Flow path device and measurement apparatus

1. A flow path device, comprising:

a plate-like measurement flow path device; and

a plate-like separation flow path device, wherein

the plate-like measurement flow path device includes a first flow path for performing a measurement regarding specific particles on a first fluid including the specific particles, a second flow path for correction through which a second fluid which does not include the specific particles passes, and a third flow path connected to the first flow path,

the plate-like separation flow path device includes a fourth flow path for separating and selecting the specific particles from a sample including the specific particles and collecting a fluid including the specific particles as the first fluid,

the plate-like separation flow path device is located on an upper surface of the plate-like measurement flow path device,

the sample passes through a fifth flow path included in the plate-like measurement flow path device, passes through an opening in the upper surface of the plate-like measurement flow path device, and then flows into the fourth flow path from an opening in a lower surface of the plate-like separation flow path device, and

the first fluid passes through an opening in the lower surface of the plate-like separation flow path device, and then flows into the first flow path from an opening in the upper surface of the plate-like measurement flow path device.

2. The flow path device according to claim 1 , wherein

the sample flows into the fifth flow path from an opening in the upper surface of the plate-like measurement flow path device.

3. The flow path device according to claim 1 , wherein

the fourth flow path includes a fourth main flow path and a plurality of fourth branch flow paths branching from the fourth main flow path, flows a third fluid which does not include the specific particles with the sample, and generates a pressing flow, which can press the sample flowing in the fourth main flow path against a side of the fourth branch flow paths, thereby separating the specific particles and collecting the fluid including the specific particles as the first fluid.

4. The flow path device according to claim 3 , wherein

the third fluid passes through a sixth flow path included in the plate-like measurement flow path device, passes through an opening in the upper surface of the plate-like measurement flow path device, and then flows into the fourth flow path from an opening in the lower surface of the plate-like separation flow path device.

5. The flow path device according to claim 4 , wherein

the third fluid flows into the sixth flow path from an opening in the upper surface of the plate-like measurement flow path device.

6. The flow path device according to claim 1 , wherein

the plate-like measurement flow path device includes a first region and a second region in the upper surface, and

in a plan view, the first flow path is located to extend from the first region to the second region, and the plate-like separation flow path device is located only in the first region.

7. The flow path device according to claim 1 , wherein

a pressing fluid for stirring or pressing the first fluid that has flowed into the first flow path flows into the third flow path.

8. The flow path device according to claim 1 , wherein

a sheet member having a plurality of through holes intervenes between the lower surface of the plate-like separation flow path device and the upper surface of the plate-like measurement flow path device.

9. A measurement apparatus, comprising:

the flow path device according to claim 1 ; and

an optical sensor located to face the plate-like measurement flow path device.

10. The measurement apparatus according to claim 9 , wherein

the optical sensor includes a light-emitting element and a light receiving element.

11. The measurement apparatus according to claim 9 , wherein

the optical sensor is located to be movable in a planar direction with respect to a surface of the plate-like measurement flow path device.