Deformed Conductive Rod for Uniform Catheter Coating
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Solution Overview
Problem
Existing methods for electrostatic spray coating of insulating tubular bodies, such as medical catheters, face challenges in achieving uniform coating due to incomplete contact between the coating material and the conductive member, leading to non-uniform application and potential damage to the tubular body.
Innovation Solution
A deformed cross-sectional shape for the rod-like conductive member is used to ensure secure contact with the elastic tubular body, allowing for effective electric charge transfer and preventing repulsion of the coating material, thereby ensuring uniform coating application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rod-like conductive member is inserted into an elastic tubular body for electrostatic spray coating, then electric charge transfer is enabled and coating uniformity is improved, but the tubular body may be damaged due to incomplete contact between the conductive member and the tubular body
Solution Approach 1:
The conductive member is designed with an asymmetric deformed cross-sectional shape that creates multiple contact points with the inner circumferential surface of the tubular body. This asymmetric deformation ensures secure electrical contact while distributing mechanical stress across multiple points, preventing damage to the tubular body during electrostatic spray coating.
Solution Approach 2:
The cross-sectional shape of the conductive member is changed from a standard circular shape to a deformed shape with specific geometric parameters. This parameter change optimizes the contact area and distribution between the conductive member and the tubular body, ensuring both secure electrical contact and mechanical safety.
2Manufacturing precision
If a deformed cross-sectional shape is used for the conductive member to ensure secure contact, then coating uniformity is improved, but the device complexity increases
Solution Approach 1:
The conductive member employs a deformed cross-sectional shape with asymmetric geometry that creates optimal contact points with the tubular body. This asymmetric design achieves uniform coating distribution while maintaining relatively simple manufacturing processes for the conductive member itself.
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 method ensures uniform coating application along the circumferential direction of the tubular body, reducing the risk of damage and improving coating efficiency by securely transferring electric charges and preventing repulsion of the coating material.
Implementation Method 1
a coating material charged to a second electrical potential is applied to the elastic tubular body... the charged coating material applies to the elastic tubular body by an electrostatic force
Implementation Method 2
the rod-like conductive member has a deformed cross-sectional shape in a direction vertical to an axial direction... ensuring secure contact with the elastic tubular body
Data Source
AI summary
A method for manufacturing an elastic tubular body, comprises a first step of inserting a rod-like conductive member 2 into an elastic tubular body 1; a second step of giving a first electrical potential to the rod-like conductive member 2; and a third step of applying a coating material 31 charged to a second electrical potential to the elastic tubular body 1; wherein the rod-like conductive member 2 has a deformed cross-sectional shape in a direction vertical to an axial direction.