Cylindrical embedded material for medical use

Solution Overview

Problem

Conventional artificial blood vessels with knitted structures have low blood leakage resistance due to high porosity, and existing solutions fail to effectively improve this resistance while maintaining porosity for needle penetration.

Innovation Solution

A cylindrical embedded material with a stockinette stitch structure, where fibers are bundled and covered with resin to create a spacing that narrows under external force and self-restores, enhancing blood leakage resistance without impairing porosity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a knitted structure with high porosity is used, then needle penetration is facilitated, but blood leakage resistance performance deteriorates

Engineering Contradiction:

Improveneedle penetrationVSAvoidblood leakage resistance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The artificial blood vessel is divided into multiple strata: a knitted base layer providing porosity and needle penetration, a resin coating layer providing blood leakage resistance, and welded reinforcement portions providing localized structural support. Each layer performs its specific function without compromising the others.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The resin coating is applied selectively at specific locations (yarn joint portions and seam portions) rather than uniformly across the entire surface. This localized coating approach maintains high porosity in most areas for needle penetration while providing blood leakage resistance precisely where structural weaknesses exist.

Inventive Principle:

Principle #3Local quality

Solution Approach 3:

Yarns are pre-welded at joint portions and seam portions before final resin coating application. This preliminary welding creates a reinforced skeleton that maintains structural integrity and blood leakage resistance even before the resin coating is applied.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the entire outer peripheral surface is coated with urethane elastomer, then blood leakage prevention is improved, but porosity is impaired and needle puncture difficulty increases

Engineering Contradiction:

Improveblood leakage preventionVSAvoidneedle puncture

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The resin coating is applied selectively at specific locations (yarn joint portions and seam portions) rather than uniformly across the entire surface. This localized coating approach maintains high porosity in most areas for needle penetration while providing blood leakage resistance precisely where structural weaknesses exist.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of coating the entire surface with resin (excessive action), only critical areas requiring blood leakage prevention are coated (partial action). This reduces resin usage and maintains porosity in non-critical areas while still achieving adequate blood leakage prevention at vulnerable points.

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If a yarn is welded at a part of yarn joint portion, then blood leakage resistance is improved, but needle hole closure after puncture deteriorates

Engineering Contradiction:

Improveblood leakage resistanceVSAvoidneedle hole closure

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The resin coating is applied selectively at specific locations (yarn joint portions and seam portions) rather than uniformly across the entire surface. This localized coating approach maintains high porosity in most areas for needle penetration while providing blood leakage resistance precisely where structural weaknesses exist.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention combines multiple materials with complementary properties: natural or synthetic yarns providing flexibility and porosity, resin coating providing blood leakage resistance at critical points, and the composite structure maintaining both structural integrity and self-closure capability through the combination of these materials.

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 material achieves improved blood leakage resistance while allowing for easy needle penetration and self-repair of needle holes, maintaining high porosity and resistance performance.

Implementation Method 1

the covering part has elasticity which allows for movement of the fibers to narrow the spacing part when an external force is applied to the structure body element and allows for restoration of positions of the moved fibers when the external force is removed

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS20230055178A1Cylindrical embedded material for medical use

Publication Date: 2023.02.23 HI-LEX CORPORATION

AI summary

Provided is a cylindrical embedded material for medical use, in which a plurality of structure bodies are connected in an axial direction, wherein the structure body elements each have an enclosure part configured for enclosing inside thereof, wherein the cylindrical embedded material connection part in which a structure body element of a first structure body and a structure body element of a second structure body connected in the axial direction, wherein the enclosure part has a spacing part to separate the fibers, wherein the cylindrical embedded material has a covering part, and wherein the covering part has elasticity which allows for movement of the fibers to narrow the spacing part when an external force is applied to the structure body element and allows for restoration of positions of the moved fibers when the external force is removed.