Metal injection molding of spinal fixation systems components

Abstract

A method of making a component of a spinal fixation system. The method may comprise providing a mixture of a powder of at least one metal or metal alloy and a polymeric binder. A metal-injection-molding process may use the mixture to form a component for a spinal fixation system. The components may have varying flexibility across their cross-sections. Also, components are provided that are produced by this process, such as spinal fixation rods and plates.

Description

FIELD OF THE INVENTION [0001] Embodiments of the invention relate to methods for fabricating components for use in spinal fixation systems. More particularly, the embodiments relate to the use of metal-injection-molding to produce rods and plates having complex geometries for use in spinal fixation systems. BACKGROUND [0002] The spinal (vertebral) column is a biomechanical structure composed primarily of ligaments, muscles, vertebrae, and intervertebral discs. The biomechanical functions of the spinal column include (i) support of the body; (ii) regulation of motion between the head, trunk, arms, pelvis, and legs; and (iii) protection of the spinal cord and the nerve roots. Damage to one or more components of the spinal column, such as an intervertebral disc, may result from disease or trauma and cause instability of the spinal column. To prevent further damage and overcome some of the symptoms resulting from a damaged spinal column, a spinal fixation device may be installed to stab...

AI Technical Summary

Benefits of technology

[0006] What is needed is an improved method to fabricate spinal fixation systems, and systems so fabricated that have a variable flexibility across their cross-section. Additionally, what is needed are components for spinal fixa

Problems solved by technology

Damage to one or more components of the spinal column, such as an intervertebral disc, may result from disease or trauma and cause instability of the spinal column.

There are some disadvantages associated with the use of rigid spinal fixation devices, including decreased mobility, stress shielding (i.e. too little stress on some bones, leading to a decrease in bone density), and stress localization (i.e. too much stress on some bones, leading to fracture and other damage).

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