Mechanical metaphor for representing parameter constraints graphically for medical devices

A system for representing parameter constraints that govern the values of interrelated parameters includes displays corresponding to a plurality of parameters having a range of values represented by a dimension in the displays. The interrelationship of the parameter constraints is maintained, when one or more of the displays change in value, by means of a software system to make an automatic adjustment while recognizing and maintaining the relationship between the parameters. The system is adjustable on a dynamic basis such that when a user adjusts the parameter either upwards or downwards the remaining interrelated parameters are simultaneously shifted to maintain constraints of the relationships consistent with prior condition before the change.