Bioprosthetic Heart Valve Leaflets with Localized Stabilization

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Solution Overview

Problem

Bioprosthetic heart valves made from biological materials face challenges such as calcification, leading to reduced service life, immunogenic reactions, and inadequate mechanical stability, which limits their long-term effectiveness and requires lifelong anticoagulation with mechanical valves.

Innovation Solution

A partial stabilizing treatment is applied to biological tissues, focusing on mechanically stressed points, such as edge regions, using chemical or thermal methods to enhance mechanical stability while maintaining biocompatibility and minimizing surface alteration, allowing for zones with increased mechanical stability without compromising the native properties of the remaining tissue.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the entire surface of biological material is subjected to stabilizing treatment, then mechanical stability is improved, but biocompatibility and native tissue properties are compromised

Engineering Contradiction:

Improvemechanical stabilityVSAvoidimmunogenic reactions

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent applies stabilizing treatment only to specific zones of the biological material surface that experience highest mechanical stress, rather than treating the entire surface uniformly. This creates local differentiation where treated zones gain enhanced mechanical stability while untreated zones maintain native biocompatibility and tissue properties.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements partial stabilizing treatment covering only a proportion of the total surface area, specifically targeting regions subjected to highest mechanical loads. This partial action approach provides sufficient mechanical reinforcement where needed while minimizing the overall impact on biocompatibility and native tissue characteristics.

Inventive Principle:

Principle #16Partial or excessive action

2Strength

If chemical or thermal stabilizing treatment is applied to biological material, then mechanical stability is improved, but the risk of calcification increases

Engineering Contradiction:

Improvemechanical stabilityVSAvoidcalcification

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The patent applies stabilizing treatment selectively to specific surface zones rather than the entire material, creating local differentiation where only high-stress regions undergo chemical or thermal modification. This reduces the overall surface area susceptible to calcification while maintaining mechanical stability where it is most critically needed.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements partial stabilizing treatment covering only a proportion of the total surface area, specifically targeting regions subjected to highest mechanical loads. This partial action provides sufficient mechanical reinforcement while minimizing the overall impact on calcification risk.

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If mechanical valves are used, then durability is improved, but lifelong anticoagulation is required due to blood clotting

Engineering Contradiction:

Improveservice lifeVSAvoidblood clotting

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent creates local differentiation in the biological material where treated zones provide enhanced mechanical stability for durability while untreated zones maintain native biocompatibility properties that reduce thrombogenicity, avoiding the lifelong anticoagulation requirement associated with fully synthetic mechanical valves.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent creates a composite structure combining chemically or thermally treated zones with untreated native biological material zones. This composite approach integrates the mechanical durability benefits of stabilizing treatment with the biocompatibility and anti-thrombogenic properties of native tissue, achieving both longevity and safety without lifelong anticoagulation.

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 approach results in bioprosthetic heart valves with improved long-term mechanical stability, reduced risk of calcification, and minimized immunogenic reactions, enabling extended service life without the need for anticoagulants and maintaining biocompatibility.

Implementation Method 1

The surface of the biological material has one or more zones having an increased mechanical stability, in each case based on a separate stability-increasing treatment of the surface of these zones

Methodology Applied

Scientific EffectChemical crosslinking: Chemical Bonding

Implementation Method 2

The surface of the biological material has one or more zones having an increased mechanical stability, in each case based on a separate stability-increasing treatment of the surface of these zones

Methodology Applied

Scientific EffectThermal treatment: Heating

Data Source

PatentUS9782255B2Bioprosthetic components for an implant, in particular partly crosslinked biological heart valves

Publication Date: 2017.10.10 BIOTRONIK AG

AI summary

Bioprosthetic components based on, or comprising, biological materials for implants, preferably biological heart valves, in particular biological heart valve leaflets, which have only been chemically or thermally stabilized (partly crosslinked) at mechanically stressed points and therefore have zones having different mechanical properties, and to a method for the production thereof.