Abstract: A walker having a frame and wheel system for use indoors or outdoors, with a wheel assemblies allowing for maintaining substantially level performance over uneven surfaces or obstacles. The wheel assembly includes four wheels in a triple pivot, dual offset configuration. With three pivots and the offset axle configuration, the wheel assemblies allow for substantially even contact with all four wheels of the assembly, with weight substantially balanced on each of the four wheels, during use over uneven surfaces, obstacles, or irregularities.

Abstract: A strut component for an orthosis, especially a knee orthosis, takes the form of a deformed ductile metallic tube containing uncured plastics and fibre composite material. The tube has a cross-section which is much longer than its width and with parallel sides, and the composite core is a close-fit within the tube, the internal cross-sectional area of the tube being no more than Kc2 where c is the internal circumference of the tube and k is a number less than or equal to 0.1. When the orthosis is constructed, the strut is shaped to suit the limb to be supported and heated to cure the composite core.

Abstract: A hood, particularly for an emergency escape breathing apparatus and having a box-like appearance, comprises generally planar front and rear panels left and right side panel and a top panel. The panels are made from flexible material, but the box-like shape is maintained by stiffening the front and rear panels by stiffening means. The front panel is formed with a transparent visor. Breathable gas is supplied to the hood via a valve attached to a fitting on the front panel.

Abstract: The invention concerns an elbow lock mechanism for use in artificial arms, comprising a locking bolt which is mounted for axial movement on a carriage which is movable by electric drive means between two positions, there being a spring on the carriage which urges the bolt into its locking position when the carriage is in one position and which urges the bolt into an unlocking position when the carriage is in the other position.