Abstract: The method of calibrating includes selecting discrete levels of cuff pressure and placing the artery under study at those discrete levels of induced pressure with a closed pneumatic cuff system, substantially continually sensing cuff pressures at each discrete level and thereby sensing blood volume change through the artery, electronically determining when a certain number of representative blood volume change signals are substantially equivalent, changing the volume in the closed pneumatic system at each discrete cuff pressure by a predetermined volumetric amount after determining substantial equivalency, and, correcting the blood volume change signal based upon the signals detected during the volume change of the closed pneumatic cuff system.

Abstract: The method of calibrating the volume plethysmograph designed to detect atherosclerosis includes selecting discrete levels of cuff pressure and placing the artery under study at those discrete levels of induced pressure with a closed pneumatic cuff system, substantially continually sensing cuff pressures at each discrete level and thereby sensing blood volume change through the artery, electronically determining when a certain number of representative blood volume change signals are substantially equivalent, changing the volume in the closed pneumatic system at each discrete cuff pressure by a predetermined volumetric amount after determining substantial equivalency, electronically generating a calibration signal or factor at each discrete cuff pressure based upon changed blood volume change signal and, correcting the blood volume change representative signal based upon the calibration signal or factor at each discrete level of pressure.

Abstract: The method of calibrating includes selecting discrete levels of cuff pressure and placing the artery or vein under study under discrete levels of induced pressure with a closed pneumatic system contained by the pressure cuff, substantially continually sensing cuff pressures at each discrete level and thereby sensing blood volume change through the artery, electronically determining when a certain number of representative time-based blood volume change signals are substantially equivalent, changing the volume in the closed pneumatic system at each discrete cuff pressure by a pre-determined volumetric amount after determining substantial equivalency, electronically generating a calibration signal at each discrete cuff pressure based upon the calibrated volume change and, correcting the blood volume representative signal based upon the calibration signal at each discrete level of pressure.

Abstract: The method of calibrating includes selecting discrete levels of cuff pressure and placing the artery or vein under study under discrete levels of induced pressure with a closed pneumatic system contained by the pressure cuff, substantially continually sensing cuff pressures at each discrete level and thereby sensing blood volume change through the artery, electronically determining when a certain number of representative time-based blood volume change signals are substantially equivalent, changing the volume in the closed pneumatic system at each discrete cuff pressure by a pre-determined volumetric amount after determining substantial equivalency, electronically generating a calibration signal at each discrete cuff pressure based upon the calibrated volume change and, correcting the blood volume representative signal based upon the calibration signal at each discrete level of pressure.

Abstract: The ventilation monitor of this invention includes a plurality of discrete sensors and a plurality of independent channels for processing the input signals from each of the discrete sensors. The principle category of sensor used in conjunction with this ventilation monitor is capable of the reception of information associated with breathing and cardiovascular movement. A second category of the sensor used in conjunction with this ventilation monitor is capable of the reception of audible sounds associated with breathing. Each of the individual input signals from these sensors is initially verified as being indicative of the sensation being monitored and, thereafter, compared in real time with one another and criteria stored within a microprocessor. The purpose of the comparison is to verify a normal breathing pattern and signal an alarm when the breathing pattern is abnormal.