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injection device

A technology for injection devices and syringes, which is applied in the directions of syringes, automatic injectors, ampoule syringes, etc., can solve the problem that automatic assembly devices cannot be assembled in the same way.

Active Publication Date: 2016-06-29
OWEN MUMFORD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, automated assembly devices have so far not been able to assemble in the same way

Method used

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Examples

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Embodiment Construction

[0038] The automatic pen injector of the first embodiment is designed to have a low number of parts and is specifically adapted for easy automatic or semi-automatic assembly. refer to figure 1 and Figure 8(b), the assembled device includes a drive housing 10 that includes a forward drive housing portion 10 1 and drive the housing part 10 backwards 2 , and includes a drive mechanism generally designated 12. Connected to the front end 10 of the drive housing is a cartridge housing 14 which contains a cartridge of medicament. A known form of double-ended nib (not shown) can be screwed onto the threaded portion 16 at the front of the cartridge housing. A cover 18 can slide over the cartridge housing to protect the cartridge and its contents prior to use.

[0039] The operation of the device is essentially as described in our earlier US5104380. Thus, by twisting the dose setting knob 22 to the desired dose size scale, the ratchet drive shaft 20 is rotated out of the rest posit...

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PUM

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Abstract

An injection device includes a housing (40) for containing a syringe or cartridge (14) of medicament; a rotary drive shaft (20) for being rotated by an adjustable preset amount to cause expression of a corresponding amount of medicament from the syringe or cartridge; a torsion drive spring (24) anchored at one end region relative to the drive shaft (20) and, at its other end region being secured to a fitting (44) adapted to non-rotatably engage a seat (48, 50) on the housing.

Description

technical field [0001] The present invention relates to injection devices and methods of assembly thereof. In particular, but not exclusively, the present invention relates to automatic or semi-automatic pen injectors in which the user dials the dose by turning the ratchet dose setting knob the desired angular amount, thereby tensioning the torsion spring. When the ratchet is released, the consequent rotation causes the preset amount of dose to be squeezed out. Typical examples of such devices include our widely used Pen injectors and other types of injectors described in US5104380. Background technique [0002] When assembling such a device, the introduction, alignment and securing of the torsion spring within the housing is usually done by hand, as skill is required to achieve proper assembly. As numbers grow, it is not cost effective to assemble such devices by hand, and thus requires some form of automated assembly. However, automatic assembly devices have hitherto ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61M5/20A61M5/315
CPCA61M5/31583A61M5/20A61M5/24A61M5/31553A61M5/3156A61M2005/2407A61M2005/2488A61M2005/2492A61M2207/00Y10T29/49826
Inventor 马克·伊顿托比·柯维
Owner OWEN MUMFORD
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