21 June 2000 Micropump and venous valve by micro stereo lithography
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Micro Stereo Lithography (MSL) is a poor man's LIGA for fabricating high aspect ratio MEMS devices in UV curable semiconducting polymers using either two computer-controlled low inertia galvanometric mirrors with the aid of focusing lens or an array of optical fibers. For 3D MEMS devices, the polymers need to have conductive and possibly piezoelectric or ferroelectric properties. Such polymers are being developed at Penn State resulting in microdevices for fluid and drug delivery. Applications may include implanted medical delivery system, artificial heart valves, chemical and biological instruments, fluid delivery in engines, pump coolants and refrigerants for local cooling of electronic components. With the invention of organic thin film transistor, now it is possible to fabricate 3D polymeric MEMS devices with built-in-electronics similar to silicon based microelectronics.
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Vijay K. Varadan, Vijay K. Varadan, Vasundara V. Varadan, Vasundara V. Varadan, } "Micropump and venous valve by micro stereo lithography", Proc. SPIE 3990, Smart Structures and Materials 2000: Smart Electronics and MEMS, (21 June 2000); doi: 10.1117/12.388901; https://doi.org/10.1117/12.388901

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