During heart surgery there is a contact between blood and air that can generate air bubbles in the blood (Nitrogen has low solubility in blood). These bubbles can produce micro emboli able to damage the brain by blocking blood vessels. For this reason, a new medical device able to solve or at least mitigate this problem is needed. The main solution proposed concerns the use of CO2 as insulant from air. This gas works good for this purpose due to three main factors: it has a higher absorption rate in the blood compared with air (especially Nitrogen), it is relatively cheap and it does not react with anything in the operating room.