Electrosurgical Cable Double Helix Stray RF Radiation
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Solution Overview
Problem
Existing electrosurgical systems face challenges in minimizing energy loss and stray RF energy radiation during the transmission of electrosurgical radio frequency energy, which affects both the efficacy of treatments and the safety of patients and surgeons due to uncontrolled capacitive coupling and RF noise interference.
Innovation Solution
The implementation of an electrosurgical cable with a double helix geometric orientation of supply and return leads to minimize stray RF radiation through close proximity electrical field coupling, reducing capacitive reactance and enhancing energy delivery by controlling inductive and capacitive components, and the integration of sensors to monitor and adjust energy delivery based on tissue parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional electrosurgical cable transmission is used, then energy can be delivered to the treatment site, but stray RF energy is radiated along the cable path reducing treatment energy and generating RF noise
Solution Approach 1:
The patent applies the principle of converting harmful stray RF radiation into beneficial field cancellation by arranging supply and return leads in close proximity with opposite polarity. The harmful radiated fields from each lead cancel each other out, transforming the potential harm of RF radiation into a beneficial reduction of stray energy and RF noise interference.
Solution Approach 2:
The patent changes the geometric parameters of cable construction by arranging supply and return leads in close proximity with specific spacing and orientation. This parameter change transforms the cable from a source of stray RF radiation to a low-radiation transmission medium, reducing both energy loss and RF noise.
2Power
If electrical fields are generated through the cable for energy transmission, then RF energy can be delivered to tissue, but the electrical fields interfere with other electronic equipment in the surgical area
Solution Approach 1:
The patent converts the harmful electrical fields that interfere with electronic equipment into beneficial canceling fields. By positioning supply and return leads in close proximity with opposite polarity, the fields that would normally cause interference are arranged to cancel each other out, reducing electromagnetic interference with monitoring and other surgical equipment.
3Loss of energy
If close proximity electrical field coupling is used, then stray RF energy is minimized, but the cable structure becomes more complex
Solution Approach 1:
The patent merges the supply and return leads into a single integrated cable structure with close proximity arrangement. This combining of functions into a unified cable design achieves field cancellation and reduces stray RF energy while managing the structural complexity through integrated construction rather than separate components.
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 approach significantly reduces energy loss and RF noise, improving the safety and efficiency of electrosurgical procedures by maximizing applied energy and minimizing stray radiation, while allowing for precise control of energy delivery to achieve optimal tissue treatment outcomes.
Implementation Method 1
close proximity electrical field coupling between a supply and return transmission leads
Implementation Method 2
The coupling maximizes application of the RF energy delivered during surgery and minimizes the stray RF energy radiated by the supply and return leads. Close proximity electrical field coupling significantly reduces the electrical field via field cancellation
Implementation Method 3
the geometric cable orientation controls the loss of stray RF energy, which is contained to a predetermined level and also reduces capacitive loading to the energy source
Implementation Method 4
Coupling provides a low loss inductive/capacitive ('LC') transmission medium via a three-dimensional geometric orientation of the supply and return leads
Implementation Method 5
Transmission of electrosurgical energy to the treatment site, namely from the electrosurgical generator to the instrument, is accomplished via an electrosurgical cable
Implementation Method 6
capacitive reactance is caused by an antenna effect (e.g., radiative discharge of stray RF energy in air) for transmission mediums shorter than half a wavelength
Data Source
AI summary
An electrosurgical system is disclosed. The system includes an electrosurgical instrument having at least one electrode configured as a first sensor for measuring a voltage drop therethrough and a temperature sensor for a thermal sensor configured to measure a temperature difference across the at least one electrode; and a generator including an output stage coupled to the at least one electrode, the output stage configured to generate radio frequency energy; and a controller configured to determine actual radio frequency current based on the voltage drop and electrical resistivity of the at least one electrode and radio frequency power based on the measured temperature difference and the thermal conductivity of the at least one electrode.