Dose delivery mechanism
AssigneeNorton Healthcare Limited
InventorsKarl James Hewson, George Bostock, George Robert Michael Savell
Life of this patent
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Abstract
An injection device comprises a housing having a first longitudinal axis (L). The injection device further comprises a medicament cartridge holder and a drive assembly including a drive shaft. The drive shaft is arranged around the first longitudinal axis. The drive assembly is capable of providing an axial force for ejecting a dose of medicament from the injection device. The medicament cartridge holder and at least part of said drive assembly are arranged around a second longitudinal axis (LC) which is substantially parallel to but offset from the first longitudinal axis.
Claims21
An injection device comprising:
- a. a housing having a first longitudinal axis;
- b. a medicament cartridge holder arranged around a second longitudinal axis which is substantially parallel to but offset from the first longitudinal axis;
- and
- c. a drive assembly including a drive shaft arranged concentrically about said first longitudinal axis, a worm gear engaged in a rack wherein rotation of said worm gear about the first longitudinal axis causes the rack to advance axially forward or backward with respect to said worm gear, and a worm gear rotational lock engageable with the worm gear so as to substantially prevent rotation of the worm gear when engaged with the worm gear.
An injection device comprising:
- a. a housing having a first longitudinal axis;
- b. a medicament cartridge holder arranged around a second longitudinal axis which is substantially parallel to but offset from the first longitudinal axis;
- and
- c. a drive assembly including a drive shaft arranged concentrically about said first longitudinal axis, a worm gear engaged in a rack wherein rotation of said worm gear about the first longitudinal axis causes the rack to advance axially forward or backward with respect to said worm gear, and a worm gear rotational lock engageable in a forward end of the worm gear.
Dependencies are inferred from the claim text.