Patent ID: 7349742
Filing Date: 2008-03-25
Classification: A61B,A61N

Abstract:
1. An implantable lead configured for placement within a tunnel formed in subcutaneous non-intrathoracic tissue, comprising: a lead body; a cardiac electrode supported by the lead body, the cardiac electrode configured for one or both of sensing cardiac activity and delivering cardiac stimulation energy from a location within the tunnel; and an expandable fixation element provided on the implantable lead and comprising a material that undergoes a volumetric change when placed in subcutaneous non-intrathoracic tissue, the expandable fixation element configured to expand by body fluid absorption and to chronically secure one or both of the cardiac electrode and the lead body within subcutaneous non-intrathoracic tissue defining the tunnel by tissue in-growth into pores of the expandable fixation element.