Results 211 to 220 of about 12,927 (254)

Calibrated impedance plethysmograph

American Journal of Physiology-Heart and Circulatory Physiology, 1980
The accuracy of quantitative pulse-volume measurement with a calibrated electrical impedance plethysmograph was determined on a laboratory limb-segment model. Changes in electrical impedance detected via a tetraprolar electode configuration were related to pulse-volume changes by the parallel-impedance model described by Nyboer et al.
M R, Yablonski, J M, Van De Water, B E, Mount, E D, Laska, R B, Indech   +4 more
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A Vaginal Plethysmograph System

Psychophysiology, 1975
ABSTRACTA vaginal plethysmograph system utilizing an indirectly (reflected) lighted photocell probe has been developed and used experimentally with excellent results. While the standard lamp and photocell plethysmograph using transmitted light is not unique, its application in measuring vaginal blood volume presented numerous instrumentation and ...
G, Sintchak, J H, Geer
openaire   +2 more sources

Automated venous occlusion plethysmograph

Medical & Biological Engineering & Computing, 1988
A self-contained automated system for venous occlusion plethysmography is described. The system is microprocessor controlled and performs the complete venous occlusion plethysmographic process of measurement, analysis and printout of results at the command of two keypresses on a keypad. Limb circulation is modelled by a linear model. Limb volume change
A M, Sinton, A D, Seagar, F M, Davis
openaire   +2 more sources

Automated strain-gauge plethysmograph

Medical & Biological Engineering & Computing, 1978
An automatic 2-channel strain-gauge plethysmograph, based on an absolute resistance measurement technique, will be described in the paper. This device is compact, easy to use, provides inherent self-calibration for any gauge and any length of that gauge, automatically performs the measured cycle, and generates annotated graphical printouts of the ...
M G, Taylor, B A, Coghlan, M G, Beasley, D H, King   +3 more
openaire   +2 more sources

Automated limb blood flow plethysmograph

American Journal of Physiology-Heart and Circulatory Physiology, 1983
An automated limb blood flow plethysmograph has been developed and interfaced to a PDP-11/60 computer. This system automatically inflates blood pressure cuffs, calibrates strain gauges, provides real-time display of limb circumference changes, and provides digital output of limb blood flow and real-time graphic display of cuff pressure. The system has
R R, Marcus, S M, Horvath
openaire   +2 more sources

A direct reading capacitance plethysmograph

Medical & Biological Engineering, 1970
An improved capacitance system for blood flow measurement by venous occlusion plethysmography is described. It is shown both theoretically and experimentally, that the change in the capacitance between the surface of the segment and an encircling flexible screen cuff at a fixed distance from the skin is related to the fractional change in volume of the
J R, Wood, C, Hyman
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Plethysmographic specific airway resistance

Paediatric Respiratory Reviews, 2006
sRaw measurements are feasible in children from 2 years of age. sRaw allows clinical monitoring and research during this critical period of growth and development in early life. sRaw measurements promise to bridge the gap of lung function measurements between infancy and school age.
openaire   +2 more sources

Multifrequency impedance plethysmograph

Quality Measurement: The Indispensable Bridge between Theory and Reality (No Measurements? No Science! Joint Conference - 1996: IEEE Instrumentation and Measurement Technology Conference and IMEKO Technical Committee 7. Conference Proceedings, 2002
The multifrequency impedance plethysmograph is achieved by sequentially changing the drive current and measuring the resultant voltages at each frequency. The change in frequency is made so fast that physiological events are considered steady. The measured voltage is demodulated digitally.
J. Wtorek, A. Polinski
openaire   +1 more source

Plethysmographic studies in atherosclerosis obliterans

The American Journal of Cardiology, 1960
Abstract The abnormalities of digital pulse volume in a series of twenty-two patients with atherosclerosis obliterans of the lower limbs are reported. After a correlation between arteriographic and plethysmographic findings, three types of abnormalities are distinguished in the pulse volume contour: Grade 1: the peak is rounded, dicrotic phenomena ...
openaire   +3 more sources

Evaluation of venous occlusion plethysmograph

Journal of Applied Physiology, 1961
Inflow and outflow, occlusion and perfusion pressures, and pressure in a small vein in the paw were measured simultaneously with the plethysmogram on the amputated forepaws of dogs. Venous tamponade was complete for a period of time dependent on the height of occlusion pressure and the magnitude of arterial flow.
M C, CONRAD, H D, GREEN
openaire   +2 more sources