Vivos Inc., a radiation oncology medical device company, develops brachytherapy devices for the treatment of non-resectable tumors in the United States. It develops yttrium-90 based RadioGel device, an injectable particle-gel for brachytherapy radiation treatment of cancerous tumors in people and animals; and IsoPet for the treatment of solid tumors in animals. The company was formerly known as Advanced Medical Isotope Corporation and changed its name to Vivos Inc. in December 2017. Vivos Inc. was incorporated in 1994 and is headquartered in Richland, Washington.