| 摘要 |
A surgical instrument system includes a tool ( 2 ) including an elongate shaft which defines the tool axis. The shaft bears a plurality of marker rings ( 10, 11, 12 ) arranged in a predetermined pattern on the surface of the shaft so that they extend around the shaft axis. The system includes at least two receiving devices ( 14 ) which are spaced apart for receiving sterioscopic signals from the rings on the tool, and a data processor ( 16 ) for analysing the signal from the rings and generating information relating to the position and orientation of the tool relative to the receiving device.
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