Agree. BSX usually seems to be sold in anticipation of, and/or actual release of, good news. It goes up when there's no good reason- usually after 5-10% pullbacks. One theory is that institutions are continuing to want "in" on this stock and they buy at the right time( ie after traders complete their speculations). A better opportunity early in the week might be MDT on the FDA recall thing.
I think Monday could be a gainer in anticipation of a good report. BSX does well on news and announcements, and then ebbs when things get quiet again. I try to discriminate between the important announcements in cardiology from those that don't matter at all to the stock action, like anything having to do with endoscopes. The 15th was a buying opportunity, this week I hope to take profits, then wait for the next lull to buy.