DEVICE FOR MEASURING A POSITION OF A SURGICAL INSTRUMENT

摘要

The aim of the invention is to make it possible for an operator to know when the distal end of a surgical instrument (20) protrudes from the distal end of an operating duct (12) of an endoscope (10) and thus reaches the visible range of an observation apparatus of the endoscope when said surgical instrument is inserted into the operating duct of the endoscope. Said aim is achieved by a device comprising a generator for generating a measuring signal, mechanisms for injecting the measuring signal into the operating duct and/or the surgical instrument and/or the endoscope, and an apparatus for measuring a positional effect which the surgical instrument (20) has on the measuring signal in accordance with the position of the surgical instrument in the operating duct (12) and generating a display signal according to said effect.