CN-121987392-A - Self-locking artificial vertebral body dynamic performance test method capable of adjusting mechanical load

CN121987392ACN 121987392 ACN121987392 ACN 121987392ACN-121987392-A

Abstract

The invention relates to the technical field of mechanical testing of medical instruments, in particular to a self-locking artificial vertebral body dynamic performance testing method capable of adjusting mechanical load, which comprises the following steps: establishing a reference dynamic test environment comprising a mechanical loading device, a space positioning module and a structural state monitoring module, applying periodic load to an artificial vertebral body, collecting real-time deformation field data, and synchronously processing the deformation field data and load boundary conditions by combining position and posture information to form a dynamic performance data set. And generating a structural behavior deviation matrix by calculating structural behavior consistency measurement and comparing the structural behavior consistency measurement with a reference model, adjusting an initial loading protocol according to the deviation matrix, and executing an updated dynamic loading instruction. The method can realize synchronous matching of the test data and the loading parameters, quantitatively represents the structural behavior difference, forms closed-loop regulation and control of the test and the loading, and improves the accuracy and the data integrity of the dynamic performance test.

Inventors

CAO YUN
HE QIANG
WU QINFAN
YANG NAN
WANG CONG
WANG SHENGBAO
HUANG JIAHU

Assignees

中国工程物理研究院职工医院

Dates

Publication Date: 20260508
Application Date: 20260325

Claims (10)

1. The method for testing the dynamic performance of the self-locking artificial vertebral body with adjustable mechanical load is characterized by comprising the following steps of: establishing a reference dynamic test environment for the self-locking artificial vertebral body with the adjustable mechanical load, wherein the reference dynamic test environment comprises a mechanical loading device, a space positioning module and a structural state monitoring module; Applying periodic load to the self-locking artificial vertebral body with adjustable mechanical load by the mechanical loading device according to a preset initial loading protocol, and simultaneously acquiring and generating real-time deformation field data of the self-locking artificial vertebral body with adjustable mechanical load by the structural state monitoring module; Combining the position and posture information acquired by the space positioning module, and carrying out synchronous processing on the real-time deformation field data and a preset load boundary condition to form a dynamic performance dataset of the self-locking artificial vertebral body with adjustable mechanical load; Based on the dynamic performance data set, calculating structural behavior consistency measurement of the self-locking artificial vertebral body with adjustable mechanical load in the test process, and comparing the structural behavior consistency measurement with a preset reference structural behavior model to generate a structural behavior deviation matrix; And driving the mechanical loading device to adjust the preset initial loading protocol according to the structural behavior deviation matrix, and generating and executing an updated dynamic loading instruction.
2. The method for testing the dynamic performance of the self-locking artificial vertebral body with adjustable mechanical load according to claim 1, wherein the method for establishing the reference dynamic testing environment of the self-locking artificial vertebral body with adjustable mechanical load specifically comprises the following steps: Configuring the mechanical loading device to have the ability to independently apply and adjust forces and moments in a plurality of primary directions; The space positioning module is arranged and consists of at least one optical motion capturing system and an inertial measurement unit array, and is used for resolving the three-dimensional coordinates, euler angles and angular velocities of the self-locking artificial vertebral body with the adjustable mechanical load in a test space in real time; The structural state monitoring module is deployed and consists of a group of high-resolution digital image related systems and an embedded micro-strain sensor network, and is used for synchronously capturing full-field displacement and strain distribution of the self-locking artificial vertebral surface of the adjustable mechanical load under the action of the periodic load; Before the test starts, executing a self-calibration flow of the reference dynamic test environment, wherein the self-calibration flow comprises the steps of calibrating an output force value of the mechanical loading device, registering a coordinate system of the space positioning module and synchronizing sampling frequency of the structural state monitoring module, so that data of the mechanical loading device, the space positioning module and the structural state monitoring module are aligned in time and space.
3. The method for testing the dynamic performance of the self-locking artificial vertebral body with adjustable mechanical load according to claim 2, wherein the synchronizing process is performed on the real-time deformation field data and a preset load boundary condition, and specifically comprises the following steps: Extracting a pose transformation matrix of the self-locking artificial vertebral body with the adjustable mechanical load at each acquisition moment from the position and pose information acquired by the space positioning module; Performing space coordinate transformation on the real-time deformation field data acquired by the structural state monitoring module at the same acquisition time by using the pose transformation matrix, and mapping the real-time deformation field data from a sensor local coordinate system to a global reference coordinate system which is the same as the preset load boundary condition; Aligning the mapped real-time deformation field data with the preset load boundary conditions in the time dimension under the global reference coordinate system, wherein the preset load boundary conditions are a predefined time-varying force and displacement constraint condition set; After alignment is completed, full-field displacement strain information from the real-time deformation field data aligned at each time point is associated and bound with corresponding force and displacement constraint information from the preset load boundary conditions to form one data entry in the dynamic performance data set, wherein the dynamic performance data set is a time-series multidimensional data set comprising force, displacement, strain, position and gesture.
4. The method for testing the dynamic performance of the self-locking artificial vertebral body with adjustable mechanical load according to claim 3, wherein calculating the structural behavior consistency measure of the self-locking artificial vertebral body with adjustable mechanical load in the testing process specifically comprises the following steps: Separating an input load sequence under the preset initial loading protocol from the dynamic performance data set, and a response data sequence of the self-locking artificial cone body with adjustable mechanical load to the input load sequence, wherein the response data sequence comprises displacement response, strain response and gesture change response; Invoking the preset reference structure behavior model from a test database, wherein the preset reference structure behavior model is a mathematical relation set which is established by taking an idealized self-locking artificial cone with the adjustable mechanical load as an object through theoretical calculation or a pre-calibration experiment and describes expected response under standard load input; Taking the input load sequence as the input of the preset reference structure behavior model, and calculating to obtain an expected response sequence of the self-locking artificial vertebral body with the adjustable mechanical load under ideal conditions; In the same time domain window, comparing the expected response sequence with the response data sequence extracted from the dynamic performance data set point by point, and calculating a response deviation value of each comparison point, wherein the response deviation value comprises displacement deviation, strain deviation and attitude angle deviation; and carrying out normalization processing on the response deviation values of all the comparison points, calculating a dimensionless scalar between zero and one based on normalization results, defining the dimensionless scalar as the structural behavior consistency measure, wherein the closer the value is to one, the higher the degree of coincidence between the actual response of the self-locking artificial vertebral body with the adjustable mechanical load and the preset reference structural behavior model in a test time period is.
5. The method for testing the dynamic performance of the self-locking artificial vertebral body with adjustable mechanical load according to claim 4, wherein the generating of the structural behavior deviation matrix specifically comprises the following steps: constructing a two-dimensional matrix, wherein row indexes of the two-dimensional matrix correspond to different load working condition identifications, column indexes correspond to different performance evaluation dimensions, and the performance evaluation dimensions at least comprise rigidity, damping characteristics, energy dissipation rate and self-locking stability margin; For each load working condition identifier, calculating an actual performance evaluation index value of the self-locking artificial cone body with adjustable mechanical load under the load working condition according to a data segment corresponding to the load working condition in the dynamic performance data set; Meanwhile, calculating a reference performance evaluation index value of the self-locking artificial vertebral body with the adjustable mechanical load under the same load working condition identification by using the preset reference structure behavior model; The actual performance evaluation index value is subjected to difference with the corresponding reference performance evaluation index value, so that a performance deviation value of the load working condition in the performance evaluation dimension is obtained; And filling the performance deviation values of all the load conditions in all the performance evaluation dimensions according to a row-column index rule of the two-dimensional matrix, so as to completely construct the structural behavior deviation matrix, wherein the dimension of the structural behavior deviation matrix is determined by the total number of the load conditions and the total number of the performance evaluation dimensions.
6. The method for testing the dynamic performance of the self-locking artificial vertebral body with adjustable mechanical load according to claim 5, wherein the method for testing the dynamic performance of the self-locking artificial vertebral body with adjustable mechanical load is characterized by driving the mechanical loading device to adjust the preset initial loading protocol according to the structural behavior deviation matrix, and generating and executing an updated dynamic loading instruction, and specifically comprises the following steps: setting a dynamic loading strategy mapping table, wherein the dynamic loading strategy mapping table defines the corresponding relation between different types of performance deviation values and loading parameter adjustment actions; Traversing each non-zero element, i.e., each said performance bias value, in said structural behavior bias matrix; For the currently traversed performance deviation value, inquiring the dynamic loading strategy mapping table, and finding one or more loading parameter adjustment suggestions matched with the type of the dynamic loading strategy mapping table, wherein the loading parameters comprise loading force amplitude, loading frequency, phase, loading action points and loading direction; Summarizing all loading parameter adjustment suggestions obtained in the current traversal period, and fusing all loading parameter adjustment suggestions according to a preset priority rule and a conflict resolution rule to form a group of conflict-free specific loading parameter adjustment amounts; Based on the current preset parameters of the initial loading protocol, the loading parameter adjustment quantity is applied to generate the updated dynamic loading instruction, and the updated dynamic loading instruction defines the time course, the spatial distribution and the change rule of the load required to be applied by the mechanical loading device in the subsequent loading period; and sending the updated dynamic loading instruction to a control unit of the mechanical loading device, driving the mechanical loading device to interrupt the preset initial loading protocol currently executed, and immediately starting to run according to the updated dynamic loading instruction.
7. The method of claim 6, further comprising recording a complete test track log comprising the real-time deformation field data, the structural behavior consistency metric, the structural behavior deviation matrix and the updated dynamic loading instruction after generating and executing the updated dynamic loading instruction; the process of recording the complete test track log further comprises the following steps: Continuously monitoring the process of executing the updated dynamic loading instruction by the mechanical loading device, collecting new loading data and new response data generated in the process in real time, and combining the new loading data and the dynamic performance data set in the previous stage to form an extended dynamic performance data set; Repeating the steps of calculating new structural behavior consistency metrics and generating new structural behavior deviation matrices based on the extended dynamic performance data set; Integrating and correlating the extended dynamic performance data set, the new structural behavior consistency metric, the new structural behavior deviation matrix with the previously recorded real-time deformation field data, the structural behavior consistency metric, the structural behavior deviation matrix and the updated dynamic loading instruction according to a time sequence; And storing all integrated data, including all load working conditions, all generated responses and all dynamically adjusted records of the self-locking artificial vertebral body with the adjustable mechanical load in the whole test process into the test database in a time-stamped data packet mode in a structuring way to form the complete test track log.
8. The method for testing dynamic performance of a self-locking artificial vertebral body with adjustable mechanical load according to claim 7, wherein the structural behavior deviation matrix is further used for performing offline analysis, specifically: After the single complete test is finished, extracting all the structural behavior deviation matrixes in the whole test period from the complete test track log; Classifying and arranging the extracted structural behavior deviation matrixes according to load working condition identifiers to form behavior deviation sequences which are specific to each load working condition and evolve with time; carrying out statistical analysis on the behavior deviation sequences of each load working condition, and calculating the mean value, variance, maximum value, minimum value and variation trend of the behavior deviation sequences to evaluate the long-term performance degradation mode and stability characteristics of the self-locking artificial vertebral body with adjustable mechanical load under different types of loads; The results of the offline analysis are stored independently for providing data support for design improvement, life prediction, or clinical application risk assessment of the self-locking artificial vertebral body of the adjustable mechanical load.
9. The method for testing dynamic performance of a self-locking artificial vertebral body with adjustable mechanical load according to claim 8, wherein in the step of synchronizing, if there is a time deviation of non-integer multiple relation between sampling moments of the spatial positioning module and the structural state monitoring module, an interpolation compensation method is adopted, specifically: on a global reference time axis, taking the time stamp of the equipment at the high-frequency sampling end as a benchmark; for the data collected by the low-frequency sampling end equipment, estimating the data value of each reference time stamp on the global reference time axis by using the data value of the adjacent time stamp and adopting a linear interpolation or spline interpolation method; and ensuring that the real-time deformation field data and the preset load boundary conditions have synchronous data pairs at each discrete moment of the global reference time axis by the interpolation compensation method.
10. The method for testing dynamic performance of a self-locking artificial vertebral body with adjustable mechanical load according to claim 9, wherein the test database has a hierarchical structure for efficiently storing and retrieving the complete test track log: the top layer of the test database is a test task record, and the unique identification of each test task, the test target, and the model and number of the self-locking artificial cone with adjustable mechanical load are recorded; The middle layer is a time sequence data block, and the real-time deformation field data, the structural behavior consistency measurement, the structural behavior deviation matrix and the updated sequence of dynamic loading instructions are sequentially stored according to the time sequence of the test process; The bottom layer is an original data and metadata storage area for storing an original data stream which is not processed by synchronization and is from the mechanical loading device, the space positioning module and the structural state monitoring module, and metadata describing a data format, a unit and a coordinate system; And backtracking, contrast analysis and mining of all test data in the whole life cycle of the self-locking artificial vertebral body with the adjustable mechanical load are supported through the hierarchical structure of the test database.

Description

Self-locking artificial vertebral body dynamic performance test method capable of adjusting mechanical load Technical Field The invention relates to the technical field of mechanical testing of medical instruments, in particular to a self-locking artificial vertebral body dynamic performance testing method capable of adjusting mechanical load. Background The conventional mechanical load self-locking type artificial vertebral body dynamic performance test is characterized in that a mechanical loading device with fixed parameters is adopted to apply periodic load, local deformation data of the artificial vertebral body is collected only through a conventional monitoring component, vertebral body position and posture information is obtained without matching with a space positioning module, deformation field data and load boundary conditions are in independent collection states, and basic test data can be formed only. The existing test mode cannot realize space-time synchronous matching of deformation data and load conditions, the real structural state of the artificial vertebral body under dynamic load is difficult to be completely reflected, and the integrity and the synchronism of the test data are obviously insufficient. The conventional test can only complete data acquisition and simple recording, can not perform quantitative calculation on the structural behaviors in the artificial vertebral body test process, and can not obtain quantitative structural behavior deviation results without setting a reference structural behavior model for comparison and analysis. The method can not rely on the quantized structural behavior deviation to adjust the preset initial loading protocol in real time, the mechanical loading device always operates according to the fixed initial parameters, the real-time structural change in the artificial vertebral body testing process can not be adapted, the closed-loop regulation and control are absent in the dynamic loading process, and the dynamic performance test of the self-locking artificial vertebral body with adjustable mechanical load can not be accurately completed. Disclosure of Invention The invention aims to solve the defects in the prior art, and provides a self-locking artificial vertebral body dynamic performance testing method capable of adjusting mechanical load. In order to achieve the purpose, the invention adopts the following technical scheme that the self-locking artificial vertebral body dynamic performance testing method capable of adjusting mechanical load comprises the following steps: establishing a reference dynamic test environment for the self-locking artificial vertebral body with the adjustable mechanical load, wherein the reference dynamic test environment comprises a mechanical loading device, a space positioning module and a structural state monitoring module; Applying periodic load to the self-locking artificial vertebral body with adjustable mechanical load by the mechanical loading device according to a preset initial loading protocol, and simultaneously acquiring and generating real-time deformation field data of the self-locking artificial vertebral body with adjustable mechanical load by the structural state monitoring module; Combining the position and posture information acquired by the space positioning module, and carrying out synchronous processing on the real-time deformation field data and a preset load boundary condition to form a dynamic performance dataset of the self-locking artificial vertebral body with adjustable mechanical load; Based on the dynamic performance data set, calculating structural behavior consistency measurement of the self-locking artificial vertebral body with adjustable mechanical load in the test process, and comparing the structural behavior consistency measurement with a preset reference structural behavior model to generate a structural behavior deviation matrix; And driving the mechanical loading device to adjust the preset initial loading protocol according to the structural behavior deviation matrix, and generating and executing an updated dynamic loading instruction. As a further scheme of the invention, establishing a reference dynamic test environment for the self-locking artificial vertebral body with adjustable mechanical load specifically comprises the following steps: Configuring the mechanical loading device to have the ability to independently apply and adjust forces and moments in a plurality of primary directions; The space positioning module is arranged and consists of at least one optical motion capturing system and an inertial measurement unit array, and is used for resolving the three-dimensional coordinates, euler angles and angular velocities of the self-locking artificial vertebral body with the adjustable mechanical load in a test space in real time; The structural state monitoring module is deployed and consists of a group of high-resolution digital image related systems and an embedde