Optics: measuring and testing – Blood analysis – Hemoglobin concentration
Patent
1987-05-20
1989-05-16
McGraw, Vincent P.
Optics: measuring and testing
Blood analysis
Hemoglobin concentration
128419PG, G01N 3348, A61N 136, A61N 1365
Patent
active
048304883
ABSTRACT:
A measuring instrument for obtaining an intracardial signal indicative of blood oxygen saturation, which may be used to control the stimulation frequency of a heart pacemaker, has a measuring probe which contains a light transmitter and a light receiver. The light receiver receives light from the light transmitter reflected by the blood. The light transmitter and the light receiver are connected in parallel to an evaluation circuit via two leads. A constant current source is connected in series with the light transmitter. The current generated by the light receiver, indicative of blood oxygen saturation, can be identified by forming the difference between current flowing in the measuring probe and the constant current. A reference measurement to compensate for factors in the total current resulting from the lead resistances and the measuring probe temperature is not necessary.
REFERENCES:
patent: 3913403 (1975-10-01), Acara
patent: 4399820 (1983-08-01), Wirtzfeld et al.
Elmqvist Hakan
Heinze Roland
McGraw Vincent P.
Siemens Aktiengesellschaft
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