| Spinal Fixation Devices |
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A spinal fixation device in which sleeves or spacers are placed over or around spinal rods in order to obtain better reduction of spinal fractures or spinal deformities. The sleeves can be made in various thicknesses so that the surgeon can obtain optimum fixation in each case. The sleeves can be made of any biologically compatible material. A spinal fixation device is a resorbable interbody fusion device for use in spinal fixation is disclosed. The device is composed of 25-100% bioresorbable or resorbable material. The interbody fusion device of the invention can be in any convenient form, such as a wedge, screw or cage. Preferably, the resorbable device of the invention is in the shape of a tapered wedge or cone, which further desirably incorporates structural features such as serrations or threads better to anchor the device in the adjoining vertebrae. The preferred device further comprises a plurality of peripheral voids and more desirably a central void space therein, which may desirably be filled with a grafting material for facilitating bony development and/or spinal fusion, such as an autologous grafting material. As the preferred material from which the resorbable interbody fusion device is manufactured is most likely to be a polymer that can produce acidic products upon hydrolytic degradation, the device preferably further includes a neutralization compound, or buffer, in sufficiently high concentration to decrease the rate of pH change as the device degrades, in order to prevent sterile abscess formation caused by the accumulation of unbuffered acidic products in the area of the implant. |
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