Mississippi Patent of the Month – August 2023

Disorders of the bone affecting the spinal column can lead to severe pain, loss of mobility, and nerve damage. To address these challenges, medical implant devices like screws and rods have been widely used to stabilize the spine and alleviate discomfort. In the pursuit of innovation, Zavation Medical Products, LLC has developed a new Modular Screw Assembly.

The modular screw assembly is a versatile system designed to provide spinal stabilization with unmatched efficiency. Comprising a fastener, screw head coupler, retaining ring, and friction ring, this assembly offers a unique and innovative approach to bone anchoring. When the fastener is translated past the screw head, the retaining ring elastically deforms and then snaps around the screw head, providing a secure and robust connection.

One of the key features of this assembly is the use of split rings in both the retaining ring and the friction ring. The split ring design allows for easy assembly and ensures a tight grip on the bone anchor. Additionally, inwardly protruding ribs on the retaining ring further enhance its grip on the screw head after it snaps into place.

The system’s fastener is intelligently engineered, housing all the essential components in a cylindrical shell. Opposing upper arms extend from the shell with threads inside, enabling a connecting rod to be securely fastened using set screws. This design not only provides stability but also allows for easy adjustments and alignment of the connecting rod.

Moreover, the screw head coupler features an axial groove that prevents relative rotation between the fastener and the coupler. Material deformed from the fastener’s remaining wall fills the groove, adding to the system’s strength and preventing any unwanted movement during use.

The modular screw assembly’s simplicity of use and reliability make it an attractive option for spinal stabilization procedures. Its versatility and secure connection not only ensure patient safety but also facilitate streamlined surgical procedures, ultimately reducing the time spent in the operating room.

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