Catheter Insertion Device with Dual-Spring Retraction for Compact Height
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Solution Overview
Problem
Existing insulin infusion devices, particularly patch pumps, face challenges in inserting a cannula perpendicularly to the skin while minimizing device height, leading to increased overall size and user discomfort.
Innovation Solution
A manual insertion device with a dual retraction spring configuration using multiple barrel-shaped guides and bosses in the housing, allowing for automatic introducer needle retraction, reducing the number of components and device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single-barrel retraction spring configuration is used, then the device can achieve needle retraction, but the device height and overall size increase
Solution Approach 1:
The patent divides the retraction function into two separate springs (first and second retraction springs) positioned in different barrels. This segmentation allows each spring to be smaller and positioned optimally within the housing, reducing the overall device height while maintaining the needle retraction function.
Solution Approach 2:
The patent transitions from a single-barrel configuration to a multi-barrel configuration, utilizing the radial dimension of the housing to accommodate multiple springs. This dimensional change allows the retraction mechanism to fit within a more compact height profile.
2Length of stationary object
If multiple barrel-shaped guides and bosses are used for dual retraction spring configuration, then device height is reduced, but the device complexity increases
Solution Approach 1:
The barrel-shaped guides and bosses in the housing serve multiple functions: they guide the movement of the catheter and needle, provide mounting positions for the retraction springs, and define the operational boundaries of the insertion mechanism. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The patent combines the guide structures and spring mounting features into an integrated housing design. The barrel-shaped guides and bosses are formed as part of the housing structure itself, merging what would otherwise be separate components into a unified structure.
3Device complexity
If a manual insertion device is used, then device complexity is reduced, but the ease of operation for perpendicular insertion decreases
Solution Approach 1:
The device uses the user's own finger to activate the insertion mechanism through a button that loads and fires the retraction springs. This self-service approach eliminates the need for complex motorized or motor-controlled insertion mechanisms while maintaining ease of operation.
Solution Approach 2:
The button mechanism pre-loads the retraction springs in a controlled manner before the actual insertion event. This preliminary action ensures that the springs are ready to fire at the optimal moment, making the insertion process smooth and easy while keeping the mechanism simple.
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 solution enables a compact, cost-effective, and user-friendly insertion mechanism with automatic needle retraction, minimizing user discomfort and device height, while maintaining a seamless fluid path for insulin delivery.
Implementation Method 1
a dual retraction spring configuration for automatic introducer needle retraction
Data Source
AI summary
A catheter insertion device is provided as an external applicator attachable to a medicine delivery device. The medicine delivery device has an internal module therein that comprises an insertion needle hub and needle, and a catheter hub and catheter. An external applicator comprises a drive and spring that drive a drive pin into the medicine delivery device to force the needle hub and catheter hub downward until the catheter hub locks in the downward position and the needle hub returns into the external applicator. An automatic release feature automatically disengaged the external applicator from the medicine delivery device when insertion is complete.