Electrosurgical Controller RF Energy Control via Transformer Turns
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Solution Overview
Problem
Existing electrosurgical systems often require a single RF energy output for both ablation and coagulation modes, which limits control over energy levels and increases costs due to the need for reactive elements in the wand, such as inductors or capacitors, to achieve lower coagulation voltages.
Innovation Solution
The electrosurgical system employs separate output signals for ablation and coagulation, allowing for simultaneous or sequential operation with individual electrical leads for each electrode, eliminating the need for reactive elements within the wand and enhancing energy control through adjustable voltage settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single RF energy output is used for both ablation and coagulation modes, then device complexity is reduced, but energy control precision deteriorates
Solution Approach 1:
The patent divides the single RF energy output into two separate output signals: a first output signal for ablation mode and a second output signal for coagulation mode. This segmentation allows each output to be independently controlled with specific voltage levels and waveforms optimized for its intended function, thereby improving energy control precision while maintaining relatively simple device architecture.
2Manufacturing precision
If reactive elements (inductors or capacitors) are added to the wand to achieve lower coagulation voltages, then energy control precision improves, but device complexity and cost increase
Solution Approach 1:
The patent extracts the voltage transformation function from the wand by placing a transformer in the controller circuitry. The transformer steps down the ablation voltage to produce the lower coagulation voltage, eliminating the need for reactive elements (inductors or capacitors) within the wand itself. This maintains voltage control precision while simplifying the wand structure and reducing costs.
3Manufacturing precision
If reactive elements are used in the wand to achieve lower coagulation voltages, then energy control precision improves, but manufacturing cost increases
Solution Approach 1:
The patent removes the expensive reactive elements from the wand and relocates the voltage transformation function to a transformer in the controller. This extraction eliminates the need for precision-tuned inductors or capacitors in the disposable wand, significantly reducing manufacturing costs while maintaining the ability to deliver precise coagulation voltages through the transformer's turns ratio.
4Manufacturing precision
If separate output signals are used for ablation and coagulation, then energy control precision improves, but device complexity increases
Solution Approach 1:
The patent merges the ablation and coagulation output signals through a common transformer primary winding. The controller switches between connecting the primary winding to either the ablation output or the coagulation output, allowing both functions to share the same transformer and much of the controller circuitry. This reduces device complexity compared to having completely separate power amplifiers for each mode.
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 enables precise control over energy delivery for both ablation and coagulation, reducing costs and improving the system's ability to handle various tissue types by eliminating the need for reactive elements in the wand, while allowing for flexible voltage adjustments.
Implementation Method 1
a transformer through which the RF energy moves. The transformer has a primary winding and a secondary winding
Data Source
AI summary
An electrosurgical controller with output RF energy control. At least some of the illustrative embodiments are electrosurgical controllers configured to change a first output voltage on the first active terminal relative to the first return terminal by selective control of a number of turns of the primary winding of a transformer used to create the output voltage.