Pen type drug injection device with dose limiting nut to prevent setting of a dose higher than the amount of drug remaining

A dose setting and dose technology, applied in the field of injection devices and pen-type drug delivery devices, can solve problems such as difficult actuation

Active Publication Date: 2016-04-13
SANOFI SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the piston rod has a smaller diameter than the driver and the torsion spring, in some cases it may be difficult to limit the actuation of the device and thus withstand relatively high torques via the piston rod

Method used

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  • Pen type drug injection device with dose limiting nut to prevent setting of a dose higher than the amount of drug remaining
  • Pen type drug injection device with dose limiting nut to prevent setting of a dose higher than the amount of drug remaining
  • Pen type drug injection device with dose limiting nut to prevent setting of a dose higher than the amount of drug remaining

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0120] The injection device 1 according to the invention is figure 1 shown in an exploded view. The injection device 1 comprises a cartridge holder 2, a cartridge 3 and a drive mechanism. The drive mechanism comprises an outer housing 4, an inner housing 5, a dose dial sleeve as a dial member 6, a number sleeve as a display member 7, a drive sleeve as a drive member 8, a lead screw 9, a bearing 10, a nut 11. Drive spring 12, return spring 13, dial handle 14, dose button 15 and clutch plate 16. All components are concentrically located about a common main axis of the mechanism. In more detail, the drive member 8 surrounds the lead screw 9, the torsion spring 12 surrounds the drive member 8, the dial member 6 and the inner housing 4 surround the torsion spring 12, the display member 7 surrounds the dial member 6, and the outer housing 4 surrounds the display member 7. Furthermore, the nut 11 and the clutch plate 16 are located between the drive member 8 and the dial member 6...

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PUM

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Abstract

The present invention relates to a pen type drug injection device (1; 101) with drive mechanism, comprises a housing (4, 5; 104, 105), a dose dial member (6; 106), a drive member (8; 108) engaging a lead screw (9; 109), a first clutch (18; 118) rotationally coupling the drive member (8; 108) and the housing in a coupled state and allowing relative rotation between the drive member and the housing in a de-coupled state, a second clutch (19; 119) rotationally coupling the drive member and the dial member in a coupled state and allowing relative rotation between the drive member and the dial member in a de-coupled state, and a nut (11; 111) coaxially arranged between the drive and the dial member and splined or keyed to the drive as well as threadedly engaged to the dial member, such that it moves axially on the drive member during dose setting but not during dose dispensing, and such that it eventually abuts an end stop on one of the drive or dial member, thereby limiting movement of the nut and preventing setting of a dose larger than the amount of drug remaining in the cartridge.

Description

technical field [0001] The present invention relates to a drive mechanism suitable for use in injection devices, especially pen-type drug delivery devices. The mechanism includes: a housing; a dial member; a drive member that engages the lead screw; a first clutch that rotationally couples the drive member and the housing in an engaged state and allows communication between the drive member and the housing in a disengaged state. Relative rotation between; a second clutch, which in the connected state connects the drive member and the dial member in the direction of rotation, and allows relative rotation between the drive member and the dial member in the disconnected state; the nut; and the end stop, It limits the movement of the nut. Furthermore, the invention relates to an injection device comprising such a drive mechanism and a cartridge containing a medicament. Background technique [0002] An injection device as defined above is known, for example from EP1974761B1, in...

Claims

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Application Information

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IPC IPC(8): A61M5/315A61M5/20A61M5/24
CPCA61M5/20A61M5/24A61M5/31528A61M5/31535A61M5/31541A61M5/31553A61M5/31585A61M5/31586A61M5/31593A61M2005/202A61M2005/2073A61M2205/581A61M2205/582
Inventor D·A·普伦特里S·L·比尔顿
Owner SANOFI SA
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