Injection device
AssigneeHaselmeier AG
InventorsJoachim Keitel, Daniel MacDonald, Herbert Bechtold
Life of this patent
Estimating the term…
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.
Claims15
An injection device comprising:
- a housing having a longitudinal axis;
- an adjustment sleeve;
- an internal tube axially and rotationally fixed to an inside portion of the housing;
- 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;
- a latching device comprising two longitudinal ribs and a catch, where engagement of the catch with one of the longitudinal ribs defines an intended set dose and where rotation of the dosing member to positions where the catch is not engaged with one of the longitudinal ribs defines unintended doses;
- and,
- a torsion spring acting between the dosing member and the internal tube, where if during dose setting rotation of the adjustment sleeve is stopped at an unintended dose the torsion spring will cause the dosing member to return to a previous intended set dose.
An injection device comprising:
- a housing having a longitudinal axis;
- an adjustment sleeve;
- an internal tube axially and rotationally fixed to an inside portion of the housing;
- 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;
- a latching device comprising two longitudinal ribs and a catch, where engagement of the catch with one of the longitudinal ribs defines an intended set dose and where 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 acting between the dosing member and the internal tube, where if during dose setting rotation of the adjustment sleeve is stopped at an unintended dose the torsion spring will cause the dosing member to return to a previous intended set dose;
- and,
- 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, wherein the first thread and the second thread each have a defined pitch, where 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.
Dependencies are inferred from the claim text.