A simulation detection system and method for portal vein collapse under high intra-abdominal pressure

Abstract

This invention belongs to the field of medical simulation and detection technology, and discloses a simulation detection system and method for portal vein collapse under intra-abdominal hypertension. The system includes: an external pressure chamber configured to contain a first pressure medium to simulate an intra-abdominal compression environment; an internal pressure pipeline suspended within the external pressure chamber, configured to contain a second pressure medium to simulate the target portal vein; a pressure regulating component connected to both the external pressure chamber and the internal pressure pipeline, configured to regulate and maintain the trans-wall pressure difference between the external pressure chamber and the internal pressure pipeline; and an acoustically transparent isolator disposed outside the external pressure chamber, configured to provide an acoustic window, allowing external acoustic detection equipment to perform non-compression morphological detection of the internal pressure pipeline through the acoustic window. In summary, this system can effectively simulate portal vein collapse under intra-abdominal hypertension, and the acoustically transparent isolator enables external acoustic detection equipment to accurately acquire detection images without contacting the object being tested.

Description

Technical Field

[0001] This invention belongs to the field of medical simulation and detection technology, specifically relating to a simulation and detection system and method for portal vein collapse under intra-abdominal hypertension. Background Technology

[0002] Intra-abdominal hypertension (IAH) is a common critical illness in intensive care units. Its core pathology lies in the increased intra-abdominal pressure (IAP) compressing the thin-walled, low-pressure portal venous system, leading to portal vein collapse, a sharp reduction in blood flow, and consequently liver damage.

[0003] In clinical and basic research, ultrasound is the preferred tool for assessing portal vein morphology (such as internal diameter and cross-sectional area). Traditional ultrasound operation training mainly relies on theoretical learning and clinical observation to accumulate experience. However, there are significant subjective differences in the measurement of portal vein internal diameter among different operators and with different ultrasound equipment. Furthermore, during routine ultrasound examinations, the probe directly contacts and compresses the patient's abdominal wall or the surface of an animal model. This additional pressure can alter the true geometry of the portal vein, especially when the vessel itself is already collapsed, further distorting the measurement results and making it difficult to achieve standardized and repeatable training. Summary of the Invention

[0004] In view of this, in order to solve the problems mentioned in the background art, the purpose of the present invention is to provide a simulation detection system and method for portal vein collapse under intra-abdominal hypertension.

[0005] To achieve the above objectives

[0006] This invention provides a simulation detection system for portal vein collapse under intra-abdominal hypertension, comprising:

[0007] An external pressure chamber is configured to contain a first pressure medium to simulate and provide an abdominal compression environment;

[0008] An internal pressure pipeline is suspended within the external pressure chamber and configured to contain a second pressure medium to simulate the target portal vein.

[0009] A pressure regulating component is connected to the external pressure chamber and the internal pressure pipeline respectively, and is configured to regulate and maintain the transwall pressure difference between the external pressure chamber and the internal pressure pipeline;

[0010] An acoustically transparent insulating element is disposed on the outside of the external pressure chamber and configured to provide an acoustic window, allowing external acoustic testing equipment to perform non-compression morphological testing of the internal pressure pipeline through the acoustic window.

[0011] Preferably, the simulation testing system further includes a coupling medium; the coupling medium is disposed on the inner and outer sides of the acoustically transparent isolation component to form a non-contact acoustic coupling path between the external acoustic testing equipment and the internal pressure pipeline.

[0012] Preferably, the coupling medium located inside the acoustically transparent isolator fills the space between the acoustically transparent isolator and the external pressure chamber.

[0013] Preferably, the simulation testing system further includes a data acquisition unit; the data acquisition unit includes an external pressure sensor and an internal pressure sensor respectively disposed in the external pressure chamber and the internal pressure pipeline.

[0014] Preferably, the pressure regulating assembly includes an external pressure controller and an internal pressure controller.

[0015] Preferably, the sound-permeable insulating component is a rigid sound-permeable plate made of at least one of acrylic, polycarbonate, polystyrene or high sound-permeable ceramic, and its thickness is 5 to 10 mm.

[0016] Preferably, the internal pressure tubing is a flexible hollow tube made of at least one of medical silicone, polyurethane, or hydrogel, with an outer diameter of 8–15 mm, a wall thickness of 0.3–1.0 mm, and a hardness of 20–40 A Shore. The internal pressure tubing 2 is coaxially fixed to the center of the external pressure chamber 1 so that the abdominal pressure simulated by the external pressure chamber 1 is uniformly applied to the circumference of the internal pressure tubing 2.

[0017] This invention also provides a simulation detection method for portal vein collapse under intra-abdominal hypertension, comprising:

[0018] The internal pressure pipeline is suspended and assembled in the external pressure chamber;

[0019] The internal pressures of the internal pressure pipeline and the external pressure chamber are adjusted separately by the pressure regulating component to create a transwall pressure difference;

[0020] Using external acoustic testing equipment, the internal pressure pipeline is subjected to non-compression morphological testing through the sound-permeable isolation component located outside the external pressure chamber, and a cross-sectional image of the internal pressure pipeline is obtained.

[0021] The deformation index of the internal pressure pipeline is calculated based on the cross-sectional image.

[0022] Preferably, the expression for calculating the deformation index is:

[0023] ;in, The distance between any two edge points in the cross-sectional image is given. For the maximum distance, The minimum distance.

[0024] Preferably, the simulation detection method further includes: constructing a pressure difference-deformation standard reference curve with the transwall pressure difference as the abscissa and the deformation index as the ordinate.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] (1) The present invention provides a simulation detection system for portal vein collapse under intra-abdominal hypertension. By constructing an independent and controllable external pressure chamber and a suspended internal pressure pipeline, a precisely adjustable trans-wall pressure difference simulation environment is formed. At the same time, an acoustic channel is provided by a sound-permeable isolation component set outside the external pressure chamber, so that external acoustic detection equipment can obtain detection images without penetrating the flexible cavity wall or directly contacting the internal pressure pipeline, thereby effectively blocking the pressure transmission path during the detection process and ensuring the authenticity of the detection data.

[0027] (2) In the simulation detection system of the present invention, the internal and external pressures are independently controlled by the pressure adjustment component, thereby effectively meeting the experimental and training requirements of multi-level pressure gradient loading.

[0028] (3) This invention provides a simulation detection method for portal vein collapse under intra-abdominal hypertension. A pressure difference-deformation standard reference curve is constructed through multi-gradient pressure testing, which can be effectively applied to calibrating different ultrasound equipment or training operators. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the simulation detection system of the present invention;

[0030] Figure 2 This is a flowchart of the simulation detection method of the present invention;

[0031] Figure 3 This is the pressure difference-deformation standard reference curve constructed in the embodiments of the present invention;

[0032] In the diagram: External pressure chamber-1; Internal pressure pipeline-2; Pressure regulating component-3; Sound-permeable isolation component-4; Coupling medium-5; Data acquisition unit-6. Detailed Implementation

[0033] To further understand the content of this invention, a detailed description of the invention is provided in conjunction with the accompanying drawings and embodiments. The structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art, and are not intended to limit the implementation conditions of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention. It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein.

[0034] Example 1

[0035] like Figure 1 As shown in the figure, the simulation detection system for portal vein collapse under intra-abdominal hypertension provided in this embodiment includes an external pressure chamber 1, an internal pressure pipeline 2, a pressure regulating component 3, a sound-permeable isolation component 4, a coupling medium 5, and a data acquisition unit 6.

[0036] The following is a detailed explanation of each structure:

[0037] The external pressure chamber 1 is configured to contain a first pressure medium to simulate the abdominal cavity compression environment. Specifically, the external pressure chamber 1 constitutes a closed space that can withstand internal positive or negative pressure. The first pressure medium filled inside can be a liquid (such as water or saline) or a gas to effectively simulate the circumferential pressure on internal organs and blood vessels caused by the high-pressure environment inside the human abdominal cavity.

[0038] The internal pressure line 2 is configured to contain a second pressure medium to simulate the target portal vein. Specifically, the internal pressure line 2 serves as the object being tested, and the second pressure medium contained within it is used to simulate the blood perfusion pressure within the blood vessel. It should be noted that the internal pressure line 2 is coaxially suspended and fixed in the center of the external pressure chamber 1, so that the internal pressure line 2 is only deformed by the internal and external pressure difference (i.e., the transmural pressure difference), and ensures that the abdominal pressure simulated by the external pressure chamber 1 can act uniformly on the circumference of the internal pressure line 2.

[0039] To ensure the accuracy of the simulation of portal vein collapse under intra-abdominal hypertension by the external pressure chamber 1 and the internal pressure pipeline 2, the internal pressure pipeline 2 is preferably a flexible hollow tube made of at least one of medical silicone, polyurethane or hydrogel, with an outer diameter of 8-15 mm (preferably 10 mm), a wall thickness of 0.3-1.0 mm (preferably 0.5 mm), and a hardness of 20-40 A Shore (preferably 30 A Shore).

[0040] Taking the internal pressure tubing 2 made of medical-grade silicone as an example, its mechanical parameters are compared with those of porcine portal vein tissue in the following table:

[0041]

[0042] As can be seen from the above, the internal pressure tubing 2 made of medical silicone is highly similar to the mechanical parameters of the porcine portal vein tissue. Therefore, it is feasible to use the internal pressure tubing 2 made of medical silicone to simulate the portal vein.

[0043] The pressure regulating assembly 3 includes an external pressure controller and an internal pressure controller, respectively connected to the external pressure chamber 1 and the internal pressure pipeline 2. The external pressure controller is configured to regulate and maintain the pressure within the external pressure chamber 1 (hereinafter referred to as external pressure), and the internal pressure controller is configured to regulate and maintain the pressure within the internal pressure pipeline 2 (hereinafter referred to as internal pressure), thereby determining the transwall pressure difference between the external pressure chamber 1 and the internal pressure pipeline 2. For example, in simulating vascular collapse caused by intra-abdominal hypertension, the internal pressure can be kept constant while the external pressure is gradually increased.

[0044] The acoustically transparent isolator 4 is disposed on the outside of the external pressure chamber 1 and is configured to provide an acoustic window, allowing external acoustic testing equipment to perform non-compression morphological testing of the internal pressure pipeline 2 through the acoustic window. Specifically, the acoustically transparent isolator 4 is a rigid acoustically transparent plate made of at least one of acrylic, polycarbonate, polystyrene, or high acoustic transparency ceramic, and its thickness is 5-10 mm. In the specific testing process, the external acoustic testing equipment (such as an ultrasonic probe) only needs to contact the outer surface of the acoustically transparent isolator 4 or interact with the acoustically transparent isolator 4 through the coupling medium 5, without needing to penetrate the external pressure chamber 1 or directly press the internal pressure pipeline 2, effectively avoiding geometric deformation of the internal pressure pipeline 2 caused by equipment pressure.

[0045] The coupling medium 5 is disposed on the inner and outer sides of the acoustically transparent isolator 4 to form a non-contact acoustic coupling path between the external acoustic detection equipment and the internal pressure pipeline 2. Specifically, the coupling medium 5 located on the inner side of the acoustically transparent isolator 4 fills the space between the acoustically transparent isolator 4 and the external pressure chamber 1 to eliminate the air gap at the interface between the acoustically transparent isolator 4 and the external pressure chamber 1. It should be understood that the coupling medium 5 can be a liquid ultrasonic coupling agent, a hydrogel gasket with similar acoustic impedance matching characteristics, an oily gel, or other media capable of filling the interface gap and conducting ultrasonic waves, as long as it can achieve low-loss transmission of acoustic energy.

[0046] In actual operation, the operator presses the external acoustic testing equipment onto the outer surface of the acoustically transparent isolator 4 coated with liquid coupling medium 5 for scanning. The acoustically transparent isolator 4 is configured as a rigid structure, which can resist the pressing pressure of the external acoustic testing equipment without deformation. This ensures that the shape change of the internal pressure pipeline 2 only responds to the cross-wall pressure difference regulated by the pressure regulating component 3, and is independent of the magnitude of the probe pressing pressure, thereby effectively avoiding the distortion of the test results.

[0047] The data acquisition unit 6 includes an external pressure sensor and an internal pressure sensor respectively installed on the external pressure chamber 1 and the internal pressure pipeline 2. Specifically, the external pressure sensor and the internal pressure sensor are connected in series via a tee connector on the pipelines near the inlet of the external pressure chamber 1 and the inlet of the internal pressure pipeline 2, respectively, to achieve in-situ monitoring of the internal and external pressures. The external pressure controller dynamically adjusts the injection or discharge of the first pressure medium based on the real-time reading of the external pressure sensor, while the internal pressure controller precisely maintains the injection pressure of the second pressure medium based on the feedback from the internal pressure sensor.

[0048] Example 2

[0049] like Figure 2 As shown, this embodiment provides a simulation detection method for portal vein collapse under intra-abdominal hypertension. This method is executed based on the simulation detection system described in Embodiment 1, and specifically includes:

[0050] S1. The internal pressure pipeline 2 is suspended and assembled in the external pressure chamber 1;

[0051] During assembly, the operator must fix both ends of the internal pressure pipeline 2 to the opposite wall of the external pressure chamber 1 through the sealing interface, and ensure that the middle section of the internal pressure pipeline 2 is in a suspended state without rigid support.

[0052] S2. The internal pressures of the inner pressure pipeline 2 and the outer pressure chamber 1 are adjusted respectively by the pressure regulating component 3 to establish a trans-wall pressure difference;

[0053] The operator can independently set and dynamically adjust the ambient pressure in the external pressure chamber 1 and the infusion pressure in the internal pressure pipeline 2 through the external pressure controller and internal pressure controller in the pressure regulating component 3. For example: fix the internal pressure at a physiological value of 10 mmHg; start the external pressure from 0 mmHg and gradually increase it in preset increments of 5 mmHg to the target maximum value of 30 mmHg; after each change in external pressure, wait at least 2 minutes until the pressure fluctuation displayed by the data acquisition unit 6 is ≤0.5 mmHg.

[0054] S3. Using external acoustic testing equipment, the internal pressure pipeline 2 is subjected to non-compression morphological testing through the sound-permeable isolation component 4 located outside the external pressure chamber 1, and a cross-sectional image of the internal pressure pipeline 2 is obtained.

[0055] During operation, the external acoustic detection equipment (such as an ultrasonic probe) only contacts the outer surface of the acoustically transparent isolation component 4 or the coupling medium 5 on its outer side. Therefore, it is ensured that the obtained cross-sectional image truly reflects the natural shape of the internal pressure pipeline 2 under the action of the trans-wall pressure difference set in step S2.

[0056] It should be understood that although ultrasonic imaging is preferred as the morphological detection method in this embodiment, in other embodiments, optical coherence tomography (OCT), high-speed imaging, or other non-contact imaging technologies that can obtain internal structural information through the acoustically transparent isolator 4 can also be selected as needed, as long as the function of interference-free morphological acquisition can be achieved.

[0057] S4. Calculate the deformation index of the internal pressure pipeline 2 based on the cross-sectional image;

[0058] The expression for calculating the deformation index is:

[0059] ;in, The distance between any two edge points in the cross-sectional image is given. For the maximum distance, The minimum distance.

[0060] Specifically, the deformation index is used to characterize the degree of ellipticization or collapse of the internal pressure pipeline 2 under the current stress state. When the internal pressure pipeline 2 is in a perfectly circular filled state, The PVCI value is 0; as the transwall pressure difference increases, the internal pressure pipeline 2 deforms under pressure. and As the difference increases, the PVCI value rises accordingly; when internal pressure line 2 is fully closed... As the value approaches 0, the VCI value approaches 1.

[0061] S5. Construct a pressure difference-deformation standard reference curve with the trans-wall pressure difference as the abscissa and the deformation index as the ordinate;

[0062] Figure 3 This embodiment shows the differential pressure-deformation standard reference curve. Specifically, this differential pressure-deformation standard reference curve is mainly applied to the following non-diagnostic scenarios:

[0063] (1) Used for the calibration of measurement consistency of ultrasonic equipment. Different brands or models of ultrasonic equipment have differences in image processing algorithms, gain compensation and edge recognition strategies, which may lead to inconsistent measurement results for the same target. By comparing the measurement curves formed by each device to be calibrated with the standard reference curve, the equipment deviation can be quantitatively evaluated and the equipment parameters can be adjusted accordingly, thereby achieving homogenization of multi-center research data.

[0064] (2) Used for operator technique training and assessment. Novice operators often find it difficult to master the appropriate probe pressure and cross-section selection skills. When training with the simulation detection system of this invention, if the trainee's real-time measurement results deviate significantly from the standard reference curve, it indicates that there are problems such as excessive pressure or incorrect cross-section in the operation. This enables immediate feedback, shortens the learning time, and improves the standardization of operation.

[0065] (3) Used for new algorithm validation. When developing automatic blood vessel segmentation or deformation analysis algorithms, this standard reference curve provides a known ground truth, which can be used to objectively evaluate the accuracy and robustness of the algorithm, avoiding the evaluation uncertainty caused by the lack of standards when using clinical data for validation.

[0066] It is important to emphasize that all of the above applications are strictly limited to physical model testing, equipment performance verification, and skills training, and do not involve disease diagnosis, pathological evaluation, or treatment plan development for humans or animals.

[0067] In summary, to intuitively evaluate the effectiveness of this invention in eliminating differences in operator technique, the following comparative experiment was designed:

[0068] The experiment included two control groups: a traditional direct contact group and a non-contact group based on the present invention.

[0069] In the traditional direct contact group, the operator directly uses the ultrasound probe to press the surface of the external pressure chamber 1 to perform measurements, simulating contact ultrasound examinations in routine clinical or animal experiments.

[0070] In the non-contact assembly of the present invention, the operator strictly follows the method described in Example 2 to perform non-compression morphological inspection of the internal pressure pipeline 2 in the external pressure chamber 1 through the sound-transparent isolation member 4.

[0071] The experiment selected three individuals with different ultrasound operation experiences as test subjects: a senior ultrasound physician with 10 years of experience, an ICU physician with 1 year of ultrasound experience, and a graduate student with no ultrasound operation experience.

[0072] Under a constant transwall pressure differential of 15 mmHg in external pressure chamber 1 and 10 mmHg in internal pressure pipeline 2, three operators independently performed three repeated measurements. The test results are shown in the table below:

[0073]

[0074] Therefore, it can be seen that in the traditional direct contact group, due to the difficulty in quantifying the probe pressure and the variation from person to person, the internal pressure line 2 experienced different degrees of non-physiological additional collapse: the mean values ​​of PVCI measured by senior ultrasound physicians, ICU physicians and graduate students were 32.5%, 28.1% and 21.3% respectively, with the maximum range among the three as high as 11.2%, indicating that the consistency of the measurement results was poor and heavily dependent on the operator's personal experience and technique. In contrast, in the non-contact assembly of this invention, thanks to the rigid acoustic isolation component 4 bearing all the probe pressure, and the incompressible coupling medium 5 transmitting only acoustic energy, the shape of the internal pressure pipeline 2 is completely determined by the set trans-wall pressure difference, unaffected by human interference. The average values ​​of PVCI measured by the three operators were 29.8%, 30.1%, and 29.6%, respectively, with the maximum range between the three reduced to 0.5%. This demonstrates that this invention can completely decouple the imaging process from the mechanical loading process from a physical structure perspective, resulting in highly objective and repeatable measurement results. Even inexperienced operators can obtain measurement data that is highly consistent with that of senior experts, thus effectively solving the problem of measurement distortion caused by probe pressure in the prior art.

[0075] Furthermore, to verify the stability and repeatability of the simulation testing system of this invention under different mechanical loading conditions, this embodiment also conducted a multi-gradient external pressure test: with the internal pressure pipeline 2 fixed at 10 mmHg, the pressure in the external pressure chamber 1 was sequentially set to five gradients: 0, 10, 20, and 30 mmHg, using the pressure regulating component 3. The same operator performed three repeated measurements of the PVCI at different time points at 48-hour intervals. The test results are shown in the table below:

[0076]

[0077] Therefore, it can be seen that the coefficient of variation (CV) of the PVCI measurement value is less than 3% under all test pressure gradients, and the ICC is greater than 0.95 at each pressure point. This shows that the system of the present invention is not only stable at a single pressure point, but also provides high-confidence mechanical-morphological correspondence data over a wide pressure range throughout the pathological evolution of intra-abdominal hypertension, thereby ensuring the accuracy of the pressure difference-deformation standard reference curve.

[0078] In the description of this invention, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0079] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A simulation detection system for portal vein collapse under intra-abdominal hypertension, characterized in that, include: An external pressure chamber (1) is configured to contain a first pressure medium to simulate providing an abdominal compression environment; An internal pressure pipeline (2) is suspended within the external pressure chamber (1) and configured to contain a second pressure medium to simulate the target portal vein; The pressure regulating component (3) is connected to the external pressure chamber (1) and the internal pressure pipeline (2) respectively, and is configured to regulate and maintain the trans-wall pressure difference between the external pressure chamber (1) and the internal pressure pipeline (2); The acoustic isolation component (4) is disposed on the outside of the external pressure chamber (1) and configured to provide an acoustic window so that external acoustic testing equipment can perform non-compression morphological testing on the internal pressure pipeline (2) through the acoustic window.

2. The simulation detection system for portal vein collapse under intra-abdominal hypertension according to claim 1, characterized in that: It also includes the coupling medium (5); The coupling medium (5) is disposed on the inner and outer sides of the acoustically transparent isolation component (4) to form a non-contact acoustic coupling path between the external acoustic detection device and the internal pressure pipeline (2).

3. The simulation detection system for portal vein collapse under intra-abdominal hypertension according to claim 2, characterized in that: The coupling medium (5) located inside the sound-permeable isolation member (4) fills the space between the sound-permeable isolation member (4) and the external pressure chamber (1).

4. The simulation detection system for portal vein collapse under intra-abdominal hypertension according to claim 1, characterized in that: It also includes a data acquisition unit (6); The data acquisition unit (6) includes an external pressure sensor and an internal pressure sensor respectively installed on the external pressure chamber (1) and the internal pressure pipeline (2).

5. The simulation detection system for portal vein collapse under intra-abdominal hypertension according to claim 4, characterized in that: The pressure regulating component (3) includes an external pressure controller and an internal pressure controller.

6. The simulation detection system for portal vein collapse under intra-abdominal hypertension according to claim 1, characterized in that: The sound-permeable isolation component (4) is a rigid sound-permeable plate made of at least one of acrylic, polycarbonate, polystyrene or high sound-permeable ceramic, and its thickness is 5 to 10 mm.

7. The simulation detection system for portal vein collapse under intra-abdominal hypertension according to claim 1, characterized in that: The internal pressure pipeline (2) is a flexible hollow tube made of at least one of medical silicone, polyurethane or hydrogel, with an outer diameter of 8 to 15 mm, a wall thickness of 0.3 to 1.0 mm and a hardness of 20 to 40 A Shore. The internal pressure pipeline (2) is coaxially fixed to the center of the external pressure chamber (1) so that the abdominal pressure provided by the external pressure chamber (1) is uniformly applied to the circumference of the internal pressure pipeline (2).

8. A simulation detection method for portal vein collapse under intra-abdominal hypertension, characterized in that, include: The internal pressure pipeline (2) is suspended and assembled in the external pressure chamber (1); The internal pressures of the internal pressure pipeline (2) and the external pressure chamber (1) are adjusted by the pressure regulating component (3) to create a trans-wall pressure difference; Using an external acoustic testing device, the internal pressure pipeline (2) is subjected to non-compression morphological testing through the sound-transparent isolation component (4) located outside the external pressure chamber (1), and a cross-sectional image of the internal pressure pipeline (2) is obtained. The deformation index of the internal pressure pipeline (2) is calculated based on the cross-sectional image.

9. The simulation detection method for portal vein collapse under intra-abdominal hypertension according to claim 8, characterized in that, The expression for calculating the deformation index is: ;in, The distance between any two edge points in the cross-sectional image is given. For the maximum distance, The minimum distance.

10. The simulation detection method for portal vein collapse under intra-abdominal hypertension according to claim 8, characterized in that, Also includes: A standard reference curve of pressure difference-deformation is constructed with the transwall pressure difference as the abscissa and the deformation index as the ordinate.

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