The present invention relates to a device for creating a working space within a human or animal body. The device comprises an outer wall which is configurable to adopt a non-expanded condition and an expanded condition. When the outer wall is in said expanded condition it defines a hollow body having an inner cavity in communication with an orifice for location adjacent a working site within the body such that, in use, said working site can be visualized and/or accessed via said inner cavity and said orifice.
