Injection device with an end of dose feedback mechanism
DCFirst Claim
1. An injection device comprising:
- a housing having a longitudinal axis,a dose setting member being operable by a user to set a desired dose of a varying amount to be injected, the desired dose thereby being a set dose,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 the set dose is injected by a mechanically biased mechanism comprising at least one spring and wherein the injection is subsequently performed by releasing the stored energy previously built up in the mechanically biased mechanism and which stored energy will cause the set dose to be injected, the dose delivering mechanism further being adapted to provide an audible feedback signal to a user only at the end of injection of the set dose,wherein first and second parts of the injection device are adapted to perform a relative rotational movement around a longitudinal axis with respect to each other during injection of the set dose, and wherein said relative rotational movement causes at least the first part and the second part of the injection device to abut or engage, said abutment or engagement causing the audible feedback signal to be generated,wherein the audible feedback signal is generated as the first part and the second part of the dose delivering mechanism performing said relative rotational movement are moved against each other, andthe audible feedback signal is generated by releasing a tension which has previously been introduced in a part of the injection device comprising at least one resilient portion of at least one of the first part and the second part performing said relative rotational movement.
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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.
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Citations
9 Claims
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1. An injection device comprising:
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a housing having a longitudinal axis, a dose setting member being operable by a user to set a desired dose of a varying amount to be injected, the desired dose thereby being a set dose, 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 the set dose is injected by a mechanically biased mechanism comprising at least one spring and wherein the injection is subsequently performed by releasing the stored energy previously built up in the mechanically biased mechanism and which stored energy will cause the set dose to be injected, the dose delivering mechanism further being adapted to provide an audible feedback signal to a user only at the end of injection of the set dose, wherein first and second parts of the injection device are adapted to perform a relative rotational movement around a longitudinal axis with respect to each other during injection of the set dose, and wherein said relative rotational movement causes at least the first part and the second part of the injection device to abut or engage, said abutment or engagement causing the audible feedback signal to be generated, wherein the audible feedback signal is generated as the first part and the second part of the dose delivering mechanism performing said relative rotational movement are moved against each other, and the audible feedback signal is generated by releasing a tension which has previously been introduced in a part of the injection device comprising at least one resilient portion of at least one of the first part and the second part performing said relative rotational movement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification