Microfluidic liquid sampling device and method of collecting a liquid sample

Liquid sampling device comprising a support structure with a microfluidic arrangement having a liquid reception interface that is fluidly connected to a reservoir chamber by a capillary fluid passageway and a microfluidic valve, the microfluidic valve being connected to a measuring chamber, wherein:

• the liquid reception interface, the capillary fluid passageway, the reservoir chamber and the microfluidic valve are configured to allow liquid entering the liquid reception interface to flow into the reservoir chamber by way of capillary forces in the capillary fluid passageway while being prevented from passing the microfluidic valve unless a predetermined static pressure difference over the microfluidic valve is exceeded,
• the microfluidic valve is a passive valve without moving parts, passing of liquid through the microfluidic valve is controlled by capillary action and a static pressure difference over the microfluidic valve, and
• the capillary fluid passageway and the reservoir chamber are configured and arranged to cause high enough a static pressure at an entrance side of the microfluidic valve that causes a flow of liquid through the microfluidic valve into the measuring chamber once the reservoir chamber is completely filled.