Autoinjector Drive Chassis Parallel Limb Design
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Solution Overview
Problem
Conventional autoinjectors are complex, costly, and environmentally impactful due to their large size, high material usage, and complex assembly processes, which complicates manufacturing, storage, and transportation, especially when requiring low temperatures.
Innovation Solution
A compact autoinjector design featuring a drive chassis with parallel dispensing and trigger limbs, a trigger arm, and a drive spring, which reduces the number of components and simplifies the assembly process, allowing for a smaller, more cost-effective device that minimizes material usage and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional autoinjector design is used, then reliable medicament delivery is achieved, but device complexity and material usage increase
Solution Approach 1:
The drive chassis integrates multiple components including the dispensing limb, trigger limb, and plunger rod into a single molded structure. This merging of components reduces the overall number of parts while maintaining the reliable medicament delivery function through the integrated mechanical structure.
Solution Approach 2:
The drive chassis serves multiple functions simultaneously: it acts as the drive mechanism for medicament delivery, the trigger mechanism for activation, and the structural framework for the entire device. This multi-functionality reduces complexity by eliminating the need for separate components for each function.
2Reliability
If conventional autoinjector design is used, then functional requirements are met, but material usage and environmental impact increase
Solution Approach 1:
The drive chassis combines multiple functional components into a single molded part, significantly reducing the total material required compared to conventional designs that use separate components. This integration maintains all necessary functions while minimizing material consumption and environmental impact.
3Strength
If conventional autoinjector design is used, then adequate structural strength is achieved, but device volume and storage requirements increase
Solution Approach 1:
The parallel arrangement of the trigger limb and dispensing limb within the drive chassis creates a compact nested structure. The trigger limb is positioned adjacent to and within the overall footprint of the dispensing limb, allowing the device to achieve adequate structural strength with minimized volume for storage and transport.
4Reliability
If conventional autoinjector design is used, then reliable operation is achieved, but manufacturing cost and assembly complexity increase
Solution Approach 1:
The drive chassis is manufactured as a single molded component that integrates the dispensing limb, trigger limb, and plunger rod. This merging eliminates multiple assembly steps and reduces manufacturing complexity while maintaining operational reliability through the integrated design.
Solution Approach 2:
The drive chassis is designed as a separate, self-contained module that can be manufactured independently and then assembled into the complete autoinjector. This segmentation allows for specialized manufacturing processes and simplified assembly while maintaining overall system reliability.
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 compact design reduces manufacturing costs, minimizes environmental impact, and simplifies storage and transportation by using fewer components and materials, while maintaining effective medicament delivery and user-friendly features.
Implementation Method 1
the autoinjector comprises a drive spring, wherein the drive spring is arranged within the housing between a distal housing wall and the drive chassis
Data Source
AI summary
An autoinjector includes a housing and a drive chassis arranged linearly moveable within the housing. The drive chassis includes a dispensing limb and a trigger limb. The trigger limb and the dispensing limb are arranged in parallel to one another and are connected to one another at a respective distal end of the dispensing limb and the trigger limb.