Engineering topics

Moody, D. L., Jr.

Publications and source records attributed to Moody, D. L., Jr..

3 records

NASA NTRS1977

An electrode system for tetrapolar electrical impedance plethysmography of the finger

A rigid band electrode system is described which facilitates location of the recording electrodes of a tetrapolar impedance plethysmograph used for measuring pulsations of blood in a finger segment. The electrodes can be relocated accurately, and the volume of the finger segment under study can be precisely defined. The new system ensures good electrical contact and minimizes movement artifacts in the plethysmograph trace by holding the finger segment in a firm position.

Montgomery, L. D.↗

NASA NTRS1976

Readout electrode assembly for measuring biological impedance

The invention comprises of a pair of readout ring electrodes which are used in conjunction with apparatus for measuring the electrical impedance between different points in the body of a living animal to determine the amount of blood flow therebetween. The readout electrodes have independently adjustable diameters to permit attachment around different parts of the body between which it is desired to measure electric impedance. The axial spacing between the electrodes is adjusted by a pair of rods which have a first pair of ends fixedly attached to one electrode and a second pair of ends slidably attached to the other electrode. Indicia are provided on the outer surface of the ring electrodes and on the surface of the rods to permit measurement of the circumference and spacing between the ring electrodes.

Montgomery, L. D.↗

NASA NTRS1974

Finger recording electrode system for electrical impedance plethysmograph

System facilitates location of recording electrodes of impedance plethysmograph that is used for measuring flow of blood in finger segment; electrodes can be relocated accurately and volume of finger segment under study can be determined precisely. System minimizes movement artifacts in plethysmograph trace because finger segment is held firmly.

Montgomery, L. D.↗