Multi-Channel RF Impedance Sensing for Automatic Tissue-Effect Switching
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Solution Overview
Problem
Existing electrosurgical systems require manual switching between tissue effects like ablation and coagulation based on visual inspection, leading to prolonged surgical procedures and potential excessive bleeding.
Innovation Solution
An electrosurgical system that performs a first electrosurgical activity with energy at a first frequency and simultaneously measures an electrosurgical parameter using energy at a second frequency, allowing automatic switching between tissue effects based on detected changes in impedance at the characteristic frequencies of plasma, tissue, bone, and fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual switching between ablation and coagulation modes is used, then the surgeon can control tissue effects, but the surgical procedure duration increases and excessive bleeding may occur
Solution Approach 1:
The system continuously monitors impedance at multiple frequencies to detect tissue state changes (plasma formation, bleeding, coagulation) and automatically adjusts energy delivery parameters and mode switching based on real-time feedback, eliminating manual intervention delays
Solution Approach 2:
The system performs self-monitoring and self-adjustment of electrosurgical parameters by detecting impedance changes at characteristic frequencies of different tissue states, enabling automatic mode transitions without surgeon intervention
2Loss of information
If visual inspection is used to detect bleeding, then the surgeon can identify tissue effects, but excessive bleeding may have already occurred by the time of detection
Solution Approach 1:
The system continuously monitors impedance at characteristic frequencies of blood and plasma before visual signs of excessive bleeding appear, enabling early detection and preventive action by switching to coagulation mode before significant blood loss occurs
Solution Approach 2:
The system replaces visual inspection with electrical impedance measurement at characteristic frequencies, providing objective, real-time detection of tissue state changes including plasma formation, bleeding, and coagulation without relying on surgeon visual assessment
3Adaptability or versatility
If manual mode switching is performed, then the surgeon can adapt to different tissue effects, but the procedure complexity increases
Solution Approach 1:
The system automatically detects tissue state changes through multi-frequency impedance monitoring and self-adjusts energy delivery parameters and mode transitions, eliminating the need for manual switching operations by the surgeon
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
Facilitates rapid and precise control of electrosurgical procedures, reducing surgical time and improving patient outcomes by automatically adjusting between ablation and coagulation modes without manual intervention.
Implementation Method 1
performing a first electrosurgical activity by way of first energy at a first frequency applied to a tissue
Implementation Method 2
measuring an electrosurgical parameter by way of a second energy at a second frequency applied to the tissue, the second frequency different than the first frequency
Data Source
AI summary
Electrosurgical systems and methods. At least one example embodiment is a method including: performing a first electrosurgical activity by way of first energy at a first frequency applied to an active electrode of an electrosurgical wand, the application of the first energy by way of an electrosurgical generator, and the first electrosurgical activity produces a first effect that is tissue-altering; and measuring an electrosurgical parameter by way of a second energy at a second frequency applied to the active electrode, the measuring simultaneously with the performing of the first electrosurgical activity, and the second frequency different than the first frequency.