Needle Shield Assembly With Consistent Pull-Out and Sealing
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Solution Overview
Problem
Existing needle shield assemblies for medical injection devices are difficult to remove, requiring varying pull-out forces that can be too high for users with reduced strength, and often cause material incompatibilities leading to unpredictable and disconcerting removal experiences.
Innovation Solution
A needle shield assembly comprising a rigid shield made of thermoplastic material, a flexible shield with elastomeric properties, and a septum for sealing, designed to provide a consistent pull-out force and prevent leaks, with an integrated RFID tag for traceability, ensuring a soft touch and easy removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a needle shield is designed to cover the needle completely for safety, then needlestick injury prevention is improved, but the shield may interfere with proper needle insertion and positioning
Solution Approach 1:
The needle shield is designed with movable components that allow it to transition between different positions. The shield can be moved from an initial position where it covers the needle tip for safety during handling, to a retracted position that allows proper needle insertion and positioning. This dynamic adjustment resolves the contradiction by providing both protection and operational ease at different stages of use.
Solution Approach 2:
The needle shield assembly is divided into multiple segments or components including a proximal portion, a distal portion, and a movable section. This segmentation allows different parts of the shield to perform different functions - the proximal portion maintains coverage for safety while the distal portion can be adjusted or retracted to facilitate proper needle insertion and positioning.
2Reliability
If the needle shield structure is made complex to ensure complete coverage and safety, then protection effectiveness is improved, but the device complexity increases
Solution Approach 1:
The needle shield is designed to perform multiple functions with a relatively simple structure. It provides complete needle coverage for protection, allows for proper needle insertion through controlled movement, and maintains sterility. This multi-functionality reduces the need for additional complex components while achieving comprehensive protection.
Solution Approach 2:
The needle shield combines several protective and functional features into a single integrated structure. The shield integrates the coverage function, the movement mechanism for insertion facilitation, and the positioning features all in one component, thereby reducing overall device complexity while maintaining effective protection.
3Reliability
If the needle shield is designed to remain in place during injection, then continuous protection is improved, but it may interfere with proper needle positioning and patient comfort
Solution Approach 1:
The needle shield incorporates dynamic movement capabilities that allow it to adjust its position during the injection process. The shield can be moved from a protective covering position to a retracted or positioned state that facilitates proper needle insertion and patient comfort, then maintain an appropriate position throughout the injection to provide continuous protection without interference.
Data Source
Figure 1~2
Figure 3~5
AI summary
The present invention relates to a needle shield assembly (10) for a medical injection device (1) such as a syringe comprising at its distal end a longitudinal hub portion (3) equipped with a needle (5) on which said needle shield assembly (10) is intended to be removably engaged, the said needle shield assembly (10) comprising: - a rigid shield (20) elongated in an longitudinal direction formed of a first material, said rigid shield (20) having a wall (21) including an inner surface (22) and an outer surface (23), - a flexible shield (30) formed of a second material different from the first material, said flexible shield (30) comprising an outer layer (31) having an inner surface (3T) covering at least part of the rigid shield outer surface (23) and an inner layer (32), being capable of receiving in a sealing way at least part of the hub portion (3) of the medical injection device (1), and covering at least partly the inner surface (22) of the rigid shield (20) and - a septum (40) formed of a third material different from the said first and second materials, said septum (40) being at least partly in contact with the inner surface (22) of the rigid shield (20) and being capable of ensuring a fluid and tight seal of the distal end of the medical injection device (1).