Ergonomic systems which provide medical therapy, comfort and enhanced function are provided. The wiping cloth has a series of three-dimensional projections which encircles apertures. An axially moveable proximal anchor is carried by the proximal end of the fixation device, to accommodate different bone dimensions and permit appropriate tensioning of the fixation device. The endpoint device adjusts the set of intervals based on the extent of the difference between the collection system time and the endpoint device time to obtain the most accurate intervals.