Fig. 1

LAMax LAAC™ comprises a hook-embedded anchor and a cover-disc connected with a short central waist (10 mm), and is divided into three types: equal, normal, and plus, with the diameter differences between the cover-disc and the anchor being 0, 6 mm, and 12 mm, respectively. The cover-disc and the anchor were constructed from nitinol mesh and incorporated with Polyethylene terephthalate membrane, and both of them were specially engineered to allow for complete collapse and redeployment ex vivo. The surface of PET membrane was negatively ionized, which reduced the platelet adhesion on the atrial surface of the disc