Polymer compositions derived from selected monoethylenically unsaturated carboxylic acid monomers, alkyl acrylate ester monomers and alkoxylated acrylate monomers used in certain weight ratios to provide enhanced detergent and cleaning performance are disclosed. When the estimated motor current exceeds the upper limit value equivalent to a heat generation limiting current, the motor current is restricted by restricting a variation in target motor speed outputted to an EDU from an ECU. A process of manufacturing the surface structures includes forming a macromechanical surface on the implant to increase its surface area; and superimposing micromechanical canals on the macromechanical surface, the canals having a size smaller than the minimum size of the osteons in the bone into which the implant is to be inserted. The housing is configured with a plurality of fingers that secure the replaceable battery.