Cannula Insertion Device with Sliding Hub and Multi-Port System
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Solution Overview
Problem
Existing cannula insertion devices expose needles before and after insertion, risking contamination and needle stick injuries, and lack efficient methods for delivering ancillary medications without restricting patient mobility or requiring extensive flushing and additional connectors.
Innovation Solution
A cannula insertion device with a sliding hub and frame that shields the needle during insertion and withdrawal, allowing safe detachment only when the needle is fully withdrawn, and enables simultaneous delivery of multiple fluids through a multi-port system without the need for additional connectors or extensive flushing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the needle is exposed before and after insertion for easy operation, then the ease of operation is improved, but the risk of needle stick injury and contamination increases
Solution Approach 1:
The needle is nested within a protective sheath that slides over it during insertion and remains covering it after insertion. The hub contains the needle in a retracted position, and the sheath provides an additional layer of protection, creating a nested structure that eliminates needle exposure while maintaining operational capability
Solution Approach 2:
The protective sheath is pre-positioned to cover the needle before insertion begins. The hub is designed with pre-configured engagement features that automatically secure the needle in a protected state after insertion, eliminating the need for manual retraction or additional protective steps
2Ease of operation
If a hollow needle on the connecting hub is used to pierce the septum, then the connection function is achieved, but the risk of needle stick injury and difficulty in alignment occur
Solution Approach 1:
The hollow needle is completely removed from the connecting hub design. Instead, a blunt, non-piercing interface is used that achieves the connection function through mechanical engagement with the adapter, eliminating the harmful piercing element while maintaining the essential connection capability
Solution Approach 2:
An adapter or interface component serves as an intermediary between the hub and the injection port. This intermediary provides the necessary mechanical engagement and fluid pathway connection without requiring a sharp piercing needle, thus eliminating the injury risk while achieving the connection function
3Adaptability or versatility
If a multi-port device is provided upstream to deliver multiple fluids, then the versatility is improved, but the device complexity and patient mobility restriction increase
Solution Approach 1:
The hub is designed with multiple ports that can each accommodate different types of connectors and fluid delivery systems. This universal interface allows the same hub structure to support single-fluid or multi-fluid delivery configurations, providing versatility without requiring complex dedicated structures for each scenario
Data Source
Figure 1
Figure 2(a)~2(c)
Figure 2(d)~2(f)
AI summary
A cannula insertion device comprises an elongate frame and a hub mounted to the frame and arranged to be slidably moveable from a first position forwards along a longitudinal axis to a second position relative to the frame and a needle projecting forwards from the hub and carrying a detachable cannula assembly including a cannula. The frame and hub are arranged to allow the hub to be moved forwards from the first position to the second position so as to insert the cannula into a patient and to be drawn backwards to a withdrawn position. The needle is shielded by the frame when the hub is in the first position and also when in the withdrawn position.