Apparatus and method for non-invasively monitoring a...

A - Human Necessities – 61 – B

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A61B 5/022 (2006.01)

Patent

CA 2338233

Apparatus is disclosed for non-invasively monitoring a subject's blood pressure, in which a pressure sensor assembly (14) that includes a pressure transducer (50) is compressed against tissue overlying an artery, with sufficient force to compress the artery. A motor (32) first servo control system optimizes the amount of artery compression, which occurs at a mean transmural pressure of about zero, by modulating one side of a lever arm (36) compressing the assembly against the tissue, creating a pressure signal indicative of transmural pressure. Since different pressure effects are realized according to the amount of artery compression, an appropriate control signal can be produced that provides for a second motor (34) to adjust the other side of the lever arm (36) to provide the optimum compression of the assembly into the tissue overlying the artery. The apparatus is optimally positioned over an artery by including an ultrasonic blood flow sensor configured to sense the flow of blood under the pressure transducer.

L'invention concerne un dispositif permettant de contrôler de manière non invasive la pression sanguine d'un sujet. Dans ce dispositif, un système (14) de capteur de pression comprenant un transducteur (50) de pression est pressée contre les tissus recouvrant une artère, avec une force suffisante pour comprimer cette artère. Un premier système de servocommande à moteur (32) réalise un degré optimal de compression artérielle, qui correspond à une pression transmurale moyenne d'environ 0, en modulant un côté d'un bras (36) de levier qui presse le système contre les tissus, générant ainsi un signal de pression indiquant une pression transmurale. Etant donné que différents effets de pression se produisent selon le degré de compression artérielle, le dispositif peut générer un signal de commande approprié afin qu'un second moteur (34) ajuste l'autre côté du bras (36) de levier de manière à obtenir une pression optimale du système sur les tissus recouvrant l'artère. Le dispositif est positionné de manière optimale sur une artère grâce à un capteur de débit sanguin intégré, conçu pour détecter le débit sanguin sous le transducteur de pression.

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