Injection Device with an End of Dose Feedback Mechanism
First Claim
1. An injection device comprising:
- a housing,a dose setting member being operable to set a desired dose to be injected,a piston rod being adapted to cooperate with a piston so as to cause a set dose to be injected from an ampoule, anda dose delivering mechanism being adapted to operate the piston rod in such a way that a set dose is injected, the dose delivering mechanism further being adapted to provide a non-visual feedback signal to a user only at the end of injection of a set dose,wherein first and second parts of the injection device are adapted to perform a relative rotational movement with respect to each other during injection of a dose, and wherein said relative rotational movement causes at least two parts of the injection device to abut or engage, said abutment or engagement causing the non-visual feedback signal to be generated.
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Accused Products
Abstract
An injection device with a dose delivering mechanism being adapted to provide a non-visual, e.g. audible and/or tactile, feedback signal when a set dose has been at least substantially injected. A first and a second part of the injection device are adapted to perform a relative rotational movement with respect to each other. The relative rotational movement causes at least two parts of the injection device to abut or engage, and this abutment or engagement causes the non-visual feedback signal to be generated. A very distinct and precise feedback is provided as compared to prior art axial solutions because the generation of the feedback signal is initiated by the relative rotational movement. Feedback signal may be generated by a change in a rotational velocity of at least one part, e.g. by changing the pitch of a threaded portion or by engaging a non-rotating part and a rotating part, thereby causing the non-rotating part to start rotating. May alternatively be generated by building up and releasing a tension. The injection device is suitable for injecting insulin.
118 Citations
15 Claims
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1. An injection device comprising:
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a housing, a dose setting member being operable to set a desired dose to be injected, a piston rod being adapted to cooperate with a piston so as to cause a set dose to be injected from an ampoule, and a dose delivering mechanism being adapted to operate the piston rod in such a way that a set dose is injected, the dose delivering mechanism further being adapted to provide a non-visual feedback signal to a user only at the end of injection of a set dose, wherein first and second parts of the injection device are adapted to perform a relative rotational movement with respect to each other during injection of a dose, and wherein said relative rotational movement causes at least two parts of the injection device to abut or engage, said abutment or engagement causing the non-visual feedback signal to be generated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15)
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12. An injection device according to claim, wherein the tension is introduced during injection of a dose.
Specification