Patent ID: 7558632
Filing Date: 2009-07-07
Classification: A61N

Abstract:
1. A method of fabricating an implantable multi-conductor endocardial lead extending between proximal and distal ends for use with a cardiac stimulation device, the endocardial lead including a tip electrode at the distal end and a ring electrode proximally spaced from the tip electrode, the method comprising: (a) providing an elongated tubular lead body of flexible resilient insulative material having a first longitudinally extending lumen with an inner diameter; (b) inserting coaxially into the first longitudinally extending lumen an elongated tubular member of flexible resilient insulative material having a second longitudinally extending lumen, the tubular member having an outer diameter smaller than the inner diameter of the first lumen thereby defining an annular cavity; (c) inserting into the annular cavity between the tubular lead body and the tubular member an outer coil conductor extending between the proximal and distal ends thereof; (d) inserting into the second longitudinally extending lumen an inner coil conductor extending between the proximal and distal ends thereof; (e) coupling the tip electrode to the inner coil conductor; (f) coupling the ring electrode to the outer coil conductor; (g) pre-shaping the outer coil conductor into a generally circular looped configuration while maintaining a normally straight configuration for the tubular lead body, the tubular member, and the inner coil conductor when in a free state; and (h) assembling the lead body, tubular member, outer coil conductor, and inner coil conductor such that the resulting endocardial lead is caused to result in a J-configuration at its distal end.