Cannulation Device Needle 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 puncture and removal procedures.
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 inside the cannula, featuring a movable connection along the longitudinal axis, and secured by connecting elements to lock the needle in safety or puncture positions, enabling safe handling and use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the needle tip protrudes out of the cannula for easy puncture access, then the puncture function is improved, but the user safety deteriorates due to risk of accidental injury and infection transmission
Solution Approach 1:
The puncture needle is nested inside the cannula when not in use, with the needle retraction device allowing it to be pulled back into the cannula's interior space. This nesting arrangement protects the needle tip from exposing users to harmful factors while maintaining puncture capability when needed.
Solution Approach 2:
The needle position is made dynamic rather than static - it can protrude from the cannula during puncture operations and retract inside the cannula during storage and transport. The retraction device enables this dynamic positioning, allowing the system to adapt between operational and safety states.
2Object-affected harmful factors
If the needle tip is covered inside the cannula for safety, then user safety is improved, but the puncture capability deteriorates due to reduced access
Solution Approach 1:
The needle position transitions from static (either always exposed or always covered) to dynamic, allowing it to protrude from the cannula during puncture operations and retract inside during storage. This dynamic positioning resolves the contradiction by providing both safety and puncture capability at different operational stages.
Solution Approach 2:
The needle is pre-positioned inside the cannula in a retracted state for safety during storage and transport. When puncture is needed, the needle is deliberately extended outward using the retraction device, preparing the system for its puncture function only when required.
3Device complexity
If the needle holder and cannula holder are fixed relative to each other for structural simplicity, then device complexity is reduced, but the ability to control needle exposure deteriorates
Solution Approach 1:
The connection between needle holder and cannula holder is made movable rather than fixed, allowing relative motion between the two components. This dynamic connection enables controlled extension and retraction of the needle relative to the cannula while maintaining a relatively simple overall structure through guided linear movement.
Data Source
Figure 1
Figure 2~3
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).