Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Having electrical actuator
Patent
1998-11-10
2000-09-05
Willse, David H.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Having electrical actuator
623 44, 1882823, A61F 264, A61F 270, F16F 9512
Patent
active
061136425
ABSTRACT:
A computer controlled hydraulic resistance device for apparatus such as a prosthetic knee for above knee amputees, includes a two stage pilot operated solenoid 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 by a spring biased magnet and a magnetically actuated electronic sensor 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 has magnetically actuated electronic sensors which sense positions of the apparatus and feed back to the micro-controller for applying a predetermined resistance profile to the apparatus.
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"Design Principles, Biomedical Data and Clinical Experience With A Polycentric Knee Offering Controlled Stance Phase Knee Flexion: A Preliminary Report", Siegmar Blumentritt, PhD et al 1997, Journal of Prosthetics and Orthotics, vol. 9, No. 1, 18-24.
"Optimal Control For An Above-Knee Prosthesis With Two Degrees Of Freedom", D. Popovic et al, 1995, pp. 89-98, J. Biomechanics, vol. 28, No. 1.
Gruesbeck William G.
Petrofsky Steven H.
Mauch, Inc.
Willse David H.
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