When surgical instrument tool (20) the endoscope (10) the operation duct (12) it is inserted inside, as for the specialist, the time when the point of the instrument appears from the point of the operation duct, therefore, the time when the point of the instrument arrives in the visible region of the observation device of the endoscope must be known. Because of this object, as the generator in order to form the measurement signal and expedient and the instrument in order to connect the measurement signal mutually the operation duct and/or vis-a-vis the instrument and/or the endoscope (20) influence of the position where it causes to the measurement signal according to the position is measured, the device which has with the measurement equipment in order to form the status signal which responds to particular influence is proposed.< Selective figure > Figure 1外科用器具(20)が内視鏡(10)の手術ダクト(12)内に挿入される場合、術者は、器具の先端が手術ダクトの先端から現われる時期、したがって、器具の先端が内視鏡の観察装置の可視領域に到達する時期を知らなければならない。本目的のため、測定信号を生成するためのジェネレータと、測定信号を手術ダクト及び/又は器具及び/又は内視鏡に対して相互接続するための手段と、器具(20)がその位置に応じて測定信号に及ぼす位置の影響を測定するとともに、当該影響に応じた表示信号を生成するための測定器とを備える装置が提案されている。【選択図】 図1
