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Publication Number
US-10518037-B2
Publication Date
2019-12-31
Expiration Date
Abstract
An injection device includes a housing having a receptacle for a vessel for holding injection fluid; an operator-manipulated element for setting an injection dose; a dosing member rotatable about a longitudinal center axis relative to the housing when setting the injection dose; a feed part; and, a latching unit acting between the feed part and housing. The dosing member has a zero position whereat no dose is set and an injection position whereat an intended dose of injection fluid is set. A spring acts between the dosing member and the housing to return the dosing member from an intermediate position to the injection position or a zero position.
Core Innovation
The invention relates to an injection device comprising a housing having a longitudinal axis, an adjustment sleeve, and an internal tube axially and rotationally fixed to an inside portion of the housing. A dosing member is threadedly connected to the housing so that rotation of the adjustment sleeve during dose setting causes rotation of the dosing member relative to the housing and the internal tube, and simultaneously moves the dosing member axially in a distal direction.
Dose setting is defined by a latching device comprising two longitudinal ribs and a catch. Engagement of the catch with one of the longitudinal ribs defines an intended set dose, whereas rotation of the dosing member to positions where the catch is not engaged with one of the longitudinal ribs defines unintended doses. A torsion spring acts between the dosing member and the internal tube so that, if during dose setting rotation of the adjustment sleeve is stopped at an unintended dose, the torsion spring causes the dosing member to return to a previous intended set dose.
In embodiments, the threaded engagement includes a piston rod threadedly engaged with a feed part, wherein the threaded engagement comprises a first thread on the piston rod and a second thread on the feed part, and the first thread and the second thread each have a defined pitch. The threaded connection between the housing and dosing member has a pitch that is greater than the defined pitch of the threaded connection between the piston rod and the feed part.
Claims Coverage
The partial content provides two independent claims. Each independent claim centers on a latching device that distinguishes intended and unintended set doses, combined with a torsion spring that returns the dosing member to a previous intended set dose when dose setting stops at an unintended dose; one independent claim further specifies thread-and-pitch relationships among the housing-to-dosing-member connection and the piston-rod-to-feed-part connection.
Latching-defined intended and unintended set doses
An injection device with a latching device comprising two longitudinal ribs and a catch, where engagement of the catch with one longitudinal rib defines an intended set dose, and where rotation to positions where the catch is not engaged defines unintended doses.
Torsion-spring return from unintended dose to previous intended set dose
A torsion spring acting between the dosing member and the internal tube that causes the dosing member to return to a previous intended set dose if rotation of the adjustment sleeve is stopped during dose setting at an unintended dose.
Threaded dose setting causing relative rotation and distal axial movement
A dosing member threadedly connected to the housing such that rotation of the adjustment sleeve during dose setting causes rotation of the dosing member relative to the housing and the internal tube and simultaneously moves the dosing member axially in a distal direction.
Thread pitch hierarchy between housing-to-dosing-member and piston-rod-to-feed-part
A piston rod threadedly engaged with a feed part, where the threaded engagement comprises a first thread on the piston rod and a second thread on the feed part with each having a defined pitch, and where the threaded connection between the housing and dosing member has a pitch greater than the defined pitch of the threaded connection between the piston rod and the feed part.
Across both independent claims, the core claimed coverage is the combination of a latching device that defines intended versus unintended set doses using engagement of a catch with longitudinal ribs, and a torsion spring that returns the dosing member to a previous intended set dose when dose setting stops at an unintended dose position. The second independent claim additionally defines specific threaded pitch relationships between the housing-to-dosing-member connection and the piston-rod-to-feed-part threaded connection.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Not explicitly described in patent.
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