Microwave Ablation Antenna Fluid Switching for Zone Temperature Control
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Solution Overview
Problem
Existing microwave ablation systems lack precise control over the size and temperature of the ablation zone, which can lead to inefficiencies and potential damage to healthy tissue.
Innovation Solution
A microwave ablation system with dual fluid supply sources, allowing selection between sterile water and saline to control ablation zone size and maximum temperature by harmonizing tissue impedance and providing coolant functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If microwave energy is applied to tissue to create an ablation zone, then malignant tissue is destroyed, but control over the size and temperature of the ablation zone is insufficient
Solution Approach 1:
The system divides the fluid supply into multiple independent sources (sterile water source and saline source), each capable of being selectively connected to the antenna assembly. This segmentation allows independent control of fluid types to precisely manage ablation zone characteristics while maintaining operational simplicity through automated switching.
Solution Approach 2:
The system dynamically switches between different fluid types (sterile water and saline) based on real-time treatment requirements. The selective fluid connection mechanism enables the operator to adapt the ablation zone size and temperature profile during the procedure by choosing which fluid source to activate, providing dynamic control over treatment parameters.
2Temperature
If different fluid types are used to control ablation zone size, then temperature control is improved, but system complexity increases
Solution Approach 1:
The antenna assembly is designed with universal compatibility for both sterile water and saline fluid sources. The same antenna structure and delivery mechanism handle both fluid types, requiring no additional specialized components. This multi-functionality approach allows temperature control through fluid selection while avoiding the complexity of separate delivery systems for each fluid type.
Solution Approach 2:
The system introduces a selective connection mechanism (valve or connector) as an intermediary between the fluid sources and the antenna assembly. This intermediary component manages the complexity of dual fluid supply by providing a centralized control point, allowing the operator to switch between sterile water and saline without modifying the antenna assembly or other core components.
3Volume of stationary object
If sterile water is used as coolant, then ablation zone size is increased, but temperature control precision may be reduced
Solution Approach 1:
The system changes the physical-chemical parameters of the coolant by selecting between sterile water and saline. Sterile water, having different thermal properties than saline, allows for larger ablation zones when selected. The ability to switch between these parameter sets enables optimization of both ablation zone size and temperature control precision depending on the specific treatment requirements.
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 control over ablation zone size and temperature, minimizing energy loss and ensuring a well-defined treatment outcome with improved safety and efficacy.
Implementation Method 1
by harmonizing tissue impedance
Implementation Method 2
providing coolant functionality
Implementation Method 3
electrosurgical energy is passed through the probe and into surrounding tissue to form an ablation zone
Implementation Method 4
The energy applied to the tissue denatures the cancerous cells at elevated temperatures
Data Source
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AI summary
A microwave ablation system includes a microwave ablation antenna assembly, a generator, a first fluid supply source, and a second fluid supply source. The microwave ablation antenna assembly includes a fluid port for receiving fluid. The generator is coupled to the microwave ablation antenna assembly. The first fluid supply source is configured to be selectively in fluid communication with the fluid port to supply a first fluid to the microwave ablation antenna assembly. The second fluid supply source is configured to be selectively in fluid communication with the fluid port to supply a second fluid to the microwave ablation antenna assembly.