METHOD AND APPARATUS FOR PERFORMING OPTICAL MEASUREMENTS OF A MATERIAL
First Claim
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1. An apparatus for determining an optical parameter or function thereof for blood ex vivo, the apparatus comprising:
- (a) a first conduit through which blood flows from a patient'"'"'s vascular system into a flow cell ex vivo, the flow cell having a cross-section dimension greater than an absorption length in the blood for light which the optical parameter or function thereof is determined;
(b) a pump which circulates the patient'"'"'s blood through the flow cell;
(c) a light source that transmits a pulse of light in the blood in the flow cell along the cross section dimension;
(d) a detector that receives energy emitted by the material responsive to light from the light pulse that is absorbed by the material and generates a signal responsive to the received energy;
(e) a processor that receives that signal and uses it to determine the optical parameter or function thereof; and
(f) a second conduit through which blood from the ex vivo flow cell recirculates into the patient'"'"'s vascular system.
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Abstract
A method of determining an optical parameter or function thereof for a liquid, the method comprising: flowing the liquid through a flow cell; transmitting a pulse of light into the liquid in the flow cell; generating a signal responsive to energy that the material emits responsive to a portion of the light from the light pulse that is absorbed by the liquid; and using the signal to determine the optical parameter or function thereof.
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Citations
1 Claim
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1. An apparatus for determining an optical parameter or function thereof for blood ex vivo, the apparatus comprising:
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(a) a first conduit through which blood flows from a patient'"'"'s vascular system into a flow cell ex vivo, the flow cell having a cross-section dimension greater than an absorption length in the blood for light which the optical parameter or function thereof is determined; (b) a pump which circulates the patient'"'"'s blood through the flow cell; (c) a light source that transmits a pulse of light in the blood in the flow cell along the cross section dimension; (d) a detector that receives energy emitted by the material responsive to light from the light pulse that is absorbed by the material and generates a signal responsive to the received energy; (e) a processor that receives that signal and uses it to determine the optical parameter or function thereof; and (f) a second conduit through which blood from the ex vivo flow cell recirculates into the patient'"'"'s vascular system.
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Specification