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A feedthrough assembly is disposable in an aperture of, for example, a power source encasement. In various examples, the feedthrough assembly comprises a ferrule, an insulator, a terminal conductor, and a sleeve. A portion of the terminal conductor extends through the ferrule thereby creating a por

A feedthrough assembly is disposable in an aperture of, for example, a power source encasement. In various examples, the feedthrough assembly comprises a ferrule, an insulator, a terminal conductor, and a sleeve. A portion of the terminal conductor extends through the ferrule thereby creating a portion internal to and a portion external to the encasement. The insulator is disposed within the ferrule and is sealably engaged with the terminal conductor portion extending through the ferrule. The sleeve is disposed over the internal portion of the terminal conductor and coupled thereto. In one example, the sleeve includes at least one notch on a sleeve first end or a sleeve second end, which may be used to weld or solder the sleeve to the terminal conductor. In another example, the sleeve includes a longitudinally extending void, which may be used to crimp the sleeve to the terminal conductor.

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What is claimed is: 1. An implantable medical device comprising: an encasement having at least one aperture therethrough; an electrical power source in the encasement configured to provide power to electrical circuitry of the implantable medical device; a feedthrough assembly at least partially pos

What is claimed is: 1. An implantable medical device comprising: an encasement having at least one aperture therethrough; an electrical power source in the encasement configured to provide power to electrical circuitry of the implantable medical device; a feedthrough assembly at least partially positioned in the encasement aperture, the feedthrough assembly comprising, a terminal conductor at least partially passing through the encasement aperture and extending from an internal portion disposed within the encasement to an external portion disposed outside the encasement, the terminal conductor including an outer surface; an insulator disposed within at least a portion of the encasement aperture and surrounding at least a portion of the terminal conductor extending through the encasement aperture; and a sleeve extending from a sleeve first end to a sleeve second end and having a sleeve intermediate portion therebetween, the sleeve including an inner surface engaged against the outer surface of the internal portion of the terminal conductor from near the sleeve first end to at least a midpoint of the sleeve substantially half way between the sleeve first end and the sleeve second end; and a conductive connection member physically connected and electrically coupled to an outer surface of the sleeve, wherein the conductive connection member laterally approaches and laterally physically contacts the outer surface of the sleeve; wherein the feedthrough assembly provides a conductive path extending between an interior of the encasement and a location outside of the encasement. 2. The implantable medical device as recited in claim 1, wherein the conductive connection member is electrically coupled to the sleeve at a member first end portion and electrically coupled to the electrical power source at a member second end portion. 3. The implantable medical device as recited in claim 2, wherein one or both of the sleeve or the conductive connection member comprise stainless steel. 4. The implantable medical device as recited in claim 2, wherein the outer surface of the sleeve includes a substantially flat portion to engage against a portion of a substantially flat conductive connection member. 5. The implantable medical device as recited in claim 4, wherein the substantially flat portion extends from near the sleeve first end to near the sleeve second end. 6. The implantable medical device as recited in claim 1, wherein the sleeve includes at least one weld or solder notch at one or both of the sleeve first end or the sleeve second end. 7. The implantable medical device as recited in claim 6, wherein the at least one weld or solder notch includes a dimensional length of at least 0.012 inches. 8. The implantable medical device as recited in claim 1, wherein the sleeve includes a longitudinally extending void; and comprising a crimp securing the sleeve to the outer surface of the terminal conductor, the crimp occurring by way of the longitudinally extending void. 9. The implantable medical device as recited in claim 1, wherein the internal portion of the terminal conductor includes one or more grooves extending inward from the outer surface thereof; and wherein the sleeve is configured to be deformable into the one or more grooves. 10. The implantable medical device as recited in claim 1, wherein the sleeve first end includes an introductory opening having a first diameter, the first diameter narrowing to a diameter larger than the outer diameter of the terminal conductor at or near the sleeve intermediate portion or the sleeve second end. 11. The implantable medical device as recited in claim 1, wherein the terminal conductor comprises molybdenum. 12. The implantable medical device as recited in claim 1, wherein a length of the sleeve as measured from the sleeve first end to the sleeve second end is at least about 0.055 inches. 13. The implantable medical device as recited in claim 1, wherein the inner surface of the sleeve is engaged against the outer surface of the terminal conductor from near the sleeve first end to near the sleeve second end. 14. The implantable medical device as recited in claim 1, wherein the sleeve is configured to laterally surround the internal portion of the terminal conductor from near the sleeve first end to near the sleeve second end. 15. The implantable medical device as recited in claim 1, wherein the sleeve comprises at least one of stainless steel, aluminum, or titanium. 16. The implantable medical device as recited in claim 1, wherein the terminal conductor comprises at least one of titanium, tantalum, platinum, iridium, zirconium, aluminum, or stainless steel. 17. The implantable medical device as recited in claim 1, wherein the terminal conductor comprises a material having a coefficient of the thermal expansion substantially the same as a coefficient of the thermal expansion of the insulator. 18. An implantable medical device comprising: an encasement having at least one aperture therethrough; an electrical power source in the encasement configured to power to electrical circuitry of the implantable medical device; a feedthrough assembly at least partially positioned in the encasement aperture, the feedthrough assembly configured to provide a conductive path extending between an interior of the encasement and a location outside of the encasement, the feedthrough assembly comprising, an insulator disposed within a portion of the encasement aperture; a terminal conductor extending through the insulator, the terminal conductor having an internal portion disposed within the encasement and an external portion disposed outside of the encasement, the internal and external portions separated by a terminal conductor portion positioned within the insulator; a sleeve extending from a sleeve first end to a sleeve second end, the sleeve including an inner surface directly coupled to an outer surface of the internal portion of the terminal conductor from near the sleeve first end, through a midpoint of the sleeve substantially half way between the sleeve first end and the sleeve second end, to near the sleeve second end; and a conductive connection member physically connected and electrically coupled to an outer surface of the sleeve, wherein the conductive connection member laterally approaches and laterally physically contacts the outer surface of the sleeve. 19. The implantable medical device as recited in claim 18, comprising a ferrule in contact with the encasement on an outer ferrule surface and in contact with the insulator on an inner ferrule surface. 20. The implantable medical device as recited in claim 18, wherein the sleeve includes at least one notch extending from one or both of the sleeve first end or the sleeve second end. 21. The implantable medical device as recited in claim 20, comprising a weld or solder configured to secure the sleeve to the outer surface of the terminal conductor; and wherein the weld or solder is disposed adjacent the at least one notch. 22. The implantable medical device as recited in claim 18, wherein the sleeve includes a longitudinally extending void; and comprising a crimp securing the sleeve to the outer surface of the terminal conductor, the crimp occurring by way of the longitudinally extending void. 23. The implantable medical device as recited in claim 18, wherein the internal portion of the terminal conductor includes one or more grooves extending inward from the outer surface thereof; and wherein the sleeve is configured to be deformed into the one or more grooves. 24. The implantable medical device as recited in claim 18, wherein the outer surface of the sleeve is electrically coupled to one of a cathode assembly or an anode assembly of the electrical power source; and the inner surface of the sleeve is electrically engaged with the internal portion of the terminal conductor. 25. The implantable medical device as recited in claim 18, wherein the conductive connection member includes a member first end electrically coupled to the outer surface of the sleeve and a member second end electrically coupled to one of the cathode assembly or the anode assembly. 26. The implantable medical device as recited in claim 25, wherein the outer surface of the sleeve is configured to mate with a portion of the conductive connection member. 27. The implantable medical device as recited in claim 25, comprising a weld between the outer surface of the sleeve and the conductive connection member.