In a word? NOTHING!
The recall of the Realize Band was voluntary and involved only bands that were still sitting on the shelf! Patients that have had Realize Bands placed inside of them definitely DO NOT have to have their band removed. The voluntary recall involved a technical issue with the tubing and the port that to my knowledge had never caused a reportable problem for patients. The company had devised a way to improve the mechanics of their port-tubing connection (i.e. "a better mousetrap") to reduce the chance of a port-tubing disconnection, a problem inherenct with all types of bands.
Here's an interesting fact about the Realize Band that most people don't know. The Realize Band is known outside of the US as the Sweedish Adjustable Gastric Band (SAGB) and was one of the very first adjustable gastric bands EVER developed! So even though the band has only been available in the US for a few years, it has been around a long, long time. In fact, the balloon technology of this band has essentially remained unchanged since it's development which is a testament to its durability.