Microcartridge Safety Cap Locking Mechanism
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Solution Overview
Problem
Existing injection devices lack safety features to prevent re-use and accidental needle sticks, particularly in self-administered injections for frequent medication, such as those required by diabetes patients, which increases the risk of infections and injuries.
Innovation Solution
A container design with a housing and vial system that includes a plunger rod, injection member, and safety cap, where the safety cap is locked after use, preventing removal and ensuring sterility, and features like flexible tabs and plunger adaptors control the delivery force to ensure proper needle insertion before medicament delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If injection devices are made single-use to prevent infections and needle stick injuries, then safety is improved, but device complexity increases due to additional safety features
Solution Approach 1:
The injection device is divided into separable components including a removable safety cap, a vial with medicament, a plunger assembly, and a housing. This segmentation allows the safety cap to be removed only when needed and enables the device to be disposed of as a single unit after use, simplifying the overall safety mechanism while maintaining effectiveness.
Solution Approach 2:
The safety cap is pre-positioned on the injection device before use, and the plunger is pre-loaded into the vial. These preliminary actions ensure that safety features are already in place before the user needs them, preventing accidental needle sticks during storage and transport without requiring complex active safety mechanisms.
2Reliability
If a safety cap is designed to be permanently locked after use to prevent re-use, then prevention of re-use is improved, but ease of operation deteriorates due to additional locking mechanisms
Solution Approach 1:
The entire injection device including the safety cap is designed as a disposable single-use unit. After one use, the entire assembly is discarded, eliminating the need for complex reusable locking mechanisms while ensuring prevention of re-use. The simplicity of the disposable design maintains ease of operation.
Solution Approach 2:
The safety cap is designed to be completely removed from the device after use, rather than remaining attached with complex locking mechanisms. This extraction approach simplifies the operation - users simply pull the cap off and discard the entire device, achieving prevention of re-use without adding operational complexity.
3Manufacturing precision
If flexible tabs and plunger adaptors are added to control delivery force, then precision of medicament delivery is improved, but device complexity increases
Solution Approach 1:
The flexible tabs and plunger adaptors are designed to change their mechanical parameters (flexibility, engagement force) based on the insertion process. As the plunger is pushed, these components progressively engage and disengage, automatically adjusting the delivery force to ensure proper needle insertion before medicament delivery without requiring complex electronic or mechanical control systems.
Data Source
AI summary
A container for delivering a medicament to a target location includes a housing having a proximal end and a distal end, the housing including a cap locking tab at the distal end, and a vial containing the medicament. The container includes a plunger slidable within the vial from a proximal end to a distal end of the vial to dispel the medicament, an injection member associated with the distal end of the vial, such that the medicament dispelled from the vial passes through the injection member to the target location, and a slidable interaction member associated with the distal end of the vial configured to slide with the vial. An interaction between the slidable interaction member and the cap locking tab causes the cap locking tab to bias outward, and placement of a safety cap on the container after use locks the safety cap onto the container via an interaction with the cap locking tab. The container may further include a resistance feature to control movement of a plunger rod relative to the vial.