The medical devices of the invention comprise an expandable portion which is covered with a sponge coating for release of at least one biologically active material. The scanner is associated with data files that enable conversion of the character identification table and also source code to conform to different standard character set representations. Preferably, the inner surface of the conduit comprises pits having a depth of 1-4 \u03bcm. The controller manages each VM by providing test commands and monitoring the results.