A Low-Cost Bioimpedance Phase Angle Monitor for Portable Electrical Surface Stimulation Burn Prevention
A Low-Cost Bioimpedance Phase Angle Monitor for Portable Electrical Surface Stimulation Burn Prevention
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DOI：
10.1109/tcsii.2020.3029372
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发表时间：
2021-04-01
影响因子：
4.4
通讯作者：
Fu, Michael J.
中科院分区：
文献类型：
--
作者：
Burns, Ryan P.;Dunning, Jeremy;Fu, Michael J.
皮肤表面电刺激具有广泛的临床应用和家庭使用，但皮肤烧伤是一种风险，现有的设备不能监测电极部位的皮肤损伤或电极连接不当。当发生烧伤时，皮肤表面阻抗的低频相位改变。本简报描述了一种新型模拟处理技术，适用于检测便携式电刺激设备使用过程中的皮肤表面相位变化。输出为1位信号，指示相位是否已改变超过预定量，从而允许系统并入具有有限处理能力的低成本装置中。使用电流源双极方波刺激信号进行计算模拟。一个近似的皮肤表面阻抗的相位变化转换为电压，被发现有14.1%的平均误差。由于使用模拟技术，相位超过允许阈值与输出设置为高电平之间存在232.48 ms的传播延迟。这些初步的模拟结果为开发更安全的便携式皮肤表面电刺激器的可行性提供了证据，这些电刺激器可以在临床或家庭使用期间监测和防止皮肤损伤。
Electrical skin-surface stimulation has wide clinical adoption and home use, but skin burns are a risk and existing devices do not monitor the electrode sites for skin damage or improperly connected electrodes. When a burn occurs, the low frequency phase of the skin surface impedance changes. This brief describes a novel analog processing technique that is suitable for detecting skin surface phase changes during the use of portable electrical stimulation devices. The output is a 1-bit signal indicating if the phase has changed by more than a predetermined amount, allowing the system to be incorporated into low-cost devices with limited processing capability. Computational simulations were performed using a current-sourced bipolar square-wave stimulation signal. An approximation is presented which converts a phase change in the skin-surface impedance to a voltage, which was found to have an average error of 14.1%. Due to the analog techniques used, there is a propagation delay of 232.48 ms between the phase exceeding the allowable threshold and the output being set to HIGH. These initial simulation results provide evidence for the feasibility of developing safer portable skin surface electrical stimulators that can monitor and prevent skin injury during clinical or home use.