Abstract: A mobility appliance includes a support structure having a proximal end and a distal end, the distal end carrying a ground-contacting peg and includes a weight-bearing body contact element, the body contact element rotating about a pivot axis at the proximal end.

Abstract: An exhaust manifold for a dental handpiece system receives at an inlet thereof return air flow provided by a dental handpiece. A unidirectional valve couples the inlet to a common manifold space which in turn couples to ambient air by way of a filter. By applying filtration on the backside of the unidirectional valve, air entering the common manifold space cannot thereafter reenter the return air conduit and thereby contaminate the same handpiece or other handpieces in a multiple handpiece system. A replaceable filter unit avoids accumulated debris and promotes better sanitary conditions.