Cannula Tip Protector Sliding Sleeve for Fragile Needles
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Solution Overview
Problem
Subretinal injection procedures require precise and safe handling of fragile needles with small diameters, which are susceptible to bending or breaking, necessitating improved protection and visualization during insertion and fluid delivery.
Innovation Solution
A cannula tip protector assembly for Luer type syringes featuring a protection sleeve that can be slidably moved between covering and exposing the needle tip, combined with a cannula tip protector actuator unit, allowing for safe insertion and accurate fluid delivery, and compatibility with various syringe sizes and needle diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a thin needle tip is used for subretinal injection, then the precision and safety of fluid delivery is improved, but the needle becomes susceptible to bending or breaking
Solution Approach 1:
The protection sleeve is slidably positioned over the syringe needle and needle tip, with the ability to cover or expose the needle tip as needed. This nested configuration allows the fragile needle to be protected within a stouter sleeve during insertion, while remaining accessible for precise fluid delivery when exposed.
Solution Approach 2:
The protection sleeve acts as an intermediary element between the operator and the fragile needle tip. It provides mechanical support and protection during the insertion process through the eyeball, while allowing the needle tip to perform its precise function when needed.
2Strength
If a protection sleeve is added to protect the needle tip, then the strength and protection of the needle is improved, but the device complexity increases
Solution Approach 1:
The protection sleeve is designed to be movable rather than fixed, allowing it to be slid back and forth to cover or expose the needle tip. This dynamic design provides flexibility in protecting the needle only when necessary during insertion, while maintaining simplicity in the overall device structure.
Solution Approach 2:
The syringe assembly is segmented into distinct functional parts: the Luer connector, syringe needle, needle tip, and protection sleeve. This segmentation allows each component to perform its specific function independently while maintaining overall system simplicity.
3Ease of operation
If the needle tip is exposed for fluid delivery, then the functionality for injection is improved, but the risk of bending or breaking during insertion increases
Solution Approach 1:
The protection sleeve can be dynamically positioned to cover the needle tip during insertion for protection, then moved back to expose the needle tip for fluid delivery. This dynamic adjustment allows the system to optimize for either protection or functionality as needed.
Solution Approach 2:
The protection sleeve is positioned to cover the needle tip before insertion begins, providing preliminary protection. The sleeve remains in place during the insertion process through the eyeball, and is only moved back when the needle tip needs to be exposed for fluid delivery.
Data Source
AI summary
Provided herein is a cannula tip protector assembly for a Luer type syringe having a Luer connector with a syringe needle having a first diameter, and a needle tip having a second diameter smaller than the first diameter, the needle tip is attached in fluid communication to the syringe needle at an end of the syringe needle opposite the Luer connector, a protection sleeve slidably positioned over the syringe needle and needle tip, and a cannula tip protector actuator unit having a Luer connector attachment part and a protection sleeve connector, the cannula tip protector actuator unit arranged to move the protection sleeve from a first position in which the needle tip is covered by the protection sleeve to a second position in which the needle tip is exposed outside the protection sleeve.