Ablation Probes With Suction For Atrial Tissue Contact
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Solution Overview
Problem
Conventional ablation techniques for treating atrial fibrillation face challenges in creating complete lesion patterns due to inconsistent tissue contact and convective cooling, leading to incomplete lesions and recurring arrhythmias, with limited understanding of mechanical stress-induced remodeling and its role in atrial fibrillation progression.
Innovation Solution
The integration of suction with coagulation probes ensures consistent tissue contact, allowing for the creation of overlapping lesions on the atrial tissue to reduce mechanical stress and prevent arrhythmia substrates, addressing the limitations of existing thermal ablation systems by enhancing lesion consistency and structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermal ablation systems are used to create lesion patterns, then energy can be applied to cardiac tissue to prevent arrhythmia propagation, but incomplete lesions occur due to inconsistent tissue contact and convective cooling
Solution Approach 1:
A suction device is introduced as an intermediary between the ablation probe and the cardiac tissue. The suction device creates a vacuum that draws tissue into contact with the probe tip, ensuring consistent and reliable tissue contact throughout the ablation process. This mediator resolves the contradiction by providing a mechanism to maintain steady tissue-probe contact without requiring direct mechanical pressure.
Solution Approach 2:
The conventional mechanical pressure application system is replaced with a suction-based vacuum system. Instead of relying on mechanical force to maintain tissue contact, the system uses negative pressure (vacuum) to actively draw tissue toward the probe. This substitution of mechanical action with suction-based action improves tissue contact consistency while reducing operator dependency.
2Reliability
If thermal energy is applied to create complete transmural lesions, then arrhythmia substrates can be eliminated, but convective cooling from blood flow prevents consistent temperature delivery
Solution Approach 1:
The suction device serves as a mediator that improves thermal delivery by first ensuring consistent tissue contact. By drawing tissue into the probe tip, the suction system creates a stable interface for heat transfer, allowing thermal energy to be delivered more reliably through the tissue wall despite the presence of convective cooling from blood flow.
Solution Approach 2:
The system changes the contact parameters between the probe and tissue by using suction to maintain constant tissue engagement. This parameter change (improved contact consistency) allows the thermal ablation system to overcome convective cooling effects and achieve more reliable transmural lesion formation.
3Reliability
If multiple ablation procedures are performed to address atrial fibrillation, then treatment effectiveness can be improved, but mechanical stress on atrial tissue promotes remodeling and new substrate formation
Solution Approach 1:
The suction device is used during the ablation procedure to improve tissue contact consistency, which allows for more precise and controlled lesion creation. This preliminary improvement in contact quality enables the ablation to be more effective in eliminating existing substrates while minimizing unnecessary tissue trauma and stress that would promote remodeling.
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 reduces mechanical stress on atrial tissue, thereby decreasing the occurrence of atrial fibrillation and preventing the formation of new substrates, offering a more durable solution to arrhythmia recurrence compared to traditional methods.
Implementation Method 1
a physician creates a lesion using energy (including but not limited to radiofrequency, D.C., microwave, cryo, laser or other thermal modalities)
Implementation Method 2
The subject coagulation probes for ablation and/or coagulation integrate suction to the coagulation mechanism so as to ensure consistent and intimate tissue contact
Implementation Method 3
blood flowing along the endocardium removes heat thus producing a larger gradient between temperature immediately under the electrodes along the epicardium and that the temperature at the endocardium
Data Source
AI summary
Methods and devices are disclosed herein for therapeutically treating atrial tissue to lessen the effects of mechanical stress on atrial tissue, where reducing mechanical stress in the portion of atrial tissue reduces formation of at least one arrhythmia substrate. In one example, the devices and methods are suitable for minimally invasive surgery. More particularly, methods and devices described herein permit creating an ablation pattern on an organ while reducing excessive trauma to a patient.