Capacitive RF Endometrial Ablation via Plasma Dielectric
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Solution Overview
Problem
Existing endometrial ablation technologies face challenges such as slow treatment times, incomplete ablation, non-uniform ablation depths, and risk of injury to adjacent organs during radiofrequency current application for menorrhagia treatment.
Innovation Solution
An electrosurgical system utilizing an expandable thin-wall dielectric structure with an ionized gas to capacitively couple radiofrequency current to endometrial tissue, allowing for controlled ablation depth and reduced risk of organ injury through capacitive coupling and plasma formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional solid electrodes or balloon electrodes are used for radiofrequency ablation, then ablation can be achieved, but treatment time is prolonged and ablation depth is non-uniform
Solution Approach 1:
The patent introduces an ionized gas (plasma) as an intermediary medium between the electrode and the endometrial tissue. The plasma is contained within a dielectric barrier (such as a balloon or sheath) that is positioned against the tissue. Radiofrequency energy is applied to the plasma, which then transfers energy uniformly to the tissue through the dielectric barrier, achieving both rapid heating and uniform ablation depth without direct electrode-tissue contact.
Solution Approach 2:
The patent changes the physical state of the working medium from solid (traditional electrodes) to ionized gas (plasma). This parameter change allows for more uniform energy distribution and faster heating rates. The plasma state enables broader surface contact and more consistent thermal transfer to the tissue, resolving the contradiction between treatment speed and ablation uniformity.
2Productivity
If high power radiofrequency energy is applied to achieve rapid ablation, then treatment time is reduced, but risk of injury to adjacent organs increases
Solution Approach 1:
The dielectric barrier (balloon or sheath) serves as a protective intermediary between the high-power radiofrequency source and the surrounding tissues. This barrier confines the plasma and directs energy transmission primarily to the target endometrial tissue, reducing stray energy that could damage adjacent organs. The dielectric material itself limits the penetration depth of the radiofrequency energy, providing an inherent safety mechanism.
Solution Approach 2:
The patent applies energy locally through the dielectric barrier that is positioned only at the target site. The plasma is generated and contained within the dielectric structure, concentrating the high-power radiofrequency energy precisely where needed (the endometrial tissue in contact with the dielectric) while minimizing exposure to surrounding healthy tissues and organs.
3Reliability
If incomplete ablation is avoided by increasing energy delivery, then ablation completeness improves, but treatment complexity and risk increase
Solution Approach 1:
The dielectric barrier with plasma provides a controlled interface that ensures complete energy transfer to the tissue. The plasma, being an ionized gas, has high electrical conductivity and can efficiently couple radiofrequency energy to the tissue through the dielectric barrier. This intermediary system allows for predictable and complete ablation without requiring overly complex control mechanisms or multiple treatment passes.
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 system enables rapid and uniform endometrial ablation with controlled depth, minimizing the risk of injury to adjacent organs and improving treatment efficiency.
Implementation Method 1
capacitively coupling the current through an expandable, thin-wall dielectric member enclosing an ionized gas
Implementation Method 2
enclosing an ionized gas
Implementation Method 3
applying radiofrequency current to endometrial tissue by means of capacitively coupling the current through an expandable, thin-wall dielectric member
Data Source
AI summary
Methods, systems and devices for endometrial ablation. In accordance with a method, a working end of an RF ablation device is positioned in a patient uterus to contact endometrial tissue, the working end comprising a dielectric. Radiofrequency energy is applied for a first interval of time at constant power, the power being sufficient to capacitively couple current across the dielectric to the contacted endometrial tissue. A voltage parameter measured within the first interval, and radiofrequency energy is applied at a constant voltage over a second, treatment interval to ablate endometrial tissue, the constant voltage being related to the recorded voltage.