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 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 the 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 means of a mechanically biased mechanism comprising at least one spring, the dose delivering mechanism further being adapted to provide a distinct 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 a dose, and wherein said relative rotational movement causes at least the first and the second parts of the injection device to abut or engage, said abutment or engagement causing the audible feedback signal to be generated.
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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
17 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 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 the 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 means of a mechanically biased mechanism comprising at least one spring, the dose delivering mechanism further being adapted to provide a distinct 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 a dose, and wherein said relative rotational movement causes at least the first and the second parts of the injection device to abut or engage, said abutment or engagement causing the audible feedback signal to be generated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An injection device comprising:
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a housing having a longitudinal axis, a dose setting member being operable to set a desired dose to be injected, a piston rod being configured to cooperate with a piston so as to cause a set dose to be injected from an ampoule, and a dose delivering mechanism being configured to operate the piston rod in such a way that a set dose is injected, wherein the dose delivering mechanism further is configured to provide an audible 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 arranged and configured to perform a relative rotational movement around a longitudinal axis with respect to each other during injection of a dose, wherein said relative rotational motion is performed in such a manner that one of the first and second parts performs a helical motion accompanying a displacement in the longitudinal direction of the injection device, 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 audible feedback signal to be generated. - View Dependent Claims (13, 14)
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15. 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 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 the 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 means of a mechanically biased mechanism comprising at least one spring, the dose delivering mechanism further being adapted to provide a distinct 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 a dose, and wherein said relative rotational movement between the first and the second parts causes at least the first and the second parts of the injection device to abut or engage, said abutment or engagement of the first and second parts causing the audible feedback signal to be generated.
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16. 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 to be injected, the desired dose thereby being a set dose, wherein the dose setting member is rotatable about a longitudinal axis, a piston rod being adapted to cooperate with a piston so as to cause the 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 means of a mechanically biased mechanism comprising at least one spring, the dose delivering mechanism further being adapted to provide a distinct 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 a dose, wherein the rotation is about the longitudinal axis and wherein said relative rotational movement between the first and the second parts causes at least the first and the second parts of the injection device to abut or engage during the final portion of an injection, said abutment or engagement of the first and second parts causing the audible feedback signal to be generated. - View Dependent Claims (17)
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Specification