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Drug injection device with resettable mechanism allowing piston rod retraction upon drug cartridge change

A drug and cartridge technology, applied in the direction of syringes, drug devices, automatic injectors, etc., can solve the problems of undisclosed replacement of cartridges and reset of piston rods

Active Publication Date: 2017-05-31
SANOFI SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In EP 1 819 382 B1 there is no disclosure of changing cartridges and resetting eg piston rods

Method used

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  • Drug injection device with resettable mechanism allowing piston rod retraction upon drug cartridge change
  • Drug injection device with resettable mechanism allowing piston rod retraction upon drug cartridge change
  • Drug injection device with resettable mechanism allowing piston rod retraction upon drug cartridge change

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0114] figure 1 The drug delivery device is shown in the form of an injection pen. The device has a remote ( figure 1 the left end of the center) and the proximal end ( figure 1 the right end of the middle). exist figure 2 The components of the drug delivery device are shown in . The drug delivery device comprises a body or housing 10, a cartridge holder 20, a lead screw (piston rod) 30, a drive sleeve 40, a nut 50, a dose setting element as a dose indicator (digital sleeve) 60, a button 70 , dial handle or dose selector 80, torsion spring 90, cartridge 100, metering element 110, clutch plate 120, clutch spring 130, support 140, return plate 150 and cartridge holder spring 160. A needle assembly with hub and cover can be provided as an add-on, the needle assembly being replaceable as explained above. All parts are built around image 3 The shown mechanisms have a common main axis I positioned concentrically.

[0115] The housing 10 or body is a generally tubular eleme...

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PUM

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Abstract

The present invention is generally directed to a drug delivery device for selecting and dispensing a number of user variable doses of a medicament. The device comprises a housing (10), a dose setting element (60) rotatable relative to the housing (10) during dose setting and dose dispensing, a drive member (40) coupled to the dose setting member (60) via a clutch (120), and a piston rod (30) coupled to the housing (10) and to the drive member (40). Further, the device further comprises a cartridge holder (20) removably attached to the housing (10) and a reset element (150), which is axially constrained to the dose setting element (60), and at least one spring (130) acting on the reset element (150), such that, if the cartridge holder (20) is detached from the housing (10), the reset element (150) is axially moved relative to the housing (10) into a position in which the dose setting element (60) is rotationally constrained to the housing (10) and the drive member (40) is allowed to rotate relative to the housing (10).

Description

technical field [0001] The present invention generally relates to a drug delivery device for selecting and dispensing a plurality of user variable doses of medicaments and a method of assembling the drug delivery device. Background technique [0002] Pen-type drug delivery devices may be used where regular injections are performed by persons without formal medical training. This may be increasingly common in patients with diabetes, and self-treatment allows such patients to effectively manage their disease. In practice, such drug delivery devices allow the user to individually select and dispense multiple user variable doses of drug. The present invention does not relate to so-called fixed dose devices, which only allow the dispensing of predetermined doses without the possibility to increase or decrease the set dose. [0003] There are basically two types of drug delivery devices: resettable devices (ie, reusable) and non-resettable devices (ie, disposable). For example,...

Claims

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Application Information

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IPC IPC(8): A61M5/20A61M5/24A61M5/315
CPCA61M5/20A61M5/24A61M5/31541A61M5/31543A61M5/31553A61M5/31585A61M5/31593A61M2005/202A61M2005/2407A61M2005/2477A61M2005/3154A61M2205/581A61M2205/582A61M2005/2485A61M2005/3126A61M2205/584
Inventor Z·G·厄德利P·R·德雷珀
Owner SANOFI SA