The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 10, 1996
Filed:
Jun. 08, 1994
Motoki Oda, Hamamatsu, JP;
Yutaka Yamashita, Hamamatsu, JP;
Kazuyoshi Ohta, Hamamatsu, JP;
Mamoru Tamura, Sapporo, JP;
Goro Nishimura, Sapporo, JP;
Hamamatsu Photonics K.K., Hamamatsu, JP;
Abstract
Optical pulses emitted from an optical pulse source is incident on a living tissue and is input to an optical sampling unit. An optical sampling unit detects intensities, f, of optical pulses detected at the respective timings of trigger signals input from a delay unit. A first accumulator calculates products, t.multidot.f, of the intensities f and the delay times t from the delay unit. A second accumulator accumulates the light intensities f. An average optical pathlength calculating unit calculates an average optical pathlength using the accumulation results as the products t.multidot.f and the intensities f. An SO.sub.2 value calculating unit calculates a ratio of V.sub.HbO2 to V.sub.Hb from the average optical pathlength to calculate an SO.sub.2 value.