Raymedica® Releases Evaluation of the Biomechanical Performance of the HydraFlex™ Nucleus Arthroplasty™ Technology

MINNEAPOLIS, (April 25, 2007) — Raymedica, the Pioneer in Nucleus Arthroplasty, announced today that it will present the biomechanical performance of its HydraFlex Nucleus Arthroplasty Technology at Spine Arthroplasty Society 7th  (SAS7) Annual Conference in Berlin, Germany.  The biomechanical performance of the HydraFlex Technology was approached through the testing of the Kinematic Demand, Device Stiffness, Load Sharing, and Endplate Mechanics for a Nucleus Arthroplasty device.  These results will be presented at the Raymedica SAS7 Workshop, May 2nd, Salon 16, Riga Room at 12:30 – 2:00 PM

“Biomechanical performance of the HydraFlex Technology required testing that replicated the complex, coupled motion of the human loads on the lumbar spine.  The series was designed to evaluate the material properties of the HydraFlex Technology across a wide spectrum of biomechanical and biomaterial conditions.  The performance results and material testing of HydraFlex technology continues to reinforce our commitment to device safety and the patient’s quality of life,” stated John J. Viscogliosi, Chairman and Chief Executive Office of Raymedica.

Biomechanical presentations about HydraFlex Technology that will be presented during the Raymedica workshop at the Spine Arthroplasty Society 7th (SAS7) Annual Conference include:

• The study titled, “Principles and Mechanical Requirements? of Nucleus Implants, “ will be presented by Prof. Dr. Hans-Joachim Wilke from the Institute of Orthopaedic Research and Biomechanics, University of Ulm on Wednesday, May 2, 2007 at 12:50 PM
• The study titled, “Kinematic? Demands of Nucleus Arthroplasty,” will be presented by Denis J. DiAngelo, PhD, Department of Biomedical Engineering and Imaging, The University of Tennessee Health Science Center on Wednesday, May 2, 2007, at 1:05 PM.
• The study titled, Device Stiffness vs. Load Sharing with Nucleus Arthroplasty Devices,” will be presented by Brian P. Beaubien, MS, Midwest Orthopaedic Research Foundation and the Gustilo Medical Education Center, Minneapolis, MN. On Wednesday, May 2, 2007 at 1:20 PM.
• The study titled, “Endplate Mechanics in Nucleus Arthroplasty: Biomechanics and Development,” will be presented by Joshua D. Auerbach, MD, Department of Orthopaedic Surgery, The University of Pennsylvania, Philadelphia, PA., on Wednesday, May 2, 2007 at 1:35 PM.
  

About Raymedica
Raymedica, based in Minneapolis, Minnesota, is the Pioneer in Nucleus Arthroplasty having developed the world’s first nucleus replacement device in 1996.  Raymedica develops, manufactures and markets medical device systems designed to treat patients with degenerative disc disease that have been unresponsive to non-surgical treatment.  Raymedica’s products are currently available in many countries worldwide, but are limited to investigational use only in the United States. For more information, visit the Company's website at http://www.raymedica.com.