Electrophoretic Coating for Surgical Applicators
Solution Overview
Problem
Current methods for applying electrically insulating plastics to surgical instruments and nerve stimulation needles for high-frequency surgery are complex and often result in non-reproducible coating thicknesses, leading to unnecessary thick layers that do not meet specific dielectric strength requirements.
Innovation Solution
The method involves electrophoretic deposition of electrically insulating plastics from a suspension in an organic solvent, allowing for precise control of coating thickness and achieving dielectric strengths of at least 500 V/mm, with preferred thicknesses between 5 μm and 500 μm, using thermoplastic materials like polyamides and fluoroplastics, and optionally incorporating primer and coloring layers for improved adhesion and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electrically insulating plastics are deposited using electrostatic or fluidized-bed sintering, then coating can be applied to surgical instruments, but the coating thickness cannot be precisely controlled and dielectric strength requirements cannot be met
Solution Approach 1:
The patent changes the deposition method from electrostatic or fluidized-bed sintering to electrophoretic deposition, which allows precise control of coating thickness through parameter adjustment (deposition time, voltage, suspension concentration). This enables achieving specific dielectric strength values with optimized layer thicknesses while maintaining manufacturing feasibility
Solution Approach 2:
The patent replaces the mechanical/thermal deposition processes (electrostatic deposition, fluidized-bed sintering) with an electrical field-based process (electrophoretic deposition). This substitution enables better control over coating thickness and dielectric properties through electrical parameter control rather than mechanical or thermal parameters
2Reliability
If thicker insulating plastic layers are deposited to ensure dielectric strength, then safety is improved, but layer thickness exceeds what is actually necessary according to product specifications
Solution Approach 1:
The electrophoretic deposition process provides feedback control through measurable parameters (deposition time, voltage, current, suspension concentration) that directly correlate with coating thickness and dielectric strength. This allows optimization of layer thickness to meet exactly the required dielectric strength without excessive thickness
Solution Approach 2:
By changing to electrophoretic deposition, the patent enables independent control of coating thickness through electrical parameters, allowing the coating to be precisely tuned to meet dielectric strength requirements without applying unnecessarily thick layers
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 approach enables the application of electrically insulating coatings with optimized thickness and dielectric strength, ensuring safety and effectiveness in surgical applications while maintaining the integrity and visibility of the instruments.
Implementation Method 1
The method involves electrophoretic deposition of electrically insulating plastics from a suspension in an organic solvent, allowing for precise control of coating thickness and achieving dielectric strengths of at least 500 V/mm
Data Source
AI summary
In a method for applying at least one coating composed of at least one electrically insulating plastic to an applicator for currents, in particular HF currents, in surgery, the coating is generated by electrophoretic deposition from a suspension of the plastic in at least one organic solvent. The applicators coated in this way are in particular clamps, forceps or scissors, which are used in the bipolar technique of HF surgery. The plastics used are, in particular, thermoplastics, for example thermoplastic fluoroplastics. These are, in particular, polychlorotrifluoroethylene (PCTFE) or ethylene chlorotrifluoroethylene (ECTFE).