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Publication Number
US-8512296-B2
Publication Date
2013-08-20
Expiration Date
Abstract
An injection device (30) features a housing (42, 52) for reception of a container (34) having a fluid (32) to be injected, a first element (94) for ejecting injection fluid (32) from such a container (34), and said first element (94) has an external thread (92). A metering element (66, 88) has an internal thread (90) that is in engagement with the external thread (92) of the first element (94), and said metering element (66) is rotatable, together with the first element (94), for preselection of a desired injection dose. A coupling arrangement (K1) serves, during an injection operation, to create a nonrotatable connection between the first element (94) and the housing (42, 52) and thereby to block, during an injection operation, a rotation of the first element (94) relative to the housing (42, 52) but to enable a rotation of the metering element (66, 88) relative to the housing (42, 52).
Core Innovation
The invention relates to an injection device in which a container having injection fluid is connectable to a housing. A first element for ejecting injection fluid from the container is shaped with an external thread, and a metering element is arranged rotatably relative to the housing with an internal thread engaged with the external thread of the first element. The metering element is rotatable, together with the first element relative to the housing, for preselection of an injection dose.
During an injection operation, a coupling arrangement blocks a rotation of the first element relative to the housing but enables a rotation of the metering element relative to the housing. By rotation of the metering element during the injection operation, an axial displacement of the first element in a proximal direction toward the patient is performed to eject injection fluid from the container. The concept separates dose preselection motion from injection operation motion via the coupling arrangement.
In a further implementation, the metering element is rotatably but not axially displaceably relative to the housing, and an external thread associated with the metering element engages an internal thread of a sleeve-shaped element. Rotation of the metering element relative to the housing enables axial displacement of the sleeve-shaped element within the housing, thereby setting an injection dose. A manually adjustable dose-setting element is selectively coupled in a first mode during an injection operation and disengaged in a second mode for preselection of a desired injection dose.
Claims Coverage
The claims cover two independent inventive features focused on threaded dose-setting mechanisms and selective coupling between dose preselection and injection operation.
Threaded first element and rotatable metering element for dose preselection
A first element for ejecting injection fluid is shaped with an external thread, and a metering element is rotatably arranged relative to the housing with an internal thread in engagement with the external thread of the first element, so that the metering element is rotatable, together with the first element relative to the housing, for preselection of an injection dose.
Coupling arrangement blocking first-element rotation during injection but enabling metering-element rotation
A coupling arrangement blocks, during an injection operation, a rotation of the first element relative to the housing but enables a rotation of the metering element relative to the housing, so that rotation of the metering element during injection performs an axial displacement of the first element in a proximal direction toward the patient to eject injection fluid.
Rotatable, non-axially displaceable metering element with external thread driving axial sleeve displacement
A metering element is rotatably but not axially displaceably relative to the housing and has an external thread, wherein a sleeve-shaped element is axially movably in the housing but not rotatably relative to the housing and has an internal thread in engagement with the external thread of the metering element, enabling axial displacement of the sleeve-shaped element within the housing by rotation of the metering element to set an injection dose.
Selective first-mode engagement and second-mode disengagement of a manually adjustable dose-setting element
A manually adjustable dose-setting element is provided together with a coupling arrangement that is selectively operable in a first mode, forming engagement between the dose-setting element and the sleeve-shaped element during an injection operation, and in a second mode disengaging the dose-setting element from the sleeve-shaped element for preselection of a desired injection dose.
The claims cover injection dose selection mechanisms in which threaded elements cooperate so that, during injection operation, a coupling arrangement blocks rotation of a first threaded ejection element while allowing rotation of a metering element to drive proximal axial displacement, and in another implementation rotation of a rotatable, non-axially displaceable metering element drives axial movement of a sleeve-shaped element for dose setting, with selective engagement and disengagement of a manually adjustable dose-setting element.
Stated Advantages
Patient-friendly, self-evident operation.
Improved user compliance, especially for poor vision.
Documented Applications
No documented applications found
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