Enriched quantities of male and female sperm are obtained in physically separate fractions utilizing the hydrodynamic behavior of sperm in laminar flow. A flowcell fractionator is provided for performing the method, and includes a specially constructed pipette, valve and infusion pump combination....http://www.google.com.au/patents/US4397954?utm_source=gb-gplus-sharePatent US4397954 - Flowcell fractionator
