External blood pressure sensor apparatus and method

Details External blood pressure sensor apparatus and method External blood pressure sensor apparatus and method

A - Human Necessities

61

B

A61B 5/00 (2006.01) A61B 5/0215 (2006.01) A61B 5/0456 (2006.01) A61M 1/10 (2006.01)

Patent

CA 2289715

This invention is an apparatus and method for measuring the blood pressure of a patient with a permanent or temporary cardiac assist device throughout an entire cardiac cycle by partially filling the inflatable chamber (10) of the cardiac assist device operatively disposed with respect to an aorta with pressurized fluid, and using the partially filled chamber (10) as a transducer. An external pressure sensor (36) is located in a drive unit (18) connected to the inflatable chamber (10). The drive unit (18) controls, monitors, and stores the fluid pressure with respect to the inflatable chamber (10). When isolated from a pressurized fluid reservoir (30, 44) the pressure in the inflatable chamber (10) corresponds to the current blood pressure of the patient through the cardiac cycle. The inflatable chamber (10) is preferably defined by a flexible membrane.

L'invention porte sur un appareil et un procédé de mesure de la pression sanguine d'un patient à l'aide d'un dispositif permanent ou temporaire d'assistance cardiaque sur un cycle cardiaque complet. Le procédé consiste à remplir partiellement d'un fluide sous pression la chambre gonflable (10) du dispositif d'assistance cardiaque fonctionnellement disposée par rapport à l'aorte et à utiliser la chambre (10) partiellement remplie comme transducteur. Un capteur de pression extérieur (36) est placé dans une unité de commande (18) reliée à la chambre gonflable (10). Ladite commande règle, suit, et enregistre la pression du fluide dans la chambre gonflable (10). Si on l'isole du réservoir de fluide sous pression (30, 44), la pression de la chambre gonflable (10) correspond à la pression sanguine instantanée du patient pendant le cycle cardiaque. La chambre gonflable (10) est de préférence constituée par une membrane souple.

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