Waveguide Isolator with Series Capacitors for RF Microwave Isolation
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Solution Overview
Problem
Existing electrosurgical apparatuses face challenges in isolating radiofrequency (RF) and microwave energy channels effectively, leading to potential leakage and inefficiencies in energy delivery during surgical procedures, particularly in endoscopic procedures where precise control of energy is crucial for minimizing blood loss and maintaining clear vision.
Innovation Solution
A combined isolator-diplexer device is introduced, featuring a waveguide isolator with series-connected capacitive structures to reduce capacitive coupling, ensuring high voltage withstand and preventing leakage between RF and microwave energy channels, allowing for simultaneous delivery of RF and microwave energy while maintaining isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a waveguide isolator is used to isolate microwave channel from RF energy, then isolation effectiveness is improved, but device complexity increases due to additional components
Solution Approach 1:
The patent combines the waveguide isolator and diplexer into a single integrated device. The waveguide isolator uses a conductive input section, conductive output section, and conductive intermediate section that together enclose a waveguide cavity. This merging eliminates the need for separate isolation components while maintaining isolation effectiveness between microwave and RF channels.
Solution Approach 2:
The combined isolator-diplexer device performs multiple functions simultaneously: it isolates the microwave channel from RF energy, combines RF and microwave signals, and provides signal pathway separation. The waveguide isolator structure serves both as an isolation mechanism and as part of the signal combining architecture, reducing overall system complexity.
2Reliability
If series-connected capacitive structures are used to reduce capacitive coupling, then energy leakage is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The capacitive structures act as intermediary elements between the conductive sections of the waveguide isolator. These capacitive structures, positioned at specific locations within the waveguide cavity, reduce capacitive coupling between RF and microwave channels. The intermediate section of the waveguide isolator provides a physical structure that accommodates these capacitive elements while maintaining the overall isolation function.
3Productivity
If RF and microwave energy are delivered simultaneously through a common signal pathway, then productivity is improved, but energy interference increases
Solution Approach 1:
The device segments the signal pathway into distinct RF and microwave channels that converge at the output. The waveguide isolator separates the conductive input section (RF channel) from the conductive output section (microwave channel) through an intermediate section. This segmentation allows simultaneous energy delivery while preventing interference through physical and electromagnetic separation.
Solution Approach 2:
The capacitive structures in the waveguide isolator are designed to handle high voltage and energy loads temporarily during simultaneous RF and microwave delivery. These elements provide temporary energy isolation and protection, allowing the system to tolerate short-term high-stress conditions during surgical procedures.
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
The solution effectively isolates RF and microwave energy channels, preventing leakage and ensuring efficient energy delivery, which enhances surgical precision and reduces blood loss during procedures by allowing for simultaneous cutting and coagulation with minimal energy wastage.
Implementation Method 1
The first DC isolation barrier and the second DC isolation barrier provide a pair of series-connected capacitive structures between the ground conductor of the output from the combining circuit and the conductive input section of the waveguide isolator, the capacitive structure being arranged to inhibit coupling of the RF EM energy and leakage of the microwave EM energy
Implementation Method 2
a waveguide isolator connected to isolate the microwave channel from the RF EM radiation
Implementation Method 3
featuring a waveguide isolator with series-connected capacitive structures to reduce capacitive coupling
Data Source
AI summary
A combined isolator-diplexer device for supplying radiofrequency (RF) energy and microwave energy obtained from separate sources to a probe via a common signal pathway. The invention combines into a single unit all the necessary components to isolate a microwave channel from an RF channel whilst providing a high withstanding voltage (e.g. greater than 10 kV). The device comprises a waveguide isolator for isolating the microwave channel having a pair of DC isolation barriers arranged therein to provide a pair of series-connected capacitive structures between a ground conductor at an output of the combining circuit and a conductive input section of the waveguide isolator.