Patent ID: 8382852

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 of said liner body; 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 body 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 cylindrical member; d) a sweat port mounted in said outlet end of said bore of said cylindrical member and defining a passageway 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 attached to said sweat port downstream of said one-way valve, said pin extending axially with respect to said liner body for securely fitting said liner to a prosthetic limb; and f) a vent extending through said pin and terminating in a vent port, said vent extending axially or radially through said pin to said vent port and fluidly communicating said passageway of said sweat port to the surrounding environment.