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A torsion spring driven injection device

A torsion spring and injection device technology, applied in the field of torsion spring-driven injection devices, can solve problems such as failure, failure to release the set dose correctly, and injection device jamming

Inactive Publication Date: 2020-03-06
NOVO NORDISK AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] If the teeth are not properly aligned for engagement, the set dose may not be released correctly, or the injection device may jam and malfunction
Furthermore, if there is a torque in one of the parts involved, the parts will exert rotational pressure on each other, which may hinder relative axial movement between the parts involved

Method used

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  • A torsion spring driven injection device
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Examples

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Embodiment Construction

[0078] When the following terms are used as "up" and "down", "right" and "left", "horizontal" and "vertical", "clockwise" and "counter (or counter) clockwise" or similar relative expressions, These refer only to the drawings and not to actual usage. The shown figures are schematic representations, for which reason the arrangement of the different structures as well as their relative dimensions are for illustrative purposes only.

[0079] In this context, it is convenient to define that the term "distal end" in the figures refers to the end of the dose setting and injection mechanism device which is usually coupled to a drug device which further carries the injection needle. cartridge holder, while the term "proximal end" refers to the opposite end away from the cartridge holder and the injection needle, and this proximal end usually carries the dose dial. Distal and proximal refer to the axial direction along the dose setting and injection mechanism, along figure 2 and im...

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PUM

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Abstract

The invention relates to a torsion spring driven injection device for delivering set doses of a liquid drug wherein a torsion spring is strained by rotation of a rotatable dose setting structure and released by proximal movement of a piston rod driver. The dose setting structure is coupled to a drive element which is rotated during dose setting and which drive element is released during dosing tothereby rotate the piston rod driver. The piston rod driver is further coupled to the piston rod to generate a rotation and thus forward movement of the piston rod. The drive element and the piston rod driver are coupled to each other by a toothed engagement which is functional both during dose setting and during dose expelling.

Description

technical field [0001] The present invention relates to a torsion spring driven injection device for delivering a set dose of liquid medicament. In particular, the invention relates to a mechanism by which the torque of the torsion spring is stored, released and transmitted to the axial movement of the piston rod. More particularly, the present invention relates to mechanisms in which torque stored in a torsion spring is released by moving an element, such as a needle shield, etc. in a proximal direction when an injection is performed. Background technique [0002] Generally, the ejection mechanism in an injection device includes a piston rod that moves a rubber plunger forward within a cartridge to express a set amount of liquid drug from the cartridge. The distance the piston rod moves forward during a single injection is set and controlled by the dose setting and injection mechanism. The cartridge is usually fixed in the housing and the piston rod usually has a helical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/315A61M5/20A61M5/32
CPCA61M5/20A61M5/31541A61M5/31553A61M5/31568A61M5/3157A61M5/31575A61M2005/208A61M2005/3267A61M5/31563
Inventor M.J.克里斯坦森B.G.拉尔森C.索伦森K.索嘉尔德
Owner NOVO NORDISK AS
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