Support Catheter Shaft Adhesive Bonding
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Solution Overview
Problem
In percutaneous coronary intervention, the joint portion of catheters where the insertion tube and wire are joined tends to bend when the distal end is pushed into a coronary artery, leading to inefficient transmission of push-in force between the wire and insertion tube, causing the hook-shaped portion to slide and reduce the effectiveness of force transmission.
Innovation Solution
A support catheter with a distal shaft and a proximal shaft joined using a modified polyolefin-based adhesive, ensuring the distal end portion is securely fixed to the outer peripheral surface of the shaft body, preventing sliding and maintaining effective force transmission even when the catheter is bent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the catheter is pushed and pulled repeatedly with a clearance between the catheter and guiding catheter, then the catheter can be maneuvered into position, but the hook-shaped portion slides between the tubes causing push-in force to be inefficiently transmitted
Solution Approach 1:
The patent introduces a cover tube as an intermediary component that wraps around the insertion tube and secures the hook-shaped portion. This mediator prevents direct sliding between the hook-shaped portion and the insertion tube while allowing the catheter to be maneuvered, thus resolving the contradiction between ease of operation and force transmission efficiency
Solution Approach 2:
The patent combines the cover tube with the insertion tube to form an integrated structure where the cover tube is thermally shrunk onto the insertion tube. This merging creates a unified assembly that maintains both maneuverability and secure force transmission through the combined structure
2Reliability
If the hook-shaped portion is tightly secured to prevent sliding, then force transmission improves, but the catheter structure becomes more complex
Solution Approach 1:
The patent utilizes thermal shrinkage as a parameter change to secure the cover tube onto the insertion tube. By applying heat to change the dimensional parameters of the cover tube material, the structure is simplified while still achieving reliable force transmission through the thermally shrunk connection
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
This configuration suppresses the occurrence of sliding between the proximal and distal shafts, ensuring consistent and efficient transmission of push-in force, reducing the risk of catheter rupture and maintaining functionality during repeated use.
Implementation Method 1
The proximal shaft is joined to a proximal-side portion of the distal shaft by a modified polyolefin-based adhesive
Data Source
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AI summary
A support catheter (1) is used together with a guiding catheter 4 in which a treatment catheter (5) is inserted, the guiding catheter 4 guiding the treatment catheter (5) in a blood vessel, the support catheter (1) being inserted in the guiding catheter (4) from a proximal-side opening of the guiding catheter (4) and having such a length that the support catheter (1) protrudes from a distal-side opening of the guiding catheter (4), the support catheter (1) guiding a distal end portion of the treatment catheter (5) to a treatment site. The support catheter (1) includes: a distal shaft (33) forming a distal-side portion of the support catheter, the distal shaft (33) having a tubular shape such that the treatment catheter (5) is insertable in the distal shaft (33); and a proximal shaft (34) forming a proximal-side portion of the support catheter (1). The proximal shaft (34) is joined to a proximal-side portion of the distal shaft (33) by a modified polyolefin-based adhesive.