Bipolar Electrosurgical Generator With Phase-Angle Endpoint Control
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Solution Overview
Problem
Existing electrosurgical systems face challenges in providing consistent surgical outcomes due to variations in tissue type and instrument geometry, leading to inconsistent tissue coagulation, fusion, or cutting endpoints, and require costly recalibration for different instruments, while bipolar instruments are sensitive to surgeon skill and tissue damage risks.
Innovation Solution
An electrosurgical system with an advanced bipolar electrosurgical instrument and generator that includes a memory module for data exchange, allowing the generator to determine optimal RF energy delivery based on connected instruments and tissue type, and a controller that monitors phase angle to terminate energy delivery at precise endpoints, reducing tissue damage and enhancing consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If monopolar electrosurgical instruments are used to deliver electrical energy, then cutting and coagulation effects are achieved, but patient injury risk increases due to electrical burns from the return electrode
Solution Approach 1:
The patent introduces an impedance monitoring system as an intermediary between the power source and tissue. This intermediary continuously measures tissue impedance during energy delivery and provides real-time feedback to control the electrosurgical generator, preventing harmful overheating and burns while maintaining effective cutting and coagulation.
Solution Approach 2:
The system implements closed-loop feedback by continuously monitoring tissue impedance and using this information to automatically adjust power delivery. The impedance feedback mechanism detects tissue coagulation status and terminates energy delivery at the optimal endpoint, eliminating the need for surgeon estimation and preventing over-treatment injuries.
2Object-affected harmful factors
If bipolar electrosurgical instruments are used to reduce patient injury risk, then electrical burn risk is minimized, but surgical outcomes become highly dependent on surgeon skill
Solution Approach 1:
The electrosurgical system performs self-monitoring and self-adjustment by automatically measuring tissue impedance and controlling power delivery without requiring surgeon intervention. The system autonomously determines the optimal treatment endpoint based on real-time impedance changes, making the procedure independent of surgeon experience or estimation skills.
Solution Approach 2:
The patent replaces the mechanical/skill-based assessment of tissue coagulation with an electrical impedance measurement system. Instead of relying on surgeon skill to visually or tactilely assess tissue fusion, the system uses electrical impedance as an objective, quantifiable parameter to automatically determine treatment completion.
3Reliability
If previous electrosurgical systems monitor ohmic resistance or temperature to terminate electrical energy, then some control is achieved, but inconsistent results occur for varied tissue types and combined tissue masses
Solution Approach 1:
The system dynamically changes the monitoring parameter from static ohmic resistance or temperature thresholds to real-time impedance spectroscopy that captures the frequency-dependent electrical properties of tissue. This parameter transformation allows the system to adapt to different tissue types and compositions by analyzing impedance characteristics across multiple frequencies, providing consistent results regardless of tissue variability.
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 system provides consistent and precise tissue fusion and cutting by optimizing RF energy delivery, minimizing tissue damage, and eliminating the need for costly recalibration, thereby improving surgical outcomes and safety.
Implementation Method 1
electrical energy is used to coagulate, fuse, or cut tissue to which it is applied
Implementation Method 2
monitor an ohmic resistance or tissue temperature during the electrosurgical procedure
Data Source
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AI summary
An electrosurgical generator arranged to supply radio frequency (RF) energy to fuse tissue is provided. The generator is arranged to supply RF energy through a removably coupled electrosurgical instrument to fuse tissue grasped by the instrument. The generator monitors a phase angle of the supplied RF energy and adjusts or terminates the supplied RF energy based on the monitored phase angle in comparison to predetermined thresholds and conditions to optimally fuse the tissue. The electrosurgical instrument conducts radio frequency energy to fuse tissue captured between the jaws and a blade to mechanically cut tissue between the jaws. A conductive post positioned on the jaw adjacent to the blade