Patent ID: 7172630

Claim:
A prosthetic foot device, comprising: an elongated continuous cantilever-spring, extending from an attachment section coupleable to a stump of an amputee to a toe section at a toe location of a natural foot; the cantilever-spring being elastically deformable under a load to store energy as the amputee steps onto the cantilever-spring and to release energy as the amputee steps off of the cantilever-spring; a cam, pivotally coupled to the cantilever-spring at a pivot; a resistance arm, coupleable to the stump of the amputee, and extending to a displaceable section engaging the cam; a lever arm, attached to the cantilever-spring, and engaging the cam; and the cam operatively inter-coupling the cantilever-spring and the resistance arm to elastically deform the resistance arm along with the cantilever-spring to collectively store more energy than the cantilever-spring alone.