Patent ID: 9186671
Filing Date: 2015-11-17
Classification: B01L

Abstract:
1. A microfluidic test carrier for apportioning a quantity of fluid into sub-quantities, said test carrier comprising: a substrate and a covering layer, and having a capillary structure formed in the substrate that is enclosed by the substrate and the covering layer, wherein the capillary structure comprises a receiving chamber, a sample chamber and a connecting channel between the receiving chamber and the sample chamber; the receiving chamber has two opposite boundary surfaces and a side wall, wherein one of the boundary surfaces has an inlet port and one of the boundary surfaces is a the floor of the receiving chamber and the other boundary surface is a the cover of the receiving chamber; the receiving chamber has an inner zone, a circumferential venting channel, and a circumferential dam positioned horizontally between the inner zone receiving chamber and the venting channel, in which wherein the dam is closer to the inlet port than to the venting channel to the inlet port; the dam is configured such that a capillary stop forming a geometric valve is formed by the dam and the venting channel, and in which the geometric valve is a capillary stop for fluid, but through which air can escape out of the venting channel; and the connecting channel extends between an outflow orifice of the venting channel and an inlet orifice of the sample chamber such that fluid transport is possible from the receiving chamber into the sample chamber, and in which the valve prevents is configured to prevent automatic fluid transport out of the receiving chamber.