Founded in 2002, Impulse Monitoring, Inc. (IMI) was among the first companies to provide onsite and Web-based monitoring of the neurological systems of patients undergoing spinal and brain-related surgeries. Known as intraoperative neurophysiological monitoring, or IONM, it is a technique that changed the standards of care for these patients by reducing the risk of permanent neurological damage. Purchased in 2011, Impulse is a wholly owned subsidiary of NuVasive, Inc.