Computer controlled hydraulic resistance device for a prosthesis and other apparatus
USRE39961E1 · kind E1 · reissue
Assignee
Inventors
Key dates
| Filing date | Apr 29, 2003 |
| Grant date | Dec 25, 2007 |
| Priority date | — |
| Expiry date | Apr 29, 2023 |
Classification
- Technology area (CPC —)General
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.