System and method for controlling current provided to a...

G - Physics – 05 – B

Patent

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G05B 19/40 (2006.01) A61M 5/142 (2006.01) H02P 8/22 (2006.01)

Patent

CA 2556606

A system and method is disclosed for controlling the input electrical current to an infusion pump stepper motor based on predetermined torque requirements. The system can include a motor controller and a non-volatile memory containing expected load torque values throughout a pump cycle. Responsive to the expected load torque values, the motor controller provides the stepper motor with a varying electrical current for overcoming load torque at each point in the pumping cycle. Additional factors can also be considered for varying the electrical current. These factors include, but are not limited to, temperature, pressure, and elapsed operating time.

L'invention concerne un système et un procédé permettant de réguler le courant électrique d'entrée acheminé jusqu'à un moteur pas-à-pas de pompe à infusion, en fonction des nécessités de couple prédéterminés. Ledit système peut comprendre un dispositif de commande de moteur et une mémoire non volatile renfermant des valeurs de couple de charge prévues au cours d'un cycle de pompe. En réponse aux valeurs de couple de charge prévues, le dispositif de commande du moteur fournir au moteur pas-à-pas un courant électrique variant de manière à surmonter le couple de charge au niveau de chaque point du cycle de pompage. Des facteurs supplémentaires peuvent également être pris en compte en vue de faire varier le courant électrique. Ces facteurs comprennent la température, la pression et le temps de fonctionnement écoulé, mais ils ne se limitent pas à ceux-ci.

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