The key characteristics of the system include:-

· Titanium Alloy/Stainless Steel variants to suit varying requirements and surgical situations.

· Posterior of Anterior use with the same Implant components and Instrumentation.

· Screws available in Monoaxial and Polyaxial versions with buttress threads and tapered core
  diameter for better strength.

· Reduction Screw with uniquely designed tabs permit controlled reduction of the spine. No bulky
  instruments required, increasing tactile feel and permitting direct vgisualization durting procedure.

· Aantomic Hooks are specifically desigened to ensure the best fit available.

· Cages for Degenerative Disc Disease and other reconstructive spinal surgeries.

· The Delivery system (Cases and trays) designed to make the system more user friendly.

· Direct Anchor Attachment-Rod is attached to screw or hook directly in line. This minimizes the
  moment arm and profile, and increases the strength.

· Dual Closure-positive expansion lock is most secure mechanism in the market. The system
  provides multiple points of contact on the rod. Closure mechanism provides footprint to apply
  enough torque to assure rod is seated in the implant.

· Universal anchor attachment- All components utilize the same attachment to the rod, minimizing   confusion and time.

· Top Loading - System components are all top loading, making application and attachment of the   rod more user friendly.

The XEN-21 Spondylolisthesis Reduction screw is designed to complement the XEN-21 Posterior Spinal stabilization implant range. Correction and stabilization of difficult anatomical variations, encountered in higher grades of spondylolisthesis and other such deformities is facilitated by this system. Removable Break-off tabs with internal threads allow the surgeon to approximate the spine to the desired profile and opt to retain the implant to enable posterior stabilization following the procedure.

This device enables the surgeon to:-

1 Eliminate the use of complex approximation devices.
2 Achieve controlled and gradual anatomical reduction of the
   deformity
3 Gain secure insertion of the posterior Rod, into the
   implant construct.


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Rod

The XEN-21 rod comes in pre-cut sizes with hexagonal edges for a better grip. With the rod positioner, who attach to the hex end of the rod positioner, which attaches to the hex end of the rod the rod can be held and rotated with excellent control.

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The XEN-21 Standard Transverse Connector

The XEN-21 Standard Transverse Connector consists of two Connecting Blocks and a Connecting Rod working in a ‘side- Loading’ configuration. The transverse Connecting Rod may be pre-stressed by either compression or distraction to prevent the ‘parallelogram effect’ .

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The XEN-21 Staple Washer

The four pronged XEN-21Staple Washer is used in conjunction with XEN-21 spine screw for anterior interbody fixation. The countersunk base of the washer ensures a low profile while enhancing the bone-screw interface.

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The XEN-21 Infralaminar Hook

The XEN-21 Infralaminar Hook fits the sublaminar space when inserted from the inferior laminar edge. The hook blade takes into account, the caudal slope of the laminae and makes an angle of 30 degrees with the vertical, closely approximating the inferior laminar border. The 5.5mm blade width minimizes intrusion into the spinal canal while allowing a pair of hooks to be used at the same level.

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