Amplatzer septal occluder (ASO): Lateral aspect. Left and right discs (blue arrows), central core (red arrow) [50].

Contexts in source publication

Context 1

... Amplatzer Septal Occluder (ASO) is the standard of care tool for minimally invasive atrial septal defect (ASD) closure. As illustrated in Fig. 3, the ASO is a double-disc occluder comprised of nitinol mesh and polyester material. To model a virtual ASO, the signed distance function (SDF) is employed to create implicit surfaces, which returns the minimum possible distance from pointˆppointˆ pointˆp to the surface it describes. When the sample pointˆppointˆ pointˆp is inside the ...

Context 2

... implicit surface functions are first defined, including torus, cone, round box, capped and rounded cylinders, and prism. Then, various implicit surface blending operations such as smooth union, subtraction and intersection are designed to merge multiple simple implicit surfaces to model comprehensive geometric surfaces such as the ASO tool. Fig. 3, which is created with a smooth union of seven capped cylinders and one round cone. The smooth factors are set between 0.01 and 0.04. The modeled ASO can detach the delivery cable under user control, which is demonstrated in Fig. 4 (c). The ASO is designed to securely appose the septal wall between left and right atria and create a ...