Electro-mechanical machines for use in the medical field, namely, to assist human users by employing computerized motion control to provide highly responsive power assistance, or resistance, in the nature of lifting, translating, rotating, squeezing, pushing, pulling, walking, or extending on virtual surfaces in space in the nature of lines, splines, planes, cones, curved surfaces or lines, or other shapes relating to movement performed by humans, that guide or limit motion for the purpose of assisting with medical services and for treating patients for tasks, namely, inserting, lifting, reaching, walking, standing, moving, assembling, picking, pushing, guiding, mounting, grasping, rolling, steering, remote controlling, training, or rehabilitating in the medical field