Mount to accommodate an oblong medical instrument

A mount to accommodate an oblong medical instrument, having a longitudinal instrument axis, for computer-assisted surgery, said mount comprising:

• a clamp bracket having an adjustable interior cross-section configured to clamp and thereby fix the oblong medical instrument in said clamp bracket, with the longitudinal instrument axis proceeding through said clamp bracket perpendicularly to said cross-section;
• a bearing comprising an inner bearing ring fixedly attached to said clamp bracket, and an outer bearing ring, said clamp bracket, and the oblong medical instrument fixed in said clamp bracket, being rotatable around said longitudinal axis together with said inner bearing ring, relative to said outer bearing ring;
• a localization structure configured to provide position information allowing detection and determination of a spatial position of the localization structure;
• and
• a support element rigidly attaching said localization structure to said outer bearing and thereby giving said localization structure a fixed spatial relation to said medical instrument fixed in said clamp bracket, and thereby, via said position information also allowing detection and determination of a spatial position of the medical instrument fixed in said clamp bracket due to said fixed spatial relation of said localization structure thereto.