Real time correlated depiction system of surgical tool

A depiction system for generating a real time correlated depiction of movements of a surgical tool, the system comprising

• a computer system,
• 3D surface data generation means adapted for providing the computer system with three-dimensional (3D) data representing at least one surface section in 3D space of a minimally invasive surgery cavity, wherein said surface section comprises a target area, and
• position data generation means adapted for obtaining real time spatial position data of at least a part of the surgical tool and for transmitting said obtained spatial position data to said computer system,
• wherein at least one of said 3D surface data generation means and said position data generation means comprises surface position data generation means adapted for providing surface position data of at least said target area, said computer system being programmed for
• determining a 3D surface contour of at least a part of said target area of said surface section of said minimally invasive surgery cavity using said 3D data,
• determining real time spatial positions of said surgical tool relative to at least a part of said target area of said at least one surface section using said spatial position data and said surface position data,
• calculating depiction data representing a depiction of said real time relative spatial positions of said surgical tool onto at least a portion of said surface contour of said surface section of said minimally invasive surgery cavity, and for
• transmitting said depiction data to a display unit for real time correlated depiction of movements of said surgical tool, wherein the depiction data is graphically overlaid on an image of said target area and presented on the display unit in a graphical depiction, the graphical depiction overlaid on the image of said target area and comprising a bounded region that is configured to contract when the tool is advanced toward the target area and configured to expand when the tool is retracted away from the target area, wherein a displayed size of the image remains substantially constant when the tool is advanced or retracted.