Electro cardiograph date slide rule

摘要

The device is in the form of a mechanical slide rule. It has a main body 1 with one printed scale 10 for heart rate 10, a scale 12 for the R-R interval and another scale 13 for the R pulse amplitude in milli volts. The sliding section 3 scale and adjacent scale 6 are in logarithmic form and allow the quotient value of the longest to the shortest R-R interval to be determined. Alternatively the device is electronic and solar powered. The device has a LCD display with a bar graph scale corresponding to the marking fields (7,8).