A self-contained electrolocation apparatus of the present invention includes an electrically conducting needle cannula having a proximal end, a distal end and a hollow bore therethrough. The invention further includes a non-conductive tube having a proximal end and a distal end, the tube being mounted...http://www.google.de/patents/US6325764?utm_source=gb-gplus-sharePatent US6325764 - Bi-level charge pulse apparatus to facilitate nerve location during peripheral nerve block procedures
