Microwave Ablation Antenna Hub Sealing via Segmented Flow Channels
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Solution Overview
Problem
Existing microwave ablation antenna assemblies face challenges in effectively sealing the inflow and outflow of a cooling medium in the hub portion, which can lead to fluid leakage and inefficiencies in cooling.
Innovation Solution
The microwave ablation antenna assembly incorporates a hub with integrated fluid inflow and outflow chambers, separated by a hub divider and hub cap that form seals to prevent fluid flow between the chambers except through specific fluid channels, ensuring efficient cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a circulating fluid is pumped through the microwave ablation antenna assembly with separate inflow and outflow chambers, then cooling efficiency is improved, but sealing reliability deteriorates due to potential fluid leakage between chambers
Solution Approach 1:
The hub is divided into separate inflow and outflow chambers by a hub divider, with each chamber having dedicated fluid channels. This segmentation prevents fluid mixing and leakage between chambers while maintaining efficient cooling flow paths. The hub divider creates distinct compartments that isolate inflow from outflow, eliminating cross-contamination of cooling fluid.
Solution Approach 2:
O-rings are introduced as intermediary sealing elements at critical interfaces within the hub structure. These sealing rings prevent fluid leakage between the inflow and outflow chambers by creating impermeable barriers at the interfaces between hub components, ensuring reliable sealing while allowing the chambers to remain separate for efficient cooling operation.
2Reliability
If O-rings are used to form seals in the hub assembly, then sealing effectiveness is improved, but device complexity increases due to additional sealing components
Solution Approach 1:
O-rings, which are flexible sealing elements, are used to create reliable seals at critical interfaces within the hub assembly. These thin, flexible rings deform to conform to mating surfaces, ensuring effective sealing against fluid leakage while adding minimal structural complexity compared to rigid sealing mechanisms.
3Temperature
If the hub divider restricts fluid egress from the inflow chamber, then cooling efficiency is improved, but fluid flow control precision deteriorates due to potential backflow
Solution Approach 1:
The hub divider creates separate inflow and outflow chambers with dedicated fluid channels for each chamber. This segmentation ensures that inflow fluid cannot backflow into the outflow chamber or mix with outflow fluid, maintaining precise flow control while restricting egress to the proper channels. The physical separation prevents cross-contamination and maintains cooling efficiency.
Solution Approach 2:
O-rings serve as intermediary sealing elements that prevent fluid leakage and backflow at the interfaces between hub components. These sealing rings ensure that fluid flow remains unidirectional through the designated channels, preventing backflow while maintaining efficient cooling. The O-rings create impermeable barriers that enforce proper flow direction without requiring complex flow control mechanisms.
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 design enhances the sealing efficiency of the cooling medium, preventing fluid leakage and ensuring effective heat dissipation, thereby improving the performance and reliability of the microwave ablation antenna assembly.
Implementation Method 1
a hub divider separating fluid inflow chamber from the fluid outflow chamber... an inflow tube insert adhered to the inflow tube member and interacting with the hub divider to form a seal
Implementation Method 2
Some microwave ablation antennae are cooled using compressed or liquefied CO2 gas, which during expansion absorbs energy from the antenna and particularly the coaxial cabling
Implementation Method 3
a circulating fluid, generally saline or deionized water, is pumped through the microwave ablation antenna assembly
Data Source
AI summary
A microwave ablation antenna assembly including a coaxial cable terminating in a radiating section, a first tubular member circumscribing the coaxial cable and spaced therefrom to permit fluid flow therebetween, and a second tubular member circumscribing the first tubular member and spaced therefrom to permit fluid flow therebetween. The microwave ablation antenna assembly further includes a hub configured to receive the coaxial cable, first tubular member, and second tubular member, the hub including a fluid inflow chamber and a fluid outflow chamber and an integrated hub divider and hub cap separating the fluid inflow chamber from the fluid outflow chamber and prohibiting fluid flow between the inflow chamber and outflow chamber except via the spacing between the coaxial cable and the first tubular member and between the first tubular member and the second tubular member.