| http://www.w3.org/ns/prov#value | - Membrane 40 may be installed in the atrial appendage 13 and held therein by attachment apparatus 500, which preferably consists of a pair of flexible wire portions 502 a and 502 b, which are preferably constructed of a material such as nitinol or Elgiloy or stainless steel and having a wire diameter of approximately 0.005 to 0.020 inch.
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