Multi-Wavelength PPG Blood Glucose Meter for Noninvasive Accuracy

The patent segments the measurement process by using multiple light sources with different wavelengths (first wavelength, second wavelength, and optionally third wavelength) to independently measure different physiological parameters. Each wavelength targets specific tissue components, allowing the system to separate and independently analyze various optical signals before integrating them for comprehensive glucose assessment.

The patent changes measurement parameters by employing multiple wavelengths of light and calculating multiple PPG response parameters (first PPG response, second PPG response, and optionally third PPG response). The processing unit performs feature extraction on each response and calculates feature ratio values through algorithms, transforming raw optical signals into multiple derived parameters that are then applied to regression models to improve measurement accuracy.

The patent segments the optical measurement system into multiple independent light sources, each emitting at a specific wavelength. This segmentation allows each light source to target different tissue chromophores and physiological processes, providing multiple independent measurement channels that can be processed separately and combined to achieve higher precision.

The patent adds the wavelength dimension to the measurement system by incorporating light sources with different wavelengths. This dimensional expansion transforms a single-parameter measurement into a multi-parameter measurement system, where each wavelength provides additional information about tissue composition and physiological state, thereby improving precision without merely increasing complexity.

The patent replaces the mechanical invasive sampling system with an optical measurement system. Instead of physically piercing the skin to obtain blood samples, the system uses light sources and sensors to non-invasively measure optical properties of tissue that correlate with glucose levels, thereby eliminating mechanical harm while maintaining measurement capability.

The patent introduces light as an intermediary medium to indirectly measure glucose levels. Rather than directly sampling blood, the optical system measures how light interacts with tissue (absorption, scattering, PPG responses), using these optical intermediaries as proxies for glucose concentration, thus avoiding direct invasive contact.