US 10,376,388 B2
Ankle-foot prosthesis for automatic adaptation to sloped walking surfaces
Andrew H. Hansen, Apple Valley, MN (US); and Eric A. Nickel, Brooklyn Park, MN (US)
Assigned to The United States Government as represented by the Department of Veterans Affairs, Washington, DC (US)
Filed by U.S. Department of Veterans Affairs, Washington, DC (US); and Regents of the University of Minnesota, Minneapolis, MN (US)
Filed on Feb. 16, 2017, as Appl. No. 15/434,533.
Application 15/434,533 is a continuation in part of application No. 15/359,242, filed on Nov. 22, 2016, granted, now 10,105,243.
Application 15/359,242 is a continuation of application No. 14/022,645, filed on Sep. 10, 2013, granted, now 9,549,827.
Claims priority of provisional application 61/851,740, filed on Mar. 13, 2013.
Claims priority of provisional application 61/703,799, filed on Sep. 21, 2012.
Prior Publication US 2017/0156894 A1, Jun. 8, 2017
This patent is subject to a terminal disclaimer.
Int. Cl. A61F 2/50 (2006.01); A61F 2/66 (2006.01); A61F 2/74 (2006.01)
CPC A61F 2/6607 (2013.01) [A61F 2002/5006 (2013.01); A61F 2002/6614 (2013.01); A61F 2002/6642 (2013.01); A61F 2002/745 (2013.01); A61F 2002/748 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An ankle-foot prosthesis, comprising:
a) a foot plate including a rear portion and a forward deflectable portion;
b) an ankle frame including anterior and posterior portions and an apex portion;
c) said posterior portion of said ankle frame attached to said rear portion of said foot plate;
d) a yoke including front and rear end portions, and a fulcrum point therebetween;
e) said yoke pivotally connected to said apex portion of said ankle frame at the fulcrum point thereof and including a member for attaching to a prosthetic leg;
f) a hydraulic damper having a first end pivotally connected to the front end portion of said yoke and a second end pivotally connected to said posterior portion of said ankle frame;
g) a stiffness member disposed in parallel to said damper;
h) a fluid control circuit for controlling extension and compression of said damper;
i) said anterior portion of said ankle frame including a curved surface inclined upwardly relative to said foot plate and forwardly toward said forward deflectable portion of said foot plate; and
j) said curved surface forming a roll-over surface for limiting a dorsiflexion deflection of said forward deflectable portion of said foot plate by a direct engagement therewith.