Sheath flow apparatus for laminar flow systems

A sheath flow device comprising:

• a channel, having a proximal end and a distal end, said channel having at top surface and a bottom surface;
• at least one first input in direct connection with said channel for introducing a sheath stream at said proximal end;
• at least one second input in direct connection with said channel for introducing a core stream at said proximal end;
• at least one first fluid transporting structure across said channel located on said top surface;
• 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 opposing surfaces facing one another across the channel,
• wherein said first and said second fluid transporting structures are configured to transport said sheath stream across said channel to surround said core stream thereby creating sheath flow;
• and
• an output at said distal end of said channel.