The purpose of this guide is to provide you with basic information about filing a utility patent application with the USPTO. The foramen ovale is a hole in the wall between the left and right atria of every human fetus.This hole allows blood to bypass the fetal lungs. Invasive coronary angiography demonstrating patent LIMA graft to the LAD (right). The ductus arteriosus is a hole that allows the blood to skip the circulation to the lungs. To make an appointment with VCS, please contact us at 804.288. If the following information is not complete, correct, or legible, the SA process can be delayed. Most cases of mild to moderate aortic stenosis are probably not amenable to early prenatal diagnosis.