Patent ID: 8425420

Claim:
A bone strength diagnosing device for diagnosing a bone strength using an ultrasonic wave, comprising: a speed-of-sound measuring device for radiating an ultrasonic wave onto a front surface of a bone, and measuring a first speed of sound of the ultrasonic wave propagating on the front surface of the bone along a first direction that intersects with a longitudinal direction of the bone; a second speed of sound of an ultrasonic wave propagating along a second direction parallel to the longitudinal direction of the bone; and a cortical bone thickness of the bone; a first index calculating device for calculating a first index related to a bone density using the speed of sound in the first direction measured by the speed-of-sound measuring device; a second index calculating device for calculating a second index related to an orientation of the bone using the speed of sound in the second direction and the speed of sound in the first direction measured by the speed-of-sound measuring device; a third index calculating device for calculating a third index related to the bone strength using the cortical bone thickness measured by the speed-of-sound measuring device; and a bone diagnosing device for diagnosing the bone strength based on the first index related to the bone density, the second index related to the bone orientation, and the third index related to the bone strength.