NIBP target inflation pressure automation using derived SPO 2 signals
First Claim
1. A method of monitoring blood pressure in a patient, the method comprising the steps of:
- providing a pulse monitor having a sensor operable to detect pulse signals due to the patient'"'"'s heartbeat;
positioning a blood pressure cuff on the patient;
positioning the sensor on the patient distal to the blood pressure cuff to detect pulse signals from the patient;
inflating the blood pressure cuff;
calculating, using a central processor, a second derivative of the pulse signals during inflation of the blood pressure cuff, the second derivative including a series of acceleration pulse peaks;
reducing low frequency variations in the pulse signals based on the calculated second derivative of the pulse signals; and
terminating the inflation of the blood pressure cuff based upon the acceleration pulse peaks in the calculated second derivative of the pulse signals; and
defining an initial target pressure after terminating the inflation of the blood pressure cuff.
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Accused Products
Abstract
A method and system for operating a non-invasive blood pressure monitor that utilizes an SpO2 plethysmograph waveform to determine the initial inflation pressure for the NIBP monitor. A pulse sensor is placed on the patient'"'"'s limb distal to the blood pressure cuff and provides a pulse waveform to the NIBP monitor. The NIBP monitor calculates a second derivative of the pulse waveform, which includes a series of acceleration peaks corresponding to pulse signals within the pulse waveform. When the blood pressure cuff reaches systolic pressure, the acceleration peaks contained within the acceleration waveform are eliminated, thus providing an indication that the cuff pressure has reached systolic pressure for the patient. Use of the SPO2 plethysmograph signal to determine the initial inflation pressure reduces both the over-inflation of the blood pressure cuff and the under-inflation of the blood pressure cuff, which increases the rate at which the blood pressure measurement can be made while increasing patient comfort.
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Citations
17 Claims
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1. A method of monitoring blood pressure in a patient, the method comprising the steps of:
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providing a pulse monitor having a sensor operable to detect pulse signals due to the patient'"'"'s heartbeat; positioning a blood pressure cuff on the patient; positioning the sensor on the patient distal to the blood pressure cuff to detect pulse signals from the patient; inflating the blood pressure cuff; calculating, using a central processor, a second derivative of the pulse signals during inflation of the blood pressure cuff, the second derivative including a series of acceleration pulse peaks; reducing low frequency variations in the pulse signals based on the calculated second derivative of the pulse signals; and terminating the inflation of the blood pressure cuff based upon the acceleration pulse peaks in the calculated second derivative of the pulse signals; and defining an initial target pressure after terminating the inflation of the blood pressure cuff. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating a non-invasive blood pressure (NIBP) monitor having a central processor, a blood pressure cuff positionable on an arm of the patient and a pressure transducer operable to detect oscillation pulses beneath the blood pressure cuff, the method comprising the steps of:
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providing a pulse monitor having a sensor positioned to detect a pulse waveform having a plurality of pulses from the patient representative of the patient'"'"'s heartbeat; positioning a blood pressure cuff on an arm of the patient; positioning the sensor of the pulse monitor on the same arm of the patient and anatomically distal to the blood pressure cuff; inflating the blood pressure cuff to begin to occlude an artery in the arm of the patient; calculating, using the central processor, a second derivative of the pulse waveform during inflation of the blood pressure cuff, the second derivative including a series of acceleration pulse peaks; reducing low frequency variations in the pulse waveform based on the calculated second derivative of the pulse waveform; and terminating the inflation of the blood pressure cuff based upon the acceleration pulse peaks in the calculated second derivative of the pulse waveform; and defining an initial target pressure after terminating the inflation of the blood pressure cuff; decreasing the pressure in the blood pressure cuff from the initial inflation pressure while monitoring for oscillation pulses from the pressure transducer; and calculating the systolic pressure, mean arterial pressure and diastolic pressure for the patient based upon the cuff oscillation pulses detected during the deflation of the blood pressure cuff. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system for determining the blood pressure of a patient, comprising:
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a non-invasive blood pressure (NIBP) monitor including a central processor and a display; a blood pressure cuff positionable on the patient, the blood pressure cuff being selectively inflatable and deflatable by the NIBP monitor; a pressure transducer operable to measure the pressure within the blood pressure cuff and coupled to the central processor, the pressure transducer being operable to detect oscillation pulses from the patient; and a pulse monitoring system having a sensor positionable on the patient to detect pulse signals from the patient due to the patient'"'"'s heartbeat, wherein the central processor calculates a second derivative of the pulse signals; reduces low frequency variation in the pulse signals; and controls the inflation of the blood pressure cuff based upon the calculated second derivative. - View Dependent Claims (16, 17)
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Specification