This sounds awesome, as long as it is:
1-time use and buy
Body must be un-id'd
Low HP upon revive
Loud noise upon revive
Disappear upon death, so that other t's can't grab and revive other t's
Only works upon traitors, not innocents or detectives (prevent griefing)
Yus.  
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_________________________________________________________________________________sounds good although i'd remove the "the body must be un-id'd" part, as most people would check the body of a traitor and kind of making the body unuseable
1. I 
wouldn't agree on this, need to be un-id'd since like Lazord said it would be an 
easy advantage for the Innocents too, knowing that that person who got revived was the T they killed before. 
2. I suggest T's should revive un-id'd T buds (Alt+E) for searching secretly, and revive them for back-up or w/e and adding that, 
no one having a clue who. 3. Adding up to other replies, it 
SHOULD be 
1 time use and buy for it is unfair for the other teams against T's when they keep on reviving their T buds. 4. Health upon reviving, 
Badly Wounded or 
Wounded? 
You choose. 
5. Upon reviving as some said, there should be a 
loud noise, this 
might get an advantage of the others to hear where it came from 
though I think others would just say 
'some T revived his T bud' but wouldn't bother to hear where it went from,
6. And reviving one 
should cause the Defib to break like an hp station or just disappear like that (
You choose again), 
If it wouldn't be destroyed/breaked or w/e, this is 
an advantage for the Ts and
 unfair for the 
Innos/
Dets