Noninvasive Glucose Measurement via Skin Adaptation and Thermal Modulation
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Solution Overview
Problem
Current noninvasive glucose measurement methods face challenges due to weak signal specificity, biological noise, and nonspecific tissue responses, which hinder accurate glucose concentration determination, and fail to account for physiological and probe-tissue interaction effects.
Innovation Solution
A temperature-modulated localized reflectance optical probe is used to induce a temperature change in the skin, measuring changes in oxygen consumption and glucose metabolism, which are correlated with glucose concentration through specific optical signals, while adapting the skin to the probe reduces mechanical and thermal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If intrinsic molecular properties of glucose (NIR absorption coefficients) are tracked to achieve specific glucose detection, then the ability to detect glucose independently of other analytes is improved, but the signal becomes extremely weak and is drowned out by biological noise and measurement noise
Solution Approach 1:
The patent changes the measurement parameter from direct glucose absorption to oxygen consumption rate, which is a physiological parameter that responds to glucose metabolism. This indirect measurement approach converts a weak direct signal into a stronger physiological response signal that can be reliably detected.
Solution Approach 2:
The patent introduces oxygen consumption as an intermediary parameter between glucose concentration and the optical signal. Instead of measuring glucose directly, the system measures oxygen consumption changes that result from glucose metabolism, using oxygen as a mediator to translate metabolic activity into a detectable signal.
2Reliability
If the effect of glucose on tissue properties (scattering coefficients, refractive index) is measured to track glucose concentration, then the measurement signal becomes stronger, but the property becomes nonspecific and cannot distinguish glucose from other analytes
Solution Approach 1:
The patent changes from measuring static tissue optical properties to measuring dynamic physiological responses (oxygen consumption rate changes over time). This temporal dimension adds specificity, as the rate of oxygen consumption change is characteristic of glucose metabolism rather than general tissue properties.
Solution Approach 2:
The patent transitions from static measurements of tissue scattering or refractive index to dynamic measurements of oxygen consumption rate changes. By measuring the temporal evolution of oxygen consumption following a stimulus, the system captures metabolic dynamics that are specific to glucose processing rather than general tissue characteristics.
3Device complexity
If physiological response (blood flow, temperature changes) is ignored in glucose measurement, then the measurement process is simpler, but the accuracy is reduced due to unaccounted interference from these physiological effects
Solution Approach 1:
The patent extracts and isolates the oxygen consumption component from the complex physiological response. By using localized reflectance measurements at specific wavelengths and analyzing temporal patterns, the system separates oxygen consumption signals from other physiological effects like blood flow and temperature changes, allowing selective measurement of the metabolic component.
4Device complexity
If probe-tissue interaction effects are not accounted for in the measurement, then the measurement setup is simpler, but the accuracy is compromised due to mechanical and thermal interference from probe contact
Solution Approach 1:
The patent applies preliminary thermal stimulation through the probe before the actual measurement. This pre-heating or pre-cooling action establishes a controlled thermal baseline and induces a known physiological response, allowing the system to distinguish between probe-induced effects and actual glucose-related metabolic changes.
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
This approach enhances signal specificity and accuracy by accounting for physiological and probe-tissue interactions, providing a reliable noninvasive method for glucose monitoring with improved sensitivity and reduced noise interference.
Implementation Method 1
measuring localized reflectance signals
Implementation Method 2
measuring localized reflectance signals at several defined light source-detector distances
Implementation Method 3
A temperature-modulated localized reflectance optical probe which has been brought into contact with the skin for inducing a temperature change in the skin
Implementation Method 4
measuring changes in oxygen consumption and glucose metabolism, which are correlated with glucose concentration through specific optical signals
Data Source
AI summary
An apparatus for noninvasive measurement, which noninvasively measures glucose in a subject optically through a measurement probe, comprising: a light source and a light detector both of which are connected to the measurement probe; an adaptation device which has a shape similar to the measurement probe; and a control unit which performs noninvasive measurement by controlling the light source and the light detector, and also ahead of the noninvasive measurement, controls the adaptation device such that the adaptation device is brought into contact with a skin part of a subj ect for stretching the skin part of the subj ect under a pressure that is higher than a pressure per unit area applied by the measurement probe during the noninvasive measurement, and a corresponding method.