Patent ID: 6813521
Filing Date: 2004-11-02
Classification: A61N,Y10T

Abstract:
A medical electrical lead system, comprising:a lead body having a plurality of lead body lumens; an electrode head assembly, fixedly engaged with the lead body, having an electrode head assembly lumen with an inner wall, the electrode head assembly lumen communicating with a first lead body lumen of the plurality of lead body lumens; a first conductor extending within the first lead body lumen and the electrode head assembly lumen; an insulating member, extending through the electrode head assembly lumen and the first lead body lumen, electrically isolating the first conductor; a drive shaft extending through the first lead body lumen and the electrode head assembly lumen; a sealing member having an outer diameter corresponding to the inner wall of the electrode head assembly lumen, the sealing member having an inner lumen receiving the drive shaft, an outer sealing member fixedly engaged with the inner wall of the electrode head assembly, and an inner sealing member engaged with the drive shaft to provide a low friction seal; a first electrode electrically coupled to the first conductor by the drive shaft; an engaging member positioned along the drive shaft and having a front surface; a flange portion extending along the front surface of the engaging member; a retraction flange, wherein rotation of the drive shaft causes the flange portion to engage the retraction flange so that rotation of the drive shaft is absorbed by the first conductor; a second conductor extending within a second lead body lumen of the plurality of lead body lumens; a second electrode, positioned along the electrode head assembly, having a deformation coupling the second electrode to the second conductor and transferring traction forces applied to the lead body to the electrode head assembly; a third electrode extending along the electrode head assembly and the lead body; a third conductor extending within a third lead body lumen of the plurality of lead body lumens; and an attachment member coupling the third electrode and the third conductor and transferring traction forces applied to the lead body to the electrode head assembly.