Microfluidic device, and diagnostic and analytical apparatus using the same

A diagnostic and analytical apparatus including a plurality of microfluidic devices with microchannels through which a microfluid flows, the apparatus comprising:

• a main channel through which the microfluid flows;
• and
• a plurality of branch control units which are connected to the main channel and branch off the microfluid from the main channel to flow into the plurality of microfluidic devices,
• wherein each of the branch control units comprises:
• a sub-channel which is connected to the main channel and has a first cross-section that is smaller than a cross-section of the main channel;
• a flow delaying portion which is connected to the sub-channel to allow the microfluid from the sub-channel to enter, has a second cross-section that is larger than the first cross-section of the sub-channel to reduce the interfacial curvature of the microfluid entering from the sub-channel by capillary force and the flow rate of the microfluid, and has a predetermined length extending in a direction in which the microfluid flows;
• and
• a flow recovery portion into which the microfluid from the flow delaying portion flows and has a third cross-section that is smaller than the second cross-section of the flow delaying portion.