Prosthetic foot with a resilient ankle
View Patent ↗A prosthetic foot device includes an elongated upper forefoot portion, an ankle portion, and a lower footplate. The forefoot portion can extend rearwardly through an upper attachment section, downwardly through an ankle section, forwardly through an arch section, and to a toe section. The ankle portion can attach to the forefoot portion, and can extend rearwardly through an upper attachment section, downwardly through an ankle section, forwardly under the ankle section of the forefoot portion, and rearwardly to a heel section, in a substantial s-shaped profile. The lower footplate can attach to the ankle or forefoot portion, and can extend through a heel section, an arch section, and to a toe section. The upper forefoot, the ankle portion, and the lower footplate each being flexible to store energy and resilient to return energy.
1. A prosthetic foot device, comprising:
a) an elongated forefoot portion extending 1) rearwardly through an upper attachment section configured to be coupled to a limb of an amputee, 2) downwardly through an ankle section positioned at an ankle location of a natural foot, 3) forwardly through an arch section, and 4) to a toe section positioned at a toe location of a natural foot; and
b) an elongated rear ankle portion extending 1) rearwardly through an upper attachment section attached to the attachment section of the forefoot portion, 2) downwardly through an ankle section, 3) forwardly under the ankle section of the forefoot portion, and 4) rearwardly to a heel section positioned at a heel location of a natural heel.
2. A device in accordance with claim 1 , wherein the forefoot portion and the ankle portion are flexible to store energy and resilient to return energy.
3. A device in accordance with claim 2 , wherein the forefoot portion and the ankle portion include a composite material with fiber in a resin matrix.
4. A device in accordance with claim 1 , further comprising:
a lower footplate, attached to the ankle portion, and extending forwardly 1) through a heel section attached to the heel section of the ankle portion, 2) an arch section, and 3) to a toe section positioned at a toe location of a natural foot.
5. A device in accordance with claim 4 , further comprising a cushion member disposed between the toe section of the forefoot portion and the toe section of the lower footplate.
6. A device in accordance with claim 1 , further comprising:
a lower footplate, attached to the forefoot portion, and extending rearwardly 1) through a toe section attached to the toe section of the forefoot portion, 2) an arch section, and 3) to a heel section positioned at a heel location of a natural foot.
7. A device in accordance with claim 1 , wherein the ankle portion has a substantially s-shaped profile.
8. A device in accordance with claim 1 , wherein the forefoot portion includes at least two laterally separated and adjacent forefoot portions.
9. A device in accordance with claim 1 , wherein the upper attachment section of the upper forefoot portion and the upper attachment section of the ankle portion are disposed at an oblique angle.
10. A device in accordance with claim 9 , further comprising:
an attachment member, configured to be coupled to a limb of an amputee, having a lower oblique surface; and wherein the upper attachment section of the forefoot portion and the upper attachment section of the ankle portion are attached to the lower oblique surface of the attachment member.
11. A device in accordance with claim 1 , wherein:
the ankle section of the forefoot portion includes a discrete, straight section oriented substantially vertically; and
the forefoot portion further includes a first curved section interconnecting the attachment section and the straight section, and a second curved section interconnecting the straight section and the arch section.
12. A device in accordance with claim 1 , further comprising:
at least one energy transfer member, disposed between the heel section and the ankle section of the rear ankle portion, to transfer energy from the heel section of the ankle portion to the ankle section of the ankle portion during use.
13. A device in accordance with claim 1 , further comprising:
a reinforcement member having an attachment section attached to the rear ankle portion and a heel section positioned above the heel section of the ankle portion.
14. A prosthetic foot device, comprising:
a) an attachment member, couplable to a limb of an amputee;
b) an elongated, upper forefoot, attached to the attachment member, extending 1) rearwardly through an upper attachment section attached to the attachment member, 2) downwardly through an ankle section positioned at an ankle location of a natural foot, and 3) forwardly to a toe section positioned at a toe location of a natural foot;
c) an elongated ankle portion, attached to the attachment member, extending 1) rearwardly through an upper attachment section attached to the attachment member, 2) downwardly through an ankle section, 3) forwardly under the ankle section of the upper forefoot, and 4) rearwardly to a heel section positioned at a heel location of a natural heel; and
d) an ankle reinforcement member, attached to the attachment member and disposed proximate to the ankle portion, extending 1) rearwardly through an upper attachment section attached to the attachment member, 2) downwardly through an ankle section, 3) forwardly under the ankle section of the upper forefoot, and 4) rearwardly to a position above the heel section of the ankle portion.
15. A device in accordance with claim 14 , wherein the forefoot portion defines a spring that flexes under a load to store energy, and returns to an original configuration while the load is released to release the stored energy; and wherein the ankle portion and the ankle reinforcement member define resilient spring members that flex under a load to absorb shock.
16. A device in accordance with claim 14 , wherein the ankle portion and the ankle reinforcement member each has a substantially s-shaped profile.
17. A device in accordance with claim 14 , wherein:
the ankle section of the forefoot includes a discrete, straight section oriented substantially vertically; and
the forefoot portion further includes a first curved section interconnecting the attachment section of the forefoot and the straight section, and a second curved section interconnecting the straight section and the toe section.