Expandable devices, rail systems, and motorized devices

摘要: Provided herein are expandable devices, rail systems, and motorized devices. In one embodiment, an device comprises sac having a tool housed therein. The is optionally configured for operation while inside body cavity. at least in the sac, railed coupled to movement there on. Movement of on provided by, example, motor such as electromagnetic or inch-worm type motor. Expandable devices can be used, perform minimally invasive medical procedures requiring access also provide safe stable transport instruments