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Flow-cell device

  • US 5,007,732 A
  • Filed: 04/18/1988
  • Issued: 04/16/1991
  • Est. Priority Date: 04/20/1987
  • Status: Expired due to Term
First Claim
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1. A sheath flow type flow-cell device for a flow-cytometer comprising:

  • a first inlet for sheath fluid,a flow passage communicating with said first inlet and contracted toward downstream, said flow passage having a substantially rectangular cross section,a straight capillary flow passage connected to said flow passage downstream thereof, said capillary flow passage having a substantially rectangular cross section,a second inlet for sample fluid,a nozzle communicating with said second inlet and opened within said flow passage in the same direction as the flow direction of said straight capillary flow passage,a discharge port provided at a terminal end of said straight capillary flow passage, andflow regulating means for regulating the flow of said sheath fluid in said straight capillary flow passage to be a laminar flow having a gradient of flow velocity, wherein said straight capillary flow passage has opposing first and second side walls connected by top and bottom walls and wherein said flow regulating means comprises said second said wall having a rougher surface than a surface of said first said wall.

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