Total hip joint prosthesis for in vivo measurement of forces and moments
Total hip joint prosthesis for in vivo measurement of forces and moments
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DOI：
10.1016/j.medengphy.2009.10.003
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发表时间：
2010-01-01
影响因子：
2.2
通讯作者：
Bergmann, Georg
中科院分区：
文献类型：
--
作者：
Damm, Philipp;Graichen, Friedmar;Bergmann, Georg
开发了一种新的人工髋关节，可以在体内测量关节中的完整接触载荷，即3个力和3个力矩分量。一个经临床验证的标准种植体被修改。空心颈内装有6片半导体应变片，用于测量颈的变形。还集成了一个小线圈的感应电源和一个9通道遥测发射机。颈腔用钛板封闭，电子束焊接密封。传感器信号采用脉冲间隔调制（PIM），采样率约为120hz。脉冲通过陶瓷头内的一个小天线环路以无线电频率传输，该天线环路通过两针馈通连接到电子电路。由外部设备进行感应供电，根据测量的变形量计算负载并实时显示负载。负载元件的最大误差为2%，包括串扰。(c) 2009年度。Elsevier Ltd.出版。版权所有。
A new instrumented hip joint prosthesis was developed which allows the in vivo measurement of the complete contact loads in the joint, i.e. 3 force and 3 moment components. A clinically proven standard implant was modified. Inside the hollow neck, 6 semiconductor strain gauges are applied to measure the deformation of the neck. Also integrated are a small coil for the inductive power supply and a 9-channel telemetry transmitter. The neck cavity is closed by a titanium plate and hermetically sealed by electron beam welding. The sensor signals are pulse interval modulated (PIM) with a sampling rate of about 120 Hz. The pulses are transmitted at radio frequencies via a small antenna loop inside the ceramic head, which is connected to the electronic circuit by a two-pin feedthrough. Inductive power supply, calculation of the loads from the measured deformations and real time load display are carried out by the external equipment. The maximum error of the load components is 2% including crosstalk. (C) 2009 IPEM. Published by Elsevier Ltd. All rights reserved.