Apparatus for determining concentrations of light-absorbing materials in living tissue
US6230035A · kind A · utility
262Cited by
2References
8Claims
0Family size
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Key dates
| Filing date | Jul 19, 1999 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Jul 19, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/14552
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Irradiating device 3 of a pulse oximeter includes a scattering plate 6. Scattering light is projected into a living tissue. The diameter of the incident area is sufficiently large compared with that of a light receiving area or vice versa. Therefore, tissue terms in a theoretical formula of .PHI. which represents a ratio of changes of optical densities of tissue measured with two wavelengths are not dependent on the wavelength. The digital processor 10 calculates an oxygen saturation by substituting .PHI. measured into simultaneous equations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.