Global Patent Index - EP 1041923 A1

EP 1041923 A1 2000-10-11 - ARTEFACT REDUCTION IN PHOTOPLETHYSMOGRAPHY

Title (en)

ARTEFACT REDUCTION IN PHOTOPLETHYSMOGRAPHY

Title (de)

ARTEFAKTREDUZIERUNG IN PHOTOPLETHYSMOGRAPHIE

Title (fr)

REDUCTION DES ARTEFACTS EN PHOTOPLETHYSMOGRAPHIE

Publication

EP 1041923 A1 (EN)

Application

EP 98960018 A

Priority

  • GB 9803757 W
  • GB 9727085 A
  • GB 9812540 A

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 (main, further and additional classification)

A61B 5/00; A61B 5/024

IPC 8 full level (invention and additional information)

A61B 5/145 (2006.01); A61B 5/00 (2006.01); A61B 5/1455 (2006.01); A61B 5/1464 (2006.01)

CPC (invention and additional information)

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

EPO simple patent family

WO 9932030 A1 19990701; EP 1041923 A1 20001011; JP 2001526073 A 20011218

INPADOC legal status


2002-06-26 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20011128

2001-08-29 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20010717

2000-10-11 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000628

2000-10-11 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE FR GB IT NL