Flow controlled blood pump system

A - Human Necessities – 61 – M

Patent

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Details

A61M 1/12 (2006.01) A61M 1/10 (2006.01)

Patent

CA 2304196

A system for pumping blood to assist or assume the cardiac function of a patient, is characterized by a blood pump (14) that exhibits a steep performance curve such that only small changes in pump flow occur for large changes in differential pressure across the pump. The pump therefore exhibits flow limiting characteristics to protect the physiological system against harmful flow rates or pressures. Pump flow may also be limited by controlling the current provided to a driver (26) from a power supply (16), or by suitable restrictions within or external to the pump housing (100).

Ce système de pompage du sang est destiné à suppléer en tout ou partie les fonctions cardiaques d'un patient. En l'occurrence, la pompe à sang (14) est caractérisée par une courbe de rendement dont la pente fait que le débit d'écoulement ne varie pratiquement pas malgré de grandes variations du différentiel de pression lors du passage dans la pompe. La pompe présente donc des caractéristiques de limitation de débit permettant de protéger le système physiologique contre des débits ou des pressions de flux dangereux. Pour limiter le débit de la pompe, on peut également intervenir au niveau de la régulation du courant fourni par l'alimentation électrique (16) à un module de commande (26). Il est également possible d'imposer des restrictions appropriées intérieurement ou extérieurement au carter (100) de la pompe.

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