The iShares U.S. Medical Devices ETF is seeing unusually high volume in afternoon trading Tuesday, with over 456,000 shares traded versus three month average volume of about 43,000. Shares of IHI were up about 1.6% on the day.

Components of that ETF with the highest volume on Tuesday were Boston Scientific, trading up about 4.1% with over 4.8 million shares changing hands so far this session, and Medtronic, up about 2.5% on volume of over 2.9 million shares. Outset Medical is the component faring the best Tuesday, higher by about 6.7% on the day, while Glaukos is lagging other components of the iShares U.S. Medical Devices ETF, trading lower by about 15%.

For MarketNewsVideo.com, I'm Sayoko Murase.