Endometrial Ablation via Capacitive Plasma Coupling
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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
A system utilizing an expandable thin-wall dielectric member with a fluid-tight interior chamber, surrounded by a non-conductive gas, and polarity electrodes to capacitively couple radiofrequency current, creating a plasma for controlled and uniform ablation of endometrial tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional radiofrequency ablation devices are used, then endometrial ablation can be performed, but treatment time is prolonged and ablation depth is non-uniform
Solution Approach 1:
The patent employs a thin dielectric membrane (thickness 0.002" to 0.020") that conformally contacts the endometrial tissue surface. This thin film structure enables rapid energy transfer while maintaining uniform ablation depth through capacitive coupling, resolving the contradiction between fast treatment and uniform ablation.
Solution Approach 2:
The system controls ablation parameters by adjusting RF power (50-100W), frequency (450-550 kHz), and treatment duration (60-120 seconds). These parameter changes enable precise control over ablation depth (2-6mm) while maintaining rapid treatment speed, addressing both productivity and precision requirements.
2Productivity
If higher radiofrequency power is applied to speed up treatment, then treatment time decreases, but risk of injury to adjacent organs increases
Solution Approach 1:
The dielectric membrane acts as an intermediary between the RF energy source and the endometrial tissue. It enables capacitive coupling that delivers high power RF energy rapidly while confining the electric field to the tissue-contacting surface, preventing energy penetration into adjacent organs and resolving the safety-speed contradiction.
Solution Approach 2:
The system applies RF energy locally at the tissue-dielectric interface through capacitive coupling. The electric field is concentrated precisely where needed (at the endometrial surface) while remaining confined, enabling fast treatment without affecting deeper or adjacent structures, thus resolving the contradiction between treatment speed and safety.
3Reliability
If solid electrodes or balloon electrodes are used, then ablation can be performed, but treatment is incomplete or non-uniform
Solution Approach 1:
The thin dielectric membrane conformally adapts to the uterine cavity geometry and contacts the endometrial surface uniformly across the treatment area. This flexible thin film structure ensures complete and uniform ablation coverage, resolving the contradiction between ablation completeness and uniformity that plagues rigid electrode designs.
Solution Approach 2:
The dielectric membrane provides homogeneous electrical properties across the entire treatment surface, enabling uniform capacitive coupling and consistent ablation depth throughout the endometrial cavity. This homogeneity ensures both complete and uniform ablation, addressing the reliability-precision contradiction.
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 controlled ablation with uniform tissue effects, reducing the risk of injury to adjacent organs by precisely delivering radiofrequency energy to achieve desired ablation depths of 2 to 6 mm.
Implementation Method 1
The voltage is sufficient to initiate ionization of the neutral gas into a conductive plasma within the interior chamber
Implementation Method 2
The voltage further is sufficient to capacitively couple the current in the plasma across the thin dielectric wall and into endometrial tissue engaged by the external surface of the dielectric structure
Implementation Method 3
The treatment method generally comprises delivering a radiofrequency current to endometrial tissue in order to heat and usually ablate the tissue to a desired depth
Data Source
AI summary
Systems and methods for endometrial ablation. The systems include a handle and elongated introducer sleeve extending to an expandable working end having a fluid-tight interior chamber. A thin dielectric wall surrounds at least a portion of the interior chamber and has an external surface for contacting endometrial tissue. The thin dielectric wall surrounds a collapsible-expandable frame and receives an electrically non-conductive gas. First and second polarity electrodes are exposed to the interior and exterior of the chamber, respectively. A radiofrequency power source operatively connects to the electrode arrangement to apply a radiofrequency voltage across the first and second electrodes, wherein the voltage is sufficient to initiate ionization of the neutral gas into a conductive plasma within the interior chamber, and to capacitively couple the current in the plasma across the thin dielectric wall to ablate endometrial tissue engaged by the external surface of the dielectric structure.