An implantable medical device for use in a patient management system is described, including a sensor capable of measuring a body characteristic and generating a data signal describing the measurement, and a processor configured to analyze the data signal and identify one or more significant events that warrant attention for the well-being of a patient. In an embodiment of the invention, a method for extensible context based user interface simplification can be provided for a model driven development tool. A diode is connected in parallel to the switching element while the cathode thereof is directed to a power supply line. The metrology tools can be installed in a metrology chamber, a process chamber, a transfer chamber, or a loadlock.