Mediastinal Protection Balloon for Cardiac Ablation Safety
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Solution Overview
Problem
Catheter ablation for atrial fibrillation often results in complications such as esophageal injury due to the close proximity of the esophagus to the heart, leading to incomplete treatment and potential fatal outcomes, as existing methods like fluoroscopic contrast visualization and temperature monitoring are insufficient in preventing collateral damage.
Innovation Solution
A method involving a protection member, such as an expandable balloon or basket, is placed between the mediastinal structures and the heart to prevent injury, allowing for safe ablation by expanding the space and applying therapeutic substances or chilling to minimize risk, while enabling full energy delivery during cardiac tissue ablation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluoroscopic contrast visualization and temperature monitoring are used to detect and avoid esophageal injury, then esophageal injury detection capability is improved, but the ability to deliver full energy during ablation is compromised due to limiting energy delivery near the esophagus
Solution Approach 1:
A protection member (balloon or basket) is positioned between the ablation catheter and the esophagus to physically separate these structures. This intermediary device allows full-energy ablation to proceed while the protection member absorbs or deflects thermal energy, preventing direct thermal injury to the esophagus. The protection member thus mediates between the ablation energy source and the vulnerable esophageal tissue.
Solution Approach 2:
The protection member is deployed in advance before high-energy ablation is applied to the left atrial posterior wall. By pre-positioning this protective barrier, the system prepares the field for full-energy ablation without risking esophageal injury, eliminating the need to limit energy delivery while maintaining safety.
2Reliability
If full energy is delivered during cardiac tissue ablation to ensure complete treatment, then treatment effectiveness is improved, but the risk of collateral damage to mediastinal structures increases
Solution Approach 1:
The protection member serves as a thermal barrier that absorbs excess heat and protects mediastinal structures from collateral thermal damage. This allows the ablation catheter to deliver full therapeutic energy to the cardiac tissue while the protection member intercepts and dissipates harmful thermal energy before it can reach vulnerable mediastinal structures.
Solution Approach 2:
The protection member is positioned in advance to create a protective buffer zone between the ablation site and mediastinal structures. This pre-positioned cushioning absorbs thermal energy and prevents it from reaching critical structures, enabling full-energy ablation without increasing the risk of collateral damage.
3Object-affected harmful factors
If energy delivery is limited near the esophagus to prevent thermal injury, then esophageal safety is improved, but arrhythmia treatment success rate deteriorates due to incomplete ablation
Solution Approach 1:
The protection member enables full-energy ablation by acting as a thermal shield between the ablation catheter and the esophagus. This intermediary device removes the need to limit energy delivery, allowing complete and effective ablation of arrhythmia-causing tissue while the protection member prevents thermal injury to the esophagus.
Solution Approach 2:
By pre-deploying the protection member before ablation, the system eliminates the constraint of energy limitation. The protection member is in place to absorb thermal energy, allowing the ablation to proceed at full power to ensure complete treatment of the arrhythmia while preventing esophageal injury.
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 minimizes the risk of collateral damage to mediastinal structures like the esophagus, allowing for successful atrial fibrillation treatment without the need for retreating or lifelong drug therapy, ensuring complete energy delivery during catheter ablation.
Implementation Method 1
expanding the protection member
Implementation Method 2
chilling the heart with the protection member. The protection member can comprise a balloon containing chilled fluid
Implementation Method 3
ablating cardiac tissue
Data Source
AI summary
Devices and methods are disclosed for preventing injury to a target tissue in proximity to the heart. The methods may include the use a device to externally manipulate the heart to move a portion of the heart away from the target tissue. The methods may also include applying therapy to the heart with the device.