Kidneys are a filter system. The main job of the kidneys is to remove waste from the blood and return the cleaned blood back to the body. Each minute about one litre of blood ï­ one-fifth of all the blood pumped by the heart - enters the kidneys through the renal arteries.
The volume of helium in the balloon has been estimated as being able to lift a total load, including the balloon material and the structure beneath it, of 65 pounds (29 kg) at sea level and 48 pounds (22 kg) at 8,000 feet (2,400 m).
But Inamed Health, a manufacturer of a newer version called the BioEnterics Intragastric Balloon, states on its Web site that its balloon is made of durable, elastic, high-quality silicone.. And the balloons are left in place for only six months to prevent any corrosion.