A magnetically navigable catheter includes a sheath having a proximal end and a distal end, and an extension member having a proximal end and a distal end, slidably mounted in the sheath so that the distal end portion of the extension member telescopes from the distal end of the sheath. The distal end...http://www.google.de/patents/US6385472?utm_source=gb-gplus-sharePatent US6385472 - Magnetically navigable telescoping catheter and method of navigating telescoping catheter
