Dose Setting Mechanism With Shaped Stop Elements
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Solution Overview
Problem
Existing medicament delivery devices lack effective mechanisms to prevent over-dosing, as they rely on rotational stoppers that may not provide clear tactile or audible feedback for setting precise doses, particularly for devices designed to deliver fixed doses.
Innovation Solution
A dose setting mechanism featuring a tubular member with a coaxially movable and rotationally locked stop member, including first and second stop elements that interact to limit rotation within a predetermined angular interval, providing tactile and/or audible feedback through shaped surfaces, ensuring accurate dose setting and preventing excessive dosing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rotational stoppers are used to limit dose drum rotation, then the device structure is simple, but clear tactile or audible feedback for precise dose setting is not provided
Solution Approach 1:
The patent employs shaped surfaces on the stop member and dose drum that generate tactile and audible feedback through mechanical interaction. As the dose drum rotates, the shaped surfaces create vibrations and clicking sounds that provide clear feedback to the user about the rotation position, enabling precise dose setting without complex electronic feedback systems.
Solution Approach 2:
The invention implements a feedback mechanism where the shaped surfaces on the stop member and dose drum interact to produce tactile and audible signals. This feedback loop allows the user to感知 the rotation position and achieve precise dose setting by feeling and hearing the feedback cues during the setting process.
2Reliability
If rotational stoppers are used to prevent over-dosing, then the mechanism is simple, but reliable prevention of excessive dosing is not achieved
Solution Approach 1:
The patent incorporates a stop member with shaped surfaces that are pre-configured to limit the rotation of the dose drum to a predetermined angular interval. This preliminary action prevents over-dosing by physically blocking further rotation before excessive dosing can occur, ensuring reliable dose control without requiring complex monitoring systems.
Solution Approach 2:
The shaped surfaces on the stop member and dose drum create tactile and audible feedback that signals to the user when the maximum dose position is reached. This feedback mechanism enhances reliability by providing clear indication that the predetermined angular interval has been reached, preventing users from setting excessive doses.
3Measurement precision
If the dose drum can rotate freely, then ease of operation is high, but precise control of the predetermined angular interval is lost
Solution Approach 1:
The shaped surfaces on the stop member and dose drum generate tactile vibrations and audible clicking sounds during rotation. These mechanical feedback cues guide the user through the rotation process, making it easy to identify and stop at the precise predetermined angular interval position without requiring complex control mechanisms.
Solution Approach 2:
The invention uses tactile and audible feedback from the interaction between shaped surfaces to indicate the predetermined angular interval. This feedback allows the user to easily control the rotation and achieve precise angular positioning by feeling and hearing the feedback signals, combining ease of operation with measurement precision.
Data Source
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AI summary
A dose setting mechanism for a medicament delivery device, which dose setting mechanism comprises, a tubular member 10, a dose drum 40, coaxial with the tubular member 10, and being axially and rotationally movable relative to the tubular member 10, a stop member 90, coaxial with the tubular member 10, and axially movable but rotationally locked relative to the tubular member 10, and further being axially jointly movable with the dose drum 40, wherein the stop member 90 comprises a first stop element 96 and in that said dose drum 40 comprises a second stop element 46, and wherein said first stop element 96 and said second stop element 46 are configured to interact with each other to limit rotation of the dose drum 40 to a predetermined angular interval.