A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 5/0205 (2006.01) A61B 5/024 (2006.01)
Patent
CA 2075064
A pulse-frequency analyzing monitor which is provided with an optical sensor and which is intended for measuring photo- plethysmographically the blood circulation of a subject, such as a body part of a human being or an animal, includes a light source; preferably a light-emitting diode for infrared light, fibre optics, a detector unit for detecting the alternating voltage, or AC-component of a generated PPG-signal for the purpose of determining the heart frequency of the subject, an electronic ampli- fying unit and a presentation unit, for instance an oscilloscope of a display unit. The apparatus also includes means for separat- ing from the detected PPG-signal a signal component which indicates the respiration frequency of the subject. The PPG-signal is coupled to a filter, preferably a digital filter, which enables limit frequencies and the degree of amplification to be set. The digital filter may be a component of a microprocessor which is able to eliminate disturbances, for instance disturbances emanating from 50 Hz stray light, in addition to separating signals concerning the heart and respiration frequency of the subjet. The invention al- so relates to a method of carrying out such photoplethysomographic measuring processes.
Lindberg Lars-Goran
Oberg Ake
Kirby Eades Gale Baker
Lindberg Lars-Goran
Oberg Ake
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