An implantable lead is provided with at least one extendable member to position therapy delivery elements, which may be electrodes or drug delivery ports, after the lead has been inserted into the body. The lead may be formed as a resilient element which is contained in a retainer tube that may be removed...http://www.google.ca/patents/US6161047?utm_source=gb-gplus-sharePatent US6161047 - Apparatus and method for expanding a stimulation lead body in situ
