Method and apparatus for measuring blood pressure
First Claim
1. In an oscillometric blood pressure measuring apparatus of the type measuring pulsatile perturbations in a patient'"'"'s blood pressure at a plurality of different measurement pressures of a sphygmomanometer cuff, to derive a blood pressure model for the patient, the model being stored in the apparatus as a series of pulsatile perturbations together with the associated cuff pressures, the improvement comprising:
- means operative on the stored model for generating a characteristic curve approximating the stored model in the vicinity of a predefined index value of cuff pressure;
means for maintaining the pressure of said cuff within a predetermined range, r, of said index value; and
means jointly responsive to said characteristic curve and to the magnitude of sensed pulsatile perturbations in said cuff pressure for tracking changes in said index value, to estimate a new value for said index value.
3 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus are disclosed for tracking instantaneous changes in blood pressure. The invention is utilized in an oscillometric blood pressure measuring apparatus of the type measuring pulsatile perturbations in a patient'"'"'s blood pressure at a plurality of different measurement pressures of a sphygmomanometer cuff, to derive a blood pressure model for the patient, the model being stored in the apparatus as a series of pulsatile perturbations and the associated cuff pressures. A characteristic curve is generated so as to approximate the stored model in the vicinity of a predefined index value of cuff pressure. The pressure of the cuff is maintained within a predetermined range, r, of the index value, while changes in the index value are tracked by sensing a pulsatile perturbation in the cuff pressure, deriving the corresponding value for cuff pressure from the characteristic curve, and utilizing the derived pressure as a new estimate for the index value. In a preferred embodiment, the characteristic curve is realized as an equation defining a straight line.
-
Citations
36 Claims
-
1. In an oscillometric blood pressure measuring apparatus of the type measuring pulsatile perturbations in a patient'"'"'s blood pressure at a plurality of different measurement pressures of a sphygmomanometer cuff, to derive a blood pressure model for the patient, the model being stored in the apparatus as a series of pulsatile perturbations together with the associated cuff pressures, the improvement comprising:
-
means operative on the stored model for generating a characteristic curve approximating the stored model in the vicinity of a predefined index value of cuff pressure; means for maintaining the pressure of said cuff within a predetermined range, r, of said index value; and means jointly responsive to said characteristic curve and to the magnitude of sensed pulsatile perturbations in said cuff pressure for tracking changes in said index value, to estimate a new value for said index value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A method for use in an oscillometric blood pressure measuring apparatus of the type measuring pulsatile perturbations in a patient'"'"'s blood pressure at a plurality of different measurement pressures of a sphygmomanometer cuff, to derive a blood pressure model for the patient, the model being stored in the apparatus as a series of pulsatile perturbations and the associated cuff pressures, the method comprising the steps of:
-
generating a characteristic curve approximating the stored model in the vicinity of a predefined index value of cuff pressure; maintaining the pressure of said cuff within a predetermined range, r, of said index value; and tracking changes in said index value by sensing a pulsatile perturbation in said cuff pressure, deriving the corresponding value for cuff pressure from said characteristic curve, and utilizing the derived pressure as a new estimate for the index value. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
-
Specification