By combining the LIGA technique with processes used in the manufacture
of micromembranes, micromembrane pumps have been built with pump cham
bers 100 mu m in height and with pump membrane diameters between 2 and
5 mm. The pump case is made of gold, whereas the 2.7 mu m thin pump m
embrane consists of titanium. The passive microvalves of the pump cons
ist df patterned micromembranes arranged one over the other and made o
f titanium and polyimide by use of thin-film techniques. The micropump
has been tested so far with an external pneumatic drive. Both air and
water have been pumped.