A blunt, curved tip helps push the dura away and avoid inadvertent puncture. Straight needle facilitates catheter insertion but may increase the incidence of dural puncture. Reproduced from Morgan GE, Mikhail MS, Murray MJ. Clinical Anesthesiology. 4th ed. Figure 16-18. Available at: www.accessmedicine.com. Copyright © The McGraw-Hill Companies, Inc. All rights reserved.