Implantable leads with optimized lead body cross-section configuration

摘要

Medical lead body configurations that reduce conductor flexural fatigue. The various lead body embodiments include a support section and can also include other features such as a semi-straight portion of a lumen or semi-straight sides that optimize the reduction in conductor flexural fatigue.

主权项

1. A medical lead comprising a lead body formed from a polymeric material, the lead body comprising:
a coil lumen defined by the polymeric material of the lead body, the coil lumen extending from a proximal portion to a distal portion of the lead body, the coil lumen defined by a coil lumen wall; three cable lumens defined by the polymeric material of the lead body, the three cable lumens comprising a middle cable lumen, a left cable lumen located to the left of the middle cable lumen, and a right cable lumen located to the right of the middle cable lumen, each of the three cable lumens extending from the proximal portion to the distal portion, each of the three cable lumens defined by a respective cable lumen wall, each of the three cable lumens smaller in diameter than the coil lumen; and a support portion formed from the polymeric material of the lead body, the support portion extending longitudinally within the lead body and disposed between the coil lumen and the three cable lumens, the support portion comprising a beam formed from the polymeric material of the lead body, the beam comprising:
an upper border defined in part by the cable lumen walls of the right cable lumen and the left cable lumen, the upper border extending straight from the cable lumen wall of the right cable lumen to the cable lumen wall of the left cable lumen, the upper border located below and remote from the cable lumen wall of the middle cable lumen;a lower border defined in part by the coil lumen wall;a first lateral side defining a first exterior surface of the medical lead; anda second lateral side opposite the first lateral side, the second lateral side defining a second exterior surface of the medical lead,wherein the beam has a minimum thickness defined by the upper border and the lower border, the beam has a width extending from the first lateral side of the lead body to the second lateral side, and the minimum thickness is configured to reduce flexural fatigue of a conductor disposed within any of the coil lumen and the three cable lumens.