Devices using an expandable body with internal restraint for compressing cancellous bone

摘要

A device for compressing cancellous bone within a vertebral body is described. The device comprises an elongated expandable body (300) having an elongated axis. The expandable body includes an internal membrane (320) that directs expansion of the body to expand into an irregular shape that, when expanded, comprises a first region having a first expanded diameter, a second region having a second expanded diameter and a third region having a third expanded diameter. The first and third expanded diameters are greater than the second expanded diameter and the first and third regions are separated by the second region.