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Injection pen assembly

A technology of injection pen and sub-assembly, applied in the field of injection pen, can solve problems such as pen discarding

Active Publication Date: 2021-08-17
榭利工程塑料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pen can be used to deliver a single dose or multiple doses, but is discarded when the cartridge is empty, or when less than a predetermined minimum dose remains

Method used

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  • Injection pen assembly
  • Injection pen assembly
  • Injection pen assembly

Examples

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Embodiment Construction

[0021] figure 1 The assembled injection pen according to the invention is shown in longitudinal section. At the distal end of the pen is a cartridge housing 2 which contains a cartridge 4 . A piston 6 is located inside the cartridge 4 and can be pushed forward to remove a dose of drug from the cartridge 4 . The cartridge housing 2 includes threads 8 or other suitable means for connecting a hypodermic needle (not shown) through which a dose of drug can be delivered into the skin of a patient or other recipient.

[0022] At the proximal end of the injection pen is a dose selector housing 10 . The dose selector housing 10 includes a dose selector 12 for setting and delivering multiple doses of medication from the pen. The dose selector 12 is retracted in the proximal direction by a distance which determines the dose to be set. Such as figure 2 As shown, in the illustrated embodiment of the invention, the dose selector housing 10 has internal threads 14 to guide the movement...

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Abstract

An injection pen comprises a cartridge 2, a dose selector housing 10 and a nut 18 for coupling the two housings 2, 10 together. The dose selector housing 10 defines an intermediate axial position in which the nut 18 may be temporarily retained in the dose selector housing 10 to form a subassembly suitable for transport to different positions. During the final assembly of the injection pen, the cartridge 2 is securely engaged with the nut 18 and moves the nut 18 from the intermediate axial position to the final axial position.

Description

technical field [0001] The present invention relates to an injection pen comprising a cartridge and including one or more doses of drug for selection and delivery from the cartridge through a hypodermic needle. In particular the invention relates to a method and coupling by which the dose selector housing and the cartridge housing of such a pen can be assembled and fastened together for ease of manufacture and transport. Background technique [0002] Typically injection pens are assembled from two main components. The first part is a cartridge housing containing a cartridge from which a desired dose of drug can be expelled by driving forward a piston located within the cartridge. The cartridge housing also includes a connector for a hypodermic needle through which the drug may be delivered from the cartridge to the recipient. Cartridges may contain a single measured dose of drug, but more commonly, the cartridge contains enough to deliver multiple doses. [0003] The seco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/24A61M5/315
CPCA61M5/24A61M5/31533A61M2005/2407A61M2005/2492A61M5/31585A61M2207/10A61M5/31551A61M2207/00
Inventor 斯蒂芬·诺尔斯西蒙·科林斯
Owner 榭利工程塑料有限公司
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