Dose setting mechanism and an injection syringe having such a dose setting mechanism
First Claim
1. A drug administration device comprising a housing and a dose setting mechanism, wherein said dose setting mechanism includes:
- a press button (7) connectable with a piston rod (13) for administration of a set dose from a container,a rotatable dose setting element (5) interconnected with said press button (7),a dose administration wheel (11) connected with said piston rod (13), anda coupling ring (12) connected with the dose setting element (5) and the press button (7) such that rotation of the dose setting element and coupling ring in a first rotational direction moves the press button in one direction, and movement of the press button in an opposite direction rotates said dose settings element and coupling ring in a second rotational direction, wherein one of said dose administration wheel (11) and said coupling ring (12) at least partly surrounds the other, said dose administration wheel (11) and said coupling ring (12) being arranged such that rotation of the dose setting element (5) allows the coupling ring (12) to be rotated in either direction in relation to the dose administration wheel (11), while activation of the press button (7), and thereby rotation of the coupling ring (12), causes the dose administration wheel (11) to be rotated.
1 Assignment
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Accused Products
Abstract
A dose setting mechanism for a drug administration device and an injection syringe having such a dose setting mechanism are provided. The injection syringe has a housing accommodating an ampoule (3) containing medicine sufficient for a number of dosed injections, an injection press button (7), a piston rod (13) for co-operation with a piston in the ampoule (3) when injecting, and a dose setting mechanism comprising a rotatable dose setting element (5) interconnected with the press button. The dose setting mechanism further comprises a dose administration wheel (11) connected with the piston rod (13) and a coupling ring (12) connected with the dose setting element (5) and the press button (7). One of the dose administration wheel (11) and the coupling ring (12) at least partly surrounds the other, and the dose administration wheel (11) and the coupling ring (12) are arranged such that rotation of the dose setting element (5) allows the coupling ring (12) to be rotated in either direction in relation to the dose administration wheel (11), while activation of the press button (7), and thereby rotation of the coupling ring (12), causes the dose administration wheel (11) to be rotated.
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Citations
9 Claims
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1. A drug administration device comprising a housing and a dose setting mechanism, wherein said dose setting mechanism includes:
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a press button (7) connectable with a piston rod (13) for administration of a set dose from a container, a rotatable dose setting element (5) interconnected with said press button (7), a dose administration wheel (11) connected with said piston rod (13), and a coupling ring (12) connected with the dose setting element (5) and the press button (7) such that rotation of the dose setting element and coupling ring in a first rotational direction moves the press button in one direction, and movement of the press button in an opposite direction rotates said dose settings element and coupling ring in a second rotational direction, wherein one of said dose administration wheel (11) and said coupling ring (12) at least partly surrounds the other, said dose administration wheel (11) and said coupling ring (12) being arranged such that rotation of the dose setting element (5) allows the coupling ring (12) to be rotated in either direction in relation to the dose administration wheel (11), while activation of the press button (7), and thereby rotation of the coupling ring (12), causes the dose administration wheel (11) to be rotated. - View Dependent Claims (2, 3)
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- 4. An injection syringe (1) comprising a housing accommodating an ampoule (3) containing a piston and medicine sufficient for a number of dosed injections, an injection press button (7), a piston rod (13) for co-operation with the piston in the ampoule (3) when injecting, and a dose setting mechanism comprising a rotatable dose setting element (5) interconnected with said press button (7), characterized in that the dose setting mechanism further comprises a dose administration wheel (11) connected with said piston rod (13) and a coupling ring (12) connected with the dose setting element (5) and the press button (7), one of said dose administration wheel (11) and said coupling ring (12) at least partly surrounding the other, said dose administration wheel (11) and said coupling ring (12) being arranged such that rotation of the dose setting element (5) allows the coupling ring (12) to be rotated in either direction in relation to th(e dose administration wheel (11), while activation of the press button (7), and thereby rotation of the coupling ring (12), causes the dose administration wheel (11) to be rotated.
Specification