03-12-2020 дата публикации
Номер: US20200375763A1
Принадлежит:
A passive prosthetic foot enables a below-knee amputee to walk with near able-body walking motions. The prosthetic foot includes a resilient heel that enables the heel to strike a walking surface more softly than in the prior art and more accurately transition the leg from swing phase to stance phase. The prosthetic foot is modeled generally as a wide Bézier curve, and the foot is characterized according to a set of at least 12 variables, including h, C1d, C2x, C2y, C2d, C3x, C3y, C3d, C4x, C4d, C5d and C6d, where C3y is heel size, C4x is heel geometry and C6d is curve intersection location. The variables are optimized to minimize a difference between a normal lower leg trajectory during gait and a modeled trajectory that includes the prosthetic foot. 1. A passive prosthetic foot comprising:a generally vertical keel;a generally horizontal elongated forefoot section attached to the keel at an attachment point, the forefoot section having a toe portion anterior to the attachment point; anda resilient heel attached to the forefoot section posterior to the attachment point, wherein:{'b': '50', 'the heel has a stiffness less than about N/mm;'}{'sub': 3y', '4x', '6d, 'at least the keel and the forefoot section are shaped according to a parametric curve characterized by a set of parameters, including at least one of C, C, and C.'}2. A passive prosthetic foot according to claim 1 , wherein set of parameters comprises at least twelve parameters including h claim 1 , C claim 1 , C claim 1 , C claim 1 , C claim 1 , C claim 1 , C claim 1 , C claim 1 , C claim 1 , C claim 1 , C claim 1 , and C.3. A passive prosthetic foot according to claim 1 , wherein the parametric curve comprises a wide Bézier curve.4. A passive prosthetic foot according to claim 1 , wherein the parametric curve comprises a polynomial interpolation.5. A passive prosthetic foot according to claim 1 , wherein the parametric curve comprises a Lagrange function interpolation.6. A passive prosthetic foot according ...
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