Patent ID: 8708957
Filing Date: 2014-04-29
Classification: A61M

Abstract:
1. A medical injection device for use in combination with a medicament filled cartridge, the injection device being a manual injection device not incorporating an electric motor, the injection device being adapted for repetitive injection of individually set or fixed doses of a medicament from a held cartridge, the injection device comprising: a dose setting mechanism operable during a dose setting operation for selecting a size of a dose to be administered, a spring means configured to accumulate energy during the dose setting operation, a drive member advanceable to move a plunger of a held cartridge towards the expelling end of the cartridge, said drive member being forced during injection by the spring means when energy previously stored in said spring means is released, a dose delivery actuator for triggering release of energy from the spring means, a sensor adapted to detect positional information related to the drive member or to a component associated with the drive member, and a circuit communicating with the sensor to process signals sensed by the sensor, wherein the circuit determines speed data of the drive member from signals sensed by the sensor, compares the speed data with pre-defined speed data and performs a control action if the speed as sensed during injection reaches an abnormal speed condition.