Manufacturing method for heart correction net

A manufacturing method of a heart correction net that is fitted to an outside of a heart and inhibits excessive expansion of the heart, the method comprising:

• a first step wherein a direction, in which an apex and a base of the heart are connected, is defined as a layer direction, a cross-sectional image of a cross-section intersecting with the layer direction of the heart is taken with a tomographic device at a plurality of spots spaced apart in the layer direction;
• a second step wherein an outline of the heart is extracted from each of a plurality of the cross-sectional images taken in the first step;
• a third step wherein a direction along an outline of the cross-section intersecting with the layer direction of the heart is defined as a circumferential direction, with respect to a three-dimensional shape reconstructed based on a plurality of the outlines extracted in the second step, a dividing point is defined at a plurality of spots spaced apart in the circumferential direction;
• a fourth step wherein, based on a plurality of the dividing points defined in the third step, a contour of the heart in three-dimension is divided into divided regions, each of the divided regions is surrounded by dividing lines connecting the plurality of the dividing points, while an approximate shape of each of the divided regions is maintained, each of the divided regions is developed on a two-dimensional plane, in which a partial separation between each of the divided regions is tolerated, and development data is created, which includes positional information after development regarding the plurality of the dividing points on the two-dimensional plane;
• a fifth step wherein, based on the development data created in the fourth step, paper-pattern data is created, which is necessary when the heart correction net is knitted with a computerized knitting machine;
• and
• a sixth step wherein, based on the paper-pattern data created in the fifth step, the heart correction net is knitted with the computerized knitting machine.