Spring force assembly for biasing or actuating stoppers of syringes, injection pen cartridges and the like
AssigneeRoche Diabetes Care, Inc.
InventorsHanspeter Niklaus, Florian Schaad, David Teutsch
Life of this patent
Estimating the term…
Abstract
A spring force assembly for biasing a displaceable stopper of a liquid medicament cartridge including a spring element arranged along a longitudinal axis, with brace elements and coupling elements, with the coupling elements restricting the distance between the brace elements which also restricts the possible expansion of the spring element.
Claims9
An infusion pump device, comprising a spring force unit for biasing a displaceable stopper of a liquid medicine cartridge, wherein the spring force unit is a spring force assembly comprising a spring element arranged along a longitudinal axis, comprising:
- a first brace element is arranged on and supports one longitudinal end of the spring element;
- a second brace element is arranged on the other longitudinal end of the spring element;
- a first coupling element attached to the first brace element and aligned to the longitudinal axis;
- and
- a second coupling element attached permanently to the second brace element and aligned to the longitudinal axis;
- and
- wherein the first coupling element and the second coupling element are each single-piece elements operationally coupled to each other in such a way that they restrict the distance between the first brace element and the second brace element to a certain maximum value, thereby also restricting the possible expansion of the spring element.
Dependencies are inferred from the claim text.