A medical electrical lead to conduct electrical stimulation and/or signals between an electrical stimulator and a heart site includes an elongated lead body extending to a proximal connector for attachment to the electrical stimulator. An electrode head at the distal end includes an electrode tip member...http://www.google.co.uk/patents/US7212871?utm_source=gb-gplus-sharePatent US7212871 - Epicardial and myocardial leads for implanting in the heart by thoracotomy or port access surgeries with detachable electrode tip
