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auto injector

A technology for automatic injectors and injection barrels, applied in the direction of automatic injectors, syringes, hypodermic injection devices, etc., can solve problems such as trembling or trembling, problems with pressing the plunger, inconvenience, etc.

Active Publication Date: 2021-05-18
SANOFI AVENTIS DEUT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, the force required to depress the plunger can be problematic for elderly users or those with dexterity issues, which can cause problems during alignment or injection and / or when administering a dose of liquid medication trembling or trembling
In addition, the extension of the button or plunger of the manual device may be too large
Therefore, reaching the fully extended button can be inconvenient for the user

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] An autoinjector with a plunger arrangement is provided. The plunger arrangement comprises: a plunger unit between the plunger of the syringe and the proximal end of the housing of the autoinjector; and a screw element. Both the plunger unit and the screw element are provided with threaded surfaces such that in an initial state the screw element is received in the inner cavity of the plunger unit via the thread arrangement.

[0029] The screw element is fixedly attached to a tensioned coil spring which, when released, will rotate in the first direction and cause the screw element to also rotate in the first direction. By means of the threaded arrangement of the screw element and the plunger unit, the plunger unit translates towards the distal end of the housing and pushes the plunger of the syringe to displace the liquid drug contained in the syringe. The configuration of the auto-injector as described allows for increased compactness and portability.

[0030] A drug d...

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PUM

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Abstract

An autoinjector for delivering a liquid medicament, the autoinjector comprising: a housing arranged to receive a syringe having a piston for sealing the syringe and displacing the medicament, the housing having a proximal end and the distal end intended to be applied against the injection site; a plunger unit disposed between the piston and the proximal end of the housing, the plunger unit comprising a threaded inner surface for receiving and engaging a screw element and a tensioned elastic element fixed to the screw element, the elastic element and the screw element being fixed against rotation in an initial state, wherein when the elastic element is rotationally released, the screw Rotation of the element in a first direction translates the plunger unit towards the distal end of the housing and thereby pushes the piston towards the distal end of the housing to displace the drug.

Description

technical field [0001] The present invention relates to an autoinjector for delivering liquid medicine to a user. Background technique [0002] Current therapies delivered by self-administered injections include drugs for diabetes (insulin and the new GLP-A class of drugs), migraine drugs, hormone therapy, anticoagulants, and others. Administering an injection is a process that presents a variety of psychological and physical risks and challenges to users and health care professionals. [0003] Conventional injection devices are generally divided into two categories, namely manual devices and auto-injectors. In traditional manual devices, the user must provide force to drive the liquid drug out of the device, for example by depressing a plunger. There are many inherent disadvantages for users of manual devices. For example, less than a full dose of liquid medication may be delivered if the user stops depressing the plunger. Additionally, the force required to depress the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61M5/20A61M5/315
CPCA61M5/31585A61M2205/8281A61M5/2033A61M5/19A61M5/31505A61M5/31515
Inventor S·温德兰M·哈姆斯
Owner SANOFI AVENTIS DEUT GMBH