×

Apparatus for pumping and directing fluids for hematology testing

  • US 5,380,491 A
  • Filed: 01/21/1993
  • Issued: 01/10/1995
  • Est. Priority Date: 01/21/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. An apparatus for hematology testing, comprising:

  • a sensing unit defining a counting orifice for the flow of a blood sample through the sensing unit to analyze the blood sample, the counting orifice defining an inlet side and an outlet side, and the sensing unit including a first inlet port and a second inlet port, the first and second inlet ports each being fluidly coupled to and located on the inlet side of the counting orifice; and

    means for pumping including at least two syringes, a first syringe being coupled by a sample line to the first inlet port of the sensing unit and injecting a blood sample from the inlet side through the counting orifice, and a second syringe being located upstream of the second inlet port of the sensing unit and coupled by a sheath line to the second inlet port and simultaneously injecting a sheath of fluid through the sheath line and second inlet port and surrounding the sample stream on the inlet side of the counting orifice.

View all claims
  • 9 Assignments
Timeline View
Assignment View
    ×
    ×