First of all, I can't resist the opportunity to say that I would strip naked in the middle of the airplane concourse if it would prevent a terrorist from getting on my plane.
I've flown a lot, before and after band surgery, and I've also been through scanners at courthouses. TSA and other security people are well accustomed to dealing with people who have medical implants. I have a Lap-Band patient ID card and also have no problem showing a (female) security agent my port incision. A trick I learned/adapted from an acquaintance who has a prosthetic leg is to tell the agent in advance, "I have a medical implant."
In all my world travels in the past (USA, Canada, UK, Europe, India, Asia, South America, the Caribbean), I have been treated roughly or disrespectfully by airport security agents on only 2 occasions (in Korea & Peru). Never in the USA. If the new, more sensitive scanners detect your band or port, you're not going to be handcuffed, thrown into a locked room and beaten with a billy stick. If you miss your flight because of additional security procedures, it's not the end of the world. But if the new scanners miss the terrorist in seat 14A, it could very well be the end of your world.
Now that we're (at least temporarily) past my strong opinions on this subject, I do suggest that you get to the airport 30-60 minutes earlier, in case the new scanning procedures slow down traffic through the security checkpoint.
Jean McMillan c.2009-2013 - Always a bandster at heart
author of Bandwagon (TM), Strategies for Success with the Adjustable Gastric Band & Bandwagon Cookery
Read my blog at: jean-onthebandwagon.blogspot.com