An improved medical device for use in the treatment of stenosis of the ostium of tubular organs, such as, but not limited to blood vessels. The devices, systems and methods include a hydrocarbon absorbent material, and a structural element configured to hold the hydrocarbon absorbent material within a clean air tube of an internal combustion engine. The curved bearing surfaces are able to maintain substantially full contact with each other under transverse loading. After the first period, the gate high voltage is a second voltage. Further, a process of producing a container wall of paper is described.