Disclosed herein are medical devices comprising a single-lobed, thin-walled,expandable body("ballstent" or "blockstent") and a flexible, elongated delivery device("delivery catheter") and systemsand methods of use for treating saccular vascular aneurysms and methods of usefor occludingsegments of blood vessels and other biological conduits. Expandable bodiescomprising gold, platinum,or silver that can be compressed, positioned in the lumen of an aneurysm orblood vessel, and expandedto conform to the shape of the aneurysm or segment of blood vessel orbiological conduit are disclosed.
