Injection Device Dual Latching Mechanism Haptic Feedback
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Solution Overview
Problem
Existing injection devices lack operating comfort due to the need for the operator to overcome two latching installations when setting the quantity of injection liquid, leading to inadequate haptic and acoustic feedback.
Innovation Solution
The injection device features two independent latching installations, one active when setting the quantity and the other when squeezing out, allowing for distinct haptic and acoustic feedback, with the second latching installation being stronger to provide clear feedback during injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two latching installations act simultaneously when setting the quantity of injection liquid, then the latching installations can be conceived so as to be comparatively weak, but the operator has to overcome both latching installations leading to insufficient haptic and acoustic feedback
Solution Approach 1:
The patent divides the latching function into two separate latching installations: a first latching installation that acts only when setting the quantity of injection liquid, and a second latching installation that acts only when squeezing out the injection liquid. This segmentation allows each latching installation to be optimized independently for its specific function, with the first providing gentle haptic feedback for dosage setting and the second providing strong acoustic feedback for injection delivery.
2Ease of operation
If the second latching installation is conceived so as to be comparatively weak, then it can be overcome during dosage setting, but it does not provide clear acoustic feedback when squeezing out injection liquid
Solution Approach 1:
The patent implements dynamic switching between different latching configurations based on the operational phase. The operating element can be in a first position where only the first latching installation is effective (during dosage setting) or a second position where only the second latching installation is effective (during injection). This dynamic reconfiguration allows the system to adapt its mechanical characteristics to the current operational requirements.
3Loss of information
If the first latching installation acts in both positions, then it provides haptic feedback during setting, but the second latching installation cannot provide distinct acoustic feedback during injection
Solution Approach 1:
The patent applies different latching characteristics to different operational phases: the first latching installation is designed with specific mechanical properties optimized for dosage setting with gentle haptic feedback, while the second latching installation is designed with different mechanical properties optimized for injection delivery with strong acoustic feedback. Each latching installation has localized quality tailored to its specific function.
Data Source
AI summary
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.