Medical Wire Insulating Electrode for Fusion Release
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Solution Overview
Problem
Conventional medical wires using thermally-fusible polyvinyl alcohol connecting members face issues with incomplete fusion due to reduced resistance and Joule heat generation when intracorporeally indwelling members come into contact with the heating electrode, leading to incomplete separation of the intracorporeally indwelling member during vascular embolization procedures.
Innovation Solution
A medical wire design featuring a non-conductive coating film on the external surface of the electrode-forming portion with exposed cutout portions to prevent electrical connection with intracorporeally indwelling members, ensuring high-frequency current flows only through the body fluid, thereby maintaining adequate resistance and heat generation for complete fusion of the connecting member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a thermally-fusible polyvinyl alcohol connecting member is used to detach the intracorporeally indwelling member, then the operation time is shortened and surgical burdens are lightened, but incomplete fusion occurs when intracorporeally indwelling members contact the heating electrode, reducing reliability
Solution Approach 1:
A non-conductive coating film is introduced as an intermediary layer between the heating electrode and the intracorporeally indwelling member. This coating film prevents direct electrical contact while allowing thermal energy to pass through, ensuring complete fusion of the connecting member even when intracorporeally indwelling members are present in the vicinity.
Solution Approach 2:
A thin non-conductive coating film is applied to the heating electrode surface. This thin film maintains the heating function while preventing electrical short circuits with intracorporeally indwelling members, thereby ensuring reliable and complete fusion of the thermally-fusible connecting member.
2Temperature
If the leading end part of the conductive wire is exposed to facilitate heating, then heat generation is improved, but electrical connection with intracorporeally indwelling members occurs, causing current leakage and incomplete fusion
Solution Approach 1:
The non-conductive coating film serves as a mediator that allows thermal energy transmission while blocking electrical conduction. It enables the heating electrode to generate sufficient heat for complete fusion without creating harmful electrical connections with intracorporeally indwelling members.
Solution Approach 2:
A thin non-conductive film is applied to the heating electrode, maintaining thermal conductivity for effective heating while providing electrical insulation to prevent current leakage to intracorporeally indwelling members.
3Reliability
If high-frequency current is applied to fuse the connecting member, then the intracorporeally indwelling member can be released, but reduced resistance from contact with intracorporeally indwelling members prevents adequate heat generation
Solution Approach 1:
The non-conductive coating film acts as an intermediary that prevents electrical short circuits with intracorporeally indwelling members, maintaining adequate resistance for effective Joule heat generation while still allowing thermal energy to fuse the connecting member.
Solution Approach 2:
The thin non-conductive coating film maintains electrical resistance necessary for adequate Joule heat generation while allowing thermal conduction to complete the fusion process, ensuring reliable release of the intracorporeally indwelling member.
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 effectively prevents current leakage to intracorporeally indwelling members, ensuring complete fusion of the connecting member and reliable release of the intracorporeally indwelling member, reducing the need for repeated procedures and minimizing risks to patients and surgeons.
Implementation Method 1
a non-conductive coating film is formed on an external peripheral surface of an electrode-forming portion
Implementation Method 2
maintaining adequate resistance and heat generation for complete fusion of the connecting member
Implementation Method 3
a thermally-fusible connecting member composed of polyvinyl alcohol... the connecting member is heated and fused by supplying an electric current for fusion
Data Source
AI summary
Disclosed herein is a medical wire with an intracorporeally indwelling member connected to the leading end part of a conductive wire body through a thermally-fusible connecting member, wherein expected heat generation can be achieved even when a conductive member that causes leak comes into contact with the leading end part of the conductive wire body, and thus the intracorporeally indwelling member can be surely released.This medical wire comprises a conductive wire body and an intracorporeally indwelling member connected to the leading end part of the conductive wire body through a thermally-fusible connecting member, in which the connecting member is heated and fused by supplying an electric current for fusion through the conductive wire body, thereby releasing the intracorporeally indwelling member, wherein a non-conductive coating film is formed on an external peripheral surface of an electrode-forming portion in the leading end part of the wire body, and a part of the surface of the wire body is exposed through the coating film, thereby forming a heating electrode portion.