BRIGE: Patterned Microtexture to Create Fluid Film Lubrication at Low Sliding Velocities in Prosthetic Knee Joints

BRIGE：图案化微纹理可在假肢膝关节中以低滑动速度产生液膜润滑

• 批准号: 1227869
• 负责人: Bart Raeymaekers
• 金额: $ 17.46万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-08-15 至 2016-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1227869&HistoricalAwards=false
• 关键词: BRIGE; Patterned; Microtexture; Create; Fluid

This Broadening Participation Research Initiation Grant in Engineering (BRIGE) grant provides funding for the design of prosthetic knee implant bearing surfaces with a patterned microtexture. The primary goal of this research is to extend implant durability compared to state-of-the-art smooth implants by creating hydrodynamic lubrication at low joint sliding velocities to reduce friction and wear. A model of the sliding components of a prosthetic knee joint with patterned microtexture will be implemented using a finite difference formulation. The defining parameters of the microtexture will be optimized to maximize the bearing load carrying capacity and the separation between the bearing surfaces. The model will account for the non-Newtonian nature of the lubricant (synovial fluid) and the variable spacing between the bearing surfaces during gait. Laser surface texturing will be used to fabricate the patterned microtexture. A prototype prosthetic knee implant with an optimized, patterned microtexture design will be built to validate the model and experimentally compare friction and wear of microtextured and smooth prosthetic knee bearing surfaces.This study will provide critical insight on the effect of microtexture for the transition from boundary lubrication to hydrodynamic lubrication at low, variable sliding velocities in the presence of a non-Newtonian lubricant. Specifically, the results of this research will contribute to improving the durability of bearing surfaces of prosthetic knee implants by drastically reducing friction and wear. This could mark the beginning of a new generation of prosthetic implants with much improved durability, to serve an aging population and reduce health care costs. By extension, this research will also apply to reducing friction and wear in other implants, such as hip and shoulder implants. During this project, participation of students from underrepresented groups will be promoted through K-12 outreach and undergraduate research. An interactive module and curriculum related to friction will be contributed to the annual Hi-GEAR camp at the University of Utah for female high school students. Additionally, a demo-kit will be part of the Discover Engineering Display, which visits high schools in the Salt Lake City metro area.

这项扩大参与工程研究启动基金（bridge）为设计具有图案微纹理的假膝植入物承载表面提供资金。这项研究的主要目标是通过在低关节滑动速度下创造流体动力润滑来减少摩擦和磨损，从而延长植入物的耐用性，而不是最先进的光滑植入物。一个具有图案微纹理的假体膝关节滑动部件的模型将使用有限差分公式实现。将对微织构的定义参数进行优化，以最大限度地提高轴承承载能力和轴承表面之间的分离。该模型将考虑润滑剂（滑液）的非牛顿性质和步态中轴承表面之间的可变间距。激光表面纹理将用于制造图案微纹理。将构建具有优化的、有图案的微纹理设计的假膝植入物原型来验证模型，并通过实验比较微纹理和光滑假膝承载表面的摩擦和磨损。这项研究将为在非牛顿润滑剂存在的低、可变滑动速度下从边界润滑过渡到流体动力润滑的微纹理的影响提供关键的见解。具体来说，本研究的结果将有助于通过大幅减少摩擦和磨损来提高假膝植入物承载表面的耐久性。这可能标志着新一代耐用性大大提高的假体植入物的开始，以服务于老龄化人口并降低医疗保健成本。通过扩展，这项研究也将适用于减少其他植入物的摩擦和磨损，如髋关节和肩部植入物。在这个项目中，来自弱势群体的学生的参与将通过K-12外展和本科研究来促进。一个与摩擦相关的互动模块和课程将被贡献给犹他大学为女高中生举办的年度Hi-GEAR夏令营。此外，一个演示套件将成为探索工程展示的一部分，该展示将参观盐湖城都会区的高中。