The present invention relates to a microdevice having a valve structure that contains low or no dead volume. The microdevice comprises a substrate and a cover plate each having a substantially planar contact surface and each contact surface having a fluid-transporting feature associated therewith. The...http://www.google.com.au/patents/US20030015682?utm_source=gb-gplus-sharePatent US20030015682 - Flow-switching microdevice
