PAR Ablation Catheter Radial-Linear Lesion Formation
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Solution Overview
Problem
Current ablation catheters face challenges in precisely forming radial-linear lesions around the pulmonary vein antrum region, which is crucial for effective treatment of atrial fibrillation.
Innovation Solution
The development of a pulmonary vein antrum radial-linear (PAR) ablation catheter with an elongate shaft structure and a distal tip ablation region featuring a spline and an ablation element, configured to form radial-linear lesions in or near pulmonary vein antral tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a catheter is manipulated through vasculature to the heart for ablation therapy, then treatment can be delivered to the pulmonary vein antrum region, but precise control of the catheter during manipulation and lesion formation becomes difficult
Solution Approach 1:
A spline is introduced as an intermediary element that interfaces between the catheter and the tissue. The spline acts as a mediator that receives the catheter and positions it against the pulmonary vein antrum tissue, enabling precise lesion formation without requiring complex manual manipulation of the catheter itself. The spline serves as the primary interface for both positioning and energy delivery.
Solution Approach 2:
The ablation system is divided into separate functional components: the catheter for delivery, the spline for positioning and tissue interface, and the ablation element for energy delivery. This segmentation allows each component to be optimized independently - the catheter for navigability through vasculature, the spline for precise positioning, and the ablation element for effective tissue modification.
2Reliability
If radial-linear lesions are formed around the pulmonary vein antrum, then treatment effectiveness for atrial fibrillation is improved, but the complexity of the ablation device increases
Solution Approach 1:
The ablation element is designed to be movable along the spline, enabling dynamic adjustment of the lesion pattern. By sliding the ablation element to different positions on the spline, radial-linear lesions can be formed at various locations around the pulmonary vein antrum. This dynamic capability allows flexible lesion formation without requiring multiple fixed ablation elements, thereby managing device complexity while maintaining treatment effectiveness.
Solution Approach 2:
The spline serves multiple functions: it acts as a structural support, a positioning mechanism, a guide for the ablation element, and a tissue interface. This multi-functionality reduces the need for separate components, thereby managing device complexity while enabling the formation of effective radial-linear lesions for treating atrial fibrillation.
3Reliability
If circumferential ring-type lesions are formed around pulmonary vein ostia, then pulmonary vein isolation can be achieved, but the treatment may not be as effective for certain arrhythmia patterns
Solution Approach 1:
The movable ablation element enables dynamic lesion formation patterns. By positioning the ablation element at different locations along the spline and delivering energy at multiple positions, radial-linear lesions can be created that extend beyond the immediate ostial region. This dynamic capability allows adaptation to different arrhythmia patterns and anatomical variations, improving treatment versatility and effectiveness compared to fixed circumferential lesions.
Solution Approach 2:
The lesion pattern transitions from two-dimensional circumferential rings at the ostia to three-dimensional radial-linear lesions that extend into the antral tissue. This dimensional change allows the ablation to address arrhythmia substrates in multiple spatial dimensions, improving adaptability to different arrhythmia patterns and anatomical configurations.
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 PAR ablation catheter effectively creates radial-linear lesions, potentially offering a more effective treatment for atrial fibrillation by precisely disrupting electrical pathways in the pulmonary vein antrum region.
Implementation Method 1
treatment may include radio frequency (RF) ablation
Implementation Method 2
at least one thermally conductive ablating region configured to form radial-linear lesions
Implementation Method 3
the energy transfer balloon comprises at least one thermally conductive ablating region configured to form radial-linear lesions
Data Source
AI summary
Devices and methods for creating radial-linear lesions in pulmonary vein antral tissue are disclosed. In an embodiment, a device includes an elongate shaft structure with a distal tip ablation region including a spline and an ablation element slidably coupled to the spline. The ablation element includes at least one of an ultrasound emitter, a high frequency ultrasound emitter, a laser, a radiofrequency electrode, a virtual radiofrequency electrode, or a cryogenic source. A backing balloon may be configured to push or pull the spline and the ablation element toward or against the pulmonary vein antral tissue. In an embodiment, the distal tip ablation region includes a splineless cryoballoon with at least one thermally conductive region.