Systems and methods for optically sensing characteristics of a blood flow
US7420660B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 15, 2007 |
| Grant date | Sep 2, 2008 |
| Priority date | — |
| Expiry date | Oct 15, 2027 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/3393
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Systems and methods for optically sensing characteristics of a blood flow provide a light source having a driver circuit that includes a source of constant current and a modulator that modulates the constant current at a selected carrier frequency for transmission to the light source. The systems and methods also include a light sensor for receiving light from the light source and producing a modulated output proportional to received light intensity. A receiver circuit including a bandpass filter is coupled to the light sensor to receive the modulated output and having a center frequency at or near the selected carrier frequency to eliminate frequency components above and below the selected carrier frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.