Systems and methods for delivering a drug or other therapy over an extended period of time are disclosed herein, as are systems and methods for monitoring various parameters associated with the treatment of a patient. One twisted pair communications device includes a plurality of twisted pair connectors each associated with a different twisted pair communication channel, and a multi-channel connector communicatively connected to each of the plurality of twisted pair connectors. The calendar calculator of the present invention is designed for ease of use and for providing information previously unavailable to obstetricians and diagnostic technicians. The engaging sections on each of the two side surfaces are substantially symmetrically arranged with the display panel therebetween, and the positions where the engaging sections are arranged include at least the both end sections in the curving direction, and a display surface intermediate section which includes the intermediate position of the display surface in the curving direction.