Non-invasive Glucose Sensor Using RF Antennas
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Solution Overview
Problem
Current non-invasive analyte detection methods face challenges such as lack of specificity, interference from temperature fluctuations and skin compounds, and complexity in placement, particularly when measuring glucose in biological tissues.
Innovation Solution
A non-optical analyte sensor using radio or microwave frequency electromagnetic signals with a plurality of detector elements, including transmit and receive antennas, operates non-invasively or minimally invasively to detect analytes like glucose by transmitting and receiving signals, achieving high accuracy through decoupling of antennas and simultaneous detection from multiple tissue sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-invasive optical methods are used for glucose detection, then patient comfort is improved, but measurement specificity and accuracy deteriorate due to interference from temperature fluctuations, skin compounds, and pigments
Solution Approach 1:
The patent replaces optical detection methods with radio frequency electromagnetic wave-based detection. This substitution eliminates the interference problems associated with optical methods (temperature fluctuations, skin compounds, pigments) while maintaining non-invasive operation. The RF waves penetrate tissue differently and are not affected by the same interfering factors, thus resolving the contradiction between patient comfort and measurement precision.
Solution Approach 2:
The patent changes the detection parameter from optical frequency to radio frequency electromagnetic waves. This parameter change fundamentally alters how tissue is interrogated, allowing non-invasive measurement while avoiding the specific interference issues that plague optical glucose sensors. The RF frequency range provides different tissue penetration and interaction characteristics that improve specificity.
2Measurement precision
If multiple detector elements are used to improve detection accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the detection system into multiple detector elements (antennas) that can be independently positioned and tuned. Each detector element targets specific tissue depths or regions, allowing simultaneous multi-parameter measurement. This segmentation improves precision by capturing signals from different tissue layers while maintaining manageable device complexity through modular design.
Solution Approach 2:
The detector elements serve multiple functions: they can transmit electromagnetic signals, receive reflected signals, and potentially operate at different frequencies to probe different tissue depths. This multi-functionality allows a single sensor device to perform comprehensive glucose measurement without requiring separate specialized components for each function, thus improving precision without proportionally increasing complexity.
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 sensor achieves high accuracy with a mean absolute relative difference (MARD) value of 5.0% to 9.9%, outperforming commercially available glucose sensors, and can be used as a reference standard for comparing other sensors' accuracy.
Implementation Method 1
transmit an electromagnetic signal in the radio or microwave frequency range into a target
Implementation Method 2
receive an electromagnetic signal in the radio or microwave frequency range resulting from transmission of the electromagnetic signal
Implementation Method 3
detecting an analyte via spectroscopic techniques using non-optical frequencies
Data Source
AI summary
A highly accurate glucose sensor that detects glucose by transmitting and receiving sensing signals in a radio or microwave frequency range of the electromagnetic spectrum is provided. The glucose sensor has at least two antennas at least one of which operates as a transmit antenna to transmit one or more of the sensing signals and at least one of which operates as a receive antenna, and the glucose sensor has a mean absolute relative difference (MARD) value of about 5.0% to about 9.9%, or of about 5.0% to about 7.0%, or of about 5.0%.