A relief rebound drove Boston Scientific Corp. up 6% on positive third-quarter earnings news. But that wasn't enough to recover all the ground that shares (NYSE:BSX) of the Marlborough, Mass.-based medical device giant lost last month on the disappointing next-generation transcatheter aortic valve replacement (TAVR) study results presented at the Transcatheter Cardiovascular Therapeutics (TCT) conference held last month in San Francisco.