No one buys entire systems, at least not from us. The parts, though, are always needed. Some of these systems are going on 15 years old. Things wear out and break, but brand new systems for hospitals are super expensive so they want what they have repaired. Also due to the age, some of these systems and parts arent made anymore, you have to salvage stuff from other systems.
So..yeah. Lots of big hospitals still have these in chicago. Stroger, Childrens Memorial...several others. Er...scratch Childrens. They just had their systems removed last month.