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A hypocycloid end-of-content mechanism

A liquid medicine, torsion spring technology, used in hypodermic injection devices, automatic injectors, syringes, etc.

Inactive Publication Date: 2018-09-28
NOVO NORDISK AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] A disadvantage of all these known content emptying mechanisms is that they either require a considerable net axial length of the injection device due to the axially working elements, or a relatively large diameter in order to carry figure 2 spiral orbit in

Method used

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  • A hypocycloid end-of-content mechanism
  • A hypocycloid end-of-content mechanism
  • A hypocycloid end-of-content mechanism

Examples

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example 2

[0157] Figure 7 to Figure 12 A second embodiment is disclosed in which like construction elements are numbered with the same reference numerals but preceded by a "1", in which embodiment the piston rod is henceforth numbered "175".

[0158] The spring motor disclosed herein operates in the same manner as the spring motor of the first embodiment; however, as will be explained, the EoC system is different.

[0159] like Figure 8 As disclosed in, the EoC system mainly consists of three parts. These parts are: Ratchet element 140 ( Figure 9 ), disc-shaped EoC element 180 ( Figure 12 ) and spring base 120.

[0160] Figure 12 The cycloidal disk EoC element 180 of the second embodiment is disclosed in detail. As in the first embodiment, there is an axially extending first protrusion 184 on the distal surface. On the proximal surface, there is provided a second protrusion 185 which also extends axially. Furthermore, the central opening 181 has an oval shape so that the di...

example 3

[0169] exist Figure 13 to Figure 17b In the third embodiment disclosed in , the spring motor operates as in the first two embodiments. The housing 210 carries a nut member 230 distally and a spring base 220 proximally. The torsion spring S1 is contained between the housing 210 and the drive tube 250 . A release clutch 260 is coupled to drive tube 250 and is axially movable relative to drive tube 250 . Between injections, the release clutch 260 is urged in the distal direction by the compression spring S2 so that the release clutch 260 is disengaged from the piston rod guide 270 in this first position, allowing the piston rod guide 270 to be independent of the release clutch 260 rotations. At the same time, the release clutch 260 is coupled with the rotatable dose setting element 240 for simultaneous rotation with the rotatable dose setting element 240 for setting a dose.

[0170] In the second position, the release clutch 260 is disengaged from the rotatable dose setting ...

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Abstract

The invention relates to a torsion spring driven injection device for delivering individually set doses of a liquid drug wherein a torsion spring is strained by rotation of a rotatable dose setting element and released by axial movement of a clutch which couples the dose setting element with the drive tube and the drive tube with a piston rod guide driving the piston rod. When straining the torsion spring the clutch is decoupled from a piston rod guide such that the piston rod guide is able to rotate independently and coupled to the dose setting element. During dose expelling the clutch is moved into engagement with the piston rod guide and out of engagement with the dose setting element such that the piston rod guide rotates with the clutch under influence of the torsion spring. The invention further relates to a non-axial movable End-of-Content mechanism preventing the user from setting a dose larger than the content of the injectable liquid drug remaining in the cartridge of the injection device.

Description

technical field [0001] The present invention relates to a torsion spring driven injection device for individually delivering set doses of a liquid drug. In particular, the invention relates to a mechanism by which the torque of a torsion spring is released and transmitted to the axial movement of the piston rod. [0002] The present invention also relates to a hypocycloidal content emptying mechanism for a medical injection device for injecting liquid medicine, and more particularly to a hypocycloidal content emptying mechanism for a prefilled torsion spring driven injection device. empty body. Background technique [0003] International patent application WO 2014 / 060369 discloses an example of a torsion spring driven injection device for delivering individually set doses of liquid medicine. In this known injection device, a torsion spring is tensioned when the dose is set and is released to drive the piston rod forwards to expel the set dose. The torque held in the torsi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/315A61M5/20
CPCA61M5/31553A61M5/31568A61M5/31591A61M2005/2013A61M5/31541
Inventor S.M.佩德森S.勒维格
Owner NOVO NORDISK AS