Catheter Tip Positioning Method
First Claim
1. A computer-based method for positioning an endovascular device in or near the heart using electrocardiogram (ECG) signals, comprising:
- receiving an endovascular ECG signal, associated with an endovascular device, including a plurality of waveforms, each waveform having at least a P-wave component;
processing the endovascular ECG signal, over a plurality of predetermined time periods, to calculate a P-wave amplitude and a spectral power for each predetermined time period;
determining a maximum P-wave amplitude from the plurality of P-wave amplitudes, and an associated maximum spectral power from the plurality of spectral powers;
associating the maximum P-wave amplitude and the maximum spectral power with a predetermined location in or near the heart;
calculating a location of the endovascular device, for each predetermined time period, based on a ratio of the P-wave amplitude to the maximum P-wave amplitude and a ratio of the spectral power to the maximum spectral power; and
displaying the location of the endovascular device to a user.
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Accused Products
Abstract
A computer-based method for positioning an endovascular device in or near the heart using electrocardiogram (ECG) signals is provided. The computer-based method includes receiving an endovascular ECG signal, associated with an endovascular device, including a plurality of waveforms, each waveform having at least a P-wave component, processing the endovascular ECG signal, over a plurality of predetermined time periods, to calculate a P-wave amplitude and a spectral power for each predetermined time period, determining a maximum P-wave amplitude from the plurality of P-wave amplitudes, and an associated maximum spectral power from the plurality of spectral powers, associating the maximum P-wave amplitude and the maximum spectral power with a predetermined location in or near the heart, calculating a location of the endovascular device, for each predetermined time period, based on a ratio of the P-wave amplitude to the maximum P-wave amplitude and a ratio of the spectral power to the maximum spectral power, and displaying the location of the endovascular device to a user.
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Citations
20 Claims
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1. A computer-based method for positioning an endovascular device in or near the heart using electrocardiogram (ECG) signals, comprising:
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receiving an endovascular ECG signal, associated with an endovascular device, including a plurality of waveforms, each waveform having at least a P-wave component; processing the endovascular ECG signal, over a plurality of predetermined time periods, to calculate a P-wave amplitude and a spectral power for each predetermined time period; determining a maximum P-wave amplitude from the plurality of P-wave amplitudes, and an associated maximum spectral power from the plurality of spectral powers; associating the maximum P-wave amplitude and the maximum spectral power with a predetermined location in or near the heart; calculating a location of the endovascular device, for each predetermined time period, based on a ratio of the P-wave amplitude to the maximum P-wave amplitude and a ratio of the spectral power to the maximum spectral power; and displaying the location of the endovascular device to a user. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A graphical user interface for a catheter positioning and navigation system, implemented as a computer-based method, comprising:
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a first electrocardiogram (ECG) waveform area to display at least one real-time ECG waveform; a second ECG waveform area to display at least one stored ECG waveform; a catheter tip location area to display the location of the catheter tip within the vasculature; a catheter tip location identification area to display quantitative characteristics of the ECG waveforms associated with different locations of the catheter tip location in the vasculature; a control area including a plurality of control elements to enable a user to access a plurality of related functions either directly or remotely; and means for automatically optimizing the display based on a plurality of parameters.
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19. An adaptor for endovascular electrocardiography, comprising:
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a member having two ends and an inner lumen such that when one of the ends is connected to a catheter and the other end is connected to a syringe, fluid from the syringe is flushed into the catheter through the inner lumen; and a metal insert, disposed along the inner lumen of the member, which connects through a sealed electrical connection to the outer side of the member.
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20. A method for guidance and navigation of an endovascular access device, comprising:
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placing one, two or three skin electrodes on a patient; introducing an endovascular access device, coupled to an electrode thorough a conductive path passing through the endovascular access device, into the patient; and determining a location of the tip of the endovascular access device based on electrical signals received from the skin electrodes and the endovascular electrode, wherein, if one skin electrode is placed on the patient, the skin electrode is placed on the lower left abdomen, wherein, if two skin electrodes are placed on the patient, the first skin electrode is placed on the lower left abdomen, and the second skin electrode is placed on the left shoulder, and wherein, if three skin electrodes are placed on the patient, the first skin electrode is placed on the lower left abdomen, the second skin electrode is placed on the left shoulder and the third skin electrode is placed on the lower right abdomen.
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Specification