“…Hypersensitivity reactions can be seen in patients allergic to nickel; however, it does not constitute a definite contraindication for percutaneous closure. [ 4 ] If percutaneous closure is planned in patients with a known nickel allergy, devices with less nitinol content such as GORE® HELEX® Septal Occluder (W. L. Gore and Associates, Inc., Flagstaff, AZ, USA), CardioSEAL™ (NMT Medical, Inc., Boston, MA, USA) and Atriasept™ (Cardia, Inc., Eagan, MN, USA) can be used alternatively. However, it should be noted that all current approved ASD and PFO closure devices contain nitinol.…”