SEPARATION COLLECTION CHIP AND SEPARATION COLLECTION METHOD

摘要

PROBLEM TO BE SOLVED: To reduce an amount of plasma uncollectable by a safety margin layer while preventing blood corpuscles from mixing in a flow path flowing plasma.SOLUTION: The plasma collection chip is provided with: a separation flow path 4 for separating a blood sample S into a plasma layer 21 on one side in the flow path width direction and a corpuscle layer 22 on the other side in the flow path width direction; and a collection flow path 6 which is provided on the downstream side of the separation flow path 4 and has a first flow path part 11 for flowing plasma in the plasma layer 21 and a second flow path part 12 for flowing blood corpuscles in the corpuscle layer 22. The collection flow path 6 has: a cross section change flow path part 9 which is expanded in the flow path width direction and reduced in the flow path thickness direction compared with the separation flow path 4; and a branching wall 17 which is provided on the side of plasma layer 21 away from a boundary surface 23 between the plasma layer 21 and the corpuscle layer 22 which flow in the cross section change flow path 9 branches the cross section change flow path part 9 into the first flow path part 11 and the second flow path part 12.