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Publication Number
US-10493211-B2
Publication Date
2019-12-03
Expiration Date
Abstract
An injection device includes a housing; a receptacle for injection fluid; a dosing piston to press out the injection fluid; a feed part connected to the dosing piston via a first threaded connection; a slide having a thread of a second threaded connection; and, a setting part having a thread of a third threaded connection and configured to set an amount of injection fluid to be dispensed. The setting part moves in the distal direction by virtue of the third threaded connection when the amount of injection fluid to be dispensed is being set. The setting part can move in the proximal direction when the injection fluid is pressed out. A latching unit defines a latching position of the setting part and acts between the setting part and housing. Each latching position has an unequivocal rotational position of the setting part in relation to the housing assigned thereto.
Core Innovation
The invention relates to an injection device defining a longitudinal center axis, a proximal direction and a distal direction, with a housing and a container configured to contain an injection fluid. The device includes a dosing piston configured to squeeze out the injection fluid out of the container, a feed part connected to the dosing piston via a first threaded connection, and a slide having a thread of a second threaded connection.
A setting part having a thread of a third threaded connection is configured to set an amount of injection fluid to be dispensed. During setting, the setting part rotates in a first rotation direction about the longitudinal center axis and moves in the distal direction by virtue of the third threaded connection in relation to the housing. When the injection fluid is being pressed out of the container, the setting part is rotated in a second rotation direction counter to the first rotation direction and moves in the proximal direction.
The device includes a latching unit defining at least one latching position of the setting part, the latching unit configured to act between the setting part and the housing. The latching unit is active at least when the amount of injection fluid to be dispensed out of the container is being set, and includes a latching part displaceable in the direction of the longitudinal center axis independently of the setting part. Each latching position has an assigned unequivocal rotational position of the setting part in relation to the housing.
Claims Coverage
The claims define a threaded setting part with bidirectional rotation and axial movement combined with a latching unit that provides latching positions having an assigned unequivocal rotational position relative to the housing. The dependent claims further specify coupling states, toothing engagement behavior, a second latching unit with longitudinal webs guiding the feed part, and a spring biasing arrangement for the slide.
Threaded setting part with bidirectional rotation and axial movement
A setting part having a thread of a third threaded connection is configured to set an amount of injection fluid to be dispensed, wherein, in relation to the housing, the setting part rotates in a first rotation direction about the longitudinal center axis and moves in the distal direction during setting, and is rotated in a second rotation direction counter to the first rotation direction and moves in the proximal direction when the injection fluid is being pressed out of the container.
Latching positions with assigned unequivocal rotational position relative to the housing
A latching unit defining at least one latching position is configured to act between the setting part and the housing and is active at least when the amount of injection fluid to be dispensed out of the container is being set, wherein the latching unit includes a latching part displaceable in the direction of the longitudinal center axis independently of the setting part, and each latching position has an assigned unequivocal rotational position of the setting part in relation to the housing.
Conditionally coupled entrainer-to-latching interaction with actuation-button proximal and distal positions
An entrainer and a coupling arranged for rotationally fixed connection in specific coupling positions, together with an actuation button having a distal position and a proximal position, where the proximal-direction displacement of the actuation button moves the coupling from a first coupling position to a second coupling position, including relative rotation in one actuation-button state and a rotationally fixed connection in another actuation-button state.
Toothing engagement selection conditioned on distal versus proximal actuation-button positioning
A coupling part including first toothing and second toothing that, when the actuation button is in a distal position, engages only one of the first toothing and the second toothing, and when the actuation button is in a proximal position, connects rotationally fixed to both the first toothing and the second toothing.
Second latching unit with longitudinal webs guiding the feed part
A second latching unit connected to the housing, the second latching unit having longitudinal webs arranged to guide the feed part as the injection fluid is dispensed.
Spring biasing of the slide in a second rotation direction
A spring configured to act between the slide and the housing to bias the slide in a second rotation direction.
Overall, the claims coverage is grounded in an injection device architecture that combines a threaded setting part with bidirectional rotation and axial movement, together with a latching unit that defines latching positions having an assigned unequivocal rotational position relative to the housing. Dependent refinements further specify entrainer and coupling interactions depending on actuation-button proximal and distal positions, including toothing engagement behavior, and add a second latching unit with guiding longitudinal webs plus a spring biasing arrangement for the slide.
Stated Advantages
Allows latching positions with variable spacing between increments and omits latching steps for non-envisaged doses.
Allows reset without audible clicks.
Guides the feed part with reduced perceptibility.
Documented Applications
Setting an amount of injection fluid to be dispensed and pressing injection fluid out of a container in an injection device.
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