Expandable attachment device and method

Abstract

An attachment device with a radially expandable section is disclosed. The attachment device can have helical threads, for example, to facilitate screwing the attachment device into a bone. Methods of using the same are also disclosed. The attachment device can be positioned to radially expand the expandable section in cancellous bone substantially surrounded by cortical bone.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The application is a continuation of PCT Application No. PCT / US2008 / 003421, filed Mar. 12, 2008, which claims priority to U.S. Provisional Application No. 60 / 906,791, filed Mar. 12, 2007, both of which are incorporated by reference herein in their entireties.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates generally to a device and method for attaching to bones.[0004]2. Description of Related Art[0005]Broken bones, such as compression fractures of one or more vertebrae in the spine, may be treated with internal fixation. Any indication needed spinal stability can also be treated by internal fixation. Examples include scoliosis, kyphosis, spondylothisthesis and rotation, segmental instability, such as disc degeneration and fracture caused by disease and trauma and congenital defects, and degeneration caused by tumors.[0006]As shown by FIG. 1, internal fixation in the spine is often accomplished ...

AI Technical Summary

Problems solved by technology

Backing out or loosening of the fixation screws 12 can cause a reduction of the fixation, up to complete failure or even resulting in additional complications.

Furthermore, the bones are often weak and under heavy loads, the bones can fail and the fixation screws 12 can be ripped from the bone resulting in complete failure and additional damage to the bone.

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