Patent ID: 7959878

Claim:
A unit cuvette capable of containing a biological fluid for analyzing the biological fluid, the cuvette comprising: means defining a curved raceway located substantially on a bottom of the cuvette, the curved raceway having a concavity that is upwardly directed, the curved raceway having a lowest point located approximately at a center of the curved raceway, and the curved raceway designed to guide an oscillating movement of a ball inserted into the cuvette; attachment means for attaching the cuvette to a first other unit cuvette in a first direction comprising at least a downwardly directed tab provided on an edge of an upper part of the cuvette; and attachment means for attaching the cuvette to a second other unit cuvette in a second direction that is approximately perpendicular to the first direction, comprising: a first overhang that forms an upwardly open hook, and a second overhang that forms a downwardly open hook, wherein: the upwardly open hook is capable of engaging with the downwardly open hook of an adjacent cuvette, the overhangs being provided on a base of the cuvette along two opposed edges orthogonal to the upper edge of the cuvette having the tab.