The present invention relates to a self-expanding device for sealing a defect in a wall, such as a septal defect. The device of the present invention has a helical shaped periphery formed from an elastic wire and at least one eyelet. The eyelet has a non-circular ("asymmetric") shape which allows the...http://www.google.com.au/patents/US6171329?utm_source=gb-gplus-sharePatent US6171329 - Self-expanding defect closure device and method of making and using
