Abstract: An ergonomic keyboard device is disclosed which reduces the amount of strain and fatigue in the user. The device consists of a keyboard mounted in a housing, the keyboard having a forward edge, a back edge and a longitudinal axis. The keyboard is moveably mounted to the housing such that the keyboard is moveable in a first direction whereby the keyboard moves forward and back. The keyboard is also mounted to the housing in such a way that it can pivot about its longitudinal axis. The keyboard device also has a mechanism for continuously oscillating the keyboard in both the back and forth motion and in the pivotal motion simultaneously.

Abstract: A vertebral model for illustrating the alignment and misalignment of the spine is disclosed. The model consists of first and second members movably mounted to each other, the first and second members each having a longitudinal axis. The model also has a third member interposed between the first and second members. The first and second members are movable relative to each other between a first position, wherein the first and second members are coaxially aligned, and a second position wherein the first and second members are not coaxially aligned. The model also has a locking mechanism for releasably locking the first and second members in their second position. The first and second members are configured to resemble two adjoining vertebrae, and the third member is configured to resemble an inter-vertebral disc between two adjoining vertebrae. The invention permits the model to illustrate how the vertebra can be placed into and out of alignment.