Drug Delivery Device with Air-in-Cartridge Safety Feature
OwnerCarsten Schau Andersen, Mads Moeller +2inventors
InventorsCarsten Schau Andersen, Mads Moeller, Michael Svendsmark Hansen, Torkil Filholm
Life of this patent
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Abstract
A drug delivery device adapted to receive a drug-filled cartridge (10), comprising dose setting means allowing a user to set a desired dose of drug to be expelled, an electronic controller (70,270) adapted to control a motor (51) to move a drive member to thereby expel an amount of drug from a received cartridge corresponding to a set dose, and means for estimating the amount of free air in a loaded cartridge. The controller is adapted to detect an error state if the estimated amount of free air in the cartridge is larger than or equals a given percentage of the amount of drug corresponding to a set dose.
Claims15
A drug delivery device, comprising:
- a drug-filled cartridge or a compartment for receiving a drug-filled cartridge in a loaded position, the cartridge comprising an outlet and an axially displaceable piston,
- a drug expelling mechanism comprising:
- a drive member adapted to engage and axially move the piston of a loaded cartridge to thereby expel an amount of drug from the cartridge through the outlet, and
- a motor for moving the drive member,
- a dose setting structure allowing a user to set a desired dose of drug to be expelled,
- an electronic controller adapted to control the motor to move the drive member to thereby expel an amount of drug corresponding to a set dose, and
- a structure for estimating the amount of free air in a loaded cartridge,
- wherein the electronic controller is further adapted to detect an error state if the estimated amount of free air in the cartridge is larger than or equals a given percentage of the amount of drug corresponding to a set dose.
A method of operating a drug delivery device, comprising the steps of:
- providing a drug delivery device comprising:
- a drug-filled cartridge comprising an outlet and an axially displaceable piston,
- a drug expelling mechanism comprising:
- a drive member adapted to engage and axially move the piston of a loaded cartridge to thereby expel an amount of drug from the cartridge through the outlet, and
- a motor for moving the drive member,
- a dose setting structure allowing a user to set a desired dose of drug to be expelled,
- an electronic controller adapted to control the motor to move the drive member to thereby expel an amount of drug corresponding to a set dose, and
- a structure for estimating the amount of free air in the cartridge,
- estimating the amount of free air in the cartridge,
- setting a dose to be expelled, and
- detecting an error state if the estimated amount of free air in the cartridge is larger than or equals a given percentage of the amount of drug corresponding to the set dose.
Dependencies are inferred from the claim text.