The efficiency of the centrifuge (and any other lab equipment, for that matter) depends on timely and routine inspection for damage and wear and tear.
Medical laboratory equipment is rather expensive. So, many healthcare professionals consider the option of used and refurbished medical equipment when purchasing equipment for their medical institutions. Refurbished medical equipment is actually used devices, sent back to the dealer, possibly because of some defect. Such products are often serviced and sold as new at a lower price.