Dispensing fluid from an infusion pump system
First Claim
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1. A method of dispensing medicine from an infusion pump device, comprising:
- resetting a ratchet mechanism in a drive system of an infusion pump device by activating an electrically powered actuator to provide a reset force to the ratchet mechanism;
driving the ratchet mechanism in a forward direction to advance a piston rod during a drive step so as to dispense a medicine from the infusion pump device,wherein the electrically powered actuator is decoupled from the ratchet mechanism during the drive step while the piston rod is advanced and subsequently couples with the ratchet mechanism to provide the reset force to the ratchet mechanism.
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Abstract
Some embodiments of a medical infusion pump system include a pump device having a cap device that mates with a pump housing to retain a medicine cartridge therein. In addition to retaining the medicine cartridge in the pump housing, the cap device may perform a number of preparatory functions or safety functions. In addition or in the alternative, some embodiments of the pump device may include a drive system that advances a piston rod to dispense medicine to the patient in a safe and energy efficient manner.
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Citations
16 Claims
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1. A method of dispensing medicine from an infusion pump device, comprising:
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resetting a ratchet mechanism in a drive system of an infusion pump device by activating an electrically powered actuator to provide a reset force to the ratchet mechanism; driving the ratchet mechanism in a forward direction to advance a piston rod during a drive step so as to dispense a medicine from the infusion pump device, wherein the electrically powered actuator is decoupled from the ratchet mechanism during the drive step while the piston rod is advanced and subsequently couples with the ratchet mechanism to provide the reset force to the ratchet mechanism. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification