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Methods and apparatus for generating an electric field inside a patient include at least a first electrode and a second electrode on a common implantable substrate. Each of the electrodes has a respective proximal end and a respective distal end. Electrical energy can be applied that causes electric

Methods and apparatus for generating an electric field inside a patient include at least a first electrode and a second electrode on a common implantable substrate. Each of the electrodes has a respective proximal end and a respective distal end. Electrical energy can be applied that causes electrical current to flow simultaneously through the first and second electrodes preferentially from the proximal end of one electrode to the distal end of the other electrode.

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What is claimed is: 1. An implantable electrode assembly comprising: an implantable substrate; three elongate electrodes secured to the substrate, each electrode having respective proximal and distal opposing ends, wherein the electrodes are relatively situated such that each electrode is generally

What is claimed is: 1. An implantable electrode assembly comprising: an implantable substrate; three elongate electrodes secured to the substrate, each electrode having respective proximal and distal opposing ends, wherein the electrodes are relatively situated such that each electrode is generally uniformly spaced along its length with respect to at least one adjacent electrode, and an inner electrode is flanked on two sides by a pair of outer electrodes; wherein a first lead is connected to the inner electrode at the inner electrode's proximal end positioned on one side of the substrate; and wherein a second lead and a third lead are connected to the outer electrodes at the respective proximal ends positioned on an opposite side of the substrate. 2. The electrode assembly of claim 1, wherein at least a portion of the implantable substrate is flexible. 3. The electrode assembly of claim 1, wherein the three elongate electrodes are general parallel with one another. 4. The electrode assembly of claim 1, wherein each outer electrode is equidistantly spaced with the inner electrode. 5. The electrode assembly of claim 1, wherein distal ends of the outer electrodes are generally collinear with the proximal end of the inner electrode. 6. The electrode assembly of claim 1, wherein the proximal ends of the outer electrodes are generally collinear with a distal end of the inner electrode. 7. The electrode assembly of claim 1, wherein the electrodes are non-linearly disposed along their lengths. 8. The electrode assembly of claim 1, wherein the distal ends of the outer electrodes are-generally collinear with a proximal end of the inner electrode. 9. The electrode assembly of claim 1, wherein at least one of the first, second and third leads is insulated. 10. The electrode assembly of claim 1, wherein the first lead is situated such that the first lead generally extends from a proximal end of the inner electrode towards a distal send of the inner electrode. 11. The electrode assembly of claim 10, wherein the first lead is circumscribed along at least a part of its length by at least a part, of the inner electrode. 12. The electrode assembly of claim 1, wherein the second lead and the third lead are situated such that each lead extends from a proximal end of a corresponding one of the pair of-outer electrodes towards a distal end of the corresponding one of the pair of outer electrodes. 13. The electrode assembly of claim 12, wherein the second lead and the third lead are circumscribed along at least a part of their length by at least a part of the corresponding one of the pair of outer electrodes.