Surgical Tool Power Console With Matched Current Transformer
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Solution Overview
Problem
Existing powered surgical tool systems face challenges in minimizing leakage current, particularly in ultrasonic handpieces, due to parasitic capacitances, which can lead to unsafe current flows through patients.
Innovation Solution
The power console incorporates a transformer with a self-contained matched current source, comprising a leakage control winding and a capacitor, to produce a current that cancels out parasitic current, thereby reducing leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a handpiece includes a power generating unit with AC drive signals, then the surgical tool can perform its therapeutic function, but parasitic current flows through metal structural components due to parasitic capacitance
Solution Approach 1:
The patent measures the parasitic current flowing through metal structural components and feeds back a compensating current through the matched current source. This converts the harmful parasitic current into a measurable parameter that can be compensated, transforming the problem into a solution where the harmful effect is quantified and neutralized.
Solution Approach 2:
The patent employs a feedback mechanism where the parasitic current is measured and a compensating signal is generated and applied through the matched current source. This closed-loop feedback system continuously monitors and corrects the parasitic current, ensuring it remains below safety thresholds while maintaining therapeutic functionality.
2Object-affected harmful factors
If leakage current is reduced to safe levels, then patient safety is improved, but device complexity increases due to additional current control components
Solution Approach 1:
The patent combines the matched current source, its winding, and the capacitor into an integrated assembly that is coupled with the transformer. This merging of components reduces overall device complexity by eliminating the need for separate leakage control circuits while maintaining the ability to reduce leakage current to safe levels.
Solution Approach 2:
The matched current source serves multiple functions: it generates the compensating current to offset parasitic current, works in conjunction with the transformer for power generation, and integrates with existing handpiece components. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity.
3Object-generated harmful factors
If a matched current source is added to reduce parasitic current, then leakage current is minimized, but device complexity and component count increase
Solution Approach 1:
The matched current source assembly is integrated with the transformer, combining multiple functions into a single coupled assembly. This integration reduces the overall component count by eliminating separate mounting and connection requirements for standalone leakage control components.
Solution Approach 2:
The matched current source automatically generates the compensating current based on the measured parasitic current without requiring external control circuits or additional components. This self-service capability reduces device complexity by eliminating the need for separate control systems while maintaining effective leakage current minimization.
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 effectively minimizes leakage current to safe levels, ensuring patient safety and maintaining the efficiency of the surgical tool system by reducing mechanical damping.
Implementation Method 1
The power console includes a transformer with an internal matched current source. This current source produces a current matched to the parasitic current to minimize the leakage current.
Data Source
AI summary
Control console for a powered surgical tool that includes a transformer with a secondary winding across which the tool drive signal is present. Also internal to the transformer is a matched current source that consists of a leakage control winding and a capacitor. The current sourced by the matched current at least partially cancels out leakage current that may be present.