Radiometric Tissue Contact Detection for Ablation Energy Delivery
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Solution Overview
Problem
Existing tissue ablation techniques lack effective methods for determining the quality of contact between energy delivery members and tissue prior to and during energy delivery, leading to inefficiencies and potential damage to unintended tissues.
Innovation Solution
A system utilizing a radiometer to assess tissue contact quality by analyzing the variability of output signals, with a processor determining contact levels based on moving averages and variability indices, and providing visual or auditory feedback to ensure accurate and efficient energy delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional tactile feedback and visual inspection methods are used to assess tissue contact, then the device complexity remains low, but the measurement precision of contact quality is insufficient
Solution Approach 1:
The radiometer is integrated into the energy delivery member to perform dual functions: delivering therapeutic energy and simultaneously monitoring tissue contact quality through radiometric measurements. This eliminates the need for separate contact assessment devices while improving measurement precision.
Solution Approach 2:
The patent replaces traditional mechanical tactile feedback methods with radiometric sensing. The radiometer detects changes in radiometric signals caused by tissue contact, providing objective quantitative measurement instead of subjective tactile assessment, thereby improving contact quality assessment accuracy.
2Measurement precision
If radiometric monitoring is implemented to improve contact detection accuracy, then measurement precision improves, but the device complexity increases due to additional sensors and processing requirements
Solution Approach 1:
The radiometer and energy delivery components are merged into a single integrated device. The radiometric monitoring function is combined with the energy delivery function, allowing contact quality assessment without requiring separate standalone sensors or monitoring systems.
Solution Approach 2:
The energy delivery member performs self-monitoring of its own contact quality through the integrated radiometer. The system uses its own operational state (energy delivery) to generate the radiometric signals needed for contact assessment, eliminating the need for external monitoring equipment.
3Reliability
If real-time radiometric feedback is provided during energy delivery, then the reliability of treatment increases, but the loss of time for signal processing and analysis increases
Solution Approach 1:
The system implements real-time feedback by continuously monitoring radiometric signals during energy delivery and immediately using this information to assess contact quality. The feedback loop operates continuously without interruption to treatment, ensuring reliable contact assessment while minimizing processing delays.
Solution Approach 2:
The radiometric monitoring operates continuously throughout the energy delivery process without interruption. The signal processing occurs in real-time alongside energy delivery, maintaining continuous useful action rather than introducing pauses for separate measurement and analysis phases.
4Measurement precision
If multiple sensors are added to improve contact and tissue type detection, then measurement precision improves, but the device complexity and cost increase
Solution Approach 1:
The radiometer is designed to perform multiple functions: detecting tissue contact quality, characterizing tissue type, and monitoring treatment progress. This single multi-functional sensor replaces what would otherwise require multiple separate sensors, maintaining measurement precision while reducing device 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
Enhances contact detection accuracy, reduces procedure time, minimizes unintended tissue damage, and optimizes energy delivery by providing user-friendly visual feedback without the need for additional sensors, thus improving treatment efficacy.
Implementation Method 1
Medical microwave radiometry utilizes temperature dependent microwave radiation from tissue to non-invasively monitor thermal ablation procedures
Data Source
AI summary
Radiometric systems may comprise a radiometer, an antenna and a processor communicatively coupled together. The processor may provide a contact-focused output based on filtering or other processing of a raw radiometric output signal. The contact-focused output may facilitate determination of whether contact has been achieved and/or assessment of contact. A miniaturized reflectometer may be configured to determine an amount of reflected power from the antenna. The processor may be configured to determine a reflection coefficient of the reflected power determined by the reflectometer and to identify tissue type based on the reflection coefficient. Systems and methods for facilitating deeper temperature measurements of a radiometer are described.