Apparatus and method for detecting blood flow
US7708695B2 · kind B2 · utility
58Cited by
6References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 26, 2005 |
| Grant date | May 4, 2010 |
| Priority date | — |
| Expiry date | Aug 7, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/14
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and apparatus for detecting blood flow in or at a subject's fingertip (20) or other body part, in which Doppler-shifted measuring beam radiation (18) is reflected by the red blood cells and re-enters the laser cavity of the laser diode (10), so as to effect changes in operation thereof, such changes being representative of the blood flow. The apparatus may be incorporated in a fingerprint sensor as a “liveness” detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.