Arjo Maxi 500 Patient Lift with Manual 4-Point DPS (Dynamic Positioning System) and Scale. A Non-AC-Powered Patient Lift. BHM Medical Inc., Magog, QC, Canada. Model KM560181 and Model KM560081 - Maxi 500 with 4-Point Spreader Bar, if it was equipped with the optional scale kit 700.19251.