A handheld scanning subsurface detector includes a detector module and a computing unit located in handheld housing, a guide for guiding the detector module at a predetermined distance over a to-be-analyzed wall surface, at least one path sensor connected to the computing means and connected, in a controlling manner, to the detector module by controlling means. A generally C-shaped trocar provides increased work space between the hands of the surgeon as well as S-shaped laparoscopic instruments placed through the trocar when laparoscopic instrument-trocar units are placed through the umbilicus. An object identifier is selectively added dependent on the class of object. A flyback energy transfer element having a flyback input winding and a forward energy transfer element having a forward input winding are also included.