Examinando por Materia "HEMIPARESIS"

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  • Miniatura
    PublicaciónAcceso abierto
    Development of an actuated cable orthotic glove to provide assistance of fi nger extension to stroke survivors
    (2014-04-23) Ochoa, J. M. (José Mauricio ); Kamper, D. (Derek)
    Se presenta el desarrollo de un guante activado externamente y controlado por un microprocesador para asistir la extensión de los dedos en pacientes con derrame cerebral. La meta del dispositivo es permitir la repetición de tareas específi cas para realizar terapia de la mano en un ambiente casero. El usuario puede controlar el dispositivo por tres medios diferentes: reconocimiento de voz, electromiografía o manualmente. Estos medios pueden ser usados tanto independientemente como en combinación según las necesidades del paciente. Para el control y la seguridad, se tiene retroalimentación de posición y de fuerza. Las pruebas iniciales del prototipo han demostrado un desempeño prometedor
  • Miniatura
    PublicaciónAcceso abierto
    Development of an electro-mechanically controlled hand orthosis for assisting finger extension in stroke survivors
    (2014-04-20) Villa-Bedoya, J. (Juliana); Petroff, N. (Neil)
    Stroke is the leading cause of long-term disability in the world. It causes chronic deficits, such as hemiparesis, especially prevalent in the distal upper extremities. An electro-mechanically driven hand orthosis has been developed to assess the potential therapeutic use of such devices in rehabilitating hand function. A small Direct Current (DC) brushed motor is used as the main actuator, and a cable-driven glove connected to the motor shaft is the central component of the device. The orthosis control is achieved through a force feedback loop using a miniature load cell attached in series to the cable and control module. The later, generates Pulse Width Modulated (PWM) and direction signals required to drive the motor. The speed is determined by the duty cycle of the PWM signal while the direction by the status of a flag bit modified by a user-operated switch. A portable design was achieved by using a 6 V battery pack as the power supply. The device is ready for use in clinical trials with stroke survivor subjects as it has already been tested on healthy individuals with satisfactory performance.