Particle Beam Cardiac Ablation With Motion-Compensated Targeting
Solution Overview
Problem
Current catheter-based cardiac ablation methods for treating arrhythmias have limited success and pose significant risks due to cardiac motion and collateral damage, while external beam therapies lack targeted non-catheter ablation with high temporal and spatial resolution.
Innovation Solution
Particle or hadron therapy using accelerated atomic particles, such as carbon or helium atoms, is employed to penetrate cardiac tissue deeply and eliminate abnormal heart rhythms, with contouring techniques accounting for cardiac and respiratory motion to minimize collateral damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If catheter-based thermal ablation is used to treat arrhythmias, then local thermal damage can be achieved at the electrode-tissue interface, but the success rate is limited (70% at one year, below 50% at five years for atrial fibrillation; 20-70% for ventricular tachycardia) and requires repeated procedures
Solution Approach 1:
The patent replaces the mechanical catheter-based thermal ablation system with an external particle beam therapy system. Accelerated particles (protons, carbon ions) are directed through the body to deposit energy deep within cardiac tissue, eliminating the need for catheter insertion and thermal contact at the electrode-tissue interface. This substitution enables more reliable and durable arrhythmia treatment with higher success rates.
Solution Approach 2:
The patent changes the fundamental energy delivery parameter from thermal energy (heat) to kinetic energy of accelerated particles. Particle beams deliver energy directly to the target tissue through the Bragg peak effect, where particles deposit maximum energy at a specific depth, creating precise lesions without the need for thermal conduction through tissue. This parameter change enables deeper penetration and more effective ablation of arrhythmogenic substrates.
2Ease of operation
If external beam sources are used for noncatheter ablation, then targeted treatment without catheters is possible, but cardiac motion from contractility, respiration, and patient movement prevents high temporal and spatial resolution, leading to collateral damage to blood vessels, stroke, heart attacks, and damage to surrounding organs
Solution Approach 1:
The patent applies local quality by using particle beams with the Bragg peak effect, where energy deposition is concentrated at a specific depth within the tissue. This allows the external beam to deliver high energy precisely to the arrhythmogenic target while minimizing energy deposition in surrounding healthy tissues and organs. The localized energy deposition creates sharp dose gradients that protect critical structures from collateral damage.
Solution Approach 2:
The patent replaces the mechanical catheter system with an external particle beam delivery system that uses magnetic fields and precision positioning to guide the beam. This substitution eliminates the need for physical contact with the heart while achieving superior spatial resolution through magnetic steering and gating techniques that compensate for cardiac motion.
3Temperature
If catheter-based ablation is used, then contact with the internal or epicardial surface of the heart is required to achieve maximal thermal effects, but this contact requirement limits the ability to treat deep-seated arrhythmogenic substrates and increases procedural complexity
Solution Approach 1:
The patent replaces the mechanical catheter insertion and positioning system with an external particle beam delivery system. The beam is directed through the body using magnetic steering and precision positioning, eliminating the need for catheter navigation through blood vessels and heart chambers. This substitution simplifies the procedure while enabling treatment of deep-seated arrhythmogenic substrates that are inaccessible to catheters.
Solution Approach 2:
The patent transitions from a one-dimensional contact-based approach (catheter touching the heart surface) to a three-dimensional volumetric approach. Particle beams can deliver energy to any point within the cardiac volume by adjusting the beam angle, energy, and positioning, enabling treatment of deep-seated targets without physical contact with the heart surface.
4Reliability
If repeated ablations and implantable cardioverter defibrillator (ICD) pacemaker devices are required for ventricular tachycardia patients, then treatment coverage is expanded, but the cost increases significantly and up to 70% of patients with defibrillators still experience repeat episodes
Solution Approach 1:
The patent replaces the incremental approach of repeated catheter ablations and ICD implantation with a single, definitive particle beam therapy treatment. The high-energy particle beam creates extensive and durable lesions that completely eliminate the arrhythmogenic substrate, providing curative treatment rather than palliative management. This substitution reduces the total number of procedures and devices required while improving long-term outcomes.
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 achieves effective ablation of arrhythmias with reduced organ damage, offering higher success rates and safety compared to traditional methods, and is applicable to non-cardiac conditions like hypertension and seizures.
Implementation Method 1
Atomic particles, such as carbon atoms, protons, or helium atoms, for example, may be run through a linear accelerator to accelerate them towards the speed of light
Implementation Method 2
Delivery of accelerated atomic particles into the chest could more deeply penetrate tissue to deliver higher levels of energy
Implementation Method 3
This approach can be used to treat, for example, atrial fibrillation and ventricular tachycardia... The accelerated atomic particles can be highly effective in creating tissue lesions sufficient enough to eliminate abnormal heart rhythms
Data Source
Figure 1A~1C
Figure 2A~2I
Figure 3A~3B
AI summary
Particle or hadron therapy is used on abnormal tissue using carbon atoms, protons, or helium atoms run through a linear accelerator and then directed at the target in the body. This can be used to treat, for example, atrial fibrillation, ventricular tachycardia, hypertension, seizures, gastrointestinal maladies, etc. Contouring and gating may be used to account for cardiac and respiratory motion, helping reduce collateral damage.