Laser pointer

A device to be used in combination with a surgical navigation system for defining the position of a straight line determined by an operating surgeon within a three-dimensional coordinate system in an operating theatre, including:

• A) a body (1) having a surface (2) and at least three markers (3) emitting waves (19), positions of said markers being determined within the three-dimensional coordinate system by means of a position detector that is part of the surgical navigation system;
• whereby
• B) the body (1) comprises a laser (4) that emits a laser beam (5), directed away from the body (1), said laser beam having a geometrical central beam (6) and a wavelength in the visible range;
• and
• C) a position of the central beam (6) relative to the three-dimensional coordinate system may be calculated from the determined positions of the markers (3) by means of a computer that is also part of the surgical navigation system;
• and wherein
• D) the body (1) is a planar plate with a top surface (11) and a bottom surface (12);
• E) the laser beam (5) is emitted so as to be directed away from the bottom surface (12);
• and
• F) the markers (3) are arranged in a plane extending parallel to the top surface (11) and the laser beam (5) is emitted vertically relative to said plane.