Floating Electrode Plasma Resection for Tissue Vaporization
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Solution Overview
Problem
Current electrosurgical instruments face inefficiencies due to undesired tissue heating, electrical shorting, and ineffective bubble control, particularly in conductive environments, leading to reduced efficiency and longer procedure times, and often fail to utilize the electrical properties of surrounding fluids and tissues effectively.
Innovation Solution
The introduction of a floating electrode design in electrosurgical devices that is electrically isolated from the power supply circuit, allowing it to contact surrounding liquids and tissues, concentrating power density near the active electrode for efficient liquid heating, steam bubble formation, and arc creation, thereby enhancing probe efficiency and reducing the need for high RF power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bipolar electrosurgical devices operate at low voltage to prevent electrical shorting between electrodes, then device safety is improved, but sparking efficiency and tissue vaporization capability deteriorate
Solution Approach 1:
The patent introduces a dielectric barrier (insulating coating) between the active and return electrodes, which acts as an intermediary to prevent direct electrical shorting while allowing the device to operate at higher voltages. This dielectric layer enables efficient sparking and plasma formation without causing electrode shorting, thus resolving the contradiction between safety and vaporization efficiency
Solution Approach 2:
The patent changes the operating voltage parameter from low voltage (100-500V) to higher voltage operation, made possible by the dielectric barrier. This parameter change enables more efficient plasma generation and tissue vaporization while the dielectric coating prevents electrical shorting, simultaneously achieving both safety and productivity goals
2Ease of operation
If bipolar devices use close proximity of active and return electrodes to confine current path, then current control is improved, but tissue heating and coagulation at return electrode contact point worsen
Solution Approach 1:
The patent applies different properties to different parts of the electrode system: the active electrode has a dielectric barrier coating to control sparking, while the return electrode uses a large surface area contact with tissue to distribute current density. This local quality differentiation prevents concentrated heating at the return electrode while maintaining current path control
Solution Approach 2:
The patent segments the electrode system into distinct functional components: an active electrode with dielectric coating for controlled sparking, and a separate return electrode with large surface area for safe current dissipation. This segmentation allows each component to optimize its function without the drawbacks of the other
3Adaptability or versatility
If monopolar devices use external grounding plates for current return, then current path flexibility is improved, but patient burn risk from undefined current paths worsens
Solution Approach 1:
The patent introduces a dielectric barrier as an intermediary between the active electrode and the conductive fluid, which controls and confines the current path. This dielectric layer prevents current from taking undefined paths through patient tissue while still allowing the procedure to be performed with conductive irrigation fluids present
Solution Approach 2:
The patent converts the potentially harmful effect of conductive irrigation fluids (which can cause electrical shorting) into a beneficial element by using the dielectric barrier to control plasma formation at the active electrode while preventing uncontrolled current paths. The conductive fluid becomes part of the controlled plasma generation process rather than a source of danger
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 increases the efficiency of electrosurgical procedures by allowing for more controlled and efficient tissue vaporization and coagulation, reducing the risk of patient burns and unintended tissue injury, while also enabling effective use in both conductive and non-conductive environments.
Implementation Method 1
Spark generation in gaseous bubbles in liquid, or alternatively as plasma
Implementation Method 2
The electrosurgical instrument relies on generation of electrical arcs in gaseous bubbles in liquid to vaporize tissue
Implementation Method 3
concentrating power density near the active electrode for efficient liquid heating, steam bubble formation
Data Source
AI summary
Disclosed herein are embodiments of an electrosurgical device that include one or more floating electrodes and are specifically adapted to remove, resect, ablate, vaporize, denaturize, coagulate and form lesions in soft tissues, preferably in combination with a resectoscope, particularly in the context of urological, gynecological, laparoscopic, arthroscopic, and ENT procedures. Specific adaptations for urological and gynecological applications, for example BPH treatment, are also described.