A catheter with a retractable anchor mechanism for providing drugs and/or electrical stimulation to the human body. The catheter has a flexible tubular casing consisting of a outer member and an inner member which enclose at least one lumen. The retractable anchor mechanism is located near the distal...http://www.google.com.au/patents/US5344439?utm_source=gb-gplus-sharePatent US5344439 - Catheter with retractable anchor mechanism
