Patent ID: 8852524

Claim:
A cell counting slide comprising: a) a substantially flat enclosure with a cavity therein, said cavity comprising: (i) a cell counting section bounded by a planar floor and a transparent planar ceiling parallel to said floor and separated from said floor by a gap that accommodates a cell suspension and is sufficiently shallow to permit individual observation of all cells therein through said ceiling; and (ii) a reservoir extending the length of an edge of said cell counting section and having a depth substantially exceeding said gap, said reservoir extending below said planar floor and open to said cell counting section along said entire length; (b) a port in said ceiling opening into said reservoir; and (c) a dam within said reservoir arranged to slow down flow of a cell suspension from said reservoir to said cell counting section, wherein said reservoir has a reservoir floor and said dam is a ridge in said reservoir floor parallel to said edge of said cell counting section, such that a segment of said reservoir floor separates said dam from said edge of said cell counting section, and said dam extends above said segment of said reservoir floor.