An apparatus for shielding a body structure during surgical procedures which is configured for insertion into the internal passage of a support structure, and includes an elongated body portion with a distal tip portion configured to cover the body structure without substantially displacing the body structure. A door system for a refrigeration unit includes an outer frame and at least two sliding doors having the same size. Each of the storage locations being accessed through an insulated access panel 36 on the side of the storage location 30, the panel 36 being configured to close the storage location 30 from the pathway 35. In addition, the inventive bed comprises an air source that is connected to the valves. The reinforcing ribs divide the interior into separate, independent chambers. An insulated wire is connected to the circular conductive strip and runs to the terminals of two light emitting diodes and then to another conductive strip that is affixed to the internal side of a depression button.