Patent ID: 6792318
Filing Date: 2004-09-14
Classification: A61N

Abstract:
An implantable cardiac stimulation lead system for use with an implantable stimulation device, the lead system comprising:an elongated lead having a longitudinal axis and including a conductor extending between a distal end and a proximal end of the lead; a tubular insulating sheath overlying the conductor and having an outer peripheral surface of revolution defined by a radius originating at the longitudinal axis; a tip electrode at the distal end of the lead attached to the conductor; a proximal connector in electrical continuity with the stimulation device and coupled to the conductor; the tubular insulating sheath formed with a passive fixation feature formed into the outer peripheral surface for encouraging tissue ingrowth, wherein no portion of the passive fixation feature extends radially from the longitudinal axis by a distance greater than the radius of the tubular insulating sheath and wherein the passive fixation feature is defined by a distally facing annular lip adjacent the outer peripheral surface, a proximally facing annular lip adjacent the outer peripheral surface spaced from and opposed to the distally facing annular lip, and an intermediate continuous concavely curved annular surface extending between the distally facing annular lip and the proximally facing annular lip, a maximum radial dimension between a plane of the outer peripheral surface and the concavely curved annular surface being less than the longitudinal dimension of the concavely curved annular surface.