INJECTION DEVICE HAVING A DOSING ELEMENT AND A PRELOADED DISCHARGE SPRING

摘要

A driving and dosing device for an injection device includes: a housing, a dosing element gripped by a user, an actuating element actuable by the user to discharge the set dose, a propulsion element for acting on a piston to discharge the set dose, a spring configured to act between the propulsion element and an abutment, which is preloaded so as to discharge a maximum dischargeable product quantity in a plurality of individual discharges, a rotation element configured to rotate relative to the housing and a clutch configured for releasably engaging the rotation element. Releasing the clutch permits the rotation element to rotate relative to the housing when the actuating element is actuated, blocks the rotation of the rotation element relative to the housing when the actuating element is released, and by rotation of the rotation element, the spring is permitted to move the propulsion element in the discharge direction.

主权项

1. A driving and dosing device configured to repeatedly set a dose and administer the dose from an injection device for administering a liquid product, the driving and dosing device comprising:
a) a housing; b) a dosing element configured to be gripped by a user and to be rotated relative to the housing for setting the dose to be administered; b) an actuating element configured to be actuated by the user, wherein the actuating element is displaceable relative to the dosing element to discharge the set dose; c) an abutment; d) a propulsion element comprising a distal end configured for acting on a piston of a product container fixed or fixable to the device, wherein the propulsion element is movable relative to the abutment in a discharge direction in order to discharge the set dose; e) a spring configured to act between the propulsion element and the abutment, wherein the spring is preloaded in a delivery state of the device with sufficient energy that said spring can discharge a maximum dischargeable product quantity from the product container in a plurality of individual discharges; f) a rotation element configured to rotate relative to the housing, wherein rotation of the rotation element permits the spring to move the propulsion element in the discharge direction; and g) a clutch configured for releasably engaging the rotation element, wherein the clutch releases the rotation element such that the rotation element rotates relative to the housing when the actuating element is actuated, and blocks the rotation of the rotation element relative to the housing when the actuating element is released.