- degenerative disc disease (defined as back pain of discogenic origin with degeneration of the disc confirmed by history and radiographic studies),
- spondylolisthesis, trauma (i.e., fracture or dislocation),
- spinal stenosis, curvatures (i.e., scoliosis, kyphosis or lordosis),
- tumor, pseudarthrosis,
- and/or a failed previous fusion.
The Elaris Pin polymer can be ultrasonically deposited through the Elaris Pedicle Screw in skeletally mature patients as an adjunct to fusion for the indications listed above.
In the Elaris Pedicle Screw System, the Elaris Pin is made of a biocompatible and fully bioresorbable Poly-Llactide-co-D, L-lactide (PLDLLA) and can be inserted intraoperatively into the Elaris screw’s cannulation. Using the BoneWelder, mechanical pressure and ultrasonic vibrations are applied during a maximum of 8 seconds to the Elaris Pin through the Elaris Handpiece connected to the pedicle screw head resulting in the ultrasonic heating of the polymer so that it melts and is extruded out of the fenestrations of the screw.
An automatic spring mechanism in the Elaris Handpiece supplies consistent force to extrude the polymer from these distal openings into the surrounding cancellous bone (indicated by the orange color in the image above).
The liquid polymer solidifies immediately upon contact with bone, forming a confined, solid ring around the tip of the screw. The entire process lasts only a few seconds. Because the polymer is bioresorbable, it undergoes the natural physiologic process of hydrolysis, and is gradually metabolized into H2O and CO2.
Bench and animal testing have demonstrated that the polymer enhancement provides appropriate dynamic pullout strength for up to 52 weeks as well as improved resistance to toggle loosening compared to screws without additional fixation. Testing also has demonstrated that the pedicle screws can be removed as needed after polymer enhancement.
“The FDA clearance of the Elaris Pedicle Screw System marks a significant milestone for SpineWelding AG, demonstrating that the BoneWelding technology platform provides an adjunct to fusion in skeletally mature patients for the screw’s cleared indications,” said Dr. Joerg Mayer, managing director of SpineWelding AG.
“The Elaris system with ultrasonic fixation provides an adjunct to fusion in the pedicle screws in skeletally mature patients where additional fixation is needed. The ability to make an intra-operative decision to ultrasonically provide adjunctive fixation to individual screws with a seamless process, without disrupting the flow of the case is extremely attractive to surgeons,” commented Dr. Frank M. Phillips, Rush University Medical Center.