The present invention provides a two-part robotic device for positioning of a hand tool, comprising: a. a fixed base unit constantly fix to its position； b. a detachable body unit reversibly coupled to said fixed base unit, coupled to said current medical instrument； wherein said fixed base unit is adapted to provide independent movement to said hand tool, said independent movement selected from the group consisting of rotation and translation, and further wherein said detachable body unit is removable and replaceable from said fixed base unit such that upon exchange of said hand tool for a second hand tool, said second hand tool is placed in substantially the same location as the location of said hand tool prior to said exchange.
