A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
73/101, 341/39
A61B 5/02 (2006.01) A61B 5/0225 (2006.01)
Patent
CA 1187310
A B S T R A C T A method for controlling the cuff pressure in the indirect, non-invasive, continuous measurement of blood pressure in a finger by using a photo-electric plethysmograph in a fluid- filled pressure cuff, an electronic control circuit and an electric pressure valve, the cuff pressure being controlled by the plethysmographic signal in closed-loop operation by means of a servo-reference level, so that the arterial volume is maintained at a pre-adjusted value. For the initial adjust- ment, the cuff pressure or the servo-reference level as initial adjustment quantity is automatically changed continuously in the control range by means of a control wave form supplied in the electronic control circuit, that thereby the peak-trough amplitude of the pulsatile plethysmographic signal or cuff pressure signal is detected time and again, and compared with the preceding peak-trough amplitude. The biggest value thereof in the control range and the associated value of the cuff pres- sure at servo-reference level are stored, which value of cuff pressure or servo-reference at the end of the initial adjustment is used as set value for the measurement of the blood pressure.
414276
de Wit Benjamino
Wesseling Karel H.
Nederlandse Centrale Organisatie Voor Toegepast-Natuurwetenschap
Ridout & Maybee Llp
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