Method for compensating for pressure differences across...

A - Human Necessities – 61 – M

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A61M 5/172 (2006.01)

Patent

CA 2649867

A pump used to infuse a fluid into a patient is controlled in accordance with an algorithm that enables a microprocessor (17) to monitor and adjust each pump cycle to compensate for a differential pressure between the pump's inlet and outlet. The algorithm defines a fluid delivery protocol that is applied in controlling the operation of the pump to achieve a desired rate, volume, and timing of the fluid infusion. Fluid is delivered by the pump when a plunger (42) compresses an elastomeric membrane (29) overlying a fluid chamber (30). Due to the small volume of the chamber, an incremental change in the plunger position before the delivery stroke produces a significant change in the delivery pressure. At the beginning of a pump cycle, the microprocessor determines the differential pressure between the inlet and outlet of the pump, and adjusts the plunger position before the delivery stroke to compensate for the differential pressure. A retraction of the plunger from the home position decreases the delivery pressure of the fluid, and an advancement of the plunger increases it. After the position of the plunger is adjusted to compensate for the differential pressure, the pump cycle proceeds. Following the plunger stroke, the outlet pressure is used to determine the actual volume of fluid delivered. The duration of the plunger stroke in the next pump cycle is adjusted to compensate for any volume delivery error produced by the differential pressure compensation.

Une pompe servant à perfuser un liquide dans un patient est commandée par un algorithme qui permet à un microprocesseur (17) de surveiller et de régler chacun des cycles de pompe en vue de pallier la différence de pression entre l'entrée et la sortie de la pompe. L'algorithme définit un protocole de perfusion du liquide qui commande l'opération de la pompe en fonction d'un taux, d'un volume et d'un minutage voulus. La pompe perfuse le liquide lorsqu'un piston (42) vient comprimer une membrane d'élastomère (29) qui recouvre une chambre de liquide (30). En raison du volume restreint de la chambre, une modification marginale apportée à la position du piston avant la fin de sa course a pour effet de modifier la pression de perfusion de façon importante. Au début d'un cycle de pompe, le microprocesseur détermine la pression différentielle entre l'entrée et la sortie de la pompe et règle la position du piston avant la fin de sa course afin de pallier la différence de pression. Un retrait du piston de sa position de départ réduit la pression de perfusion du liquide et un avancement l'accroît. Une fois réglée la position du piston en fonction de la pression différentielle, le cycle de pompe se poursuit. Lorsque le piston parvient à la fin de sa course, la pression de sortie sert à calculer le volume de liquide perfusé. La durée de la course du piston est réglée au cours du cycle de pompe suivant pour pallier la différence de volume de liquide qui a pu résulter de la régulation de la pression.

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