Lumbar Puncture Needles (image) McMaster University Share Print E-Mail Caption This is a photo of the two needles used in lumbar puncture: Left: Conventional. Right: Atraumatic Credit McMaster University Usage Restrictions To be used with this research story. Share Print E-Mail 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.