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Publication Number
US-10646658-B2
Publication Date
2020-05-12
Expiration Date
Abstract
An injection device includes: a housing defining a longitudinal axis; an operating element; a metering member held in the housing so as to be rotatable and fixed in the direction of the axis; the operating element, in a first position for setting a quantity to be dispensed, being mounted so as to be rotatable relative to the housing and rotationally fixedly connected to the metering member via a first coupling; the operating element, in a second position for dispensing, being rotationally fixedly connected to the housing via a second coupling and being rotatable in relation to the metering member; a first latching installation acting between operating element and housing, wherein the first latching installation is effective only in the operating element's first position; and, a second latching installation acting between operating element and metering member, wherein the second latching installation is effective only in the operating element's second position.
Core Innovation
The invention relates to an injection device with a housing that defines a longitudinal central axis, and an operating element. A metering member is held in the housing so as to be rotatable and fixed in a direction of the longitudinal central axis. The operating element is mounted to switch between a first position for setting a quantity of injection liquid to be squeezed out and a second position for squeezing out the quantity.
In the first position, the operating element is connected in a rotationally fixed manner to the metering member via a first coupling, and a first latching installation acts between the operating element and the housing only in the first position. In the second position, the operating element is connected in a rotationally fixed manner to the housing by way of a second coupling, while being rotatable in relation to the metering member, and a second latching installation acts between the operating element and the metering member only in the second position.
The metering piston is connected in a rotationally fixed manner to the operating element and connected to the metering member by way of a first threaded connection. In one embodiment, a spring is tensioned when setting the quantity and, when the first coupling is released, causes injection liquid to be squeezed out, coupling the dispensing actuation to the first coupling release. Additional structure includes an entrainment element connected to the metering member in a rotationally fixed manner.
Claims Coverage
The provided document includes three independent claims (clm-00001, clm-00012, clm-00013). Across these independent claims, the coverage is grounded on two-position operation with position-dependent couplings and latching installations between the operating element, housing, and metering member, together with a metering-piston threaded connection, a spring released by the first coupling, and a rotationally fixed entrainment element.
Two-position rotational coupling with position-dependent latching installations
An injection device with a housing and an operating element, where a metering member is rotatable and fixed in the direction of the longitudinal central axis; the operating element is connected by a first coupling to the metering member in a first position for setting a quantity and is connected by a second coupling to the housing in a second position for squeezing out the quantity; a first latching installation acts only in the first position between the operating element and the housing; and a second latching installation acts only in the second position between the operating element and the metering member.
Metering piston threaded connection to the metering member
The metering piston is connected in a rotationally fixed manner to the operating element, wherein the metering piston is connected to the metering member by way of a first threaded connection.
Spring tensioned in setting and released by first coupling
A spring is tensioned when setting the quantity of injection liquid to be squeezed out and, when the first coupling is released, causes injection liquid to be squeezed out.
Rotationally fixed entrainment element
An entrainment element connected to the metering member in a rotationally fixed manner.
The independent claims consistently require a two-position injection actuation architecture where a first coupling and a first latching installation are effective only in the setting position and a second coupling and a second latching installation are effective only in the dispensing position. Additional coverage includes a metering piston connected to the metering member by a first threaded connection, a spring that is tensioned during setting and drives squeezing out upon release of the first coupling, and an entrainment element connected rotationally fixed to the metering member.
Stated Advantages
Documented Applications
No documented applications found
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