Biocompatible Cardiac Lead Coating for Thrombus Prevention

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Solution Overview

Problem

Medical leads made from materials like platinum, titanium, and stainless steel are not biocompatible, leading to surface-induced thrombus formation, which is clinically catastrophic when they dislodge and travel in systemic circulation, particularly on the left side of the heart, making left-sided placement risky due to the high risk of thromboembolic complications.

Innovation Solution

An implantable medical electrical lead with an external blood-contacting surface coated with a monolayer of biological agents that promotes endothelialization covalently attached to a polymeric surface, reducing thrombogenic potential by recruiting and retaining endothelial cells, thereby forming an anti-thrombogenic barrier.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If traditional materials (platinum, titanium, stainless steel) are used for lead manufacture, then structural strength and electrical conductivity are improved, but biocompatibility deteriorates leading to surface-induced thrombus formation

Engineering Contradiction:

Improvestructural strengthVSAvoidthrombus formation

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The invention uses a composite structure combining a traditional metal lead core (platinum, titanium, or stainless steel) with a biocompatible polymer coating layer. The metal provides structural strength and electrical conductivity, while the polymer coating (such as silicone rubber or polyurethane) provides biocompatibility and prevents thrombus formation. This composite approach resolves the contradiction by allowing both materials to contribute their advantageous properties.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The polymer coating acts as an intermediary layer between the metal lead and the blood/tissue environment. This intermediate layer isolates the non-biocompatible metal surface from direct contact with blood, preventing thrombus formation while allowing the metal to maintain its structural and electrical functions. The coating serves as a mediator that enables the metal to be used without its harmful effects.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If left-sided cardiac placement is performed with traditional leads, then clinical therapeutic benefit is improved, but risk of thromboembolic complications (stroke) increases substantially

Engineering Contradiction:

Improvetherapeutic benefitVSAvoidthromboembolic complications

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention converts the inherently non-biocompatible property of traditional lead materials into a benefit by applying a specialized coating that not only prevents thrombus formation but also actively promotes endothelialization. The coating transforms the harmful foreign surface into a beneficial bio-integrated surface that reduces stroke risk while maintaining left-sided placement therapeutic benefits.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The invention changes the surface parameters of the lead by applying coatings with specific biochemical properties ( endothelialization-promoting surfaces). This parameter change transforms the surface from thrombogenic to anti-thrombogenic, enabling safe left-sided placement. The surface chemistry and biology are modified to prevent clot formation while maintaining electrical function.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If a polymer coating is applied to the lead surface, then biocompatibility is improved, but manufacturing complexity increases

Engineering Contradiction:

ImprovebiocompatibilityVSAvoidmanufacturing complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The polymer coating is applied during the lead manufacturing process before implantation, establishing the biocompatible surface in advance. This preliminary action ensures that the biocompatibility feature is built-in during production rather than requiring post-manufacturing modifications, thereby managing complexity within the manufacturing workflow.

Inventive Principle:

Principle #10Preliminary action

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 endothelialized surface significantly reduces thrombus formation on the lead, making it suitable for left-sided cardiac placement without increasing the risk of thromboembolic complications, such as stroke, by creating a natural anticoagulant barrier.

Implementation Method 1

a monolayer of at least one biological agent that promotes endothelialization covalently attached to a polymeric lead surface

Methodology Applied

Scientific EffectCovalent bonding: Chemical Bonding

Implementation Method 2

biological agent that promotes endothelialization

Methodology Applied

Scientific EffectEndothelialization:

Data Source

PatentUS9861814B2Medical electrical lead having biological surface and methods of making and using same

Publication Date: 2018.01.09 MEDTRONIC INC

AI summary

An implantable electrical lead suitable for left sided cardiac placement, the implantable medical electrical lead having an external blood contacting surface having an external coating including a monolayer of at least one biological agent that promotes endothelialization covalently attached to a polymeric lead surface.