Analysis device

Claim 1

In a centrifugal device for analyzing a liquid sample, the device comprising a rotor having an axis of rotation, a central receptacle and a plurality of cells circumferentially spaced about the periphery of the central receptacle each of the cells defining interiors and in fluid communication with the central receptacle, said receptacle and said cells being defined by top and bottom plastic disks secured to each other with fluid communication provided by film capillaries formed between adjacent surfaces of the disks, the improvement wherein the film capillaries comprise: a plurality of hydrophilic film capillaries positioned in an annulus about the periphery of the central receptacle and extending radially between each of two circumferentially-spaced cells, a first plurality of hydrophobic film capillaries positioned in the annulus about the periphery of the central receptacle and extending circumferentially between each of said hydrophilic film capillaries and one of said circumferentially-spaced cells, a second plurality of hydrophobic film capillaries positioned in the annulus about the periphery of the central receptacle and extending radially between the central receptacle and each of the circumferentially spaced cells, such that the interior of each of the circumferentially-spaced cells is in fluid communication with one of said hydrophilic film capillaries through one of said first plurality of hydrophobic film capillaries.