Apparatus for analyzing the influence of additive reagents upon the coagulation of blood and related methods

Claim 1

An article of manufacture for use as a blood specimen sample holder in performing optical analysis of the coagulation time of a blood sample, comprising: a longitudinal tubular member fabricated from a transparent rigid plastic having a surface roughness adhesiveness for clotted blood to permit clotted blood to adhere to it, said longitudinal tubular member being symmetrically disposed about an axis and having a closed bottom and an opened top for receiving a blood sample, said member having a plurality of annular walls disposed about the inner surface to form a plurality of chambers with said walls each of a predetermined height and relatively concentric to form a blood sample passageway from the opened top to the closed bottom, whereby when a blood sample is introduced into said opened top and said member is tilted from the horizontal blood will flow into a first chamber until it is filled and overflow over said associated wall into the next chamber and so on until each of said chambers contains a sample pool of said blood.