RF Tissue Ablation with Real-Time Impedance Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing endometrial lining ablation procedures face challenges in achieving uniform and complete ablation regardless of uterine cavity size or tissue moisture, requiring pre-procedure measurements and varying procedure times.
Innovation Solution
A system and method for modulating radiofrequency (RF) power delivery using an RF applicator and controller to track a target tissue impedance based on a predetermined ablation curve, adjusting power at regular intervals to achieve a uniform impedance of approximately 50 ohms in two minutes, independent of uterine cavity size or other factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-procedure uterine cavity measurements are taken and power levels are adjusted accordingly, then ablation completeness is improved, but procedure complexity and time are increased
Solution Approach 1:
The system automatically measures tissue impedance and modulates RF power delivery without requiring operator input for uterine cavity measurements. The controller autonomously adjusts power levels based on real-time impedance feedback, eliminating the need for manual pre-procedure measurements and calculations.
Solution Approach 2:
The system continuously monitors tissue impedance during RF power delivery and uses this feedback to dynamically modulate the power output. The controller compares measured impedance against target values and adjusts power in real-time to maintain optimal ablation conditions, ensuring complete tissue destruction regardless of uterine size variations.
2Reliability
If RF power is delivered continuously to achieve complete ablation, then treatment effectiveness is improved, but risk of overheating and tissue damage increases
Solution Approach 1:
The system delivers RF power in a modulated manner rather than continuous delivery. The controller periodically adjusts power levels based on real-time impedance measurements, creating cycles of power delivery and reduction that prevent thermal accumulation while maintaining effective ablation over the fixed procedure time.
Solution Approach 2:
Real-time impedance monitoring provides continuous feedback on tissue thermal state. When impedance indicates approaching target conditions or potential overheating, the controller automatically reduces power delivery, preventing tissue damage while ensuring complete ablation is achieved within the two-minute procedure window.
3Manufacturing precision
If procedure time is extended to accommodate varying uterine sizes, then ablation uniformity is improved, but productivity and efficiency are reduced
Solution Approach 1:
The system dynamically adapts power delivery to match the specific characteristics of each patient's tissue. Rather than using fixed power levels or extended procedures, the controller continuously adjusts power modulation parameters based on real-time impedance feedback, achieving uniform ablation across different uterine sizes within a consistent two-minute timeframe.
Solution Approach 2:
The system changes the parameter of power delivery modulation based on measured tissue impedance. By dynamically altering power levels rather than extending procedure time, the system achieves uniform ablation depth and completeness across varying tissue volumes while maintaining efficient, time-limited procedures.
4Manufacturing precision
If power modulation is implemented to track target impedance, then ablation precision is improved, but control system complexity is increased
Solution Approach 1:
The control system uses simple impedance feedback from tissue measurements to drive power modulation. The controller compares measured impedance against predetermined target values and automatically adjusts power delivery accordingly, achieving precise ablation depth control through a relatively straightforward feedback loop that requires minimal additional hardware complexity.
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
Ensures predictable and repeatable ablation procedure times with uniform tissue ablation depths without requiring pre-procedure uterine cavity measurements, maintaining clinical success by reaching a target impedance within a fixed duration.
Implementation Method 1
Techniques using RF energy provide an RF electrical signal to one or more electrodes in contact with the subject organ tissue. Electrical current flows from the electrodes and into the organ tissue. The current flow resistively heats the surrounding tissue.
Implementation Method 2
The controller includes a tissue impedance measurement circuit operatively coupled with the RF applicator and configured for measuring an impedance of tissue disposed adjacent to the RF applicator
Data Source
AI summary
A system for modulating delivery of radiofrequency (RF) power to tissue, the system including an RF applicator configured for being positioned adjacent to tissue, an RF generator electrically coupled to the RF applicator, and a controller operatively coupled to the RF generator. The controller includes a tissue impedance measurement circuit operatively coupled with the RF applicator and configured for measuring an impedance of tissue disposed adjacent to the RF applicator, and a power modulation module configured to cause RF power to be delivered from the RF generator to the tissue disposed adjacent to the RF applicator so that an impedance of the tissue tracks a target tissue impedance as a function of time.