Here is my take on a dialysis machine (from Fresenius Medical care)
Once I made engraved Lego bricks as name /profession tag for my partner in life, (She works at a clinic as nurse with these machines) , soon everyone at her work knew about my hobby and my Lego hobby seems like a constant amusement and discussion topic for her colleagues. She often get the question: What does he build now? So I just decided to go for something familiar for them (and unfamiliar for me as a builder).
I hope you like it.. im not THAT happy with the build (or the crappy picture), it was pretty much a table scrap build and I also was forced to do some late alterations with the brick in hand to please her so it was more close to the "real thing".