Medical Instrument

A Kirschner-wire comprising a proximal end, a distal tip and a localizer coil for an for an electromagnetic navigation system, the localizer coil arranged in a distal section of the Kirschner-wire at a distance of between about 4 mm and about 24 mm from the distal tip, the localizer coil electrically connected to at least a first electrically conducting signal line and a second electrically conducting signaling line for passing at least a first electric signal and a second electric signal from the localizer coil to an electromagnetic navigation system, each of the first electrically conducting signal line and the second electrically conducting signaling line comprising a releasable and reconnectable electric and mechanical connector that allows disconnection and reconnection of a distal section of the first electrically conducting signal line and the second electrically conducting signaling line from a proximal section of each of said first electrically conducting signal line and the second electrically conducting signaling line, wherein a connector is arranged near or at the proximal end of the Kirschner-wire and wherein a cannulated instrument can be slid over the Kirschner-wire when the proximal sections of the first electrically conducting signal line and a second electrically conducting signaling line are electrically and mechanically disconnected from the respective distal sections of the first electrically conducting signal line and a second electrically conducting signaling line.