Automatic mean blood pressure reading device
First Claim
1. A method for automatically taking indirect mean blood pressure readings comprising the steps of:
- a. placing a cuff around a portion of a person'"'"'s body;
b. inflating the cuff to a predetermined pressure;
c. taking a measurement of the peak to peak oscillation values of the cuff pressure with each heartbeat and a substantially simultaneous measurement of the cuff pressure;
d. incrementally deflating the cuff at a predetermined increment of pressure, and maintaining said cuff pressure at a constant value for a predetermined period of time while taking a measurement of the peak-to-peak oscillation values of the cuff pressure with each heartbeat and a simultaneous measurement of the cuff pressure;
e. continuously comparing the measurement of the peak to peak oscillation values at each cuff pressure to determine the maximum peak to peak value and storing said cuff pressure measurement obtaining when said maximum peak to peak value measurement was determined;
f. repeating the steps (d) and (e) at least two more times after the maximum peak-to-peak value has been determined;
g. determining and storing the lowest cuff pressure at which the maximum peak to peak value measurement is obtained;
h. deflating the cuff if a measure of the peak-to-peak oscillation value is not obtained which is greater than or equal to the measurement value obtained at least two measurements before; and
i. indicating the values of pressures obtained in said method steps.
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Accused Products
Abstract
A method for producing information indicative of the mean blood pressure of a living creature through indirect measurement, practiced in a system comprising an inflatable cuff, a pump connected to the cuff, a deflating valve connected to the cuff, measuring apparatus connected to the cuff adapted to measure cuff pressure and pressure oscillations occurring in the cuff caused by the heartbeat of the living creature and control apparatus connected to the pressure measuring apparatus, pump and deflating valve. Deflation of the cuff occurs in pressure increments, with processing being done at each given increment to evaluate plural successive pulsations for purposes of artifact rejection and identification of a true pulsation.
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Citations
8 Claims
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1. A method for automatically taking indirect mean blood pressure readings comprising the steps of:
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a. placing a cuff around a portion of a person'"'"'s body; b. inflating the cuff to a predetermined pressure; c. taking a measurement of the peak to peak oscillation values of the cuff pressure with each heartbeat and a substantially simultaneous measurement of the cuff pressure; d. incrementally deflating the cuff at a predetermined increment of pressure, and maintaining said cuff pressure at a constant value for a predetermined period of time while taking a measurement of the peak-to-peak oscillation values of the cuff pressure with each heartbeat and a simultaneous measurement of the cuff pressure; e. continuously comparing the measurement of the peak to peak oscillation values at each cuff pressure to determine the maximum peak to peak value and storing said cuff pressure measurement obtaining when said maximum peak to peak value measurement was determined; f. repeating the steps (d) and (e) at least two more times after the maximum peak-to-peak value has been determined; g. determining and storing the lowest cuff pressure at which the maximum peak to peak value measurement is obtained; h. deflating the cuff if a measure of the peak-to-peak oscillation value is not obtained which is greater than or equal to the measurement value obtained at least two measurements before; and i. indicating the values of pressures obtained in said method steps. - View Dependent Claims (2, 3, 5, 6, 7, 8)
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4. A method for automatically taking indirect mean blood pressure readings comprising:
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a. placing a cuff connected to a transducer around a portion of a person'"'"'s body; b. automatically determining the transducer zero offset; c. inflating the cuff to a predetermined pressure while compensating for the initial transducer zero offset; d. taking a measurement of substantially peak to peak oscillation values of the cuff pressure having similar peak-to-peak values, duration between pulse peaks, and rise time characteristics; e. incrementally deflating the cuff a predetermined amount of pressure and maintaining said cuff at a constant pressure for a predetermined time period and taking measurements until substantially similar peak to peak oscillation value characteristics of the cuff pressure occur while measuring the cuff pressure; f. continuously comparing the measurement at each cuff pressure to determine the maximum peak to peak value; g. repeating steps (e) and (f) at least two more times beyond the maximum peak to peak value obtained; h. indicating the cuff pressure at which the maximum peak to peak value was obtained; i. deflating the cuff if a value is not obtained for said measurement of said peak-to-peak oscillation values which is greater than or equal to the peak to peak value measurement obtained at least two measurements before; and j. printing out the values obtained during the taking of said measurements.
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Specification