In some aspects, a modular analyte measurement system having a replaceable strip port module is provided to permit contaminated modules to be replaced. The change rate \u03c6d of an accelerator pedal operation amount \u03c6 is calculated. and 50% RH, a surface electroresistivity of 1\xd7109 \u03a9sq to 2\xd71011 \u03a9sq and a volume electroresistivity of 1\xd71010 \u03a9cm to 2\xd71012 \u03a9cm. The expandable introducer delivers and presses the anchors to the vessel wall during implantation.