Guide Catheter Welded Wire Segmentation for Breakage Resistance
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Solution Overview
Problem
Existing guide catheters face challenges in securely delivering stents due to the risk of the catheter and wire breaking when pulled, leading to incomplete or improperly placed stents, as the current designs may cause excessive force that can fracture the catheter during stent deployment.
Innovation Solution
A guide catheter design featuring a metal pipe attached coaxially within a resin tube, with a welded metal wire and a protective resin member, where the wire is welded at a position apart from the most proximal portion, and the protective member is used to minimize the inclination of the catheter's axis during wire pull, reducing the risk of breakage and ensuring secure stent placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the wire is welded to the proximal end of the pipe, then the connection strength is maximized, but the catheter is more prone to breaking during wire pull
Solution Approach 1:
The welding region is segmented away from the most proximal portion of the pipe, creating a separation between the connection point and the proximal end. This segmentation allows the catheter to withstand wire pull forces without breaking at the proximal end, while still maintaining strong connection through the welded region.
Solution Approach 2:
The wire is welded to a region more distal than the proximal end of the pipe before deployment, pre-positioning the connection point to avoid the most proximal portion. This preliminary action prevents the catheter from breaking during subsequent wire pull operations.
2Stability of the object's composition
If the wire is welded at the proximal end of the pipe, then the structural integrity is maximized, but excessive force is applied during stent deployment causing catheter fracture
Solution Approach 1:
The welding region is segmented from the most proximal portion, creating a protective zone that prevents excessive force from directly compromising the structural integrity at the critical proximal end. This segmentation allows the catheter to maintain stability while withstanding deployment forces.
Solution Approach 2:
The welded region acts as an intermediary connection point between the wire and the pipe, positioned distal to the proximal end. This intermediary position allows force transmission while protecting the proximal end from direct stress concentration that would cause fracture.
3Strength
If the welding region is positioned at the proximal end of the pipe, then the wire connection is most secure, but the catheter axis inclines excessively during wire pull
Solution Approach 1:
The welding region is segmented away from the most proximal portion, creating a spatial separation that prevents excessive inclination of the catheter axis during wire pull. This segmentation maintains connection security while controlling the mechanical response to pulling forces.
Solution Approach 2:
The welding region is positioned in a different axial location (distal to the proximal end) rather than at the proximal end itself. This dimensional repositioning changes the mechanical leverage during wire pull, reducing axis inclination while maintaining connection security.
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 enhances the stability and reliability of stent delivery by minimizing the risk of catheter breakage during deployment, ensuring accurate placement of stents without excessive force, and maintaining the structural integrity of the catheter and wire connection.
Implementation Method 1
a metal wire having a distal end portion welded to a region more distal than a proximal end of the pipe on an outer circumferential surface of the pipe
Data Source
AI summary
This guide catheter includes a resin tube having an inner lumen through which a guide wire is insertable; a metal pipe attached to an inside of the tube to be coaxial with the tube; and a metal wire having a distal end portion welded to a region more distal than a proximal end of the pipe on an outer circumferential surface of the pipe. The pipe has a most proximal portion formed in a proximal end surface of the pipe, the most proximal portion is more proximal than other portions of the proximal end surface in a central axis direction of the pipe. A welding region of the wire welded to the pipe is formed on the outer circumferential surface of the pipe and a proximal end of the welding region is positioned apart from the most proximal portion of the pipe in the central axis direction of the pipe.