Method and apparatus for excluding artifacts from automatic blood pressure measurements
First Claim
1. A blood pressure monitor, comprising:
- a blood pressure cuff;
an air pressure pump pneumatically coupled to the blood pressure cuff;
a valve pneumatically coupled to the blood pressure cuff;
a pressure transducer pneumatically coupled to the blood pressure cuff, the pressure transducer generating a signal indicative of air pressure in the blood pressure cuff and a signal corresponding to the oscillometric pulses in the blood pressure cuff;
processor means connected to the pressure transducer and receiving the signal indicative of the air pressure in the blood pressure cuff and the signal corresponding to oscillometric pulses in the blood pressure cuff, the processor means connected to the air pressure pump and the valve, the processor means comprising means for energizing the air pump to inflate the blood pressure cuff, energizing the valve to reduce the air pressure in the blood pressure cuff, detecting an occurrence of an oscillometric pulse, determining an amplitude and rise time of the oscillometric pulse, determining whether the amplitude and rise time are within amplitude and rise time screening limits, disregarding the pulse when the amplitude and rise time are not within the screening limits, determining whether the screened pulse matches another screened pulse detected at the same cuff air pressure level based on the amplitude and rise time of the pulses, saving pulse data when pulses match, and determining systolic and diastolic pressures based on the saved pulse data.
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Abstract
A method and system for detecting blood pressure pulses and screening out artifact-induced pulses when an automatic blood pressure monitor is provided. In preferred embodiments, the system detects the occurrence of an oscillometric pulse, determines the amplitude and rise time of the pulse, determines whether the amplitude and rise-times are within patient-specific screening limits and disregards pulses not within the limits, determines whether a pulse matches other pulses and saves the matching pulse data, determines the diastolic and systolic pressure based on the saved matched pulse data, and updates the patient-specific screening limits. In a preferred embodiment, pulses match based on similar amplitude and rise time characteristics. The amplitude and rise time screening limits are updated based on average values of prior blood pressure measurements for the patient.
41 Citations
15 Claims
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1. A blood pressure monitor, comprising:
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a blood pressure cuff; an air pressure pump pneumatically coupled to the blood pressure cuff; a valve pneumatically coupled to the blood pressure cuff; a pressure transducer pneumatically coupled to the blood pressure cuff, the pressure transducer generating a signal indicative of air pressure in the blood pressure cuff and a signal corresponding to the oscillometric pulses in the blood pressure cuff; processor means connected to the pressure transducer and receiving the signal indicative of the air pressure in the blood pressure cuff and the signal corresponding to oscillometric pulses in the blood pressure cuff, the processor means connected to the air pressure pump and the valve, the processor means comprising means for energizing the air pump to inflate the blood pressure cuff, energizing the valve to reduce the air pressure in the blood pressure cuff, detecting an occurrence of an oscillometric pulse, determining an amplitude and rise time of the oscillometric pulse, determining whether the amplitude and rise time are within amplitude and rise time screening limits, disregarding the pulse when the amplitude and rise time are not within the screening limits, determining whether the screened pulse matches another screened pulse detected at the same cuff air pressure level based on the amplitude and rise time of the pulses, saving pulse data when pulses match, and determining systolic and diastolic pressures based on the saved pulse data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A blood pressure monitor, comprising:
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a blood pressure cuff; an air pressure pump pneumatically coupled to the blood pressure cuff; a valve pneumatically coupled to the blood pressure cuff; a pressure transducer pneumatically coupled to the blood pressure cuff, the pressure transducer generating a signal indicative of air pressure in the blood pressure cuff and a signal corresponding to the oscillometric pulses in the blood pressure cuff; processor means connected to the pressure transducer and receiving the signal indicative of the air pressure in the blood pressure cuff and the signal corresponding to oscillometric pulses in the blood pressure cuff, the processor means connected to the air pressure pump and the valve, the processor means comprising means for energizing the air pump to inflate the blood pressure cuff, energizing the valve to reduce the air pressure in the blood pressure cuff, detecting an occurrence of an oscillometric pulse, determining an amplitude and rise time of the detected pulse, determining whether the detected pulse matches another pulse detected at the same cuff air pressure level based on the amplitude and rise time, and when pulses match saving pulse data, and determining systolic and diastolic pressures based on the saved pulse data. - View Dependent Claims (14)
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15. A system for calculating blood pressure from a plurality of oscillometric pulses detected at a plurality of pressures, comprising:
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first means for determining whether the amplitude and rise time of each oscillometric pulse matches the amplitude and rise time of another oscillometric pulse detected at the same pressure; second means for saving pulse data corresponding to the matched amplitude and rise time of the oscillometric pulses; and third means for calculating blood pressure parameters based on the saved pulse data.
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Specification