A process for producing and assembling a medical operations syringe (20) comprising in the order the operations of extruding plastic material in order to obtain an intermediate tubular element (1) made of plastic material at least partially at molten state, performing on the intermediate tubular element (1) a blow molding in order to obtain at least a hollow body (2), inserting firmly and at least partially a thrust piston (3) into the hollow body (2) immediately after the blow molding operation.
