Patent ID: 7243384

Claim:
An apparatus, comprising: a frame configured to form a closed loop, the frame being moveable between a coiled configuration and an uncoiled configuration; a sleeve configured to receive the frame, the sleeve defining an opening within at least a portion of the closed loop; a membrane coupled to the sleeve, the membrane defining a substantially planar surface within the closed loop and extending across the opening defined by the sleeve from a first location proximate a perimeter of the opening to a second location proximate the perimeter of the opening on an opposite side of the opening; and a plurality of attachment mechanisms coupled to at least one of the sleeve or the membrane and configured to removably couple a body membrane to at least one of the sleeve or the membrane, each attachment mechanism from the plurality of attachment mechanisms having a first end and a second end, the first end of each attachment mechanism from the plurality of attachment mechanisms coupled to at least one of the sleeve or the membrane at a first location associated with that attachment mechanism and proximate the perimeter of the opening defined by the sleeve, the second end of each attachment mechanism from the plurality of attachment mechanisms coupled to at least one of the sleeve or the membrane at a second location associated with that attachment mechanism and proximate the perimeter of the opening defined by the sleeve such that each attachment mechanism from the plurality of attachment mechanisms extends across the opening defined by the sleeve.