A cutting device for performing a surgical procedure includes an elongated shaft extending between a proximal end and a distal end, a first cutting element, and a second cutting element. The elongated shaft of the cutting device includes an inner surface defining a passageway. The first cutting element extends from the distal end of the elongated shaft so as to contact tissue. The second cutting element is disposed at least partially within the passageway and extends from the distal end of the elongated shaft. The second cutting element is configured for retractable extension beyond the distal end of the elongated shaft so as to contact tissue. The cutting device also includes a deployment mechanism disposed with the proximal end of the elongated shaft for engaging and actuating the second element.
