Generator Leakage Current Control via Transformer Segmentation
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Solution Overview
Problem
Existing generators used in medical treatment instruments face challenges in preventing excessive leakage current to patients during malfunctions, which can be harmful and require strict adjustments to maintain safety standards.
Innovation Solution
The generator incorporates a transformer unit with specific configurations of inductors and capacitors to ensure that the potential of the secondary coil connected to the patient remains below a predetermined value, using a PLL control system and a constant current control system to manage energy delivery effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transformer unit with multiple inductors and capacitors is configured to minimize leakage current, then patient safety is improved, but device complexity increases
Solution Approach 1:
The transformer unit is divided into multiple independent inductor components (first inductor, second inductor, third inductor) with specific winding configurations. Each inductor can be independently designed and adjusted to control leakage current paths, allowing the system to achieve safety standards while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent specifies precise parameter adjustments for the inductors (winding ratios, turns counts) and capacitors to achieve the desired leakage current characteristics. By carefully selecting and adjusting these parameters, the system minimizes leakage current to safe levels while maintaining the necessary power transmission functionality.
2Object-affected harmful factors
If the potential of the secondary coil is controlled to remain below a predetermined value, then leakage current is minimized, but manufacturing precision requirements increase
Solution Approach 1:
The transformer unit is designed with pre-calculated inductor and capacitor parameters that are determined during the design phase to ensure leakage current remains below the predetermined threshold. This preliminary configuration allows the system to meet safety standards without requiring extremely tight manufacturing tolerances during production.
Solution Approach 2:
The patent provides specific parameter ranges and adjustment methods for the inductors and capacitors that balance manufacturing feasibility with safety requirements. By establishing appropriate parameter specifications, the system achieves leakage current control without imposing impractically high manufacturing precision requirements.
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 configuration effectively minimizes leakage current to safe levels, ensuring patient safety while maintaining high vibration energy for effective tissue treatment, adhering to standards like IEC 60601-1.
Implementation Method 1
The generator includes a transformer unit comprising a primary coil and a secondary coil. The primary coil and the secondary coil are wound around a core, respectively.
Implementation Method 2
A capacitor is connected between the third contact and ground. An inductance of the third inductor and a capacitance of the capacitor are adjusted in such a manner that a potential of the second contact is equal to or less than a predetermined value.
Data Source
AI summary
A generator includes first, second, and third inductors and a capacitor. The first inductor is formed by a primary coil of a transformer. The second inductor is formed by a first secondary coil of the transformer. The second inductor is connected between a first contact and a second contact. The first and the second contacts are connected to a surgical instrument. The third inductor is formed by a second secondary coil of the transformer continuously connected to the first secondary coil. The third inductor is connected between the second contact and a third contact. A polarity of the second contact with respect to the third contact coincides with a polarity of the first contact with respect to the second contact of the second inductor. The capacitor is connected between the third contact and ground. An inductance of the third inductor and a capacitance of the capacitor are adjusted.