The Amplatzer Occluder

The Amplatzer Occluder is a device which is used to occlude PFO (a patent foramen ovale) and ASD (an atrial septal defect). This clasp is constructed od two "umbrella".
ASD is is a congenital heart defect  in which blood flows between the atria of the heart(1), however PFO is the correct structure which close after birth. Sometimes, PFO can contribute to health problems, for example, paradoxical embolism - it is very dangerous, because it can cause a stroke. 
The Amplatzer closure is a non-surgical procedure, because the Amplatzer device is inserted through the femoral vein. After this intervention, the patients must take anticolaguants ,usually:
acetylsalicylic acid (Acard, Polocard) and Clopidogrel (Plavix) for six months.
Diagnosis of an ASD and PFO can generally be made with TEE (an transesophageal echocardiography)(2).

(1)https://en.wikipedia.org/wiki/Atrial_septal_defect#Patent_foramen_ovale
(2)http://www.kardioserwis.pl/page.php/1/0/show/430/przetrwa%C5%82y-dro%C5%BCny-otw%C3%B3r-owalny-PFO.html