Pulsed Plasma Electrosurgical System Eschar Management
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Solution Overview
Problem
Conventional electrosurgical systems face challenges in effectively removing debris and maintaining focused plasma beams during tissue ablation and tumor removal procedures, as continuous plasma application leads to eschar formation, which disperses the plasma beam and reduces effectiveness.
Innovation Solution
An electrosurgical system that generates a pulsed plasma stream by modulating and pulsing the gas flow, using a plasma generator coupled with an electrosurgical generator to create a plasma stream with noble gases like helium or argon, and employing a flow controller to manage gas flow, ensuring each pulse dislodges and removes eschar while maintaining focused plasma application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous plasma application is used for tissue ablation, then tissue removal is achieved, but eschar formation disperses the plasma beam and reduces effectiveness
Solution Approach 1:
The patent applies periodic pulsing of the plasma beam rather than continuous application. The controller delivers plasma in repeated pulses with intervals between them, allowing the eschar to be disrupted before it can form a continuous barrier. This periodic action maintains plasma beam focus while achieving tissue ablation over time.
Solution Approach 2:
The system dynamically adjusts the plasma delivery by varying pulse duration, pulse interval, and pulse amplitude. This dynamic control allows optimization of tissue removal while preventing eschar formation that would dispers the plasma beam, thereby maintaining reliability of plasma focus throughout the procedure.
2Productivity
If continuous plasma application is used, then tissue ablation proceeds, but debris removal becomes difficult and plasma beam focus is lost
Solution Approach 1:
By pulsing the plasma beam periodically, the system creates intermittent forces that help dislodge debris and eschar between plasma pulses. This makes debris removal easier while maintaining productive tissue ablation, as the periodic mechanical disturbance prevents debris accumulation that would otherwise block the plasma beam.
3Power
If high power plasma is applied continuously, then tissue ablation is effective, but cooling is insufficient in temperature-sensitive applications
Solution Approach 1:
The periodic pulsing of high-power plasma allows brief intervals between pulses where cooling can occur. During these intervals, the tissue has time to dissipate heat, preventing excessive temperature accumulation in temperature-sensitive applications while still delivering effective ablation power during the active plasma pulses.
Solution Approach 2:
The system dynamically controls the duty cycle of plasma delivery, adjusting the ratio of pulse duration to pulse interval. This allows optimization between delivering sufficient power for effective ablation and providing adequate cooling time for temperature-sensitive tissues, enabling precise thermal management.
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 pulsed plasma stream effectively accelerates debris removal and maintains a focused plasma beam, enhancing tissue ablation and tumor removal efficiency by preventing eschar barrier formation and providing increased cooling in low-power applications.
Implementation Method 1
A noble gas conduit coupled to a noble gas source to feed noble gas such as helium or argon to the electrode. The electrode generates the plasma stream by ionizing the noble gas to create a conductive pathway for electrical energy delivery.
Implementation Method 2
A flow controller is further provided to modulate and/or pulse the flow of the carrier or noble gas from the gas source to the gas conduit such that when the electrode is energized pulses of plasma discharge are generated at the surgical site.
Implementation Method 3
The plasma conducts the energy by providing a pathway of relatively low electrical resistance. The electrosurgical energy will follow through the plasma to cut, coagulate, desiccate, or fulgurate blood or tissue of the patient.
Implementation Method 4
Due to the pressure build-up of the carrier gas between pulses, a substantial impulse of gas occurs upon each applied pulse. This impulse of gas will assist in electrosurgical applications such as tissue ablation, tumor removal, etc. by accelerating the removal of debris.
Implementation Method 5
Furthermore, the rapid inrush of gas increases cooling in low power temperature-sensitive applications.
Data Source
AI summary
An electrosurgical system to generate a pulsed plasma stream and method thereof are provided. The system includes an electrosurgical generator coupled to an electrical power source to supply power for the electrosurgical system; a plasma generator including a noble gas conduit and an electrode disposed with the noble gas conduit, the electrode operatively coupled to the electrosurgical generator to selectively receive electrical energy therefrom such that the electrode at least partially ionizes a carrier gas feed to the noble gas conduit to create a plasma discharge; and a flow controller coupled to the noble gas conduit to pulse the flow of the carrier gas from a gas source to the noble gas conduit such that when the electrode is energized pulses of plasma discharge are generated at the surgical site.