An expandable conduit-guide providing a leak-tight conduit through a skin between an inside of a corpus and an outside of the corpus is disclosed. The conduit-guide includes a body encompassing a lumen extending essentially axially along a center-line, and has a distal-end to be positioned outside of the corpus, and a proximal-end to be positioned inside of the corpus. The body of the conduit-guide is constructed from a braided-wire so that the conduit-guide is capable of actively expanding from a closed diameter to an opened diameter with the placement of the medical device positioned within the lumen (110) and passively collapsing from the opened diameter to the closed diameter upon withdrawal of the medical device under a spring load of the braided-wire. A catheter-sheath and a catheter-sheath-assembly, as well as to a method for applying and positioning an expandable conduit-guide (1), catheter-sheath (8) and a catheter-sheath-assembly (800) are disclosed.
