Method and apparatus for detection of venous pulsation
AssigneeNellcor Puritan Bennett LLC
InventorClark R. Baker
Life of this patent
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Abstract
Methods and systems for detecting venous pulsation are provided. In one embodiment, a metric of the pulse shape of one or more plethysmographic signals is derived and the presence of venous pulsation is detected based on the metric of pulse shape. Examples, of metrics of pulse shape include a skew metric and a ratio of a minima-to-maxima time over a pulse period interval. In an exemplary embodiment, the presence of venous pulsation is detected based on a metric of the pulse shape of one or more plethysmographic signals and on a phase comparison of the plethysmographic signals.
Claims41
A method for detecting venous pulsation, comprising:
- deriving a skew metric for one or more plethysmographic signals;
- and
- detecting the presence of venous pulsation based on the skew metric.
A method for detecting venous pulsation, comprising:
- deriving a ratio of a minima-to-maxima time over an entire pulse period time of one or more plethysmographic signals;
- and
- detecting the presence of venous pulsation based on the ratio.
A method for detecting venous pulsation, comprising:
- deriving a metric of the pulse shape of one or more plethysmographic signals;
- deriving a phase comparison of the plethysmographic signals;
- and
- detecting the presence of venous pulsation based on the metric of the pulse shape and the phase comparison.
One or more tangible, machine readable media, comprising code executable to perform the acts of:
- deriving a skew metric for one or more plethysmographic signals;
- and
- detecting the presence of venous pulsation based on the skew metric.
One or more tangible, machine readable media, comprising code executable to perform the acts of:
- deriving a ratio of a minima-to-maxima time over an entire pulse period time of one or more plethysmographic signals;
- and
- detecting the presence of venous pulsation based on the ratio.
One or more tangible, machine readable media, comprising code executable to perform the acts of:
- deriving a metric of the pulse shape of one or more plethysmographic signals;
- deriving a phase comparison of the plethysmographic signals;
- and
- detecting the presence of venous pulsation based on the metric of the pulse shape and the phase comparison.
A patient monitoring system comprising:
- a patient monitor configured to:
- derive a skew metric for one or more plethysmographic signals;
- and
- detect the presence of venous pulsation based on the skew metric.
A patient monitoring system comprising:
- a patient monitor configured to:
- derive a metric of the pulse shape of one or more plethysmographic signals;
- derive a phase comparison of the plethysmographic signals;
- and
- detect the presence of venous pulsation based on the metric of the pulse shape and the phase comparison.
The system of claim 39, wherein detecting the presence of venous pulsation comprises comparing the venous pulsation metric to a threshold value.
A patient monitoring system comprising:
- a patient monitor configured to:
- derive a ratio of a minima-to-maxima time over an entire pulse period time of one or more plethysmographic signals;
- and
- detect the presence of venous pulsation based on the ratio.
Dependencies are inferred from the claim text.