Evaluation of a tapered spinal needle.
D000773:Anesthesia, Obstetrical / Q000295:instrumentation*; D000775:Anesthesia, Spinal / Q000295:instrumentation*; D005260:Female; D006261:Headache / Q000517:prevention & control; D006801:Humans; D008012:Lidocaine; D009339:Needles; D011183:Postoperative Complications / Q000517:prevention & control; D011247:Pregnancy; D012965:Sodium Chloride; D013129:Spinal Puncture
D012965:Sodium Chloride; D008012:Lidocaine