Title:
METHOD AND APPARATUS FOR CONTROLLING FLUID FLOW RATE IN A MICROFLUIDIC CIRCUIT
Document Type and Number:
WIPO Patent Application WO2003000392
Kind Code:
A3
Abstract:
A method and apparatus are disclosed for controlling a flow rate of a fluid sample having an unknown or variable viscosity. The fluid sample is provided as a first fluid flow to a microfluidic channel. A second fluid is provided to the channel as a sheath around the first fluid. In one embodiment, the second fluid is injected between the first flow and an internal surface of the channel. In another embodiment, the second fluid completely circumscribes the first fluid as a parallel or sheath flow. The second fluid has a known viscosity selected for achieving a flow rate. The first fluid flow at the same rate as the achieved flow rate of the second fluid.
Inventors:
WEIGL BERNARD H
BARDELL RONALD L
SCHULTE THOMAS E
BARDELL RONALD L
SCHULTE THOMAS E
Application Number:
PCT/US2002/019482
Publication Date:
March 18, 2004
Filing Date:
June 20, 2002
Export Citation:
Assignee:
MICRONICS INC (US)
International Classes:
B01F5/06; B01F13/00; G01N37/00; B01F13/08; B01J19/00; B01L3/00; B81B1/00; F15C3/04; F15C3/06; F15C5/00; F16K99/00; G01N27/06; B01F11/00; (IPC1-7): B01F5/04; B01F13/00; B01J19/00
Domestic Patent References:
| WO1989001590A1 | 1989-02-23 |
Foreign References:
| US6200814B1 | 2001-03-13 | |||
| US5948684A | 1999-09-07 |
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