US 2015/0266226 A1Published application

Sheath Flow Methods

AssigneeThe Government of the United States of America, as represented by the Secretary of the Navy

InventorsDavid R. Mott, Peter B. Howell, JR., Frances S. Ligler, Stephanie Fertig, Aron Bobrowski

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Abstract

A sheath flow system having a channel with at least one fluid transporting structure located in the top and bottom surfaces situated so as to transport the sheath fluid laterally across the channel to provide sheath fluid fully surrounding the core solution. At the point of introduction into the channel, the sheath fluid and core solutions flow side by side within the channel or the core solution may be bounded on either side by the sheath fluid. The system is functional over a broad channel size range and with liquids of high or low viscosity. The design can be readily incorporated into microfluidic chips without the need for special manufacturing protocols. Uses include extruding materials and/or fabricating structures.

Claims5

Dependent claims

A method for extruding materials, comprising:

providing a channel having a proximal end and a distal end, said channel having opposed facing top and bottom surfaces, said channel having at least one first fluid transporting structure across said channel located on said top surface and at least one second fluid transporting structure across said channel located on said bottom surface, said first and second fluid transporting structures being located between said proximal and said distal end and on said opposing faces surfaces, facing one another across the channel;
introducing a sheath stream and a core stream at said proximal end of said channel, said sheath and core streams flowing down said channel side by side towards said distal end, wherein said fluid transporting structures transport said sheath stream across said top and bottom surfaces of said channel to surround said core stream, wherein said sheath stream controls the size and shape of said core stream, wherein said core stream is extruded from said distal end of said channel.

Dependencies are inferred from the claim text.

Facts

Application: 14/725,769Filed 29 May 2015
Priority: 9 Jun 2005
Published: 24 Sep 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

B29C 48/21
The components being layers: the layers being joined at their surfaces
B01L 3/5027
With fluid transport, e.g. in multi-compartment structures: by integrated microfluidic structures, i.e. dimensions of channels and chambers are…
B01L 3/502776
Characterised by multiphase flow arrangements: specially adapted for focusing or laminating flows
B29C 48/2556
Flow control means, e.g. valves: provided in or in the proximity of dies

Family

Application60/690,057Us provisional application · filed 9 Jun 2005
Application11/423,225Division · filed 9 Jun 2006
Application12/987,251Division · filed 10 Jan 2011
Application14/725,769Division
US 2009/0208372 A1Published application
US 2012/0052521 A1Published application
US 8,361,413 B2Related patent
US 9,067,204 B2Related patent
US 9,649,803 B2Related patent
US 2015/0266226 A1This patent

From the US filing history. Foreign family members aren’t listed.