It involved intravenous anesthetic agent like lignocaine is injected in previously exsanguinated limb and with tourniquet inflated. There is a direct diffusion of the local anesthetic from the vessels into the nearby nerves as the drug is not distributed due to circulation blockage by the tourniquet.
Peripheral nerve endings of the extremities are nourished by small blood vessels. Injection of a local anesthetic solution into a venous system results in diffusion of the local anesthetic into the nerve endings with the consequent development of anesthesia. The duration of the anesthesia and analgesia are limited by the duration tourniquet.« Back to Glossary Index