Prosthetic foot with tunable performance
First Claim
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1. A prosthetic foot comprising:
- a longitudinally extending foot keel;
a coupling element connected to the foot keel;
a resilient, upstanding, anterior facing convexly curved calf shank above ankle joint height having a lower end connected to the coupling element to form an ankle joint area of the foot, and an upper end to connect with a supporting structure on an amputee'"'"'s leg;
wherein the coupling element includes a resilient material between the foot keel and calf shank, said resilient material being elongated in a direction forming a joint having an oblique joint axis permitting closed kinetic chain motion of the prosthetic foot in gait, the oblique joint axis as projected on a sagittal plane being deviated with respect to a transverse plane with the anterior of the joint axis more proximal than the posterior of the joint axis, wherein said resilient material oblique joint axis in response to gait force provides a means for frontal plane foot keel and transverse plane calf shank motions.
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Abstract
A prosthetic foot (70) incorporates a foot keel (71) and a calf shank (72) connected to the foot keel to form an ankle joint area of the prosthetic fool. The foot keel has forefoot and hindfoot portions and an upwardly arched midfoot portion extending between the forefoot and midfoot portions. The calf shank includes a downward convexly curved lower end which is adjustably attached at a portion thereof to the foot keel by way of a releasable fastener arrangement which includes a coupling element (73) intermediate the calf shank and foot keel. The coupling element includes a resilient material forming a joint permitting subtalar joint-like motion of the prosthetic foot in gait.
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Citations
27 Claims
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1. A prosthetic foot comprising:
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a longitudinally extending foot keel; a coupling element connected to the foot keel; a resilient, upstanding, anterior facing convexly curved calf shank above ankle joint height having a lower end connected to the coupling element to form an ankle joint area of the foot, and an upper end to connect with a supporting structure on an amputee'"'"'s leg; wherein the coupling element includes a resilient material between the foot keel and calf shank, said resilient material being elongated in a direction forming a joint having an oblique joint axis permitting closed kinetic chain motion of the prosthetic foot in gait, the oblique joint axis as projected on a sagittal plane being deviated with respect to a transverse plane with the anterior of the joint axis more proximal than the posterior of the joint axis, wherein said resilient material oblique joint axis in response to gait force provides a means for frontal plane foot keel and transverse plane calf shank motions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A prosthetic foot comprising:
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a longitudinally extending foot keel; a coupling element connected to the foot keel; a resilient anterior facing convexly curved calf shank having a lower end secured to the coupling element, the calf shank and foot keel having respective, facing, convexly curved surfaces whose radii and relationship affect a dynamic response capability and motion outcome of the prosthetic foot in gait; an adjustable fastening arrangement securing the calf shank to the foot keel by way of the coupling element, the fastening arrangement permitting adjustment of the relationship of the respective, convexly curved surfaces of the foot keel and calf shank to tune the performance of the prosthetic foot; wherein the coupling element includes a resilient material between the foot keel and calf shank, said resilient material being elongated in a direction forming a joint having an oblique joint axis permitting closed kinetic chain motion of the prosthetic foot in gait, the oblique joint axis as projected on a sagittal plane being deviated with respect to a transverse plane with the anterior of the joint axis more proximal than the posterior of the joint axis, wherein said resilient material oblique joint axis in response to gait force provides a means for frontal plane foot keel and transverse plane calf shank motions. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification