Patent ID: 6880414

Claim:
A cell sort block comprising: a block body, having an open top, an open bottom and an elongate interior chamber; a block face sealed over said body to enclose on four sides the interior chamber; said chamber having a top chamber opening through which droplets may be introduced in a flow stream into said chamber and an open chamber bottom through which droplets leave the chamber and flow into collection containers; a particle deflector disposed to deflect charged droplets that pass through said chamber; a fin having an open fin top facing the housing top opening and a closed fin bottom defining a fin slot, said fin located between the particle deflector and the bottom opening and extending into a depth of said interior chamber such that deflected particles are deflected to one of two sides of said fin and undeflected particles pass into said open fin top; and an aspiration source evacuating air through said fin slot, said aspiration source providing a negative air pressure within said chamber moving air within said interior chamber into said open fin slot.