S.T.Stent develops a composite removable sinus stent. The stent is designed to be placed into ethmoid sinus following functional endoscopic sinus surgery (FESS) to maintain the cavity open. FESS procedure is used to treat chronic sinusitis, which is one of the most common health problems in the modern world. However a single surgery often is not enough to cure the patient, due to post surgery scarring, stenosis and middle turbinate lateralization. The stent is designed to keep the cavity open, long enough for the healing process to complete itself and can be removed at any time, based on patient decision or physician consult. Stent removal is an in-office procedure, done without anesthesia, and is minimally invasive for the patient.