Liner and Electroactive Polymer Prosthetic Socket

To address the Office of the Secretary of Defense (OSD) need for a proactive dynamic accommodating prosthetic socket, Physical Optics Corporation (POC) proposes to complete the development of a new Liner and ElectroActive Polymer Prosthetic Socket (LEAPPS). The system has a demonstrated capability to accommodate changes in the physiology of the wearer’s residual limb and adjust to the soldier’s changing stance by instantly providing softer/harder locations within the socket during ambulation or while in a fixed position (e.g., sitting). Heat/moisture management is provided by a comfortable wicking liner that dissipates heat within the socket while also serving as moisture sensors to initiate peristaltic action driving perspiration out of the system. A key technical breakthrough demonstrated by the LEAPPS system in Phase I is the ability of electroactive polymer (EAP) materials to change shape in response to automated control electronics and thus accommodate volume changes of a residual limb. In Phase II, POC will integrate LEAPPS system components such as the EAP actuator/sensors, electronics controls/firmware, orientation/inertial sensor, and rechargeable power source within optimal locations of an actual prosthetic device to provide the ultimate fit responding directly to wearer’s gait and posture regardless of activity level.