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Dial-Down Mechanism for Wind-Up Pen

  • US 20150148750A1
  • Filed: 03/15/2013
  • Published: 05/28/2015
  • Est. Priority Date: 05/31/2012
  • Status: Active Grant
First Claim
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1. A torsion spring driven injection device having a dial-down mechanism for dialling down a selected dose size, comprising a torsion spring which is strained when setting a dose by rotating a proximally located dose setting button relatively to a housing in a first direction and unstrained when rotating the same dose setting button in a second direction opposite the first direction, the dial-down mechanism further comprising:

  • a fixation element coupled to the housing and having a toothing,a ratchet element having at least one ratchet arm engaging the fixation element and which ratchet element is operational coupled to the dose setting button, andwherein the at least one ratchet arm engages the toothing of the fixation element and is shaped such that the ratchet element is prevented from rotating relatively to fixation element in the second direction when the ratchet arm engages the toothing of the fixation element,and wherein the dose setting button directly engages the at least one ratchet arm when the dose setting button is rotated in the second direction to thereby release the at least one ratchet arm from the toothing of the fixation element and allow the ratchet element to rotate relatively to the fixation element in the second direction under influence of the torsion spring.

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