Electrosurgical Instrument Low Impedance Path Arc Detection
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Solution Overview
Problem
Current electrosurgical instruments face challenges with limited field of view, leading to potential unintended arcing and tissue damage due to damaged insulation, and inadequate current shunting, particularly in resectoscopes, which can result in patient and surgeon injuries.
Innovation Solution
Implementing a low impedance path between the conductive body of the surgical instrument and a reference voltage to limit undesirable current flow, thereby preventing harmful currents from reaching the patient and reducing the risk of injury, while allowing the use of metallic sheaths without additional insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional laparoscopic electrosurgical tools are used with limited field of view, then the surgeon can perform minimally invasive surgery, but arcing may occur out of the surgeon's field of view causing undetected tissue injury
Solution Approach 1:
The patent introduces an intermediary monitoring system that includes a sensor coupled to the conductive body to detect arcing conditions. This intermediary detection mechanism operates independently of the surgeon's visual field, providing reliable monitoring of electrical arc conditions without requiring the surgeon to directly observe the arc site.
Solution Approach 2:
The system implements feedback control by continuously monitoring electrical parameters through the sensor coupled to the conductive body and providing real-time information to the control circuit. When arcing is detected, the system automatically adjusts or terminates RF power delivery, creating a closed-loop safety mechanism that responds to arc conditions regardless of the surgeon's field of view.
2Reliability
If insulation on the active electrode is damaged, then current can pass through to the patient's tissue causing injury, but the arcing may occur out of the surgeon's field of view and go undetected
Solution Approach 1:
The sensor acts as an intermediary detection device that monitors electrical arc conditions between the active electrode and conductive body without requiring direct visual observation. This intermediary monitoring system detects arcing caused by insulation damage even when the arc occurs outside the surgeon's field of view, providing reliable detection of harmful electrical conditions.
Solution Approach 2:
The patent replaces the mechanical/visual detection method (surgeon directly observing arcs) with an electrical sensing system. The sensor coupled to the conductive body detects electrical arc conditions through electrical field interaction, substituting the mechanical visual inspection with an electrical monitoring mechanism that can detect arcing regardless of spatial location relative to the surgeon's view.
3Reliability
If a safety shield and monitoring circuitry are used to deactivate the generator, then patient safety is improved, but device complexity increases
Solution Approach 1:
The sensor is designed to serve multiple functions: it monitors electrical arc conditions, detects insulation damage, and provides feedback for safe operation. By making the monitoring system multi-functional, the patent reduces the need for separate dedicated components for each safety function, thereby limiting the increase in device complexity while maintaining comprehensive patient safety.
Solution Approach 2:
The monitoring system is integrated into the existing electrosurgical instrument architecture, utilizing the conductive body and control circuit that are already present in the device. The sensor works within the existing power delivery and control infrastructure, allowing the system to self-monitor and self-regulate without requiring entirely separate external monitoring equipment, thus minimizing added complexity.
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 solution effectively reduces the risk of patient and surgeon injury by limiting current flow through the low impedance path, maintaining the conductive body at a potential close to the patient's voltage, and allowing the use of metallic sheaths, enhancing safety and durability in electrosurgical procedures.
Implementation Method 1
imparting a voltage to the active electrode so as to generate current in the current path... any undesirable current flow that would otherwise flow from the active electrode to the reference voltage through the patient, conductive body and the low impedance path is limited
Implementation Method 2
there can be many centimeters of the active electrode which extend between the entry point in a patient's body and the surgeon's field of view... the insulated active electrode may unintentionally come into contact with unknown tissue of the patient
Implementation Method 3
The dielectric between these elements is the insulation on the active electrode. Current from the active electrode will be capacitively coupled to the trocar sheath
Data Source
AI summary
A system and method for performing an electrosurgical procedure are disclosed. The method includes applying an active electrode to a patient and placing a return electrode on the patient so as to create a current path in tissue of the patient between the active electrode and the return electrode. A conductive element, which is operatively coupled to the active electrode, is coupled to a reference voltage with a low impedance path and a voltage is imparted to the active electrode so as to generate current in the current path. Any undesirable current flow that would otherwise flow from the active electrode to the reference voltage through the patient is limited to reduce a risk of harm to the patient.