Patent ID: 8002995

Claim:
A fluid analytical device, comprising: a body rotatable around an axis to generate a centrifugal force; a reservoir, formed on the body; an inlet channel, formed on the body connected to the reservoir; a separation recess, formed on the body radially outward from the reservoir and connected to the inlet channel, wherein the separation recess is a single recess comprising: a pile area; a collecting area, radially located between the pile area and the reservoir, wherein the pile area is in line with and entirely radially outward from the collection area relative to the axis; and a spacing wall, formed between the pile area and the collecting area, wherein the spacing wall is a protrusion protruding into the flow path of the liquid such that a top of the spacing wall is higher than a bottom surface of the pile area and collecting area, and wherein the pile area is further from the axis than the collecting area, and the inlet channel connects to the pile area at a location above the spacing wall; and an exhaust channel connecting the collecting area and the reservoir; wherein the reservoir, separation recess, and inlet channel are arranged such that the centrifugal force moves a liquid from the reservoir to the pile area via the inlet channel, and a first fluid constituent of the liquid remains in the pile area while a second fluid constituent of the liquid moves over the spacing wall to the collecting area due to a specific weight difference therebetween.