Protective Pad Assembly for Esophageal Thermal Safety in RF Ablation

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Solution Overview

Problem

Current cardiac ablation technologies face challenges in delivering ablative energy to treat atrial fibrillation while minimizing damage to adjacent tissues, particularly the esophagus, which can lead to complications such as atrioesophageal fistula and phrenic nerve injury.

Innovation Solution

The use of a pad assembly with specific electrical and thermal conductivity properties is placed between the esophagus and the posterior wall of the left atrium, allowing for the safe delivery of radiofrequency electric current to the target tissue while preventing heat transfer to the esophagus, thereby reducing the risk of injury to adjacent tissues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If radiofrequency ablation is applied to treat atrial fibrillation, then the effectiveness of treating cardiac conditions is improved, but the risk of damaging adjacent tissues such as the esophagus increases

Engineering Contradiction:

Improveeffectiveness of treating atrial fibrillationVSAvoiddamage to adjacent tissues

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A protective pad assembly is introduced as an intermediary component between the ablation electrode and the esophagus. This pad assembly selectively blocks thermal energy transfer to the esophagus while allowing the ablation current to effectively treat the atrial tissue, thus resolving the contradiction between treatment effectiveness and tissue safety

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The harmful thermal effect is extracted and isolated from the ablation process by introducing a thermal barrier pad. The pad absorbs and dissipates thermal energy before it can reach the esophagus, separating the useful ablation function from the harmful thermal side effect

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If ablative energy is delivered to the posterior wall of the left atrium, then electrical isolation of pulmonic veins is achieved, but the esophagus is at risk of thermal injury

Engineering Contradiction:

Improveelectrical isolation of pulmonic veinsVSAvoidesophageal temperature

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The protective pad assembly serves as a thermal mediator placed between the posterior wall of the left atrium and the esophagus. It allows the ablation current to pass through to achieve electrical isolation while blocking thermal conduction to keep esophageal temperature below 50°C

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The pad assembly changes the thermal parameters of the system by introducing a material with specific thermal conductivity properties. This modifies the heat transfer pathway to protect the esophagus while maintaining the effectiveness of the ablation procedure

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If a protective pad is placed between the esophagus and atrial wall, then thermal protection of the esophagus is improved, but the complexity of the procedure increases

Engineering Contradiction:

Improvethermal protection of esophagusVSAvoidprocedure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The protective pad assembly is designed as a flexible, thin-film structure that can be easily conforming to the anatomical curvature between the esophagus and atrial wall. This flexibility simplifies the placement and removal process, reducing the procedural complexity despite adding protective functionality

Inventive Principle:

Principle #30Flexible shells and thin films

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

This approach effectively delivers ablative energy to the target tissue while maintaining the esophagus at a safe temperature below 50°C, reducing the incidence of complications and enabling safer electrical isolation of pulmonary veins and other areas.

Implementation Method 1

the pad assembly blocks thermal energy transfer from the ablated tissue to the esophagus, maintaining the esophagus at a safe temperature below 50°C

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Implementation Method 2

Electromagnetic radio frequency ('RF') energy applied by the electrode heats and eventually kills or ablates the tissue to form a lesion

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS10751122B2Protective systems and methods for use during ablation procedures

Publication Date: 2020.08.25 ATRICURE INC

AI summary

Systems and methods provide protection for patient tissue during radiofrequency ablation treatments. Exemplary techniques involve placing a conductive or semiconductive pad assembly near a target tissue, and administering electrical current through the target tissue while protecting adjacent tissue with the pad assembly. The pad assembly may include a material having an electrical conductivity value that is equal to or greater than the electrical conductivity value of the target tissue.