Pumps – Condition responsive control of pump drive motor – By control of electric or magnetic drive motor
Reexamination Certificate
2008-03-04
2008-03-04
Kramer, Devon C. (Department: 3746)
Pumps
Condition responsive control of pump drive motor
By control of electric or magnetic drive motor
C417S043000, C417S045000, C417S012000, C604S153000
Reexamination Certificate
active
07338260
ABSTRACT:
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.
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Allen Tim
Brundle Alan
Dao Son
Baxier International Inc.
Bell Boyd & Lloyd LLP
Foley Austin J.
Frantz Jessica L
Kramer Devon C.
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