Patent ID: 8808394

Claim:
A liner comprising: a) an elastomeric liner body comprising an open proximal end and a closed distal end except for a centrally extending channel, said liner body defining an interior volume; b) at least one symmetrical buttress element mounted centrally to said distal end of said liner body and having a cylindrical member extending away from said distal end; said cylindrical member defining a bore therethrough having an inlet end and an outlet end; c) said channel in the distal end of the liner having an inlet in fluid communication with said interior volume of said liner body and an outlet in fluid communication with said inlet end of said bore of said cylindrical member; d) a sweat port mounted in said outlet end of said bore of said cylindrical member of said buttress element and defining a passageway extending along a longitudinal axis therethrough in fluid communication with said channel, said sweat port having a one-way valve mounted in said passageway and adapted to provide one-way flow from said interior volume; e) a pin having a longitudinal axis attached to said sweat port downstream of said one-way valve, said longitudinal axis of said pin being aligned with said longitudinal axis of said sweat port whereby said pin extends axially with respect to said liner body and is configured to be lockingly engaged by a prosthetic socket; and f) a vent downstream of said one-way valve fluidly communicating said passageway to surrounding environment of said sweat port and/or said pin.