Don't let the shorts scare you out of your shares. This is the time to watch, pick your spots, and buy more for your core position and/or trading. NVDQ is a winner and the real deal.
Google article title if interested, it is from FierceBiotech and the title is "NVCA says change or repeal of device tax is likely"
In the long run, it's a bunch of NOISE about nothing. Even if it were to be maintained, the device folks will just raise prices to cover, and that means their revenue will go UP.