Wheel protector to avoid rear derailleur entangling

I know there are plastic protectors (better name ?) to prevent the chain from dropping inside from the cassette (I have one)
But can you get extra large rear wheel 'protectors' that might stop a rear derailleur from entangling with the wheel (major malfunction) ?
I just had this problem (probably RD too short for amount of teeth). It wouldn't have stopped the malfunction (chain went outside the pulley) but if it may have stopped it entangling with the wheel that would have been something ? I think entangling with the wheel bent the RD and dropout to the max.
But can you get extra large rear wheel 'protectors' that might stop a rear derailleur from entangling with the wheel (major malfunction) ?
I just had this problem (probably RD too short for amount of teeth). It wouldn't have stopped the malfunction (chain went outside the pulley) but if it may have stopped it entangling with the wheel that would have been something ? I think entangling with the wheel bent the RD and dropout to the max.
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You may find that MTB's have larger disks than road bikes, but I think that for it to stop a derailleur it would need to be huge.... If you adjust your mech correctly and set the stops, you should never need it.
Spoke protectors, rookie rings, pie dish are the polite versions, none of my bikes use one and none of the ones I've built for family members do, number of incidences, NIL.
retired 9.6kg Carrera Kraken
The Carrera Hardtail combined thread - come on all you Carrera's!
The Sons Scott Genius RC20 build
http://www.parktool.com/blog/repair-help/rear-derailleur-adjustment#article-section-2