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首页> 外文期刊>Journal of medical engineering & technology >A multi-channel stimulator and electrode array providing a rotating current whirlpool for electrical stimulation of wounds.
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A multi-channel stimulator and electrode array providing a rotating current whirlpool for electrical stimulation of wounds.

机译：一种多通道刺激器和电极阵列，提供旋转电流漩涡以电刺激伤口。

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摘要

When electrical stimulation is used on wounds, the electrical current has difficulty penetrating areas where there is necrotic tissue. Further, for an irregularly shaped wound, current distribution is poor in some areas of the wound since conventional two-electrode delivery systems provide the greatest current in a line directly between the electrodes. A new stimulator and electrode system is described which uses three electrodes spaced around a wound to disperse current more evenly. The stimulator senses tissue impedance and then redirects current by altering its Thevenin's output impedance for each electrode; each of the three electrodes becomes the active one in sequence while the remaining are the sink electrodes. Eight subjects were examined to test the stimulator. Electrical stimulation was applied to the skin above the quadriceps muscle at currents of 15 mA in six subjects without wounds and in two subjects with wounds. The relationship between electrode position and current dispersion on the skin was examined with a two-electrode vs. a three-electrode system to set stimulation parameters for the computer. The results showed that the three-electrode system could (1) detect areas of the skin with high impedance; (2) compensate by altering the Thevenin's output impedance at each of the three electrodes to shift current to high impedance areas; (3) provide uniform current across the skin as assessed by skin current and blood flow measurements with a laser Doppler flow imager.
机译：当在伤口上使用电刺激时，电流难以穿透坏死组织的区域。此外，对于不规则形状的伤口，由于常规的两电极递送系统在直接在电极之间的线路中提供最大的电流，因此在伤口的某些区域中的电流分布较差。描述了一种新的刺激器和电极系统，其使用在伤口周围间隔开的三个电极以更均匀地分散电流。刺激器感应组织阻抗，然后通过改变每个电极的戴维宁输出阻抗来重定向电流。三个电极中的每个电极依次变为活动电极，其余电极为沉电极。检查了八名受试者以测试刺激器。在六个无伤口的受试者和两个有伤口的受试者中，以15 mA的电流对四头肌上方的皮肤施加电刺激。用两电极与三电极系统检查电极位置与皮肤上电流分散之间的关系，以设置计算机的刺激参数。结果表明，三电极系统可以（1）检测高阻抗皮肤区域; （2）通过改变三个电极上的戴维宁的输出阻抗来补偿，以将电流转移到高阻抗区域; （3）用激光多普勒血流成像仪通过皮肤电流和血流测量来评估皮肤上的均匀电流。

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