Importance

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Abstract

A surgical screw system for use with implantation rods includes a screw member, a receiver member, a pressure cap and a locking device. The screw member has a shaft and a head with a spherical undersurface and a conical tapered recess. The receiver member has an upper and lower portion, a u-shaped rod receiving channel and an axial bore. The u-shaped channel has two lateral legs at the upper portion and forms an opening leading to the axial bore. The axial bore near the lower portion includes an inwardly conical tapered surface which has a diameter larger than the shaft of the screw member but smaller than the head of the screw member. The conical surface forms a support upon which the spherical undersurface of the head of the screw member rests when the screw member is guided through the bore of the lower portion of the receiver member. The pressure cap is positioned within the axial bore and situated upon the head of the screw member. The locking device is designed for securing the rod within the u-shaped channel of the receiver member by applying a tightening torque upon the rod when positioned within the opening and the bore near the upper portion of the receiver member.

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First Claim