Microwave Ablation Probe Axial Spacing Control
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Solution Overview
Problem
Variation in axial distance between the distal radiating portion and the trocar in microwave ablation probes can result in sub-optimal ablation shape and degraded performance, as it may be too large or too small, leading to irregular ablation zones and incomplete ablation.
Innovation Solution
A method of manufacturing microwave antenna probes that involves establishing a pre-determined voltage differential between components, monitoring electrical characteristics, and using sensors to determine the target axial distance, ensuring precise spacing through automated feedback systems, and utilizing sensors like capacitance, inductance, magnetic fields, or acoustic responses to achieve optimal positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual assembly methods are used to position components, then manufacturing simplicity is maintained, but manufacturing precision deteriorates due to variation in axial distance
Solution Approach 1:
The patent replaces manual mechanical positioning with an automated system that uses electrical discharge detection to determine axial distance. The system automatically positions the trocar relative to the radiating portion by monitoring electrical characteristics, eliminating manual measurement and positioning errors while maintaining manufacturing simplicity through automated control.
Solution Approach 2:
The patent implements a feedback mechanism where the electrical characteristic (such as capacitance or resistance) is continuously monitored during assembly. When the axial distance reaches the target value, the electrical discharge or characteristic change provides immediate feedback to stop the positioning process, ensuring precise axial distance control without complex mechanical measurement systems.
2Manufacturing precision
If automated feedback systems are implemented, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical measurement and positioning systems with an electrical-based automated system. By using electrical discharge or capacitance sensing to detect axial distance, the system achieves high manufacturing precision while avoiding the complexity of mechanical gauges, scales, and manual measurement procedures.
Solution Approach 2:
The automated feedback system uses the components themselves (trocar and radiating portion) as part of the sensing mechanism. The electrical characteristic is measured between the components being assembled, allowing the assembly process to self-regulate and self-verify the axial distance without requiring separate measurement instruments or complex external monitoring equipment.
3Manufacturing precision
If voltage differential method is used, then manufacturing precision is improved, but use of energy increases
Solution Approach 1:
The patent applies voltage during the brief positioning phase only, not throughout the entire assembly process. The voltage differential is established temporarily to detect the target axial distance through electrical discharge or capacitance change, then removed once positioning is complete. This minimizes energy consumption while achieving precise positioning.
Solution Approach 2:
The system uses changes in electrical parameters (capacitance, resistance, or discharge voltage) as the axial distance changes during positioning. By monitoring these parameter changes rather than applying continuous high energy, the system achieves precise axial distance control with minimal energy consumption. The voltage differential is adjusted dynamically based on the positioning stage.
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
Ensures optimal performance of microwave ablation probes by maintaining consistent axial spacing, preventing sub-optimal ablation shapes and enhancing ablation efficiency by accurately positioning the trocar relative to the radiating portion.
Implementation Method 1
the voltage differential between the first and second components is monitored to determine whether electrical discharge has occurred. When electrical discharge occurs, the axial distance between the first and second components is equal to the target axial distance
Implementation Method 2
a decrease in the voltage differential between the first and second components is monitored. A decrease in voltage differential indicates the occurrence of electrical discharge between the first and second components
Implementation Method 3
the capacitance and/or the inductance between the first and second components is sensed to determine the axial distance between the first and second components
Implementation Method 4
the capacitance and/or the inductance between the first and second components is sensed to determine the axial distance between the first and second components
Implementation Method 5
one or more magnetic fields are applied to the surgical instrument. In such an aspect, characteristics of the magnetic field are sensed to determine the axial distance between the first and second components
Implementation Method 6
an acoustic response is sensed to determine whether the axial distance between the first and second components is equal to the target axial distance
Data Source
AI summary
A method of manufacturing a surgical instrument includes charging a first component to a first voltage, charging a second component to a second voltage such that a pre-determined voltage differential is established between the first and second components, axially moving at least one of the first and second components relative to the other, monitoring an electrical characteristic to determine whether an axial distance between the first and second components is equal to a target axial distance, and retaining the first and second components in fixed position relative to one another once the axial distance between the first and second components is equal to the target axial distance.