The present invention relates to a minimally invasive surgical procedure device comprising a set for forming a modular surgical tool, said set comprising a carrier shaft (5) and a plurality of functional modules (7, 8, 9, 10, 12), in which said each functional module has means (14, 15) for rigid connection to the carrier shaft (5) and/or to another functional module and has dimensions suitable for insertion into the body of a patient through a trocar, wherein said device is characterized in that: - each functional module (7, 8, 9, 10, 12) has at least one degree of rotational or translational freedom and/or a functional end-piece such as a forceps, hook or a scalpel, - the carrier shaft (5) and/or the functional modules (7, 8, 9, 10, 12) comprise means for actuating said functional modules according to the respective degree of freedom thereof and/or the respective function thereof, and in that said device comprises an electromechanical interface capable of controlling the actuating of the assembled functional modules forming the tool.