Intersect ENT, Inc. Common Stock, also called Intersect ENT, is a commercial drug delivery company, which engages in the treatment of ear, nose, and throat conditions. Read More Its products include PROPEL and SINUVA. The PROPEL used to maintain the opening and locally deliver steroid after sinus surgery. The SINUVA is used to treat adult patients with ethmoid sinus surgery yet suffer from recurrent sinus obstruction due to polyps. The company was founded by Donald J. Eaton in October 2003 and is headquartered in Menlo Park, CA.