Abstract: A hyperbaric apparatus for the hyperbaric application of therapeutic gases is provided which consists of a generally integral housing which defines an internal chamber. This generally integral housing includes several openings. Removable closures are provided for removable attachment to the housing for the sealing of each of these openings. One such closure includes a limb introduction and sealing mechanism. Also provided are gas inlet and outlet mechanisms connected to the housing for the introduction, control and maintenance of therapeutic gases within the internal chamber of the housing.