During a sEEG (stereo-
electroencephalography) intervention into the
skull of a patient, there is requirement to
drill a large number of trajectories. Typically, instrument stabilisation platforms and robots for protocols requiring only one or two trajectories are rigidly fixed to the
skull using
surgical anchor members fixed into the
skull around the one or two trajectories. However, because sEEG interventions require a large number of trajectories, an impractical number of
surgical anchor members need to be fixed into the skull resulting
in patient discomfort. Attachment of an intervention platform to all
surgical anchor members is not required at once. Accordingly, it is proposed to search for intersection points of the maximum extent of an intervention platform between at least two trajectory entry points on an object of interest of patient, so that at least one surgical anchor member can be shared when the intersection point is at first and the second trajectories. Any reduction in the number of surgical anchor members inserted into a patient reduces risk and discomfort. The positioning of the shared anchor members can be optimised to enable good
mechanical stability, and / or optical registration performance. Furthermore, the number of surgical anchor members required for intervention can be reduced. Because the surgical anchor members are sterilised and made from high quality
metal, a cost for performing the procedure can also be reduced.