Microwave Ablation Control via Reflected Power Monitoring
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Solution Overview
Problem
Current microwave ablation systems lack real-time monitoring capabilities for ablation zone size, leading to potential overheating of healthy tissues during procedures.
Innovation Solution
A system comprising a power source with a microprocessor executing control algorithms, a microwave antenna, and an ablation zone control module that uses data look-up tables to monitor reflected power and adjust microwave energy delivery based on predetermined threshold values, enabling real-time monitoring and control of the ablation zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-invasive microwave energy is used to treat underlying tissue, then the ability to non-invasively penetrate skin is improved, but unwanted heating of healthy tissue occurs
Solution Approach 1:
The system continuously monitors the impedance of the tissue during microwave delivery and compares it to expected values. When the measured impedance deviates from the expected range, indicating potential overheating of healthy tissue, the system automatically adjusts or terminates microwave energy delivery to prevent harm.
Solution Approach 2:
The patent introduces an intermediary control system that acts between the microwave energy source and the tissue. This control system uses impedance measurements as an intermediary parameter to infer tissue temperature and control microwave delivery, preventing direct thermal damage to healthy tissues.
2Measurement precision
If sensors are used to monitor ablation zone, then temperature feedback capability is improved, but the power source must be powered off during sensing
Solution Approach 1:
The system uses the microwave antenna itself to perform dual functions: delivering microwave energy for ablation and measuring tissue impedance for temperature monitoring. This eliminates the need for separate sensors that would require power shutdown, as the antenna continuously performs both therapeutic and monitoring functions simultaneously.
Solution Approach 2:
The microwave antenna serves itself by using its own electrical characteristics (impedance) to monitor the ablation process. The system extracts temperature information from changes in the antenna's impedance during continuous operation, eliminating the need for external sensing devices and allowing uninterrupted ablation therapy.
3Productivity
If microwave energy is delivered continuously for effective treatment, then treatment efficacy is improved, but real-time monitoring of ablation zone size becomes difficult
Solution Approach 1:
The system continuously measures the impedance of the microwave antenna during energy delivery and feeds this information back to a control system. The impedance changes provide real-time information about ablation zone size and tissue temperature, allowing monitoring without interrupting the continuous microwave energy delivery needed for effective treatment.
Solution Approach 2:
The patent replaces mechanical or separate electronic sensing systems with an electrical impedance-based monitoring method. By measuring changes in the antenna's electrical impedance during continuous operation, the system obtains real-time ablation zone information without requiring physical sensors or interrupting the microwave energy delivery.
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
This solution allows for precise control of the ablation zone size and temperature, minimizing damage to healthy tissues and ensuring effective treatment by correlating reflected power with ablation zone size, thereby enhancing the safety and efficacy of microwave ablation procedures.
Implementation Method 1
A microwave antenna is configured to deliver microwave energy from the power source to tissue to form an ablation zone
Implementation Method 2
The ablation zone control module triggers a signal when a predetermined threshold value of the electrical parameter(s) is measured corresponding to the radius of the ablation zone
Data Source
AI summary
A system for monitoring ablation size is provided and includes a power source including a microprocessor for executing at least one control algorithm. A microwave antenna is configured to deliver microwave energy from the power source to tissue to form an ablation zone. An ablation zone control module is in operative communication with a memory associated with the power source. The memory includes one or more data look-up tables including data pertaining to a control curve varying over time and being representative of one or more electrical parameters associated with the microwave antenna. Points along the control curve correspond to a value of the electrical parameters and the ablation zone control module triggers a signal when a predetermined threshold value of the electrical parameter(s) is measured corresponding to the radius of the ablation zone.