Electrosurgical Probe with Star-Shaped Tip for Self-Clearing Aspiration
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Solution Overview
Problem
Existing electrosurgical ablators face inefficiencies in high power requirements and increased heating due to large electrode areas and inefficient aspiration designs, leading to decreased tissue removal rates and potential thermal injuries.
Innovation Solution
An electrosurgical probe with a metallic tip and dielectric insulator featuring a central lumen for aspiration and protuberances in a star-shaped pattern, reducing electrode surface area and creating a high current density zone for efficient ablation at low RF power levels, while maintaining effective suction and self-clearing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electrode surface area is increased to improve ablation effectiveness, then the ablation capability is enhanced, but the RF power requirement increases and waste heat generation increases
Solution Approach 1:
The patent applies local quality by creating a high current density zone at the tip of the probe through specific shaping of the dielectric insulator and metallic electrode tip. This concentrates the RF energy locally at the treatment site rather than distributing it across a large electrode surface, achieving effective ablation with reduced overall power requirements and less waste heat generation.
2Productivity
If the electrode surface area is increased to improve ablation effectiveness, then the ablation capability is enhanced, but thermal injury risk increases due to increased waste heat
Solution Approach 1:
By concentrating RF energy delivery to a localized high current density zone at the probe tip through optimized dielectric and electrode shaping, the patent achieves effective tissue ablation while limiting the volume of tissue exposed to excessive heat, thereby reducing the risk of thermal injury to surrounding healthy tissues.
3Productivity
If aspiration flow rate is increased to improve debris removal, then the suction effectiveness is enhanced, but the device complexity and power requirements increase
Solution Approach 1:
The patent merges the aspiration function with the electrosurgical probe structure by integrating the aspiration lumen within the probe body and combining the suction mechanism with the RF energy delivery system. This integration achieves effective debris and bubble removal while avoiding the complexity of separate, independent aspiration systems.
4Power
If the probe impedance is decreased through larger electrode area, then the RF power delivery is improved, but the overall system efficiency decreases
Solution Approach 1:
The patent resolves this contradiction by creating a localized high current density zone at the probe tip through optimized shaping of the dielectric insulator and metallic electrode. This approach maintains effective RF power delivery to the treatment site while minimizing energy losses in the surrounding tissue and cable system, thereby improving overall system efficiency despite the relatively small overall electrode surface area.
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 probe achieves high ablation rates with consistent and aggressive suction at low RF power levels, reducing waste heat generation and minimizing thermal injuries, thereby improving surgical efficiency and safety.
Implementation Method 1
Radiofrequency (RF) probes employed in electrosurgical procedures... the RF current flows from an exposed active electrode through the patient's body... Electrosurgery is the intentional passage of high frequency current through tissue to achieve a controlled surgical effect
Implementation Method 2
Aspiration ports in the ablator are often provided to remove ablated tissue and debris... The aspiration portal is connected to an external vacuum source which provides suction for bubble evacuation
Implementation Method 3
The central lumen or 'chimney' for directing aspiration flow is circumferentially surrounded by a plurality of protuberances having various geometries and being spaced from each other by a plurality of grooves
Implementation Method 4
The shape of the dielectric insulator and of the probe tip can significantly affect ablation. By properly shaping the insulator and the electrode tip, the threshold power can be substantially decreased
Implementation Method 5
The aspiration portal is connected to an external vacuum source which provides suction for bubble evacuation
Data Source
AI summary
A high efficiency electrosurgical electrode with an advanced electrically conductive tip and aspiration port, and a method of conducting an electrosurgical procedure with such electrode. The electrosurgical electrode comprises an electrically conductive tip with a central lumen or “chimney” surrounded by a plurality of protuberances. The central lumen or “chimney” is “self-cleaning” and/or “self-clearing” in that any tissue passing through the central lumen that might cause a clog is quickly denatured by the surrounding electrode and aspirated from the ablation site, so that the probe does not require special consideration by the user (for example, replacement due to total loss of suction). The plurality of protuberances have various forms and geometries that define a plurality of recesses and that, in one embodiment, are provided in a “star-shaped” or partial “star-shaped” pattern.