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In 2010, a surgery was performed in Kobe, Japan. iPads were used in conjunction with OsiriX 3D navigation software to help surgeons by acting as an interactive, detailed monitor. In the video, we can see assistants zooming in and out on the screen as others perform the procedure.
It was not the most elegant solution, as the device had to be wrapped in plastic -- not only to stop fluids breaking it, but for hygiene purposes. It also required two people to use it, one to hold the item and another to show the screen to doctors, but as iPad use in the medial profession continues to grow, it may yet prove as valuable a tool as a scalpel.