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An implantable medical device includes a housing; at least one module enclosed within the housing and configured to at least one of generate an electrical stimulation therapy for delivery to a patient or monitor a physiological parameter of the patient; one or more feedthroughs extending through the

An implantable medical device includes a housing; at least one module enclosed within the housing and configured to at least one of generate an electrical stimulation therapy for delivery to a patient or monitor a physiological parameter of the patient; one or more feedthroughs extending through the housing; a header assembly including one or more electrical connectors electrically coupled to the module via the feedthroughs; and a preformed gasket compressed between the housing and the header assembly forming a seal to electrically isolate the feedthroughs from an external environment.

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1. An implantable medical device comprising: a housing;a module enclosed within the housing and configured to at least one of generate an electrical stimulation therapy for delivery to a patient or monitor a physiological parameter of the patient;a plurality of feedthroughs extending through the hou

1. An implantable medical device comprising: a housing;a module enclosed within the housing and configured to at least one of generate an electrical stimulation therapy for delivery to a patient or monitor a physiological parameter of the patient;a plurality of feedthroughs extending through the housing;a header assembly including one or more electrical connectors electrically coupled to the module via the feedthroughs;one or more compression-fit connectors electrically coupling the feedthroughs to the electrical connectors, wherein each of the compression-fit connectors comprises an electrically conductive spring member forming a central aperture, the spring member deformed to receive a corresponding feedthrough in its central aperture and form an electrical connection with the corresponding feedthrough;a preformed gasket compressed between the housing and the header assembly forming a seal to electrically isolate the feedthroughs from each other and from an external environment; anda set of brackets secured to the housing and extending into the header assembly,wherein the header assembly further includes a set of slots configured to mate with the set of brackets,wherein the header assembly further includes a snap-on tab within each of the set of slots, andwherein each snap-on tab is configured to bend and slide past at least a portion of a corresponding bracket and is configured to mate with the corresponding bracket. 2. The implantable medical device of claim 1, wherein the preformed gasket is elastically deformed as compressed between the housing and the header assembly. 3. The implantable medical device of claim 1, wherein the preformed gasket comprises a silicon material. 4. The implantable medical device of claim 1, wherein the preformed gasket comprises a polyether resin. 5. The implantable medical device of claim 1, wherein the preformed gasket is bonded to the header assembly such that the header assembly and the preformed gasket serve as a unitary component. 6. The implantable medical device of claim 1, wherein the preformed gasket includes a plurality of apertures corresponding to the feedthroughs, wherein each feedthrough extends through a different one of the apertures. 7. The implantable medical device of claim 1, wherein the header assembly is a lead connector assembly. 8. The implantable medical device of claim 1, wherein the preformed gasket compressed between the housing and the header assembly electrically isolates the feedthroughs from each other and from the external environment without the need for backfilling or a wet adhesive during the assembly of the housing and the header assembly. 9. The implantable medical device of claim 1, wherein the feedthroughs extend from the housing in a generally perpendicular direction relative to the housing,wherein the central apertures of the plurality of compression-fit connectors electrically coupling the feedthroughs to the electrical connectors receive the feedthroughs in the generally perpendicular direction relative to the housing, andwherein the preformed gasket is compressed between the housing and the header assembly in the generally perpendicular direction. 10. The implantable medical device of claim 9, wherein the plurality of compression-fit connectors each include a cylindrical housing forming the central aperture with the central aperture being coincident with a central axis of the cylindrical housing. 11. An implantable medical device, comprising: a housing;a module enclosed within the housing and configured to at least one of generate an electrical stimulation therapy for delivery to a patient or monitor a physiological parameter of the patient;a plurality of feedthroughs extending through the housing;a header assembly including one or more electrical connectors electrically coupled to the module via the feedthroughs;one or more compression-fit connectors electrically coupling the feedthroughs to the electrical connectors, wherein each of the compression-fit connectors comprises an electrically conductive spring member forming a central aperture, the spring member deformed to receive a corresponding feedthrough in its central aperture and form an electrical connection with the corresponding feedthrough; anda preformed gasket compressed between the housing and the header assembly forming a seal to electrically isolate the feedthroughs from each other and from an external environment,wherein the preformed gasket, when in a non-compressed state, includes a projection around a perimeter of the gasket, the projection facing the header assembly and functioning to concentrate sealing force between the gasket and the header assembly at the perimeter of the gasket. 12. The implantable medical device of claim 11, further comprising: a set of brackets secured to the housing and extending into the header assembly; anda set of pins extending through the brackets and into the header assembly to secure the header assembly to the housing at a position that compresses the preformed gasket between the housing and the header assembly. 13. The implantable medical device of claim 12, wherein the preformed gasket includes a set of apertures corresponding to the brackets, wherein each bracket extends through a different one of the apertures. 14. The implantable medical device of claim 11, further comprising a set of brackets secured to the housing and extending into the header assembly, wherein the header assembly includes a set of slots configured to mate with the set of brackets,wherein the header assembly further includes a snap-on tab within each of the set of slots, andwherein each snap-on tab mates with a corresponding bracket to mechanically secure the header assembly to the housing. 15. The implantable medical device of claim 11, wherein the header assembly comprises a lead connector assembly, wherein the electrical connectors each include one or more connector blocks, wherein the electrical connectors each define an opening configured to receive a medical lead. 16. The implantable medical device of claim 11, further comprising means for mechanically securing the header assembly to the housing. 17. A method of manufacturing an implantable medical device, the implantable medical device comprising: a subassembly including: a substantially sealed housing, a module enclosed within the housing and configured to at least one of generate an electrical stimulation therapy for delivery to a patient or monitor a physiological parameter of the patient, a plurality of feedthroughs extending through the housing, and a set of brackets secured to the housing;a header assembly including one or more electrical connectors, a set of slots configured to mate with the set of brackets, and a snap-on tab within each of the set of slots; anda preformed gasket configured to electrically isolate the feedthroughs from each other and from an external environment when the header assembly is mounted to the substantially sealed housing,wherein the method comprises:positioning the preformed gasket between the header assembly and the housing;positioning the header assembly on the housing and pressing the header assembly on to the housing to form a plurality of electrical connections with a plurality of compression-fit connectors between the feedthroughs and the electrical connectors and compress the preformed gasket between the header assembly and the housing to form a seal that electrically isolates the feedthroughs from each other and the external environment,wherein each of the compression-fit connectors comprises an electrically conductive spring member forming a central aperture, the spring member deformed to receive a corresponding feedthrough in its central aperture and form an electrical connection with the corresponding feedthrough; andwherein pressing the header assembly onto the housing comprises pressing the header assembly onto the housing until each snap-on tab bends and slides past at least a portion of a corresponding bracket and mates with the corresponding bracket to mechanically secure the header assembly to the housing and to maintain the seal provided by the preformed gasket. 18. The method of claim 17, wherein the preformed gasket is elastically deformed as compressed between the housing and the header assembly. 19. The method of claim 17, wherein the preformed gasket comprises a silicon material. 20. The method of claim 17, wherein the preformed gasket comprises a polyether resin. 21. The method of claim 17, wherein the preformed gasket is bonded to the header assembly such that the header assembly and the preformed gasket serve as a unitary component. 22. The method of claim 17, wherein the preformed gasket includes a plurality of apertures corresponding to the feedthroughs, wherein each feedthrough extends through a different one of the apertures once the header assembly is secured to the housing. 23. The method of claim 17, wherein the header assembly is a lead connector assembly. 24. The method of claim 23, wherein the electrical connectors each include one or more connector blocks, wherein the electrical connectors each define an opening configured to receive a medical lead. 25. The method of claim 17, wherein positioning the header assembly on the housing to compress the preformed gasket between the header assembly and the housing electrically isolates the feedthroughs from each other and from the external environment without the need for backfilling or a wet adhesive during the assembly of the housing and the header assembly. 26. The method of claim 17, wherein the feedthroughs extend from the housing in a generally perpendicular direction relative to the housing, andwherein positioning the header assembly on the housing to form the plurality of electrical connections with the plurality of compression-fit connectors between the feedthroughs and the electrical connectors and compress the preformed gasket between the header assembly and the housing to form a seal that electrically isolates the feedthroughs from each other and from the external environment comprises positioning the header assembly on the housing in the generally perpendicular direction to simultaneously insert the feedthroughs into the respective central apertures of the compressive-fit connectors to form the plurality of electrical connections with the plurality of compression-fit connectors and press the preformed gasket between the header assembly and the housing. 27. A method of manufacturing an implantable medical device, the implantable medical device comprising: a subassembly including: a substantially sealed housing, a module enclosed within the housing and configured to at least one of generate an electrical stimulation therapy for delivery to a patient or monitor a physiological parameter of the patient, and a plurality of feedthroughs extending through the housing;a header assembly including one or more electrical connectors; anda preformed gasket configured to electrically isolate the feedthroughs from each other and from an external environment when the header assembly is mounted to the substantially sealed housing, wherein the preformed gasket, when in a non-compressed state, includes a projection around a perimeter of the gasket, the projection facing the header assembly and functioning to concentrate sealing force between the gasket and the header assembly at the perimeter of the gasket,wherein the method comprises:positioning the preformed gasket between the header assembly and the housing;positioning the header assembly on the housing to form a plurality of electrical connections with a plurality of compression-fit connectors between the feedthroughs and the electrical connectors and compress the preformed gasket between the header assembly and the housing to form a seal that electrically isolates the feedthroughs from each other and the external environment,wherein each of the compression-fit connectors comprises an electrically conductive spring member forming a central aperture, the spring member deformed to receive a corresponding feedthrough in its central aperture and form an electrical connection with the corresponding feedthrough; andmechanically securing the header assembly to the housing to maintain the seal provided by the preformed gasket. 28. An implantable medical device comprising: a housing;a module enclosed within the housing and configured to at least one of generate an electrical stimulation therapy for delivery to a patient or monitor a physiological parameter of the patient;a plurality of feedthroughs extending through the housing;a header assembly including an electrical connector electrically coupled to the module via the feedthroughs;a plurality of compression-fit connectors electrically coupling the feedthroughs to the electrical connectors, wherein each of the compression-fit connectors comprises an electrically conductive spring member forming a central aperture, the spring member deformed to receive a corresponding feedthrough in its central aperture and form an electrical connection with the corresponding feedthrough;means for electrically isolating the feedthroughs from each other and from an external environment; anda set of brackets secured to the housing and extending into the header assembly,wherein the header assembly further includes a set of slots configured to mate with the set of brackets,wherein the header assembly further includes a snap-on tab within each of the set of slots, andwherein each snap-on tab is configured to bend and slide past at least a portion of a corresponding bracket and is configured to mate with the corresponding bracket. 29. The implantable medical device of claim 28, wherein the means for electrically isolating the feedthroughs from each other and from the external environment comprises means for electrically isolating the feedthroughs from each other and from the external environment without the need for backfilling or a wet adhesive during the assembly of the housing and the header assembly. 30. The implantable medical device of claim 28, wherein the feedthroughs extend from the housing in a generally perpendicular direction relative to the housing,wherein the central apertures of the plurality of compression-fit connectors electrically coupling the feedthroughs to the electrical connectors receive the feedthroughs in the generally perpendicular direction relative to the housing, andwherein the preformed gasket is compressed between the housing and the header assembly in the generally perpendicular direction.