The NuMED Z-5 Atrioseptostomy catheter is engineered for maximum steering and tracking. The dual lumen shaft design provides pushability, coupled with exceptional pull strength. This new innovation in Atrioseptostomy catheter design is of potential importance in patients who are subject to a small left atrium and in small neonates with congenital heart disease requiring Atrioseptostomy.This balloon is micro-thin for low deflated profile that maintains tip flexibility. The Inflation of the balloon is controlled by volume.