| CPC A61B 34/20 (2016.02) [A61B 5/061 (2013.01); A61B 5/4851 (2013.01); A61B 17/1742 (2013.01); G06T 7/70 (2017.01); A61B 2017/00725 (2013.01); A61B 17/155 (2013.01); A61B 17/1746 (2013.01); A61B 2034/2046 (2016.02); A61B 2034/2055 (2016.02); A61B 2034/2057 (2016.02); A61B 2034/2065 (2016.02); A61B 2034/2068 (2016.02); A61B 34/30 (2016.02); A61B 2090/3983 (2016.02)] | 16 Claims |

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1. A surgical instrument comprising:
a probe tip for probing positions in a space;
a tool interface, separate from the tip; and
an optically trackable target;
wherein the optically trackable target is configured to provide optical information with which to determine the positions;
wherein the tool interface is configured to mate with a surgical tool such that the optical trackable target then provides optical information with which to determine positional information for the surgical tool in the space; and
wherein the tool interface comprises channel surfaces defining a channel having a V-shape, the channel surfaces configured to receive a shaft of the tool for coupling the instrument to the surgical tool.
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