a balloon for use in compressing cancellous bone and marrow against the inner cortex of bones whether the bones are fractured or not . the balloon comprises an inflatable , non - expandable balloon body for insertion into said bone . the body has a shape and size to compress at least a portion of the cancellous bone to form a cavity in the cancellous bone and to restore the original position of the outer cortical bone , if fractured or collapsed . the balloon is prevented from applying excessive pressure to the outer cortical bone . the wall or walls of the balloon are such that proper inflation the balloon body is achieved to provide for optimum compression of all the bone marrow . the balloon is able to be folded so that it can be inserted quickly into a bone . the balloon can be made to have a suction catheter . the main purpose of the balloon is the forming or enlarging of a cavity or passage in a bone , especially in , but not limited to , vertebral bodies .