Researchers led by a team at UT Southwestern Medical Center have developed a device that can isolate blood flow to the brain, keeping the organ alive and functioning independent from the rest of the body for several hours.
Note that they're just isolating blood flow. They're not taking the brain out and putting it in a fancy jar.
Not totally clear how this is different than a heart and lung machine that they use during major heart surgery. Sounds like this is mostly an improvement on that, they talk about it replicating the 'pulse' of a heartbeat for example.