Medicament Delivery Sub-assembly Transport Lock
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Solution Overview
Problem
Existing medicament delivery devices face challenges in maintaining a secure transport lock during assembly, which can lead to premature unlocking of the powerpack, increasing the risk of accidental activation.
Innovation Solution
A sub-assembly comprising a housing and a rear cap with a flexible arm, where the flexible arm flexes to engage and maintain a transport lock even after the rear cap is partially inserted, reducing the risk of premature unlocking during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rear cap is inserted into the housing during assembly, then the powerpack is unlocked, but the transport lock is lost and accidental activation risk increases
Solution Approach 1:
The flexible arm is pre-configured to engage the transport lock mechanism before the rear cap is fully inserted into the housing. The arm's elastic nature allows it to maintain engagement with the powerpack during the insertion process, ensuring the transport lock is established in advance of complete assembly.
Solution Approach 2:
The flexible arm provides dynamic adaptation during assembly, allowing the rear cap to be inserted while maintaining continuous engagement with the powerpack. The arm's flexibility enables it to deform and recover, ensuring sustained transport lock maintenance throughout the assembly motion.
2Ease of manufacture
If the powerpack is unlocked during assembly, then the rear cap can be inserted into the housing, but the risk of accidental activation increases
Solution Approach 1:
The flexible arm acts as an intermediary mechanism between the rear cap and the powerpack. It mediates the unlocking process by maintaining controlled engagement, allowing assembly to proceed while preventing accidental activation through sustained mechanical connection.
Solution Approach 2:
The elastic properties of the flexible arm provide beforehand cushioning during the unlocking process. The arm's ability to deform and store energy creates a buffer that prevents sudden or accidental disengagement, cushioning against potential harmful activation during assembly.
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 described sub-assembly effectively maintains a transport lock during assembly, reducing the time the powerpack is unlocked and minimizing the risk of accidental activation, thereby enhancing the safety and reliability of medicament delivery devices.
Implementation Method 1
the flexible arm comprising a first surface facing in the proximal direction, wherein the rear cap comprises a second surface facing in the proximal direction... so that when the rear cap is inserted into the distal end of the housing during assembly, the first surface of the rear cap engages the first surface of the housing and thereby flexes the flexible arm
Data Source
AI summary
The present disclosure provides a sub-assembly for a medicament delivery device, the sub-assembly comprising a housing and a rear cap arranged coaxially in the housing. The housing is tubular and extends from a proximal end to a distal end along a longitudinal axis in an axial direction, and the housing includes an inner surface and an outer surface. The inner surface of the housing includes a first surface facing in the distal direction and a second surface facing in the distal direction. The second surface is closer to the distal end of the housing than the first surface. The rear cap extends from a proximal end to a distal end along the longitudinal axis. The rear cap includes a flexible arm, the flexible arm comprising a first surface facing in the proximal direction, and the rear cap comprises a second surface facing in the proximal direction.