Methods and devices for reduction of motion-induced noise in optical vascular plethysmography
US6997879B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 9, 2002 |
| Grant date | Feb 14, 2006 |
| Priority date | — |
| Expiry date | Oct 20, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/36514
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Methods and devices are provided for reducing motion artifacts when monitoring volume changes in blood vessels. Light having a first wavelength and light having a second wavelength are transmitted through a human appendage, toward the epidermis of a patient, or through tissue within the body of a patient. A portion of the light having the first wavelength and a portion of the light having the second wavelength is received. A first signal is produced based on the received portion of light having the first wavelength. A second signal is produced based on the received portion of light having the second wavelength. One of the first and second signals is subtracted from the other to produce a plethysmography signal that is representative of volume changes in blood vessels of patient tissue.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.