Hypodermic Interface Assembly Controlled Separation
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Solution Overview
Problem
Existing hypodermic interface assemblies face challenges in enhancing performance and cost-effectiveness, particularly in the controlled separation of components to prevent cannula breakage during use.
Innovation Solution
A hypodermic interface assembly design featuring a cannula, a cannula carrier non-removably connected to the cannula, and an adhesive connection, allowing controllable separation from the hub, with the cannula carrier including leg portions and a barb portion that fits into a groove in the hub, ensuring predictable separation and minimizing cannula loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cannula is firmly secured to the hub, then the connection strength is improved, but the difficulty of controlled separation increases
Solution Approach 1:
The system is divided into three main segments: the hub, the cannula carrier, and the cannula. The cannula carrier acts as an intermediate component that can be non-removably connected to the cannula while being controllably separable from the hub. This segmentation allows the connection strength between cannula and carrier to be high (preventing separation during insertion), while the connection between carrier and hub can be designed for controlled separation under specific forces.
Solution Approach 2:
The connection between the cannula carrier and hub is designed to be dynamic rather than static. The carrier can be non-removably connected during the insertion phase to ensure firm attachment, but can be controllably separated when specific forces are applied (such as during removal). This dynamic behavior resolves the contradiction by allowing the system to transition between strongly connected and separable states as needed.
2Reliability
If the cannula is non-removably connected to the carrier, then the reliability of connection is improved, but the complexity of the device increases
Solution Approach 1:
The cannula and cannula carrier are non-removably connected as a single integrated unit, merging these two components into a reliable assembly. This merging ensures that the cannula cannot separate from the carrier during use, improving connection reliability. The hub then interfaces with this merged unit, allowing controlled separation of the carrier-hub assembly while maintaining the integrity of the cannula-carrier connection.
3Ease of operation
If the hub and carrier are controllably separable, then the ease of removal is improved, but the risk of unintended separation increases
Solution Approach 1:
The system incorporates preliminary anti-action by designing the carrier-hub connection to remain stable under normal operating forces (preventing unintended separation during insertion and fluid delivery), while simultaneously being designed to separate controllably when specific removal forces are applied. This dual-design approach ensures that the connection is both stable during use and easily separable when needed, resolving the contradiction between ease of removal and connection stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enables controlled and predictable separation of the cannula carrier from the hub, preventing cannula breakage and facilitating easy removal from the subject, thus enhancing usability and reducing the risk of cannula loss.
Implementation Method 1
an adhesive connecting the cannula to the cannula carrier
Implementation Method 2
the at least one leg portion of the cannula carrier may include a barb portion, and the hub may include a groove that is sized to receive the barb portion of the at least one leg portion
Implementation Method 3
an outer surface of the cannula may be secured to an inner surface that defines the hub passage extending through the hub and a cannula carrier passage extending through the cannula carrier
Data Source
AI summary
A hypodermic interface assembly is disclosed. The hypodermic interface assembly includes a hub, a cannula, and a cannula carrier. The cannula carrier is non-removably-connected to the cannula. The cannula carrier is controllably separable from the hub.