Dielectric Coating for Electrosurgical Stapler Electrodes
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Solution Overview
Problem
Existing electrosurgical instruments face challenges with shorts caused by metallic staples during RF energy application, leading to increased operating room time and potential surface charge issues with plastic cartridges.
Innovation Solution
The use of a dielectric coating on the electrosurgical instrument's electrodes and staple cartridges to prevent direct contact with electrically active areas, redirecting RF energy flow and reducing surface charge, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallic staples are used in electrosurgical instruments, then hemostasis and tissue sealing are improved, but shorting between electrodes occurs during RF energy application
Solution Approach 1:
A dielectric coating is applied to the metallic staples to act as an electrical insulator. This intermediary layer prevents direct electrical contact between the conductive staple and the RF energy path, thereby eliminating shorting while preserving the staple's mechanical hemostatic function. The dielectric material allows the staple to maintain its structural role in tissue approximation and compression without conducting electrical current.
Solution Approach 2:
The electrical conductivity parameter of the staple is modified by applying a dielectric coating. This changes the electrical properties of the staple from conductive to insulating, allowing it to function in the RF energy field without causing shorting. The coating thickness and material properties are optimized to provide sufficient electrical insulation while maintaining the staple's mechanical integrity and tissue-sealing capability.
2Device complexity
If plastic cartridges are used to hold staples, then device complexity is reduced, but surface charge formation occurs during RF energy application
Solution Approach 1:
A dielectric coating is applied to the plastic cartridge surface to serve as an intermediary layer that prevents charge accumulation. This coating layer allows the RF energy to pass through or along the cartridge without causing electrostatic charge buildup on the plastic surface, thereby eliminating the harmful surface charge effect while maintaining the cartridge's structural simplicity.
Solution Approach 2:
The surface electrical properties of the plastic cartridge are modified by applying a dielectric coating with optimized permittivity and thickness parameters. This changes the surface charge characteristics of the plastic material, preventing triboelectric or capacitive charge accumulation during RF energy application while preserving the cartridge's mechanical function of holding and deploying staples.
3Reliability
If dielectric coating is applied to prevent shorting, then electrical reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The dielectric coating is applied as a thin, conformal layer that can be manufactured using cost-effective coating techniques such as plasma spraying, chemical vapor deposition, or dip-coating. These methods allow for automated application of the dielectric material to staples and cartridges, making the additional manufacturing step economically viable. The coating process is designed to be integrated into existing manufacturing workflows, minimizing disruption and cost increase.
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 minimizes shorting issues and surface charge formation, enhancing the efficiency of electrosurgical procedures by maintaining consistent energy delivery and reducing the risk of electrical interference, thereby decreasing operating room time and improving hemostasis.
Implementation Method 1
A dielectric coating can be placed on at least one of the first and second pole electrodes, the dielectric having least one open channel through the dielectric coating. The at least one open channel in the dielectric coating may provide passage of radio frequency energy between the first and second pole electrodes.
Implementation Method 2
The staple cartridge can have a coating to reduce formation of a surface charge thereon during the application of bipolar energy to tissue.
Data Source
AI summary
An electrosurgical stapling instrument includes an end effector capable of applying bipolar RF energy into tissue. The end effector has a first pole electrode and a second pole electrode for forming an RF contact circuit with tissue. At least one of the electrodes may have a dielectric coating thereon to create a RF circuit with tissue. The dielectric coating can cover one of the electrodes to create a capacitive coupling circuit with tissue, or can have at least one open passageway extending through the dielectric coating to enable tissue contact with the electrode and the passage of RF energy therethrough. The dielectric coating on the electrode can be masked to create passageways through the dielectric, or the dielectric coating can be locally removed with a variety of techniques to form passageways. The dielectric coating may provide a barrier to prevent shorting between the dielectrically coated electrode and a conductive fastener embedded within tissue. Alternately, a cartridge coating can be used to reduce an electric surface sheet charge on the cartridge thermoplastic that can occur during the application of RF energy to tissue.