Microwave Ablation Step-Up Power Control
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Solution Overview
Problem
Microwave tissue ablation devices face challenges in creating predictably sized and shaped ablation volumes due to the risk of steam pocket formation and subsequent 'steam pops,' which can cause discomfort and medical complications.
Innovation Solution
The system includes an ablation device configured to provide energy to a target area, an ablation generator to provide power, and a controller that adjusts the power from a first level to a second, higher level by incrementing through a series of intermediate power levels, using a step-up function to minimize steam pocket formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high power level is applied immediately to achieve effective ablation, then ablation efficiency is improved, but steam pocket formation increases causing steam pops and patient discomfort
Solution Approach 1:
The patent applies a preliminary low power level phase before the main ablation phase. The controller initially delivers power at a first level lower than the target ablation power, allowing tissue heating to begin gradually and steam pockets to dissipate before the higher power is applied. This preliminary action prevents steam pop complications while maintaining overall ablation efficiency.
Solution Approach 2:
The patent dynamically adjusts power levels during the ablation process. The controller transitions from a first power level to a second, higher power level based on real-time conditions, including detection of steam pockets or other tissue states. This dynamic power adjustment optimizes both ablation efficiency and patient comfort by adapting to changing tissue conditions.
2Productivity
If power is increased rapidly to reduce procedure time, then productivity is improved, but ablation volume predictability decreases due to steam pops
Solution Approach 1:
By implementing a preliminary low-power phase before full-power ablation, the system prepares the tissue to accept controlled heating. This preliminary action ensures that when the higher power is applied, the ablation volume forms predictably without disruption from steam pops, maintaining both time efficiency and volume consistency.
Solution Approach 2:
The controller monitors ablation conditions in real-time and uses this feedback to determine when to transition between power levels. This feedback mechanism ensures that power increases are timed appropriately to maintain predictable ablation volume formation while minimizing procedure time, preventing steam pocket formation that would disrupt volume consistency.
3Duration of action of moving object
If continuous high power is applied to maximize ablation speed, then treatment time is reduced, but steam pockets burst causing patient discomfort and complications
Solution Approach 1:
The patent employs periodic power level changes rather than continuous high power. The controller alternates between lower power phases and higher power phases, allowing steam pockets to dissipate during lower power intervals while maintaining overall treatment efficiency. This periodic action reduces treatment time compared to traditional low-power continuous methods while preventing steam pop complications.
Solution Approach 2:
The system performs preliminary low-power heating to prepare tissue and allow steam dissipation before applying full power. This preliminary action prevents steam pocket formation during the main treatment phase, eliminating patient discomfort from steam pops while maintaining acceptable treatment times through efficient power management.
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 enables the creation of more predictable and spherical ablation volumes, simplifying surgical procedures and reducing undesirable medical complications by minimizing steam pocket formation and 'steam pops'.
Implementation Method 1
Microwave ablation is one of such treatments utilizing electromagnetic radiation to heat tissue
Implementation Method 2
a coolant system for the ablation device, the coolant system includes a coolant chamber, the coolant chamber surrounding a distal portion of the ablation device
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
Various aspects of the present invention are directed to apparatuses, systems, and methods that may include a tissue ablation system. The tissue ablation system may include an ablation device; an ablation generator; and a controller configured to cause the ablation generator to apply a first power level to the ablation device and cause the ablation generator to apply a second power level to the ablation device, the second power level being higher than the first power level; the power provided by the ablation generator to the ablation device is adjusted from the first power level to the second power level, adjusting the power from the first power level to the second power level includes causing the ablation generator to provide a plurality of distinct intermediate power levels corresponding to delivering a plurality of intermediate energy levels from the ablation device, and each of the intermediate power levels is between the first power level and the second power level.