Specially marked needle to facilitate extradural block.
D000758:Anesthesia; D000767:Anesthesia, Epidural; D000775:Anesthesia, Spinal / Q000600:supply & distribution*; D000776:Anesthesiology; D004864:Equipment and Supplies; D006801:Humans; D009339:Needles
ANESTHESIA, SPINAL/equipment and supplies