초록 ▼

A reflectance pulse oximeter that determines oxygen saturation of hemoglobin using two sources of electromagnetic radiation in the green optical region, which provides the maximum reflectance pulsation spectrum. The use of green light allows placement of an oximetry probe at central body sites (e.g.

A reflectance pulse oximeter that determines oxygen saturation of hemoglobin using two sources of electromagnetic radiation in the green optical region, which provides the maximum reflectance pulsation spectrum. The use of green light allows placement of an oximetry probe at central body sites (e.g., wrist, thigh, abdomen, forehead, scalp, and back). Preferably, the two green light sources alternately emit light at 560 nm and 577 nm, respectively, which gives the biggest difference in hemoglobin extinction coefficients between deoxyhemoglobin, RHb, and oxyhemoglobin, HbO.sub.2.

대표청구항 ▼

[ I claim:] [27.] A method of determining the oxygen saturation of hemoglobin at a central body site comprising the steps of:(a) illuminating skin at the central body site with electromagnetic radiation at a first green frequency to generate a first optical signal from the interaction between the el

[ I claim:] [27.] A method of determining the oxygen saturation of hemoglobin at a central body site comprising the steps of:(a) illuminating skin at the central body site with electromagnetic radiation at a first green frequency to generate a first optical signal from the interaction between the electromagnetic radiation and blood under the skin at the central body site, the first optical signal having an intensity;(b) determining the intensity of the first optical signal;(c) illuminating the skin at the central body site with electromagnetic radiation at a second green frequency to generate a second optical signal from the interaction between the electromagnetic radiation and the blood under the skin at the central body site, the second optical signal having an intensity;(d) determining the intensity of the second optical signal; and(e) determining the oxygen saturation of hemoglobin using the intensity of the first optical signal and the intensity of the second optical signal.