Patent ID: 11883304
Assignee: VANDERBILT UNIVERSITY
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A knee prosthesis, comprising:
a shank link;
a polycentric knee joint comprising an extension stop, the extension stop substantially preventing the knee prosthesis from hyperextending;
a thigh link rotatably coupled to the shank link by the polycentric knee joint;
at least one powered control element configured to power rotation of the thigh link relative to the shank link; at least one sensor;
and a controller coupled to the at least one sensor, the controller configured to:
receive sensor measurements from the at least one sensor and determine, based at least on the sensor measurements, a present state of a plurality of states comprising at least a swing state and a stance state; and
cause the at least one powered control element to power rotation if the present state is a swing state;

wherein the polycentric knee joint is further configured to provide a center of rotation of the thigh link relative to the shank link, wherein the center of rotation is substantially posterior to a ground reaction force vector if the present state is the stance state, and
wherein the at least one powered control element is configured to apply a maximum torque on the knee prosthesis which is substantially smaller than a maximum torque provided by the polycentric knee joint when the polycentric knee joint is hyperextended.