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New Screw Systems Advance Spinal Fixation

By HospiMedica International staff writers
Posted on 28 Aug 2018
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Image: The Zavation Facet Screw System (Photo courtesy of Zavation).
Image: The Zavation Facet Screw System (Photo courtesy of Zavation).
Two new screw systems simplify thoracolumbar, cervical, interbody fusion, and minimally invasive spinal surgery.

The Zavation (Flowood, MI, USA) Facet Screw System is a permanent implant made from a cobalt chrome alloy that is implanted surgically from the posterior approach. The minimally invasive system (MIS) can serve as an all in one solution for bothfusion and fixation, and is intended to provide mechanical support and stability to the implanted level until biologic fusion is achieved. Static and dynamic testing shows that the Zavation Facet system is two times stronger than the predicate.

The Zavation Sacroiliac (SI) System is designed to be a complete fixation system to stabilize the sacroiliac joint. Manufactured from a titanium alloy, the SI screw has an aggressive tip and cutting flute allowing for easy insertion. Multiple lengths (25-50mm in length in 5 mm increments) and cannulated or smooth shank options (30-50mm in 5 mm increments) accommodate variations in patient anatomy. The system also incorporates bone growth windows along the screw's body. The system is specifically designed with a low-profile screw head, which may prevent soft tissue irritation.

“The Facet Screw serves as a fusion and fixation system all-in-one, it makes for an efficient procedure. Both the Facet Screw System and SI Joint Screw System allows for surgeon preference which optimizes flow and functionality in the operating room,” said Jeffrey Johnson, CEO of Zavation.

Posterior decompression and fusion using various screw systems are the standard treatment option for degenerative disc disease and disc herniation. In general, facet screws include a shaft having a lower end, an upper end, and a plurality of threads disposed along an outer wall surface of at least a portion of the shaft. The upper end includes a profile to receive a tool, such as a screwdriver, in order to rotate the shaft into the bone.

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