Electronically monitored injection device
AssigneeNovo Nordisk A/S
InventorsSøren Kragh Jespersen, Claus Urup Gjødesen, Andre Larsen
Life of this patent
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Abstract
The present invention relates to a medical injection device (1) for use in combination with a medicament filled cartridge (2), the injection device being provided with a spring-assisted injecting mechanism where energy released from the spring moves a plunger (3) of a held cartridge (2). Sensor circuitry is adapted to detect speed related data during injection so at to detect an abnormal speed condition, such as a needle blocking condition, a priming condition or an air purge condition. The invention also relates to a medical injection device comprising sensor circuitry and user communicating means to provide a recommended needle retraction waiting period which is dependent on the speed of injection.
Claims9
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.
Dependencies are inferred from the claim text.