As part of your advertising promo over there in London, why don't you BUY each hospital a cheap PC to be used for nothing but reading your devices? They wouldn't hook it up to their network or anything. Use it for no other purpose than your USB device reading. You need very little PC horsepower to do this. A slow processor, minimal memory, no harddrive even. Boot with a Linux LiveCD. You should be able to buy such a minimal PC for only a few hundred dollars ($300) in the US, I don't know what UK prices would be. Even some old anchient used thing would meet your needs processing-wise (you probably would want USB2 ports though).

As you probably guessed, I'm an engineer and suggest "some old anchient used thing" based on a functionality analysis. Such a device may be perfectly workable, but not esthetically compatible with the corporate image you want to present.