Insulating Boot for Electrosurgical Forceps Stray Current
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Solution Overview
Problem
Existing electrosurgical forceps face challenges in minimizing stray current concentrations and facilitating insertion through small cannulas due to exposed conductive components, which can lead to tissue damage and procedural complications during endoscopic procedures.
Innovation Solution
An insulating boot is integrated onto the electrosurgical forceps, covering the pivot and shaft areas, and filled with silicone lube to reduce stray currents and facilitate insertion by providing a lubricating layer when the boot is removed, ensuring safe energy transfer and ease of cannula passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the jaw members and shaft are left exposed without insulation, then the electrosurgical forceps can effectively conduct energy to tissue, but stray current concentrations occur causing tissue damage and safety issues
Solution Approach 1:
An insulating boot made of electrically insulating material is introduced as an intermediary component between the conductive shaft/jaw members and the surrounding tissue environment. This boot covers the exterior surfaces of the shaft and jaw members, allowing controlled energy transfer to targeted tissue while preventing stray current concentrations that would cause damage to surrounding structures.
Solution Approach 2:
The insulating boot is constructed as a flexible shell that conforms to the exterior surfaces of the shaft and jaw members. This flexible insulating covering maintains the functional conductivity of the jaw members while providing continuous electrical insulation along the shaft, eliminating exposed conductive surfaces that could create harmful stray currents.
2Object-affected harmful factors
If an insulating boot is added to cover the shaft and jaw members, then stray current concentrations are reduced, but the device becomes more complex and harder to insert through small cannulas
Solution Approach 1:
The insulating boot is designed as a flexible, thin-walled shell that easily conforms to the existing shaft and jaw member geometry. This flexible construction avoids adding significant structural complexity while providing the necessary electrical insulation, and the flexibility facilitates insertion through small endoscopic cannulas.
Solution Approach 2:
The insulating boot serves multiple functions simultaneously: it provides electrical insulation to prevent stray currents, maintains a streamlined profile for easy insertion through cannulas, and protects the underlying conductive components. This multi-functionality reduces the need for additional separate components, thereby minimizing overall device complexity.
3Ease of operation
If the insulating boot is made with a smooth exterior, then insertion through cannulas is facilitated, but the boot may slip or become dislodged during use
Solution Approach 1:
The insulating boot is constructed as a flexible shell with an outer surface that is substantially smooth to facilitate easy insertion through endoscopic cannulas. The flexibility of the material allows the boot to conform and seal within the cannula opening, providing retention without requiring external fastening mechanisms that would compromise the smooth exterior surface.
Solution Approach 2:
The insulating boot is designed to create a uniform interface with the cannula wall through its flexible nature, distributing contact pressure evenly around the cannula opening. This even distribution of contact forces enhances retention and prevents slippage or dislodgement during use, while maintaining the smooth exterior surface for easy insertion.
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 insulating boot effectively reduces stray current concentrations, enhances safety by minimizing tissue damage, and facilitates the use of electrosurgical forceps in endoscopic procedures by allowing the safe sealing and coagulation of larger vessels without converting to open surgery.
Implementation Method 1
The insulative sheath houses a silicone lube configured to facilitate insertion of the forceps through a cannula after removal of the insulative sheath
Implementation Method 2
An insulating boot is integrated onto the electrosurgical forceps, covering the pivot and shaft areas, and filled with silicone lube to reduce stray currents
Data Source
AI summary
An electrosurgical forceps includes a shaft having a pair of jaw members at a distal end movable about a pivot from a first position disposed in spaced relation relative to one another to a second position wherein the jaw members are closer to one another for grasping tissue. One or both of the jaw members are adapted to connect to a source of electrical energy such that the jaw members are capable of conducting electrical energy to tissue held therebetween. An insulative sheath is fitted for removal atop at least a portion of an exterior surface of one or both jaw members, about the pivot and the distal end of the shaft. The insulative sheath houses a silicone lube configured to facilitate insertion of the forceps through a cannula after removal of the insulative sheath.