Sperm Sorting Chip

Makarand writes "Microscopically narrow fluid streams running side by side barely mix - a phenomenon put to use in a new stamp size silicon chip for purifying sperm. This technique could find use in infertility clinics where centrifugal technqiues, which can damage fragile sperm, are currently used to purify sperm. Semen and salt water are dripped into etched lanes less than half a millimeter wide from opposite ends of the chip. When the lanes merge, the healthy and wriggly sperm swim into the salt water stream and leave the dead and the disabled sperm behind."