Endometrial Ablation via Plasma Capacitive 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 using an expandable thin-wall dielectric member with a fluid-tight interior chamber, surrounded by a collapsible-expandable frame, delivers radiofrequency current through a conductive plasma created by ionizing a neutral gas, allowing for controlled and uniform ablation of endometrial tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional radiofrequency ablation devices are used, then ablation can be achieved, but treatment time is slow and ablation depth is non-uniform
Solution Approach 1:
The ablation device divides the treatment area into multiple zones with different electrode configurations. The device includes a first electrode array for initial ablation and a second electrode array for subsequent ablation, allowing different regions to be treated simultaneously with optimized parameters, thereby reducing overall treatment time while maintaining uniform ablation depth across the entire endometrial surface.
Solution Approach 2:
The device employs adjustable electrode configurations and controllable RF energy delivery parameters. The system can dynamically adjust power levels, electrode activation sequences, and treatment zones based on real-time tissue response, enabling both rapid treatment and precise control over ablation depth uniformity across different anatomical regions.
2Productivity
If higher RF power is applied to speed up treatment, then treatment time decreases, but risk of injury to adjacent organs increases
Solution Approach 1:
The device applies RF energy with spatially varying characteristics through different electrode arrays. Each electrode or electrode group can deliver customized power levels and treatment durations tailored to local tissue conditions and anatomical variations, enabling rapid treatment of thickened areas while using lower power in regions near sensitive structures, thus reducing overall treatment time without increasing risk to adjacent organs.
Solution Approach 2:
The system incorporates real-time monitoring of tissue impedance, temperature, and ablation depth. This feedback allows the control system to dynamically adjust RF power delivery, automatically reducing power when approaching safe depth limits or detecting proximity to critical structures, thereby maintaining high treatment efficiency while preventing injury to adjacent organs.
3Reliability
If traditional ablation methods are used, then treatment can be performed, but ablation coverage is incomplete
Solution Approach 1:
The device divides the endometrial ablation into multiple sequential phases using different electrode arrays. The first electrode array performs initial ablation of accessible areas, while the second electrode array treats previously inaccessible or residual tissue. This segmented approach ensures complete ablation coverage without requiring prolonged continuous treatment, thereby improving both completeness and efficiency.
Solution Approach 2:
The system employs periodic or pulsed RF energy delivery with alternating activation of different electrode arrays. This periodic action allows tissue to respond and cool between pulses, enabling more complete ablation through multiple treatment cycles while maintaining reasonable overall treatment time through efficient alternation between treatment zones.
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 of endometrial tissue to a desired depth, reducing the risk of injury to adjacent organs and achieving uniform tissue effects.
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
delivering a radiofrequency current to endometrial tissue in order to heat and usually ablate the tissue to a desired depth
Implementation Method 4
A thin dielectric wall surrounds at least a portion of the interior chamber and has an external surface for contacting endometrial tissue
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.