High-Frequency Surgical Device Switch Detection via Galvanic Isolation
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Solution Overview
Problem
High-frequency surgical devices face interference issues that make it difficult to unambiguously determine the actuation of activation switches, particularly at high voltages and currents, leading to potential erroneous activation.
Innovation Solution
A DC voltage source generates a control signal with a predetermined switching frequency in the application part, which is transmitted to the intermediary circuit, using opto-couplers or magneto-couplers, and is designed to be less susceptible to high-frequency signal interferences, with features like Zener diodes and resistors to ensure clear and reliable switching behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-frequency energy is used for cutting and coagulating, then surgical effectiveness is improved, but interference with activation switch detection increases
Solution Approach 1:
A coupling circuit is introduced as an intermediary between the high-frequency application part and the control circuit. This coupling circuit transfers the control signal from the application part to the control circuit while providing electrical isolation, thereby preventing high-frequency interference from reaching the activation switch detection circuitry.
Solution Approach 2:
The patent replaces direct electrical connection with a non-electrical signal transmission method using the coupling circuit. The control signal is transmitted through the coupling circuit which converts electrical signals to a form that can be transmitted without direct electrical contact, eliminating the interference path.
2Object-affected harmful factors
If galvanic separation is implemented between application part and intermediary circuit, then patient safety is improved, but signal transmission reliability deteriorates
Solution Approach 1:
The coupling circuit serves as an intermediary that enables signal transmission across the galvanic barrier. It receives the control signal from the application part, processes it, and transmits it to the control circuit without requiring direct electrical connection, thus maintaining galvanic isolation while ensuring reliable signal transmission.
Solution Approach 2:
The coupling circuit creates a replicated version of the control signal that can be transmitted to the control circuit. Instead of directly transmitting the original electrical signal across the galvanic barrier, the coupling circuit generates a corresponding signal copy that carries the same information without requiring electrical continuity.
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 provides clear identification of activation switch actuation, reduces interference susceptibility, and ensures safe and unambiguous switching, even at high voltages and currents, enhancing user and patient safety.
Implementation Method 1
using opto-couplers or magneto-couplers
Implementation Method 2
using opto-couplers or magneto-couplers
Implementation Method 3
with features like Zener diodes and resistors
Data Source
AI summary
The invention relates to a high-frequency surgical device for generating high-frequency energy for cutting and/or coagulating biological tissue. The high-frequency surgical device comprises an application part being electrically connectable to an electrosurgical instrument having at least one activation switch, an intermediary power circuit galvanically separated from the application part, a DC power source which, in operation, provides in the application part at least one DC voltage, a with the DC voltage source electrically connected control signal generator which, in operation, generates in the application part (10) from the DC voltage an alternating control signal with a predetermined switching frequency, and a to the control signal generator electrically connected evaluation unit being electrically connectable to the activation switch of the instrument and which, when the activation switch is actuated, transmits a with the switching frequency oscillating activation signal to the input power circuit.