Injection Needle Cap Removal Tools for Reduced-Distortion Force Testing
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Solution Overview
Problem
Conventional injector testing systems distort the cap during removal force measurements due to gripping forces, leading to inaccurate and non-repeatable results.
Innovation Solution
A cap removal tool that retains the cap with reduced distortion, using a cap removal surface and alignment tools to ensure precise alignment with a load string, coupled with a force sensor for accurate measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional gripping methods are used to measure cap removal force, then the measurement process can be performed, but the cap becomes distorted leading to inaccurate and non-repeatable results
Solution Approach 1:
A cap retention tool is introduced as an intermediary device between the testing system and the cap. The tool includes a cap retention surface that contacts and holds the cap during removal force measurement, preventing direct gripping forces from distorting the cap while enabling accurate force measurement through integrated alignment features and load string positioning.
2Measurement precision
If precise alignment is required for accurate measurement, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The cap retention tool combines multiple functions into a single integrated component: cap retention, alignment reference, and load string positioning. The alignment features are built into the tool itself rather than requiring separate alignment mechanisms, reducing overall system complexity while maintaining precise alignment capability.
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
Improves the accuracy and repeatability of cap removal force measurements by minimizing distortion and ensuring precise alignment, aligning with industry standards like ISO 11608-5.
Implementation Method 1
circuitry configured to determine the removal force based on the measured removal distance and the spring constant
Data Source
AI summary
Disclosed example cap removal tools include: a cap removal adapter having a cap removal aperture; and a base, comprising: first alignment features configured to align the cap removal tool with an actuator of the autoinjector testing system; and second alignment features configured to removably attach the cap removal adapter to the base and align the cap removal adapter with the actuator.