Apparatus and method for measuring hemodynamic parameters
First Claim
1. Apparatus An apparatus for measuring hemodynamic parameters, by non-invasive, cuff based occlusive, blood pressure measurement, which apparatus comprises occlusive, oscillometric automatic blood pressure meter and units, determining the values of hemodynamic parameters, comprisingan oscillation wave separating and storing signal detector for detecting an oscillation signal, the sampling rate thereof is at least 200/heart cycle;
- and said signal detector has a storage unit resolution that is organized at least 9 bit,a digital anti-filter connected to the signal detector to compensate the distortions rising at sampling, separating and digitizing the oscillation wave, detected by the signal detector,an amplitude arithmetic unit connected to the anti-filter establishing an Augmentation Index (Aix); and
a synthesizing unit connected to the anti-filter establishing an Ejection Duration (ED).
0 Assignments
0 Petitions
Accused Products
Abstract
An apparatus for measuring hydrodynamic parameters, especially for Augmentation Index (Aix) and/or Ejection Duration (ED), by non-invasive, cuff based occlusive, blood pressure measurement, which apparatus comprises occlusive, oscillometric automatic blood pressure meter and units. There can also be a method for non-invasive measurement of hemodynamic characteristics, especially AN and/or ED with an occlusive, pressure sensor cuff, placed on the brachial artery, wherein the apparatus according to the invention samples and analyzes and evaluates the signal flow of the oscillations of pulse waves using an unusual stepwise blood pressure measurement.
-
Citations
11 Claims
-
1. Apparatus An apparatus for measuring hemodynamic parameters, by non-invasive, cuff based occlusive, blood pressure measurement, which apparatus comprises occlusive, oscillometric automatic blood pressure meter and units, determining the values of hemodynamic parameters, comprising
an oscillation wave separating and storing signal detector for detecting an oscillation signal, the sampling rate thereof is at least 200/heart cycle; - and said signal detector has a storage unit resolution that is organized at least 9 bit,
a digital anti-filter connected to the signal detector to compensate the distortions rising at sampling, separating and digitizing the oscillation wave, detected by the signal detector, an amplitude arithmetic unit connected to the anti-filter establishing an Augmentation Index (Aix); and a synthesizing unit connected to the anti-filter establishing an Ejection Duration (ED). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- and said signal detector has a storage unit resolution that is organized at least 9 bit,
-
9. A method for non-invasive measurement of hemodynamic characteristics comprising the steps of:
-
(a) performing a standard stepwise blood pressure measurement using an occlusive, pressure-sensor cuff placed on the brachial artery; (b) storing systolic blood pressure (SBP), diastolic blood pressure (DBP), and heart rate (HR) values; (c) subsequently setting the cuff to supra-systolic pressure range over the systolic pressure; (d) performing a pressure oscillometric pulse wave detection at supra-systolic pressure range, receiving oscillation curve and simultaneously by an “
anti-filter”
process compensating for signal distortions appearing at sampling;(e) calculating an Augmentation Index (Aix) on the basis of the wave amplitudes from the oscillation curves so received; and (f) calculating the Ejection Duration (ED) value on the oscillating curve determining the minimum point after the first reflex wave. - View Dependent Claims (10, 11)
-
Specification