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Injection device with automatic needle retraction

A technology of injection device and needle seat, applied in the direction of automatic injector, syringe, ampoule syringe, etc., which can solve the problem that the needle assembly cannot be reused

Active Publication Date: 2020-07-28
NOVO NORDISK AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

WO 2003 / 045480 discloses a safety needle assembly in which an axially movable shield is locked after one injection so that the needle assembly cannot be reused

Method used

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  • Injection device with automatic needle retraction
  • Injection device with automatic needle retraction
  • Injection device with automatic needle retraction

Examples

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Embodiment Construction

[0060] When using terms such as "upper" and "lower", "right" and "left", "horizontal" and "vertical", "clockwise" and "counterclockwise" or similar relative expressions, they Refers only to the accompanying drawings and not to the actual situation in use. The shown figures are schematic representations, for which reason the configuration of the different structures as well as their relative dimensions are for illustrative purposes only.

[0061] In this context, it is convenient to define that the term "distal end" in the figures means the end of the needle cannula to be inserted into the user's skin, while the term "proximal end" means the end pointing away from the user during injection. opposite ends.

[0062] In addition, if image 3 As indicated in , axis "X" is the longitudinal center axis of the injection device defining the axial direction of the injection device.

[0063] Figure 1 to Figure 15 Injection devices shown in include:

[0064] • Housing 1 with distal ...

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Abstract

The present invention relates to an injection device for delivering a set dose of liquid medicament to a user. The injection device has a graduated cylinder for displaying the set dose, which is guided helically in the housing. Thus, the scale drum is rotatable relative to the housing between a zero position and a set position for displaying the set dose. In addition, the needle cannula fixed to the needle hub is installed in an axially movable manner. The axial movement of the needle seat is produced by a spring. A blocking mechanism interacting between the scale cylinder and the needle hub controls the axial movement of the needle hub such that the needle cannula is automatically retracted from the user's skin in response to the scale cylinder reaching the zero position.

Description

technical field [0001] The present invention relates to injection devices with automatic retraction of the needle cannula after injection. The invention relates in particular to such injection devices in which the tip of the needle cannula is automatically removed from the user's skin just before the entire dose has been delivered. Background technique [0002] Shielded needle assemblies are well known. WO 2003 / 045480 discloses a safety needle assembly in which an axially movable shield is locked after one injection so that the needle assembly cannot be reused. [0003] WO 2008 / 077706 discloses a similar construction in which a telescoping shield is prevented from moving axially when the needle assembly is removed from the injection device. However, each time the needle assembly is mounted on the injection device, the shield is unlocked. Contents of the invention [0004] It is an object of the present invention to provide an injection device in which the flow through t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61M5/20A61M5/32
CPCA61M5/20A61M5/326A61M2005/206A61M2005/3267A61M5/2466A61M5/31536A61M5/31551A61M5/31581A61M5/3204A61M5/3293A61M2005/2444A61M2005/3118A61M2005/3126
Inventor H.本格特斯森R.卡罗里
Owner NOVO NORDISK AS
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