VANCOUVER, Wash.--(BUSINESS WIRE)--International Rehabilitative Sciences, Inc., d/b/a RS Medical, today announced it has reached an exclusive U.S. agreement to commercialize the Nimbus Concepts, LLC, expandable, multi-tined radiofrequency (RF) ablation device for the treatment of chronic spinal pain. Nimbus Concepts, was founded by practicing pain medicine physicians to develop and patent novel RF electrode technologies designed to increase procedural efficiency and safety, decrease medical cost, and provide the basis for high quality durable pain relief following RF ablation. The initial Nimbus RF device offered to the market is compatible with most existing RF generators requiring no additional or specialized equipment. It has received the CE mark and is pending 501(k) appearance.