Patent ID: 7398798

Claim:
A sleeve lined convolute duct, comprising: a convolute duct comprising a convolute portion and a pair of non-convolute portions, wherein one non-convulate portion of said pair of non-convolute portions is disposed at each side of said convolute portion, respectively; a sleeve liner disposed within said convolute duct and spanning said convolute portion, said sleeve liner having an attached end and an opposite free end, said sleeve liner having a constant inner diameter and a smooth, continuously even inner surface, wherein said spanning is at least coterminal with said convolute portion such that said sleeve liner sealingly abuts said pair of non-convolute portions; and an attachment of said sleeve liner at said attached end thereof to a non-convolute portion of said convolute duct; wherein said free end of said sleeve liner is freely slidable in said convolute duct in response to movements of said convolute duct, wherein said free end always remains in a sealing cuff abutment with a non-convolute portion of said pair of non-convolute portions; and wherein said free and attached ends of said sleeve liner each form a respective sealing cuff with respect to each said non-convolute portion of said convolute duct.