Beat onset detector
First Claim
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1. A method for identifying an onset of a first heart beat, the method comprising:
- sensing blood pressure over time to produce a plurality of blood pressure samples;
identifying a post onset point in time following an onset of the first heart beat and preceding an onset of a second heart beat; and
identifying the onset of the first heart beat based upon the blood pressure samples and the post onset point.
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Abstract
A method for identifying an onset of a first heart beat includes sensing blood pressure over time to produce a plurality of blood pressure samples, each sample having a corresponding blood pressure amplitude in time, identifying a post onset point in time following an onset of the first heart beat and preceding an onset of a second heart beat, and identifying an onset of the heart beat based upon the blood pressure samples and the post onset point.
83 Citations
15 Claims
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1. A method for identifying an onset of a first heart beat, the method comprising:
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sensing blood pressure over time to produce a plurality of blood pressure samples; identifying a post onset point in time following an onset of the first heart beat and preceding an onset of a second heart beat; and identifying the onset of the first heart beat based upon the blood pressure samples and the post onset point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for identifying an onset of a heart beat, the method comprising:
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sensing blood pressure over time to produce a plurality of blood pressure samples, each sample representing a blood pressure amplitude at a corresponding time; selecting at least one candidate blood pressure sample as a potential onset of the heart beat; for each candidate sample, generating a threshold rate of blood pressure change between the candidate sample and a blood pressure amplitude at a preceding identified onset of a preceding heart beat; generating a local rate of blood pressure change between the candidate sample and a preceding preselected sample; and comparing the threshold rate and the local rate to determine whether the candidate sample constitutes the onset of the heart beat.
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14. A method for identifying an onset of a first heart beat, the method comprising:
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sensing blood pressure over time to produce a plurality of blood pressure samples; identifying a post onset point in time following an onset of the first heart beat and preceding an onset of a second heart beat, wherein the step of identifying a post onset point in time includes; generating a plurality of gain values, each gain value representing a pressure amplitude change during a corresponding preselected time period; and comparing the plurality of gain values to identify a maximum gain value, wherein the maximum gain value corresponds to the post onset point; and identifying the onset of the first heart beat based upon blood pressure samples sensed before the post onset point by; (a) selecting a candidate blood pressure sample preceding the post onset point as a potential onset of the heart beat; (b) generating a threshold rate of blood pressure change between the candidate sample and a blood pressure amplitude at a preceding identified onset of a preceding heart beat; (c) generating a local rate of blood pressure change between the candidate sample and a preceding preselected sample; and (d) comparing a threshold rate and the local rate to determine whether the candidate sample constitutes the onset of the heart beat. - View Dependent Claims (15)
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Specification