Electrocardiogram caliper

Details Electrocardiogram caliper Electrocardiogram caliper

1981-08-24

1983-06-21

Martin, Jr., William D.

Geometrical instruments

Miscellaneous

Light direction

33148E, 33149R, G01B 502

Patent

active

043887597

ABSTRACT:
A caliper calibrated for the direct reading of electrocardiogram tracings. Each arm of the caliper is calibrated and is read by indexing the calibration against a curved index line on the opposite arm which is varied by the spacing between the caliper points. One such calibration represents the duration in seconds of the various deflections or complexes and a second calibration represents the amplitudes of a deflection in millivolts. On the reverse side of the caliper, an arm is calibrated to indicate frequency in deflections per minute between adjacent similar deflections or a count between three such intervals. A pair of coaxial calibrated discs attached for rotation about the caliper pivot provides a rapid and accurate means for the determination of mean vector and therefore axis deviation.

REFERENCES:
patent: 1299978 (1919-04-01), MacDowney
patent: 1317879 (1919-10-01), Kramer
patent: 2501550 (1950-03-01), Tamagna et al.
patent: 3126639 (1964-03-01), Larson et al.
patent: 3733708 (1973-05-01), Goodman

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