MEASURING TISSUE VOLUME WITH DYNAMIC AUTORECONFIGURATION

摘要

Implementations disclosed herein provide a hydration monitoring technology. In one implementation, a hydration monitoring device measures whole body hydration levels by analysis of changes in vascular volume caused by pulsatile pressure waves and in tissue volume in response to the pulsatile pressure. The hydration monitoring device uses a light-based measurement technique to transmits light, reflectively or transmissively, through tissue. Based on wavelength measurements of the detected light, the hydration monitoring device produces a PPG waveform representing characteristic effects of hydration. The hydration monitoring device monitors operating condition signals associated with the hydration monitoring device. By monitoring operating condition signals, the hydration monitoring device determines whether the operating condition signals satisfy an analysis condition, and modifies the optical sensing operations. Based on the modified optical sensing operations, the PPG waveform is analyzed, and the hydration monitoring device determines a hydration metric representative of hydration levels in the body of the subject.

主权项

1. A method comprising:
determining whether monitored operating condition signals associated with a photoplethysmographic (PPG) monitoring device satisfy an analysis condition based on the monitored operating condition signals from an environmental sensor in the PPG monitoring device; modifying optical sensing operations in the PPG monitoring device if the monitored operating condition signals fail to satisfy the analysis condition; and measuring changes in tissue volume within body tissue of a subject based on the modified optical sensing operations, the modified optical sensing operations satisfying the analysis condition.