权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Impact Biomechanics for Prevention of Sports Injuries and Development of Biomaterials for High Impact Absorption

用于预防运动损伤的冲击生物力学和高冲击吸收生物材料的开发

基本信息

批准号：
10480008
负责人：
TSUTSUMI Sadami
金额：
$ 8.13万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

The objectives of this project were to evaluate biomechanically the protective equipments such as mouth guards or headgears for prevention of sports injuries like concussion of the brain, and to develop a new polymer for high impact energy absorption.The finite element analysis method and MADYMO were jointly utilized for the impact analyses. The ability of cushioning by the mouth guard for the stroke to the lower jaw was sufficiently accepted, and especially it was effective for the stroke in the opening of the mouth. This damping effect was able to be confirmed from the propagation condition of the acceleration to the cheekbone in stroke test by the pendulum to the chin in 5 volunteers.Since the PVA gel is safe for the human body and has high water content and high modulus, we selected it as a high shock absorption gel with excellent durability. However, it is necessary to compose the chemical compounds which are excellent in water retentiveness, because the water in PVA is easy to scatter, and then it can be used as protective equipment which is excellent in the biocompatibility. Here, PVA gelation synthetic method using the organic solvent was devised. 30wt% PVA of 8800 degree of polymerization (DOP) was frozen to gel formation using the organic solvent adjusted in water : DMSO=2:8, and the PVA gel became high in homogeneity and Young's modulus. In replacing the organic solvent by the ethanol, the law DOP (1700) PVA sample was frozen to enhance the gelation. The high DOP (8800) sample was pushed out at 140℃ and several hundred atm, and the molding was carried out, then frozen to the gelation. By this method, 20-40% high-dense PVA gel was obtained. The elongation percentage over 100% was obtained, though this PVA gel has the high Young's modulus, and unloaded hysteresis loop showed good absorption property for the resistant impact, after it was extended to 80%.

本研究的目的是对用于预防脑震荡等运动损伤的防护设备（如护齿器或头盔）进行生物力学评估，并开发一种新型的高冲击能量吸收聚合物，将有限元分析方法和MADYMO结合用于冲击分析。护齿器对下颌击球的缓冲能力被充分接受，特别是对张口击球有效。在5名志愿者的下巴摆锤的冲击试验中，从加速度向颧骨的传播情况可以确认这种减震效果。由于PVA凝胶对人体安全，并且含水量高，模量高，因此选择了耐久性优异的高减震凝胶。然而，由于PVA中的水容易分散，因此需要合成保水性优异的化合物，然后可以将其用作生物相容性优异的防护设备。这里，设计了使用有机溶剂的PVA凝胶化合成方法。使用调节为水：DMSO=2：8的有机溶剂，将聚合度（DOP）为8800的30wt%PVA冷冻成凝胶，并且PVA凝胶的均匀性和杨氏模量变高。在用乙醇代替有机溶剂的情况下，将DOP（1700）法PVA样品冷冻以增强凝胶化。将高DOP（8800）样品在140℃、几百个大气压下推出，进行成型，然后冷冻至凝胶。通过该方法，获得了20-40%的高密度PVA凝胶。该PVA凝胶虽然具有较高的杨氏模量，但其拉伸率仍超过100%，当拉伸到80%时，无载滞后回线表现出良好的抗冲击吸收性能。