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Drive mechanism for injection device

A technology of driving mechanism and injection device, applied in the directions of syringes, auto-injectors, hypodermic injection devices, etc., can solve problems such as piston rod deflection, inaccurate thread shape, and piston rod deflection.

Inactive Publication Date: 2016-06-29
NOVO NORDISK AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Parasitic loads can also occur in threads
[0008] Furthermore, the thread profile on the piston rod or inside the nut part (or both) can be imprecise, which can also cause deflection of the piston rod
[0009] Sometimes the nut part is molded integrally with the housing, however in this case tolerances may also allow deflection of the piston rod during its axial movement

Method used

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  • Drive mechanism for injection device
  • Drive mechanism for injection device
  • Drive mechanism for injection device

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0061] When relative expressions such as "upper" and "lower", "right" and "left", "horizontal" and "vertical", "clockwise" and "counterclockwise" or similar relative expressions are used below, these are only references Drawings are included, not actual usage. The shown figures are schematic diagrams, the arrangement of the different structures as well as their relative dimensions are for illustrative purposes only, for reasons of illustration.

[0062] In this case it may be convenient to define the word "distal" in the figures to mean the end of the injection device that normally carries the needle, and the word "proximal" to mean remote from the needle and used to carry the needle. Opposite end of dose dial button.

[0063] figure 1 A schematic diagram of the prior art is disclosed. The nut part 1 is usually non-rotatably connected to the housing of the injection device so that it cannot move in any direction. Alternatively, the nut part 1 is integrally molded with the ...

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PUM

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Abstract

The invention relates to a drive mechanism for a medical injection device in which a piston rod (10) has a threaded outer surface and a not circular cross-section and engages a nut assembly (2, 102, 202) having either an internal thread (41, 141, 241 ) mating the outer thread (11) of the piston rod (10), or a shape mating the non-circular cross section of the piston rod (10). The nut assembly (2) comprises a first part (30, 130, 230) and a second part (40, 140, 240), which are connected by a hinge allowing the first part (30, 130, 230) and the second part (40, 140, 240) to tilt relatively to each other in a non-axial plane.

Description

technical field [0001] The present invention relates to an injection device for extruding a dose of liquid medicine. The present invention relates in particular to a drive mechanism for such an injection device, and more particularly to such a drive mechanism comprising a nut and threaded connection for advancing the piston rod. Background technique [0002] Injection devices typically have a housing that stores a cartridge containing liquid medication to be injected. Liquid drug is forced out of the cartridge through the injection needle by moving the plunger inside the cartridge. This forward movement is usually accomplished by a piston rod against the plunger, which is moved axially by a drive mechanism. [0003] An example of such an injection device is disclosed in WO99 / 38554 (with particular reference to Figures 15-17, which is currently sold under the trade name Flexpen® by Novo Nordisk A / S) and US2011 / 0054412. The disclosed dosing mechanism includes a piston rod h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/315A61M5/20
CPCA61M5/20A61M5/31583A61M5/31501A61M5/31543A61M5/315A61M2039/1033A61M39/1055A61M2005/31518A61M5/31513A61M5/31586
Inventor L.希格森I.格胡拉姆J.B.诺加亚尔德K.汉森C.U.格乔德森C.S.安德森A.M.拉森
Owner NOVO NORDISK AS