In one embodiment, the present invention provides a cardiac lead device including a fixation mechanism slidably attached to the lead such that when the fixation mechanism is expanded into contact with a body lumen, the lead may be moved relative to the fixation mechanism if desired. Such lead movement...http://www.google.es/patents/US7477946?utm_source=gb-gplus-sharePatente US7477946 - Fixation device for coronary venous lead
