Microfabricated structures for facilitating fluid...

Details Microfabricated structures for facilitating fluid... Microfabricated structures for facilitating fluid...

2007-08-21

2007-08-21

Wallenhorst, Maureen M. (Department: 1743)

Chemistry: analytical and immunological testing

Including sample preparation

Volumetric liquid transfer

C436S175000, C436S177000, C422S105000, C422S105000

Reexamination Certificate

active

10208297

ABSTRACT:
Fluid introduction is facilitated through the use of a port which extends entirely through a microfluidic substrate. Capillary forces can be used to retain the fluid within the port, and a series of samples or other fluids may be introduced through a single port by sequentially blowing the fluid out through the substrate and replacing the removed fluid with an alternate fluid, or by displacing the fluid in part with additional fluid. In another aspect, microfluidic substrates have channels which varying in cross-sectional dimension so that capillary action spreads a fluid only within a limited portion of the channel network. In yet another aspect, the introduction ports may include a multiplicity of very small channels leading from the port to a fluid channel, so as to filter out particles or other contaminants which might otherwise block the channel at the junction between the channel and the introduction port.

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