Another view of the Guardian Needle. (IMAGE) Medical University of South Carolina Caption Another view of the Guardian Needle, which is being commercialized by Rhythmlink. Credit Photograph by Joshua Aaron Photography, provided by Rhythmlink. Usage Restrictions Use with appropriate caption and credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.