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A housing for an implantable tissue stimulating device is connectable to an electrode lead having an electrode. A portion of the housing also functions as an electrode. The walls of the housing are shaped so that when a voltage is applied between the electrode at the electrode lead, and the housing

A housing for an implantable tissue stimulating device is connectable to an electrode lead having an electrode. A portion of the housing also functions as an electrode. The walls of the housing are shaped so that when a voltage is applied between the electrode at the electrode lead, and the housing electrode, the electric field associated with the voltage has a low field strength in regions at which unwanted stimulation of muscles can occur.

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1. A biocompatible housing for an implantable tissue stimulating device having an electrode lead with an electrode: said housing being adapted for connection to said electrode lead and said stimulating device generating a voltage between said housing and said electrode, said voltage having an electr

1. A biocompatible housing for an implantable tissue stimulating device having an electrode lead with an electrode: said housing being adapted for connection to said electrode lead and said stimulating device generating a voltage between said housing and said electrode, said voltage having an electric field associated therewith, said housing comprising:a first wall having a generally flat first exterior surface, said first wall being adapted to face the skin of a patient when said housing is implanted;a second wall having a generally flat second exterior surface; anda circumferential third wall joining said first wall and said second wall, said third wall being composed of conductive material and adapted for electrical contact with surrounding tissue when said housing is implanted to serve as an electrode, said third circumferential wall having a curved first circumferential wall section connected to said first wall and a curved second circumferential wall section connected to said second wall and substantially opposing circumferential wall portions between said curved first and second wall sections, said first circumferential wall section having a radius of curvature smaller than a radius of curvature of said second wall section, for curve radii in planes substantially perpendicular to said first surface and said second surface, causing said electric field to have a lower field strength along said second circumferential wall section than along said first circumferential wall section and a spacing between the first wall and second wall being less than a spacing between said substantially opposing wall portions of the circumferential third wall.2. A housing as claimed in claim 1 wherein said first wall is composed of conductive material and is adapted to be an electrical contact with surrounding tissue for serving as an electrode in combination with the electrode formed by said third wall.3. A housing as claimed in claim 1 wherein said second wall is composed of conductive material and is adapted to be an electrical contact with surrounding tissue for serving as an electrode in combination with the electrode formed by said third wall.4. A housing as claimed in claim 1 wherein each of said first circumferential wall section and said second circumferential wall section is circularly curved in said planes.5. A housing as claimed in claim 4 wherein said first circumferential wall section has a center of curvature along a continuous first curve, and wherein said second circumferential wall section has a center of curvature along a continuous second curve.6. A housing as claimed in claim 5 wherein said first curve and said second curve are substantially parallel.7. A housing as claimed in claim 1 wherein the respective curve radii of said first circumferential wall section and said second circumferential wall section in said planes is in a range between 1:2 and 1:6.8. A housing as claimed in claim 7 wherein said ratio is approximately 1:4.9. A housing as claimed in claim 1 wherein said first surface is rough.10. A housing as claimed in claim 1 wherein said first surface is contoured.11. A housing as claimed in claim 10 wherein said first surface has a plurality of exterior ridges.12. A housing as claimed in claim 11 wherein each of said ridges has at least one edge with a sharp corner.13. A housing as claimed in claim 1 wherein said second surface is polished.