Prosthetic foot
First Claim
1. A prosthetic foot comprising a forefoot portion, a midfoot portion and a hindfoot portion, said hindfoot portion including first and second joints permitting closed kinetic chain motion of the prosthetic foot in gait, said first joint having a joint axis oriented for permitting motion of said hindfoot portion about said first joint axis which is at least primarily in the sagittal plane and said second joint having a joint axis oriented for permitting motion of said hindfoot portion about said second joint axis which is at least primarily in the frontal and transverse planes.
1 Assignment
0 Petitions
Accused Products
Abstract
An ankle joint and a subtalar joint provided in a hindfoot permit closed kinetic chain motion of the foot. The ankle and subtalar joints are preferably formed integrally with the hindfoot by respective struts of resilient material of the hindfoot. An arch in the midfoot creates frontal and sagittal plane motion capabilities. The forefoot includes at least one expansion joint hole extending therethrough between dorsal and plantar surfaces. An expansion joint extends forward from the hole to the anterior edge of the forefoot to form plural expansion struts that create improved biplanar motion capability of the forefoot. Concavities and convexities on the surface of the hindfoot, midfoot and forefoot encourage desired motions and motion directions so that the foot functions and feels like a normal foot to the amputee.
242 Citations
71 Claims
- 1. A prosthetic foot comprising a forefoot portion, a midfoot portion and a hindfoot portion, said hindfoot portion including first and second joints permitting closed kinetic chain motion of the prosthetic foot in gait, said first joint having a joint axis oriented for permitting motion of said hindfoot portion about said first joint axis which is at least primarily in the sagittal plane and said second joint having a joint axis oriented for permitting motion of said hindfoot portion about said second joint axis which is at least primarily in the frontal and transverse planes.
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56. A prosthetic foot comprising a forefoot portion, a midfoot portion and a hindfoot portion, said hindfoot portion including means for permitting triplanar closed kinetic chain motion of the prosthetic foot in gait, the plantar surface of said midfoot portion having a longitudinal arch which is formed with a concavity having a longitudinal axis that is deviated in the frontal plane 25°
- -42°
from the transverse plane to create frontal and sagittal plane motion capabilities, the medial aspect of said longitudinal arch concavity being larger in radius and more proximal than the lateral aspect of said concavity. - View Dependent Claims (57, 58, 59, 60)
- -42°
- 61. A prosthetic foot comprising a forefoot portion, a midfoot portion and a hindfoot portion, said hindfoot portion including means for permitting triplanar closed kinetic chain motion of the prosthetic foot in gait, the posterior of said forefoot portion including at least one expansion joint hole extending through said forefoot portion between dorsal and plantar surfaces thereof with an expansion joint extending forward from said expansion joint hole to the anterior edge of said forefoot portion to form plural expansion struts which create improved biplanar motion capability of said forefoot portion.
- 65. A prosthetic foot comprising a forefoot portion, a midfoot portion and a hindfoot portion, said hindfoot portion including an ankle joint and a subtalar joint permitting closed kinetic chain motion of the prosthetic foot in gait, said ankle joint having a joint axis oriented for permitting motion of said hindfoot portion about said ankle joint axis which is at least primarily in the sagittal plane and said subtalar joint having a joint axis oriented for permitting motion of said hindfoot portion about said subtalar joint axis which is at least primarily in the frontal and transverse planes, said ankle and subtalar joints being formed integrally with said hindfoot portion by respective struts of resilient material of said hindfoot portion.
Specification