Frequency Detection Method for Measuring Position and Orientation of Laproscopic Surgery Tools

A new positioning system is proposed that should give the surgeon the exact location and orientation of the instruments in the patient. The measuring system consists of markers placed on the instruments, outside of the human body. Two pairs of ultrasound markers placed on each instrument will suffice to measure both the position and orientation. The detection of marker positions is realized with time of flight method by an array of ultrasound receivers. Using a burst which has the frequency shift-keyed after half of the transmission period it seems that an accurate measurement system can be achieved. Keywordsultrasound, 3D detection, laparoscopic instrument