Test apparatus, injection method, and microchannel device

A test apparatus for testing a test solution containing a sample, the test apparatus comprising:

• a microchannel device, the microchannel device including:
• a first opening for receiving a test solution;
• one or more branch channels wherein each branch channel of the one or more branch channels communicates with the first opening;
• a plurality of microchannels wherein each microchannel of the plurality of microchannels has a first end and a second end, wherein the first end communicates with at least one of the one or more branch channels;
• an agent in one or more of the plurality of microchannels;
• a collection portion for collecting at least a portion of the test solution, the collection portion disposed at an end of each of the branch channels;
• a second opening disposed in the collection portion;
• a third opening disposed at each second end of the plurality of microchannels;
• the test apparatus further comprising:
• a pipet nozzle;
• a pump configured to inject the test solution through the first opening into the microchannels by applying an air pressure via the pipet nozzle such that the test solution can react with the agent;
• an opening and closing mechanism for opening and closing the second opening;
• a controller programmed to control the pump, the pipet nozzle, and the opening and closing mechanism, wherein the controller controls the opening and closing mechanism such that the second opening closes with the third opening opened and wherein the controller controls the pump and the pipet nozzle such that the pump and the pipet nozzle injects the test solution into the microchannels, then controls the opening and closing mechanism such that the second opening opens after the test solution is injected into the microchannels and then controls the pump such that the pump applies an air pressure to collect the test solution from each branch channel of the one or more branch channels into the collection portion.