Ultrapolar Laparoscopic Electrode Layout to Eliminate Capacitive Coupling
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Solution Overview
Problem
Laparoscopic monopolar electrosurgery causes indirect thermal injuries due to capacitive coupling and excessive tissue damage, as current passes through the patient's body and non-targeted tissues, leading to burns and vaporization.
Innovation Solution
A laparoscopic ultrapolar electrosurgery device with integrated active and return electrodes within the same device, eliminating the need for a patient-mounted return electrode and reducing capacitive coupling by creating a closed circuit through tissue, thus minimizing power usage and thermal injuries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If monopolar electrosurgery is used, then cutting and coagulation effectiveness is improved, but thermal injury and tissue necrosis increase due to current passing through patient's body
Solution Approach 1:
The patent combines both active and return electrodes within the same laparoscopic instrument, creating an integrated ultrapolar electrosurgery device. This merging eliminates the need for a separate return electrode on the patient's body, confining current flow to the immediate surgical site between the two electrodes, thereby maintaining cutting effectiveness while preventing thermal injury to distant tissues.
Solution Approach 2:
The patent extracts the return electrode from the patient's body and relocates it to the surgical instrument itself. By taking out the return electrode from its traditional external position and integrating it into the instrument, the current path is restricted to the surgical site, eliminating harmful thermal effects on non-targeted tissues while preserving electrosurgical functionality.
2Adaptability or versatility
If monopolar electrosurgery is used, then versatile cutting capability is achieved, but indirect thermal injury occurs through capacitive coupling and direct contact with metal instruments
Solution Approach 1:
The patent merges the active and return electrodes into a single integrated instrument, creating a self-contained electrosurgical system. This configuration ensures that current flow is strictly confined between the two electrodes at the surgical site, eliminating capacitive coupling with external metal instruments and preventing indirect thermal injury while maintaining versatile cutting capability.
Solution Approach 2:
The patent introduces tissue as an intermediary between the active and return electrodes, requiring current to flow through the tissue directly at the surgical site rather than through metal instruments or capacitive coupling. This intermediary approach eliminates indirect thermal injury pathways while preserving effective tissue cutting and coagulation.
3Reliability
If return electrode is placed on patient's back, then complete electrical circuit is formed, but excessive heat is generated causing tissue damage
Solution Approach 1:
The patent inverts the traditional monopolar configuration by placing both electrodes at the surgical site rather than separating them. Instead of one electrode on the patient's body and another on the instrument, both electrodes are integrated into the same instrument, reversing the spatial arrangement and confining current flow to the immediate surgical site, thereby preventing excessive heat generation while maintaining circuit completion.
Solution Approach 2:
The patent applies local quality by concentrating both electrodes and the resulting current flow locally at the surgical site. This localized configuration ensures that electrical energy is deposited precisely where needed for cutting and coagulation, preventing excessive heat generation in distant tissues while maintaining reliable electrical circuit completion at the target site.
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 device reduces thermal injuries and tissue necrosis by eliminating capacitive coupling and minimizing power requirements, ensuring safe and effective cutting and coagulation during laparoscopic procedures.
Implementation Method 1
Electrosurgery uses an RF electrosurgical generator (also known as an electrosurgical unit or ESU) and a handpiece with an electrode to provide high frequency, alternating radio frequency (RF) current input at various voltages to cut or coagulate biological tissue.
Implementation Method 2
a return electrode having a conductive hollow tubular member with first and second ends and a conductive appendage extending beyond the first conductive end
Implementation Method 3
an actuator contained within the handpiece member in communication with the active electrode to move the active electrode toward the conductive appendage of the return electrode when the device is activated for cutting and/or coagulation
Data Source
AI summary
A laparoscopic ultrapolar electrosurgery device having both active and return electrodes that reduces potential injury to patients during laparoscopic surgery by eliminating capacitive coupling when employing an electrosurgical handpiece device for cutting and/or coagulating tissue.