Methods: An advanced study, clinical trial experiment, random assortment, comparision with over 164 patients, age from 16 to 65, ASA I, II, has been indicated upper leg operation. Patients have been desensitized the nervous plexus anethesia with Bupivacain at upper handspike arm, 2mg / kg dose and Adrenalin 1/200000 mixed with adequate purified water 40 ml and divided into 2 groups (n = 82): Group I: Using nervous excitation machine to desensitize, group II: using normal needles to desensitize. Eluminating the effect of restricted feeling, movement, side effects and comparision between two groups.