Deformable Needle Shield Locking Mechanism
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Solution Overview
Problem
Current safety injection needle devices are complex and costly to manufacture, and there is a need for a reliable, efficient needle protection device that prevents accidental punctures and disease transmission during medical procedures like insulin injections.
Innovation Solution
A safety injection needle device with a needle shield mechanism that automatically encloses the needle before and after use, featuring a deformable rear end and a spring-activated needle shield device to ensure secure protection, allowing for efficient manufacturing and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a needle protection device is added to prevent accidental punctures, then safety is improved, but device complexity increases
Solution Approach 1:
The needle shield device is nested within the sleeve element, with the needle hub arranged within the needle shield device. This nested configuration allows multiple protective components to be integrated in a compact manner, providing safety functionality without proportionally increasing device complexity
Solution Approach 2:
The needle shield device is made movable by a spring between a retracted position (exposing the needle) and an extracted position (enclosing the needle). This self-actuating mechanism automatically provides protection after use without requiring additional complex control systems or manual intervention
2Reliability
If a complex injection device with hidden needle is used, then safety is improved, but manufacturing cost increases
Solution Approach 1:
The device is segmented into distinct functional components: a device body with securing means, a sleeve element providing structural support, a needle shield device for protection, and a spring for actuation. This segmentation allows each component to be manufactured independently using standard processes and then assembled, reducing overall manufacturing complexity and cost compared to integrated designs
3Reliability
If a disposable needle hub with protection device is used, then safety is improved, but device complexity increases
Solution Approach 1:
The needle hub is merged with the needle shield device and spring mechanism, forming an integrated protective assembly. The needle hub has a conical shape that facilitates the movement and positioning of the needle shield device, combining structural support and protection functionality in a single component rather than requiring separate elements
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 device effectively prevents accidental punctures and injuries by automatically enclosing the needle after use, facilitating efficient manufacturing and assembly while ensuring safety and ease of use in medical procedures.
Implementation Method 1
a spring arranged to resilient support the needle shield device such that the needle shield device is forced towards the extracted position
Implementation Method 2
the rear end of the needle shield device is made of a deformable material such that at least a section of the rear end of the needle shield device is deformed by the needle hub such that the distance from axis A to the deformed section of the rear end in radial direction from axis A is increased when moved to the retracted position during injection of medicament
Data Source
AI summary
A safety injection needle device for delivery of a medicament from a storage reservoir with longitudinal axis A. The device includes: a device body; a needle; a needle shield device, and a spring. A rear end of the needle shield device is made of a deformable material such that at least a section of the rear end of the needle shield device is deformed such that the radius of the rear end is increased such that the needle shield device is locked in the extracted position.