IsoRay, Inc. is a medical technology company. The Company, through its subsidiary, IsoRay Medical, Inc., develops, manufactures and sells isotope-based medical products and devices for the treatment of cancer and other malignant diseases. The Company is engaged in the production and sales of Cesium-131 (Cs-131) brachytherapy seeds. Brachytherapy seeds are small devices containing a therapeutic dose of radiation used in an interstitial radiation procedure. The brachytherapy procedure places radioactive seeds as close as possible to (in or near) the cancerous tumor. The Cs-131 includes radioisotope in the treatment of all malignant tumors, such as prostate cancer, brain cancer, breast cancer, colorectal cancer, gynecological cancer, lung cancer, liver cancer, ocular melanoma and pancreatic cancer. The Company's Proxcelan Cesium-131 seed is classified as a Class II device.