Transformer-Isolated Square-Wave Generator for Precise Electrosurgery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-frequency generators used in electrosurgery face challenges in accurately controlling and measuring voltage due to sinusoidal signals, leading to potential nerve stimulation and tissue carbonization, especially at higher frequencies where digital switching causes harmonics and inaccurate phase shift measurements.
Innovation Solution
A high-frequency generator that includes a transformer for galvanic isolation and a voltage conversion device to generate a high-frequency square-wave voltage from AC voltage, allowing for precise control and measurement, reducing harmonics and power losses, and preventing tissue carbonization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sinusoidal voltage is used in the primary circuit, then galvanic isolation and required voltage are achieved, but voltage measurement and control become inaccurate
Solution Approach 1:
The patent changes the voltage waveform parameter from sinusoidal to square wave. This transformation enables accurate voltage measurement and control because square wave voltage can be precisely measured using digital switching techniques, eliminating the measurement inaccuracies associated with sinusoidal voltage while maintaining galvanic isolation through the transformer
2Object-affected harmful factors
If high-frequency sinusoidal voltage is generated, then nerve stimulation is prevented, but harmonics and measurement inaccuracies increase
Solution Approach 1:
The patent changes the voltage waveform from sinusoidal to square wave at high frequencies. This eliminates harmonics generated by digital switching while maintaining the nerve-stimulation-preventing frequency characteristics. The square wave formulation allows for cleaner high-frequency operation without the harmonic distortion that plagues sinusoidal generation at these frequencies
3Reliability
If transformer is used for galvanic isolation, then safety requirements are met, but voltage measurement becomes difficult
Solution Approach 1:
The patent changes the voltage waveform to square wave, which can be accurately measured even through the galvanically isolated transformer. The square wave's sharp transitions and well-defined amplitude make it suitable for precise digital measurement, overcoming the measurement difficulties associated with transformed sinusoidal voltage while maintaining safety through galvanic isolation
4Productivity
If digital switching is used to generate high-frequency voltage, then performance is improved, but harmonics and switching losses increase
Solution Approach 1:
The patent changes the voltage waveform to square wave, which aligns perfectly with digital switching operation. This eliminates the need for complex sinusoidal waveform generation and reduces switching losses because the square wave can be generated with cleaner, more efficient digital switching. The formulation reduces harmonics and improves overall energy efficiency while maintaining high-frequency generation performance
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 solution enables improved tissue sealing and cutting with reduced nerve stimulation and carbonization, facilitating more precise control of power delivery and higher tissue sealing quality.
Implementation Method 1
a transformer (13) for coupling the primary circuit (11) to the secondary circuit (12) in a manner galvanically isolated from the secondary circuit
Implementation Method 2
a voltage conversion device (14) which is designed to generate a high-frequency square-wave voltage from the AC voltage transmitted from the primary circuit (11) to the secondary circuit (12) by means of the transformer
Implementation Method 3
a high-frequency alternating current is passed through a patient's human body in order to specifically damage or cut biological tissue in the body by causing heat
Implementation Method 4
Tissue sealing involves heating tissue using a high-frequency current
Data Source
AI summary
The invention relates to a high-frequency generator (10) comprising a primary circuit (11) to which an AC voltage can be applied, a secondary circuit (12), a transformer (13) for coupling the primary circuit to the secondary circuit in a manner galvanically isolated from the secondary circuit, and a voltage conversion device (14) which is designed to generate a high-frequency square-wave voltage from the AC voltage transmitted from the primary circuit to the secondary circuit by means of the transformer.