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An injection device with needle cleaning

A technology for injection devices, needles, applied in the field of cleaning components in clean rooms, which can solve the problems of long distances, wrong dosing, etc.

Inactive Publication Date: 2020-07-03
NOVO NORDISK AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the pressure built up inside the liquid system creates a resultant force on the movable plunger which can move the movable plunger a longer distance than is actually possible, this leads to overfilling and thus overpressurization of the clean room
This overfilling and overpressurization of the clean room is highly undesirable as it creates an overpressure throughout the fluid system which can lead to incorrect dosing

Method used

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  • An injection device with needle cleaning
  • An injection device with needle cleaning
  • An injection device with needle cleaning

Examples

Experimental program
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Embodiment Construction

[0071] When the following terms are used as "up" and "down", "right" and "left", "horizontal" and "vertical", "clockwise" and "counter (or counter) clockwise" or similar relative expressions, These refer only to the drawings and not to actual usage. The shown figures are schematic representations, for which reason the arrangement of the different structures as well as their relative dimensions are for illustrative purposes only.

[0072] It is appropriate in this context to define that the term "distal" in the figures means the end of the injection device that is usually adjoining or directed towards the user's skin during injection, while the term "proximal" means facing away from the skin during injection. the opposite end. The distal end of the injection usually carries the needle cannula, while the proximal end is usually provided with an operating button to set the size of the dose to be injected. Distal and proximal refer to along the figure 1 The imaginary centerline...

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PUM

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Abstract

The invention relates to a medical injection device having a needle cannula for multiple uses and which needle cannula is cleaned between subsequent injections. The needle cannula is preferably cleaned at the distal tip in a cleaning assembly having a hollow cleaning chamber with a variable volume. The distal tip of the needle cannula is maintained inside the cleaning chamber between subsequent injections. The cleaning chamber is defined by an inner surface, a distal seal and a proximal seal. In order to increase the volume of the cleaning chamber during filling of the cleaning chamber one ofthe seals is formed as a movable plunger which is movable in one direction to expand the volume of the cleaning chamber. To release the movable plunger from the inner surface of the hollow cleaning chamber in order to commence the filling of the cleaning chamber, the movable plunger and the inner wall surface of the hollow cleaning chamber are rotatable in relation to each other during filling ofthe cleaning chamber.

Description

technical field [0001] The present invention relates to an injection device having a cleaning container for cleaning the distal tip of a needle cannula between subsequent injections. The cleaning container is preferably carried by a telescopically movable needle shield covering the needle cannula between injections. In one example, the invention relates to an injection device wherein the clean container is filled with the same preservative-containing liquid drug as is present in the cartridge, preferably directly from the cartridge. [0002] The invention also relates to a cleaning assembly for an injection device, and more particularly to a cleaning assembly having a cleaning chamber with a variable volume. Background technique [0003] A prefilled disposable injection device for repeated use is disclosed in European Patent No. 2,911,724 B1. In this prior art document, the same needle cannula is used for multiple injections and the distal tip of the needle cannula is clea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/00A61M5/315A61M5/32A61B5/15
CPCA61M5/001A61M5/2466A61M5/31573A61M5/31585A61M5/3243A61M2005/247A61M2005/3267A61B5/150312B08B9/023
Inventor S.M.派德森B.拉德默
Owner NOVO NORDISK AS
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