This "problem" comes up from time to time ... and a half-hour spent reviewing this forum (Biomed databases) might offer up a few
clues about how to proceed ... but (regardless of which "system" is being used - and "old-hat" or not) the best way has always been for
one person to sit down and spend a few hours (or days - as long as it takes) to sort it out.
"Design by committee" is definately
not the answer here.
Other than that, draw up (set down) your "rules" - then stick to them.
But I'm intrigued ... which new system have you gone for? And does it not offer some sort of guidance (or even
restrictions) about how to enter your data? Formats, codes, templates ... whatever?
You have mentioned user department names. Those should be easy enough (as there are never
that many). In a well-designed system, you enter your preferred names just once, and then refer to those (in a pull-down - or look-up - list) when needed. In other words, you should only need to enter any data like that just the one time.
The "trouble" with the global categorisation systems (like the one RoJo has pointed to) is that they are often a bit OTT for local (hospital) BME use. I have found them more suited to new hospital projects, and the like.
Lastly, if I were "starting again from scratch", I think I would consider a hierarchical system for BME equipment identification:-
Class -> Sub-class
etc. etc.... just a thought. But again, probably "over-kill" for the typical in-house BME situation, where the simple (and traditional) method usually works well enough:-
Manufacturer -> Model -> Equipment Type
... and I'm guessing that it's the "Equipment Type" (class) bit that you're grappling with at the moment. What did you do before (how did the old system handle this - or was it just the usual "mess")?
If you want, send your .xls spreadsheet to me and I'll take a look. Can't be fairer than that!