Those are NOT loops that Airbus A300 flies to provide some seconds of weightlessness ? they are parabolas. I think it?s a crazy idea to perform the surgery 30seconds at a time?although a bungee-jumper would probably be the best bet since they can handle different pressures on the body externally/internally... NASA does these type of flights to prepare astronauts for working in weightlessness (http://microgravityuniversity.jsc.nasa.gov/museum/). They are also offered through commercial routes: http://www.gozerog.com/home_full1.aspx
Here?s some info on medical practices in the space shuttle:
The Fire Guys Radio Show on 1RBN.com - Show #16
A Medical Doctor/Astronaut from the Johnson Space Center, Mission Specialist Tom Marshburn, talks about Emergency Medicine in Space.
Crazy sounding, but if the surgeons have a notice before the descent stops, they could probably keep too many things from falling on the floor
Perhaps this "research" (or excuse to play in a fancy toy) is to observe what sorts of benefits you could get from the absence of gravity cause of how blood moves around?
Either way, I hope there is a video of them working in the special block on the airbus. Would be interesting to see how the work in 30 second windows.