EP 1041923 A1 20001011 - ARTEFACT REDUCTION IN PHOTOPLETHYSMOGRAPHY
Title (en)
ARTEFACT REDUCTION IN PHOTOPLETHYSMOGRAPHY
Title (de)
ARTEFAKTREDUZIERUNG IN PHOTOPLETHYSMOGRAPHIE
Title (fr)
REDUCTION DES ARTEFACTS EN PHOTOPLETHYSMOGRAPHIE
Publication
Application
Priority
- GB 9803757 W 19981215
- GB 9727085 A 19971222
- GB 9812540 A 19980610
Abstract (en)
[origin: WO9932030A1] In order to remove motion artefact prior to digital processing, the invention provides a method of monitoring living tissue comprising the steps of emitting electromagnetic radiation at said tissue at at least first and second different wavelengths, receiving the radiation at the different wavelengths after it has been transmitted through or reflected within said tissue, providing at least first and second signals which are a logarithmic measure of the received first and second radiation wavelengths and subtracting the second signal from the first signal, removing a DC component of the result of the subtraction and providing an AC component to digital sampling means, and processing the digital samples in order to provide a desired value representing a property of the tissue.
IPC 1-7
IPC 8 full level
A61B 5/145 (2006.01); A61B 5/00 (2006.01); A61B 5/1455 (2006.01); A61B 5/1464 (2006.01)
CPC (source: EP)
A61B 5/145 (2013.01); A61B 5/14551 (2013.01)
Citation (search report)
See references of WO 9932030A1
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
WO 9932030 A1 19990701; EP 1041923 A1 20001011; JP 2001526073 A 20011218
DOCDB simple family (application)
GB 9803757 W 19981215; EP 98960018 A 19981215; JP 2000525029 A 19981215