and the wing 14 is forced to deform into a compressed shape as it passes through the distal tube 146 the wing 14 maintains its compressed state as it is drawn into the assembly sheath 104 fig1 h illustrates the entire closure device 10 positioned inside the assembly sheath 104 with both wings 12 14 maintained in a compressed state while the assembly sheath is positioned against the distal tube 146 fig1 i illustrates the assembly sheath 104 separated from the compression apparatus 140 the assembly sheath 104 contains the closure device 10 in a compressed state with the closure device 10 compressed within the assembly sheath 104 using any of the compression methods described above or known in the art it is configured for placement within a heart fig1 shows the two upper chambers in a human heart the right atrium 152 and the left atrium 154 separated by an interatrial septum containing a pfo track 156 the interatrial septum includes a septum primum 158 and a septum secundum 160 though the anatomy of pfos varies widely within the population the septum primum 158 often extends to and overlaps with the septum secundum 160 as shown in fig1 when a pfo is present blood may travel through the pfo track 156 between the septum primum 158 and the septum secundum 160 the closure device 10 is introduced into the atria 152 154 of the heart preferably through a minimally invasive percutaneous procedure for example the closure device 10 may be delivered to the atria via percutaneous methods using a delivery catheter first a peripheral vein such as a femoral vein is punctured with a needle a wire is inserted through the needle into the vein and the needle is.