Implantable 9-channel telemetry system for in vivo load measurements with orthopedic implants
Implantable 9-channel telemetry system for in vivo load measurements with orthopedic implants
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DOI：
10.1109/tbme.2006.886857
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发表时间：
2007-02-01
影响因子：
4.6
通讯作者：
Bergmann, Georg
中科院分区：
文献类型：
--
作者：
Graichen, Friedmar;Arnold, Ruediger;Bergmann, Georg
了解骨科植入物所承受的载荷是其最佳生物力学设计、长期成功和改善康复结果的基本先决条件。体内负荷测量比使用数学肌肉骨骼模型获得的测量更准确。植入物内部的感应供电集成电路可测量六个负载组件以及温度和供电电压。该低功耗电路包括一个 9 通道多路复用器、一个可编程存储器、一个脉冲间隔调制器和一个射频发射器。该集成电路与一些无源元件一起，采用厚膜混合技术安装在陶瓷基板上。传感器信号被多路复用、调制并传输到外部设备。外部设备的微控制器调节功率振荡器产生的交变磁场。同步脉冲间隔调制数据流。个人计算机实时显示力、力矩和温度。迄今为止，新型遥测发射器已用于三名肩关节假体患者的体内负荷测量。八个仪器化椎体替代物已准备好植入，一个仪器化胫骨托盘正在提交实验室测试。
Knowledge of the loads to which orthopedic implants are subjected is a fundamental prerequisite for their optimal biomechanical design, long-term success, and improved rehabilitation outcomes. In vivo load measurements are more accurate than those obtained using mathematical musculoskeletal models. An inductively powered integrated circuit inside the implant measures six load components as well as the temperature and supplied voltage. This low-power circuit includes a 9-channel multiplexer, a programmable memory, a pulse interval modulator, and a radio-frequency transmitter. Together with a few passive components, the integrated circuit is mounted on a ceramic substrate with thick-film hybrid technology. The sensor signals are multiplexed, modulated, and transmitted to an external device. The microcontroller of the external, device regulates the alternating magnetic field produced by a power oscillator and. synchronizes the pulse interval modulated data stream. A personal computer displays forces, moments, and temperatures in real time. The new telemetry transmitter has, thus far, been used for in vivo load measurements in three patients with shoulder endoprostheses. Eight instrumented vertebral body replacements are ready for implantation, and an instrumented tibial tray is being submitted to laboratory tests.