Patent ID: 7074239

Claim:
An implant, comprising: a membrane of resorbable polymer base material having a first side, a second side, a thickness measured between the first side and the second side ranging from about 0.5 mm to about 3 mm, and a perimeter edge joining the first side to the second side, wherein first and second points are disposed on opposing sides of the perimeter edge, the membrane of resorbable polymer base material being adapted to be rolled to bring the first point into proximity with the second point to thereby form a rolled membrane of resorbable polymer base material; a plurality or apertures disposed in the membrane of resorbable polymer base material, the plurality of apertures being substantially distributed over at least a portion of both the first side and the second side of the membrane of resorbable polymer base material, apertures of the plurality of apertures having widths ranging from about 500 microns to about 3000 microns and defining fluid-flow paths from the first side to the second side; and a window formed in the membrane of resorbable polymer base material, the window having a dimension greater than about 5 mm.