×

Blood hematocrit monitoring system

  • US 4,243,883 A
  • Filed: 01/19/1979
  • Issued: 01/06/1981
  • Est. Priority Date: 01/19/1979
  • Status: Expired due to Term
First Claim
Patent Images

1. A system for monitoring and controlling the level of blood hematocrit comprising:

  • an infra-red light source means;

    an infra-red sensitive photo-transistor detector means opposing said light source means, said detector means being selected so as to produce a change in voltage dependent upon the amount of light impinging thereupon and having a spectral sensitivity at the wavelength of the light source means;

    lumen means intermediate said light source means and said detector means, said lumen means being substantially optically transparent to the light emitted by said light source means; and

    meter means responsive to the voltage emitted from said detector means for indicating the quantity of hematocrit within a moving column of blood when said column is passed through said lumen means;

    a three-way valve means downstream of said detector means and said light source means, said valve means being coupled to said lumen means, a first outlet of said valve means and a second outlet from said valve means; and

    means within said meter means for causing blood to flow from said lumen means to said first outlet when the blood hematocrit level is above a preselected value and to flow from said lumen to said second outlet when the blood hematocrit level is below said preselected value.

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