Needle Insertion Device Dual Return Mechanism
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Solution Overview
Problem
Existing needle insertion devices are complex and bulky due to the use of a single torsion spring and complex axis arrangements, requiring manual retraction and complicating the assembly process.
Innovation Solution
A needle insertion device utilizing two separate prestressed return means to facilitate the movement of the needle housing from pre-insertion to insertion and retraction positions, eliminating the need for a torsion spring and complex axis arrangements, and allowing for automatic retraction and optimized movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single torsion spring and complex axis arrangement are used, then the needle insertion function is achieved, but the device becomes complex and bulky
Solution Approach 1:
The patent divides the return function into two separate return means: a first return means for moving the needle housing from pre-insertion to insertion position, and a second return means for moving the needle housing from insertion to retracted position. This segmentation eliminates the need for a single complex torsion spring system and reduces overall device complexity while maintaining reliable operation.
Solution Approach 2:
The patent extracts and removes the complex torsion spring mechanism from the device. Instead of using a single torsion spring with multiple axes and camways, the invention uses two simpler return means that can be directly compressed between components, eliminating the need for complex axis arrangements and camway mechanisms.
2Ease of manufacture
If a single torsion spring with camway is used, then the needle insertion function is achieved, but the assembly process becomes complicated
Solution Approach 1:
The patent segments the return mechanism into two independent return means, each with its own compression path. The first return means is compressed between the receiving body and catheter holder, while the second return means is compressed between the catheter holder and needle housing. This segmentation simplifies the assembly process by eliminating the need to assemble and adjust a single complex torsion spring system with multiple axes and camways.
3Ease of operation
If manual retraction is required, then the device structure can be simplified, but the ease of operation is reduced
Solution Approach 1:
The patent implements automatic retraction through the second return means, which is configured to be compressed between the catheter holder and the needle housing. When the needle housing is in the insertion position, the second return means automatically drives the needle housing back to the retracted position without requiring manual intervention. This self-service mechanism improves ease of operation while adding only minimal structural 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 device is simpler, more compact, and easier to use, with automatic retraction and reduced assembly complexity, enabling efficient and precise needle insertion and retraction.
Implementation Method 1
a first return means, configured to be stressed when the needle housing is in the pre-insertion position and to drive the needle housing from the pre-insertion position to the at least one insertion position in released state
Implementation Method 2
a second return means, configured to be stressed when the needle housing is in the pre-insertion position and in the at least one insertion position and to drive the needle housing from the at least one insertion position to the at least one retracted position in released state
Data Source
AI summary
The insertion device has a support wall on the site, a receiving body having a guiding housing, the needle housing, on which an insertion needle is mounted, movably mounted in the guiding housing between a pre-insertion position, at least one insertion position and at least one retracted position, a first return means stressed when the needle housing is in the pre-insertion position and driving the needle housing from the pre-insertion position to the at least one insertion position in released state, a second return means, stressed when the needle housing is in the pre-insertion position and in the at least one insertion position and driving the needle housing from the at least one insertion position to the at least one retracted position in released state.