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Measurement of Bioelectric Current with a Vibrating Probe
Published on: January 4, 2011
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用于电压模式电刺激器的皮肤阻抗估计系统,配有交流桥电路
概括
这项研究开发了一个桥梁电路来估计神经肌肉电刺激的皮肤阻抗. 该电路准确地估计了皮肤阻抗,使电压模式刺激器能够有效地执行电流模式刺激.
科学领域:
- 生物医学工程 生物医学工程
- 神经科学是一个神经科学.
- 康复技术 康复技术 康复技术
背景情况:
- 神经肌肉电刺激 (NMES) 有助于四肢的运动功能,并预防中风患者的肌肉缩.
- NMES系统被分为电流模式或电压模式刺激器.
- 电压模式刺激器提供安全优势,减少电极脱离造成的烧伤风险.
研究的目的:
- 为了使电压模式刺激器能够通过准确估计皮肤阻抗来执行任意电流模式刺激.
- 设计和测试一个模拟皮肤阻抗的原型桥梁电路.
- 为了验证开发电路的准确性与已建立的阻抗测量技术相比.
主要方法:
- 使用阻抗分析仪,对6名受试者进行了电极-皮肤阻抗频率响应的特征.
- 确定了皮肤阻抗模拟并行电阻电容电路的频段.
- 设计,组装和测试了采用皮肤阻抗等效电路的原型桥梁电路.
- 在使用原型电路的3个受试者中估计皮肤阻抗,并将结果与阻抗分析仪测量结果进行比较.
主要成果:
- 确定了用于皮肤阻抗建模的特定频段.
- 原型桥梁电路成功估计了皮肤阻抗.
- 估计和测量阻力之间的残留值高达4.4%.
- 估计和测量电容之间的剩余值高达8.2%.
结论:
- 开发的桥梁电路有效地估计NMES应用的皮肤阻抗.
- 这项技术允许电压模式刺激器实现电流模式刺激能力.
- 精确的皮肤阻抗估计提高了NMES在中风康复中的安全性和有效性.
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