Device for positioning and fixing of therapeutic, surgical, or diagnostic instruments

Fixable positioning system for secure, play-free fastening of a surgical, therapeutic or diagnostic instrument relative to a human body, comprising:

• a holder having a head support configured for bilateral fixing directly to a skull in ear areas thereof;
• a base attached to the holder so as to be fully supported thereon;
• a linear axis mechanism having a linear guide and a threaded spindle extending parallel to said linear guide, said linear guide having an internally threaded member attached thereto, the threaded spindle being in threaded engagement with the internally threaded members to form a threaded drive and being axially movable relative to said linear guide by manual rotation of said spindle;
• a receiving device for receiving said instrument, said receiving device being connected to said threaded spindle for axial movement therewith and being guided by said linear guide for linear movement along said linear guide;
• and
• a ball-and-socket joint which is manually movable in three rotational degrees of freedom and which is fixable via a clamp mechanism, said ball-and-socket joint being connected between the base and the linear guide of the linear axis mechanism.