Rancang Bangun Sistem Pengendali Tegangan Stimulasi Elektrostimulator Otomatis Berbasis Resistansi Tubuh

Adi Prasetyo Hutomo, Suhariningsih Suhariningsih, Suryani Dyah Astuti

= http://dx.doi.org/10.20473/bsn.v20i3.Y2018.11879
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Pada penelitian ini, dibuat desain alat elektrostimulator yang mengeluarkan bentuk gelombang spike-eksponensial monofase. Sistem kontrol elektrostimulator dilakukan dengan menggunakan dua frekuensi dan enam belas tingkat tegangan keluaran dengan batas bawah sebesar 45 Volt dan batas atas sebesar 400 Volt. Penentuan tegangan stimulasi secara otomatis dilakukan dengan pengukuran nilai resistansi tubuh. Nilai resistansi tubuh yang dijadikan umpan balik sistem bergantung dari nilai frekuensi stimulasi yang diberikan. Penentuan nilai resistansi sebagai umpan balik sistem pada tiap frekuensi ditentukan dengan membagi nilai rerata nilai ambang sakit dengan rerata nilai resistansi, sehingga diperoleh arus stimulasi pada tiap frekuensi yaitu 0.01mA pada frekunsi 4 Hz dan 0.09 mA pada frekuensi 100 Hz. Berdasarkan VEff pada tiap tingkat pada masing-masing frekuensi dan arus stimulasi pada tiap frekuensi tersebut maka dapat ditentukan nilai resistansi pada tiap tingkat pada tiap frekuensi yang akan dijadikan sebagai umpan balik sistem. Elektrostimulator ini memiliki ketepatan penentuan tegangan stimulasi dengan error pungukuran resistansi tubuh sebesar 1%. Studi yang telah dilakukan menunjukan bahwa alat elektrostimulator yang diwujudkan memiliki akurasi yang baik dan memiliki keuntungan di nilai tegangan puncak yang tinggi dan arus efektif yang rendah, sehingga dapat dipertimbangkan karena memberikan kenyamanan dan keamanan pada peralatan terapi medis.


Kata kunci Elektrostimulator, Elektrostimulator Otomatis, Otomatiasasi Tegangan Stimulasi

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