Amazing stuff!
"Acoustic tweezers that allow the remote manipulation of internal objects from outside the body could one day be used to expel urinary stones or control ingestible cameras. ... To test the technique in vivo, [researchers] implanted beads in the urinary bladders of three anaesthetized pigs. Directing the beam upwards into the pigs’ abdomens while the animals lay on their sides, the researchers moved the beads along complex paths several millimetres long. ..."
Acoustic tweezers move objects in the body remotely – Physics World
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