Cannula Insertion Device with Spring-Driven Needle Retraction
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Solution Overview
Problem
Existing cannula insertion methods are uncomfortable for patients due to manual needle penetration and withdrawal, and require obtrusive tubing connections to infusion devices.
Innovation Solution
A device that automatically inserts and withdraws a cannula using a drive mechanism with a retraction spring, allowing the needle to quickly penetrate and retract while maintaining the cannula in place, and automatically aligns the cannula lumen with an infusion device channel for fluidic communication without separate tubing connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual needle penetration and withdrawal is used, then the insertion procedure can be performed, but patient comfort deteriorates and procedural anxiety increases
Solution Approach 1:
The device performs automatic needle penetration and withdrawal without requiring manual operation by the practitioner. The spring mechanism automatically drives the needle forward and then retracts it, making the system self-serving and eliminating the need for manual manipulation that causes patient discomfort and anxiety.
Solution Approach 2:
The spring is pre-loaded in the retracted position before use. This preliminary storage of mechanical energy allows the needle to be rapidly driven forward and then quickly retracted without requiring manual intervention during the actual insertion and withdrawal process, improving patient comfort.
2Reliability
If separate tubing connections are used to connect cannula to infusion device, then fluidic communication is established, but device complexity increases and tubing becomes obtrusive
Solution Approach 1:
The device merges the cannula, needle, spring mechanism, and infusion device connection into a single integrated assembly. The cannula is carried on the needle, and the entire assembly is driven by the spring mechanism, eliminating the need for separate tubing connections and reducing overall device complexity.
Solution Approach 2:
The spring-driven mechanism serves multiple functions: it drives the needle forward for penetration, maintains the needle in the extended position during insertion, and automatically retracts the needle after insertion. This multi-functionality eliminates the need for separate mechanisms for each action, reducing device complexity.
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 provides a more comfortable insertion and withdrawal process for patients by quickly removing the needle and maintaining the cannula, while minimizing tubing and complications in connecting to infusion devices, enhancing patient comfort and reducing procedural anxiety.
Implementation Method 1
a retraction spring, which is prestressed in the retracted position of the needle, to transform to a compressed state in the extended position of the needle
Implementation Method 2
the retraction spring can be used to force the needle from the extended position into the retracted position
Data Source
AI summary
A cannula insertion device includes a housing defining an opening for receiving therethrough a cannula and further defining a channel, and a cannula forming a lumen, the cannula adapted for sliding movement within the housing from a retracted position to an extended position. When the cannula is in the retracted position, the lumen is located remotely from the channel and the channel is in fluidic communication with the opening. When the cannula is in the extended position, the lumen is in fluidic communication with the channel.