Propelling device for a piston in a container containing a liquid medicament
AssigneeDisetronic Licensing AG
InventorsDaniel Peter, Beat Kindler
Life of this patent
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Abstract
An apparatus for administering a substance, including a housing, a piston, a container and a propelling device, the propelling device including a base element, a first shifting stage shiftable relative to the base element, and a second shifting stage shiftable relative to the base element and to the first shifting stage and slaving the first shifting stage, wherein the propelling device, container and piston are operably coupled to the housing and the first shifting stage is in contact with the piston.
Claims26
An apparatus for administering a liquid medicament, comprising a housing, a piston, a container and a propelling device, said propelling device comprising:
- (a) abase element;
- (b) an axially fixed drive member, the drive member being rotatively mounted in the base element;
- (c) a first shifting stage, the first shifting stage being shiftable relative to said base element, wherein said first shifting stage, on shifting, advancing said piston in said container resulting in said liquid medicament being dispensed from said container in a metered manner;
- and
- (d) a second shifting stage, the second shifting stage being shiftable relative to the drive member wherein the second shifting stage slaves the first shifting stage, thereby forming a first spindle drive;
- wherein the first and said second shifting stages, when seen in said advance direction of said piston, overlap at least in part, the first and second shifting stages together forming a first spindle drive, a rotational movement of which causes the first shifting stage to shift and wherein, the container being mounted in the housing such that the container is prevented from shifting, the piston being held in said container and said first shifting stage being connected to said piston only by exerting contact pressure on said piston.
An apparatus for administering a substance, comprising a housing, a piston, a container and a propelling device, the propelling device comprising:
- a base element;
- a first shifting stage shiftable relative to said base element;
- and
- a second shifting stage shiftable relative to said base element and to said first shifting stage, the first and second shifting stages together forming a first spindle drive, rotational movement of which causes the first shifting stage to shift, a portion of the first shifting stage being in contact with the piston;
- wherein said propelling device and the container and piston are operably coupled to the housing, the container being mounted in the housing such that the container is prevented from shifting, wherein the propelling device and the container being separately accommodated in the housing whereby either the container, the propelling device or both can be exchanged.
An apparatus for administering a liquid medicament, said apparatus comprising:
- a housing;
- a reservoir for the liquid medicament;
- a piston which, by advancing, dispenses the liquid medicament from the reservoir in a metered manner;
- and
- a propelling device, comprising:
- a shifting stage shiftable relative to the housing and advancing, on shifting, the piston in the container, resulting in liquid medicament being dispensed from the container in a metered manner, and comprising a thread;
- a drive member, rotationally mounted by the housing and comprising a thread;
- and
- a threaded sleeve shiftable relative to the housing as well as relative to the shifting stage in the advance direction of the piston and slaving the shifting stage in its shifting movement in the advance direction of the piston, and comprising an inner thread and an outer thread, one of which is in a first threaded engagement with the thread of the shifting stage and the other of which is in a second threaded engagement with the thread of the drive member, wherein the drive member is a drive sleeve surrounding the threaded sleeve and its thread is an inner thread in the second threaded engagement with the outer thread, and wherein the threaded sleeve surrounds the shifting stage and its inner thread is in the first threaded engagement with the thread of the shifting stage.
Dependencies are inferred from the claim text.