Flexible Electrosurgical Electrode Beveled Surface Heat Removal
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Solution Overview
Problem
Current aspirating ablator electrodes face inefficiencies due to high power requirements for process heat removal, leading to increased fluid temperature and thermal injuries, and are complex to manufacture in various angles for different surgical procedures, making them costly and difficult to use in small cannulae.
Innovation Solution
A simple, monolithic active electrode with a beveled and contoured surface, featuring a centralized aspiration port and flexible design, allowing for various angles and efficient waste heat removal without compromising ablation efficiency, suitable for use in small cannulae and diverse surgical environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high power levels are used for bulk tissue vaporization, then ablation efficiency is improved, but fluid temperature increases and thermal injuries occur
Solution Approach 1:
The invention extracts and removes waste heat from the system through an integrated aspiration channel that draws away heated conductive fluid from the ablation site. This prevents heat accumulation in the joint space, allowing high power ablation to proceed without causing thermal injuries to surrounding tissues.
Solution Approach 2:
The conductive fluid serves as an intermediary medium that absorbs excess heat from the ablation process and transports it away from the surgical site. The aspiration system enhances this natural cooling mechanism by actively removing heated fluid, thereby mediating between the high-power energy source and the sensitive surrounding tissues.
2Object-affected harmful factors
If aspirating ablators are designed to remove process heat, then thermal injury risk is reduced, but ablation efficiency decreases due to heat loss
Solution Approach 1:
The aspiration channel is strategically positioned and dimensioned to remove only waste heat from specific zones while preserving the thermal environment needed for effective ablation at the active electrode surface. The localized aspiration approach maintains the temperature gradient necessary for efficient tissue vaporization while preventing overheating of surrounding structures.
3Adaptability or versatility
If ablator electrodes are manufactured in various angles for different procedures, then surgical versatility is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The active electrode is designed as a universal component that can be configured for multiple surgical applications. By positioning the aspiration channel at its proximal end rather than integrating it into the distal tip, the electrode maintains a simplified geometry that can be adapted to various angles and procedural requirements without requiring complex manufacturing processes for each variant.
4Ease of operation
If aspiration ports are positioned at the distal tip, then bubble removal is improved, but device profile increases making it difficult to use in small cannulae
Solution Approach 1:
The aspiration function is relocated from the distal tip to the proximal end of the active electrode, utilizing the longitudinal dimension of the device rather than expanding the transverse profile. This dimensional repositioning allows effective aspiration of bubbles and debris while maintaining a compact device that can pass through small cannulae.
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 reduces the risk of thermal injuries by efficiently removing waste heat, lowers manufacturing costs, and allows for a wide range of angled configurations, enhancing surgical efficiency and accessibility through a single component design.
Implementation Method 1
During ablation, current flows from the ablator into the conductive fluid and heats the fluid to its boiling point. Heating of the conductive fluid is proportional to the density of electrical current flowing from the electrode into the fluid.
Implementation Method 2
In general, regions of high current density occur at the corners and edges of the electrode.
Implementation Method 3
Steam bubbles form first at the edges of an ablator but eventually cover virtually the electrode's entire surface.
Implementation Method 4
Ablator electrodes are used in an environment filled with electrically conductive fluid.
Data Source
AI summary
Disclosed herein is a flexible single piece active element for use in connection with aspirating electrosurgical ablators, particularly those configured for bulk tissue vaporization. The active electrode elements of the present invention provide a simple construction suitable for use with a wide array of electrosurgical components and adjustable to wide range of angled positions to permit access to a variety of tissues, in an array of diverse environments and address a host of ablation needs. Additionally, the novel geometry and positioning of both ablation surface and aspiration ports permit aspiration flow to remove primarily waste heat rather than process heat, to thereby improve vaporization efficiency and reduce procedure time. Thus, active electrodes and ablation devices of the present invention maximize efficiency and adaptability while minimizing manufacturing cost and device profile.