The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 19, 1991
Filed:
Oct. 25, 1988
David G Firth, Seattle, WA (US);
Model & Instrument Development Corporation, Seattle, WA (US);
Abstract
A prosthetic foot (10) includes a viscoelastic cantilever spring keel (12) encased in foamed polymer cover (14) shaped to resemble a human foot. The keel (12) includes an attachment flange (16) for connecting the keel to an upper prosthesis at a location generally corresponding to the location of the ankle joint of a human foot. The keel (12) also includes a forefoot portion in the form of a singular beam (22) cantilevered forwardly and diagonally downwardly from the mounting flange (16). The beam (22) is composed of a primary section (50) extending forwardly from the attachment flange (16) and a forward portion (48) having a significantly lower spring rate and, thus, substantially more compliant than the adjacent portions of the beam primary section (50).