Answers: I found this information online because I have just cardiac experience with adults and dont work within pediatrics. I hope this is helpful:
A PFO can be closed minus the need for surgery, using a small umbrella-like device. The closure device is passed to the heart using a small tube (catheter) inserted contained by a vein at the top of the thigh.
http://www.pfodoctor.org/pages/1/index.h...
This closure method is particularly safe and significant. The procedure can be done with mild sedation and local anesthesia and usually take about 30 minutes to complete. Patients typically travel home the next afternoon and are back to adjectives their usual activities surrounded by a few days.
PFO closure is done in the cardiac catheterization laboratory where on earth special x-ray and ultrasound equipment are used to guide placement of the closure device.
An occluder used to close PFOs is a small umbrella-like device that can be compressed inside a small tube (catheter), placed at the desired location in the heart, and later opened.
The size of the occluder chosen is base on the individual patient anatomy.