Movable Cannula Needle Tip Retraction Mechanism
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Solution Overview
Problem
Cannulation devices with protruding needle tips pose a safety risk for users, as they can cause accidental injuries and may transmit bacteria or viruses from patients to users during insertion and removal.
Innovation Solution
A cannulation device with a puncture needle that is movably connected to a cannula, allowing the needle tip to be hidden or covered, featuring a sliding mechanism along the longitudinal axis, and secured by connecting elements to lock the needle in safe and puncture positions, ensuring the tip is protected from accidental exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the needle tip protrudes out of the cannula, then the puncture function is effective, but the safety risk increases
Solution Approach 1:
The needle holder is designed to be movable relative to the cannula holder, allowing the needle tip to dynamically transition between protruding (for effective puncture) and retracted (for safety) positions. This dynamic configuration resolves the contradiction by enabling the system to adapt its state based on operational requirements.
Solution Approach 2:
The device is segmented into distinct functional components: the needle holder containing the puncture needle, and the cannula holder containing the cannula. This segmentation allows independent movement and positioning of each component, enabling the needle tip to be exposed only when needed for puncture while remaining protected otherwise.
2Object-affected harmful factors
If the needle tip is covered by the cannula, then the safety risk is reduced, but the puncture capability is compromised
Solution Approach 1:
The movable needle holder allows the system to switch between two functional states: a protected state where the needle tip is covered for safety, and an active state where the needle tip protrudes for effective puncture. This dynamic state change resolves the contradiction between safety and puncture capability.
3Device complexity
If the puncture needle is fixed inside the cannula, then the structure is simple, but the safety control is limited
Solution Approach 1:
The device incorporates a movable needle holder that can slide relative to the cannula holder along the longitudinal axis, enabling the needle tip to transition between exposed and retracted positions. This simple mechanical movement provides effective safety control without significantly increasing structural complexity.
Solution Approach 2:
The connecting elements automatically lock the needle holder in the cannula holder, providing self-contained safety control. The movable design allows the user to easily expose or protect the needle tip as needed, giving the system self-service capability for safety management.
Data Source
AI summary
The invention relates to a cannulation device (1) for providing an access to a patient through a skin of the patient, comprising a puncture needle (11) with a needle tip (113) for puncturing the skin of the patient and a cannula (12). The cannulation device (1) is characterized in that the puncture needle (11) is movably connected to the cannula (12).