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A drive mechanism for an injection device and a method of assembling an injection device incorporating such drive mechanism

A technology of driving mechanism and injection device, which is applied in the direction of syringes, automatic injectors, hypodermic injection devices, etc., and can solve problems such as technical complexity

Inactive Publication Date: 2014-07-30
NOVO NORDISK AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Taking into account the problems of technical complexity of the prior art identified above, the object of the present invention is to provide a spring-assisted injection device which allows a simplified and cost-effective manufacture

Method used

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  • A drive mechanism for an injection device and a method of assembling an injection device incorporating such drive mechanism
  • A drive mechanism for an injection device and a method of assembling an injection device incorporating such drive mechanism
  • A drive mechanism for an injection device and a method of assembling an injection device incorporating such drive mechanism

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Embodiment Construction

[0089] Figures 1 to 5 show an injection device 1 comprising a drive mechanism, ie a dose setting mechanism for setting a dose of a medicament, and a dose injection mechanism for injecting a previously set dose. This drive mechanism is suitable for use with about Image 6 used with the sensing systems described in to 12. The device shown in Figures 1-5 generally corresponds to the embodiment shown in Figures 11-15 of WO 2008 / 116766 A1, which is hereby incorporated by reference.

[0090] The drive mechanism comprised in the injection device 1 is adapted to operate in two mechanical modes of operation, defined respectively as a dose setting mode and an administration mode. In dose setting mode, dose setting may be performed by adjusting up and down a manually operable dose setting component. In this mode, the piston rod of the device remains stationary so that the dose is not expelled. In the administration mode, the already set dose is prevented from being changed, while the ...

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Abstract

The present invention relates to a drive mechanism for a spring assisted injection device configured for setting and expelling set doses of a drug. The drive mechanism comprises an assembly provided by a rotatable piston driver (6), a rotatable counter-element (15) and a spring device (19) tensioned between the piston driver (6) and the counter-element (15). During dose setting and during dose expelling the piston driver (6) and the counter-element (15) move relatively along an axis. A releasable interlock (6c, 15d) is provided for maintaining the piston driver (6) and the counter-element (15) in a fixed relative axial condition wherein the spring device (19) is in a tensioned state. The interlock provides for a simplified manufacturing process. The invention also relates to a method of assembling an injection device.

Description

technical field [0001] The present invention relates to medical injection devices suitable for injecting proportional doses of medicaments. More particularly, the present invention relates to drive mechanisms for medical injection devices incorporating spring assisted dose delivery and methods of manufacture thereof. [0002] In particular, the invention provides improvements in manufacturing capabilities and assembly operations during the manufacture of spring-assisted injection devices. Background technique [0003] In the disclosure of the present invention, most reference is made to the treatment of diabetes by injection or infusion of insulin, however, this is only the preferred use of the present invention. [0004] In order to allow the patient to administer an appropriate dose of a medicament, various mechanical injection devices have been proposed, such as the device shown in WO 01 / 95959. Such an injection device facilitates easy and safe dose setting by means of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/20A61M5/315
CPCA61M5/20A61M5/31536A61M5/31553A61M5/31583A61M5/31593Y10T29/49405F04B9/02
Inventor A.马德森B.P.S.佩德森C.S.安德森
Owner NOVO NORDISK AS