Microchannels for conducting and expelling a fluid are embedded in a surface of a silicon substrate. A channel seal is made of plural cross structures formed integrally with the silicon substrate. The cross structures are arranged sequentially over each channel, each cross structure having a chevron...http://www.google.com.au/patents/US5989445?utm_source=gb-gplus-sharePatent US5989445 - Microchannel system for fluid delivery
