HF Surgery Generator Feedback Discharge Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
HF surgical generators face challenges in achieving precise and efficient control of the coagulation zone depth and efficiency, particularly due to low efficiency in forming short pulses and energy dissipation, which requires complex cooling measures and limits their performance in the operating room.
Innovation Solution
An HF surgical generator with a power pack, controllable switching device, and feedback mechanism that temporarily discharges energy from the output transformer into a storage capacitor, allowing for quick reduction of the HF output signal and increasing efficiency by reusing stored energy, along with a discharge device to convert residual energy into heat, ensuring reliable oscillation and improved signal controllability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional DC voltage supply operates in two operating modes with energy transfer back to input, then efficiency is improved, but significant improvements in formation of short pulses cannot be achieved
Solution Approach 1:
The patent divides the energy management into two distinct circuits: a feedback circuit for energy recovery to the DC supply, and a separate discharge circuit for rapid pulse termination. This segmentation allows the feedback circuit to improve efficiency while the discharge circuit enables fast pulse formation and termination without interfering with the energy recovery process.
Solution Approach 2:
The patent introduces a discharge circuit with a discharge switch and discharge resistor as an intermediary mechanism between the energy store and ground. This intermediary allows rapid dissipation of stored energy when pulse termination is needed, enabling short pulse formation without compromising the efficiency improvements from the feedback circuit.
2Ease of operation
If HF output signal is terminated by withdrawing energy through ohmic resistor in parallel with load, then signal termination is achieved, but efficiency is low
Solution Approach 1:
The patent extracts the energy termination function from the load circuit by introducing a separate discharge circuit with a discharge switch. When termination is needed, the discharge switch connects the energy store directly to ground through a discharge resistor, bypassing the load and enabling rapid energy withdrawal without affecting the main operational efficiency.
Solution Approach 2:
The discharge circuit is pre-configured and ready to act immediately when pulse termination is required. The discharge switch can be activated to rapidly connect the energy store to ground, ensuring fast signal termination before the energy is dissipated, thus maintaining operational efficiency.
3Loss of energy
If complex cooling measures are implemented to eliminate heat losses, then heat loss elimination is achieved, but device complexity increases
Solution Approach 1:
The patent converts the harmful heat losses into beneficial reused energy through the feedback circuit. The feedback circuit captures energy that would otherwise be lost and returns it to the DC voltage supply, transforming waste heat into useful energy and reducing the need for cooling measures without adding complex cooling systems.
4Measurement precision
If amplitude-modulated HF voltages with single oscillation period are used, then coagulation zone depth control is improved, but energy efficiency decreases
Solution Approach 1:
The patent ensures continuity of useful action by implementing a feedback circuit that continuously recovers energy from the energy store and returns it to the DC supply during both active and idle periods. This continuous energy recovery maintains high efficiency even when the HF output is terminated or during single oscillation periods, preventing energy waste while preserving precise coagulation control.
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 solution enhances the efficiency and controllability of the HF output signal, reducing heat losses and simplifying cooling requirements, while allowing for precise adjustment of voltage ratios and efficient energy regeneration.
Implementation Method 1
a feedback device between the energy store and the storage capacitor... the energy store is at least partially discharged into the storage capacitor
Implementation Method 2
conversion into heat by means of an ohmic load
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
In order to be able to abruptly terminate the output signal of an HF surgery generator, ohmic loads have been previously used. The invention relates to an HF surgery generator having a power supply having at least one storage capacitor, a controllable switching device having at least one energy store, such as a transformer, by means of which an HF output signal that can be fed to an HF surgery instrument is generated, wherein a feedback device is provided between the energy store and the storage capacitor and a controller is further used, controlling the switching device and the feedback device such that whenever the HF output signal is to be terminated, the feedback device allows current flow at least part of the time and the energy store in the storage capacitor is at least partially discharged.