Active Electrosurgical Instrument With Integrated High-Frequency Generator
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Solution Overview
Problem
Existing electrosurgical instruments require external generators to supply high-frequency power, leading to electromagnetic interference and complexity, and often necessitate shielded cables, which are less flexible and prone to radiation issues.
Innovation Solution
An electrosurgical instrument with a self-oscillating high-frequency generator integrated within the instrument, using a push-pull oscillator powered by DC or low-frequency AC, eliminating the need for external power transmission and reducing electromagnetic interference by generating power close to the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an external generator is used to supply high-frequency power to the instrument, then the instrument can perform electrosurgical procedures, but electromagnetic interference occurs and the system becomes complex
Solution Approach 1:
The patent integrates the high-frequency generator directly into the electrosurgical instrument, merging previously separate components (external generator and instrument) into a single unified device. This eliminates the need for complex external connections and reduces overall system complexity while maintaining full electrosurgical functionality.
Solution Approach 2:
The patent introduces a cable with integrated high-frequency generator as an intermediary component between the power source and the instrument. This intermediary contains the high-frequency generation capability, eliminating the need for complex external generators and reducing electromagnetic interference at the instrument level.
2Object-affected harmful factors
If shielded cables are used to transmit high-frequency power, then electromagnetic interference is reduced, but the cables become less flexible and prone to radiation issues
Solution Approach 1:
The patent extracts the high-frequency generation function from the cable system and places it directly in the instrument. This eliminates the need for shielded cables entirely, as high-frequency power is generated locally at the instrument rather than being transmitted through cables, thereby maintaining cable flexibility while avoiding electromagnetic interference issues.
Solution Approach 2:
The patent replaces the mechanical shielded cable system with an integrated high-frequency generator in the instrument. Instead of using physical shielding to block electromagnetic interference, the system generates high-frequency power directly at the point of use, eliminating the need for shielded transmission paths and associated flexibility constraints.
3Use of energy by moving object
If external generators are required, then power can be supplied to the instrument, but the instrument requires complex control systems and external connections
Solution Approach 1:
The patent combines the power supply and control functions directly into the instrument by integrating the high-frequency generator within the instrument housing. This eliminates the need for external generators and complex external control systems, as all power generation and control functions are now self-contained within the instrument itself.
Solution Approach 2:
The instrument becomes self-sufficient by incorporating its own high-frequency generator, eliminating dependence on external power sources and control systems. The integrated generator provides all necessary power and control functions internally, allowing the instrument to operate independently without complex external connections or control infrastructure.
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 minimizes electromagnetic interference, allows for flexible unshielded cables, and simplifies the instrument design by eliminating the need for external generators and complex control systems, while maintaining precise surgical control.
Implementation Method 1
DE 20 23 140 A1 discloses an electrosurgical device for powering an instrument. The electrosurgical device has a push-pull oscillator for generating the high-frequency voltage required to operate the instrument.
Implementation Method 2
The frequency of the current provided to operate such instruments is typically a few hundred kHz. Such instruments operate with a high-frequency current flow through the tissue and always require two electrodes applied to the tissue. The instruments are used to perform various procedures that require the direct flow of current through the biological tissue, such as cutting, coagulation, fusing, ablation, and the like.
Implementation Method 3
A high-frequency generator, designed as a self-oscillating oscillator, is arranged on or in the instrument. The high-frequency generator generates the electrical power required for the surgical procedure.
Data Source
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AI summary
The electrosurgical instrument (11) according to the invention has at least one electrode (15, 16) for electrically influencing biological tissue. The electrode is coupled to a high-frequency generator (20) which is arranged in the immediate vicinity of the electrode (15) and/or (16). The high-frequency generator oscillates autonomously at a frequency between 100 kHz and 10 MHz and is preferably powered by a constant or a time-varying DC voltage. The instrument (11) is thus connected to a power source, for example a device (19), via a low-frequency or DC-carrying line.