Electrosurgical Controller Impedance Feedback for Coagulation Fluid Control
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Solution Overview
Problem
During coagulation procedures, excess saline can pool at the surgical site, leading to heated saline runoff, which damages healthy tissue and reduces procedure visibility, as the saline has lower impedance than tissue and shunts electrical current, causing overheating and potential burns.
Innovation Solution
An electrosurgical controller that measures impedance between electrodes and adjusts the flow of conductive fluid and RF energy based on impedance values, decreasing fluid flow as impedance decreases and increasing it as impedance increases, to maintain optimal tissue contact and prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If saline is supplied to the surgical site during coagulation, then tissue contact is maintained and coagulation is enabled, but saline pools at the tip and causes heated runoff that damages healthy tissue
Solution Approach 1:
The system continuously measures impedance between electrodes and uses this feedback to dynamically control saline flow rate. When impedance decreases (indicating saline pooling), the controller reduces or stops saline delivery, preventing heated runoff while maintaining sufficient tissue contact for coagulation.
Solution Approach 2:
The saline flow rate is made dynamic rather than static, automatically adjusting in real-time based on impedance measurements. The system transitions from constant flow to variable flow that responds to changing tissue conditions and saline accumulation.
2Reliability
If saline flow is increased to maintain tissue contact, then coagulation effectiveness is improved, but impedance decreases indicating saline pooling which causes overheating
Solution Approach 1:
The impedance measurement provides real-time feedback on saline accumulation. When impedance drops below a threshold (indicating excessive saline and potential overheating), the controller automatically reduces saline flow to prevent temperature rise while maintaining enough saline for effective coagulation.
Solution Approach 2:
The system changes the saline flow parameter dynamically based on impedance measurements. The flow rate is adjusted up or down in response to impedance changes, optimizing both coagulation effectiveness and temperature control.
3Reliability
If saline is supplied to ensure adequate tissue contact, then coagulation can be performed, but visibility at the surgical site is reduced due to saline pooling
Solution Approach 1:
Impedance monitoring provides real-time information about saline accumulation that directly affects visibility. The controller uses this feedback to reduce saline flow when pooling is detected, maintaining visibility while ensuring sufficient tissue contact for coagulation.
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 approach reduces the risk of heated saline runoff, maintains effective tissue contact, and improves procedural visibility by dynamically controlling fluid and energy delivery based on real-time impedance measurements.
Implementation Method 1
measuring, by the electrosurgical controller, a value indicative of impedance of tissue and conductive fluid between the two electrodes
Implementation Method 2
applying, by an electrosurgical controller, radio frequency (RF) energy between two electrodes of a coagulation wand, the two electrodes abutting tissue at a surgical site, and the RF energy at a coagulation energy
Implementation Method 3
supplying, by the electrosurgical controller, a flow of conductive fluid to the surgical site
Data Source
AI summary
Method and system of control of conductive fluid during coagulation using radio frequency energy. At least one example is of sealing blood vessels, the method comprising: applying, by an electrosurgical controller, radio frequency (RF) energy between two electrodes of a coagulation wand, the two electrodes abutting tissue at a surgical site, and the RF energy at a coagulation energy; supplying, by the electrosurgical controller, a flow of conductive fluid to the surgical site; measuring, by the electrosurgical controller, a value indicative of impedance of tissue and conductive fluid between the two electrodes; and decreasing, by the electrosurgical controller, the flow of conductive fluid as the value indicative of impedance decreases.