Szivek Ja, Nandakumar Vs, Geffre Cp, Townsend Cp
Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Arizona, Tucson, AZ.
J Med Device. 2008 Sep 1;2(3):350011-350019. doi: 10.1115/1.2952815.
In vivo measurement of loads and pressures acting on articular cartilage in the knee joint during various activities and rehabilitative therapies following focal defect repair will provide a means of designing activities that encourage faster and more complete healing of focal defects.It was the goal of this study to develop a totally portable monitoring system that could be used during various activities and allow continuous monitoring of forces acting on the knee. In order to make the monitoring system portable, a handheld computer with custom software, a USB powered miniature wireless receiver and a battery-powered coil were developed to replace a currently used computer, AC powered bench top receiver and power supply.A Dell handheld running Windows Mobile operating system(OS) programmed using Labview was used to collect strain measurements. Measurements collected by the handheld based system connected to the miniature wireless receiver were compared with the measurements collected by a hardwired system and a computer based system during bench top testing and in vivo testing. The newly developed handheld based system had a maximum accuracy of 99% when compared to the computer based system.
在局灶性缺损修复后的各种活动及康复治疗过程中，对膝关节内作用于关节软骨的负荷和压力进行体内测量，将为设计能促进局灶性缺损更快、更完全愈合的活动提供一种方法。本研究的目标是开发一种完全便携式监测系统，该系统可在各种活动期间使用，并能持续监测作用于膝关节的力。为使监测系统便于携带，开发了一款带有定制软件的手持计算机、一个USB供电的微型无线接收器和一个电池供电的线圈，以取代目前使用的计算机、交流供电的台式接收器和电源。一台运行Windows Mobile操作系统（OS）并使用Labview编程的戴尔手持设备用于收集应变测量数据。在台式测试和体内测试期间，将基于手持设备连接微型无线接收器的系统所收集的测量数据与硬连线系统和基于计算机的系统所收集的测量数据进行比较。与基于计算机的系统相比，新开发的基于手持设备的系统最大准确率为99%。
