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Method and apparatus for determining hematocrit

  • US 4,068,169 A
  • Filed: 09/21/1976
  • Issued: 01/10/1978
  • Est. Priority Date: 09/21/1976
  • Status: Expired due to Term
First Claim
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1. Apparatus for measuring hematocrit comprising:

  • peak detection means for connection to a sensor providing sensor pulses in response to blood cells in a sample, the sensor pulses each having a peak amplitude respectively corresponding to the size of a cell in response to which the sensor pulse is produced;

    storage means connected to said peak detecting means for generating and storing a signal having a level indicative of the peak value sensed by said peak detecting means for each pulse;

    accumulation means;

    controlled switching means coupling said storage means to said accumulation means, timing means responsive to said sensor pulses for initiating a first time period in response to each sensor pulse in excess of a threshold level and providing an output for enabling said storage means to respond to the sensor pulse, said timing means further including means for establishing a second time period in response to the completion of each first time period and providing an output for closing said controlled switching means for a fixed time period during said second time period, whereby said accumulation means is incremented by an amount in correspondence with the level of the stored signal in said storage means.

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