Dosing system for an injection device

Inventors

Scheurer, Simon • Hostettler, Patrick • Hirschel, Jürg

Assignees

Ypsomed AG

Abstract

A dosing system for an injection device for dispensing a dose of a product includes a housing having a longitudinal axis, a dose-setting element, a holding element and a coupling sleeve for driving a driving device for dispensing the dose. The dose-setting element, holding element, and coupling sleeve may be accommodated in the housing. To set and correct the dose, the dose-setting element and the coupling sleeve move in the direction of the longitudinal axis relative to the housing, and the coupling sleeve may be held the holding element rotationally fixed by relative to the housing. To dispense the dose, the coupling sleeve may rotate relative to the housing, the dosing system including a guide in the housing, in which guide the holding element may be displaced in the direction of the longitudinal axis relative to the housing and be guided in a rotationally fixed manner relative to the housing.

Core Innovation

The invention relates to a dosing device for an injection apparatus for dispensing a dose of a product. The dosing device includes a housing having a longitudinal axis, a dose setting element configured as a dosing sleeve for setting the dose, and a holding element. The holding element is coupled to the dosing sleeve such that the holding element and the dosing sleeve are rotatable but axially fixed relative to each other, and at least a portion of these elements together with a coupling sleeve are arranged in the housing.

For setting and correcting the dose, the dosing sleeve, the holding element, and the coupling sleeve are movable relative to the housing in the direction of the longitudinal axis. During this setting and correction, the coupling sleeve is held in a rotationally fixed manner relative to the housing by the holding element. The housing further comprises a guide in which the holding element is displaceable along the longitudinal axis relative to the housing during the setting and correction, such that the holding element is guided in a rotationally fixed manner relative to the housing.

For dispensing the dose, the coupling sleeve is releasable by the holding element, such that the coupling sleeve is rotatable relative to the housing. The document emphasizes holding rotational fixation during setting and correction while enabling rotation during dispensing, including guide structures that keep the holding element rotationally fixed via a guide.

Claims Coverage

The document includes three independent claims, each focused on dosing and dispensing in an injection apparatus with a housing, a dose setting element as a dosing sleeve, a holding element, and a coupling sleeve. Across the independent claims, the core inventive concept is rotating and axially fixing relations during dose setting and correction, combined with releasable rotation for dispensing, using a housing guide that maintains rotational fixation of the holding element.

Overall, the independent claims cover a dosing device and injection device architecture where the dosing sleeve, holding element, and coupling sleeve move axially for setting and correction while maintaining rotational fixation of the coupling sleeve via the holding element, then release to allow rotational coupling during dispensing. The housing guide displaces the holding element along the longitudinal axis while maintaining its rotationally fixed relation to the housing.

Stated Advantages

Documented Applications