Flexible Insulating Boot for Electrosurgical Forceps
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Solution Overview
Problem
Existing electrosurgical forceps lack effective insulation around pivot elements and conductive shafts, leading to potential stray electrical energy conduction to patients during procedures, particularly in endoscopic surgeries where smaller cannulas pose design challenges.
Innovation Solution
A flexible insulating boot with a free-flowing material, such as an adhesive, insulating, or lubricating material, is applied to the exterior surfaces of jaw members and around the pivot, creating a cavity that disperses upon energy application to reduce stray current concentrations and enhance tissue sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the jaw members and shaft are left exposed or covered with inflexible shrink-tube, then the structure is simple and easy to manufacture, but stray electrical energy can conduct to the patient creating safety hazards
Solution Approach 1:
The patent applies a flexible insulating boot made of elastomeric material that covers the jaw members and pivot elements. This flexible shell provides electrical insulation while accommodating the movement and flexing of the forceps components, thereby preventing stray current conduction to the patient without requiring a complex rigid insulation structure.
Solution Approach 2:
The insulating boot acts as an intermediary barrier between the conductive jaw members/shaft and the patient tissue. This intermediate insulating layer blocks the path of stray electrical energy while allowing the mechanical function of the forceps to operate normally, thus resolving the safety issue without compromising device functionality.
2Reliability
If a rigid insulation covering is applied to the jaw members and shaft, then electrical insulation is improved, but the flexibility and range of motion of the forceps are reduced
Solution Approach 1:
The patent specifically uses a flexible elastomeric boot that can deform and flex with the movement of the jaw members. This flexible insulation material maintains electrical isolation while accommodating the dynamic motion required for surgical operations, unlike rigid insulation that would restrict movement and compromise ease of operation.
Solution Approach 2:
The insulating boot is designed to be dynamic rather than static - it flexes, stretches, and deforms along with the jaw members during opening and closing motions. This dynamic design ensures that the insulation remains effective throughout the range of motion while preserving the operational flexibility needed for successful tissue sealing procedures.
3Reliability
If the insulating boot is made from rigid material, then electrical insulation is enhanced, but the boot cannot accommodate the flexing and movement of the jaw members
Solution Approach 1:
The patent employs a flexible elastomeric material for the insulating boot that inherently adapts to the movement and flexing of the jaw members. This material property allows the boot to maintain its insulating function while dynamically conforming to the changing geometry and position of the underlying mechanical components during operation.
Solution Approach 2:
The insulating boot material is selected with specific physical parameters - it has sufficient electrical resistance to block stray currents while having adequate flexibility and elasticity to accommodate the mechanical deformation of the jaw members. The material's ability to change its physical state or deformation characteristics under stress allows it to satisfy both insulation and adaptability requirements simultaneously.
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, allowing for safer and more efficient tissue sealing and coagulation, enabling the use of electrosurgical forceps in smaller cannulas without exposing patients to electrical hazards.
Implementation Method 1
A flexible insulating boot with a free-flowing material, such as an adhesive, insulating, or lubricating material, is applied to the exterior surfaces of jaw members and around the pivot, creating a cavity that disperses upon energy application to reduce stray current concentrations
Implementation Method 2
The flexible insulating boot includes an internal cavity defined therein that retains a free-flowing material therein configured to disperse from the internal cavity when ruptured
Data Source
AI summary
An electrosurgical forceps includes a shaft having a pair of jaw members at a distal end thereof that are movable about a pivot from a first position wherein the jaw members are disposed in spaced relation relative to one another to a second position wherein the jaw members are closer to one another for grasping tissue. A movable handle is included that actuates a drive assembly to move the jaw members relative to one another. One or both of the jaw members is adapted to connect to a source of electrical energy to conduct energy to tissue held therebetween. A flexible insulating boot is disposed on at least a portion of an exterior surface of one or both jaw members and about the pivot. The flexible insulating boot includes an internal cavity defined therein that retains a free-flowing material therein configured to disperse from the internal cavity when ruptured.