Filter type rotor for multistation photometer

Claim 1

In a multistation dynamic photometer system provided with a rotor containing a plurality of cuvets at the outer extremity thereof, means for feeding blood plasma filtrate samples to said cuvets, means for loading reagents into said cuvets, and means for photometrically analyzing the resulting mixtures in said cuvets while said rotor is rotated at a selected high speed, said rotor being of the laminated disc-type having a central sample-loading port, liquid-dividing means, sample-distributing passageways, sample-receiving chambers, sample-sedimentation chamber provided with outlets ports, downstream liquid passageways, and cuvets, all in radial register, the improvement thereupon comprising filter means sealably interposed between the outlets of said sedimentation chambers and said downstream passageways, said sedimentation chambers being located radially centrifugal to said filter means and said filter means being disposed so that the entrant surfaces thereof face generally contracentripetally with respect to the axis of the rotation of said rotor to thus permit cells to sediment free from said filter means and avoid collection of said cells upon the filter means, said sedimentation chambers being provided with respective sediment sumps for collection of said cells.