Disposable extracorporeal conduit for blood constituent monitoring
First Claim
1. A disposable fluid cuvette, defining a fluid passageway for containing and conducting therethrough a fluid flowing under pressure in a pulsatile fashion, comprising:
- a. an inlet;
b. an outlet;
c. a conduit, in fluid communication both between and with said inlet and outlet and being comprised of materials which permit transmission of at least two predetermined wavelengths of electromagnetic radiation therethrough, comprising;
i. first and second opposed walls, having a predetermined separation therebetween, and constraining the pulsatile flowing fluid therebetween; and
ii. a transducer means, located in said first wall of said conduit, for varying said predetermined separation responsive to pressure pulsations in the fluid.
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Accused Products
Abstract
A disposable cuvette through which to pass pulsatile flowing blood. The cuvette has a conduit with two opposed walls having a predetermined separation therebetween that varies with each pulse of the flowing blood. A sealed air pocket damps the variation of the predetermined separation. The conduit is comprised of materials which permit passage therethrough of wavelengths of selected electromagnetic radiation. The radiation is emitted from a photoemitter which, and after passing through the cuvette, is detected by a photodetector. The quantities of detected radiation are operated on by a computer which uses a spectrophotometry technique to derive therefrom a blood constituent concentration value. Preferably, both cuvette and spectrophotometry technique are used during hemodialysis to derive changes in the hematocrit value of the blood of a dialyzed patient, thereby to deduce therefrom changes in the blood volume of the patient during dialysis. The technique enables a clinician to monitor a desired biologic constituent concentration value, such as the hematocrit, oxygen saturation, or oxygen content values by deriving and displaying the same as digital values in real time.
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Citations
53 Claims
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1. A disposable fluid cuvette, defining a fluid passageway for containing and conducting therethrough a fluid flowing under pressure in a pulsatile fashion, comprising:
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a. an inlet; b. an outlet; c. a conduit, in fluid communication both between and with said inlet and outlet and being comprised of materials which permit transmission of at least two predetermined wavelengths of electromagnetic radiation therethrough, comprising; i. first and second opposed walls, having a predetermined separation therebetween, and constraining the pulsatile flowing fluid therebetween; and ii. a transducer means, located in said first wall of said conduit, for varying said predetermined separation responsive to pressure pulsations in the fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A disposable blood cuvette, defining a fluid passageway for containing and conducting therethrough blood flowing under pressure in a pulsatile fashion, comprising:
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a. an inlet; b. an outlet; c. a conduit, having an essentially cylindrical shape and being in fluid communication both between and with said inlet and outlet and being comprised of materials which permit transmission of at least two predetermined wavelengths of electromagnetic radiation therethrough, comprising; i. opposed first and second walls, having a predetermined separation therebetween, and constraining the pulsatile flowing blood therebetween, and wherein for each pulse of said pulsatile flowing blood said first wall makes a resilient fluctuation so as to vary said predetermined separation and said second wall is essentially immobile; and ii. a vertical wall, situated both outside and in between said first and second walls, said blood flowing in a pulsatile fashion in contact with both said vertical wall and said first and second walls. - View Dependent Claims (31, 32, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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33. The cuvette as defined in 32, wherein said conduit means further comprises first, second and third cylindrical members in contact one with the others;
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a. said first member being essentially comprised of silicone and comprising said first wall; b. said second member being essentially comprised of medical grade plastic and comprising said second and vertical walls; c. said third member being essentially comprised of medical grade plastic and comprising said third wall.
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43. A disposable fluid cuvette, for defining a fluid passageway for containing and conducting therethrough a fluid flowing in a pulsatile fashion, comprising:
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a. a first fluid conduit, having an inlet and an outlet and a lumen therebetween; b. a second fluid conduit, comprised at least in part of materials essentially permitting transmission of at least two predetermined wavelengths of electromagnetic radiation therethrough, and comprising; i. an inlet in fluid communication with the outlet of the first fluid conduit; ii. means, in contact with said pulsatile flowing fluid, for making a resilient fluctuation with each pulse of said pulsatile flowing fluid in a direction essentially normal to the general direction of movement of the pulsatile flowing fluid; and iii. an outlet; c. a third fluid conduit, having an inlet and an outlet and a lumen therebetween, said inlet of said third fluid conduit being in fluid communication with the outlet of the second fluid conduit. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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Specification