Patent ID: 9468581
Filing Date: 2016-10-18
CPC Classification: A61B,A61H

Claim Text:
1. A compression depth calculation system configured to calculate a compression depth as a magnitude of a depression of a compressed object generated by compression, the compression depth calculation system comprising: a measuring apparatus configured to be mounted on the object, and a compression depth calculation apparatus configured to calculate the compression depth on the basis of information from the measuring apparatus, wherein the measuring apparatus includes: an acceleration sensor configured to detect an acceleration of a movement of a compressed portion of the object; and a magnetic sensor or a pressure sensor configured to output information according to the magnitude of compression with respect to the compressed portion of the object, and the compression depth calculation apparatus includes: a memory unit configured to memorize information, a second-order differential waveform creating unit configured to create a second-order differential waveform as a waveform of an acceleration of the movement of the compressed portion by performing second-order differential on the information acquired from the magnetic sensor or the pressure sensor; a waveform comparing unit configured to compare the created second-order differential waveform and an acceleration waveform on the basis of acceleration information acquired from the acceleration sensor to output a result of comparison; and a calculating unit configured to calculate a ratio of the acceleration waveform on the basis of the acceleration information with respect to the created second-order differential waveform as a coefficient of transformation on the basis of the output result of comparison; create a displacement waveform as a waveform of displacement of the movement of the compressed portion by multiplying the information acquired from the magnetic sensor or the pressure sensor by the calculated coefficient of transformation; and calculate the compression depth on the basis of the created displacement waveform.