Global Patent Index - EP 0984717 A1

EP 0984717 A1 20000315 - NON-INVASIVE DIAGNOSTIC METHOD AND APPARATUS

Title (en)

NON-INVASIVE DIAGNOSTIC METHOD AND APPARATUS

Title (de)

VERFAHREN UND VORRICHTUNG ZUR NICHT-INVASIVEN DIAGNOSTIK

Title (fr)

METHODE ET APPAREIL DE DIAGNOSTIC NON EFFRACTIF

Publication

EP 0984717 A1 20000315 (EN)

Application

EP 98922975 A 19980526

Priority

  • GB 9801524 W 19980526
  • GB 9710561 A 19970523

Abstract (en)

[origin: WO9852460A1] Two light sources (2, 3; 20, 22) of wavelenghts within the region 1.1 to 1.6 mu m, modulated at the same frequency but in antiphase to each other, are transmitted through a tooth (6; 24). Transmitted light is measured by a detector (9; 26) provided with an electronic filter set (28) to pass only the modulated frequency signal corresponding to differences in absorption between the two wavelenghts. The differential absorption detection serves as a basis for caries detection. Scatter of the light in tissue is offset by the use of optical spatial filtering.

IPC 1-7

A61B 5/00

IPC 8 full level

A61B 5/00 (2006.01); A61C 19/04 (2006.01)

CPC (source: EP)

A61B 5/0088 (2013.01); A61B 2562/0238 (2013.01); A61C 19/04 (2013.01)

Citation (search report)

See references of WO 9852460A1

Designated contracting state (EPC)

DE FR GB IT

DOCDB simple family (publication)

WO 9852460 A1 19981126; AU 7543398 A 19981211; EP 0984717 A1 20000315; GB 9710561 D0 19970716

DOCDB simple family (application)

GB 9801524 W 19980526; AU 7543398 A 19980526; EP 98922975 A 19980526; GB 9710561 A 19970523