Gewoon doorslikken en de camera's doen de rest:The PillCam™ ESO video capsule is specifically designed to view the inner lining of the Esophagus. The capsule is equipped with miniature cameras on both ends and is about the size of a multi-vitamin, which can be swallowed easily.
via: PillCam ESO 2 goes where no cam has gone before » Coolest Gadgets
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