System and method for controlling pressure in a surgical...

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/135 (2006.01) A61B 5/025 (2006.01) A61B 5/1455 (2006.01)

Patent

CA 2534329

A system and method of controlling the pressure within a pressure cuff of a surgical tourniquet so as selectively to occlude blood flow within a portion of a limb of a patient, wherein a sensor determines when flow past the tourniquet is occurring so that corrective action may be taken, such as by increasing the pressure in the tourniquet or by notifying an operator of the flow past the tourniquet. The present invention may use an acoustic sensor to detect Korotkoff sounds indicating incipient blood flow past the tourniquet. When such signals are detected, the tourniquet controller may either incrementally increase the pressure in the tourniquet, or if a threshold would be exceeded by such an increase, signal an alarm indicative of the blood flow.

La présente invention concerne un système et un procédé pour commander la pression dans un brassard compressif d'un garrot chirurgical, de façon à bloquer la circulation sanguine dans une partie d'un membre d'un patient. Selon cette invention, un capteur détermine lorsque la circulation passe au-delà du garrot, de façon à pouvoir exercer une action correctrice, notamment en augmentant la pression dans le garrot ou en indiquant à un opérateur que la circulation passe au-delà du garrot. Cette invention peut mettre en oeuvre un capteur acoustique pour détecter des bruits de Korotkoff indiquant un début de circulation sanguine au-delà du garrot. Lorsque de tels signaux sont détectés, le système de commande de garrot peut soit augmenter progressivement la pression dans le garrot, soit, si un seuil était dépassé par une telle augmentation, déclencher une alarme indiquant la circulation sanguine.

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