A catheter pump includes a catheter channel communicating with a distal end portion of the catheter for alternatingly leading fluid in proximal and distal directions. The lubricant compositions of this invention comprise a synergistic combination of a dispersed, hydrated, alkali metal borate and at least one phosphorous-containing compound wherein the total phosphorous employed in the composition is no more than about 0. Light is projected through a translucent surface of the step pad. This ability gives the transistors excellent linearity which results in high signal quality and limits errors in transmitted data. The analog section is driven by the registers and makes a comparison between the predetermined values and actual operational parameter values.