The authors present a microfluidic device towards an integrated patch-clamping assay. The device replaces conventional glass patch pipette with a buried microfluidic channel on silicon substrate. The microchannel fabrication involves reforming doped glass under heat and pressure, a process, in principle, analogous to the heat-pulling/polishing of glass patch pipettes. Unlike etching substrate, this process leaves a smooth glass surface for seal formation with cell membrane. The microchannel is evolved from a trapped void inside the trench during nonconformal deposition of the doped glass. The results of seal formation with mammalian cells captured at such microchannel opening are presented. (c) 2006 American Institute of Physics.
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