Multi-Sensor Irrigated Ablation Electrode for Temperature Control
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Solution Overview
Problem
Current cardiac ablation technologies face challenges in accurately monitoring and controlling temperature during radiofrequency (RF) ablation due to orientation issues with thermal sensors, leading to inaccurate temperature readings and potential tissue damage from excessive heat, as well as the formation of coagulum and soft thrombus, which hinder effective energy delivery and lesion formation.
Innovation Solution
The implementation of an irrigated ablation electrode system with multiple thermal sensors and a control system that adjusts irrigation fluid flow rates and energy delivery based on real-time temperature feedback, using pulsatile flow to improve temperature correlation between the electrode and tissue, and segmenting the electrode for more precise thermal monitoring, while also using irrigation fluids to prevent coagulum and thrombus formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single thermal sensor is used to monitor temperature during RF ablation, then the device complexity is reduced, but the measurement precision of temperature at the electrode/tissue interface deteriorates due to orientation issues and cooling effects
Solution Approach 1:
The patent divides the single thermal sensor into multiple thermal sensors positioned at different locations on the electrode assembly. This segmentation allows each sensor to monitor temperature at its specific location, and the system can then determine the maximum temperature to accurately represent the electrode/tissue interface temperature, resolving the orientation and cooling issues that plague single-sensor systems
Solution Approach 2:
The patent implements a feedback mechanism where temperature readings from multiple thermal sensors are continuously monitored, and the maximum reading is used to control the RF energy delivery. This feedback loop ensures that temperature control is based on the most critical measurement, improving measurement precision while maintaining a manageable device complexity through automated processing
2Productivity
If RF ablation energy is increased to create larger lesions, then the productivity of the ablation procedure is improved, but the temperature of the electrode and tissue rises excessively causing tissue damage such as charring and steam pop
Solution Approach 1:
The patent implements continuous temperature monitoring during RF ablation using multiple thermal sensors. This continuous feedback allows the system to maintain optimal energy delivery levels throughout the procedure, ensuring that productivity is maximized while preventing temperature excursions that would cause tissue damage. The continuous action ensures that lesions can be created efficiently without interruption for safety concerns
Solution Approach 2:
The patent employs dynamic adjustment of RF energy delivery based on real-time temperature feedback from multiple sensors. The system can modulate power levels during the ablation process, increasing energy when safe and reducing it when temperature thresholds are approached. This dynamic control enables larger lesions to be created productively while preventing harmful overheating and tissue damage
3Reliability
If irrigation fluid flow rate is increased to prevent coagulum formation and improve cooling, then the reliability of energy delivery is improved, but the energy efficiency deteriorates due to increased energy required to drive higher flow rates
Solution Approach 1:
The patent applies partial irrigation by delivering cooling fluid at controlled rates that are sufficient to prevent coagulum formation and maintain reliable energy delivery, but not excessively high to waste energy. The system adjusts irrigation flow to the minimum necessary level to achieve the cooling and anti-coagulum effects, optimizing the balance between reliability and energy efficiency
Solution Approach 2:
The patent dynamically adjusts irrigation flow rate parameters based on temperature feedback from multiple thermal sensors. When temperatures indicate a need for enhanced cooling or when coagulum risk is detected, the system increases flow rate; when temperatures are stable and safe, it reduces flow rate. This parameter modulation maintains reliable energy delivery while minimizing energy loss to irrigation pumping
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 approach enhances the accuracy of temperature monitoring and control, increases energy delivery during RF ablation, reduces tissue damage, and allows for the creation of larger lesions by maintaining effective irrigation and energy distribution, thereby improving the precision and safety of cardiac ablation procedures.
Implementation Method 1
radio frequency (RF) ablation
Implementation Method 2
temperature elevation can result in coagulum formation
Implementation Method 3
use ablation electrode assemblies to provide irrigation fluid during RF ablation
Implementation Method 4
via a thermal sensor such as a thermocouple or thermistor
Implementation Method 5
via a thermal sensor such as a thermocouple or thermistor
Data Source
AI summary
Cardiac ablation devices and systems are disclosed. A system in accordance with the present disclosure comprises an ablation generator, an electronic control unit (ECU), a control system, and a catheter. The catheter comprises at least one ablation electrode, a catheter shaft including a fluid lumen, and a plurality of thermal sensors. The ECU is configured to receive temperature measurement data from the plurality of thermal sensors, determine a power rate delivery value based on the temperature measurement data, and output the power rate delivery value. The control system is configured to receive the power rate delivery value and control energy delivery of the ablation generator based at least in part on the power rate delivery value.