Medicament Delivery Device Actuator Design
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Solution Overview
Problem
Existing medicament delivery devices have high complexity and manufacturing costs due to numerous components, and struggle to handle medicament containers of different sizes without requiring significant redesigns.
Innovation Solution
A medicament delivery device with a power unit and adjustable components, including a plunger rod, drive spring, actuator, and adjuster element, that allows for flexible use with various container sizes by modifying the adjuster element or activator unit, reducing the need for extensive redesign.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple components are used to provide automatic features, then functionality is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The actuator combines multiple functions into a single integrated component: it holds the plunger rod in a tensioned state, locks the actuator sleeve in a holding state, and enables automatic needle covering. This merging of functions reduces the number of separate components while maintaining the automatic features.
Solution Approach 2:
The actuator is designed as a multi-functional component that performs holding, locking, and automatic covering functions. This universal design allows a single component to replace what would traditionally require multiple separate parts, reducing overall device complexity.
2Manufacturing precision
If device components are fixed for specific container sizes, then manufacturing precision is improved, but adaptability to different container sizes deteriorates
Solution Approach 1:
The adjuster element provides adjustable positioning for the plunger rod, allowing the device to adapt to different medicament container lengths. This dynamic adjustment capability enables the same basic device structure to work with various container sizes without requiring redesign.
Solution Approach 2:
The position of the plunger rod can be adjusted by changing the adjuster element configuration, allowing the device to accommodate different container lengths. This parameter adjustment maintains manufacturing precision for each specific configuration while providing overall adaptability.
3Adaptability or versatility
If multiple parts are redesigned to handle different container sizes, then adaptability is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The adjuster element provides a simple, low-cost mechanism for adjusting plunger rod position to match different container lengths. This single adjustable component avoids the need to redesign multiple parts, maintaining ease of manufacture while achieving adaptability.
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 solution simplifies the device structure while enabling efficient handling of different medicament container sizes, reducing complexity and manufacturing costs while maintaining functionality.
Implementation Method 1
a drive spring operably arranged to act on the plunger rod
Data Source
AI summary
A medicament delivery device having a housing, arranged to accommodate a medicament container and a power unit, where the power unit has a plunger rod, a drive spring, operably arranged to act on the plunger rod and on said medicament container, an actuator having holding elements that can releasably hold the plunger rod with said drive spring in a tensioned state, and an actuator sleeve operably connected to said actuator for releasably locking said holding elements in a holding state. The medicament delivery device also can have a medicament delivery member guard slidably movable in said housing that can act on said actuator sleeve for setting said holding elements with said actuator sleeve in a first activation state; an activator unit arranged to be manually operated and which is operably connected to said plunger rod for setting said holding elements with said actuator sleeve in a second activation state.