Directive Ablation Antenna with Dielectric Loading
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Solution Overview
Problem
Current electrosurgical devices with non-directional radiation patterns often damage healthy tissue during tumor ablation procedures due to the inability to precisely control the radiation of microwave energy, making it difficult to target small or hard-to-reach lesions without affecting surrounding healthy tissue.
Innovation Solution
The development of electrosurgical devices with directional radiation patterns, utilizing a dipole microwave antenna assembly and a dielectrically loaded coaxial feedline with a coolant system, allows for focused microwave energy delivery, enabling precise targeting of tumors while minimizing damage to adjacent healthy tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If non-directional ablation probes are used to treat tumors, then the ablation energy can reach the target tissue, but healthy tissue on the non-tumor side of the radiating section is damaged
Solution Approach 1:
The antenna assembly is designed with non-uniform dielectric loading along its length, creating different radiation characteristics at different locations. The dielectric material is concentrated at specific positions to shape the radiation pattern, ensuring energy is directed toward the tumor while minimizing exposure to healthy tissue on the opposite side.
Solution Approach 2:
The antenna assembly employs an asymmetric structure with dielectric material positioned preferentially on one side of the radiating section. This asymmetry creates a directional radiation pattern that concentrates electromagnetic energy toward the tumor side while reducing radiation intensity toward healthy tissue, thereby resolving the contradiction between effective targeting and healthy tissue protection.
2Reliability
If microwave energy is radiated to heat and destroy tumor cells, then malignant tissue can be ablated, but it is difficult to assess the extent of radiation into surrounding tissue
Solution Approach 1:
Temperature sensors are integrated into the antenna assembly to provide real-time feedback on tissue temperature during ablation. This feedback mechanism allows the system to monitor the extent of energy deposition and adjust power delivery accordingly, enabling precise control over the ablation zone boundaries and improving reliability of treatment outcomes.
3Manufacturing precision
If ablation probes are inserted into tissues to treat tumors, then electromagnetic energy can be delivered to target tissue, but small or hard-to-reach lesions cannot be precisely targeted
Solution Approach 1:
The antenna assembly incorporates adjustable elements that allow dynamic modification of the radiation pattern during the procedure. This dynamic capability enables the system to adapt to different lesion sizes, shapes, and locations, providing precise targeting for small or hard-to-reach tumors while maintaining versatility for treating various types of lesions through reconfiguration of the dielectric loading or antenna orientation.
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 enables more precise and controlled tissue ablation, reducing the risk of damaging healthy tissue and allowing for effective treatment of small or hard-to-reach tumors by focusing the heating zone, thus improving the accuracy and safety of the ablation process.
Implementation Method 1
A dielectric material is positioned within the radiating section of the antenna assembly to concentrate the electromagnetic energy and create a focused heating zone in the tissue.
Implementation Method 2
electromagnetic energy is passed through the probes into surrounding tissue... Microwave energy is sometimes utilized to perform these methods
Implementation Method 3
A coolant may be provided through a catheter that flows over an outer surface of the antenna assembly
Data Source
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AI summary
An electrosurgical device for directing energy to a target volume of tissue, comprising: a coaxial feedline having an inner conductor, an outer conductor coaxially disposed around the inner conductor, and a dielectric material disposed therebetween; an elongated electrically-conductive member longitudinally disposed at a distal end of the inner conductor; a balun disposed in association with the outer conductor; an electrically-conductive cylinder coaxially disposed around a distal portion of the balun; and a dielectric structure disposed substantially adjacent to a distal end of the electrically-conductive cylinder, wherein the dielectric structure longitudinally extends from the distal end of the electrically-conductive cylinder to a distal end of the electrically-conductive member.