Patent ID: 8640734

Claim:
A manufacturing method of a flow passage network including a flow passage in which a mother vessel having a radius of α 0 and a first branch and a second branch bifurcated from the mother vessel and having radiuses of α 1 and α 2 , respectively, the method comprising: a first step of setting a diameter D 0 of the mother vessel to 1 and setting a bifurcation angle θ 1 of the first branch to a predetermined value; a second step of calculating a diameter D 1 of the first branch by substituting the diameter D 0 of the mother vessel and a bifurcation angle θ 1 of the first branch set in the first step into cos ⁢ ⁢ θ 1 = a 0 4 + a 1 4 - ( a 0 3 - a 1 3 ) 4 / 3 2 ⁢ a 0 2 ⁢ a 1 2 ; a third step of calculating a diameter D 2 of the second branch by substituting the diameter D 0 of the mother vessel and the diameter D 1 of the first branch calculated in the second step into D 0 3 =D 1 3 +D 2 3 ; a fourth step of calculating a bifurcation angle θ 2 of the second branch by substituting the diameter D 0 of the mother vessel and the diameter D 2 of the second branch calculated in the third step into cos ⁢ ⁢ θ 2 = a 0 4 - ( a 0 3 - a 2 3 ) 4 / 3 + a 2 4 2 ⁢ a 0 2 ⁢ a 2 2 ; and a fifth step of checking whether the diameters D 0 , D 1 , and D 2 and the bifurcation angles θ 1 , θ 2 , and θ 1+2 have been calculated to have correct values by using cos ⁡ ( θ 1 + 2 ) = ( a 1 3 + a 2 3 ) 4 / 3 - a 1 4 - a 2 4 2 ⁢ a 1 2 ⁢ a 2 2 ; and forming the flow passage network comprising the mother vessel, the first branch, and the second branch.