SYSTEMS AND METHODS TO REDUCE FLUID CONTAMINATION
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Abstract
Methods and systems for determining the concentration of one or more analytes from a sample such as blood or plasma are described. The systems described herein can be configured to withdraw a certain volume of sample from a source of bodily fluid, direct a first portion of the withdrawn sample to an analyte monitoring system and return a second portion of the sample to the patient. The analyte monitoring system can include an automated blood withdrawal system that is configured to withdraw blood from the patient'"'"'s vasculature at low pressure and/or withdrawal rates so as to reduce or prevent contamination of the withdrawn fluid from the infusion fluids.
30 Citations
26 Claims
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1-16. -16. (canceled)
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17. A method for automatically drawing high quality blood samples to improve periodic blood analysis and reduce contamination risk, the method comprising:
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providing a tube configured to connect to a multi-lumen catheter without leaking, the multi-lumen catheter having an upstream port and a downstream port, each port having an independent lumen not in fluid communication with the other; positioning the multi-lumen catheter in a patient'"'"'s vessel such that the lumen of the upstream port opens into the vessel upstream of the lumen of the downstream port; providing an automated fluid pressure system configured to automatically maintain a low pressure and/or flow rate while drawing blood; connecting the automated fluid pressure system to the tube such that the system is in fluid communication with the upstream port and blood flow in the patient'"'"'s vessel; and using the automated fluid pressure system to periodically draw blood in through the lumen of the upstream port while maintaining a low pressure and/or flow rate, thereby avoiding a reversal of blood flow in the patient'"'"'s vessel and reducing the risk of contamination of a blood sample. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification