Skin Mechanical Property Measurement via Nonlinear Stochastic Identification
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Solution Overview
Problem
Current methods for assessing skin mechanical properties are limited by their focus on linear properties, inability to characterize dynamic behavior, and lack of standardization, making it difficult to diagnose skin conditions and evaluate the effectiveness of skin care products.
Innovation Solution
A method using nonlinear stochastic system identification to measure skin mechanical properties by perturbing the skin with a stochastic sequence and modeling it as a system with both linear and nonlinear components, allowing for quantitative assessment of compliance, elasticity, stiffness, and damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional linear measurement methods are used to assess skin mechanical properties, then the measurement process is simple and easy to perform, but the measurement precision and reliability are insufficient because they cannot characterize dynamic behavior and nonlinear properties
Solution Approach 1:
The patent applies dynamics by transitioning from static linear measurement to dynamic nonlinear measurement. The system uses dynamic perturbation signals to excite the skin tissue and measures the frequency response function across multiple frequencies, enabling characterization of dynamic mechanical properties including nonlinear behavior that static methods cannot capture.
Solution Approach 2:
The patent employs mechanical vibration through dynamic perturbation signals applied to the skin tissue. The system vibrates the tissue at multiple frequencies and measures the response, allowing extraction of dynamic mechanical properties such as stiffness, damping, and elasticity that are invisible to static measurement methods.
2Reliability
If comprehensive dynamic and nonlinear characterization is implemented, then the diagnostic capability and product assessment accuracy are significantly improved, but the measurement time and complexity increase
Solution Approach 1:
The patent uses periodic action through multi-frequency sinusoidal perturbation signals. By applying periodic excitations at different frequencies and measuring the steady-state response, the system efficiently extracts dynamic mechanical properties. This periodic approach allows comprehensive characterization within reasonable time frames compared to exhaustive measurement methods.
Solution Approach 2:
The patent employs copying by using a calibrated probe system that replicates standardized measurement conditions. The system captures frequency response functions that serve as characteristic signatures of skin properties, allowing reliable comparison across different subjects and conditions without requiring repeated exhaustive measurements.
3Ease of operation
If qualitative touch assessment is used by cosmetologists and dermatologists, then the ease of operation is high, but the loss of information occurs because information cannot be passed between different individuals or compared across clinical studies
Solution Approach 1:
The patent replaces the subjective mechanical touch assessment with an objective instrumented measurement system. The device uses controlled mechanical perturbation and sensor-based detection to quantify skin properties, replacing the unreliable human tactile system with a standardized mechanical measurement system that produces objective, comparable data.
Solution Approach 2:
The patent applies parameter changes by transforming subjective tactile sensations into objective quantitative parameters. The system measures frequency response functions and extracts mechanical properties such as stiffness, damping, and elasticity as numerical values, enabling information to be communicated precisely between different practitioners and studies without loss or subjectivity.
Data Source
AI summary
A method for testing the effect of a skin care product includes measuring a mechanical property of skin tissue using nonlinear stochastic system identification, applying the product to the skin, repeating the measurement of the mechanical property after the application of the product, and comparing the before and after measurements to quantify the effect of the product.Measuring the mechanical property of the skin can include placing a probe against a surface of the skin, perturbing the skin with the probe using a stochastic sequence, and measuring the response of the skin to the perturbation. Perturbing the skin can include indenting the skin with the probe, extending the skin with the probe, and sliding the probe across the skin surface. The mechanical property may be indicative of skin compliance, skin elasticity, skin stiffness, or skin damping. The mechanical property can be dependent on perturbation depth and may be measured at a plurality of anatomical locations.