METHOD OF CONTROLLING INFLATION OF A CUFF IN BLOOD PRESSURE DETERMINATION
First Claim
1. A method of calculating an initial inflation pressure, while monitoring blood pressure, comprising the steps of:
- (a) inflating a blood pressure cuff;
(b) monitoring for the presence of oscillometric pulses during the inflation of the blood pressure cuff;
(c) estimating a quick systolic blood pressure for a patient based on the oscillometric pulses detected during the inflation of the blood pressure cuff; and
(d) defining the initial inflation pressure as a predetermined pressure above the estimated systolic pressure;
wherein the systolic blood pressure is estimated by curve fitting with a pre-defined function having a physiologically-expected shape of an oscillometric envelope, the curve fitting being done by using a plurality of oscillometric pulses along with corresponding cuff pressures obtained during an early part of inflation.
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Abstract
The present application discloses a method of calculating an initial inflation pressure during a blood pressure determination using an NIB system. The cuff provided with the system is inflated towards a default initial inflation pressure and a plurality of oscillometric pulses are obtained during inflation. A quick systolic pressure is estimated from a pre-defined function having a physiologically- expected shape of an oscillometric envelope fitted to oscillometric data obtained during the inflation. In an embodiment, the parameters within the function are specifically found by fitting a plurality of oscillometric pulse amplitudes along with their corresponding cuff pressures obtained during inflation to the pre-defined function. The cuff is inflated up to a calculated initial inflation pressure, which is found from the estimated quick systolic pressure. After the cuff is brought to the initial inflation pressure, deflation is begun for determining the actual systolic and diastolic pressures for output to a user.
47 Citations
17 Claims
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1. A method of calculating an initial inflation pressure, while monitoring blood pressure, comprising the steps of:
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(a) inflating a blood pressure cuff; (b) monitoring for the presence of oscillometric pulses during the inflation of the blood pressure cuff; (c) estimating a quick systolic blood pressure for a patient based on the oscillometric pulses detected during the inflation of the blood pressure cuff; and (d) defining the initial inflation pressure as a predetermined pressure above the estimated systolic pressure; wherein the systolic blood pressure is estimated by curve fitting with a pre-defined function having a physiologically-expected shape of an oscillometric envelope, the curve fitting being done by using a plurality of oscillometric pulses along with corresponding cuff pressures obtained during an early part of inflation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of monitoring blood pressure for a patient, comprising the steps of:
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(a) providing a non-invasive blood pressure (NIB) monitor having a selectively inflatable and deflatable blood pressure cuff and at least one pressure transducer for detecting oscillometric pulses; (b) inflating the blood pressure cuff; (c) generating an oscillometric envelope from the oscillometric pulses obtained when varying cuff pressure during the inflation of the blood pressure cuff; (d) estimating the MAP and diastolic pressures for the patient by curve fitting using a pre-defined function having a physiologically-expected shape of an oscillometric envelope and using a plurality of oscillometric pulse amplitudes obtained during inflation along with their corresponding cuff pressures so that the values of parameters within the function are found to completely specify that same function; and (e) terminating the inflation of the blood pressure cuff at an initial inflation pressure above the estimated systolic blood pressure, where the systolic pressure is estimated from a calibrated cuff pressure oscillation or from a mathematical formula that relates systolic to diastolic and MAP. - View Dependent Claims (14)
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- 12. A method as in claim 12, wherein the oscillometric envelope used for curve fitting is obtained from a portion of the inflation period.
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15. A method of controlling inflation of a cuff during monitoring blood pressure of a patient using a NIB system comprising the steps of:
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(a) providing the patient with a selectively inflatable and deflatable non-invasive blood pressure cuff arranged to be worn about a limb of the patient and operatively connected to a non-invasive blood pressure monitor; (b) estimating a systolic blood pressure for the patient from oscillometric information measured from only part of the inflation pressure range and based on using a pre-defined function having a physiologically-expected shape of an oscillometric envelope for curve fitting to a plurality of oscillometric pulse amplitudes along with their corresponding cuff pressures; and (c) controlling inflation of the blood pressure cuff based on the calculated initial inflation pressure, the initial inflation pressure being obtained from an estimated systolic pressure, during inflation of the blood pressure cuff. - View Dependent Claims (16, 17)
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Specification