Patent ID: 9440047
Filing Date: 2016-09-13
CPC Classification: A61B,A61M

Claim Text:
1. A method for placing a peripherally inserted catheter tip using an ECG search window, the method comprising: acquiring a plurality of surface ECG signals from at least one surface ECG electrode; generating a signal averaged surface ECG signal from the plurality of surface ECG signals; determining a first fiducial point by identifying an extremum of a R wave; establishing a first ECG search window between first and second predetermined values offset from the first fiducial point; determining a second fiducial point by identifying an extremum in the first ECG search window; determining a search window beginning value by identifying a local extremum on a first side of the second fiducial point, and determining a search window ending value by identifying a local extremum on a second side of the second fiducial point; establishing a second ECG search window between the search window beginning value and the search window ending value so that the second ECG search window is narrower than the first ECG search window; and applying the second ECG search window to an intravascular ECG signal acquired from an intravascular ECG electrode coaxially surrounded by the peripherally inserted catheter tip.