Drug Delivery Guide Track Anti-Rotation Mechanism
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Solution Overview
Problem
Existing drug delivery devices face challenges in achieving high dose accuracy and user safety, particularly in preventing accidental dose delivery after the setting process is completed.
Innovation Solution
The assembly includes a housing with a dose member and a guide track featuring a first section for angular displacement and a second section for axial stop, utilizing a spring member to ensure the guide feature is retained in the axial stop position after dose setting, preventing accidental rotation and delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the guide feature is allowed to rotate freely after dose setting, then the device is easier to operate, but accidental dose delivery may occur reducing safety
Solution Approach 1:
The guide track's second section is designed to automatically engage with the guide feature after dose setting, creating a preliminary restraining action that prevents accidental rotation and dose delivery. This anti-action is built into the device structure itself, ensuring safety without compromising ease of operation.
2Measurement precision
If the spring member continuously biases the guide feature, then dose accuracy is improved, but the device complexity increases
Solution Approach 1:
The guide track is segmented into two distinct sections: the first section allows free rotation for dose setting, while the second section provides the stopping mechanism for accuracy. This segmentation enables precise dose control through the spring member's biasing action without requiring complex continuous control systems throughout the entire rotation path.
3Manufacturing precision
If the guide track includes both first and second sections with connection region, then dose accuracy and safety are improved, but the manufacturing complexity increases
Solution Approach 1:
The guide track combines multiple functions into a single integrated component: it provides the rotational path for dose setting, the spring member engagement surface for accuracy, and the automatic stopping mechanism for safety. By merging these functions into one piece rather than using separate components, the design achieves high manufacturing precision while maintaining reasonable ease of manufacture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures high dose accuracy and user safety by preventing accidental dose delivery, allowing for precise and controlled dispensing of pre-set drug doses.
Implementation Method 1
the spring member can be biased in advance in a state in which the guide feature is in the angular start position. When the guide feature has passed the connection region, the spring member can be released, so that the dose member can be rotated in the dose delivery direction by the spring member
Data Source
AI summary
An assembly for a drug delivery device includes a guide track and a spring member. A first section of the guide track defines an angular start position for a guide feature of the dose member and a second section of the guide track defines an axial stop position for the guide feature. When the dose member is rotated in a dose setting direction, the guide feature is angularly displaced from the angular start position towards a connection region of the guide track, the spring member is torsionally biased by the spring member towards the angular start position. When the guide feature passes the connection region, the guide feature enters the second section and is axially displaced towards the axial stop position in which reduction of the torsional bias is prevented by mechanical cooperation of the guide feature and the second section.