Method for sorting cell particle in solution

A method for sorting a particle of interest in a solution, comprising:

• storing a sample solution comprising a particle of interest in a sample solution reservoir and applying a constant pressure to the sample solution such that the sample solution stored in the sample solution reservoir flows through a sample solution flow path at a predetermined velocity;
• illuminating the sample solution flowing in an illumination region of the sample solution flow path upstream of a branched flow path region where a pair of branched flow paths are connected to the sample solution flow path, and detecting the particle of interest contained in the sample solution by identifying a scattered light or fluorescence generated from the particle of interest;
• and
• upon detecting the particle of interest, opening an electromagnetic valve or electromagnetic valves that are disposed between an air pressure pump and the branched flow path region of the sample solution flow path at a timing that the detected particle of interest reaches the branched flow path region such that a pulse pressure is applied to the branched flow path region to separate the detected particle of interest from the sample solution flow path.