Phantom for repeated catheterization training of liver and gall under ultrasonic guidance

Abstract

The utility model provides a phantom for repeated catheterization training of liver and gall under ultrasonic guidance. Comprising a simulated thoracic and abdominal wall soft tissue layer of an elastic curved surface shell structure, a simulated skeleton which serves as a supporting structure and is embedded with the simulated thoracic and abdominal wall soft tissue layer, a simulated liver filled in a shell cavity of the simulated thoracic and abdominal wall soft tissue layer, and a simulated expanded biliary tract tree, a simulated portal vein network, a simulated expanded gall bladder and a simulated liver abscess which are embedded in the simulated liver, the puncture module is detachably arranged on a soft tissue layer of the simulated thoracic and abdominal wall; the fluid supply assembly supplies liquid with different colors to the simulated expanded biliary tract tree, the simulated portal vein network and the simulated liver abscess; and the two puncture modules are respectively corresponding to the left and right liver lobes of the simulated liver. The phantom disclosed by the utility model has the advantages of being close to a human body structure and a human body tissue, capable of simulating a dynamic process, reusable and low in cost.

Description

Technical Field

[0001] This utility model belongs to the field of medical teaching equipment, and in particular relates to a phantom for training repeated hepatobiliary catheterization under ultrasound guidance. Background Technology

[0002] Hepatobiliary catheterization (such as biliary drainage, cholecystostomy, and drainage of liver abscesses) is a key interventional technique for treating hepatobiliary diseases (such as biliary obstruction and infection). Its success depends on the physician's accurate interpretation of ultrasound images and proficiency in catheter placement. However, the hepatobiliary region has a complex anatomy (adjacent to blood vessels and organs), and operational errors can easily lead to complications such as bleeding and infection. Traditional clinical training relies on an apprenticeship system involving practice on real patients, which carries ethical risks and has a long learning curve. Therefore, various training models with different structures have emerged as training tools in current techniques.

[0003] Current simulation training mainly relies on animal models, commercially available synthetic phantoms, or simple alternative materials (such as gel and silicone models), but all have significant drawbacks. For example, simple alternative materials are too rudimentary and differ greatly from real-world conditions. Animal models are expensive, raise ethical concerns, and their anatomical structures differ significantly from human bodies, making them unusable repeatedly. Traditional synthetic phantom materials do not match the hardness and echogenicity of real tissues, making it difficult to simulate realistic ultrasound imaging feedback, leading to a disconnect between ultrasound imaging and operational skills training. This hinders the mastery of core skills such as "real-time needle tip tracking" and "path planning" through training. They are also prone to breakage after puncture, making repeated catheter placement training impossible. Furthermore, they lack dynamic feedback; most phantoms only provide static anatomical structures and cannot simulate dynamic processes such as tissue deformation and fluid flow (e.g., bile drainage, bleeding) during surgery, thus deviating from real-world scenarios and limiting the comprehensiveness of skills training. They only provide basic puncture training and cannot support simulations of multiple procedures (e.g., PTCD, cholecystostomy, liver abscess drainage). Imported high-end phantoms are expensive and difficult to implement in primary hospitals; traditional model materials are non-biodegradable, generating medical waste pollution. Utility Model Content

[0004] In view of this, in order to solve the above-mentioned technical problems, this utility model proposes a phantom for ultrasound-guided repeated hepatobiliary catheterization training that has a reasonable structural design, is close to the human body structure and tissues, can simulate dynamic processes, is reusable, and is low in cost.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A phantom for ultrasound-guided repetitive hepatobiliary catheterization training, comprising:

[0007] A simulated soft tissue layer of the chest and abdominal wall, wherein the simulated soft tissue layer of the chest and abdominal wall is an elastic curved shell structure;

[0008] A simulated skeleton, which serves as a supporting structure and is fitted into the simulated chest and abdominal wall soft tissue layer;

[0009] The simulated target organ unit includes a simulated liver filling the cavity of the simulated chest and abdominal wall soft tissue shell, and a simulated dilated biliary tree, a simulated portal vein network, a simulated dilated gallbladder, and a simulated liver abscess embedded in the simulated liver.

[0010] A puncture module is detachably mounted on the simulated chest and abdominal wall soft tissue layer; there are two puncture modules, corresponding to the left lobe and right lobe of the simulated liver, respectively;

[0011] A fluid supply assembly supplies different colored fluids to the simulated dilated biliary tree, the simulated portal vein network, and the simulated liver abscess via catheters.

[0012] The simulated soft tissue layer of the chest and abdominal wall, the simulated bone, and the simulated target organ units are all seamlessly bonded with biocompatible adhesives to ensure that there are no layering artifacts when the ultrasound probe slides.

[0013] Two puncture modules are set up, corresponding to the simulated left and right lobes of the liver, respectively, and support changing the puncture route through the left or right lobe of the liver;

[0014] When the simulated dilated gallbladder, simulated dilated biliary tree, simulated portal vein network, and simulated liver abscess are punctured, fluid of the corresponding color will flow out.

[0015] Furthermore, the simulated chest and abdominal wall soft tissue layer is a microbubble-doped elastic silicone layer with a hardness of Shore A 10-20 and a thickness of 1-1.5 cm.

[0016] The simulated soft tissue layer of the chest and abdominal wall mimics the skin, subcutaneous fat layer, and muscle tissue of the human chest and abdominal wall. It uses elastic silicone material doped with microbubbles to simulate the elasticity of soft tissue and the low echo characteristics of ultrasound.

[0017] Furthermore, the simulated skeleton is an ABS plastic frame.

[0018] The simulated skeleton provides sound attenuation in the corresponding areas, recreating the real puncture situation, while also providing mechanical support to prevent the model from deforming during training.

[0019] Furthermore, the simulated liver is an ellipsoid composed of a hydrogel and polyurethane composite with a stiffness of Shore A 30-40 and an acoustic impedance of 1.6-1.7 Mrayl, and a minor axis length of 15-20 cm.

[0020] The simulated liver uses a hydrogel and polyurethane composite to simulate the moderate echogenicity of liver parenchyma.

[0021] Furthermore, the simulated dilated biliary tree is a transparent silicone tube with an outer diameter of 1-1.5 cm and embedded with elastic fibers, filled with simulated bile; the simulated portal vein network is a transparent silicone tube with an outer diameter of 0.5-1 cm and embedded with elastic fibers, filled with simulated blood; the simulated dilated gallbladder is an ellipsoid with a minor axis of 5 cm and a major axis of 10 cm, its wall is made of transparent silicone with embedded elastic fibers, filled with simulated bile, and the simulated dilated gallbladder is connected to the simulated dilated biliary tree; the simulated liver abscess is a sphere with a diameter of 5 cm, its abscess wall is made of transparent silicone with embedded elastic fibers, and filled with simulated pus; the simulated bile, the simulated blood, and the simulated pus are all supplied by the fluid supply component.

[0022] The simulated dilated biliary tree, simulated portal vein network, simulated dilated gallbladder, and simulated liver abscess are made of transparent silicone material with embedded elastic fibers, which presents an anechoic tubular structure under ultrasound.

[0023] Furthermore, the puncture module includes a self-healing polyurethane substrate and a magnetic interface located at the bottom edge of the substrate; the simulated chest and abdominal wall soft tissue layer is provided with a mounting slot for mounting the puncture module, and a magnetic seat is provided on the inner side wall of the bottom end of the mounting slot for magnetic adsorption with the magnetic interface.

[0024] The puncture module is detachably connected to the magnetic base via a magnetic interface; the self-healing polyurethane material can achieve the effect of closing the needle hole within 30 seconds after puncture, supporting hundreds of repeated puncture training sessions.

[0025] Furthermore, the module substrate is a cuboid structure with a length of 5cm, a width of 1cm, and a height equal to the thickness of the simulated chest and abdominal wall soft tissue layer.

[0026] Furthermore, the fluid supply assembly includes a liquid pump and three reservoirs, each independently storing simulated bile, simulated blood, and simulated pus; the reservoir storing the simulated bile is connected to the simulated dilated biliary tree via a conduit; the reservoir storing the simulated blood is connected to the simulated portal vein network via a conduit; and the reservoir storing the simulated pus is connected to the simulated liver abscess via a conduit.

[0027] Different colored solutions are repeatedly injected into different simulated tubes and simulated lesions using a storage tank and a liquid pump. The success rate of catheter placement and drainage is objectively reflected based on the color and volume of the drained liquid.

[0028] Furthermore, it also includes an alarm unit, which includes a pressure-sensitive film sensor attached to the simulated portal vein network and an audible and visual alarm electrically connected to the pressure-sensitive film sensor; the thickness of the pressure-sensitive film sensor is 0.1 mm; the audible and visual alarm includes an LED red light and a buzzer.

[0029] The pressure-sensitive thin-film sensor is connected to an external audible and visual alarm via a flexible circuit, triggering the alarm when the simulated portal vein network is accidentally punctured.

[0030] Compared with existing technologies, the body mold for ultrasound-guided repeated hepatobiliary catheterization training described in this utility model has the following advantages:

[0031] (1) The phantom structure for ultrasound-guided repeated hepatobiliary catheterization training described in this utility model is reasonably designed. By combining the simulated soft tissue layer of the chest and abdominal wall, simulated bones, simulated target organ units, puncture module and fluid supply component, a phantom close to the real human body structure is constructed, providing a realistic operating environment for ultrasound-guided hepatobiliary catheterization training; the fluid supply component can supply different colored liquids to different structures, enabling the phantom to simulate dynamic processes such as tissue deformation and fluid flow during surgery, such as bile drainage and bleeding, increasing the realism and comprehensiveness of the training; the puncture module is detachable, which is convenient for replacement and maintenance, ensuring that the phantom can support multiple repeated catheterization training, reducing training costs, and supporting the switching of puncture paths for the left and right lobes of the liver, which is suitable for training of various surgical procedures;

[0032] (2) The phantom used for ultrasound-guided repeated hepatobiliary catheterization training described in this utility model uses a microbubble-doped elastic silicone layer (Shore A 10-20) to simulate the low-echo characteristics of human soft tissue, ensuring realistic ultrasound imaging. Its thickness of 1-1.5 cm and elastic design replicate the tactile feel of the chest and abdominal wall, enhancing the training effect of puncture tactile feedback. The simulated skeleton uses an ABS plastic frame, which has good mechanical properties, providing stable support for the phantom and preventing deformation during training, ensuring smooth training. Simultaneously, the ABS plastic frame also provides acoustic attenuation in the corresponding areas, recreating a realistic puncture scenario. The simulated liver uses a Shore A hardness... The ellipsoid, composed of hydrogel and polyurethane composite with an acoustic impedance of 30-40 Mrayl and an acoustic impedance of 1.6-1.7 Mrayl, has physical and acoustic properties similar to those of a real liver, simulating the moderate echo of liver parenchyma. Meanwhile, the simulated dilated biliary tree, portal vein network, dilated gallbladder, and liver abscess are all made of transparent silicone material with embedded elastic fibers, presenting an anechoic lumen structure under ultrasound, similar to the ultrasound imaging characteristics of real human tissue, improving the realism of training and the accuracy of ultrasound images. Trainees can accurately train core skills such as "needle tip tracking" and "path planning".

[0033] (3) The module substrate in the phantom for ultrasound-guided repeated hepatobiliary catheterization training described in this utility model is made of self-healing polyurethane material. After puncture, the needle hole closes quickly and supports hundreds of repeated punctures, significantly reducing maintenance costs. The magnetic adsorption design of the magnetic interface and magnetic seat makes the installation and disassembly of the puncture module more convenient, and facilitates replacement and maintenance.

[0034] (4) The fluid supply component in the phantom for ultrasound-guided repeated hepatobiliary catheterization training described in this utility model can supply different colored liquids to the simulated dilated biliary tree, simulated portal vein network, and simulated liver abscess respectively. By observing the color and amount of the drained liquid during the operation, the success rate of catheterization and drainage can be objectively reflected, providing real-time feedback and evaluation basis.

[0035] (5) The alarm unit described in this utility model detects portal vein puncture through a pressure-sensitive thin film sensor and triggers an audible and visual alarm (LED red light + buzzer) to enhance trainees’ ability to identify dangerous anatomical structures and reduce clinical operation risks.

[0036] (6) The phantom for ultrasound-guided repeated hepatobiliary catheterization training described in this utility model solves the problems of ultrasound imaging distortion (material acoustic property matching), non-reusability (self-healing material + magnetic module), static structural limitations (dynamic liquid flow), and lack of operation feedback (color-coded liquid differentiation + alarm system) of traditional phantoms through material innovation, structural optimization and functional integration. It ultimately achieves low-cost, high-simulation, and multi-scenario hepatobiliary catheterization training, which is suitable for popularization in primary hospitals and standardized clinical skills training. Attached Figure Description

[0037] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0038] Figure 1 This is a schematic diagram of the internal structure of the phantom used for ultrasound-guided repeated hepatobiliary catheterization training according to an embodiment of the present invention.

[0039] Figure 2 for Figure 1 Enlarged view of point A;

[0040] Figure 3 Diagram showing the internal connections of the fluid supply assembly.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1-Simulates the soft tissue layer of the chest and abdominal wall; 2-Simulates the skeleton; 3-Puncture module; 4-Fluid supply assembly; 5-Catheter; 6-Simulates the liver; 7-Simulates the dilated biliary tree; 8-Simulates the portal vein network; 9-Simulates the dilated gallbladder; 10-Simulates the liver abscess; 11-Module base plate; 12-Magnetic interface; 13-Mounting slot; 14-Magnetic base; 15-Liquid pump; 16-Reservoir; 17-Pressure-sensitive thin-film sensor; 18-Audible and visual alarm. Detailed Implementation

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0044] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., 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," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

[0046] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0047] As shown in the figure, a phantom for ultrasound-guided repeated hepatobiliary catheterization training includes a simulated chest and abdominal wall soft tissue layer 1, a simulated skeleton 2, a simulated target organ unit, a puncture module 3, a fluid supply assembly 4, and an alarm unit.

[0048] The simulated soft tissue layer 1 of the chest and abdominal wall is an elastic curved shell structure, made of elastic silicone doped with microbubbles with a hardness of Shore A 10-20, and with a thickness of 1-1.5 cm.

[0049] The simulated skeleton 2 serves as a supporting structure and is fitted into the simulated chest and abdominal wall soft tissue layer 1. The simulated skeleton 2 is an ABS plastic frame.

[0050] The simulated target organ unit includes a simulated liver 6 filling the cavity of the shell of the simulated chest and abdominal wall soft tissue layer 1, and a simulated dilated biliary tree 7, a simulated portal vein network 8, a simulated dilated gallbladder 9, and a simulated liver abscess 10 embedded within the simulated liver 6; the simulated liver 6 has a Shore A hardness. The simulated dilated biliary tree 7 is an ellipsoid composed of hydrogel and polyurethane composite with an acoustic impedance of 1.6-1.7 Mrayl and a minor axis length of 15-20 cm. The simulated dilated biliary tree 7 is a transparent silicone tube with an outer diameter of 1-1.5 cm and embedded with elastic fibers, and is filled with simulated bile supplied by the fluid supply component 4. The simulated portal vein network 8 is a transparent silicone tube with an outer diameter of 0.5-1 cm and embedded with elastic fibers, and is filled with simulated blood (red fluid) supplied by the fluid supply component 4. The simulated dilated gallbladder 9 is an ellipsoid with a minor axis of 5 cm and a major axis of 10 cm. Its bladder wall is made of transparent silicone with embedded elastic fibers, and is filled with simulated bile (orange viscous fluid) supplied by the fluid supply component 4. The simulated dilated gallbladder 9 is connected to the simulated dilated biliary tree 7. The simulated liver abscess 10 is a sphere with a diameter of 5 cm. Its abscess wall is made of transparent silicone with embedded elastic fibers, and is filled with simulated pus (yellow viscous fluid) supplied by the fluid supply component 4.

[0051] The puncture module 3 is detachably mounted on the simulated chest and abdominal wall soft tissue layer 1; there are two puncture modules 3, corresponding to the left and right lobes of the simulated liver 6 respectively; the puncture module 3 includes a self-healing polyurethane module substrate 11 and a magnetic interface 12 located at the bottom edge of the module substrate 11; the module substrate 11 is a cuboid structure with a length of 5cm, a width of 1cm, and a height equal to the thickness of the simulated chest and abdominal wall soft tissue layer 1; the simulated chest and abdominal wall soft tissue layer 1 is provided with a mounting slot 13 for mounting the puncture module 3, and a magnetic seat 14 that magnetically attracts the magnetic interface 12 is provided on the inner side wall of the bottom end of the mounting slot 13;

[0052] The fluid supply assembly 4 includes a liquid pump 15 and three reservoirs 16 that independently store simulated bile, simulated blood, and simulated pus, respectively. The reservoir 16 storing simulated bile is connected to a simulated dilated biliary tree 7 via a conduit 5. The reservoir 16 storing simulated blood is connected to a simulated portal vein network 8 via a conduit 5. The reservoir 16 storing simulated pus is connected to a simulated liver abscess 10 via a conduit 5.

[0053] The alarm unit includes a pressure-sensitive film sensor 17 attached to the simulated portal vein network 8 and an audible and visual alarm 18 integrated on the outside of the simulated skeleton 2 and electrically connected to the pressure-sensitive film sensor 17; the thickness of the pressure-sensitive film sensor 17 is 0.1 mm; the audible and visual alarm 18 includes an LED red light and a buzzer.

[0054] The working principle of the phantom used for ultrasound-guided repeated hepatobiliary catheterization training described in this invention is as follows:

[0055] Ultrasound image authenticity: The acoustic impedance of the simulated soft tissue layer of the chest and abdominal wall 1, simulated bone 2, and simulated target organ units is matched with human tissue. When the ultrasound probe scans, the outer layer is hypoechoic (subcutaneous fat, muscle), the liver parenchyma in the organ layer is moderately echoic, and the bile duct / blood vessels / gallbladder / abscess is anechoic, accurately restoring the clinical imaging characteristics.

[0056] Dynamic fluid simulation: After the puncture needle enters the cavity, the tension can be adjusted by controlling the liquid pump 15 to simulate different liquid drainage speeds. The collapse of the lumen and the flow of liquid can be displayed under ultrasound.

[0057] Self-healing and module replacement: The self-healing material of puncture module 3 closes the needle hole through molecular chain reconstruction; the magnetic design allows the damaged part of the puncture area to be replaced individually without discarding the whole module;

[0058] Postoperative assessment mechanism: The success rate of the operation can be manually assessed by the audible and visual alarm 18 after puncture of the portal vein system, as well as the color and volume of the drainage fluid.

[0059] The method of using the phantom for ultrasound-guided repeated hepatobiliary catheterization training described in this utility model is as follows;

[0060] 1. Training Preparation

[0061] Place the phantom on the ultrasound examination table, apply coupling gel, and connect the power supply and data cable.

[0062] 2. Ultrasound-guided procedure

[0063] The trainee uses an ultrasound probe to locate the target and plan the puncture path. Under ultrasound guidance, the Chiba needle is advanced along the puncture module, with real-time ultrasound imaging displaying the needle path and target lesion location. The target bile duct / gallbladder / abscess is punctured. After aspirating and finding the corresponding colored solution, a microguidewire is inserted into the channel through the puncture needle. After removing the puncture needle, the puncture channel is gradually expanded using a dilator (6-8 Fr). After dilation, a multi-port drainage tube is inserted along the guidewire, with the tip placed within the target lesion. The position is adjusted to ensure the side ports are completely within the target lesion. The drainage tube is fixed and connected to a sterile drainage bag. Postoperative ultrasound confirms the catheter position and drainage effectiveness.

[0064] 3. Dynamic feedback trigger

[0065] Successful penetration of the target lesion: By adjusting the pressure pump, the outflow of fluid is simulated, and ultrasound is used to display changes in the lumen.

[0066] Accidental puncture of blood vessel: The pressure-sensitive sensor triggers an audible and visual alarm and records the number of errors.

[0067] 4. Skills Assessment

[0068] After training, an evaluation report is generated based on indicators such as operation time, hit rate, drainage fluid color, and drainage volume.

[0069] 5. Maintenance and Replacement

[0070] After the puncture needle is removed, the self-healing material closes the needle hole; the puncture module should be disassembled and cleaned regularly, and replaced with a new module when it is severely worn.

[0071] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A phantom for training under ultrasound guidance for repeated catheterization of the hepatobiliary system, characterized in that, The application relates to a simulation chest and abdominal wall soft tissue layer, which is an elastic curved shell structure. The simulation chest and abdominal wall soft tissue layer is embedded with a simulation bone as a support structure. The simulation chest and abdominal wall soft tissue layer is embedded with a simulation target organ and visceral unit, which comprises a simulation liver filled in the shell cavity of the simulation chest and abdominal wall soft tissue layer, a simulation dilated biliary duct tree, a simulation portal vein network, a simulation dilated gallbladder and a simulation liver abscess embedded in the simulation liver. The simulation chest and abdominal wall soft tissue layer is embedded with two puncture modules corresponding to the left lobe and the right lobe of the simulation liver respectively. The simulation chest and abdominal wall soft tissue layer is embedded with a fluid supply assembly which supplies different color liquids into the simulation dilated biliary duct tree, the simulation portal vein network and the simulation liver abscess through pipes respectively. The simulation chest and abdominal wall soft tissue layer is a micro-bubble-doped elastic silica gel layer with a Shore A hardness of 10-20 and a thickness of 1-1.5 cm.

2. The phantom for training of ultrasound-guided re-cannulation of the hepatobiliary ducts according to claim 1, characterized in that: The simulation bone is an ABS plastic frame.

3. The phantom for training of ultrasound-guided re-cannulation of liver and gallbladder according to claim 1, characterized in that: The simulation liver is an ellipsoid composed of a hydrogel and a polyurethane compound with a Shore A hardness of 30-40 and an acoustic impedance of 1.6-1.7 Mrayl, and the short axis length is 15-20 cm.

4. The phantom for training of ultrasound-guided re-cannulation of liver and gallbladder according to claim 1, characterized in that: The simulation dilated biliary duct tree is a transparent silica gel pipeline with an embedded elastic fiber and a simulation bile filled in the pipeline, the simulation portal vein network is a transparent silica gel pipeline with an embedded elastic fiber and a simulation blood filled in the pipeline, the simulation dilated gallbladder is an ellipsoid with a short axis of 5 cm and a long axis of 10 cm, the gallbladder wall is a transparent silica gel with an embedded elastic fiber and a simulation bile filled in the gallbladder, the simulation dilated gallbladder is communicated with the simulation dilated biliary duct tree, and the simulation liver abscess is a sphere with a diameter of 5 cm, the abscess wall is a transparent silica gel with an embedded elastic fiber and a simulation pus filled in the abscess.

5. The phantom for training of ultrasound-guided re-cannulation of liver and gallbladder according to claim 1, characterized in that: The puncture module comprises a self-healing polyurethane module substrate and a magnetic attraction interface arranged at the bottom edge of the module substrate, and the simulation chest and abdominal wall soft tissue layer is provided with a mounting groove hole for mounting the puncture module, and a magnetic attraction seat is arranged on the inner wall of the bottom end of the mounting groove hole and magnetically attracted to the magnetic attraction interface.

6. The phantom for training of ultrasound-guided re-cannulation of liver and gallbladder according to claim 1, characterized in that: The module substrate is a cuboid structure with a length of 5 cm, a width of 1 cm and a height same as the thickness of the simulation chest and abdominal wall soft tissue layer.

7. The phantom for training of ultrasound-guided re-cannulation of the hepatobiliary ducts according to claim 6, characterized in that: The fluid supply assembly comprises a liquid pump and three liquid storage grooves respectively independently storing simulation bile, simulation blood and simulation pus, the liquid storage groove storing the simulation bile is connected with the simulation dilated biliary duct tree through a pipe, the liquid storage groove storing the simulation blood is connected with the simulation portal vein network through a pipe, and the liquid storage groove storing the simulation pus is connected with the simulation liver abscess through a pipe.

8. The phantom for training of ultrasound-guided re-cannulation of liver and gallbladder according to claim 1, characterized in that: ​ 9. The phantom for training of ultrasound-guided repeated hepato-chole duct catheterization according to any one of claims 1 to 8, characterized in that: The alarm unit comprises a pressure-sensitive film sensor attached to the simulated portal vein network, and an audible and visual alarm electrically connected to the pressure-sensitive film sensor; the pressure-sensitive film sensor has a thickness of 0.1 mm; and the audible and visual alarm comprises an LED red light and a buzzer.

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