| Summary: | 碩士 === 中原大學 === 醫學工程研究所 === 92 === There are very few mid-frequency electrical stimulators available in the market, and their mid-frequency waveforms are mostly modulated by low frequency sinewaves, which do not have much effect to the human body. Most domestic or imported electrical stimulators use knob to adjust the parameters, which lack of a quantified data.
The purpose of this research was to construct a mid-frequency electrical stimulator with modulated different frequencies. The <a href="http://www.ntsearch.com/search.php?q=design&v=56">design</a> of the system used low frequency square wave to create mid-frequency wave, which is stronger in intensity and more effective when stimulating human. It also was more comfortable to patients. In order to avoid unstable intensity of the stimulator, the research modified the knob to digital controllers. The output current characterisics were also adjusted to the ranges that are suitable for clinical use.
After the development of the new system, it was tested to ensure the safely of the system. Evaluation was then made by treating patients with either <a href="http://www.ntsearch.com/search.php?q=tennis&v=56">tennis</a> elbow or upper <a href="http://www.ntsearch.com/search.php?q=back pain&v=56">back pain</a>. The change of Ryodoraku values and the VAS values in the patients before and after the electrical stimulation were compared.
The results of the research showed that the output characteristics of the system were all in safe ranges and had more functions. Another finding was that patients with <a href="http://www.ntsearch.com/search.php?q=tennis&v=56">tennis</a> elbow all felt the soothingness after either 2Hz or 100Hz modulated middle-frequencies electrical stimulation. Also the VAS values were decreased (p<0.01). This demonstrated that the two stimulating characteristics had clinical effectiveness. The 2Hz modulated middle-frequency wave showed a significant decrease in the meridian 12 Ryodoraku values (p<0.05). The 100Hz frequency modulated middle-frequency wave showed a significant increase in the 12 meridian Ryodoraku values (p<0.05).
Patients with upper <a href="http://www.ntsearch.com/search.php?q=back pain&v=56">back pain</a> also felt the soothingness after either 2Hz or 100Hz modulated middle-frequency electrical stimulation. The VAS values also showed a meaningful decrease. Patients who were treated with 2Hz or 100 Hz modulated middle-frequency waves also had a signficant decrease (p<0.01) in their 12 meridian Ryodoraku values.
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