Method of folding a cardiac repair structure

A repair structure for cardiac surgery, the repair structure comprising:

• a sheet of harvested pericardial tissue, the sheet comprising:
• a folded edge line that extends from a first end to a second end opposite the first end;
• a first lobe line that extends from a first end to a second end opposite the first end, wherein the first lobe line is parallel to and offset from the folded edge line by a first distance;
• a second lobe line that extends from a first end to a second end opposite the first end, wherein the second lobe line is parallel to and offset from the folded edge line by a second distance;
• a first portion of a first lobe, a first portion of a second lobe, and a first portion of a third lobe, wherein each of the first portion of the first lobe, the first portion of the second lobe, and the first portion of the third lobe is at least partially defined by a corresponding perimeter edge having a shape that is curved, and wherein a starting point and an ending point of the perimeter edge of each of the first portion of the first lobe, the first portion of the second lobe, and the first portion of the third lobe is on or adjacent to the first lobe line;
• a second portion of the first lobe, a second portion of the second lobe, and a second portion of the third lobe, wherein each of the second portion of the first lobe, the second portion of the second lobe, and the second portion of the third lobe is at least partially defined by a corresponding perimeter edge having a shape that is curved, and wherein a starting point and an ending point of the perimeter edge of each of the second portion of the first lobe, the second portion of the second lobe, and the second portion of the third lobe is on or adjacent to the second lobe line;
• a first transverse fold line that extends from a first end disposed at or adjacent to the first lobe line to a second end disposed at or adjacent to the second lobe line, the first end of the first transverse fold line is at or adjacent to the ending point of the perimeter edge of the first portion of the first lobe, and the second end of the first transverse fold line is at or adjacent to the ending point of the perimeter edge of the second portion of the first lobe;
• and
• a second transverse fold line that extends from a first end disposed at or adjacent to the first lobe line to a second end disposed at or adjacent to the second lobe line, the first end of the second transverse fold line is at or adjacent to the ending point of the perimeter edge of the first portion of the second lobe, and the second end of the second transverse fold line is at or adjacent to the ending point of the perimeter edge of the second portion of the second lobe, wherein the first transverse fold line is offset from the first transverse fold line,
• wherein the sheet is folded about the folded edge line such that the first lobe line is aligned with the second lobe line and the perimeter edge of the first portion of the first lobe is aligned with the perimeter edge of the second portion of the first lobe, the perimeter edge of the first portion of the second lobe is aligned with the perimeter edge of the second portion of the second lobe, and the perimeter edge of the first portion of the third lobe is aligned with the perimeter edge of the second portion of the third lobe,
• wherein the first portion of the first lobe and the second portion of the first lobe are folded about the first lobe line and the second lobe line, respectively, to form the first lobe, wherein the first portion of the second lobe and the second portion of the second lobe are folded about the first lobe line and the second lobe line, respectively, to form the second lobe, and wherein the first portion of the third lobe and the second portion of the third lobe are folded about the first lobe line and the second lobe line, respectively, to form the third lobe,
• wherein the sheet is folded about the first transverse fold line and the second transverse fold line such that the first end of the first lobe line is disposed at or adjacent to the second end of the first lobe line and the first end of the second lobe line is disposed at or adjacent to the second end of the second lobe line such that:
• a first side wall is partially defined by the first transverse fold line, a first portion of the first lobe line, and a first portion of the folded edge line,
• a second side wall is partially defined by the first transverse fold line, the second transverse fold line, a second portion of the first lobe line, and a second portion of the folded edge line, and
• a third side wall is partially defined by the second transverse fold line, a third portion of the first lobe line, and a third portion of the folded edge line, and
• wherein a top perimeter edge of each of the first side wall, the second side wall, and the third side wall cooperate to form a triangular shape.