Segmented Catheter Coating for Friction Reduction at Bends

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Solution Overview

Problem

Tubular medical devices, such as catheters, experience high frictional forces during vascular navigation, particularly at angled or bent sections, making navigation difficult and reducing stability.

Innovation Solution

Applying a lubricious coating specifically to the angled or bent sections of catheters, comprising a base coat and a top coat, where the base coat adheres to the thermoplastic polymer surface and the top coat provides lubricity, reducing friction while maintaining stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If hydrophilic coating is applied to the entire distal section of the catheter, then friction is reduced, but stability is reduced

Engineering Contradiction:

Improvefriction reductionVSAvoidcatheter stability

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The patent applies lubricious coating only to specific high-friction sections of the catheter (such as angled or bent sections) rather than the entire distal section. This localized application reduces friction where needed while preserving catheter stability in other areas, resolving the contradiction between ease of operation and stability.

Inventive Principle:

Principle #3Local quality

2Ease of operation

If lubricious coating is applied to reduce friction, then ease of navigation is improved, but coating application complexity increases

Engineering Contradiction:

Improveease of navigationVSAvoidcoating application complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The catheter coating is segmented into multiple functional layers including a base coat layer and a lubricious top coat layer. This segmentation allows each layer to perform its specific function (adhesion and lubrication respectively) while simplifying the overall application process through standardized multi-layer coating procedures.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses composite coating structures combining different materials with complementary properties. The base coat provides strong adhesion to the catheter surface, while the lubricious top coat (containing materials like polyethylene glycol or hydrophilic polymers) provides low friction. This composite approach achieves both ease of navigation and manageable application complexity.

Inventive Principle:

Principle #40Composite materials

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 lubricious coating significantly reduces friction between the catheter and vessel walls, enhancing trackability and stability during vascular navigation.

Implementation Method 1

The base coat is designed to adhere to the catheter and provide binding sites for the attachment of the top coat

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

The top coat is designed to adhere to the base coat and provide lubricity to reduce the frictional forces created when the catheter is moved in the vasculature

Methodology Applied

Scientific EffectLubrication: Lubrication