Patent ID: 8216267

Claim:
An expandable medical balloon useful for treatment of a bifurcated vessel, the balloon comprising a body, waist and cone portions, the balloon body having a central body portion, the balloon having an unexpanded and at least one expanded state, in the unexpanded state the balloon comprising at least one continuous inner layer, the inner layer having an inner surface and an outer surface, and at least one outer layer, the outer layer is integral with the inner layer and in the body portion is coextensive therewith except for a cavity in the central portion of the balloon body, said cavity is a single opening which extends through the outer layer exposing the outer surface of the inner layer, the at least one inner layer protruding through the cavity in the at least one outer layer when the balloon is in said at least one expanded state, the balloon comprising the inner layer and the outer layer in the unexpanded and expanded states.