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A sterilizer having a cassette for holding metal instruments or medical devices. The cassette includes a metallic container that defines a sterilization chamber. The container has at least one outer surface. A plurality of spaced-apart, elongated rails extend along the at least one outer surface of

A sterilizer having a cassette for holding metal instruments or medical devices. The cassette includes a metallic container that defines a sterilization chamber. The container has at least one outer surface. A plurality of spaced-apart, elongated rails extend along the at least one outer surface of the container. Each of the rails includes a free, longitudinal edge wherein the edges of the rails lie in a first plane. An insulating shell encases the metallic container and the plurality of rails. An outer surface of the insulating shell lies in the first plane. A receiving unit includes a housing having an outer surface and an inner surface. The inner surface engages the edges of the rails and the outer surface of the insulating shell when the cassette is disposed within the inner housing. A plurality of spaced-apart elongated ribs extends along the outer surface of the housing.

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1. A sterilizer comprised of: a receiving unit having a plurality of spaced-apart frame members, each of said frame members having an inner edge defining a generally rectangular opening extending through said frame member, said frame members disposed such that said openings of said frame members def

1. A sterilizer comprised of: a receiving unit having a plurality of spaced-apart frame members, each of said frame members having an inner edge defining a generally rectangular opening extending through said frame member, said frame members disposed such that said openings of said frame members define a generally rectangular receiving opening; anda generally rectangular cassette dimensioned to be received into said receiving opening of said receiving unit, said cassette comprising: a metallic container defining an internal chamber for holding metal instruments or medical devices to be sterilized, said container having an outer surface,a generally rectangular insulating shell encasing said container, said insulating shell having an outer surface, anda plurality of spaced-apart, elongated rails embedded within said insulating shell, each of said rails extending between said outer surface of said container and said outer surface of said insulating shell, said outer edges defining engaging portions of said cassette that are dimensioned to be disposed adjacent to one or more of said inner edges of said frame members when said cassette is disposed in said receiving unit,wherein said plurality of spaced-apart rails of said cassette and said plurality of spaced-apart frame members of said receiving unit limit expansion of said cassette when said internal chamber of said container is pressurized. 2. The sterilizer as defined in claim 1, wherein an inner edge of one or more of said rails engages said outer surface of said container. 3. The sterilizer as defined in claim 1, wherein said outer edge of one or more of said rails is coplanar with said outer surface of said insulating shell. 4. The sterilizer as defined in claim 3, wherein said receiving unit further comprises: an inner housing dimensioned to be disposed within said receiving opening, said inner housing having an outer surface dimensioned to engage said inner edges of said frame members and an inner surface dimensioned to engage said outer edges of said rails when said cassette expands. 5. The sterilizer as defined in claim 1, wherein said plurality of spaced-apart frame members of said receiving unit are disposed perpendicular to said plurality of spaced-apart, elongated rails of said cassette. 6. The sterilizer as defined in claim 1, wherein said plurality of spaced-apart frame members are disposed parallel to each other. 7. A sterilizer comprised of: a receiving unit having a plurality of spaced-apart frame members, each of said frame members having at least one edge, said frame members disposed such that a plurality of said edges of said frame members define a receiving opening; anda cassette dimensioned to be received into said receiving opening, said cassette comprising: a container defining an internal chamber for holding metal instruments or medical devices to be sterilized, said container having an outer surface,an insulating shell encasing said container, said insulating shell having an outer surface, anda plurality of spaced-apart, elongated rails embedded within said insulating shell, each of said rails extending between said outer surface of said container and said outer surface of said insulating shell, one or more of said rails having an outer edge defining an engaging portion of said cassette that is disposed adjacent to one or more of said edges of said frame members of said receiving unit when said cassette is disposed in said receiving opening,wherein said plurality of spaced-apart rails of said cassette and said plurality of spaced-apart frame members of said receiving unit limit expansion of said cassette when said internal chamber of said container is pressurized. 8. The sterilizer as defined in claim 7, wherein an inner edge of one or more of said rails engages said outer surface of said container. 9. The sterilizer as defined in claim 7, wherein said outer edge of one or more of said rails is coplanar with said outer surface of said insulating shell. 10. The sterilizer as defined in claim 9, wherein said receiving unit further comprises: an inner housing dimensioned to be disposed within said receiving opening, said inner housing having an outer surface dimensioned to engage said edges of said frame members and an inner surface dimensioned to engage said outer edges of said rails when said cassette expands; andan outer housing surrounding said inner housing wherein said frame members extend between said inner housing and said outer housing. 11. The sterilizer as defined in claim 7, wherein one or more of said rails of said cassette extend in a first direction along said at least one outer surface of said container and one or more of said frame members of said receiving unit extend in a second direction, said first direction of said rails being perpendicular to said second direction of said frame members. 12. The sterilizer as defined in claim 7, wherein one or more of said rails is notched along said inner edge to define spaced-apart supports or posts. 13. The sterilizer as defined in claim 12, wherein one or more of said frame members align with said spaced-apart supports or posts. 14. The sterilizer as defined in claim 7, wherein said cassette further comprises, at least one cylindrical sleeve extending through a side wall of said container, anda cup-shaped seal member dimensioned to be received into said at least one cylindrical sleeve. 15. The sterilizer as defined in claim 14, wherein said receiving unit further comprises: a fitting dimensioned to engage said seal member, said fitting for fluidly connecting said internal chamber of said cassette to a steam-generating and steam circulating system. 16. The sterilizer as defined in claim 7, wherein said at least one edge of said frame member is an inner edge defining an opening extending through said frame member. 17. The sterilizer as defined in claim 7, wherein said receiving opening is generally rectangular in shape. 18. A sterilizer comprised of: a receiving unit having an inner surface, said inner surface defining a receiving opening; anda cassette dimensioned to be received into said receiving opening of said receiving unit, said cassette comprising: a container defining an internal chamber for holding metal instruments or medical devices to be sterilized, said container having an outer surface,an insulating shell encasing said container, said shell having an outer surface, anda plurality of spaced-apart, elongated rails embedded within said insulating shell, said rails extending between said outer surface of said container and said outer surface of said insulating shell, one or more of said rails having an outer edge defining an engaging portion of said cassette that is dimensioned to be disposed adjacent to said inner surface of said receiving unit when said cassette is disposed in said receiving opening,wherein said plurality of spaced-apart rails limit expansion of said cassette when said internal chamber of said container is pressurized. 19. The sterilizer as defined in claim 18, wherein an inner edge of one or more of said rails engages said outer surface of said container. 20. The sterilizer as defined in claim 18, wherein said outer edge of one or more of said rails is coplanar with said outer surface of said insulating shell, said outer edge engaging said inner surface of said receiving unit when said container expands. 21. The sterilizer as defined in claim 18, wherein a wall defines said inner surface of said receiving unit, said wall having an outer surface. 22. The sterilizer as defined in claim 21, wherein said receiving unit further comprises: a plurality of spaced-apart frame members, each of said frame members having at least one edge engaging said outer surface of said wall of said receiving unit. 23. The sterilizer as defined in claim 22, wherein said at least one edge of said frame member is an inner edge defining an opening extending through said frame member. 24. The sterilizer as defined in claim 22, wherein said plurality of spaced-apart frame members of said receiving unit are disposed perpendicular to said plurality of spaced-apart, elongated rails of said cassette. 25. The sterilizer as defined in claim 22, wherein said plurality of spaced-apart frame members are disposed parallel to each other. 26. The sterilizer as defined in claim 18, wherein said receiving opening is generally rectangular in shape. 27. A cassette for holding articles to be sterilized, said cassette comprised of: a container defining an internal chamber for holding said articles to be sterilized, said container having an outer surface;an outer insulating shell encasing said container, said insulating shell having an outer surface; anda plurality of spaced-apart, elongated rails embedded within said outer insulating shell, said rails extending between said outer surface of said container and said outer surface of said insulating shell. 28. The cassette for holding articles to be sterilized as defined in claim 27, wherein an inner edge of one or more of said rails engages said outer surface of said container. 29. The cassette for holding articles to be sterilized as defined in claim 27, said rails further comprising an inner edge of one or more of said rails, wherein said inner edge of one or more of said rails is notched to define spaced-apart supports or posts and elongated openings between said supports or posts. 30. The cassette for holding articles to be sterilized as defined in claim 29, wherein said outer insulating shell extends into said elongated openings. 31. The cassette for holding articles to be sterilized as defined in claim 27, said rails further comprising an outer edge of one or more said rails, wherein said outer edge of one or more of said rails is coplanar with said outer surface of said insulating shell. 32. The cassette for holding articles to be sterilized as defined in claim 27, wherein said container is comprised of: a tray section, anda lid section wherein said tray section is attachable to said lid section to define said internal chamber. 33. The cassette for holding articles to be sterilized as defined in claim 32, further comprising: a seal assembly disposed between said tray section and the lid section for sealing said internal chamber. 34. The cassette for holding articles to be sterilized as defined in claim 32, further comprising a seal assembly, wherein said seal assembly is comprised of: a seal element, anda retainer plate for securing said seal element between said tray section and said lid section. 35. The cassette for holding articles to be sterilized as defined in claim 32, further comprising: a latching device for securing said tray section to said lid section wherein said outer insulating shell is disposed between said container and said latching device to thermally isolate said latching device from said container. 36. The cassette for holding articles to be sterilized as defined in claim 27, further comprising: at least one cylindrical sleeve extending through a side wall of said container, anda cup-shaped seal member dimensioned to be received into said at least one cylindrical sleeve. 37. The cassette for holding articles to be sterilized as defined in claim 27, wherein said rails extend in a first direction along said outer surface of said container.