I'm afraid you wouldn't. While your companion is more permanent than say, a Summoning Power, it's pretty much the same idea. If you use a Figurine of Wondrous Power, even if you spend a healing surge to give it extra hp, it's not 'you', and attacks to it neither have to test your defenses, nor do they reduce your hit point total. I realize the Bear will suck up your surges, but that's not really the same thing.That renown award is intended for Defenders. Other characters can, on occasion, soak that kind of damage, but you really can't expect to get it as a Leader. If you do, great, but that's a bonus, not something you're likely to get.
Always a GM, never a player (not really but sometimes feels like it).
@nightwalker450The Bear can not go unconscious. Once it is reduced to 0 it disappears. And the Druid would need to spend a surge and a minor action to resummon the Bear.