Medicament Delivery Plunger Rod Feedback Spring Mechanism
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Solution Overview
Problem
Existing medicament delivery devices often rely on complex feedback mechanisms, such as the U-bracket, which can be costly and lack simplicity in providing both feedback and tolerance management.
Innovation Solution
A sub-assembly for medicament delivery devices comprising a plunger rod and a feedback component with a spring, where the feedback component is engaged and disengaged by the plunger rod to provide feedback and manage tolerance, potentially replacing the U-bracket and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex feedback mechanism like the U-bracket is used, then feedback can be provided effectively, but the device complexity and cost increase
Solution Approach 1:
The feedback component is integrated directly into the plunger rod assembly, merging the feedback mechanism with the existing plunger rod structure. This eliminates the need for separate complex feedback components like the U-bracket while maintaining feedback functionality through the engagement and disengagement of the feedback component's distally facing surface with the plunger rod's proximally facing surface
Solution Approach 2:
The feedback component serves multiple functions: it provides feedback to the user during operation, manages tolerance in the assembly, and works integrally with the plunger rod mechanism. This multi-functionality reduces the need for separate dedicated components for each function, thereby simplifying the overall device structure
2Reliability
If a separate U-bracket metal component is used for feedback, then feedback functionality is achieved, but manufacturing cost increases
Solution Approach 1:
The feedback component is combined with the plunger rod or its flexible arm, eliminating the need for a separate U-bracket metal component. This integration reduces the number of parts that need to be manufactured and assembled, thereby reducing manufacturing cost while maintaining feedback functionality
Solution Approach 2:
The feedback component appears to be designed as a simpler, potentially disposable element that can be integrated into the plunger rod assembly. This approach replaces expensive metal components like the U-bracket with a more cost-effective solution that achieves the same feedback functionality
3Reliability
If multiple separate components are used for feedback and tolerance management, then each function can be optimized, but the overall device simplicity is reduced
Solution Approach 1:
The feedback component and tolerance management features are merged into a single integrated component that works with the plunger rod. This integration maintains functional optimization for both feedback and tolerance management while reducing the total number of separate components in the device
Solution Approach 2:
The feedback component is designed to perform multiple functions simultaneously: providing feedback to the user and managing assembly tolerance. This multi-functionality allows a single component to replace what would otherwise require multiple separate components, thereby improving device simplicity
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
The proposed solution enables the provision of feedback and tolerance management from a single structure, enhancing simplicity and reducing costs by potentially removing the need for a metal component like the U-bracket.
Implementation Method 1
the feedback component comprises a spring
Data Source
AI summary
The present disclosure provides a sub-assembly for a medicament delivery device, the sub-assembly extending along a longitudinal axis in a longitudinal direction from a proximal end to a distal end. The sub-assembly includes a plunger rod, the plunger rod comprising a proximally facing surface that faces towards the proximal end. The sub-assembly further includes a feedback component comprising a distally facing surface facing towards the distal end, so that when the plunger rod moves towards the proximal end during use of the medicament delivery device, the distally facing surface of the feedback component is engaged by the proximally facing surface of the plunger rod, is subsequently moved towards the proximal end by the plunger rod, and is finally disengaged from the proximally facing surface of the plunger rod, wherein the feedback component comprises a spring.