Oscillometric method of determining haemodynamic indicators...

Details Oscillometric method of determining haemodynamic indicators... Oscillometric method of determining haemodynamic indicators...

A - Human Necessities

61

B

A61B 5/02 (2006.01)

Patent

CA 2182276

An oscillometric method for determining the hemodynamic parameters of the arterial portion of a patient's circulatory system, consisting in recording of pulse pressure waves (3) in a major arterial vessel (1) under examination, due to the ef- fect of a linearly varying pressure (2) in a vessel-constrict- ing pressure measuring cuff (10), with the result that a clos- ed contour (ABCDLKFEA) is formed within a single measuring cycle, which is established by straight lines (AB), (BC), and (CD) in the diastolic portion of an oscillometric curve (4), and by straight lines (EF), and (FK) and KL) in the systolic por- tion of the curve (4), points (B), (C), (F), and (K) of inter- section of said straight lines being the signs of the arteri- al pressure, and amplitude values (Cc) and (Bb) of the afore- mentioned pulse waves (3) in the contour determine geometrical parameters (dS) and (S) of the major arterial vessel (1) under examination; a measuring system for carrying the method into effect geatures a linear characteristic of conversion and a straight horizontal amplitude-frequency response in a frequen- cy range of approximately from 0 to 50 Hz along the entire path of conversion, amplification, and recording of signals.

Le procédé oscillométrique proposé de détérmination d'indicateurs hémodynamiques dans la circulation artérielle d'un patient consiste à enregistrer des ondes (3) d'impulsions de pression dans un vaisseau principal (1), lequel est soumis à une pression (2) changeante de façon linéaire dans un brassard (10) de pression de mesure. Sur cette base, on forme un profil fermé (ABCDLKFE) pendant un cycle de mesure, le profil étant constitué de lignes droites (A, B), (B, C) et (C, D) dans la partie diastolique de la courbe oscillométrique (4), et des lignes (E, F), (F, K) et (K, L) dans la partie systolique. Les points d'intersection (B), (C), (F) et (K) indiquent la pression artérielle, alors que les valeurs d'amplitude (Cc) et (Bb) des ondes d'impulsion (3) dans le profil définissent les paramètres géométriques (dS) et (S) de l'artère principale (1) en question. Le système de mesure destiné à l'application de ce procédé présente une caractéristique de conversion d'amplitude linéaire, ainsi qu'une caractéristique de fréquence d'amplitude horizontale rectiligne dans une plage de fréquences comprise entre approximativement 0 et 50 Hz sur la totalité du canal de conversion, d'amplification et d'enregistrement de signaux.

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