Lakes R S, Saha S
Med Instrum. 1978 Mar-Apr;12(2):106-9.
A noncontacting, electromagnetic device to monitor stress waves in bone has been developed. Since bone exhibits piezoelectric-like behavior, a propagating stress wave in bone generates both electric and magnetic fields. The present device detects the magnetic field and thus provides a measure of the stress-wave amplitude in the bone. Excised dry and wet human femora, as well as a model system consisting of a bar of strongly piezoelectric ceramic, were examined using the device. Magnetic signals associated with elastic waves were also recorded in the long bones of human volunteers. Since the observed signals are not perturbed by the mechanical quality of the soft tissue over the bone, the device may be used to quantitatively assess the mechanical properties of bone in vivo.
一种用于监测骨中应力波的非接触式电磁装置已被研发出来。由于骨呈现出类似压电的行为，骨中传播的应力波会产生电场和磁场。当前装置检测磁场，从而提供骨中应力波振幅的一种度量。使用该装置对切除的干燥和湿润人体股骨以及由一块强压电陶瓷棒组成的模型系统进行了检测。在人类志愿者的长骨中也记录到了与弹性波相关的磁信号。由于所观察到的信号不受骨上方软组织机械质量的干扰，该装置可用于在体内定量评估骨的力学性能。
