Computer controlled hydraulic resistance device for a...

A - Human Necessities – 61 – F

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A61F 2/74 (2006.01) A61F 2/64 (2006.01) A61F 2/68 (2006.01) F16F 9/46 (2006.01) A61F 2/70 (2006.01) A61F 2/76 (2006.01)

Patent

CA 2232512

A computer controlled hydraulic resistance device for apparatus such as a prosthetic knee for above knee amputees, includes a solenoid actuated valve connected to control the flow of hydraulic fluid to and from a hydraulic actuator which applies resistance to the prosthetic knee or other apparatus through a coupling. Hydraulic pressure is sensed on the high and low side of the actuator and is used by a micro- controller in a closed-loop manner to compensate automatically for variations in the device and in the hydraulic fluid viscosity. The device also senses the position of the apparatus and feedsback to the micro-controller for applying a predetermined resistance profile to the apparatus.

L'invention porte sur un dispositif de résistance hydraulique automatisé utilisé dans des appareils, comme une prothèse de cuisse pour les amputés au-dessus du genou. Le dispositif comporte un électrorobinet relié de façon à commander l'écoulement de fluide hydraulique se rendant à l'actionneur hydraulique, et en revenant, qui applique une résistance à la prothèse de cuisse ou à un autre appareil au moyen d'un raccord. La pression hydraulique est détectée du côté supérieur et inférieur de l'actionneur; un microcontrôleur s'en sert en boucle fermée pour compenser automatiquement les variations du dispositif et de la viscosité du fluide hydraulique. Le dispositif détecte également la position de l'appareil et renvoie l'information au microcontrôleur afin de donner un profil de résistance prédéterminé à l'appareil.

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