Method and apparatus for detecting artifacts in a blood pressure measuring system
First Claim
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1. A method for detecting artificial artifacts in a blood pressure measuring system comprising the steps of:
- obtaining a time sequence of samples representative of the actual blood pressure of a being,calculating a short-term mean value based on preceding values of the blood pressure,comparing at least one of said samples of said time sequence with said mean value,repeating said step of comparing for a period of time,indicating an artificial artifact if substantially all of said comparisons reveal that the samples exceed said mean value, andinhibiting said indicating step if pulsations is detected.
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Abstract
A method for detecting artifacts in a blood pressure measuring system, in particular artifacts caused by sampling or flushing in an invasive blood pressure measuring system, disables the related alarms if a sample in a time sequence is larger than a mean value, and when it exceeds a predetermined limit, and when its slope is beyond another limit, and if all of these conditions apply for a certain time period. The end of an artifact is detected if the slope falls beyond a limit, a pulsation is detected, the absolute value is beyond a limit for a certain amount of time, or a long timeout occurs.
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Citations
19 Claims
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1. A method for detecting artificial artifacts in a blood pressure measuring system comprising the steps of:
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obtaining a time sequence of samples representative of the actual blood pressure of a being, calculating a short-term mean value based on preceding values of the blood pressure, comparing at least one of said samples of said time sequence with said mean value, repeating said step of comparing for a period of time, indicating an artificial artifact if substantially all of said comparisons reveal that the samples exceed said mean value, and inhibiting said indicating step if pulsations is detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A blood pressure measuring system, in particular an invasive blood pressure measuring system, comprising:
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blood pressure sensing means for receiving electronic signals representative of a being'"'"'s blood pressure from a blood pressure transducer; blood pressure calculating means for calculating the blood pressure, in particular the mean beat-to-beat blood pressure, from said electronic signals received from said blood pressure sensing means; alarm generating means set up to generate an alarm if said calculated blood pressure fulfills at least one predetermined alarm condition, in particular if it falls below or exceeds a predetermined limit; and artificial artifact detection means for comparing samples representative of said being'"'"'s actual blood pressure with a mean value based on preceding values of the blood pressure for repeating said comparison for a predetermined number of samples and for generating an artificial artifact indicating signal if substantially all of said comparisons reveal that the samples exceed said mean value or values unless pulsation is sensed by said blood pressure transducer;
wherein said artificial artifact indicating signal is fed to said alarm generating means causing the alarm generating means to suppress alarms as long as said artificial artifact indicating signal is in its active state.
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Specification