Abstract
Injectable collagen has been used for vocal fold augmentation in human subjects because it has been shown to be efficacious in relieving glottic insufficiency. The application of a bioimplant material for this purpose raises the question of the permanence of the correction. Injectable collagen has been shown to undergo some degree of resorption. Injection of 3% atelo-collagen (Koken Co.) has been conducted in 9 cases of sulcus vocalis. One of nine patients required re-injection only 2 months after the first treatment. We employed a flexible therapeutic laryngofiberscope for the second injection. This technique was available in a case which required short term re-injection of collagen because of its resorption and could be done under local anesthesia without hospital admission.
