In accordance with the present invention, there is provided an implantable surgical device having a deployed shape and an undeployed shape. The device includes an elongated flexible inflatable balloon portion and an elongated flexible and substantially inextensible band portion. The band portion has a distal end, a proximal end and a longitudinal axis therebetween. The band portion is attached to the balloon portion along an inner face thereof. When the device is in its undeployed shape at least a portion of the band portion has a concave cross section taken perpendicular to the longitudinal axis.