A safety interlock for use in a medical device includes a central tubular portion defining a fluid passage for passing fluid through the safety interlock. Channels can be selected by digitizing the broadband signal then digitally filtering to isolate the desired channels. The first substrate is preferably comprised of Ge. The common ring gear is directly connected to the ring gear of the fourth set, and a second planetary carrier rotatably supports the fourth pinion and is directly connected to the ring gear of the third set. Making a mark with the pen can be used to select layer editing functions. The rubber composition contains a polybutadiene having 60 wt % or more of cis-1,4-bonds and 40 or more of a Mooney viscosity ), unsaturated carboxylic acid andor a metal salt thereof, an organic peroxide, and a monophenol based antioxidant.