Improved inflatable device for use in surgical protocol relating to fixation of bone

摘要

An assembly for use in treating a bone is described. The assembly comprises a cannula (26) for establishing a percutaneous access path into the bone and a device (10) adapted to form a cavity in cancellous bone by enlarging from a first condition to a second condition, the first condition permitting passage of the device through the cannula for insertion into bone, the second condition being of a predetermined shape and size sufficient for compressing at least a portion of the cancellous bone so as to form the cavity therein. The device includes at least one component to resist enlargement of the device beyond the predetermined shape and size. The assembly also comprises a catheter (21) which has a size for passage through the cannula and is adapted to drive the device through the cannula into the bone.