Engineers have shown it is technically possible to guide a tiny robotic capsule inside the colon to take micro-ultrasound images. Known as a Sonopill, the device could one day replace the need for patients to undergo an endoscopic examination, where a semi-rigid scope is passed into the bowel - an invasive procedure that can be painful.
from https://www.sciencedaily.com/releases/2019/06/190619142523.htm
from
https://healthnews010.tumblr.com/post/185718958413
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