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Frost protected injection device

  • US 9,616,175 B2
  • Filed: 07/08/2010
  • Issued: 04/11/2017
  • Est. Priority Date: 07/08/2009
  • Status: Active Grant
First Claim
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1. A medical injection device comprising:

  • a housing;

    a variable volume reservoir containing a liquid drug and comprising an outlet and a movable wall;

    an injection mechanism operable to inject a dose of the liquid drug and comprising an actuation member adapted to displace the movable wall in a first direction; and

    a coupling mechanism, wherein the injection device is configured to prevent a movement of the actuation member in a second direction substantially opposite the first direction in response to a subjection of the actuation member to a first force being of a magnitude which is smaller than a threshold value and to allow a reversible movement of the actuation member in the second direction in response to a subjection of the actuation member to a second force from the reservoir acting on the actuation member via the movable wall, the second force being of a magnitude which is equal to or greater than the threshold value.

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