Sistema de eletroestimulação portátil com oito síncronos
The use of electrical pulses for artificial reproduction movements, or Functional Electrical Stimulation (FES), is a consolidated technique for treating patients in rehabilitation. For this use, special instruments are employed to generate the signals, known as electrostimulators. This work describe...
| Autor principal: | Pepino, André Luiz Gonçalves |
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| Formato: | Dissertação |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2012
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/209 |
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| Resumo: |
The use of electrical pulses for artificial reproduction movements, or Functional Electrical Stimulation (FES), is a consolidated technique for treating patients in rehabilitation. For this use, special instruments are employed to generate the signals, known as electrostimulators. This work describes the development of a portable electrostimulator with eight independent and synchronous channels, allowing a temporal activation program of their channels and making it possible to reproduce artificial movements similar to real ones. The hardware of this device has small dimensions (115 mm X 162 mm X 43 mm) and generates biphasic electrical pulses with maximum amplitudes of ± 100 mA. The pulses have durations from 100 to 800 µs and frequency from 50 to 1000 Hz. Also, there is an interface with a touchscreen liquid crystal display (LCD) for user interaction with the embedded software, which is responsible for controlling the complete system. A desktop software was developed to generate stimulatory programs, containing a virtual simulator that, using a 3D human model, allows adjustments in the stimulatory program before running it on a patient. The instrument complies with the electrical standards of the ABNT relating to electromedical equipment for neuromuscular stimulation. In vitro tests were performed following the rules described in standards to ensure compliance of functioning, and the electrical pulses provided by the device. As a result, the device showed values within the standard limits of safety, excessive temperatures, accuracy of operating data, protection of incorrect output, and human errors. Also, ten volunteers participated of in vivo tests to validate the instrument. The in vivo tests consisted on a comparison of movement ranges obtained by the volunteers in reproduction of functional movements during the use of a commercial electrostimulator and the developed one. With a maximum error of 3%, the developed instrument was capable to perform functional movements, and thus may be useful in treatment of physical rehabilitation. |
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