Manual Safety Injector Assembly for 5-10 mL Self-Injection
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Solution Overview
Problem
Existing manual injection devices are limited in volume to 1-3 mL and require complex assembly, increasing user error and cost, while wearable auto-injectors are cumbersome and costly.
Innovation Solution
A pre-assembled manual safety injector with a container assembly, injector assembly, and plunger assembly that allows self-administration of 5-10 mL doses, featuring a double-ended needle, biasing member, and automatic needle retraction, simplifying the injection process and ensuring user safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wearable auto-injectors are used for home injection, then injection reliability is improved, but device complexity and cost increase
Solution Approach 1:
The device is divided into three separable assemblies (container assembly, injector assembly, plunger assembly) that can be manufactured independently and assembled together, reducing overall device complexity while maintaining injection reliability through specialized function in each module
Solution Approach 2:
The injector assembly includes automatic needle retraction and safety features that operate without user intervention, ensuring reliable safe operation while reducing the complexity of user-controlled mechanisms
2Ease of operation
If manual injectors with safety features are designed for self-injection, then ease of operation is improved, but device complexity increases
Solution Approach 1:
Multiple functions (injection delivery, safety shielding, needle retraction) are merged into the injector assembly through the interaction of the middle body, outer holder, and biasing member, simplifying operation while managing complexity through functional integration
Solution Approach 2:
The biasing member automatically performs needle retraction and safety shielding without user action, improving ease of operation by eliminating manual safety steps while containing complexity within the automatic mechanism
3Ease of manufacture
If existing manual injection devices are used for 5-10 mL volumes, then manufacturing cost is reduced, but adaptability decreases
Solution Approach 1:
The injector assembly is designed with universal applicability to work with different container assemblies of various volumes (5-10 mL), allowing a single injector design to serve multiple volume requirements and improving adaptability without proportionally increasing manufacturing cost
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
Enables safe, user-friendly self-administration of larger medicament volumes with reduced complexity and cost, enhancing convenience and reliability for patients.
Implementation Method 1
a biasing member positioned between the middle body and the outer holder, at a distal end of each of the middle body and the outer holder
Data Source
AI summary
Provided herein is a manual safety injector that includes a container assembly, an injector assembly and a plunger assembly. The container assembly includes a container pre-filled with 5 to 10 mL of fluid therein and a needle assembly comprising a double-ended needle. The injector assembly includes an inner container holder, a middle body, and an outer holder in a nested arrangement, with the inner container holder movable within the middle body and the middle body movable within the outer holder. A first actuation of the plunger assembly moves the inner container holder distally within the middle body, to extend a distal end of the needle, and moves the needle assembly to place the needle in fluid communication with the container. An additional actuation of the plunger assembly expels fluid from the container and actuates a biasing member in the injector assembly to retract the needle back into the outer holder.