A sheath is affixed to a body lumen, proximal to an anastomosis site. The sheath includes a sleeve defining a passage. A first ring-shaped member or balloon, attached to a proximal portion of the sleeve, is positioned proximal to an anastomosis and a second ring-shaped member or balloon, attached to a distal portion of the sleeve, is positioned distal to an anastomosis. The sleeve is further elongated from a first length to a second longer length. A method for using the sheath is also disclosed.
