An instrument system for minimally invasive surgery in single port technology, having a trocar and at least one instrument channel which runs at the trocar from proximal to distal and a proximal end remaining extra-corporally when the trocar is inserted into the body of a patient, and a distal end located intra-corporally, wherein a semi-flexible instrument can be inserted through the instrument channel in such a manner that the operating handle thereof remains extra-corporal and the distal working element thereof emerges distally from the instrument channel. The instrument channel is flexibly pliant, stable in the longitudinal direction thereof and arranged outside on the trocar. The distal end of the instrument channel is fixed to the trocar.
