Single light sensor optical probe for monitoring blood parameters and cardiovascular measurements
First Claim
1. An apparatus for measuring blood parameters in a blood system, comprising:
- (a) an extracorporeal portion having a first end adapted to be connected to a vascular portion of the blood system at an up stream end and a second end adapted to be connected to the vascular portion at a downstream end, the extracorporeal portion having a light transmissive section;
(b) an optical sensor coupled to the light transmissive section for detecting a photometric property of diluted blood flowing within the extracorporeal portion; and
(c) means for determining a selected blood characteristics corresponding to the detected photometric property of the diluted blood.
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Accused Products
Abstract
A method and device for the continuous real-time monitoring of relative blood volume change, based on registration of blood hemoglobin concentration, during long periods of time, such as dialysis session. A method and device for cardiac output measurement, based on optical dilution technique, during dialysis, surgeries, intensive care procedure. The effects of blood electrolyte composition change which result in a change of light beam geometry are eliminated by the relative orientation between a light source and a single light or photodetector. An illumination axis and a detection axis are oriented in an offset, non colinear configuration at a sufficient angle to substantially eliminate the scattering properties of the blood. A primary implementation of the device is extracorporeal paths, such as hemodialysis tubing systems, artery-vein extracorporeal artificial shunts, other extracorporeal systems. It also may be applied to vessels, tissues or to body parts being capable of transillumination.
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Citations
15 Claims
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1. An apparatus for measuring blood parameters in a blood system, comprising:
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(a) an extracorporeal portion having a first end adapted to be connected to a vascular portion of the blood system at an up stream end and a second end adapted to be connected to the vascular portion at a downstream end, the extracorporeal portion having a light transmissive section; (b) an optical sensor coupled to the light transmissive section for detecting a photometric property of diluted blood flowing within the extracorporeal portion; and (c) means for determining a selected blood characteristics corresponding to the detected photometric property of the diluted blood. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for measuring blood parameters in a blood system having a vascular portion, the method comprising:
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(a) connecting an extracorporeal portion to the vascular portion at an upstream end and connecting the extracorporeal portion to the vascular portion at a downstream end, the extracorporeal portion including a light transmissive section; (b) introducing an indicator bolus upstream of an optical sensor in the extracorporeal portion; (c) determining a photometric property of diluted blood in the extracorporeal portion; and (d) determining a blood characteristic corresponding to the diluted photometric property of the blood. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification