Method of locating the tip of a central venous catheter
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United States of America Patent
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Mar 5, 2013
Grant Date -
Oct 15, 2009
app pub date -
Apr 21, 2009
filing date -
Oct 23, 2006
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Methods of locating a tip of a central venous catheter (“CVC”) relative to the superior vena cava, sino-atrial node, right atrium, and/or right ventricle using electrocardiogram data. The CVC includes at least one electrode. In particular embodiments, the CVC includes two or three pairs of electrodes. Further, depending upon the embodiment implemented, one or more electrodes may be attached to the patient's skin. The voltage across the electrodes is used to generate a P wave. A reference deflection value is determined for the P wave detected when the tip is within the proximal superior vena cava. Then, the tip is advanced and a new deflection value determined. A ratio of the new and reference deflection values is used to determine a tip location. The ratio may be used to instruct a user to advance or withdraw the tip.
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