Transfer Needle Assembly With Sliding Guide And Retractable Tip
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Solution Overview
Problem
Existing transfer needle assemblies complicate the dissolution process, risk needle contamination and injury, and lead to liquid leakage due to the exposure of the needle tip during medical liquid transfer operations.
Innovation Solution
A two-position structure for the vial guide portion is introduced, where the needle tip is housed before use and retracts during piercing, allowing for easy sliding between guide members to prevent exposure and leakage, with flexible engaging claws that release engagement upon vial insertion to facilitate safe and efficient liquid transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the needle tip is exposed for easy insertion, then the operation is simplified, but the needle tip becomes contaminated and causes injury
Solution Approach 1:
The puncture needle is nested inside the inside guide member, which is itself nested inside the outside guide member. The needle tip is housed within the inside guide member before use, protecting it from contamination and injury risks while maintaining ease of operation when needed.
Solution Approach 2:
The inside guide member is designed to slide relative to the outside guide member, transitioning from a retracted position (housing the needle tip) to an extended position (allowing needle insertion). This dynamic movement enables the system to switch between safety mode and operation mode.
2Object-affected harmful factors
If the skirt length is extended to cover the needle tip, then contamination and injury are prevented, but the vial cannot be fitted straight causing leakage
Solution Approach 1:
The guide structure is divided into two separate guide members (inside and outside) with different functions. The outside guide member's skirt provides protection, while the inside guide member enables precise positioning and sliding movement to prevent leakage during insertion.
Solution Approach 2:
The inside guide member can slide relative to the outside guide member, allowing the system to adapt its configuration. During vial insertion, the sliding mechanism enables the needle to be properly positioned while maintaining the protective covering, thus preventing both contamination and leakage.
3Object-affected harmful factors
If the needle tip is retracted for safety, then contamination and injury are avoided, but the dissolution operation becomes complicated
Solution Approach 1:
The inside guide member automatically slides to the appropriate position when the vial is inserted, eliminating the need for manual operation to expose the needle. The system self-adjusts during the dissolution operation, maintaining safety while simplifying the overall process.
Solution Approach 2:
The sliding mechanism of the inside guide member is designed to operate automatically in response to vial insertion, providing a simple, intuitive operation that does not increase procedural complexity despite the added safety features.
Data Source
AI summary
A transfer needle assembly including a cap-like outside guide member; a tubular inside guide member; and a puncture member. The puncture member has a tip fitting portion at a proximal end and a puncture needle at a distal end. The inside guide member can slide along an inner wall of a skirt portion of the outside guide member from a position where a distal end of the needle is receded in the inside guide member, to a position where the distal end of the needle projects outside of the inside guide member. At the position where the distal end of the needle is receded in the inside guide member, the outside guide member and the inside guide member are engaged so as to be incapable of sliding, with the engagement being releasable by inserting a mouth portion of a vial into the inside guide member.