Stimuplex® HNS Compact is used during preoperative stimulation of nerve fibers in living organism for performing peripheral nerve blocks. This device is used in conjunction with specialized stimulation needles. The device generates predefined electrical pulses at the tip of the stimulation needle. When the stimulation needle is placed sufficiently close to the target nerve the desired muscle contractions can be observed so that the physician can inject the anesthetic in the proximity of the nerve to achieve an effective nerve block.