It looks like a small pill attached to a long string. But scientists say the so-called “pill†may replace traditional endoscopy tests because can easily collect cells and tissues from the throat and esophagus to screen for cancer.
https://www.labroots.com/trending/cancer/6360/-sponge-string-detects-esophageal-cancer
Sponge on a String' Detects Esophageal Cancer