cavity 3 on the end face of the functional end 22 can be formed by two inclined surfaces, so that the end face shape gradually becomes sharper from flat, which facilitates entry into the digestive tract.

[0041] In the technical solution provided in this application, such as Figure 2 , Figure 5 , Figure 6 As shown, the catheter body 1 and the flexible end 21 are further provided with a lens cavity 6, and the functional end 22 is also provided with a through hole communicating with the lens cavity 6. A lens assembly can be provided at the end face of the through hole on the functional end 22 to acquire images of the environment inside the digestive tract. The inside of the lens cavity 6 can be used to install data cables and other wiring components of the lens assembly to transmit the image data acquired by the lens assembly to a display device for display.

[0042] A lens assembly typically consists of lenses and an image sensor. Images within the digestive tract are refracted by the lenses and projected onto the image sensor to generate an image signal. The size of the lens assembly is limited by the shape of the image sensor; the sensor cannot be too small to avoid low image resolution. Furthermore, while lenses can have various shapes, the image sensor can only be rectangular, resulting in a relatively large space requirement for the lens assembly.

[0043] Therefore, in this application, the lens cavity 6 is a circular tubular structure extending along the guide tube body 1 and the flexible end 21. The inner wall of the lens cavity 6 is provided with multiple accommodating slots 61 to accommodate the photosensitive chip in the lens assembly. In practical applications, the multiple accommodating slots 61 can form a rectangular space to accommodate the photosensitive chip, thereby adapting to the shape of the photosensitive chip and reducing the diameter of the circular tube of the lens cavity 6.

[0044] To form a rectangular structure, the receiving slot 61 is a right-angled V-shaped slot. The lens cavity 6 has four receiving slots 61 to form a rectangular space capable of accommodating the photosensitive chip in the lens assembly. For example, four receiving slots 61 forming right-angled V-shaped slots create a rectangular accommodating space of 1.12 × 1.12 mm, which can accommodate a photosensitive chip of up to 1.12 × 1.12 mm. In this case, the diameter of the circular cavity of the lens cavity 6 is 1.36 mm or smaller. However, without the aforementioned receiving slots 61, a circular cavity with a diameter of 1.7 mm or more is required to accommodate a 1.12 × 1.12 mm photosensitive chip. Therefore, by using multiple receiving slots 61 in the lens cavity 6 to form a space to accommodate the photosensitive chip, the lens assembly can be installed without increasing the diameter of the lens cavity 6, thereby reducing the overall diameter of the guide tube.

[0045] Furthermore, the rectangular space formed by the four accommodating slots 61 is coaxial with the lens cavity 6, which can restrict the center position of the light sensor chip to the center position of the lens cavity 6 while accommodating the light sensor chip of the lens assembly, making it easier to install and fix.

[0046] In this embodiment, the lens assembly can acquire images of the cavity in real time and transmit them to a display device at the proximal end of the catheter via a data cable, so as to display the movement of the catheter in the cavity and the movement of surgical instruments during the actual surgical operation.

[0047] In this application, the distal end of the catheter can be guided by a guidewire in the endoscope to achieve a turning action. However, when the distal end of the catheter travels into the bile duct that the endoscope cannot reach, it is necessary to control the distal end of the catheter to turn using a manipulator wire 5. That is, in some embodiments provided in this application, the catheter body 1 and the soft end 21 are also provided with multiple operating cavities 4; the functional end 22 is provided with multiple connecting holes that connect to the operating cavities 4; each operating cavity 4 is provided with a manipulator wire 5, and the distal end of the manipulator wire 5 is fixed in the connecting hole of the operating cavity 4 so as to pull the functional end 22 through multiple manipulator wires 5, so as to make the distal tube 2 bend in a specific direction.

[0048] In practical applications, one end of the manipulator wire 5 is connected to the functional end 22, and the other end extends from the distal end to the proximal end of the catheter. Therefore, by pulling the manipulator wire 5 at the proximal end of the catheter, the manipulator wire 5 can be made to pull the functional end 22 to generate a tendency to move, forming a serpentine curve on the distal tube 2. Obviously, at least two manipulator wires 5 are required to meet the surgical operation needs, and the number of manipulator wires 5 and operating channels 4 can be appropriately increased to achieve more flexible turning operations.

[0049] In this embodiment, to meet the requirement of fixing the distal end of the control wire 5, the functional end 22 can be made of metal or plastic, and it is connected to the control wire 5 by welding or insert injection molding, so that the distal end of the control wire 5 is fixedly connected to the functional end 22, and the distal tube 2 can be controlled to rotate by adjusting the length of the control wire 5. The diameter of the control wire 5 should be less than 0.35mm, and a strong and wear-resistant metal wire or plastic fiber can be selected.

[0050] As can be seen from the above technical solutions, such as Figure 5As shown, to achieve a continuous cavity, the arrangement of cavities on the catheter body 1, soft end 21, and functional end 22 in this application is consistent. For example, the catheter body 1 has one working cavity 3, four operating cavities 4, and one lens cavity 6. This satisfies the deflection function in four different directions, which not only simplifies the manufacturing process but also saves a significant amount of space. Furthermore, it can simultaneously realize functions such as steering, working cavity operation, fluid injection / aspiration, and optical vision. Its outer diameter is reduced to less than 3.7 mm, which can meet the use of most ERCP devices, namely, meeting the visualization requirements for diagnosis and treatment of the bile duct and pancreatic duct.

[0051] In some embodiments of this application, the catheter body 1 includes a reinforcing layer 11, which covers the outer walls of the catheter body 1, the flexible end 21, and the functional end 22. The reinforcing layer 11 enhances the overall rigidity of the catheter, facilitating its delivery into the patient's internal cavities. Furthermore, it connects the catheter body 1, the flexible end 21, and the functional end 22, allowing the catheter body 1 and the distal tube 2 to be connected as a single unit even when they are not made of the same material or have an integral structure, thus avoiding deformation of the cavity and catheter caused by the use of a connector.

[0052] Furthermore, the reinforcing layer 11 is a braided mesh structure, comprising an inner metal braided mesh and an outer plastic matrix tube. The wall thickness of the reinforcing layer 11 must be at least 0.1 mm on each side to maintain sufficient connection strength. Therefore, when the outer diameter of the conduit body 1 is less than or equal to 3.7 mm, its internal solid diameter must be less than 3.5 mm. Given current extrusion technology and material properties, the effective maximum wall thickness achievable for the conduit body 1 and the soft end 21 (such as using PEBAX, silicone, etc.) is 0.1 mm. Therefore, the internal diameter space for multi-cavity design is less than 3.3 mm, and consequently, the diameter of the working cavity can be designed to be greater than 1.8 mm, meaning the diameter of the working cavity 3 is greater than or equal to 1.8 mm.

[0053] In some embodiments of this application, such as Figure 4 As shown, the multifunctional catheter also includes a handle 7 connected to the proximal end of the catheter body 1. The handle 7 has multiple coaxial rotating members 71. Each rotating member 71 is connected to the proximal end of a control wire 5, allowing the control wire 5 to be pulled via the rotating member 71 to control the directional bending of the distal tube 2. Each rotating member 71 is connected to two control wires 5, and the two control wires 5 are wound in opposite directions on the axis of rotation of the rotating member 71 to generate a pulling force that controls the directional bending of the distal tube 2. Furthermore, the handle 7 also has a working cavity inlet 72, which is a 6% standard Luer connector, and the working cavity inlet 72 connects to the working cavity 3.

[0054] In this embodiment, the proximal end of the catheter body 1 includes a handle 7, and the handle 7 includes a pair of coaxial rotating parts 71, i.e., rotating wheels. Each rotating wheel is connected to two control wires 5 on both sides of its rotating axis. When the multifunctional catheter is used alone or in conjunction with a duodenoscope to reach the target cavity, the doctor holds the handle 7 with one hand or suspends the handle 7 near the working cavity of other endoscopes (such as a duodenoscope) used in conjunction with it.

[0055] By twisting the coaxial rotating component 71 on the handle 7, the shafts of the two coaxial rotating wheels in the handle 7 are rotated. When one of the rotating wheels rotates clockwise, the two symmetrical operating wires 5 connected to it will move relative to each other in the operating cavity 4 of the catheter body 1 and the distal tube 2, generating opposing forces of pull and push. This causes the functional end 22 connected to it to tilt and compress the soft end 21 in the distal tube 2, causing the distal tube 2 to bend in a predetermined direction. When the rotating wheel rotates counterclockwise, the distal tube 2 will bend in the other direction. Similarly, when the other rotating wheel rotates clockwise and counterclockwise, it will also cause the distal tube 2 to bend in other directions.

[0056] In this embodiment, the physician controls the direction of the distal tube 2 entering the patient's body and the cavity of the accompanying endoscope by rotating the rotating component 71 on the rotating handle 7, as well as the direction of observation. Simultaneously, the depth of the distal tube 2 entering and exiting the cavity can be controlled by pushing the handle 7 at the proximal end of the catheter body 1. Additionally, the proximal end of the handle 7 has a working cavity inlet 72 with a 6% standard Luer connector. The working cavity inlet 72 is connected to the working cavity 3. The physician can insert auxiliary instruments for further diagnosis and treatment, such as biopsy forceps and laser lithotripsy instruments, through the working cavity inlet 72. Fluid can also be injected through the working cavity inlet 72 to flush the cavity and remove the fluid from the body.

[0057] In some embodiments provided in this application, the functional end 22 is a cylindrical structure with an outer diameter equal to that of the soft end 21, and the hardness of the functional end 22 is greater than that of the soft end 21. In practical applications, the functional end 22 can be made of hard plastic or stainless steel to form a cylindrical structure, and through holes corresponding to the multi-cavity channels of the soft end 21 are formed on the cylindrical structure. Multiple holes for installation can be pre-formed on the functional end 22 using hard material, such as camera holes, holes for fixing the control wire 5, and agent holes or injection holes connecting to the injection channel 8. Therefore, the greater hardness of the functional end 22 compared to the soft end 21 facilitates the fixing of various installation components, making the overall working process more stable. Furthermore, selecting a functional end 22 with higher hardness also facilitates hole forming and improves process accuracy.

[0058] As can be seen from the above technical solutions, this application provides a multifunctional catheter, including a catheter body 1 with a multi-lumen structure and a distal tube 2. The distal tube 2 includes a soft end 21 located proximally and a functional end 22 located distally. The hardness of the soft end 21 is less than that of the catheter body 1. A working cavity is provided within the catheter body 1 and the soft end 21. A through hole is provided on the functional end 22 to connect to the working cavity 3. The diameter of the working cavity 3 is greater than or equal to 51% of the outer diameter of the soft end 21, and the diameter of the working cavity 3 is greater than or equal to 49% of the outer diameter of the catheter body 1. The catheter provided by this application can achieve a turning function by using the soft end 21 of the distal tube 2 in conjunction with the working cavity 3, allowing the distal end of the catheter to adapt to the more complex biliary environment compared to the digestive tract.

[0059] Meanwhile, the lens cavity 6 is a circular tubular structure extending along the catheter body 1 and the soft end 31; the inner wall of the lens cavity 6 is provided with multiple receiving grooves 61 to accommodate the photosensitive chip in the lens assembly. The catheter provided in this application can form a space to accommodate the photosensitive chip through the multiple receiving grooves 61 in the lens cavity 6, thereby accommodating the lens assembly without increasing the diameter of the lens cavity 6, reducing the overall diameter of the catheter, and adapting to the more complex biliary environment compared to the digestive tract.

[0060] In addition, the multifunctional catheter provided in this application has a working lumen that can accommodate conventional instruments with a diameter of 1.8 mm, making it convenient for doctors to use. It also saves on manufacturing costs and reduces the price of the instruments used in conjunction with it, further reducing the burden on patients.

[0061] Similar parts between the embodiments provided in this application can be referred to mutually. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods extended from the solution of this application without creative effort shall fall within the scope of protection of this application.

Claims

1. A multifunctional catheter, characterized in that, include: The main body of the catheter (1) is a multi-lumen tube structure; The distal tube (2) is a multi-lumen tube structure and is connected to the distal end of the catheter body (1); The catheter body (1) and the distal tube (2) are provided with a working cavity (3); the distal end face of the distal tube (2) is provided with a through hole communicating with the working cavity (3); the catheter body (1) and the distal tube (2) are also provided with a lens cavity (6), and the distal end face of the distal tube (2) is provided with a through hole communicating with the lens cavity (6); The lens cavity (6) is a tubular structure extending along the main body (1) and the distal tube (2); the inner wall of the lens cavity (6) is provided with a plurality of accommodating slots (61) to form a rectangular space through the plurality of accommodating slots (61), the rectangular space being used to accommodate the photosensitive chip in the lens assembly, and each boundary of the rectangular space forming an arc-shaped cavity with the corresponding inner wall of the tubular structure; The cavity structure of the lens cavity (6) is coaxial with the photosensitive chip.

2. The multifunctional catheter according to claim 1, characterized in that, The receiving groove (61) is a right-angled V-shaped groove; the lens cavity (6) is provided with four receiving grooves (61), and the cross-sectional dimensions of the rectangular space are 1.12×1.12mm.

3. The multifunctional catheter according to claim 1, characterized in that, The distal tube (2) includes a soft end (21) and a functional end (22); the soft end (21) is located at the proximal end of the distal tube (2), and the functional end (22) is located at the distal end of the distal tube (2).

4. The multifunctional catheter according to claim 3, characterized in that, The end face of the through hole connecting the functional end (22) to the working cavity (3) is an inclined surface.

5. The multifunctional catheter according to claim 3, characterized in that, The diameter of the working cavity (3) is greater than or equal to 48% of the outer diameter of the soft end (21), and the diameter of the working cavity (3) is greater than or equal to 45% of the outer diameter of the catheter body (1).

6. The multifunctional catheter according to claim 3, characterized in that, The catheter body (1) and the soft end (21) are also provided with multiple operating cavities (4); the functional end (22) is provided with multiple connecting holes that communicate with the operating cavities (4); Each of the operating cavities (4) is provided with a control wire (5), the distal end of which is fixed in the connection hole of the operating cavity (4) so ​​as to pull the functional end (22) through multiple control wires (5) to make the distal tube (2) bend in a specific direction.

7. The multifunctional catheter according to claim 3, characterized in that, The catheter body (1) includes a reinforcing layer (11), which covers the outer wall of the catheter body (1) and the soft end (21); the reinforcing layer (11) is a braided mesh structure, including a metal braided mesh in the inner layer and a plastic matrix tube in the outer layer.

8. The multifunctional catheter according to claim 3, characterized in that, The functional end (22) is a cylindrical structure with an outer diameter equal to that of the soft end (21), and the hardness of the functional end (22) is greater than that of the soft end (21).

9. The multifunctional catheter according to claim 1, characterized in that, The outer diameter of the catheter body (1) is less than or equal to 3.7 mm; the diameter of the working cavity (3) is greater than or equal to 1.8 mm.

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