Resources are available for Maryland residents to help inventors and entrepreneurs learn more about protecting their intellectual property. The skilled team of cardiologists at The Heart Center at Mercy Medical Center in Baltimore, Maryland, provides diagnosis and treatment for patent foramen ovale.Topics on this page. Patents; Patent Application Process. Patent foramen transcatheter repair is a procedure to fix this hole in the heart. Normally, the atrial septum separates the right and left atria. A patent foramen ovale (PFO) is a small opening between the two upper chambers of the heart, the right and the left atrium. A land patent is a land grant from Lord Baltimore or later from the State of Maryland to a person. A patent foramen ovale (PFO) is a small hole between the two upper chambers of the heart, the right and the left atrium. Here's what you need to know.