Prevention of external kinking of extradural catheters.
D000767:Anesthesia, Epidural / Q000295:instrumentation / Q000379:methods*; D000773:Anesthesia, Obstetrical / Q000295:instrumentation / Q000379:methods*; D002404:Catheterization / Q000295:instrumentation / Q000379:methods*; D005260:Female; D006801:Humans; D011247:Pregnancy