C. Tourniquet

"The wound should be irrigated immediately, and any visible pieces of the spine or integumentary sheath should be removed. Other first aid measures include control of any bleeding and hot water immersion therapy...If the pain does not respond to hot-water immersion, then oral, or more often parenteral, analgesia is required. However, local infiltration of the wound with local anesthetic without epinephrine, or a regional nerve block may be more effective."

  -- Tintinalli, JE. Emergency Medicine:  A comprehensive study guide. McGraw-Hill. 6th Edition. page 1212