San Diego-based N Spine, an angel backed firm developing medical devices for back surgery, has been acquired by Synthes. Synthes said that it would pay $30M for N Spine, with earn out worth up to $45M based on achievement of milestones and product sales. N Spine has received funding from the Life Science Angels and the Tech Coast Angels. According to Synthes, N Spine's organization and staff will remain in San Diego. N Spine's medical devices are used to treat lumbar spinal disorders.