Abu-Faraj Z O, Harris G F, Abler J H, Wertsch J J, Smith P A
Department of Biomedical Engineering, Marquette University, Milwaukee, WI 53233, USA.
IEEE Trans Rehabil Eng. 1996 Mar;4(1):33-8. doi: 10.1109/86.486055.
A multichannel, portable data acquisition system has been developed to measure discrete plantar pressures in the rehabilitation of children who have cerebral palsy and planovalgus foot deformity. The microprocessor-based system is designed to be lightweight (350 g with batteries) and portable (no umbilicus) in order to minimize encumbrances to gait patterns. It provides an improved method for obtaining accurate and reliable data during extended recording and rehabilitative periods that is not available from commercial systems. Twelve conductive polymer force (pressure) sensors are used to acquire pressure data, which are then stored in the system memory. Plantar pressures are sampled at a rate of 40 Hz from each of the 12 sensors for up to 2 h. The system consists of 16 analog amplifiers, a 12 b sampling analog-to-digital converter, an 8 b Dallas semiconductor microprocessor (DS5001FP-16, Dallas, TX), 4 MB of pseudo static RAM, and serial and parallel I/O interfaces. The interfaces are used to upload data into a PC for further processing, analysis, and display. During subject testing, sensors are located at predetermined anatomic areas under the calcaneus, medial and lateral midfoot, medial and lateral metatarsal heads, and hallux. Foot pressure data has been acquired from two pediatric subjects during multiple walking trials to illustrate system application in the normal and planovalgus foot. The system is considered to be appropriate for further clinical application and for characterization of event related alterations including rehabilitative, therapeutic, surgical, and nonsurgical treatment.
已开发出一种多通道便携式数据采集系统，用于测量患有脑瘫和扁平外翻足畸形儿童康复过程中的离散足底压力。基于微处理器的系统设计得轻巧（带电池时为350克）且便于携带（无脐带），以尽量减少对步态模式的阻碍。它提供了一种在长时间记录和康复期间获取准确可靠数据的改进方法，而商业系统无法做到这一点。十二个导电聚合物力（压力）传感器用于采集压力数据，然后将其存储在系统内存中。从12个传感器中的每一个以40Hz的速率对足底压力进行采样，最长可达2小时。该系统由16个模拟放大器、一个12位采样模数转换器、一个8位达拉斯半导体微处理器（DS5001FP - 16，得克萨斯州达拉斯）、4MB的伪静态随机存取存储器以及串行和并行I/O接口组成。这些接口用于将数据上传到个人计算机进行进一步处理、分析和显示。在受试者测试期间，传感器位于跟骨、足中内侧和外侧、跖骨头内侧和外侧以及拇趾下方的预定解剖区域。在多次步行试验中从两名儿科受试者获取了足部压力数据，以说明该系统在正常足和扁平外翻足中的应用。该系统被认为适用于进一步的临床应用以及对包括康复、治疗、手术和非手术治疗在内的事件相关改变进行表征。
