Bilateral Atrial Ablation Devices for Electrical Isolation
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Solution Overview
Problem
Current treatments for atrial fibrillation, such as the MAZE III procedure, have limitations in effectively addressing the condition, particularly in providing advantages over existing techniques and ensuring comprehensive electrical isolation of the atria.
Innovation Solution
The development of devices and systems that utilize tissue-affecting elements to form lesions between opposite surfaces of the atria, employing magnetic components, temperature sensors, and various ablation energies like cryogenic, HIFU, RF, and laser energy to ablate tissue from both endocardial and epicardial surfaces, allowing for simultaneous or sequential ablation to electrically isolate the left atrial appendage and pulmonary veins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional MAZE III procedure is used to create electrical maze in atrium, then some efficacy is achieved in treating atrial fibrillation, but the treatment effectiveness is insufficient and additional advantages over existing techniques are needed
Solution Approach 1:
The treatment approach segments the atrial tissue into distinct regions requiring isolation, specifically targeting the left atrial appendage and pulmonary veins as separate zones. By dividing the ablation strategy into discrete segments (appendage isolation, pulmonary vein isolation, and inter-atrial isolation), the system achieves comprehensive electrical isolation more effectively than traditional single-procedure approaches
Solution Approach 2:
The patent introduces a transverse dimension to ablation by positioning tissue-affecting elements on opposite sides of the atrial wall (endocardial and epicardial surfaces). This cross-wall approach creates lesions that span the entire tissue thickness, adding a dimensional aspect to isolation that traditional single-surface ablation cannot achieve
2Reliability
If devices are positioned on opposite sides of tissue to form comprehensive lesions, then electrical isolation is improved, but device positioning complexity increases
Solution Approach 1:
Magnetic components serve as intermediaries to facilitate positioning between devices on opposite sides of the tissue. The magnetic attraction force enables precise alignment and positioning of the tissue-affecting elements without requiring complex mechanical positioning systems, thereby reducing overall device complexity while maintaining effective electrical isolation
Solution Approach 2:
Temperature sensors provide real-time feedback on tissue conditions during ablation, enabling dynamic adjustment of device positioning and energy delivery. This feedback mechanism ensures optimal lesion formation while simplifying the positioning process through automated adjustment rather than manual precision
3Adaptability or versatility
If multiple ablation energies (cryogenic, HIFU, RF, laser) are used to ablate tissue, then treatment versatility is improved, but energy delivery system complexity increases
Solution Approach 1:
The tissue-affecting elements are designed with multi-functionality, capable of delivering multiple ablation energy types (cryogenic, HIFU, RF, laser) through a unified device architecture. This universal design allows a single device platform to perform various ablation functions by changing energy delivery mechanisms, thereby achieving treatment versatility without proportionally increasing system complexity
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 enables effective electrical isolation of the left atrium and pulmonary veins, potentially improving treatment outcomes for atrial fibrillation by forming comprehensive lesions that reduce arrhythmic activity, while also allowing for closure and occlusion of the left atrial appendage to prevent thrombosis.
Implementation Method 1
Some variations of the first and second devices may comprise one or more magnetic components
Implementation Method 2
The first and second devices may also comprise one or more temperature sensors
Implementation Method 3
the tissue-affecting elements may ablate tissue using cryogenic substances
Implementation Method 4
the tissue-affecting elements may ablate tissue using high intensity focused ultrasound (HIFU)
Implementation Method 5
the tissue-affecting elements may ablate tissue using radiofrequency (RF) energy
Implementation Method 6
the tissue-affecting elements may ablate tissue using lasers
Data Source
AI summary
Described here are systems and methods for affecting tissue within a body to form a lesion. Some systems comprise tissue-affecting devices, devices that guide the advancement of the tissue-affecting elements to a target tissue region, devices that locate and secure tissue, and devices that help position the tissue-affecting devices along the target tissue. The methods described here comprise advancing a first tissue-affecting device to a first surface of a target tissue, advancing a second tissue-affecting device to a second surface of the target tissue, and positioning the first and second devices so that a lesion may be formed in the tissue between them. In some variations, the devices, systems, and methods described here are used to treat atrial fibrillation by ablating fibrillating tissue from an endocardial surface and an epicardial surface of a heart. Methods of closing, occluding, and/or removing the left atrial appendage are also described.