RF Biosensor Impedance Compensation for Noninvasive Molecule Sensing
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Solution Overview
Problem
Traditional methods for measuring molecular concentrations in the human body, such as glucose and hydration levels, are invasive, costly, and lack precision, involving blood sampling and mechanical assessments that can be painful and imprecise.
Innovation Solution
A radio frequency (RF) biosensor system that uses low-power RF signals to non-invasively measure molecular concentrations by analyzing changes in antenna impedance, employing compensation and measurement circuitry to correct for environmental factors and determine molecular concentrations non-invasively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional invasive methods (blood sampling) are used to measure molecular concentrations, then measurement capability is achieved, but user comfort deteriorates and measurement precision is insufficient
Solution Approach 1:
The patent replaces mechanical invasive measurement methods (blood sampling, skin piercing) with a radio frequency electromagnetic field-based measurement system. The RF biosensor uses electromagnetic fields to interact with molecules in the body tissue, detecting molecular concentrations through impedance changes without physical intrusion, thereby eliminating pain and infection risks while maintaining measurement capability
Solution Approach 2:
The patent introduces radio frequency electromagnetic fields as an intermediary medium to transfer measurement information from the body to the sensor. The RF fields penetrate the skin and interact with molecules in the tissue, allowing indirect measurement of molecular concentrations without direct contact or invasion of the biological system
2Measurement precision
If traditional mechanical assessment methods are used for hydration levels, then measurement is achieved, but measurement precision deteriorates
Solution Approach 1:
The patent replaces mechanical assessment methods (skin pinching, visual inspection) with radio frequency electromagnetic field-based measurement. The RF biosensor detects changes in tissue impedance caused by variations in water content, providing precise hydration level measurements through non-contact electromagnetic interaction rather than crude mechanical assessment
3Measurement precision
If invasive blood sampling methods are used, then molecular concentration data is obtained, but cost and complexity increase
Solution Approach 1:
The patent replaces complex mechanical sampling systems (needles, collection tubes, handling protocols) with a simplified radio frequency measurement system. The RF biosensor directly measures molecular concentrations through electromagnetic field interaction with body tissue, eliminating the entire sample collection, transport, and processing chain while maintaining measurement accuracy
Solution Approach 2:
The patent enables the measurement system to perform its function directly on the body without external sample preparation. The RF biosensor self-adjusts to the user's tissue characteristics and automatically compensates for environmental factors, eliminating the need for manual sample handling and external processing equipment
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
The RF biosensor system provides accurate, non-invasive, and cost-effective measurement of molecular concentrations, improving health management by enabling quick and precise monitoring of vital substances like glucose and hydration levels.
Implementation Method 1
A radio frequency (RF) biosensor includes an RF transmitter to generate a first radio frequency (RF) signal
Implementation Method 2
an antenna to present an impedance to the first RF signal, wherein the impedance is affected by a concentration of a type of molecule in the user
Data Source
AI summary
Data about concentration of one or more types of molecules present within a human body are determined noninvasively using radio frequency (RF) signals. Signals at several different frequencies at very low power levels are emitted using an antenna mounted to a wearable device. Operating values, such as changes to the impedance of the antenna resulting from interaction between the RF signals and the user, are associated with the concentration of one or more types of molecules within the user. These changes in impedance may be relatively small. Circuitry in the device determines internal impedance of the circuitry, compensating for internal impedances and improving overall accuracy of the measured impedance resulting from interaction with the user.