Non-invasive determination of left-ventricular pressure
OwnerKevin M. McIntyreinventor
Life of this patent
Estimating the term…
Abstract
A left-ventricular pressure waveform is obtained non-invasively by obtaining pressure waveforms from first and second pressure measurements and selecting a segment from each of the first and second pressure waveforms. Each segment is associated with a different interval of a cardiac cycle. The segments are then time-shifted by an amount indicative of a relative time of occurrence of each of the first and second segments.
Claims27
A method for non-invasively constructing a left-ventricular pressure waveform, the method comprising:
- obtaining a first pressure waveform from a first non-invasive pressure measurement;
- obtaining a second pressure waveform from a second non-invasive pressure measurement;
- selecting a first segment from said first pressure waveform, said first segment being associated with a first interval of a cardiac cycle;
- selecting a second segment from said second waveform, said second segment being associated with a second interval of said cardiac cycle;
- and
- time-shifting said first and second segments relative to each other by an amount indicative of a relative time of occurrence of each of said first and second segments.
A system for non-invasively constructing a left-ventricular pressure waveform, said system comprising:
- a first amplitude sensor for non-invasively obtaining a first pressure waveform;
- a second amplitude sensor for non-invasively obtaining a second pressure waveform;
- an event sensor for detecting a time of occurrence of an event in a cardiac cycle;
- and
- a processor in communication with said first and second amplitude sensors and with said event sensor, said processor being configured to select a segment from each of said first and second waveforms and to connect said segments on the basis of said time of occurrence of said event.
A method of non-invasively obtaining a left-ventricular pressure waveform, said method comprising:
- selecting, from a first signal, a first signal portion that corresponds to a first phase of a cardiac cycle;
- selecting, from a second signal, a second signal portion that corresponds to a second phase of said cardiac cycle;
- determining a temporal relationship between said first and second signal portions;
- and
- time-shifting said first and second signal portions consistent with said temporal relationship.
A system for non-invasively generating a ventricular pressure waveform, said system comprising:
- a non-invasive barograph for obtaining first data and second data indicative of first and second pressures within a ventricle, said first and second pressures being temporally separated from each other;
- a non-invasive event detector for obtaining third data indicative of an occurrence of an event in the cardiac cycle;
- and
- a data processor configured to receive said first, second and third data and to combine said first and second data on the basis of said third data to construct therefrom, a ventricular pressure waveform.
Dependencies are inferred from the claim text.