Noninvasive blood pressure determination method and apparatus
First Claim
1. A method of noninvasively determining a blood pressure (P) of a patient (2), in whicha) an electrical cardiac potential measurement signal (EM) is detected;
- b) a pulse measurement signal (PM) of a pulse pressure wave which, starting from a patient'"'"'s heart, propagates within blood vessels is detected at a pulse-feeling location (15);
c) a propagating time (T) of the pulse pressure wave between the heart and the pulse-feeling location (15) is determined, based on the electrical measurement signal (EM) and the pulse measurement signal (PM);
d) wherein the blood pressure (P) is determined from the propagating time (T) by means of a function interrelationship that comprises a first portion specifying an active elasticity behaviour of the blood vessels and a second portion specifying a passive elasticity behaviour of the blood vessels.
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Abstract
The method and the apparatus serve for non-invasively determining the blood pressure of a patient. An electrical cardiac potential measurement signal and a pulse-pressure-wave measurement signal are detected which, starting from the heart, propagate within the blood vessels as far as to a pulse-feeling location. A pulse-pressure-wave propagating time between the heart and the pulse-feeling location is determined, based on the electrical measurement signal and the pulse measurement signal. The blood pressure is determined by the aid of a function interrelationship on the basis of the propagating time, with the function interrelationship comprising a first portion that specifies the active elasticity behaviour of the blood vessels, and a second portion that specifies the passive electricity behaviour of the blood vessels. In this way, especially accurate blood pressure determination is rendered possible.
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Citations
10 Claims
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1. A method of noninvasively determining a blood pressure (P) of a patient (2), in which
a) an electrical cardiac potential measurement signal (EM) is detected; -
b) a pulse measurement signal (PM) of a pulse pressure wave which, starting from a patient'"'"'s heart, propagates within blood vessels is detected at a pulse-feeling location (15); c) a propagating time (T) of the pulse pressure wave between the heart and the pulse-feeling location (15) is determined, based on the electrical measurement signal (EM) and the pulse measurement signal (PM); d) wherein the blood pressure (P) is determined from the propagating time (T) by means of a function interrelationship that comprises a first portion specifying an active elasticity behaviour of the blood vessels and a second portion specifying a passive elasticity behaviour of the blood vessels. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for noninvasively determining of a blood pressure (P) of a patient (2), comprising
a) an ECG sensor (3; -
18) for detecting an electrical cardiac potential measurement signal (EM);
b) a pulse sensor (4;
19) for detecting a pulse measurement signal (PM) of a pulse pressure wave which, starting from the heart, propagates within the blood vessels as far as to a pulse-feeling location (15) where the pulse sensor (4;
19) is disposed;c) an evaluation unit (6) for determining a propagation time (T) of the pulse pressure wave between the heart and the pulse-feeling location (15) on the basis of the electrical measurement signal (EM) and the pulse measurement signal (PM); d) wherein the evaluation unit (6) is designed for determining the blood pressure (P) from the propagating time (T) by means of a function interrelationship which comprises a first portion that specifies the active elasticity behaviour of the blood vessels, and a second portion that specifies the passive elasticity behaviour of the blood vessels. - View Dependent Claims (7, 8, 9, 10)
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18) for detecting an electrical cardiac potential measurement signal (EM);
Specification