Drug injection device
Inventors
Harvey, Oliver Taylor • Hurlstone, Christopher John • Sands, Isobel Rachel • Sinclair, Rhona Ann
Assignees
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Publication Number
US-11918790-B2
Publication Date
2024-03-05
Expiration Date
Abstract
A drug injection device includes a last dose setting having a main drive pin, a drive wheel, a driven wheel, an abutment element fixedly coupled to, or integrally formed with, the driven wheel. The drive wheel has a rotation axis parallel to a longitudinal axis and is configured to be driven about the longitudinal axis by a knob and to be periodically driven in rotation about the rotation axis by the main drive pin, during a drug dose setting. The driven wheel has a second rotation axis parallel or coaxial to said longitudinal axis and is configured to be periodically driven about the longitudinal axis by the drive wheel. The abutment element is configured to prevent the rotation of the drive wheel about the longitudinal axis when the knob has made a predetermined number of full and/or partial rotations about the longitudinal axis correlated to the predetermined drug volume.
Core Innovation
The invention relates to a pen-type drug injection device with a drug container extending along a longitudinal axis and configured to include a predetermined drug volume. A dose setting mechanism sets a drug dose to be delivered out of the drug container, and a dose delivery mechanism delivers the drug dose set by the dose setting mechanism. A knob rotates about the longitudinal axis during drug dose setting, where the rotation is correlated to drug volume.
A last dose setting device is configured to prevent a user to set a drug dose greater than the drug volume remaining in the drug container after at least one previous drug dose delivery. The last dose setting device comprises a main drive pin and a drive wheel/driven wheel arrangement that limits relative rotation based on a predetermined number of full and/or partial knob rotations about the longitudinal axis.
During drug dose setting, the main drive pin periodically drives the drive wheel in rotation about a first rotation axis parallel to the longitudinal axis, and the drive wheel periodically drives a driven wheel in rotation about a second rotation axis parallel or coaxial to the longitudinal axis. The driven wheel includes an abutment element fixedly coupled to, or integrally formed with, the driven wheel, and the abutment element prevents rotation of the drive wheel about the longitudinal axis when the knob has made the predetermined number of full and/or partial rotations correlated to the predetermined drug volume.
In some embodiments, the last dose setting device further includes a stop member configured to abut against the abutment element to prevent rotation of the driven wheel about the second rotation axis when the knob has made the predetermined number of rotations and the drive wheel abuts against the main drive pin. Multiple structural embodiments are described for implementing these interactions and preventing a user from setting or exceeding the available remaining drug volume through the dose setting process.
Claims Coverage
The document describes one independent claim covering a drug injection device having a dose setting mechanism, dose delivery mechanism, a knob-based dose setting rotation, and a last dose setting device that enforces a limit on dose setting by preventing wheel rotation after a predetermined knob-rotation count correlated to remaining drug volume. The inventive features focus on preventing dose setting beyond remaining drug volume using a main drive pin, drive wheel/driven wheel, and abutment/stop members with periodic rotation behavior.
Preventing last dose exceeding remaining drug volume via last dose setting device
A last dose setting device configured to prevent a user to set a drug dose greater than the drug volume remaining in the drug container after at least one previous drug dose delivery, correlated to a predetermined number of full and/or partial knob rotations about the longitudinal axis.
Main drive pin translation with drive-wheel periodic rotation
A main drive pin which is stationary or configured to move along a first direction of the longitudinal axis without rotating about the longitudinal axis during the drug dose setting and to move along a second direction opposite to the first direction without rotating about the longitudinal axis during a drug dose delivery, and that periodically drives the drive wheel in rotation about a first rotation axis during the drug dose setting.
Drive wheel and driven wheel periodic rotation about parallel/coaxial axes
A drive wheel having a first rotation axis parallel to the longitudinal axis and driven in rotation about the longitudinal axis by the knob, and periodically driven in rotation about the first rotation axis by the main drive pin during the drug dose setting; and a driven wheel having a second rotation axis parallel or coaxial to the longitudinal axis and periodically driven in rotation about the second rotation axis by the drive wheel.
Abutment element preventing drive-wheel rotation after predetermined knob rotations
An abutment element fixedly coupled to, or integrally formed with, the driven wheel and configured to prevent the rotation of the drive wheel about the longitudinal axis when the knob has made a predetermined number of full and/or partial rotations about the longitudinal axis correlated to the predetermined drug volume, including configurations where the drive wheel abuts against the main drive pin and the abutment element.
Stop member preventing driven-wheel rotation about second rotation axis
A stop member configured to abut against the abutment element and to prevent the rotation of the driven wheel about the second rotation axis when the knob has made the predetermined number of full and/or partial rotations about the longitudinal axis and the drive wheel abuts against the main drive pin.
Across the independent claim, the core inventive coverage is the last dose setting device that, using a main drive pin with drive wheel/driven wheel periodic rotation about parallel/coaxial axes and an abutment element, and optionally a stop member, prevents further rotation once the knob has made a predetermined rotation count correlated to remaining drug volume, thereby preventing setting a drug dose greater than what remains.
Stated Advantages
Prevents a user from setting a drug dose greater than the drug volume remaining in the drug container after at least one previous drug dose delivery.
Documented Applications
Pen-type drug injection device having a last dose setting device that limits dose setting based on a predetermined number of knob rotations correlated to remaining drug volume.
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