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In an implantable medical device having individual modules, a coupling module couples the modules to one another. The coupling module supports electrical and/or mechanical coupling of the modules. The coupling module may assume a variety of shapes or configurations. The various embodiments of the co

In an implantable medical device having individual modules, a coupling module couples the modules to one another. The coupling module supports electrical and/or mechanical coupling of the modules. The coupling module may assume a variety of shapes or configurations. The various embodiments of the coupling module may offer the modules varying degrees of freedom of movement relative to one another.

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The invention claimed is: 1. An implantable medical device comprising: at least two modules, each of the modules comprising a respective one of at least two housings, wherein each housing in the at least two housings provides a respective space within the housing, each respective space containing o

The invention claimed is: 1. An implantable medical device comprising: at least two modules, each of the modules comprising a respective one of at least two housings, wherein each housing in the at least two housings provides a respective space within the housing, each respective space containing one or more components of the implantable medical device; a coupling module coupled to each of the modules, the coupling module defining at least one lumen between the housings, the at least one lumen connecting the spaces within at least two of the housings; and an overmold that at least partially encapsulates each of the housings and the coupling module, wherein the coupling module permits motion of the two modules along at least one axis of motion. 2. The implantable medical device of claim 1, wherein the coupling module permits motion of the two modules along at least two axes of motion. 3. The implantable medical device of claim 1, wherein the coupling module defines at least two lumens. 4. The implantable medical device of claim 1, wherein at least one of the two modules comprises a control module containing electronic components. 5. The implantable medical device of claim 1, wherein the implantable medical device has a maximum thickness of between approximately 4 millimeters and approximately 8 millimeters. 6. The device of claim 1, further comprising a conductor passing through the lumen that electrically couples the first and second modules. 7. The device of claim 1, wherein the components include a battery, a telemetry module, and a processor. 8. An implantable medical device comprising: a first module comprising a first housing wherein the first housing provides a first space within the first housing, wherein the first space contains control electronics; a second module comprising a second housing, wherein the second housing provides a second space within the second housing, wherein the second space containing one or more components of the implantable medical device; and a coupling module fixedly coupled to the first and second housings, wherein the coupling module is hermetically fixed to the first and second housings, wherein the coupling module is made of a metal that defines at least one lumen between the first and second housings, the at least one lumen connecting the first space with the second space, and wherein the coupling module permits motion of the first housing relative to the second housing along at least one axis of motion. 9. The device of claim 8, wherein the coupling module permits motion of the multiple modules along at least two axes of motion. 10. The device of claim 8, wherein the coupling module defines at least two lumens. 11. The device of claim 10, wherein the lumens comprise co-axial lumens. 12. The device of claim 8, wherein the coupling module defines one of a circular cross-sectional shape, a semi-circular cross-sectional shape and a rectangular cross-sectional shape. 13. The device of claim 8, wherein the coupling module includes a bellows section. 14. The device of claim 8, wherein the coupling module includes at least one of a corrugation, convolution, and a variation in cross-sectional shape. 15. The device of claim 8, wherein the coupling module includes at least a helical portion. 16. The device of claim 8, wherein the metal comprises titanium. 17. The device of claim 8, wherein the coupling module is fixedly coupled to at least one housing with a weld joint. 18. The device of claim 8, further comprising: a third module; and a second coupling module fixedly coupled to the third module and to at least one of the first and second housings. 19. The device of claim 8, wherein the second module comprises a battery. 20. The device of claim 8, wherein the coupling module is fixedly coupled to portions of the housings that are adjacent to one other. 21. The device of claim 8, wherein the coupling module comprises at least one bend. 22. The device of claim 8, further comprising a conductor passing through the lumen that electrically couples the first and second modules. 23. The device of claim 8, wherein the components include at least one of: a battery; a telemetry module; and a processor. 24. An implantable medical device comprising: a first module comprising a first housing, wherein the first housing provides a first space within the first housing, wherein the first space contains control electronics; a second module comprising a second housing, wherein the second housing provides a second space within the second housing, wherein the second space containing one or more components of the implantable medical device; and a coupling module fixedly coupled to the first and second housings, wherein the coupling module is hermetically fixed to the first and second housings and defines at least one lumen between the first and second housings, the at least one lumen connecting the first space with the second space, and wherein the coupling module permits motion of the first housing relative to the second housing along at least one axis of motion. 25. The device of claim 24, further comprising one or more conductors traversing the lumen and connecting components within the first space to components within the second space. 26. The device of claim 24, wherein the components include at least one of: a battery; a telemetry module; and a processor.