Electronically controlled prosthetic knee

Details Electronically controlled prosthetic knee Electronically controlled prosthetic knee

A - Human Necessities

61

F

A61F 2/68 (2006.01) A61F 2/64 (2006.01) A61F 2/70 (2006.01) A61F 2/74 (2006.01)

Patent

CA 2396617

The present invention relates to a variable-torque magnetorheologically actuated prosthetic knee (110, 210) which utilizes a plurality of interspersed and alternating rotors (120, 220) and stators (130, 230) to shear magnetorheological fluid (130) in gaps formed therebetween. Advantageously, by operating in the "shear mode" there is substantially no or negligible fluid pressure buildup or change. Moreover, the multiple MR fluid gaps or flux interfaces desirably allow for the production of a large torque at low speed without the use of a transmission and also for a wide dynamic torque range to be achieved and add to the versatility of the invention. One embodiment of the invention allows the rotors (120, 220) and/or stators (130, 230) to close the gaps therebetween to create a frictional torque component, thereby forming a "hybrid" braking system which provides a total torque or damping which is a combination of viscous torque and frictional torque.

La présente invention concerne un genou prothétique à couple variable actionné par voie magnétorhéologique (110, 210). Ce genou utilise une pluralité de rotors (120, 220) et de stators (130, 230) intercalés et alternants pour cisailler un fluide magnétorhéologique (130) dans des espaces intermédiaires. Avantageusement, dans le "mode cisaillement", l'accumulation ou la modification de pression fluidique est sensiblement nulle ou négligeable. De plus, les nombreux espaces de fluide magnétorhéologique ou interfaces de flux permettent de produire un couple important à une faible vitesse sans utilisation d'une transmission, et d'obtenir une large plage de couple dynamique, ce qui ajoute à la polyvalence de cette invention. Dans un mode de réalisation de l'invention, les rotors (120, 220) et/ou les stators (130, 230) peuvent fermer les espaces intermédiaires de façon à créer un composant de couple de frottement, d'où la formation d'un système de freinage hybride offrant un amortissement ou un couple total résultant d'une combinaison d'un couple visqueux avec un couple de frottement.

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