DEVICES AND METHODS FOR THE DILATION OF SINUS OSTIA AND OTHER BODY PASSAGES

Apparatus and methods are disclosed to dilate a sinus ostium or other body passage. In one embodiment, the apparatus includes an elongate inner member, one or more dilation members disposed concentrically around the inner member, and an outer sheath. The inner member includes a distal portion that extends beyond distal end of the dilation member(s). The sheath is disposed around the inner member and dilation member(s) and is at least partially expandable to accommodate advancement of the dilation member(s) relative to the inner member, e.g., to translate axial forces into radial dilating forces, and dilate surrounding tissue within which the distal portion is introduced. Optionally, an elastic cover is provided over at least a portion of the inner member distal portion to enhance constraining the sheath, e.g., after withdrawing the dilation member(s).