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CPGEI (Mestrado) Paulo Henrique de Oliveira - 27/04/12

Defesa Pública de Mestrado do Programa de Pós-Graduação em Engenharia Elétrica e Informática Industrial
Quando 27/04/2012
das 10h00 até 12h00
Onde Sala I002 (Poty)
Nome do Contato Prof. Humberto R Gamba
Participantes Orientador:
Prof. Phuc Nguyen, Dr. - University of Applied Sciences-Mannheim
Prof. Humberto R Gamba, Dr. - UTFPR
Banca Examinadora:
Prof. Percy Nohama, Dr. - Presidente - UTFPR
Prof. Phuc Nguyen, Dr. - University of Applied Sciences-Mannheim
Prof. Albrecht Zwick, Dr, - Mannheim University
Prof. Gustavo Benvenutti Borba, Dr. - UTFPR
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A versatile current source for pulse therapies in low- and middle-frequency domains, including interferential current therapy.

Abstract: Electrical stimulation is an important tool in medicine with applications like muscle rehabilitation, pain management and pacemakers. Portable stimulation devices for home use are divided mainly in two domains: low and middle frequency therapies. Due to the absence of a system to provide both therapies at the same equipment, the main objective of this project was the development of a current source not only capable of that, but also able to generate arbitrary stimulation patterns controlled by an external microcontroller. Moreover, the system should enable interferential current therapy. The result of the project was an electronic device that triggered current stimulation patterns based on three control signals, which could be easily generated by a microcontroller. The system provided LF stimulation with balanced current pulses up to 80mA through 1kΩ load impedance, pulse duration between 50 and 1000μs, and frequencies up to 150Hz. It also provided MF stimulation outputs up to 100mApp, with a modulation frequency up to 4kHz and a simple interface for controlling the envelope waveform. It presented two galvanic isolated channels to enable interferential current therapy and, when no output current was intended, it was able to provide a short circuit on the load to remove possible net charges introduced by the system to the patient’s body. Additionally, a MATLAB application and a SPICE simulation were developed to assist the creation of control signals. As the system was able to deliver stimulation currents with an arbitrary pattern, it can be used to find the best pulse waveforms for a series of different applications involving electrical therapy.
Keywords: Electrical Skin Stimulation. LF Therapy. MF Therapy. Interferential Current Therapy. Current Source. Portable Stimulation Devices.

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