A single preformed catheter (70) configuration for a dual-chamber pacemaker system is provided. The catheter is formed of a heat-settable biocompatible material such as, for example, polyether polyurethane, and is formed in a predetermined shape to enhance and stabilize atrial electrode contact on the inner wall of the atrium, while also providing stress relief to absorb stresses occasioned by cardiac depolarization and respiration and modulation of the bulk cardiac complex. To this end, the catheter of the present invention includes a first section (64,66) disposed in the superior vena cava (18) to provide substantially stable support to the catheter, a second section (46) disposed in the atrium and being preformed to substantially conform to the inner wall of the atrium, and a third section (30) having a pliancy greater than that of the first two sections and being disposed distally of the second section (46). The first section (64,66) disposed in the superior vena cava (18) may have one of a variety of geometries, including, but not limited to, a plurality of curves, a spiral or helical configuration and a single reverse bend or lobe.
展开▼
