Biomaterial Testing via Time-Convolution Analysis
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Solution Overview
Problem
Current methods for testing biomaterials are inadequate in measuring time-invariant properties and require destructive processes, assumptions of material linearity, and pre-selected models, limiting their ability to evaluate biomaterials' behavior under clinically relevant conditions.
Innovation Solution
A non-destructive testing method that applies controlled mechanical loading and measures resulting strain using a single probe-sensor, processing data through time convolution without pre-selected material models, allowing for the evaluation of time-invariant biomaterial functions and properties, including aggregate modulus, viscosity, and permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mechanical testing methods are used to determine material properties, then strength and fatigue parameters can be obtained, but the testing process is destructive and only provides limited parameters under specific loading conditions
Solution Approach 1:
The patent applies dynamic mechanical analysis by subjecting the biomaterial to oscillatory loading at varying frequencies. This dynamic approach enables non-destructive measurement of time-invariant properties across multiple loading conditions simultaneously, resolving the contradiction between obtaining comprehensive material data and avoiding destructive testing.
Solution Approach 2:
The method changes the loading frequency parameter systematically while measuring the material response. By analyzing the frequency-dependent behavior through spectral decomposition, the patent extracts time-invariant properties without destroying the specimen, thus achieving complete material characterization non-destructively.
2Measurement precision
If standard mechanical tests are performed to evaluate biomaterials, then tensile strength and fatigue limit can be determined, but the tests assume material linearity and require pre-selected constitutive models
Solution Approach 1:
The patent segments the complex material response into frequency-domain components through spectral analysis. This decomposition allows independent measurement of time-invariant properties without requiring assumptions about the overall constitutive model, enabling accurate measurement for both linear and non-linear materials.
Solution Approach 2:
The patent replaces traditional mechanical constitutive modeling with a spectral analysis approach. Instead of fitting data to predefined mechanical models, the method uses frequency-domain transformation to directly extract material properties, eliminating the need for model selection assumptions.
3Measurement precision
If multiple separate tests are conducted to measure different material properties, then comprehensive property data can be obtained, but the testing time and complexity increase significantly
Solution Approach 1:
The patent merges multiple property measurements into a single integrated test. By applying oscillatory loading across a frequency spectrum and performing spectral decomposition, the method simultaneously determines multiple time-invariant properties that would otherwise require separate tests, dramatically reducing testing time while maintaining measurement completeness.
Solution Approach 2:
The testing method achieves multi-functionality by using a single oscillatory loading protocol to extract multiple material properties. The spectral analysis framework universally applies to different biomaterial types and provides comprehensive property evaluation from one test, eliminating the need for multiple specialized tests.
4Ease of operation
If biomaterials are tested under static conditions only, then simple measurements can be obtained, but the results do not reflect clinically relevant dynamic loading conditions
Solution Approach 1:
The patent employs periodic oscillatory loading instead of static loading. This periodic action simulates physiological loading conditions that biomaterials experience in vivo, maintaining test simplicity while dramatically improving clinical relevance through frequency-domain analysis of the dynamic response.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the simultaneous measurement of multiple time-invariant properties without assumptions of material linearity, providing accurate and clinically relevant data for biomaterial evaluation, reducing the need for multiple tests and improving the understanding of biomaterial behavior.
Implementation Method 1
establishing a contact of the specimen with a sensor probe... applying a mechanical stimulus to the specimen via the sensor probe... measuring changes in a signal reflecting the specimen dimensions as function of time and applied stimulus parameters
Data Source
AI summary
The invention discloses a method for in vitro testing of specimens, such as biomaterials, to obtain history-dependent, time-invariant functional materials properties using time-convolution and idempotent analysis. The purpose of the method is to measure these properties using a data processing without limitations of materials models, the properties linearity or material homogeneity.