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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Piezoelectric and Inversely Piezoelectric Responses of Bone Tissue Plates in the Megahertz Range
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Piezoelectric and Inversely Piezoelectric Responses of Bone Tissue Plates in the Megahertz Range

机译：Megahertz系列骨组织板压电和反向压电反应

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摘要

Piezoelectricity in bone is thought to be a mechanism by which ultrasound promotes the healing of bone fractures. However, a few studies have been conducted in the more clinically relevant megahertz range. To understand the piezoelectricity in bone, we fabricated ultrasound transducers using bone samples as piezoelectric materials and identified the longitudinal ultrasound radiation and reception in the megahertz range. The maximum transmitting sensitivity of the bone transducer was 140 mPa/V, which was nearly 1/1000 of a polyvinylidene difluoride (PVDF) transducer that has better electrical properties and piezoelectricity. The resonance frequencies of the transducer depend on the plate thickness and angle between the bone axis (alignment direction of the hydroxyapatite crystallites) and ultrasound propagation direction, reflecting the anisotropic character of the bone. The reception and transmission sensitivities of the bone transducers also depend on the plate thickness and angle, showing maximum values at off-axis angles. These results indicate the existence of both piezoelectricity and inverse piezoelectricity in bone, which may be key factors in understanding the bone healing by low-intensity biophysical (electrical or mechanical) stimulation.
机译：骨中的压电性被认为是超声波促进骨骨折愈合的机制。然而，在更临床相关的Megahertz范围内进行了一些研究。为了了解骨中的压电性，我们使用骨骼样品作为压电材料制造超声换能器，并确定了Megahertz范围内的纵向超声辐射和接收。骨换能器的最大传递灵敏度为140MPa / v，其聚偏二氟化乙烯（PVDF）换能器的聚偏二氟化物（PVDF）换能器具有较好的电性能和压电性。换能器的共振频率取决于骨轴（羟基磷灰石微晶的对准方向）和超声波传播方向之间的板厚度和角度，反映了骨的各向异性特征。骨换能器的接收和透射敏感性也取决于板厚度和角度，显示在轴外角处的最大值。这些结果表明骨中的压电性和反逆压电性的存在，这可能是理解低强度生物物理（电气或机械）刺激的骨愈合的关键因素。

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