Medicament Cap Assembly With Movable Connector for Low-Force Removal
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Solution Overview
Problem
Existing medicament delivery devices face difficulties in cap assembly removal due to significant friction between the medicament delivery member and the shield, making it challenging for users with impaired hands or elders to easily remove the cap assembly.
Innovation Solution
A cap assembly design featuring a tubular outer shell, a shield remover, and a connector that allows the shield remover to move relative to the tubular outer shell in the longitudinal direction, reducing the required force for removal by allowing the tubular outer shell to move a longer distance than the shield remover, facilitated by a connector that can rotate or pivot relative to the tubular outer shell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cap assembly is designed with a shield remover tightly gripping the medicament delivery member shield, then the shield remover can effectively remove the shield, but the friction between the medicament delivery member and the shield becomes significant, making the cap assembly difficult to remove
Solution Approach 1:
The connector is designed to be movable relative to the tubular outer shell, allowing it to rotate or pivot during the removal process. This dynamic mechanism enables the shield remover to maintain gripping force on the shield while reducing the friction resistance encountered during cap assembly removal, thus resolving the contradiction between effective shield removal and ease of operation.
2Device complexity
If the tubular outer shell is fixed to the shield remover, then the structure is simple and stable, but the required force to remove the cap assembly becomes high due to significant friction
Solution Approach 1:
The connector is designed with movable connections to both the tubular outer shell and the shield remover, allowing rotation and pivoting motions. This dynamic linkage enables the system to convert the user's removal force into effective shield removal force while reducing the overall force required, maintaining structural simplicity while lowering the removal force threshold.
Solution Approach 2:
The movable connector acts as an intermediary mechanism between the tubular outer shell and the shield remover. It transmits and transforms the force applied by the user, converting linear pulling motion into effective shield removal motion while reducing the peak force required, thus resolving the contradiction between structural simplicity and low removal force.
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 easier removal of the cap assembly with reduced force, enhancing usability for a wider range of users, including those with impaired hands or elders.
Implementation Method 1
the connector is configured to be moved in the proximal direction by a movement of the tubular outer shell in the proximal direction; such that the shield remover is moved a distance smaller than a distance moved by the tubular outer shell
Data Source
AI summary
The present disclosure provides a cap assembly of a medicament delivery device. The cap assembly includes a tubular outer shell, a shield remover, and a connector. The tubular outer shell extends along a longitudinal axis between a proximal end and a distal end. The shield remover is at least partially arranged within the tubular outer shell. The shield remover is movable relative to the tubular outer shell in the direction of the longitudinal axis, and the connector is arranged within the tubular outer shell. The connector is movably connected to both the tubular outer shell and the shield remover, and the connector is configured to be moved in the proximal direction by a movement of the tubular outer shell in the proximal direction; such that the shield remover is moved a distance smaller than a distance moved by the tubular outer shell.