Patent ID: 7867453

Claim:
A gravity-driven fraction separator for accomplishing an accurate and automatic quantification/separation of micro-volumes of fluids, comprising: a substrate; and a microchannel structure, extending on the substrate, further comprising: at least one main channel, extending on the substrate that slopes with respect to a horizontal level by a specific angle; at least one loading well, at an upstream of the at least one main channel, for receiving the micro-volumes of fluids and enabling the micro-volumes of fluids to fill into the at least one main channel; a plurality of manifolds, formed in an area at a downstream of the at least one main channel, each of the manifolds being connected to the at least one main channel; at least one pit, formed inside on the at least one main channel and between any two immediately adjacent manifolds connecting to the at least one main channel, the at least one pit comprising a circular recess having a diameter equal to or less than that of the at least one main channel; and a plurality of reservoirs, disposed respectively at the ends of the plural manifolds, for receiving the micro-volumes of fluids.