Title :
The Navicon: a noninvasive monitor of instantaneous blood pressure using a compressible air-space servocontroller
Author :
Hyndman, B.W. ; Ibelings, J.H.I. ; Nije, J.D. ; Stuart, E. P Verrijn ; van der Hofstede, J.W. ; Zeelenberg, C.
Author_Institution :
Center for Med. Inf., Leiden, Netherlands
Abstract :
The operation of the monitor is based on the method of Penaz (1973), in which the cross-section of a finger artery is clamped to a value corresponding to its unloaded size by enclosing the finger in an inflatable cuff which incorporates a photoelectric source/detector pair, and using the signal from the detector to drive a pressure servocontroller which is pneumatically connected to the inflatable cuff. Unlike other embodiments of this method, cuff pressure is controlled by an air-filled miniature bellows driven by a linear motor. Because of the lightweight construction of the voice-coil armature, the frequency response of this servocontroller is flat to above 100 Hz, and the closed-loop response of the entire servomechanism (including finger) far exceeds the 25 Hz bandwidth required for high-fidelity reproduction of the arterial pressure waveform. This, plus a new cuff design, ensures higher accuracy than previously reported
Keywords :
biomedical equipment; blood pressure measurement; patient monitoring; servomechanisms; 100 Hz; 25 Hz; Navicon; air-filled miniature bellows; arterial pressure waveform; closed-loop response; compressible air-space servocontroller; finger artery cross-section; frequency response; high-fidelity reproduction; inflatable cuff; instantaneous blood pressure monitor; linear motor; noninvasive monitor; photoelectric source/detector pair; pressure servocontroller; voice-coil armature; Arteries; Bellows; Biomedical monitoring; Blood pressure; Detectors; Fingers; Frequency response; Pressure control; Servomotors; Signal detection;
Conference_Titel :
Computers in Cardiology 1993, Proceedings.
Conference_Location :
London
Print_ISBN :
0-8186-5470-8
DOI :
10.1109/CIC.1993.378481
