| 摘要 |
<p>For detecting an occlusion in an injection device for injecting automatically a medicament, an injection force is measured (SO), a force offset value is deducted (SO') from measurements of the injection force, and occlusions are detected ( BD) based on the measurements having the force offset value deducted therefrom. For example, the force offset value is determined based on an opening pressure required for opening a pressure valve arranged at an injection outlet of the injection device. The force offset value is further determined based on an estimated friction of a piston arranged in the injection device for generating the injection force an estimated friction of a seal, particularly an X-ring, arranged in the injection device, and/or an estimated measurement error in the force measurements ( Fn). Detecting occlusions based on force measurements having an offset value deducted therefrom makes it possible to reduce incorrect occlusion alarms.</p> |
