DETERMINATION OF BLOOD PUMP SYSTEM PERFORMANCE AND SAMPLE DILUTION USING A PROPERTY OF FLUID BEING TRANSPORTED
First Claim
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1. A method of measuring an analyte in a patient, comprising:
- (a) removing a sample of blood from the patient; and
(b) measuring the analyte in the sample.
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Abstract
The present invention provides methods and apparatuses related to measurement of analytes, including measurements of analytes in samples withdrawn from a patient.
105 Citations
21 Claims
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1. A method of measuring an analyte in a patient, comprising:
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(a) removing a sample of blood from the patient; and (b) measuring the analyte in the sample. - View Dependent Claims (2, 3, 5, 6, 7, 9, 10, 15)
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4. A method of withdrawing a blood sample from a withdrawal catheter port, wherein an infusate is infused through an infusion catheter port, comprising:
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(a) determining patient conditions related to blood flow or pressure that are likely to lead to contamination of the withdrawn blood sample with the infusate, wherein the withdrawal port is distal from the heart relative to the infusion port; (b) withdrawing a sample from the withdrawal port under withdrawal conditions determined in part from the patient conditions.
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8. A method of determining the presence of a bubble in a blood access system comprising at least one pressure detector, comprising:
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(a) Using the pressure detector to determine a first frequency response of the system at a first time; (b) Using the pressure detector to determine a second frequency response of the system at a second time; (c) Determining if a bubble is present in the system by comparing the first and second frequency responses.
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- 11. An apparatus that measures an analyte in a patient, comprising a subsystem configured to remove a sample of blood or other fluid from the patient, and a subsystem configured to measure the analyte in the sample.
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21. An indwelling fiber optic probe, comprising at least one optical fiber having a proximal end and a distal end, wherein illumination light from a near-infrared light source is coupled into the proximal end and directed to the distal end of the fiber and wherein the distal end is inserted into a patient tissue and wherein light from the tissue is collected by the distal end of the at least one optical fiber and returned to the proximal end of the fiber as collected light.
Specification