초록 ▼

A system for continuously monitoring and/or controlling blood hematocrit levels is disclosed. The system includes a photometric hematocrit sensor which is coupled to a linear response meter, and in one embodiment a separate sensor is coupled to a three-way solenoid valve. The sensor is responsive to

A system for continuously monitoring and/or controlling blood hematocrit levels is disclosed. The system includes a photometric hematocrit sensor which is coupled to a linear response meter, and in one embodiment a separate sensor is coupled to a three-way solenoid valve. The sensor is responsive to the hemoglobin density in the optical path. The valve system automatically causes diversion of solution having a degree of hematocrit dilution below a set minimum. The sensor is independent of the amount of oxy-hemoglobin (HbO2) and reduced hemoglobin (HHb) and the system allows for instantaneous detection of improper hematocrit levels and obviates the need for time-consuming and unreliable centrifugal micro-hematocrit tests.

대표청구항 ▼

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 amoun

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.