Patent ID: 9221051
Filing Date: 2015-12-29
Classification: B01L,F16K

Abstract:
1. A microfluidic element for analyzing a fluid sample, said microfluidic element comprising a substrate and a microfluidic transport system having a channel structure, the microfluidic transport system being enclosed by the substrate and a covering layer, wherein the channel structure comprises a channel with two side walls, and a chamber which adjoins the channel, the channel comprises a channel section and a valve section adjoining the channel section, the two side walls run parallel to each other in the channel section, the chamber has a chamber wall with an inlet orifice in which area of the chamber wall is greater than area of the inlet orifice in the same plane, and the chamber has a chamber side wall that adjoins the chamber wall, the inlet orifice in the chamber wall adjoins the valve section, so that a fluid can flow out of the channel through the inlet orifice of the chamber wall and into the chamber, the valve section is provided with a fluid transport cross-section that enlarges in width in a flow direction, wherein in width, the fluid transport cross-section of the valve section at the inlet orifice is larger than a fluid transport cross-section in the channel section at a transition from the channel section to the valve section, and wherein the fluid transport cross-section of the valve section enlarges continuously from the transition to the inlet orifice, and an end of the valve section, which has dimensions which differ from the chamber, forms a capillary stop such that a fluid flowing through the channel is stopped at the end of the valve section at the inlet orifice of the chamber, and wherein the valve section has a length l, which is at least three times a distance b between side walls of the valve section at the transition from the channel section to the valve section.