Medtronic received information regarding a navigation system during a cranial resection.
It was reported that the site registered their patient and verified at known anatomical points and made their burr hole.
After this, the surgeon wanted to change his entry point so he put the passive planar on the new entry point and the stealth coordinator at the site tried to make a new entry point but the screen was "flickering around".
The surgeon put the passive planar blunt (ppb) down and went to the navigation system.
When the surgeon went back and navigated the ppb again, the system was displaying 5cm into the brain.
The site switched to the navigus probe and it also showed 5cm deep.
The surgery was aborted and rescheduled for next time.
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