SPINAL FIXATION DEVICES OF IMPROVED STRENGTH AND RIGIDITY

摘要

This invention relates to spinal implants of improved strength and rigidity. One embodiment relates to U-shaped, top loading spinal rod receivers (10) wherein the threading (14) on the receiver ends above the top of the rod when the rod is in the locked positions. Other embodiments relate to improved thread designs based on minimizing the gap between the minor diameter of the receiver and the minor diameter of the securing member and by ensuring an equal or substantially equal number of full width threads on each of the flanges of the U-shaped receiver.