Dose setting device for an injection device

Inventors

Burren, Stefan • Hirschel, Jürg • Martinoia, Samuel • Moser, Ulrich • Tschirren, Markus

Assignees

Ypsomed AG

Abstract

A dosing device for an injection device, the dosing device including an actuating element for adjusting and/or dispensing a dose from the injection device, a thrust element for generating a forward movement for discharging a dose and a coupling to which the actuating element and the thrust element are coupled such that a rotational movement of the actuating element is transmitted directly to the thrust element and an axial movement of the actuating element is different than an axial movement of the thrust element.

Core Innovation

The disclosed invention relates to an injection device with an ampoule containing a substance and a dose setting device. The dose setting device includes a restrictor element for restricting a maximum total dose of substance that can be set and dispensed, and a rotatable operating element that is operatively coupled with the restrictor element so that the restrictor rotates and moves toward a stop during dose setting, thereby blocking movement of the operating element in a dose setting direction.

During dispensing, a drive element comprising a threaded rod pushes on a stopper of the ampoule, and the threaded rod is guided in an internal thread of the dose setting device and in a unidirectional rotation locking element. The stop that blocks the restrictor and limits the maximum total dose is defined as an end of a thread of the threaded rod and/or an axial stop and/or a radial stop on the threaded rod.

The dose setting device further includes a housing with an insert configured as a threaded sleeve, in which the operating element is in threaded engagement with the insert. The operating element can be screwed out in a proximal direction to set the dose and then rotated back to dispense the set dose, while the restrictor element is guided in the thread of the threaded rod and coupled with the operating element so that it rotates and moves back to the initial position as the set dose is being dispensed.

Claims Coverage

The partial content includes two independent claims, each covering a dose limiting injection architecture with a restrictor element coupled to a rotatable operating element and guided on a threaded rod, plus a threaded-sleeve housing insert that enables screwing out to set and rotating back to dispense. Across the independent claims, the inventive features primarily consist of three linked functions: dose limiting by stop engagement, threaded drive dispensing, and coupled return of the restrictor to an initial position during dispensing.

Both independent claims cover a mechanism in which a restrictor element is guided on a threaded rod and coupled to a rotatable operating element, so that dose setting movement drives the restrictor toward a stop to limit maximum total dose and dispensing returns the restrictor to an initial position while the operating element is screwed out proximally to set and rotated back to dispense.

Stated Advantages

Documented Applications

No documented applications found